• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.416-420
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• 2002

Traditional queueing analyses are very useful for designing a network's capacity and predicting there performances, however most of the predicted results from the queueing analyses are quite different from the realistic measured performance. And recent empirical studies on LAN, WAN and VBR traffic characteristics have indicated that the models used in the traditional Poisson assumption can't properly predict the real traffic properties due to under estimation of the long range dependence of network traffic and self-similarity In this parer self-similar characteristics over statistical approaches and real time network traffic measurements are estimated It is also shown that the self- similar traffic reflects network traffic characteristics by comparing source model.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.3
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• pp.393-398
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• 2002

This paper presents an effective policy of information telecommunication R & D infrastructure project. In order to survive the infinite competition in this fields, choice and concentration for national R & D play an important role. Results of this project are influenced potentially to the area of related field in contrast to technology R & D. In this approach, suck investigations as research environments, infrastructure, application of results are evaluated, and also verified that this project is essential to the small and medium enterprise.

• The Journal of Korean Medicine
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• v.24 no.1
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• pp.65-73
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• 2003

Objective: The aim of this study was to investigate the effect of scalp acupuncture on recovery from motor disorders in stroke patients. Methods: Twenty-two patients with post-stroke hemiplegia were randomized into two groups. Ten patients (test group) were treated by 2 methods: scalp acupuncture and general acupuncture. The other twelve patients (control group) were treated only with general acupuncture. The activity of daily living was measured with a National Institutes of Health stroke scale (NIHSS) and Modified Barthel Index (MBI). The therapy was performed once a day for 2 weeks. Results: In terms of NIHSS score, the test group showed statistically meaningful decrease after 2 weeks treatment, while the control group showed statistically meaningful decrease after 1 week (p<0.05). And in terms of score of MBI, the test group did not show statistically meaningful increase but the control group showed statistically meaningful increase after 1 week (p<0.05). There was no statistically meaningful difference after 1 and 2 weeks treatment between the groups. Conclusions: These results support that the test group has almost same the effectiveness compared with the control group in improvement of the activity of daily living of post-stroke hemiplegic patients.

• Water for future
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• v.28 no.6
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• pp.217-228
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• 1995

For optimal reservoir operation during flood period, a general and systematic policy is suggested to make balance of the conflicting purposes between water conservation and flood control. The purpose of this study is to decide the restricted water level of the reservoir during flood period specially to meet water demand in non-flood period. The optimal policy is derived by reallocation of storage capacity through the application of variable restricted water level(VRWL) and minimum required water level(MRWL) for shorter intervals. This study also suggests water level dconditions to secure conservation storage capacity at the end of the flood period estimated by reservoir operation study. This paper illustrates an application of the Daecheong Dam and Chungju Dam respectively during flood and the results are reviewed.

• Journal of Yeungnam Medical Science
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• v.4 no.1
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• pp.17-23
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• 1987

New born rat heart cells were dissociated using trypsin and/or collegenase to elucidate the dissociation efficiency of these two enzymes. And the effect of dimethyl sulfoxide during and immediately after cell dissociation was also investigated to clarify the so-called protective activity of dimethyl sulfoxide on cell performance. The results can be summarized as follows. 1. Cold trypsin 18 hours pretreatment followed by warm collagenase treatment resulted best cell viability and cell yield. 2. Single, warm trypsin treatment gave the poorest result. 3. Dimethyl sulfoxide did not seem to play any protective role during or immediately after rat heart cell dissociation. It had very damaging effect on rat heart cells.

• The Journal of the Korea Contents Association
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• v.5 no.3
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• pp.175-181
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• 2005

Recent measurements of local-area and wide-area traffic have shown that network traffic exhibits at a wide range of scales-Self-similarity. Self-similarity is expressed by long term dependency, this is contradictory concept with Poisson model that have relativity short term dependency. Therefore, first of all for design and dimensioning of next generation communication network, traffic model that are reflected burstness and self-similarity is required. Here self-similarity can be characterized by Hurst parameter. In this paper, when different many data traffic being integrated under various environments is arrived to communication network, Hurst Parameter's change is analyzed and compared with simulation results.

• Journal of the Korean Applied Science and Technology
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• v.37 no.2
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• pp.362-373
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• 2020

The purpose of this study is to verify the possibility of applying sports psychological training based on a solution-based short-term counseling approach. the study subject was a total of 8 units as one of the national athletes of Vietthlon. the measurement tools consisted of questionnaires and in-depth consultations, and the pre- and post-changes were measured and compared based on the results of the winter sports competitions. The results of the study showed that the negative thinking of the athletes was reasonable and positive change. Within a short period of time, confidence and competence in performance were improved, and cognitive anxiety was greatly reduced.

• Korean Security Journal
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• no.22
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• pp.1-14
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• 2010

The purpose of this study was to analyze the difference of body composition, metabolic factor, and blood components according to job forms which are job period and job type and stress level for security guard workers. The conclusion is as follows. 1. There were lower level for the body fat with short term and higher level for the lactate with long term according to the job period. 2. There were lower level for the body fat with the field service and higher level for the lactate and stress with the field service according to the job type. In conclusion, it needs to have a continuous physical activity behavior for the security guard workers to manage for their effective health and to have a rest for the field service workers to decrease their physical and mental stress.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.1884-1888
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• 2008

한국수자원공사는 국내 수자원 관리의 문제점들을 해결하기 위한 기술을 개발하고, 유역 수자원 활용 계획 및 과학적인 다목적댐 운영방안을 마련하기 위하여, 2001년 용담댐 유역을 수자원 시험유역으로 지정하였다. 특히 최근에는 용담호의 유입지천 중 구량천의 상류에 위치한 농업용 저수지인 양악호의 상 하류 지역을 "물수지 시험유역"으로 지정하고, 집중 배치된 다양한 수문관측 장비로부터 신뢰도 높은 자료를 취득하고 있으며, 아울러 농업지역에서의 물수지 분석을 위한 연구를 진행하고 있다. 물수지 시험유역은 향후 공업지역과 주거지역 등 다양한 지역을 대상으로 확대 추진할 계획이며, 종국적으로는 물을 사용하고 있는 형태에 따른 다양한 물수지 특성을 종합하여 다목적 댐의 운영에 필요한 우리나라 고유의 물수지 자료를 구축하고자 한다. 본 논문은 물수지 시험유역 소개, 시험유역에 설치한 수문관측 장비 설명, 저수위 모니터링 결과보고 등의 내용으로 구성되었으며, 구체적으로는 저수지내 수문관측 시설에 대한 정밀측량 실시결과, 저수지의 수위별 내용적 자료, 저수지 근방의 강우자료 및 단기간동안 이루어진 저수지 내에서의 수위 변동 특성을 보여준다.

• Journal of Environmental Health Sciences
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• v.24 no.1
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• pp.24-31
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• 1998

This study was performed to investigate the difference in species of test fish on the determination of short-term bioconcentration factor in zebrafish(Brachydanio rerio), red sword tail(Xiphophorus hellieri) and goldfish(Carassius auratus). Experimental concentrations of carbamates were 0.05 and 0.10 ppm and chlorothalonil were 0.005 and 0.01 ppm for 3 and 5 days, respectively. This paper reports the measured BCF value on pesticides in various species of test fish, under steady state, and examined correlation between the BCF value and depuration rate constant or LC$_{50}$ or lipid content. Carbamates and chlorothalonil concentration in fish extract and BCF of carbamate and chlorothalonil were increased as incresing test concentration. Carbamates concentration in fish extract and BCF of carbamate were decreased as incresing test period, but chlorothalonil concentration in fish extract and BCF of chlorothalonil were increased as prolonging test period. Determined pesticide concentration in fish extract and BCF were highest in red sword tail, and followed by goldfish, and zebrafish. Determined depuration rate constant were highest in zebrafish, and followed by goldfish, and red sword tail. 96hr-LC$_{50}$ were highest in red sword tail, and followed by zebrafish, and goldfish. Lipid compositions were highest in red sword tail, and followed by goldfish, and zebrafish. Therefore, it is suggested that the difference of BCF between each pesticide due to those of lipid composition of fish and deputation rate constant, while LC$_{50}$ have no effect on BCF.