다중센서 환경에서 공중표적 데이타의 연계

정진영,우영운,고봉홍,김재희,홍인표,조동래 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.2

In the system using one sensor, to describe accurate situation or conclude from information of one source in difficult. Moreover, sensor noise degrades the belief of decision. Multisensor information system, however, can increase the belief of date by imploying more than one source of information simultaneously. Another advantage of the system is that it can accomplish its task with other sources of information when one source malfunctions. In this paper, we implemented data association methods to identity moving flight targets using distance, probability theory, Dempster-Shafter theory for the low level process in the information fusion system. Data association is to classify information from various sources into data groups depending for the same flight object. Times and errors of these data association methods are analyzed.

An Efficient Search Method and its Application to the Planning of Airport Loading Bridge Assignments

Jai Hie Kim,Ji Soo Shon 대한전자공학회 1987 TENCON 87 - Computers and Communications Technolog Vol.- No.-

탐색트리의 축소기법과 공항 탑승교 배정업무에의 응용

김재희(Jai Hie Kim) 한국정보과학회 1989 정보과학회논문지 Vol.16 No.6

이 연구에서는 인공지능에서 이루어지는 상태공간 탐색에 있어서 전반적으로 채택되어질 수 있는 탐색트리의 축소기법에 대하여 논의하였다. 이 기법은 생성되는 탐색트리의 최대깊이와 확장되기 위하여 남아있는 노드들의 최대 갯수에 대하여 제한을 두는 방법으로써, 이의 적용에 따른 결과의 탐색 노력량과 얻어지는 해의 양호성에 대하여 분석하였다. 이 기법에 따라 고전적인 균일비용 탐색방법을 변형하여 공항에서 행하여지는 탑승교 배정업무에 적용하였다. This paper describes a search tree reduction method applicable to most state-space problems in artificial intelligence. The method limits the depth of a growing search tree and the maximum number of nodes remaining to be expanded, and its effects on total search efforts and resulting solution paths are analyzed. The classical uniform-cost search is modified by this method to be applied to a planning problem for the airport loading bridge assignments.

필기의 구조적 표현에 의한 온라인 자동 서명 검증 기법

김성훈(Kim Seong Hoon),장문익(Jang Moon IK),김재희(Kim Jai Hie) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.11

For on-line signature verification, the local shape of a signature is an important information. The current approached, in which signatures are represented into a function of time or a feature vector without regarding of local shape, have not used the various features of local shapes, for example, local variation of a signer, local complexity of signature or local difficulty of forger, and etc. In this paper, we propose a new technique for on-line signature verification based on a structural signature representation so as to analyze local shape and to make a selection of important local parts in matching process. That is, based on a structural representation of signature, a technique of local weighting and personalized decision threshold is newly introduced and its experimental results under different conditions are compared.

Comparisons of Two Camera Configurations for Remote Iris Recognition

Dong Ik Kim,Hyun Su Jo,Gen Li,Ho Gi Jung,Kang Ryoung Park,Jai Hie Kim 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

Although iris recognition is one of the biometric techniques that showing good performance, it is not been used widely because iris image capturing needs much effort in practical situation. Thus iris image acquisition in user convenient environment is very important factor for the popularization of iris recognition. Generally, remote iris acquisition system has two cameras: scene camera for user detection and iris camera for high resolution iris image capturing. According to the geometric relation between the scene camera and iris camera, remote iris image acquisition system could be classified into three categories: separated type, parallel type and coaxial type. In particular, this paper focused on the comparison between parallel type and coaxial type in the viewpoint of y-axis displacement, yoffset. Experimental results show that if camera to target distance is getting away, the yoffset is getting smaller. It means that benefit of coaxial type is limited to the near distance and difference between coaxial type and parallel type becomes ignorable beyond a certain distance.

An Obstacle Detection and Avoidance Method for Mobile Robot Using a Stereo Camera Combined with a Laser Slit

Chul-Ho Kim,Taigun Lee,Sung-Kee Park,Jai-Hie Kim 제어로봇시스템학회 2003 제어로봇시스템학회 국제학술대회 논문집 Vol.2003 No.10

3세대 단말기에서 대화형 비디오 서비스를 위한 H.264/AVC에서 FMO분석

김유수(Yu-Su Kim),정우석(Woo-Suk Jung),김재희(Jai-Hie Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7

When use FMO by error resilience purpose in existing TYPE1~2 compare. But, in This paper, TYPE 3-5[Gradual decoder refresh tool] is used as error resilence tool. Experiment result, it shows that Y PSNR improves that use suitable TYPE's FMO. Images using in an experiment had better use Type 3~5. Differ with existing paper, dipersed mode appeared result badly. Because spatial correlation is low, acted adversely in intra predication.

자가팽창성 식도 금속스텐트의 역학적 특성 분석

박재홍,김윤배,홍대희,전훈재,현진해,이규백,문태균 대한소화기내시경학회 2001 Clinical Endoscopy Vol.23 No.2

Backgound/Aims: One of the most important mechan- ical properties to consider in selecting clinically optimal stents would be expansile pressure. However, there were scanty data about the expansile pressure of stents. Furthermore, the data were improper for the clinical selection of stents. In this study, the authors tried to develop a precise and reproducible expansile pressure measurement method and to measure the expansile pressure of a variety of stent types. Methods: We developed a new method of expansile force measurement using a cylindrical measurement device under a quasi-static equilibrium state and measured the expansile forces of six different stents made by various manufacturers; covered and uncovered Y2P SR^(R), covered Y3E SR^(R) (Stentech, Korea), covered and uncovered Ultraflex^(R) and uncovered Wallstent (Boston Scientific, USA) Results: Three important points critical in explaining and predicting the expansion characteristics of stents were found. Firstly, the radial expansion force varies greatly among the types of stents. Secondly, stents could be categorized to 'soft stent$quot; and $quot;stiff stent based upon the slope of expansion force change. Lastly, the initial force needed to compress the fully expanded stents is far greater in stents covered with membrane compared with the stents without membrane. Conclusions: The newly developed method of measurement helped the authors to get more realistic data of expansion force and pressure, which are thought to be helpful in clinical selection of stent type.

ATMS를 이용한 모순 정보의 검출 및 제거에 관한 연구

우영운,박충식,김재희 한국전문가시스템학회 1998 학술대회 Vol.1 No.1

In this paper, a new method is proposed for detecting and removing contradictory information without domain knowledge by using ATMS(Assumption-based Truth Maintenance) method. The proposed method is tested by the problem of determining an aircraft's intent when the aircraft is flying with generating intentional contradictory informations. The results show that the proposed method is useful.

의미 네트워크 변환에 의한 생성 시스템의 추론속도 향상

이상윤(Sang Yun Lee),김재희(Jai Hie Kim) 한국정보과학회 1990 정보과학회논문지 Vol.17 No.1

A practical production system typically containing more than hundreds of production rules, spends most of its processing time to the selection of rules to be executed. In this paper, a method to reduce the rule selection time is described. This method is based on the conversion of production rules into a semantic network format in which rule relationships are explicitly represented. A subset of the EMYCIN, a commercial expert system building tool was used to build an experimental production system. In this study, the production system is converted to the proposed semantic network format by an automatic converter. For the further reduction of inference time, a rule selection algorithm requiting no working memory was proposed. 실용적인 생성시스템(production system)은 최종적인 추론결과를 제시할 때까지 현상태를 만족시키는 규칙(rule)을 찾는데에 시간의 대부분을 소비한다. 본 논문에서는 이러한 규칙 선택시간을 줄이는 방안으로써 주어진 생성시스템의 규칙을 의미 네트워크(semantic network)의 형태로 변환하고 이를 이용하여 추론하는 방법을 제시하였다. 변환을 위한 규칙의 형태는 전문시스템 개발도구인 EMYCIN의 주요부분을 설정하여 실용성을 보였으며, 이를 의미 네트워크로 자동변환하는 방법을 구현하였다. 또한 생성시스템에서 현상태를 나타내기 위하여 본질적으로 내포되는 작업메모리(working memory)를 사용하지 않으므로써, 보디 추론시간의 단축을 기하는 추론 알고리듬을 제시하였다. 변환에 의한 추론속도의 비교를 위하여 재래 방법, 필터형 방법, Rete형 방법으로 추론한 시간을 측정하여 이를 의미 네트워크로 변환하여 추론한 시간과 비교하였다. 실험결과 실용적인 시스템으로 볼 수 있는 500개의 규칙을 가진 시스템에서, 본 연구에서 제시한 방식의 추론시간이 재래방법, 필터형방법, Rete형 방법에 대해서 각 0.6%, 12.5%, 45.5%의 비율로 감소되었다. 반면에 메모리의 소비는 450%, 420%,150%의 비율로 증가하였다.