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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.
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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.
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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.
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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.
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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.
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주택정원 조성 및 유지관리의 실태와 개선방안에 대한 기초조사 - 충청북도 괴산군 일대를 중심으로 -
유병균,염성진,Yoo, Byeong-Gyun,Yeom, Sung-Jin 한국환경과학회 2021 한국환경과학회지 Vol.30 No.9
Gardens are known to provide relaxation, including psychological stability and mental rest. Recently, social interest in gardens has been growing in various ways, including the increase of groups sensitive to environmental pollution and a rising interest in the overall management of natural resources. In reality, however, the owners of housing gardens lack fundamental knowledge for creating and maintaining the gardens, directly and indirectly. This limitation presents a number of problems and challenges. Therefore, this study conducted an analysis of various aspects relating to the creation and maintenance of housing gardens, reflecting the sense of ownership. The study aimed to examine the current status, and based on this, it was intended to present improvement measures for practical and efficient creation of housing gardens and their maintenance in the future.
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