DP를 이용한 병렬 프로그래밍에 관한 연구 ( A Study on the Distributed Proceses for Concurrent Programming )

오병균,박찬정,신인철,이상범 대한전자공학회 1987 대한전자공학회 학술대회 Vol.1987 No.7

분산 시스템에서 개선된 O(logN) 상호배제 알고리즘 제안

송권수,오병균 木浦大學校 情報産業硏究所 1993 情報産業硏究誌 Vol.1 No.-

본 논문은 분산 시스템에서 수행시간이 O(logN)으로 개선된 토큰 중심의 상호배제 알고리즘을 제안하였다. 이 알고리즘에서, 논리적 트리는 완전 연결(fully connected) 네트워크를 유지하며, 루트(Root)는 메세지 전송이 없을때 병행 요청 사이트들 가운데 토큰을 갖는 마지막 사이트이다. 사이트가 상호배제를 필요로 할 때, 그사이트는 토큰을 갖을 수 있는 사이트에 요청 메세지를 보내는 작업을 요청 메세지가 Root에 도착할 때까지 계속해 나간다. 따라서, 토큰을 탐색하는 메세지의 수는 Root에 도달하는 길(path)의 사이트 수에 비례한다. 토큰의 탐색속도를 향상시키기 위하여 알고리즘은 논리적 트리의 높이(hight)를 줄인다. 알고리즘의 메세지 수행시간은 N이 사이트의 수 일때 가벼운 traffic에서는 O(logN)이고, 복잡한 traffic에서는 3개를 감소한다. 본 알고리즘의 중요한 특성은 분산된 큐자료 구조를 사용하며, 이 구조는 토큰으로 자료 구조를 간단히 할 뿐 아니라 타임스탬프나 무한 수열의 사용을 제거하므로 신뢰도를 높여준다. In this paper, we present an O(logN) token-based mutual exclusion algorithm for distributed systems. In the algorithm, a logical tree is maintained in a fully connected network, and the root is the last site to get the token among the current requesting sites when no message is in transmission. When a site invokes mutual exclusion, it send its request to the site possibly holding the token. The request is continuously forwarded until it arrives at the root. Therefore, the number of messages for the search of the token is proportional to the number of sites on the path leading to the root. To speed up the research for the token, the algorithm reduces the hight of the logical tree. The message complexity of the algorithm is O(logN) in light traffic, where N is the number of sites, and is reduced to three in the heavy traffic. An interesting characteristic of the algorithm is the use of distributed queue data structure. The distributed queue data structure simplifies the data structure in the token, dispenses with the use of unbounded sequence numbers or timestamps, and provides a high degree of reliability.

통계적 방법을 이용한 MR 영상의 조직 분류

임희자,송주환,오병균 木浦大學校基礎科學硏究所 1998 基礎科學硏究誌 Vol.16 No.-

We describe a segmentation of head MR images using the statistical method. This comprises five stages, such as user interactive identification of tissue classes, calculation of a probability distribution for each tissues, segmentation of MR images using the probability distribution, interpolation of the segmented MR Images, and Rendering. We segment a head MR image into four sorts of tissues, such as air, face, brain, and CSF. MRI can generate three types of MR images, such as PD(proton density), T1(spin-lattice relaxation time), and T2(spin-spin relaxation time). We calculate mean, variance, correlation from sample point of two images among the three types of images, - in results, because PD and T2 correlation is the largest one of them, we use PD and T2 MR images -and we acquire the bivariate normal probability distribution for each tissues using those. MR images are segmented using the bivariate normal probability distribution into each tissues.

효율적인 네트워크 관리를 위한 사용자 인터페이스에 관한 연구

김만택,송권수,오병균 木浦大學校 情報産業硏究所 1995 情報産業硏究誌 Vol.3 No.-

Network management provides us with configuration management function, fault management function, performance management function, account management function, and security management function. A good Graphical User Interface(GUI) has been requested for users or network managers to monitor networking and to correct problems. In this thesisr, We design and implement GUI for a network management protocol used in the heterogeneous distributed environment. The designed GUI is developed by using Motif. Users easily select the managed object on the graphical map and execute commands through pulldown menus that are controlled by MWM. Our SNMP API provided access to MIB table to perform management operations, to set up the agent, and to include functions that return values of MIB.

전자 상거래 환경을 위한 인터넷 쇼핑 서비스의 설계

이상돈,오병균 木浦大學校基礎科學硏究所 1997 基礎科學硏究誌 Vol.15 No.-

This paper describes a design of an internet shopping system. As a component of electronic commerce environments, the role of computer-mediated shopping service is very important. This paper describes the relationships between the electronic commerce and the internet shopping service. After characterizing the requirements of an internet shopping service, it describes the system architecture and the necessary functions to support internet commerce applications. It also describes issues to provide flexible user interfaces for an internet-based commerce system.

벼 현탁배양을 통하여 분리된 원형질체로부터 식물체 재분화

정병균(Byung Gyun Jung),안준철(Jun Cheul Ahn),고경민(Kyeong Min Ko),김영준(Young Jun Kim),황성진(Sung Jin Hwang),황백(Baik Hwang) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.3

Plant regeneration was accomplished from protoplast culture of rice (Oryza sativa L., cv. Taebaeg). Embryogenic callus was induced from mature seed on MS medium containing 5 mM proline, 2.5 mg/L 2,4-D, 30 g/L sucrose in the dark at 28℃ and used to establish embryogenic cell suspension culture. Suspension cells were subcultured every one week in N6 medium supplemented with 5 mM proline, 200 mg/L casein hydrolysate, 2.5 mg/L 2,4-D and amino acids of AA medium. Suspension cultures were composed of cells that were densely cytoplasmic, potentially embryogenic and were at least maintained for more than 6 months in liquid medium. Protoplasts were isolated from fast-growing suspension culture cells and cultured in a slightly modified KpR medium by mixed nurse culture. Isolated protoplasts began to divide within 5∼7 days and thereafter, protoplast-derived calli were sequentially transferred to callus proliferating medium that soft agar MS medium contained 2㎎/L 2,4-D and produced distinct embryogenic cells. Microcolonies were then transferred to solid medium which consisted of MS medium containing 5 mg/L kinetin, 1 mg/L NAA, 1 mg/L ABA, 30 g/L sucrose and 10 g/L sorbitol under fluorescent light. Multiple shoots of 4∼5 per callus emerged and were transeferred to hormone-free MS medium for root initiation. Thereafter, The plantlets were transferred to pots of soil to mature in the culture room.

곡물류의 형질전환 유도에 관한 연구 (4) - 벼 배발생 세포의 생화학적 특징

정병균(Byung Kyun Jung),송정원(Jeong Won Song),임형탁(Hyoung Tak Im),남백희(Baek Hie Nahm),황백(Baik Hwang) 한국식물학회 1993 Journal of Plant Biology Vol.36 No.4

Rice (Oryza sativa L.) calli containing both embryogenic callus (EC) and nonembryogenic callus (NEC) regions were initiated from the mature seed on MS medium supplemented with 2.0 mg/L 2,4-D, 0.5 mg/L kinetin. The calli were developed into two callus type which can be distinguished by visual examination depending on color and appearance. In order to illucidate the polypeptide composition between EC and NEC, the total protein extracted from two types of callus was analysed by electrophoresis. By one-dimesional analysis of SDS-PAGE and Isoelectric focusing, several protein bands showed quantitative and qualitative difference in each type of callus. The further analysis of the total protein with two-dimensional electrophoresis showed at least 20 EC specific protein and 10 NE specific protein. Also 3 specific protein spots showing microheterogeneity of 90, 65, 50 kD were detected in EC, while a series of acidic heterologous protein spots were visualized in NEC.

중간에너지 사용에 적합한 액화 He-3 표적핵의 설계

안병균 충북대학교 과학교육연구소 1982 과학교육연구논총 Vol.1 No.1

陽生子 加速器인 180~525 Mev의 에너지 영역을 갖는 TRIUMF Cyclotron을 使用하여 標的核 液化 ^3Hesystem을 구조하는 것은 核反應 實驗上 중요한 일이다. 원통형 표적함 ( 4.4 ㎝ diameter, 1.6 ㎝ thick )에 ^4He를 ~1.6 K 정도로 빙점조정장치에 의해 ^3He 의 液狀을 유지하고 中間에너지를 갖는 陽性子에 적합한 ~2.7 × 10^22He-3 nnlei/㎠(128 ㎎/㎠)의 areal target density로 核反應을 일으킬 수 있게 한다.

간내담석증 치료로서의 간절제술

고병균,최건무,박광민,조영규,조용필,전장용,우돈희,이영주,이승규,민병철 대한외과학회 1996 대한외과학회 학술대회 초록집 Vol.1996 No.5

한국 - 일본의 원자핵 에너지 개발(開發)

안병균 충북대학교 과학교육연구소 2000 과학교육연구논총 Vol.16 No.1

Energy is a fundamental source in our daily lives. Energy is the lifeblood of our societies and modernization is entirely dependent upon energy and the basis of a nation's economic growth and human welfare, as well as its national security. Fossil fuels such as oil and coal are now used conveniently. It is expected that if fossil fuels are used without discretion as new, those will be exhausted in the future due to the world's limited reserves of fossil fuels. Worse still, the use of valuable fossil fuels without constraint by humans all over the world will cause environmental problems such as greenhouse effect and acid rain. Human life can be threatened by environmental issues. The most practical alternative energy is nuclear energy which is the ultimate solution to the problem of both limited fossil fuels and environmental issues. Recognizing the benefits of nuclear energy, Korea with poor natural resources, has been an active promoter of its nuclear power programs ever since it introduced nuclear power as a new source of generating electricity in 1978. Nuclear power is the most reliable means of generating electricity, improving human life and a nation's economic growth. Along with power generation, nuclear energy has been widely used for medical, agricultural and industrial purposes, making quality products and improving public health. The peaceful applications of nuclear energy! It is used for developing the nation's economy and improving public welfare. Nuclear energy brings us the promise of a prosperous world.