Qt Quick Examples - Text
Text is a collection of small QML examples relating to text. Each example is a small QML file, usually containing or emphasizing a particular type or feature. You can run and observe the behavior of each example.
Hello
Hello shows how to change and animate the letter spacing of a Text type. It uses a sequential animation to first animate the font.letterSpacing property from 0
to 50
over three seconds and then move the text to a random position on screen:
SequentialAnimation on font.letterSpacing { loops: Animation.Infinite; NumberAnimation { from: 0; to: 50; easing.type: Easing.InQuad; duration: 3000 } ScriptAction { script: { container.y = (screen.height / 4) + (Math.random() * screen.height / 2) container.x = (screen.width / 4) + (Math.random() * screen.width / 2) } } }
Fonts
Fonts shows different ways of using fonts with the Text type. Simply by name, using the font.family property directly:
font.family: "Times"
or using a FontLoader type:
FontLoader { id: fixedFont; name: "Courier" }
or using a FontLoader and specifying a local font file:
FontLoader { id: localFont; source: "content/fonts/tarzeau_ocr_a.ttf" }
or finally using a FontLoader and specifying a remote font file:
FontLoader { id: webFont; source: "http://www.princexml.com/fonts/steffmann/Starburst.ttf" }
Available Fonts
Available Fonts shows how to use the Qt global object and a list view to display all the fonts available on the system. The ListView type uses the list of fonts available as its model:
model: Qt.fontFamilies()
Inside the delegate, the font family is set with the modelData:
font.family: modelData
Banner
Banner is a simple example showing how to create a banner using a row of text types and a NumberAnimation.
Img Tag
Img tag shows different ways of displaying images in text objects using the <img>
tag.
Text Layout
Text Layout shows how to create a more complex layout for a text item. This example lays out the text in two columns using the onLineLaidOut handler that allows you to position and resize each line:
onLineLaidOut: { line.width = width / 2 - (margin) if (line.y + line.height >= height) { line.y -= height - margin line.x = width / 2 + margin } }
Files:


Databases, SQL, and Sequelize (Week 10) - Learning Objectives
Assessment Structure
- 2 hours, 55 minutes
- Mixture of multiple choice (5-10), free response (1-3) and VSCode problems (40ish specs).
- Free response just requires enough detail to answer the question, 1-3 sentences. As long as you are able to explain the concept and answer all aspects that it asks, you are good.
- Coding problems come in two varieties:
- Writing raw SQL like the projects from Tuesday to create tables, insert values, query for records, join tables for queries, etc.
- Using sequelize to perform actions such as creating migrations, models, seeders, and then interacting with those models to query for, create, modify, delete, etc.
- Both of these sections have their own practice assessment
- Standard assessment procedures
- You will be in an individual breakout room
- Use a single monitor and share your screen
- Only have open those resources needed to complete the assessment:
- Zoom
- VSCode
- Browser with AAO and Progress Tracker (to ask questions)
- Approved Resources for this assessment:
- Postgres Docs: https://www.postgresql.org/docs/
- Sequelize Docs: https://sequelize.org/
- Sequelize “Cheatsheet”
Portfolio Quality, RDBMS and Database Entitities (W10D1) - Learning Objectives
Portfolio Quality (Not directly assessed)
- Recall the items recruiters are most interested in
- Explain aspects of a good looking Web application
- Identify App Academy’s expectations of your projects for after you graduate
- Practice good code hygiene when making projects live
RDBMS and Database Entities
- Define what a relational database management system is
- Describe what relational data is
- Define what a database is
- Define what a database table is
- Describe the purpose of a primary key
- Describe the purpose of a foreign key
- Describe how to properly name things in PostgreSQL
- Install and configure PostgreSQL 12, its client tools, and a GUI client for it named Postbird
- Connect to an instance of PostgreSQL with the command line tool psql
- Identify whether a user is a normal user or a superuser by the prompt in the psql shell
- Create a user for the relational database management system
- Create a database in the database management system
- Configure a database so that only the owner (and superusers) can connect to it
- View a list of databases in an installation of PostgreSQL
- Create tables in a database
- View a list of tables in a database
- Identify and describe the common data types used in PostgreSQL
- Describe the purpose of the UNIQUE and NOT NULL constraints, and create columns in database tables that have them
- Create a primary key for a table
- Create foreign key constraints to relate tables
- Explain that SQL is not case sensitive for its keywords but is for its entity names
SQL (W10D2) - Learning Objectives
SQL
- How to use the
SELECT ... FROM ...
statement to select data from a single table
- How to use the
WHERE
clause on SELECT
, UPDATE
, and DELETE
statements to narrow the scope of the command
- How to use the
JOIN
keyword to join two (or more) tables together into a single virtual table
- How to use the
INSERT
statement to insert data into a table
- How to use an
UPDATE
statement to update data in a table
- How to use a
DELETE
statement to remove data from a table
- How to use a seed file to populate data in a database
SQL (continued) (W10D3) - Learning Objectives
SQL (continued)
- How to perform relational database design
- How to use transactions to group multiple SQL commands into one succeed or fail operation
- How to apply indexes to tables to improve performance
- Explain what and why someone would use EXPLAIN
- Demonstrate how to install and use the node-postgres library and its Pool class to query a PostgreSQL-managed database
- Explain how to write prepared statements with placeholders for parameters of the form “$1”, “$2”, and so on
ORM (W10D4) - Learning Objectives
ORM
- How to install, configure, and use Sequelize, an ORM for JavaScript
- How to use database migrations to make your database grow with your application in a source-control enabled way
- How to perform CRUD operations with Sequelize
- How to query using Sequelize
- How to perform data validations with Sequelize
- How to use transactions with Sequelize


Free as in FreedomRichard Stallman's Crusade for Free SoftwareBy Sam WilliamsMarch 2002 0-596-00287-4, Order Number: 2874 240 pages, $22.95 US $34.95 CA |
Table of Contents
PrefaceChapter 1: For Want of a Printer
Chapter 2: 2001: A Hacker's Odyssey
Chapter 3: A Portrait of the Hacker as a Young Man
Chapter 5: Small Puddle of Freedom
Chapter 7: A Stark Moral Choice
Chapter 9: The GNU General Public License
Chapter 12: A Brief Journey Through Hacker Hell
Chapter 13: Continuing the Fight
Chapter 14: Epilogue: Crushing Loneliness
© 2001, O'Reilly & Associates, Inc.
webmaster@oreilly.com


{% extends "email_alert_base.html" %} {% block primary_text_1 %} Your driving prohibition {{ prohibition_number }} isn't in our system so your online application for review can't go ahead. {% endblock %} {% block primary_text_2 %} Apply in-person for a review by:
{% endblock %} {% block primary_3 %}{% endblock %} {% block primary_4 %}{% endblock %} {% block callout %}You must apply in-person within 7 days from the date of issue.{% endblock %} {% block timeline %}timeline.png{% endblock %} {% block email_not_monitored %}{% include 'partials/call_appeals_registry.html' %}{% endblock %}


| periodReturn {quantmod} | R Documentation |
Given a set of prices, return periodic returns.
periodReturn(x, period='monthly', subset=NULL, type='arithmetic', leading=TRUE, ...) dailyReturn(x, subset=NULL, type='arithmetic', leading=TRUE, ...) weeklyReturn(x, subset=NULL, type='arithmetic', leading=TRUE, ...) monthlyReturn(x, subset=NULL, type='arithmetic', leading=TRUE, ...) quarterlyReturn(x, subset=NULL, type='arithmetic', leading=TRUE, ...) annualReturn(x, subset=NULL, type='arithmetic', leading=TRUE, ...) yearlyReturn(x, subset=NULL, type='arithmetic', leading=TRUE, ...) allReturns(x, subset=NULL, type='arithmetic', leading=TRUE)
x |
object of state prices, or an OHLC type object |
period |
character string indicating time period. Valid entries are ‘daily’, ‘weekly’, ‘monthly’, ‘quarterly’, ‘yearly’. All are accessible from wrapper functions described below. Defaults to monthly returns (same as monthlyReturn) |
subset |
an xts/ISO8601 style subset string |
type |
type of returns: arithmetic (discrete) or log (continuous) |
leading |
should incomplete leading period returns be returned |
... |
passed along to to.period |
periodReturn
is the underlying function for wrappers:
allReturns:
calculate all available return periods
dailyReturn:
calculate daily returns
weeklyReturn:
calculate weekly returns
monthlyReturn:
calculate monthly returns
quarterlyReturn:
calculate quarterly returns
annualReturn:
calculate annual returns
Returns object of the class that was originally passed in,
with the possible exception of monthly and quarterly return
indicies being changed to class yearmon
and yearqtr
where available. This can be overridden with the indexAt
argument passed in the ... to the to.period
function.
By default, if subset
is NULL, the full dataset will
be used.
Attempts are made to re-convert the resultant series to its original
class, if supported by the xts package. At present, objects inheriting
from the ‘ts’ class are returned as xts
objects. This
is to make the results more visually appealling and informative. All
xts
objects can be converted to class ts
with
as.ts
if that is desirable.
The first and final row of returned object will have the period return to last date,
i.e. this week/month/quarter/year return to date even if the start/end is not the start/end
of the period. Leading period calculations can be suppressed by setting leading=FALSE
.
Jeffrey A. Ryan
## Not run: getSymbols('QQQQ',src='yahoo') allReturns(QQQQ) # returns all periods periodReturn(QQQQ,period='yearly',subset='2003::') # returns years 2003 to present periodReturn(QQQQ,period='yearly',subset='2003') # returns year 2003 rm(QQQQ) ## End(Not run)


Component-based software engineering (CBSE), also called components-based development (CBD), is a branch of software engineering that emphasizes the separation of concerns with respect to the wide-ranging functionality available throughout a given software system. It is a reuse-based approach to defining, implementing and composing loosely coupled independent components into systems.
Using Content Delivery Network

Single page application components
/**Create a new folder and run the command below to create a scaffolded react app**/
npm install -g create-react-app
/**Run command to create a react app called example_react_app**/
npx create-react-app example_react_app
/**Navigate into the example_react_app by running the command below**/
cd example_react_app
/**Run the command below to start the server**/
npm start
React was created by Facebook, it is an open-source JavaScript library for building user interfaces. It is used to create components, handle state and props, utilize event listeners and certain life cycle methods to update data as it changes.
Components
are independent and reusable bits of code. They serve the same purpose as JavaScript functions, but work in isolation and returns HTML via a render function. Components come in two types, Class components and Function components.
Props and State
Props are arguments passed into React components. Props are passed to components via HTML attributes.
State
React components have a built-in state object. The state object is where you store property values that belongs to the component. When the state object changes, the component re-renders.
Event Listeners
React can perform actions based on user events. React has the same events as HTML: click, change, mouseover etc.
Class Component ⛄ Function Component
import React, { Component } from "react";
class Welcome extends Component {
state = {};
render() {
return
 Hello {this.props.name}
;
}
}
export default Welcome;
function Car() {
return
Hi, I am also a Car!
;
}
JSX is a syntax that gets compiled into valid JavaScript ★ JSX converts HTML tags into react elements ★ You do not have to use JSX, but it's easier to use JSX with React.
function formatName(user) {
return user.firstName + ' ' + user.lastName;
}
const user = {
firstName: 'Silas',
lastName: 'Alexander'
};
const element = (

Hello, {formatName(user)}!

);
ReactDOM.render(element, document.getElementById('root'));
var tested = true;
var innerText = 'Offers';
var offerReactNode =

{innerText}

;
ReactDOM.render(offerReactNode, document.getElementById('offers'));
Attributes
When we want to add custom attribute, we need to use data- prefix. ★ Whenever using the class attribute, we need to use className instead.
Expressions
JavaScript expressions can be used inside of JSX. We just need to wrap it with curly brackets {}.
var styles = {backgroundColor:'#cd0000'};
var innerText = 'Suggestions';
var suggestionReactNode = (

{innerText}

{//Line Comment}
{/*Block Comment...*/}

;)
ReactDOM.render(suggestionReactNode, document.getElementById('suggest'));
Nested Elements
★ If we want to return more elements, we need to wrap it with one container element
★ To write JSX on multiple lines, wrap in parentheses
CSS Style
★ React recommends using inline styles.
★ To set inline CSS properties, we need to use camelCase syntax.
Comments
When writing comments, we need to put curly brackets {} when we want to write comment within children section of a tag.
Step 1
Create a React environment (refer to previous slides) | Navigate to this github repository and copy the img folder and profile.html code into environment file.
Step 2
Create three [offers, suggestions, task] class components
Step 3
Add JSX components to page
Mounting
the process of outputting the virtual representation of a component into the final UI (e.g. DOM or Native Components). In a browser that would mean outputting a React Element into an actual DOM element.
Methods Include- constructor() | getDerivedStateFromProps() | render() | componentDidMount()
Updating
A component is updated whenever there is a change in the component's state or props.
Methods include - getDerivedStateFromProps() | shouldComponentUpdate() | render() | getSnapshotBeforeUpdate() | componentDidUpdate()
UnMounting
is when a component is removed from the DOM.
Methods include - componentWillUnmount()
These methods are used to control the behavior of a component
const App extends React.Component {
constructor(props) {
super(props)
this.state = {
points: 0
}
this.handlePoints = this.handlePoints.bind(this)
}
render() {
return (

You've scored {this.state.points} points.

);
}
Constructor
The constructor can be used to bind event handlers to the component and/or initializing the local state of the component.
Render
This function takes two arguments, HTML code and an HTML element. The purpose of the function is to display the specified HTML code inside the specified HTML element
“Props” is a special keyword in React, which stands for properties and is being used for passing data from one component to another. But the important part here is that data with props are being passed in a uni-directional flow
class Car extends React.Component {
render() {
return <Garage brand ="Mazda" />;
}
}
class Garage extends React.Component {
render() {
return (

Who lives in my garage?

 I am a {this.props.brand}!

);
}
}
ReactDOM.render(<Car />, document.getElementById('root'));
What's used to pass data to a component from outside?
What is state in React?
React Routing allows you to render the various views of the components you have within a single-page React Application. The url file path triggers which component will be displayed, and the UI remains static while components dynamically render in the browser.
import React from 'react'
import ReactDOM from 'react-dom'
import './index.css'
import { Route, Link, BrowserRouter as Router, Switch } from 'react-router-dom'
import App from './App'
import Users from './users'
import Contact from './contact'
import Notfound from './notfound'
const routing = (
<Router>

<Link to="/">Home</Link>

<Link to="/users">Users</Link>

<Link to="/contact">Contact</Link>

<Switch>
<Route exact path="/" component={App} />
<Route path="/users" component={Users} />
<Route path="/contact" component={Contact} />
<Route component={Notfound} />
</Switch>

</Router>
)
ReactDOM.render(routing, document.getElementById('root'))
Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. Click here for documentation.


RT @rsanheim: I'm running for president with my One Point Platform™ (OPP) : End Daylight Savings Time Now! #fb
11/5/2012, 8:08:59 PM
Favs: 0
Retweets: 0
link--- layout: tweet ---
RT @rsanheim: I'm running for president with my One Point Platform™ (OPP) : End Daylight Savings Time Now! #fb
11/5/2012, 8:08:59 PM
Favs: 0
Retweets: 0
link


Use your imagination, let it go. We have all at one time or another mixed some mud. Let's make a
happy little mountain now. Mix your color marbly don't mix it dead. There is immense joy in just
watching - watching all the little creatures in nature.
Use your imagination, let it go. We have all at one time or another mixed some mud. Let's make a
happy little mountain now. Mix your color marbly don't mix it dead. There is immense joy in just
watching - watching all the little creatures in nature.


Log session start time Sat May 23 18:14:28 CST 2020
| Level | Date | Message | MethodOfCaller | FileOfCaller | LineOfCaller |
| INFO | 2020-05-23 18:14:28,220 | Starting JeecgApplication on DESKTOP-9A2HSBK with PID 8588 (D:\CSM\jeecg-boot-master\jeecg-boot\jeecg-boot-module-system\target\classes started by dell in D:\CSM\jeecg-boot-master\jeecg-boot\jeecg-boot-module-system) | logStarting | StartupInfoLogger.java | 50 |
| INFO | 2020-05-23 18:14:28,223 | The following profiles are active: dev | logStartupProfileInfo | SpringApplication.java | 679 |
| INFO | 2020-05-23 18:14:29,334 | Multiple Spring Data modules found, entering strict repository configuration mode! | multipleStoresDetected | RepositoryConfigurationDelegate.java | 244 |
| INFO | 2020-05-23 18:14:29,337 | Bootstrapping Spring Data repositories in DEFAULT mode. | registerRepositoriesIn | RepositoryConfigurationDelegate.java | 126 |
| INFO | 2020-05-23 18:14:29,396 | Finished Spring Data repository scanning in 48ms. Found 0 repository interfaces. | registerRepositoriesIn | RepositoryConfigurationDelegate.java | 182 |
| INFO | 2020-05-23 18:14:29,675 | Bean 'shiroConfig' of type [org.jeecg.config.ShiroConfig$$EnhancerBySpringCGLIB$$5c5cf8e5] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:29,820 | Bean 'shiroRealm' of type [org.jeecg.modules.shiro.authc.ShiroRealm] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,292 | Bean 'securityManager' of type [org.apache.shiro.web.mgt.DefaultWebSecurityManager] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,319 | Bean 'authorizationAttributeSourceAdvisor' of type [org.apache.shiro.spring.security.interceptor.AuthorizationAttributeSourceAdvisor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,372 | Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$3c578f4f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,513 | Bean 'spring.datasource.dynamic-com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceProperties' of type [com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,518 | Bean 'com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceAutoConfiguration' of type [com.baomidou.dynamic.datasource.spring.boot.autoconfigure.DynamicDataSourceAutoConfiguration$$EnhancerBySpringCGLIB$$a5e60020] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,525 | Bean 'dsProcessor' of type [com.baomidou.dynamic.datasource.processor.DsHeaderProcessor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,530 | Bean 'dynamicDatasourceAnnotationAdvisor' of type [com.baomidou.dynamic.datasource.aop.DynamicDataSourceAnnotationAdvisor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,559 | Bean 'spring.redis-org.springframework.boot.autoconfigure.data.redis.RedisProperties' of type [org.springframework.boot.autoconfigure.data.redis.RedisProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,567 | Bean 'org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration' of type [org.springframework.boot.autoconfigure.data.redis.LettuceConnectionConfiguration$$EnhancerBySpringCGLIB$$51714d99] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,717 | Bean 'lettuceClientResources' of type [io.lettuce.core.resource.DefaultClientResources] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,807 | Bean 'redisConnectionFactory' of type [org.springframework.data.redis.connection.lettuce.LettuceConnectionFactory] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,818 | Bean 'redisConfig' of type [org.jeecg.config.RedisConfig$$EnhancerBySpringCGLIB$$a72b802f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,846 | Bean 'org.apache.shiro.spring.boot.autoconfigure.ShiroBeanAutoConfiguration' of type [org.apache.shiro.spring.boot.autoconfigure.ShiroBeanAutoConfiguration$$EnhancerBySpringCGLIB$$4f706cff] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:31,851 | Bean 'eventBus' of type [org.apache.shiro.event.support.DefaultEventBus] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) | postProcessAfterInitialization | PostProcessorRegistrationDelegate.java | 330 |
| INFO | 2020-05-23 18:14:32,244 | Tomcat initialized with port(s): 8889 (http) | initialize | TomcatWebServer.java | 90 |
| INFO | 2020-05-23 18:14:32,258 | Initializing ProtocolHandler ["http-nio-8889"] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,268 | Starting service [Tomcat] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,268 | Starting Servlet engine: [Apache Tomcat/9.0.16] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,276 | An older version [1.2.19] of the APR based Apache Tomcat Native library is installed, while Tomcat recommends a minimum version of [1.2.21] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,277 | Loaded APR based Apache Tomcat Native library [1.2.19] using APR version [1.6.5]. | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,277 | APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,277 | APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,288 | OpenSSL successfully initialized [OpenSSL 1.1.1a 20 Nov 2018] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,387 | Initializing Spring embedded WebApplicationContext | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:32,388 | Root WebApplicationContext: initialization completed in 4135 ms | prepareWebApplicationContext | ServletWebServerApplicationContext.java | 296 |
| INFO | 2020-05-23 18:14:32,673 | 动态数据源-检测到druid存在,如配置中未指定type,druid会默认配置 | <init> | DynamicDataSourceCreator.java | 113 |
| INFO | 2020-05-23 18:14:32,964 | {dataSource-1,master} inited | init | DruidDataSource.java | 1003 |
| INFO | 2020-05-23 18:14:32,964 | 初始共加载 1 个数据源 | afterPropertiesSet | DynamicRoutingDataSource.java | 203 |
| INFO | 2020-05-23 18:14:32,964 | 动态数据源-加载 master 成功 | addDataSource | DynamicRoutingDataSource.java | 142 |
| INFO | 2020-05-23 18:14:32,965 | 当前的默认数据源是单数据源，数据源名为 master | afterPropertiesSet | DynamicRoutingDataSource.java | 212 |
| INFO | 2020-05-23 18:14:35,191 | Using default implementation for ThreadExecutor | instantiate | StdSchedulerFactory.java | 1208 |
| INFO | 2020-05-23 18:14:35,202 | Initialized Scheduler Signaller of type: class org.quartz.core.SchedulerSignalerImpl | <init> | SchedulerSignalerImpl.java | 61 |
| INFO | 2020-05-23 18:14:35,203 | Quartz Scheduler v.2.3.0 created. | <init> | QuartzScheduler.java | 229 |
| INFO | 2020-05-23 18:14:35,206 | Using db table-based data access locking (synchronization). | initialize | JobStoreSupport.java | 672 |
| INFO | 2020-05-23 18:14:35,208 | JobStoreCMT initialized. | initialize | JobStoreCMT.java | 145 |
| INFO | 2020-05-23 18:14:35,208 | Scheduler meta-data: Quartz Scheduler (v2.3.0) 'quartzScheduler' with instanceId 'NON_CLUSTERED' Scheduler class: 'org.quartz.core.QuartzScheduler' - running locally. NOT STARTED. Currently in standby mode. Number of jobs executed: 0 Using thread pool 'org.quartz.simpl.SimpleThreadPool' - with 10 threads. Using job-store 'org.springframework.scheduling.quartz.LocalDataSourceJobStore' - which supports persistence. and is not clustered. | initialize | QuartzScheduler.java | 294 |
| INFO | 2020-05-23 18:14:35,209 | Quartz scheduler 'quartzScheduler' initialized from an externally provided properties instance. | instantiate | StdSchedulerFactory.java | 1362 |
| INFO | 2020-05-23 18:14:35,209 | Quartz scheduler version: 2.3.0 | instantiate | StdSchedulerFactory.java | 1366 |
| INFO | 2020-05-23 18:14:35,209 | JobFactory set to: org.springframework.scheduling.quartz.SpringBeanJobFactory@3c17794e | setJobFactory | QuartzScheduler.java | 2287 |
| INFO | 2020-05-23 18:14:36,615 | Exposing 2 endpoint(s) beneath base path '/actuator' | <init> | EndpointLinksResolver.java | 59 |
| INFO | 2020-05-23 18:14:36,739 | Mapped URL path [/v2/api-docs] onto method [public org.springframework.http.ResponseEntity<springfox.documentation.spring.web.json.Json> springfox.documentation.swagger2.web.Swagger2Controller.getDocumentation(java.lang.String,javax.servlet.http.HttpServletRequest)] | initHandlerMethods | PropertySourcedRequestMappingHandlerMapping.java | 69 |
| INFO | 2020-05-23 18:14:36,944 | Initializing ExecutorService 'applicationTaskExecutor' | initialize | ExecutorConfigurationSupport.java | 171 |
| INFO | 2020-05-23 18:14:37,658 | Context refreshed | start | DocumentationPluginsBootstrapper.java | 160 |
| INFO | 2020-05-23 18:14:37,678 | Found 1 custom documentation plugin(s) | start | DocumentationPluginsBootstrapper.java | 163 |
| INFO | 2020-05-23 18:14:37,722 | Scanning for api listing references | scan | ApiListingReferenceScanner.java | 41 |
| INFO | 2020-05-23 18:14:37,897 | Starting Quartz Scheduler now | startScheduler | SchedulerFactoryBean.java | 726 |
| INFO | 2020-05-23 18:14:38,102 | Freed 0 triggers from 'acquired' / 'blocked' state. | recoverJobs | JobStoreSupport.java | 866 |
| INFO | 2020-05-23 18:14:38,124 | Recovering 0 jobs that were in-progress at the time of the last shut-down. | recoverJobs | JobStoreSupport.java | 876 |
| INFO | 2020-05-23 18:14:38,125 | Recovery complete. | recoverJobs | JobStoreSupport.java | 889 |
| INFO | 2020-05-23 18:14:38,126 | Removed 0 'complete' triggers. | recoverJobs | JobStoreSupport.java | 896 |
| INFO | 2020-05-23 18:14:38,128 | Removed 0 stale fired job entries. | recoverJobs | JobStoreSupport.java | 901 |
| INFO | 2020-05-23 18:14:38,129 | Scheduler quartzScheduler_$_NON_CLUSTERED started. | start | QuartzScheduler.java | 547 |
| INFO | 2020-05-23 18:14:38,143 | Starting ProtocolHandler ["http-nio-8889"] | log | DirectJDKLog.java | 173 |
| INFO | 2020-05-23 18:14:38,196 | Tomcat started on port(s): 8889 (http) with context path '/jeecg-boot' | start | TomcatWebServer.java | 204 |
| INFO | 2020-05-23 18:14:38,198 | Started JeecgApplication in 10.553 seconds (JVM running for 10.905) | logStarted | StartupInfoLogger.java | 59 |
| INFO | 2020-05-23 18:14:38,208 | ---------------------------------------------------------- Application Jeecg-Boot is running! Access URLs: Local: http://localhost:8889/jeecg-boot/ External: http://<IP_ADDRESS>:8889/jeecg-boot/ swagger-ui: http://<IP_ADDRESS>:8889/jeecg-boot/swagger-ui.html Doc: http://<IP_ADDRESS>:8889/jeecg-boot/doc.html ---------------------------------------------------------- | main | JeecgApplication.java | 26 |


Movie Ticket Pricing
Make your selections to see the price.
The latest blockbuster
Big hit from last summer
A classic
Indie film
7pm
Midnight
2pm
under 18
19 - 59
60 and over
Submit
Your ticket price:


A ray that emits from an origin in a certain direction. This is used by the [page:Raycaster] to assist with [link:https://en.wikipedia.org/wiki/Ray_casting raycasting]. Raycasting is used for mouse picking (working out what objects in the 3D space the mouse is over) amongst other things.
[page:Vector3 origin] - (optional) the origin of the [page:Ray]. Default
is a [page:Vector3] at (0, 0, 0).
[page:Vector3 direction] - [page:Vector3] The direction of the [page:Ray].
This must be normalized (with [page:Vector3.normalize]) for the methods to
operate properly. Default is a [page:Vector3] at (0, 0, -1).
Creates a new [name].
The origin of the [page:Ray]. Default is a [page:Vector3] at `(0, 0, 0)`.
The direction of the [page:Ray]. This must be normalized (with [page:Vector3.normalize]) for the methods to operate properly. Default is a [page:Vector3] at (0, 0, -1).
[page:Matrix4 matrix4] - the [page:Matrix4] to apply to this
[page:Ray].
Transform this [page:Ray] by the [page:Matrix4].
[page:Float t] - the distance along the [page:Ray] to retrieve a position
for.
[page:Vector3 target] — the result will be copied into this Vector3.
Get a [page:Vector3] that is a given distance along this [page:Ray].
Creates a new Ray with identical [page:.origin origin] and [page:.direction direction] to this one.
[page:Vector3 point] - the point to get the closest approach to.
[page:Vector3 target] — the result will be copied into this Vector3.
Get the point along this [page:Ray] that is closest to the [page:Vector3]
provided.
Copies the [page:.origin origin] and [page:.direction direction] properties of [page:Ray ray] into this ray.
[page:Vector3 point] - the [page:Vector3] to compute a distance to.
Get the squared distance of the closest approach between the [page:Ray]
and the [page:Vector3].
[page:Vector3 v0] - the start of the line segment.
[page:Vector3 v1] - the end of the line segment.
optionalPointOnRay - (optional) if this is provided, it receives the point
on this [page:Ray] that is closest to the segment.
optionalPointOnSegment - (optional) if this is provided, it receives the
point on the line segment that is closest to this [page:Ray].
Get the squared distance between this [page:Ray] and a line segment.
[page:Plane plane] - the [page:Plane] to get the distance to.
Get the distance from [page:.origin origin] to the [page:Plane], or `null`
if the [page:Ray] doesn't intersect the [page:Plane].
[page:Vector3 point] - [page:Vector3] The [page:Vector3] to compute a
distance to.
Get the distance of the closest approach between the [page:Ray] and the
[page:Vector3 point].
[page:Ray ray] - the [page:Ray] to compare to.
Returns true if this and the other [page:Ray ray] have equal [page:.origin origin]
and [page:.direction direction].
[page:Box3 box] - the [page:Box3] to intersect with.
[page:Vector3 target] — the result will be copied into this Vector3.
Intersect this [page:Ray] with a [page:Box3], returning the intersection
point or `null` if there is no intersection.
[page:Plane plane] - the [page:Plane] to intersect with.
[page:Vector3 target] — the result will be copied into this Vector3.
Intersect this [page:Ray] with a [page:Plane], returning the intersection
point or `null` if there is no intersection.
[page:Sphere sphere] - the [page:Sphere] to intersect with.
[page:Vector3 target] — the result will be copied into this Vector3.
Intersect this [page:Ray] with a [page:Sphere], returning the intersection
point or `null` if there is no intersection.
[page:Vector3 a], [page:Vector3 b], [page:Vector3 c] - The [page:Vector3]
points making up the triangle.
[page:Boolean backfaceCulling] - whether to use backface culling.
[page:Vector3 target] — the result will be copied into this Vector3.
Intersect this [page:Ray] with a triangle, returning the intersection
point or `null` if there is no intersection.
[page:Box3 box] - the [page:Box3] to intersect with.
Return true if this [page:Ray] intersects with the [page:Box3].
[page:Plane plane] - the [page:Plane] to intersect with.
Return true if this [page:Ray] intersects with the [page:Plane].
[page:Sphere sphere] - the [page:Sphere] to intersect with.
Return true if this [page:Ray] intersects with the [page:Sphere].
[page:Vector3 v] - The [page:Vector3] to look at.
Adjusts the direction of the ray to point at the vector in world
coordinates.
[page:Float t] - The distance along the [page:Ray] to interpolate.
Shift the origin of this [page:Ray] along its direction by the distance
given.
[page:Vector3 origin] - the [page:.origin origin] of the [page:Ray].
[page:Vector3 direction] - the [page:.direction direction] of the
[page:Ray]. This must be normalized (with [page:Vector3.normalize]) for
the methods to operate properly.
Sets this ray's [page:.origin origin] and [page:.direction direction]
properties by copying the values from the given objects.
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]


Could Le'veon Bell be out for season
I will probably make it for some of this season.''
Rex Burkhead out for the season with a knee injury.
Will the Rams be undefeated for the whole season.
Todd Gurley is very positive about being udefeated.
Click to go to ESPN.com


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Represents an oEmbed representation of a Tweet.
More...
|
| string | Html [get, set] |
| | Gets or sets the HTML code that can be embedded. More...
|
| |
| string | AuthorName [get, set] |
| | Gets or sets the name of the author. More...
|
| |
| string | AuthorUrl [get, set] |
| | Gets or sets the URL of the author. More...
|
| |
| string | ProviderUrl [get, set] |
| | Gets or sets the URL of the provider. More...
|
| |
| string | ProviderName [get, set] |
| | Gets or sets the name of the provider. More...
|
| |
| string | Url [get, set] |
| | Gets or sets the URL. More...
|
| |
| string | Version [get, set] |
| | Gets or sets the version. More...
|
| |
| string | Type [get, set] |
| | Gets or sets the type. More...
|
| |
| int? | Height [get, set] |
| | Gets or sets the height of the embed object. More...
|
| |
| int? | Width [get, set] |
| | Gets or sets the width of the embed object. More...
|
| |
| string | CacheAge [get, set] |
| | Gets or sets the age of the cache. More...
|
| |
| RateLimit | RateLimit [get, set] |
| | Gets or sets the rate limit of the response. More...
|
| |
| string | Json [get, set] |
| | Gets or sets the JSON of the response. More...
|
| |
Represents an oEmbed representation of a Tweet.
◆ AuthorName
| string CoreTweet.Embed.AuthorName |
|
getset |
Gets or sets the name of the author.
◆ AuthorUrl
| string CoreTweet.Embed.AuthorUrl |
|
getset |
Gets or sets the URL of the author.
◆ CacheAge
| string CoreTweet.Embed.CacheAge |
|
getset |
Gets or sets the age of the cache.
◆ Height
| int? CoreTweet.Embed.Height |
|
getset |
Gets or sets the height of the embed object.
◆ Html
| string CoreTweet.Embed.Html |
|
getset |
Gets or sets the HTML code that can be embedded.
◆ Json
| string CoreTweet.Embed.Json |
|
getset |
Gets or sets the JSON of the response.
◆ ProviderName
| string CoreTweet.Embed.ProviderName |
|
getset |
Gets or sets the name of the provider.
◆ ProviderUrl
| string CoreTweet.Embed.ProviderUrl |
|
getset |
Gets or sets the URL of the provider.
◆ RateLimit
Gets or sets the rate limit of the response.
This property will always be null when obtained from (most of) the POST endpoints, unless the rate is explicitly stated in the Twitter official documentation.
◆ Type
| string CoreTweet.Embed.Type |
|
getset |
◆ Url
| string CoreTweet.Embed.Url |
|
getset |
◆ Version
| string CoreTweet.Embed.Version |
|
getset |
Gets or sets the version.
◆ Width
| int? CoreTweet.Embed.Width |
|
getset |
Gets or sets the width of the embed object.
The documentation for this class was generated from the following file:


& Other Stories Are Honouring Female Scientists With Their Latest Design Collab
Another day, another high street collaboration. But this one definitely deserves the 'newsworthy' tag. To celebrate the achievements of three notable female scientists, & Other Stories has teamed up with Giorgia Lupi, an information designer who has managed to create wearable data.
Using the historic work of mathematician Ada Lovelace, astronaut Mae Jemison, and conservationist Rachel Carson, Lupi has created a number of truly beautiful prints.
Lovelace wrote an algorithm that formed the basis of computers, inspiring a design that uses dashes to represent passages of said algorithm, per Vogue. Jemison —the first woman of colour in space —has unsurprisingly inspired a planetary-type pattern. A combination of circles and lines depicts the astronaut's orbits around earth and her time spent up above. Carson is the author of the 1962 book that drew attention to the environment, Silent Spring. The resulting natural print uses the likes of petal shapes to represent book chapters and colours to depict Carson's favoured language.
“They were pioneers in fields that were historically male-dominated,” Lupi told Vogue. “But I wanted to focus on their significant accomplishments, not necessarily just on their lives as women. Sometimes it’s easier to focus on the obstacles they overcame, but to be really aspirational, I think it’s important to look at the contributions they brought to the world.”
The 13-piece collection combines cosy knits with floaty dresses and silky shirts. Plus, there's a few classic tees to choose from. As well as highlighting the work of these monumental women, the designs prove the importance of visualising data. As Lupi explained to & Other Stories: "Data doesn’t have to be scary or intimidating, because, if you think about it, data isn’t even real! Rather it’s abstract, representing the details of our lives and our ideas."


What is jQuery? jQuery is a JS library that provides easy frameworks for dynamic HTML elements.
What does jQuery do for you? jQuery makes it easy to make HTML elements dynamic. If you click, hover, etc... jQuery can make HTML elements react.
What did you learn about the DOM while working on this challenge? I learned about the DOM hierarchy, where HTML elements are read down the page.


This is just a simple demo of how to create angular.js directives and share then on npm. In particular, this demo shows a typeahead directive.
The source code for this demo can be found here: typeahead.demo
This is a very basic demo of typeahead directive:
Selected address: {{addressModel | json}}
This demo shows how to render custom template:
Selected address: {{customAddressModel | json}}


Attendees
Projects
Iterations
About Us
Superposition IV is the oldest and largest 24-hour hackathon for high school and college females (trans and non-binary inclusive) in the Bay Area. This event is free to attend, and wi-fi, food, swag, and workspaces will be provided. Bring your passion for computer science and we'll take care of the rest! It's the perfect opportunity for anyone to take their next step forward in tech.
Our mission is to empower young womxn in tech of all levels of experience by providing a supportive environment for them to explore their passion for computer science. Additionally, we want to encourage more girls to join, learn, and thrive in technology-related fields.
Testimonials
"I went in, dead set on being a pre-med major, only wanting to try out CS just for fun… after 24 hours, I had attained an unimaginable amount of knowledge. In the end, I’m so grateful for this experience and the opportunity to have discovered a new seed of passion."
"Superposition allowed me to discover different tech career paths, meet other girls with similar interests, and be mentored by people in the industry in a comfortable and inclusive environment."
"Superposition was memorable to me because it helped me expand my knowledge about computer science in a very safe and friendly environment. My experience at Superposition inspired me to take APCS at my school to continue studying and learning about computer science!"
Frequently Asked Questions
Hackathons are competitive coding events where teams have limited time to develop a solution to a real-world problem using technology. In teams of 4, students will work together to build a project and pitch their solution to a panel of judges for the chance to win awesome prizes. Overall, hackathons are here to provide a supportive environment with free food, mentors, and awesome activities to help you learn and succeed!
This event is absolutely free to attend. Get ready for free swag, food, and lots of fun!
A valid ID (like a school ID), signed and completed waivers, a laptop, charger(s), sleeping bag/pillow (optional), toiletries, and layers—the venue may be chilly! Our venue will be on lockdown throughout the night and we will have security. Attendees are recommended to stay overnight! If you are unable to stay overnight, please contact a Superposition organizer to make special arrangements. You must be signed out by a parent.
All female-identifying, trans or non-binary high school and college students are welcome to come as an attendee. Although we do NOT accept males as attendees, we wholeheartedly welcome all genders to volunteer as a mentor, workshop leader, judge or Campus Ambassador!
We encourage people to work in teams of up to four. Additionally, there will be icebreakers in the beginning to help you find a team! You are not required to sumbit a hack, but there will be workshops and mentors on-hand to help you.
Yes! We have separate travel reimbursement programs for high school and college students. Find more info here.
Yes, we do! To ensure that Superposition IV is welcoming, all attendees, mentors, and volunteers are required to abide by our code of conduct.
We are looking for mentors, workshop leaders, women in tech panelists, and sponsors! If you are interested in learning more about how you can help support Superposition, please email us at<EMAIL_ADDRESS>Sign up to be a mentor, judge, or women in tech panelist here.
You need absolutely no prior experience to attend this hackathon. There will be mentors throughout the day to help you out!
To ensure fairness, we want all participants to start a project from scratch once they form a team at our event. Feel free to brainstorm ideas beforehand!
You can apply at here! Applications will close February 16th at 11:59 PST.
We highly encourage attendees to stay overnight, but if you must leave early or for any portion of the hackathon, please notify us in advance at<EMAIL_ADDRESS>If you are under 18, you must be signed out by a parent with an ID.
Schedule
10:00 AM Check In
10:45 AM Opening Ceremony
11:15 AM Form Teams
12:00 PM Lunch + hacking begins!
7:00 PM Dinner + Women in Tech Panel
12:00 AM Midnight activities and snacks!
8:30 AM Attendee Breakfast
9:00 AM Submissions Due
9:30 AM Judging Begins
11:00 AM Closing Ceremony
11:30 AM Superposition IV Ends
Sponsors


Current Task
What are you working on?
Work for
Break for
minutes left until
minute break
No current task
Clear
Site
Time
Percent
Summaries
Task Title
Worked 25 minutes, break 5 minutes
Leaderboard


In the Quicksort challenges, you sorted an entire array. Sometimes, you just need specific information about a list of numbers, and doing a full sort would be unnecessary. Can you figure out a way to use your partition code to find the median in an array?
Challenge
Given a list of numbers, can you find the median?
Input Format
There will be two lines of input:
Output Format
Output one integer, the median.
Constraints
Sample Input
7 0 1 2 4 6 5 3
Sample Output
3


In C programming language provides many built-in functions which helps you to read and write the data. stdib
is the standard C library for the input and output operations.Their are mainly three types of intput adn output functions,they are :
The standard header file contains these functions printf()
and scanf()
,in which scanf()
it is used read user input and it returns user input and printf()
function is used to display ouput or result.
NOTE : in the above program their is usage of '%d' in the program,that is known as the Format String . The Format string this is used to inform the scanf() and printf() which type of input or output is used respectively.
In this getchar()
is function which reads only one character at a time and return it as an integer.putchar()
is function which is used to display result on to screen and it also display one chracter at a time.
In this gets()
function reads a line from the stdin into a pointer until the newline or EOF (end of file) .puts()
function writes the string str and a trailing newline to stdout.


(Function-keys and other).
There are a few differences in WinFBB from DosFBB. For WinFBB: Most of these commands will open a window. The server operation is NOT suspended while these windows stay open. F1 - Help. F2 - Connect to the BBS locally with the console-callsign. F3 - Disconnect a channel. F4 - Start or stop forwarding. Shows how many/big messages are waiting for forward right now (real-time). Click on the BBS(s) you want to start forward to, and click "Start Fwd". There are also buttons for "Start All" and "StopFwd", as well as import and export. F5 - Toggle monitoring on/off. F6 - Change console-callsign. That callsign is used when connecting to the BBS with F2 or via gateway F9. The callsign have sysop-status. F7 - Program TNC directly. This allows a dynamic modification of the parameters which will be affected as default to the channels of the related port. These parameters will not be taken into account for the channels already connected, and will be transferred to the channel upon disconnect. The commands are specific to the TNC in use: WA8DED with a TNC2, HostMode PK232 with a PK232, or the BPQ node. F8 - Not used F9 - Gateway, using console-callsign. F10 - Initiate a chat with a user (click on the user first). ALT-F1 - Not used ALT-F2 - Not used ALT-F3 - Start or stop forward-scan. Before starting scanning, FORWARD.SYS and its include-files, BBS.SYS and SWAPP.SYS are recompiled. ALT-F4 - Quit FBB. ALT-F5 - Start a text-editor. ALT-F6 - Not used ALT-F7 - Show last connections. ALT-F8 - Not used ALT-F9 - Not used ALT-F10- Not used ALT-B - Not used ALT-D - Not used ALT-R - Not used ALT-N - Not used ALT-S - Not used ALT-X - Not used CTRL-F1 to CTRL-F10 hold pre-defined texts, that are sent when pressing that key. The texts are in the file MEMO.SYS. Works only in the editor. Exceptions: CTRL-F1 and CTRL-10 are captured by Windows. CTRL-F4 exits the editor. In addition to the function-keys, there are quite a few push-buttons on the screen in WinFBB, in standard Windows-fashion. Click on them to get the wanted result. This should be self-explanatory. Much information may be retrieved this way, and many things may be configured this way. In addition to the main FBB-window, you may want to have open at the same time the DISPLAY ALL CHANNELS and MONITOR windows (I do, hi). They may be re-sized to fit beside and under the main FBB-window. The windows position and size and saved if you stop the BBS. For LinFBB: No function-keys are available in LinFBB. For DosFBB: Most of these commands will open a window. The server operation is suspended while these windows stay open, but the user requests are queued and will not be lost. If no reply is given, the window will close down after a few seconds, and the default reply will not be taken into account. Do not forget to validate your replies with "Enter". F1 - General help on all function-keys. F2 - Connect to the BBS locally with the console-callsign. F3 - Disconnect a channel. F4 - Start or stop forwarding. Manual forwarding request, or cancellation of current forwarding. If a number up to 8 is specified, the corresponding port will be scanned for forwarding. If the number 9 is specified, all ports will be scanned. If a callsign is specified, it will be scanned for forwarding. Preceding the callsign with + will force reverse even if there is no waiting mail, preceding the callsign with - will stop the forwarding and disconnect. F5 - Toggle monitoring on/off. With monitor on, the lower part of the screen displays the monitored traffic, while the upper part of the screen shows traffic in the BBS. Number of lines in upper/lower part of the screen, can be adjusted with the arrow-up or arrow-down keys. F6 - Change console-callsign. That callsign is used when connecting to the BBS with F2 or via gateway F9. The callsign have sysop-status. F7 - Program TNC directly. This allows a dynamic modification of the parameters which will be affected as default to the channels of the related port. These parameters will not be taken into account for the channels already connected, and will be transferred to the channel upon disconnect. The commands are specific to the TNC in use: WA8DED with a TNC2, HostMode PK232 with a PK232, or the BPQ node. F8 - Reboot PC. Can be done at once, or when all channels are free. F9 - Gateway, using console-callsign. F10 - Talk to a user (that have sent a T) or initiate a chat with a user. ALT-F1 - Shows pending forward(s). Shows number of personal messages, bulletins, and the total amount of kB waiting to be forwarded. ALT-F2 - Shows all callsigns connected to the BBS. ALT-F3 - Start or stop forward-scan. Before starting scanning, FORWARD.SYS and its include-files, BBS.SYS and SWAPP.SYS are recompiled. ALT-F4 - Shows the last connected callsigns. ALT-F5 - Starts a very simple text-editor (use F1 for help there). ALT-F6 - Various "options" : Sysop is in ? Enables T-command. Beep at connect ? Show callsigns etc. on every channel ? Gateway allowed ? Justification on text typed from console ? Use screen editor ? ALT-F7 - Import messages from file. ALT-F8 - Export messages to file. Messages that are waiting to be forwarded to one BBS. These messages can be forwarded to a file. ALT-F9 - Exit to DOS. WARNING: the BBS operation is suspended all this time long. The users will not be disconnected, and their commands will be queued. Return to BBS by typing EXIT. ALT-F10- Stop the mailbox-program. Can be done at once, or when all channels are clear. ALT-B - Blank screen. ALT-D - Save scroll-buffer to file. ALT-N - Allows reprogramming a telephone modem ALT-R - Redisplay screen. ALT-S - Show last DOS-screen. Press a key to return to BBS. ALT-X - Stop the BBS (same as ALT-F10). CTRL-F1 to CTRL-F10 holds pre-defined texts, that are sent when pressing that key. The texts are in the file MEMO.SYS. Arrow -> - Display next channel. Arrow <- - Display previous channel. Ctrl -> or Ctrl <- Return to the display of all channels. PG-UP Display the previous page if it exists PG-DW Display next page. HOME Display the first page. END Display the last page. This page was last updated


Melting Pot
Known For-Seafood and Oriental FareGajalee
Known For-Bombil FryJoss
Known For-Sushi SpecialsGadda Da Vida
Known For-View Of the SeaRuka
Known For-Chinese, Japanase and Asian
Options - The Fashion Mall - Juhu, Vile Parle
Dynamic Mall
Shoppers Stop
The design of G7 mall is evocative of a charming shopping hub in a bollywood people dominant area. The G7 Mall located in Andhe India for females only. DirectionsIntop
StarBucks
Famous for-Signature Hot ChocolateChaayos,Juhu
Famous for- TeaGrandmama’s Cafe
Famous For-ItalianPrithvi Cafe
Famous For-Cafe housed in the Prithvi TheatreThe Lagoon-Sea Princess
Famous For-Coffee
Trilogy NightClub
Sprawling 2-floor nightclub with dazzling crystal lighting and Arabian Sea views serving Asian food.Rock Bottom
Gadda Da Vida
Cushioned rattan chairs are positioned for Arabian Sea views at this serene al fresco hotel loungeClub Escape
Contemporary nightclub and bar hosting a line-up of DJs and regular drinks promotionsNovotel-Premier Lounge
PVR Premiere Juhu
Chandan Cinema
-
Iskcon Temple
DirectionsJuhu Beach
DirectionsSt. Joseph's Church, Juhu
DirectionsPrithvi Theatre
Directions
Juhu Residency Boutique Hotel
DirectionsJW Marriott Mumbai Juhu
DirectionsZ Luxury Residences
DirectionsRamada Plaza Palm Grove
DirectionsThe Emerald
Directions


"If there's one thing you learn by working
on a lot of different Web sites,
it's that almost any design idea-no matter
how appallingly
bad-can be made usable in the
right circumstances, with enough
effort."
― Steve Krug
{{ quote.description }}


Hub gene validation. a The expression of 20 genes in LMP tumors and EOC samples in GSE12172. *** p < 0.001. b ROC curve analysis was performed to assess the capacity of 20 genes in differential diagnosis of LMP tumors and EOC. c Prognostic forest map of 20 genes in EOC patients


 Why can you download only certified apps ? How do you get to talk over email, what makes you so sure that you can share your bank details over the internet? Raghav Goyal studies the basics of cryptography, which includes historic encryption methods from the world war II to modern times and a lot more . You can find a report of his learnings here!
Bits and Public key Systems:
Bit Strings
Modern ciphers do not involve letter substitutions. They tend to use an encoding scheme to convert the message into a sequence of binary digits. The most commonly used encoding scheme is probably ASCII. This bit sequence representing the plaintext is then encrypted to give the ciphertext as a bit sequence.
ASCII requires eight bits to represent one character, and so for a block cipher that has 64-bit blocks, the encryption algorithm acts on eight characters at once.
Consider the following sequence of 12 bits:<PHONE_NUMBER>10. If we split into blocks of size 3 we get: 100 111 010 110, our sequence becomes 4 7 2 6.
000=0, 001=1, 010=2, 011 = 3, 100=4, 101=5, 110=6, 111 = 7
Another common way of writing bit-strings is to use the hexadecimal notation (HEX). For HEX the string is divided into blocks of size 4 with the following representation:
0000 = 0 0100 = 4 1000 = 8 1100 = C
0001 = 1 0101 = 5 1011 = 9 1101 = D
0010 = 2 0110 = 6 1010 = A 1101 = E
0011 = 3 0111 = 7 1011 = B 1111 = F
Symmetric cryptography:
a) stream cipher b) block cipher
Stream cipher encrypts bits individually.
Encryption and decryption are simple additions modulo 2 (aka XOR)
• Encryption and decryption are the same functions
• Encryption: yi =esi(xi )=xi +si mod2 xi ,yi ,si ∈{0,1} • Decryption: xi =esi(yi )=yi +si mod2
Modulo 2 addition is equivalent to XOR operation (Nice way of encryption)
• For perfectly random key stream si , each ciphertext output bit has a 50% chance to be 0 or 1 .
• Inverting XOR is simple, since it is the same XOR operation
Block Ciphers:
Always encrypt a full block (several bits) Are common for Internet applications Initially it was thought, best way to secure a system is to keep the encryption and decryption secret from the public! However recently its been realised that encrytion and decryption algorithms should be kept open reason is, its the only way to be sure that the functions used are secure.
This highlights a potential weakness for stream ciphers because anyone who is able to launch a known plaintext attack can deduce parts of the keystream sequence from the corresponding plaintext and ciphertext bit pairs. Thus, users of stream ciphers must protect against attacks where the attacker deduces part of the keystream
Block ciphers can be used to provide confidentiality, data integrity, or user authentication, and can even be used to provide the keystream generator for stream ciphers. As with stream ciphers, it is very difficult to give a precise assessment of their security. If an attacker has obtained a known plaintext and ciphertext pair for an unknown key, then that should not enable them to deduce easily the ciphertext corresponding to any other plaintext block. This is just one reason for requiring a block cipher to satisfy the diffusion property which is that a small change in the plaintext, maybe for example in one or two positions, should produce an unpredictable change in the ciphertext. Block ciphers should satisfy the confusion property which is, in essence, that if an attacker is conducting an exhaustive key search then there should be no indication that they are ‘near’ to the correct key.
The simplest, and perhaps the most natural, way to apply a block cipher to a long message is to divide the binary sequence into blocks of appropriate size and then to encrypt each block individually and independently. When this occurs we say we are using the Electronic Code Book mode or ECB mode.
Each of these potential dangers of using a block cipher in ECB mode can be removed by arranging for the encryption of each individual block to depend on all the message blocks that precede it in the message. If this is done, then identical message blocks almost certainly give distinct cryptogram blocks, and manipulation of the cryptogram is likely to result in meaningless messages after decryption has been applied. There are two standard ways of effecting this. They are known as Cipher Feedback (CFB) mode and Cipher Block Chaining (CBC) mode and are discussed later.
Large messages need to be condensed into short bit-strings, it is inevitable that more than one message can give rise to the same shorter bit- string and this automatically implies that the process is irreversible. These functions are known as hash functions and, depending on the application, they may or may not involve the use of a cryptographic key.
The basic idea of a hash function is that the resultant hash value is a condensed representative image of the message. The hashed value has a number of names including digital fingerprint, message digest, or, not surprisingly, a hash. Hashing has a number of applications, including the provision of data integrity and as part of the digital signature process.
In a public key cryptosystem each entity has a public key and a corresponding private key. These keys are chosen so that it is practically impossible to deduce the private key from the public key. Anyone wishing to use this system to send a secret message to someone else needs to obtain that person’s public key and use it to encrypt the data. It is also worth observing that when a public key system is used to provide confidentiality then, since the public encryption key is widely known and can be used by everyone, the ciphertext does not provide any authentication of the sender.
For a public key system both the algorithm and the encryption key are public. Thus an attacker is faced with the task of trying to deduce the message from the cryptogram. Encryption process needs to be chosen very carefully. Genuine receiver needs to be able to decrypt easily. Thus the process must be chosen so that knowledge of the decryption key facilitates the determination of the message from the cryptogram.
Perfect Secrecy:
An Example:
Suppose that Mr X is about to make a decision that will have serious repercussions on the share value of a company. If he makes the decision ‘buy’ then the shares will increase in value, but the decision ‘sell’ will result in a collapse in their value. Clearly anyone who received this decision before the broker would have the opportunity to use that information to either make a profit or avoid a disastrous loss, depending on the decision.
In order to protect their interests, he and his broker decide to encrypt the message that will convey the decision. One option might be to use a Simple Substitution Cipher that, as we have already noted, is usually sufficient for protecting short messages. Knowledge of the length of the cryptogram would be sufficient to give the interceptor 100 per cent confidence that he knew the message, even though he could not determine the key used.
Another option might be to use the following system in which the two keys, k1 and k2, are equally likely. In order to describe the complete algorithm we use a standard notation. For key k1, the ciphertext for the plaintext message BUY is 0 while the ciphertext for SELL is 1. To express this simply we write
Ek1 (BUY) = 0 and Ek1 (SELL) = 1.
The complete cipher is:
Key k1: Ek1 (BUY) = 0, Ek1 (SELL) = 1
Key k2: Ek2 (BUY) = 1, Ek2 (SELL) = 0
Note that, in essence, before the cryptogram was intercepted the attackers’ only option was to try to guess the message. Once the cryptogram was received, they could also guess the key. Since the number of keys is the same as the number of messages, the chances of either guess being correct are equal. This is perfect secrecy.
One-time Pad
The classic example of a perfectly secure cipher system is the one-time pad. If the message is a passage of English text containing n letters with all punctuation and spaces removed, then the key, which is only used once to protect a single message, is a randomly generated sequence of n letters from the alphabet. The encryption rule is precisely that used for the Vigenère Cipher with the key replacing the keyword. Thus, if we associate each letter A to Z with the numbers 0 to 25 in the usual way, for message m1, m2,…, mn and key k1, k2,…, kn, the ith component of the
cryptogram is given by:
ci = (mi + ki) mod 26
There is another common version of this algorithm often called a Vernam Cipher where the alphabet used is binary, that is 0 and 1, and the cryptogram is obtained by adding the message and key modulo 2.
The problem with the one-time pad is that, since the keystreams are random, it is impossible to generate the same keystream simultaneously at both the sender and receiver. Thus they require a second secure channel for distributing the random keys
Problem:
The implementers of the communications system are now faced with a potentially difficult problem. How does the receiver obtain this random sequence? Since the sequence is randomly generated it is ‘impossible’ for the sender and receiver to generate the same key simultaneously. One-time pads can only be used if the communicators have a second secure means of exchanging information.
Types of ciphers:
Modern application of cryptography
GNU pg Tru-crypt Secure shell plugin for thunderbird cell phone bank cards VPN IPOD kindle Even our mobiles, GSM was one of the best advances in cryptography. Voice encryption basically!
Caesar Cipher
Caesar Cipher described each of the letters A to W is encrypted by being represented by the letter that occurs three places after it in the alphabet. (shift of 3). here shift can be by any number and it is vulnerable to attack.
Let k, x, y ε {0,1, …, 25} • Encryption: y=ek(x)≡x+kmod26 • Decryption: x=dk(x)≡y-kmod26
Affine cipher
Improving caesars cipher y=(a.x+b) mod26
Simple Substitution Ciphers
Although having a large number of keys is a necessary requirement for cryptographic security, it is important to stress that having a large number of keys is certainly no guarantee that the cipher system is strong. The discussion of this cipher establishes the dangers of relying on a large number of keys as an indication of strength.
When a Simple Substitution Cipher is used each specific letter of the alphabet is replaced by the same substituted letter. Thus if, for example, we use a cipher where R replaces E, then the frequency of R in the cryptogram is equal to the frequency of E in the message.
The number of keys for a Simple Substitution Cipher is equal to the number of ways in which the 26 letters of the alphabet can be arranged. It is called 26 factorial and is denoted by 26!
note that there is a 200-page novel that does not use the letter E (Gilbert Adair’s translation of A Void by Georges Perec).
adPlayfair cipher
The Playfair is an example of a ‘Bigram‘ Cipher. This means that letters are encrypted in pairs, as opposed to individually. The key is a 5 by 5 square (with entries comprised of the 25 letters obtained by deleting J from the alphabet).
Before encrypting using a Playfair Cipher the message has to be rearranged slightly. To do this you:
replace J’s with I’s
write message in pairs of letters
do not allow identical pairs – if they occur insert Z between them
if the number of letters is odd, add Z to the end
We extend the key by adding a sixth column and a sixth row to the original key. The sixth row is identical to the first row, while the sixth column is identical to the first column.
The rule for encryption is as follows.
If the two letters lie in the same row of the key then each letter is replaced by the one on its right in the extended key.
If two letters lie in the same column of the key then each letter is replaced by the one below it in the extended key.
If the two letters are not in the same row or column then the first letter is replaced by the letter that is in the row of the first letter and the column of the second letter. The second letter is replaced by the fourth corner of the rectangle formed by the three letters used so far.
We now encrypt the message: GOOD BROOMS SWEEP CLEAN
GO OD BR OZ OM SZ SW EZ EP CL EA NZ
The complete cryptogram is
FP UT EC UW PO DV TV BV CM BG CS DY
Homophonic Coding
Introducing some extra characters so that, for ex, the plaintext letter E is represented by more than one ciphertext character.
These extra characters are known as randomizing elements and the process of expanding the alphabet is called homophonic coding. As an illustration we might introduce a cipher where the alphabet for the cryptogram would be the numbers 00, 01, 02,…, 31. Each cryptogram number represents a unique plaintext letter but the letters A, E, N, O, R, T are each represented by two distinct letters.
Polyalphabetic Ciphers
When a homophonic cipher is used, the frequency histogram of the cryptogram is made flatter by increasing the size of the alphabet. This ensures that more than one ciphertext character may represent the same plaintext character. However, it is still true that each ciphertext character represents a unique plaintext character and there is always the danger of an attacker compiling a dictionary of known plaintext and ciphertext pairs for a given key.
Vigènere Ciphers
The Vigenère Cipher is probably the best known of the ‘manual’ polyalphabetic ciphers.
One of the most common methods for using the square to obtain a cipher
Message : P L A I N T E X T
Key : f r e d f r e d f
To encrypt the initial letter P we use the key letter beneath it which, in this case, is f. Thus to encrypt P we go to the row of the square determined by f and read off the letter beneath P, which is U. Similarly we encrypt L by taking the letter underneath it in the row determined by r, which is C. The process for encrypting P with key letter f is illustrated here.
Transposition Ciphers
In our example the key is a small number. We use 5 as the key. In order to encrypt a message using this key, we write the key in rows of 5 letters and encrypt by writing the letters of the first column first, then the second column etc. If the length of the message is not a multiple of 5 then we add the appropriate number of Zs at the end before we encrypt. The process is most easily understood by working through a small example.
 Since the key is 5 the first step involves writing the message in rows of 5 letters. This is:
WHATW ASTHE WEATH ERLIK EONFR IDAY
Since the length of the message is not a multiple of 5, we must add one Z to get: WHATW
ASTHE WEATH ERLIK EONFR IDAYZ
We now read down each column in turn to get the following cryptogram:
WAWEEIHSERODATALNATHUFYWEHKRZ
SUPER ENCRYPTION
Combination of two or more ciphers.
If, say, we want to super-encrypt using a Simple Substitution Cipher and a Transposition Cipher, then we first encrypt the message using the Simple Substitution Cipher, and then encrypt the resultant cryptogram using the Transposition Cipher.
Basics of cryptography:
The attacker is only able to break an algorithm if they have sufficient information to enable them to recognize the correct key or, more frequently, to identify incorrect keys. It is important to realize that this extra information is likely to be crucial to the attacker. Suppose, for instance, that they know the plaintext was English text, and that the decryption of some ciphertext using a guessed key does not give meaningful English plaintext. In this case, the guessed key must be incorrect.
A cipher system is called symmetric if it easy to deduce the decryption key from the encryption key. However, if it is practically impossible to deduce the decryption key from the encryption key, then the system is called asymmetric or public key. One reason for distinguishing between these two types of system should be clear. In order to prevent an interceptor with knowledge of the algorithm from obtaining the plaintext from intercepted ciphertext it is essential that the decryption key should be secret. Whereas for a symmetric system this necessitates that the encryption key should also be secret, if the system is asymmetric then knowledge of this key is of no practical use to the attacker. Indeed it can be, and usually is, made public. One consequence of this is that there is no need for the sender and receiver of a cryptogram to share any common secrets. In fact there may be no need for them to trust each other.
There is a famous principle of cryptography which asserts that the security of a cryptographic system must not depend on keeping secret the cryptographic algorithm it should depend only on keeping secret the decryption key.
An attack which utilizes the existence of known plaintext and ciphertext pairs is called a known plaintext attack. If the plaintext is selected by the attacker then it is a chosen plaintext attack. Finally, an attack which has direct knowledge only of the ciphertext is known as a ciphertext-only attack.
If we assume that our decryption algorithm is known then there is one obvious method of attack available to any adversary. They could, at least in theory, try each possible decryption key and ‘hope’ that they identify the correct one. Such an attack is called an exhaustive key search. However, as we see when we consider some simple examples, unless there is sufficient volume of corresponding plaintext and ciphertext pairs, there may be many incorrect choices for the decryption key which give the correct answers for all the available ciphertext.
Keys: A real life situation
For the example we assume that the sender has a present, which he wants to lock in a briefcase with a padlock and send to someone, whom he is not prepared to trust with his own key. Instead the sender instructs the intended receiver to buy his own padlock and key.
Step 1: The sender places the present in the briefcase, which they lock with their padlock and remove their key. They then send the locked briefcase to the receiver.
However, the receiver is also unable to obtain the present.
Step 2: The receiver locks the briefcase with their own padlock and removes the key. They then return it to the sender.
The briefcase is now locked with two padlocks so no one can get the present. The sender uses their own key to remove their padlock from the briefcase and returns the briefcase to the receiver.
Step 3: The receiver removes their padlock from the briefcase to obtain the present.
PROBLEM HERE:
In this simplistic example we have to admit that the sender has no way of knowing whose padlock is on the briefcase and that it might be possible for an adversary to impersonate the receiver and place their padlock on the briefcase. This is a problem that has to be addressed. The Whose padlock is it?’ question in this briefcase example is similar to the Whose public key is it?’ question that is so important when public key systems are used.
Kerckhoffs’s Principle:
The principle says that the system should be secure even if the attacker knows all the details about the system with the exception of the secret key.
Classical Attacks •Mathematical Analysis • Brute-Force Attack
Implementation Attack: Try to extract key through reverese engineering or power measurement, e.g., for a banking smart card.
Social Engineering: E.g., trick a user into giving up his/her password
Arithmetic Modulo:
By doing arithmetic modulo m we obtain the integer ring Zm
An element a ε Zm has a multiplicative inverse only if: gcd (a, m) = 1
• Ex: We consider the ring Z9 = {0,1,2,3,4,5,6,7,8} The elements 0, 3, and 6 do not have inverses since they are not coprime to 9. The inverses of the other elements 1, 2, 4, 5, 7, and 8 are:
1-1 ≡ 1 mod 9 2-1 ≡ 5 mod 9 4-1 ≡ 7 mod 9 5-1 ≡ 2 mod 9 7-1 ≡ 4 mod 9 8-1 ≡ 8 mod 9
Introduction to cryptology:
Cryptology is defined as the science of making communication incomprehensible to all people except those who have a right to read and understand it. The study of cryptology consists of two parts:
• cryptography, which concerns itself with the secrecy system itself and its design, and
• cryptanalysis, which concerns itself with the breaking of the secrecy system above.
Early signs of encryption in Eqypt in ca. 2000 B.C. Letter-based encryption schemes (e.g., Caesar cipher) popular ever since.
• Symmetric ciphers: All encryption schemes from ancient times until 1976 were symmetric ones.
• Asymmetric ciphers: In 1976 public-key (or asymmetric) cryptography was openly proposed by Diffie, Hellman and Merkle.
• Hybrid Schemes: The majority of today‘s protocols are hybrid schemes, i.e., the use both symmteric ciphers (e.g., for encryption and message authentication) and asymmetric ciphers (e.g., for key exchange and digital signature).
The encrypted plaintext is called the ciphertext or cryptogram and the set of rules used to encrypt information plaintext is the encryption algorithm. Normally the operation of this algorithm depends on an encryption key, which is input to the algorithm together with the message. In order that the recipient can obtain the message from the cryptogram there has to be a decryption algorithm which, when used with the appropriate decryption key, reproduces the plaintext from the ciphertext.
Key – information that will allow someone to encipher the plaintext and also decipher the cipher text
Here we move the key through a different secure channel from the sender to the receiver. While, the encryption and the decryption functions are kept open to the public.
Equations:
Encryption equation y = eK(x)
Decryption equation x = dK(y) Encryption and decryption are inverse operations if the same key K is used on both sides.
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