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분산 환경에서 객체 라이프 사이클 관리 서비스의 설계 및 구현
선경섭(Kyungsup Sun),황재원(Jaewon Hwang),안순신(Sunshin An) 한국정보과학회 1997 정보과학회 컴퓨팅의 실제 논문지 Vol.3 No.6
분산처리 플랫폼에서 제공되는 기본적 서비스중의 하나인 객체 라이프 사이클 서비스는 객체의 배치, 생성, 제거 등에 관련된 기능을 규정한다. 본 논문에서는 네트워크 상에 널리 분산되어 있는 애플리케이션 객체들의 라이프 사이클을 관리하는 분산 객체 라이프 사이클 관리 서비스 모델을 정립하고 이러한 서비스의 설계 규격과 구현 방법을 기술한다. 본 논문에서 정의된 분산 객체 라이프 사이클 관리 서비스는 구성, 설치, 생성, 실행 관리 서비스로 이루어져 있으며 각각의 서비스는 차례대로 객체 구성 정보의 관리, 객체 템플릿(template)의 배치, 객체의 생성, 객체의 실행 관리를 담당한다. 서비스들은 각기 하나의 서버 객체로 구현되는 데 이들을 라이프 사이클 지원 서버라 하며, 라이프 사이클 관리 서비스는 라이프 사이클 서비스 관리자(LSM : Life-cycle Service Manager) 객체로 구현되어 앞서의 4 가지 서버를 이용한다. 또한 LSM은 외부적으로 트레이더(trader), 레포지토리(repository) 서버, 통지(notification) 서버와 같은 다른 플랫폼 서버들과 상호 작용함으로서 객체들의 라이프 사이클을 총괄적으로 관리한다. 라이프 사이클 서비스에 대한 연산 객체 레벨의 규격을 기술하기 위해서 OMG IDL을 사용하였으며, LSM 및 각각의 서버 객체들은 OMG CORBA 규격을 준수하는 분산 플랫폼 상에서 구현되었다. As a basic service which is provided by a distributed processing platform, object life-cycle service specifies functions for deploying, creating, and deleting objects. This paper defines a distributed object life-cycle management service that manages the life-cycle of the application objects which are widely distributed in the network and also presents design specification and implementation method of that service. The distributed object life-cycle management service consists of the configuration, installation, factory, and execution management service which is respectively responsible for configuration information management of an object and its template, deployment of an object template, creation of an object, and execution management of an object. Four services are implemented as four server objects which are called life-cycle supporting server and the life-cycle management service is implemented as the LSM(Life-cycle Service Manager) object which uses the above four servers. Also LSM interworks externally with other platform servers such as trader, repository server, and notification server. We have used the OMG IDL to describe the life-cycle management service specification at a computational object level and we have implemented all of the objects on the OMG CORBA-compliant platform.
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An Approach for Reducing Computational Time for Real-Time Autonomous Vehicle Tracking
TaeWook Hwang,Seonhee Kim,Sujeong Kim,Gilsang Jang,Jihye Park,Seongha Park,Eric T. Matson,Kyungsup Kim 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
Autonomous vehicles are familiar to public in daily life nowadays. For a recreational purpose, autonomous vehicles such as drones are commonly adopted for people. However with the easy accessibility, those autonomous vehicles can be a threat to anyone. Moreover, to detect and prevent those possible threats, real-time detection and tracking system is required. With the requirements, we propose a real-time communication between post-processing device and autonomous vehicle tracking sensor, which is a radar and a noise reduction method for post-processing. With the proposed method, a Frequency Modulated Continuous Wave (FMCW) radar can be utilized for real-time monitoring of autonomous vehicle. In this paper, we used an audio file recorded through a FMCW radar for distance tracking. The recorded audio data were processed by Inverse Fast Fourier Transformation (IFFT) and noise cancellation. We propose a data selection formula for faster IFFT processing and a noise reduction method in real-time communication. Also we propose a simple Android application to receive the processed data that sent to as distances of the target autonomous vehicle in time in real-time, so that a user can conveniently watch an autonomous vehicle near the radar.
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전송 안테나 및 성상도 선택과 전력 할당을 적용한 MIMO 다중 사용자 시스템의 성능분석
유현,김진수,황현철,김백현,이형기,곽경섭,Yoo Hyun,Kim JinSu,Hwang HyeonChyeol,Kim BaekHyun,Lee HyungKi,Kwak KyungSup 대한전자공학회 2005 電子工學會論文誌-TC (Telecommunications) Vol.42 No.9
In this paper, we suggest the scheme combining long-term feedback and short-term feedback in MIMO multi-user system and analyze its system performance. At the beginning of communication, long-term feedback is fed back to transmitter such as the number of active antennas, constellations, and transmission powers which are determined to satisfy the given target symbol error and target data rate for each user. After this, short-term feedback of active antenna index is fed back periodically Simulation results show the proposed scheme outperforms better than long-term feedback or short-term feedback information scheme. 본 논문에서 장시간 귀환 기법과 단시간 귀환 기법을 결합하는 MIMO 다중 사용자 시스템을 제안하고 성능을 분석하였다 통화 초기에 목표 심볼 오류와 목표 전송를을 고려하여 활성 안테나 수, 성상도, 전송 전력과 같은 장시간 귀환 기법을 수신단에서 전송단에 귀환한다. 이 후에 수신단에서 단시간귀환기법으로서 활성안테나 인덱스를 주기적으로 전송단에 알려준다. 모의실험을 통해 장시간 귀환 기법 또는 단시간 귀환 기법만을 적용하였을 경우보다 장시간 귀환 기법 방법에 단시간 귀환 기법을 적용하였을 경우에 우수한 성능 개선이 있음을 확인할 수 있었다.
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Mamun, Md. Iqbal Rouf,Park, Jong Hyouk,Choi, Jeong-Heui,Kim, Hee Kwon,Choi, Woo Jung,Han, Seong-Soo,Hwang, Kyungsup,Jang, Nam-IK,Assayed, Mohamed Ezzat,El-Dib, Mohamed Anwer,Shin, Ho-Chul,El-Aty, A. M WILEY-VCH Verlag 2009 Journal of Separation Science Vol.32 No.4
<P>Several methods used for the multiresidue analysis of pesticides from the environment and drinking water have been reported. However, most of these reports dealt with a small number of targeted pesticides or some special groups. A method that is simple, faster, and more cost-effective than the environmental protection agency (EPA) method has been developed for the analysis of 82 frequently used pesticides in water samples obtained from Yeongsan and Sumjin rivers, as well as rice fields located in various locations around the two rivers. The samples were extracted by dichloromethane, and the pesticides were analyzed using a GC-electron capture detector (ECD), followed by confirmation with GC-MS. Recoveries were found to be between 82 and 120.1% for most of the tested pesticides, which were in agreement with the standard values dictated by the EPA. The method was potentially applied to 66 water samples for human consumption and 90 water samples from the rice fields and irrigation ditches that were collected from June to September 2007. Oxadiazon, butachlor, and alachlor were detected in some of the river water samples collected in June, iprobenfos (IBP) was detected in samples collected in August, and no pesticide was detected in September. On the other hand, chlorpyrifos-methyl, IBP, hexaconazole, diazinon, oxadiazon, butachlor, and isoprothiolane were detected at relatively high concentrations in 48 rice paddy field water samples collected between June and September 2007. Alachlor in one sample and procymidone in some of the rice paddy field water samples were also detected in trace amounts. The results were consistent with the temporal pattern of pesticide application in Korean rice fields.</P>
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