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안병현(Byunghyun Ahn),이혁준(Hyukjoon Lee),최용훈(Yonghoon Choi),정영욱(Younguk Chung) 한국정보과학회 2010 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.9
위젯은 자주 이용하는 서비스를 독립적으로 구동시키는 작은 응용프로그램으로서, 콘텐츠를 제공하는 웹 사이트 등을 직접 방문하지 않고도 사용자가 원하는 콘텐츠를 손쉽게 얻을 수 있어서 많은 관심을 끌고 있다. 이러한 위젯은 오픈 API를 이용하면 손쉽게 개발될 수 있다. 하지만 위젯의 다양한 응용 가능성에도 불구하고, 현재 오픈 API를 제공하는 웹 사이트가 많지 않다. 그 이유는 웹 사이트 운영자가 오픈 API를 제공하기 위해서는 기존의 웹 서버 구조를 변경하거나 웹 서버 리소스를 수정해야 하는 어려움이 있기 때문이다. 본 논문에서는 기존의 웹 서버 구조 또는 웹 서버 리소스를 변경하지 않고, 개발자가 위젯 개발을 가능하도록 하는 것은 물론, 사용자가 위젯을 사용할 수 있도록 웹 서버를 대신하여 오픈 API를 제공하는 오픈 API 프록시 서버 시스템을 제안한다. 오픈 API 프록시 서버 시스템의 구성은 크게 오픈 API 소스 코드 생성기와 오픈 API 프록시 서버로 이루어져 있다. 오픈 API 소스 코드 생성기는 사용자가 원하는 오픈 API를 생성하도록 사용자에게 GUI를 제공하여 오픈 API 프록시 서버로 오픈 API 소스 코드 생성 요청을 보내는 프로그램이다. 오픈 API 프록시 서버는 본 논문에서 제안하는 HTML 테이블 처리 라이브러리를 이용하여 웹 사이트로부터 HTML 웹 페이지를 받아서 대상 HTML 테이블로부터 유용한 정보를 추출한다. 그리고 이를 XML 문서로 가공하여 오픈 API를 통해 제공한다. 실제 웹 사이트의 HTML 테이블을 대상으로 실험하여 오픈 API 프록시 서버 시스템의 동작을 검증하였다. A widget is a small application running by the users’ favorite services, so they are provided with web contents without explicitly visiting the web site. Although widgets can be easily implemented with Open APIs, only a few web sites provide them because of refactoring the structures of web resource to supply Open APIs to the widget developers. This paper presents an Open API Proxy Server System for widget services. The system consists of two components: an Open API Source Code Generator and an Open API Proxy Server. The Open API Source Code Generator provides a Graphical User Interface (GUI) for users to generate the Open APIs of user's choice and sends the Open API source code generation request to the Open API Proxy Server. The Open API Proxy Server using the HTML Table Processing Library receives the HTML web page from web site and extracts useful information from the target HTML table. The proxy server converts the extracted data into the corresponding XML document which becomes available through the Open API. We verify the operation of the proposed system through experiments with the HTML tables in the example web sites.
김근수(Keunsoo Kim),안병현(Byunghyun Ahn),이승균(Seungkyun Lee) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The fuel pump should supply fuel to the engine during the all driving condition but in case of the high power turbo-GDI engine, it usually consumes lots of fuel at the high speed circuit driving condition. At this case of severe circuit driving condition, the fuel pump suction point is separated with fuel in the fuel tank because of excessive lateral acceleration. If the vehicle is driven wide open throttle driving after excessive lateral accelerations. This results in fuel pressure decrease, engine hesitation and stall due to lack of fuel in the fuel pump reservoir.
박동희(Donghee Park),안병현(Byunghyun Ahn),김효중(Hyojung Kim),하정민(Jeongmin Ha),임강민(Gangmin Lim),최병근(Byeongkeun Choi) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.5
Ultrasound signal is widely used to detect fault by heterodyned signal. Typically an expert will scan around the object with the scanning module while listening through headphones and observing a display panel. But this diagnosis procedure is required by specialized expert and hardly detect early defect. In this paper, Feature selection based on GA (genetic algorithms) is selected from the features of ultrasound signal on frequency domain and time domain. Then, by using the Support Vector Machine one of the machine learning, the performance of classification is evaluated by extracted features and selected features. The results of classification is compared with feature extraction based on PCA (principal component analysis). Therefore, the feature selected for each defect can be used as a reference by feature analysis for ultrasound.
하정민(Jeongmin Ha),안병현(Byunghyun Ahn),유현탁(Hyeontak Yu),최병근(Byeongkeun Choi) 한국소음진동공학회 2017 한국소음진동공학회 논문집 Vol.27 No.2
An compressor that is combined with the rotor and pneumatic technology has been researching for the performance of pressure. However, the control of operations, an accurate diagnosis and the maintenance of compressor system are limited though the simple structure of compressor and compression are advantaged to reduce the energy. In this paper, the characteristic of the compressor operating under the normal or abnormal condition is realized. and the efficient diagnosis method is proposed through feature based analysis. Also, by using the GA (genetic algorithm) and SVM (support vector machine) of machine learning, the performance of feature analysis is conducted. Different misalignment mode of learning data for compressor is evaluated using the fault simulator. Therefore, feature based analysis is conducted considering misalignment mode of the compressor and the possibility of a diagnosis of misalignment is evaluated.
이종명(JongMyeong Lee),이정훈(JeongHoon Lee),하정민(JeongMin Ha),안병현(ByungHyun Ahn),구동식(DongSik Gu),최병근(ByeongKeun Choi) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
Water injection pump produced the 1st oil well through the high pressure after the Deep water oil well drilling. After finish the work it is hard to produce only using itself pressure due to low pressure. Therefore it can be increased recovery factor through the injection seawater of high pressure. Is the key equipment used in the marine plant and it is developing at many industries. In this paper, Analyze changes in the natural frequency due to the stiffness of the bearing. Analyze the critical speed of the natural frequency due to the change of operation speed. And evaluate the Stability. And then analyze the displacement and clearance through the unbalance response this way has contributed to the reliability of the developing product. Through a mathematical analysis.