Apache Giraph – From installation to Example execution

In this article, let me look into Apache Giraph and let’s run the example “SimpleShortestPathsComputation” First, look at the introduction of Giraph (http://giraph.apache.org/) Welcome to Apache Giraph! Apache Giraph is an iterative graph processing system built for high scalability. For example, it is currently used at Facebook to analyze the social graph formed by users and their… Read More »

71 total views, 3 views today

SSH / Key Setup for Seamless Authentication among AWS EC2 Servers

Prerequisite – In this post, it is supposed the EC servers to be exists the topic is related to the SSHD/SSH & Key concept Conditions – It is supposed that There are two EC servers The account of each server is default account, “ec2-user” URL of each server is ec1.compute.amazonaws.com, ec2.compute.amazonaws.com The default pem provided from AWS to… Read More »

665 total views, 2 views today

Data Mining Algorithm List Tree

related material: 『Data Mining』-written by Ian H. Witten Basic Data Mining Algorithm ├───Basic rule extraction: 1R ├───Statistical modeling: Simple Bayesian, Gaussian/Normal distribution (Numeric) ├───Divide-and-conquer method: decision trees ├───Association rule mining ├───Linear Model │               ├Mathmatical Prediction: Linear Regression │               ├Linear Category: Logistic Regression │… Read More »

420 total views, 3 views today

GMAIL SMTP Relay Test using openssl(Windows Environment)

텔넷을 사용하여 SMTP 통신 테스트 방법(SMTP Test over Telnet) How to send email using simple SMTP commands via Gmail? 윈도우 openssl 설치(Installing openssl for windows) OpenSSL for Windows: Download Open the command window and go to the bin folder under the openssl downloaded run commands below

or

Then test to send email using… Read More »

500 total views, 4 views today

Terms-C4.5(Pseudo Decision Tree Guidance System)

related material: 『Data Mining』-written by Ian H. Witten Category: Divide and conquer technique: Decision Tree Divide and conquer algorithms for Decision Tree So called “Top-down Pseudo Decision Tree Guidance Method Developed & improved J.Ross Quinlan(wiki)  The scheme based on the information gain is identical with the ID3 scheme basically The scheme which use the gain ratio is… Read More »

461 total views, 2 views today

Terms-Information gain ratio

related material: 『Data Mining』-written by Ian H. Witten Category: Divide and conquer technique: Decision Tree Information Gain Ratio : In Decision Tree structure, the creation of child node for a property is decided by the most biggest information gain. But the information gain is tend to prefer the property from which the more properties can be… Read More »

592 total views, 3 views today

Terms – information, bit

related material: 『Data Mining』-written by Ian H, Witten Category: Divide and conquer technique Information Caculating (Decision Tree) Rules yes or no: one of both is 0 – information value = 0 yes & no: Same number –  max information value Information follows multistage property For instance, in case of info([2,3,4]) , a data might belonged to… Read More »

508 total views, 2 views today

(한국어) [Poet] 절망

Sorry, this entry is only available in Korean. 480 total views, 3 views today

480 total views, 3 views today

B2 Setup with Spring

1. Source Loading -> Tomcat load web.xml initially. 2. web.xml 2.1 filters loaded -> Spring Configuration Load * Several DispatcherServlet could be loaded order by the load-on-startup value (precedent check),cause corresponding to the servlet mapping can take part of front-end controller 2.2. Set dispatcher URI 2.3. dispatcher for backend (Refer to the ContextLoaderListener) 3. web.xml… Read More »

981 total views, 6 views today

Workbench/J – Installing and Setup in Command Line

Integration between database & systems usually requires some multi purposed tool, which provides some way to implement the automation like the command line interface, batch commands and so forth. In such a case, Workbench/j could be a useful tool for that. By this tool, you can do anything what you want, so it’s one of… Read More »

969 total views, 3 views today