이동통신시스템에서의 최적 위치 및 페이징영역

백천현,정용주,김후곤 한국경영과학회 2001 經營 科學 Vol.18 No.2

Mobility of service users makes Registration and Paging (R/P) procedures indispensable features in mobile communication networks. Importance of optimizing the configuration of R/P areas has been increased by the growth of R/P related signaling. Given the network topology (cell locations and adjacency between them) and R/P related traffics generated by each cell, we deal with the problem of finding optimal R/P areas minimizing the amount of R/P related signaling while the constraints on paging channel capacity and network configurations are satisfied.

貝類中의 重金屬 含量調査

韓天吉,全珍坤,金明姬 한국환경독성학회 1989 환경독성보건학회지 Vol.4 No.1

This survey was performed to find out the heavy metal concentrations in shellfishes. Experimental subjects were 60 cases in 10 kinds of shellfishes purchased in markets in july, august, 1987 and february, 1988. Contents of lead, cadmium, zinc, copper and mangangese were determined by atomic absorption spectrophotometer and mercury contents by mercury analyzer. The results were as follows: The range of mercury contents in shellfishes was from ND to 0.22 ppm, cadmium from 0.22 to 2.46 ppm, lead from 0.09 to 4.90 ppm, copper from 0.62 to 12.45 ppm, manganese from 0.09 to 13.8 ppm and zinc from 4.01 to 129.96 ppm.

WDM 링에서의 루팅 및 파장할당에 관한 연구

김후곤,백천현,정용주 한국경영과학회 2002 韓國經營科學會誌 Vol.27 No.4

The ring routing and wavelength assignment problem arose in the planning of optical communication networks which use WDM rings. Traffic demands are given for each pair of nodes in an ring: each demand must be routed one of the two possible connections round the ring and the wavelength assignments must be made so that there are no conflicts: That is, no two connections whose routes share a link can be assigned the same wavelength along that link. The objective is to minimize the number of used wavelengths. We propose the local optimal routing for the problem and show that there always exists an optimal solution satisfying it. Furthermore we suggest a new lower bound for the problem and show that it is very efficient for the worst case example.

α- 메틸스티렌 이량체의 촉매분해반응

박천관,김종호,서곤 전남대학교 촉매연구소 2000 觸媒硏究 論文集 Vol.21 No.-

Decomposition of α -methylstyrene dimer was studied over acid and base catalysts relating to their acidity and basicity. High conversion was obtained over KIT-1 mesoporous material with a large amount of hydroxyl group compared to strong acid and base catalysts. Dehydration and acid-base treatments of KIT-1 catalysts showed the strong contribution of hydroxyl group to the decomposition reaction. The role and characteristics of hydroxyl group as an active site for the decomposition of α-methylstyrene dimer was discussed.

메조포러스 물질의 세공크기 조절

박천관,김종호,서곤 全南大學校 觸媒硏究所 1998 觸媒硏究 論文集 Vol.20 No.-

The pore sizes of MCM-41 and KIT-1 mesoporous materials could be controlled by the addition of 1,3,5-trimethylbenzene as a complementary chemical or the use of templates with different chain lengths such as ?? and ??. The synthesized mesoporous materials are characterized from X-ray diffraction patterns and N₂adsorption isotherms. With the addition of 1,3,5,-trimethylbenzene, the pore size of synthesized, mesoporous material increased, while the pore size distribution became broad. On the other hand, the mesoporous material synthesized using a template with a larger carbon chain such as ?? showed larger pore size with a narrow distribution.

심리적 자기-조절과 운동수행 향상에 관한 연구

조춘호,표내숙,최영곤 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.12 No.-

The purpose of this study was to eximine the mechanisms of self-regulation techniques and improvement of sport performance. First of all, In this study, It was expressed mechanisms of psychological self-regulation techniques sometimes regarded as mental practice or biofeedback to aid better understanding as to how these skills would produce performance improvement. Also, The psychological skill training can be successfully controlled through systematic mental skill training. The focus of mental skill training is to perform consistently to athlete's potential. The current study reviewed literature on mental skills which are essential in consistent sport performance. Most of mental training programs are self-instructional and convenient to use. Through many sport psychologist's studies, psychological self-regulation was demonstrated its effect on performance in sport fields. Also, The effectiveness of psychological self-regulation has been verified by performance tasks and methods. Accordingly, As using psychological self-regulation and mental training, it will be applied to some kinds of sport performance. Finally, Future directions for study in psychological self-regulation and mental training are required for systematic and scientific training program.

이동통신 멀티미디어 데이터서비스의 트래픽 특성 모델링 및 성능분석

정용주,백천현,김후곤,최택진,양원석,황흥석 한국경영과학회 2003 한국경영과학회지 Vol.28 No.2

The aim of this study is to identify the data traffic capacity of 3G mobile communication networks, especially of cdma2000-1X networks. Three-layered ON/OFF traffic model is used to describe the dynamics of data traffics and the process of data transmission such as packet scheduling. We construct a simulator fully incorporating packet handling process of cdma2000-1X data network as well as three-layered ON/OFF traffic model describing the behavior of source data traffics. To get influence of traffic parameters on performance measures, the extensive simulations were performed for several data sets which are obtained from real trace data or previous studies. The experimental results show that the engineered throughput satisfying QoS criteria is approximately 20% of total capacity. Finally, some proposals to improve the system capacity are followed.

카리스마적 리더십에 관한 연구

박종태,최영곤,한남익,박철용,표내숙,조춘호 釜山大學校 附設 體育科學硏究所 1998 體育科學硏究所 論文集 Vol.14 No.-

In the early decades of this century, Charisma which originally means endowment with the gift of grace, has been introduced to social sciences by German sociologist, Max Weber. It quickly became interested in the field of sociology and politics. But, into the 1970s, charismatic leadership still had not became a subject for empirical or experimental research related to organizational theory. Recently, much attention has been paid to charismatic leadership as the prototype of leadership that people have in mind when they describe their ideal leader and is more likely to provide a role model with which subordinates want to identify. As a result, in will perform further study related to Charisma leadership which developing various kind of measurement and instrument. Finally, it should identify lost of possibility and phenomenon through the study of charisma leadership.

晋州市 食品衛生 行政管理

최상도,강군중,김춘곤,정민화 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

1.진주시의 식품위생 행정의 담당 부서는 진주시 사회위생과 식품위생담당 이며 식품위생 업무를 담당하는 인력은 ‘98년 8월 현재, 보건직 8명, 행정직 1명, 기능직 1명, 총10명으로 구성되어 있고 市의 식품위생관리 대상 업소의 현황은 식품제조·가공업소가 595개소, 식품운반업소가 10개소, 식품판매업소가 1,071개소, 식품보존업소가 6개소, 용기포장 및 용기류 제조업소가 2개소, 총 1,684개소이다. 또한 식품접객업소는 5,355개소이며 집단급식소도 93개소이다. 2.식품의 안정성을 유지하기 위하여 식품제조·가공업소의 위생관리, 국민 다 소비식품의 수거 검사, 시중 유통식품의 관리, 부정·불량식품의 특별단속, 夏節氣 危??식품 및 盛需식품의 특별관리를 실시하고 있다. 3.일반음식점, 휴게음식점, 단란주점 및 유흥주점 등 식품접객업소들의 지속적인 위생관리 및 건전한 영업질서가 이루어지도록 행정관리를 시행하고 있다. 4.명예식품위생감시원제도 및 주민신고 보상금제도를 운영하며 식품위생의 수준 및 국민영양의 수준을 높이기 위한 식품진흥기금을 관리하고 있다. 또한 음식문화의 개선과 좋은 식단의 실천운동을 추진하고 있다. The present managements of sanitary administrative system of Chinju city including the general informations of hygiene administration, food safety control, management of food entertainment of food entertainment business, the honorary inspector of food sanitation and the compensation system for citizens` reporters were described. At present as of August 1998, the number of food entertainment business enrolled in the section of food sanitation under the social sanitary division of the city were 1,684. Total 10 public officials dealt with these fields of the food business. To maintain the foods safety, the section have operated the following the duties; the sanitary managements for food manufactories, collections and tests for dominant foods consumpted by the citizens, the managements of market foods, the special supervision on the fraudulent and substandard foods, the special managements for high demand or harm foods during summer season. To maintain the sanitary management of entertainment businesses including the general restaurants, rest rooms, wine shops, amusements continually and to do the public order for those businesses in good way, the administrative actions for sanitary management system were operated periodically. The section operated the systems of food sanitation inspecting and provided compensation for whom report wrong foods in the markets, distributions or manufactures. The sector also dealt with food promoting funds( - resources required to elevate the knowledge of food sanitation and the better nutrition - ) and drove forward for improvement of food cultures and good standard food menu for citizens.

주파수 선택성 다중경로 페이딩 채널에서 Near/Far 영향을 받는 Multi-Carrier CDMA Trellis Coded 16 QAM 시스템의 성능 해석

노재성,강희조,김춘길,김언곤,조성준 대전산업대학교 반도체기술연구소 2000 半導體技術硏究所報 Vol.2 No.-

본 논문에서는 주파수 선택성 다중경로 페이딩과 Near/Far 영향을 받는 Multi-Carrier CDMA 시스템의 성능을 분석하였다. 성능 분석을 위해 사용한 파라미터들은 Multi-Carrier의 수, 다중사용자의 수, RAKE 수신기의 가지수, 주파수 선택성 다중경로 페이딩의 감쇄지수, 그리고 CDMA 다중사용자의 분포와 세기이다. Multi-Carrier CDMA 시스템에서 Near/Far 영향을 분석하기 위하여 3가지의 간섭 분포 모델을 설정하였다. 첫 번째 모델은 다중사용자가 간섭과 대 반송파 비인 I/C를 -4 dB에서 4dB 사이에서 2dB씩의 차이를 가지며 20%씩 균일하게 분포하는 경우이다. 두 번째 모델은 다중사용자가 I/C 비를 -2 dB에서 2 dB 사잉에서 2 dB씩의 차이를 가지며 33.3%씩 균일하게 분포하는 경우이다. 그리고 세 번째 모델은 모든 다중사용자가 I/C가 0 dB로 신호 전력과 간섭 전력이 동일하게 분포하며 전력이 완전하게 제어된 경우이다. 그리고 본 논문에서는 주파수 선택성 다중경로 페이딩의 영향을 감소시키기 위하여 RAKE 수신기를 채용한 Multi-Carrier CDMA 시스템을 제안하였다. 이 시스템에서는 제시한 3가지의 간섭 분포 모델중에서 세 번째 모델(완전 전력제어가 된 경우)이 가장 좋은 성능을 나타내었고, 간섭파의 전력과 신호파의 전력차이가 적을수록 희망 신호에 영향을 주는 간섭 신호의 전력량이 적어서 Multi-Carrier CDMA 시스템의 성능이 향상됨을 알 수 있었다. The performance of a multi-carrier CDMA system is analyzed considering frequency selective multipath fading and Near/Far effects. The number of multicarrier, multiuser, and arms of RAKE receiver, and the decay ratio of frequency selective multipath fading are used as a parameter for the performance analysis. Moreover, the distribution and the strength of multiuser interference are also considered. To evaluate the Near/Far effects in a multi-carrier CDMA system, three distribution models are assumed. In the first model, Interference to Carrier Ratio, I/C, ranges from -4 dB to 4dB, and at each 2 dB interval, 20% of multiuser is assumed to be uniformly distributed. In the second one, I/C ranges from -2 dB to 2dB, and 33.3% of multiuser is assumed to be equally dispersed at each 2dB interval. The third model is 0 dB of I/c, that is, with perfect power control, multiuser are assumed to be evenly located. In this paper, multi-carrier CDMA system adopting RAKE receiver is proposed to mitigate the frequency selective multipath fading. From the results, the third model(i.e. perfect power control) shows the best perfomance, and the narrower range of I/C causes the less effects to the desired signal, which reads to the better performance.