• 한국수산과학회지
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• 제42권1호
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• pp.20-25
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• 2009

Thirty-eight Vibrio spp. were isolated from the sea waters harvested from the 22 stations located on the west coast of the Korean peninsula in September 2006. The isolates consisted of V. parahaemolyticus (n=21), V. alginolyticus (n= 16) and V. cholerae non-01 (n=1), among which 35 isolates displayed resistance against two of the tested antibiotics. Among the 38 isolates, 18 isolates exhibited multi-drug resistance against more than four 4 antibiotics. In particular, minimum inhibitory concentration $(MIC)_{50}$ and $MIC_{90}$ of ampicillin-resistant isolates were as high as $2,048{\mu}g{\cdot}mL^{-1}$ and $4,096{\mu}g{\cdot}mL^{-1}$ respectively. $\beta$-lactamase production was examined to analyze the ampicillin-resistance. Some Vibrio spp. isolates produced $\beta$-lactamase, however antibiotics resistance pattern and $\beta$-lactamase production were not clearly related to each other. A genetic relationship between resistance and gene expression was confirmed in the ampicillin-resistant isolates.

• 디지털산업정보학회논문지
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• 제5권3호
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• pp.29-37
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• 2009

It is as result that study to apply mini magnet nerve curer in peripheral nervous system disease treatment. Simulator and embodied action power and Control Unit in cylinder form of magnet roof object firstly. Yielded service area about special quality of probe of loop object cylinder style and treatment area dimension and distance of treatment pulse secondly. Embody pulse forming course energy value by Probe's form by third, could embody treatment pulse by disease. Specially, through a special quality experiment, saved Damping pulse form and treatment digital forming etc. variously. Lately, embodied this to aid a little in disease treatment that follow that there is no invasion that there is no stimulation by medicine development. Neuralgia, muscular disease and Altzheimer, with stroke etc. is becoming the matter of concern and interest which disease of adult etc. it is same is important. And the melancholia in compliance with the modern direction of a ceremony which is complicated and garrulous, trillion it will cry and symptoms, it is a tendency where the emotional obstacle etc. nervous psychiatric disorder patient is increasing at class speed. But currently the applicator it will be able to treat like this disease almost it is a condition which is wholly lacking. Consequently like this disease it used magnetic stimulation and it diagnosed and the equipment it will be able to treat plan and it embodied.

• 한국통신학회논문지
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• 제27권5C호
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• pp.435-444
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• 2002

본 논문에서는, 세션별 결정적 지연품질의 보장이 주어짐과 동시에, 세션간 서비스품질의 안정성이 지원되는 패킷 스케쥴링 알고리즘인 "클래스별 서비스 차등제공" (CSL: Class level Service Lagging) 알고리즘[6]에 대하여, 시뮬레이션을 통한 기능 검증과, 실질적 구현에 관련된 이슈를 분석하였다. 서비스품질의 안정성 면에서 CSL알고리즘과 EDD(Earliest Due Date) 방식과의 차별성을 확인하였다. 구현의 복잡성에 대한 검토에서, CSL알고리즘은 sorting을 제외하고는, 0(1)의 복잡성을 갖도록 구현될 수 있음을 보였다. 공평큐잉의 기본 골격이 유지됨으로써, 다양한 형태의 공평큐잉 구현에 쉽게 적용될 수 있는 점은 CSL알고리즘이 갖는 주요 특징이다. TCP/IP 네트워크에서와 같이, 사용자의 의지에 의존하는 TCP 혼잡제어의 환경에서, 세션간 서비스품질의 안정성 보장은 필수적이며, 이러한 측면에서 CSL알고리즘이 갖는 적합성을 확인하였다.합성을 확인하였다.

• 대한전자공학회논문지TC
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• 제38권11호
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• pp.1-8
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• 2001

본 논문에서 제안한 적응적 엄격 패킷 폐기 메커니즘은 사이클 사이의 트래픽 변화를 예측하여 혼잡제어를 위한 패킷 폐기를 적응적으로 처리할 수 있다. 따라서 제안된 메커니즘은 RIO 메커니즘의 단순 폐기율적용에 대한 단점을 보완하고, 동적 엄격 패킷 폐기 메커니즘(DSPD)의 예측 가능한 대역폭의 낭비를 최소화하였다. 시뮬레이션을 수행하여 망 트래픽의 상태에 따라 동적으로 변하는 전송가능 폐기순위에 따른 처리율과 패킷 폐기율을 RIO, DSPD 메커니즘과 비교 분석하였다. 시뮬레이션을 분석한 결과 제안된 메커니즘은 트래픽의 양에 상관없이 각 AF 클래스의 폐기순위를 엄격하게 적용하고 폐기순위에 따른 패킷 전송 능력을 RIO, DSPD에 비하여 개선하였음을 증명하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권12호
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• pp.5191-5211
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• 2016

It is essential to satisfy class-specific QoS constraints to provide broadband services for new generation networks. The present study proposes a QoS-driven multicast scheme for wireless networks in which the transmission rate and end-to-end delay are assumed to be bounded during a multiple multicast session. A distributed algorithm was used to identify a cost-efficient sub-graph between the source and destination which can satisfy QoS constraints of a multicast session. The model was then modified as to be applied for wireless networks in which satisfying interference constraints is the main challenge. A discrete power control scheme was also applied for the QoS-aware multicast model to accommodate the effect of transmission power level based on link capacity requirements. We also proposed random power allocation (RPA) and gradient power allocation (GPA) algorithms to efficient resource distribution each of which has different time complexity and optimality levels. Experimental results confirm that the proposed power allocation techniques decrease the number of unavailable links between intermediate nodes in the sub-graph and considerably increase the chance of finding an optimal solution.

• 한국유체기계학회 논문집
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• 제15권4호
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• pp.50-54
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• 2012

Wind-power generation, which is recently drawing attention as one of renewable energies across the world, has been developed mainly by Europe. As the demand for the wind-power generation rose and the amount of wind-power generation increased, the studies on megawatt-class wind-power system have been active, and the use of composite with such properties as less weight, more strength, anti-corrosion and environment-friendliness has required gradually. In other word, wind turbine tower will be required to be lighter, more reliable and more consistent. Therefore it is necessary to lose weight of the wind turbine tower. This points squarely toward hybrid/composite tower production growing. It is important to note however that hybrid/composite tower production as it is today is flawed and that there are ways to improve greatly on the performance of these towers in manufacturing process and in their in-service performance. Through this, we have some detail on the current process and its advantage of cost and weight of towers.

• 보건행정학회지
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• 제27권2호
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• pp.177-185
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• 2017

Background: The mental problems of the elderly are at issue as a serious social phenomenon. The purpose of this study is to identify risk factors affecting the mood disorders of the elderly. Methods: The subjects were 1,779,236 aged ${\geq}65$ and participated in health screening. Dependent variable was mood disorders. Independent variables were consisted of community level (regional deprivation index and healthcare resources) and individual level (sex, age, insurance type, disability, smoking, alcohol, physical activity, body mass index, and healthcare utilization). Multilevel logistic regression was performed. Results: At the individual level, women, employed insured, severely disabled people, heavy alcohol drinkers, high-intensity physical activity, body mass index, and patients who had chronic disease and severe disease were significantly associated with mood disorders. As the age has increased, it has let increase of mood disorders. At the community level, as the regional deprivation index has increased by 1, mood disorders has been increased by 1.005 times. The intra-class coefficient was 7.04%. Conclusion: We found individual and community level factors are associated with mood disorders. Systematic approach is essential to reduce mood disorders.

• 한국도서관정보학회지
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• 제38권1호
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• pp.397-421
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• 2007

사서교사는 수업을 담당하는 교사로서 뿐만 아니라 학교도서관의 정보관리자로서 학생, 교사 및 직원에게 안전한 서비스를 제공하기 위하여 저작권법에 관한 지식을 두루 갖추어야 한다. 사서교사들이 저작권 지식을 갖추도록 하기 위해서는 사서교사들이 저작권에 대하여 어느 정도의 인식을 가지고 있는가에 대한 실증연구가 필요하다. 이에 본 연구는 2006년 사서교사 1급 자격연수 과정에 참여한 사서교사들을 대상으로 저작권에 대한 인식도를 측정하였다. 본 설문분석 결과에 기초해서, 학교도서관 사서교사의 저작권 인식을 제고시키기 위한 개선방안을 구체적으로 제시하였다.

• 한국산학기술학회논문지
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• 제11권2호
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• pp.525-531
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• 2010

본 논문에서는 교육현장에서 간편하게 활용할 수 있는 SMS를 이용한 모바일 퀴즈 시스템을 개발하였다. 본 시스템은 즉각적으로 학생들에게는 퀴즈 결과에 대한 SMS 개별통보를, 교수자에게는 성적 통계를 제공한다. 실제 대학교육 현장에서의 시험운용을 통해, 본 시스템이, 학생들에게는 강의에 대한 흥미를 유발하고 몰입도를 높이며 교수자에게는 강의 수준을 즉각적으로 적절히 조절할 수 있는 교육 수단을 제공하여, 효과적인 교육도구로 활용될 수 있을 것으로 기대된다.

• 전기전자학회논문지
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• 제4권2호
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• pp.241-248
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• 2000

채널간의 상호 변조에 의한 왜곡성분이 주로 전력 증폭기의 비선형성에 의해 발생하는 CDMA 시스템에서는 선형 전력 증폭기를 필요로 하게 된다. 본 논문에서는 평형 MESFET 전치 왜곡 선형화기가 추가된 새로운 형태의 선형화 방법을 제안하였다. 제안된 선형화기는 한국 PCS주파수 대역에서 30dBm A급 전력 증폭기에 연결하여 시뮬레이션하였으며 실험 결과를 통하여 1dB 압축점은 2dBm, 상호변조왜곡은 12.5dBc정도 개선됨을 보였다.