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GML 문서 저장을 위한 저장 스키마 및 하부 저장 시스템의 설계
김영국(Youngguk Kim),장재우(Jaewoo Chang) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.2
현재 활발하게 진행 중인 공간 네트워크 데이터베이스 연구는 지리 정보의 교환 표준으로 제시된 GML(Geographic Markup Language)을 지원하는 연구가 거의 없는 실정이다. 하지만 LBS 또는 텔레매틱스 응용에서, 시간에 따라 위치가 변화하는 이동 객체를 표현하는 데 있어 GML의 활용도가 크게 증가하고 있다. 또한, 공간 네트워크 데이터베이스 연구 대부분이 인코딩 표준인 GML 로 작성된 데이터들을 다룰 수 없어, 각 연구에서 사용하는 저장 시스템은 범용화되기 어렵다. 이에 따라 범용성을 지닌 GML 지원 저장 시스템 개발이 필수적이다. 본 논문에서는 범용성을 지닌 GML 문서 저장을 위한 저장 스키마 및 하부 저장 시스템을 설계한다.
순서정보및 Materialization 기법을 이용한 최근접 질의처리 알고리즘의 설계 및 구현
김영국(Youngguk Kim),김용기(Yongki Kim),김영창(Youngchang Kim),장재우(Jaewoo Chang) 한국정보과학회 2005 한국정보과학회 학술발표논문집 Vol.32 No.1
최근 LBS(location-based service) 및 텔레매틱스(telematics) 응용의 효과적인 지원을 위해, 이상적인 유클리디언(Euclidean) 공간 대신, 실제 도로나 철도와 같은 공간 네트워크(network)를 고려한 연구가 활발하게 수행중이다. 본 논문에서는 공간 네트워크를 고려한 기존 k-최근접 질의 처리 알고리즘의 문제점을 제시하고, 공간 네트워크 데이터베이스에 보다 효율적인 새로운 k-최근접 질의 처리 알고리즘을 제안한다. 제안하는 질의처리 알고리즘은 순서정보 및 Materialization 기법에 근거하며 기존 방법의 검색 성능을 향상시킨 방법이다. 마지막으로 제안하는 k-최근접 알고리즘을 기존의 알고리즘과 성능 비교를 수행한다.
김석원(Seogwon Kim),김영국(Youngguk Kim),한영재(Youngjae Han),박찬경(Chankyoung Park),김진환(Jinhwan Kim),백광선(Kwangsun Baik) 한국철도학회 2002 철도저널 Vol.5 No.3
In this paper, we introduce the software and hardware of the measurement system for on-line testing and evaluation of high speed railway. The test items focus on the verification of the performance and acquirement of the technical data of the high speed railway system. The software controls the hardware of the measurement system, perform the analysis and calculation of measurement data and acts as interface between users and the system hardware. For this purpose, three programs a measuring program, a monitoring program and post-processing program are developed. The detailed test scenario is in the process of development to closely follow the process of development and design of the system.
윤지원(Yoon Jiwon),김남포(Kim Nampo),김영국(Kim Youngguk),김석원(Kim Seog-Won),박태원(Park Taewon) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
The tilting train is able to tilt its body towards the center of the turning radius, preventing roll-over of the train as it runs on a curved rail at high-speed. This train, widely accepted for commercial purpose internationally is very beneficial in that the operating time is shortened without much capital investment to the infrastructure where there are many curved rails. Over several years, the Korea Railroad Research Institute(KRRI) has developed such a train. In this paper, the safety of the Korean tilting train express(TTX) is investigated using a dynamic simulation model. Since, proper safety standards have not been established for the TTX, those for the Korean train express(KTX) is employed instead to analyze the safety and ride comfort of the TTX. This study will prove useful in predicting the behavior of the TTX and ride comfort, and conforming that designed TTX measures up to the safety standards. It would be useful to recommend proper normal operating speed and determine the maximum safety speed, according to the result. Furthermore, it would be possible to provide basic reference data when analyzing the dynamic effect of the catenary system and the fatigue of the bogie.
한국형 고속전철의 현가장치 최적설계를 위한 반응표면모델과 유전자 알고리즘 모델에 관한 연구
박찬경(Chankyoung Park),김영국(Youngguk Kim),김기환(Kiwhan Kim),배대성(Daesung Bae) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
In design of suspension system for KHST, it was applied the approximated optimization method using meta-models which called Response Surface Model and Neural Network Model for 29 design variables and 46 performance index. These models was coded using correlation between design variables and performance indices that is made by the 66 times iterative execution through the design of experimental table consisted orthogonal array L32 and D-Optimal design table. The results show that the optimization process is very efficient and simply applicable for complex mechanical system such as railway vehicle system. Also it was compared with the sensitivity of some design variables in order to know the characteristics of two models. This paper describes the general method for dynamic analysis and design process of railway vehicle system applied to KHST development, and proposed the efficient methods for vibration mode analysis process dealing with test data and the function based approximation method using meta-model applicable for a complex mechanical system. This method will be able to apply to the other railway vehicle system in oder to systematize and generalize the design process of railway vehicle dynamic system.
한국형 고속전철의 주행시험을 통한 진동 모드 분석 연구
박찬경(Chankyoung Park),김영국(Youngguk Kim),김석원(Seogwon Kim),김기환(Kihwan Kim) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Korean High Speed Train (KHST) has been tested on high speed line in JungBu site since it was developed in 2002. The data acquisition system was used to test successfully the on-line test for proving the dynamic performance of KHST. The recognition of system vibration mode for railway vehicle is essential to understand the characteristics of design for dynamic system and diagnose the dynamic problems of vehicle system during test and operation. But, up to now, there are the efforts to know the system vibration mode within limit of theoretical field only, not experimental approach with systematic method. The theoretical results are too reliable to apply to real design problem, because it is theoretically based on the homogeneous linear system although the real system have the nonlinear characteristics and vary the environmental conditions. Therefor, in this paper, it is proposed the efficient method of vibration analysis for rail vehicle system and this method apply to KHST to recognize the vibration mode characteristics of it. The results show that this method is able to make the system vibration modes for KHST clear.
박찬경(Chankyoung Park),김석원(Seogwon Kim),김영국(Youngguk Kim),목진용(Jinyong Mok) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-
Korean High Speed Train (KHST) has been tested on high speed line in JungBu site since it was developed in 2002. The KHST figured 7 cars was modeled for dynamic simulation with Vampire program. and the data acquisition system was used to test successfully the on-line test for proving the dynamic performance of KHST. The comparison between test and simulation results for dynamic behavior of KHST was tried in this paper and it was very difficult because the environmental conditions and running conditions have an effect on the test results and these conditions are unable to be modeled for dynamic analysis. Also the parameters for data acquisition system for test are usually not same to simulation conditions. Therefor, in this paper the acceleration data after filtering with low pass filter below 1㎐ were used to compare between test and simulation results because the low frequency range is useful to evaluate the dynamic performance for railway vehicle system, so as steady state curving acceleration. The results show that both are similar in low frequency range.
한국형 고속전철의 350Km/h 주행에 대한 진동 가속도 분석
박찬경(Chankyoung Park),김기환(Kiwhan Kim),목진용(JinYong Mok),김영국(Youngguk Kim),김석원(Seogwon Kim) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The characteristics of dynamic vibration are generally analyzed by an acceleration of a car body of high speed train and the acceleration can be applied to evaluation of running safety. The test of process and the analysis method about it are well explained on UIC Code 518 OR which is the spacial international standard about running safety and dynamic behavior on the line test for railway vehicle. Korean High Speed Train designed to operate at speed 350㎞/h has been tested on high speed line since it was developed in 2002 and it recorded the highest speed 352.4㎞/h at the 16th Dec. 2004 in Korea. This paper includes the analysis of running behavior of this train at speed 350㎞/h and also the analysis of dynamic safety is presented in it, extending to the range of high speed while the UIC 518 limit the speed below 200㎞/h.