• Journal of Oral Medicine and Pain
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• v.19 no.2
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• pp.99-110
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• 1994

저자는 저작 수준의 등척성 수축시 하악 폐구근에서의 근전도 스펙트럼의 특성을 규명하기 위하여, 정상 성인 25명을 대상으로 최대수의적 수축의 40% 수준으로 근활성을 2분간 유지하게 하고, 이때 전측두근과 교근에서 얻어진 근전기 신호를 컴퓨터를 이용한 근전도 시스템을 이용하여 분석한 결과 다음과 같은 결론을 얻었다. 1. 저작 수준의 등척성 수축 지속시 시작과 마지막 구간 모두에서 전측두근과 교근의 평균중간주파수와 중간주파수 기울기는 성별 및 연령의 영향을 받지 않았다. 2. 저작 수준의 등척성 수축 지속시 시작과 마지막 구간 모두에서 전측두근과 교근의 평균중간주파수와 중간주파수 기울기는 좌우사이에 통계적으로 유의한 차이가 없었다. 3. 저작 수준의 등척성 수축 지속시 전측두근과 교근의 마지막 구간 평균중간주파수는 시작 구간 평균 중간주파수보다 통계학적으로 유의하게 낮았다.(전측두근 : p<0.01, 교근 : p<0.01). 4. 전측두근과 교근에서 저작 수준의 등척성 수축이 지속됨에 따라 시작 구간과 마지막 구간 모두에서 power spectrum은 저주파 영역으로 이동하였으나, 중간주파수 기울기는 시작 구간과 마지막 구간 사이에 통계적으로 유의한 차이가 없었다.

• The Transactions of the Korean Institute of Power Electronics
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• v.18 no.1
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• pp.37-44
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• 2013

In this paper, the characteristics of portable fuel cell system are introduced and the dynamic response of output voltage of fuel cell stack with internal humidifier is analyzed. When the output of the fuel cell (FC) stack is short-circuited for humidification, the output voltage of the FC stack rapidly drops. In order to maintain the load voltage in the required range, dynamic compensation methods are proposed: 1) installing a capacitor behind the output of the FC stack; 2) utilizing the bi-directional converter. Especially, bi-directional converter is used when short of the FC output is detected or predicted by algorithm using data which is measured during previous three cycles. These methods are simulated by PSIM 9.0, then experimental results from the fuel cell system prototype verify the validity of the proposed methods.

• Journal of the Korean Institute of Intelligent Systems
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• v.21 no.4
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• pp.423-429
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• 2011

This paper deals with the observer-based decentralized fuzzy controller design for nonlinear interconnected system for PEMFC. The nonlinear interconnected system is represented by a Takagi-Sugeno (T-S) fuzzy model. Based on T-S fuzzy interconnected system, the fuzzy observer and the decentralized fuzzy controller are designed. The stability condition of the closed-loop system with the proposed controller is represented to the linear matrix inequality (LMI) form, and the observer and control gain s are obtained by LMI. An example is given to show the verification discussed throughout the paper.

• Journal of Advanced Marine Engineering and Technology
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• v.33 no.6
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• pp.822-826
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• 2009

In case of engine room of ship, it uses type 2 ventilation system which supplies outside air forcibly by engine room ventilation fan, and naturally discharges air to outlet through low-pressed casing. The advantage of type 2 ventilation is that it makes inside with bi-pressure status to discharge contaminated materials to outside naturally. However, there is a phenomenon that pressure is greatly different between outside and inside due to huge amount of air supply by engine room ventilation fan. Therefore, we went aboard a container vessel which is on test run to analyze differential pressure with micronanometer by engine load and by combustion air supply method of engine. As a result, as engine load decreases (50, 75, 100%), the differential pressure between outside and inside tends to increase by 35% average, and the difference of pressure was 6.5 times maximum by combustion air supply method of engine.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2002.10a
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• pp.119-123
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• 2002

Liquefied Natural Gas(LNG) continues to attract modern gas industries as well as domestic markets as their main energy source in the recent years. This is mainly because LNG is inherently cleaner and more energy efficiency than other fuels. Offshore LNG production plant is of interest to many oil producing companies all over the world. This article discuss about the production process encountered while developing such a production facility. Typical offshore oil and gas processing required for oil stabilization and other optional units that can be added to the facilities. The production process can broadly be divided into five major units namely, (i) Oil Stabilization unit, (ii) Gas Treatment unit, (iii) Methane Recovery unit, (iv) Distillation unit and (v) LNG Liquefaction unit. The process simulation was carried out for each unit with a given wellhead composition. The topside facilities of offshore LNG production plant will be very similar to the process adopted in offshore processing platform along with the typical onshore LNG production plant. However, the process design problems associated with FPSO motion to be taken care of while developing floating LNG production plant.

• Journal of the Korean Institute of Intelligent Systems
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• v.18 no.3
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• pp.335-340
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• 2008

In this paper, a decentralized fuzzy output feedback controller for nonlinear interconnected systems with time delay is proposed. The nonlinear interconnected system is represented to fuzzy system using Takagi-Sugeno (T-S) fuzzy model. The decentralized output feedback controller is designed(or stability of subsystems of the fuzzy interconnected system. The stable condition of the closed-loop subsystem is represented to the linear matrix inequality (LMI) form and control gain is obtained by LMI. An example is given to show the verification discussed throughout the paper.

• Journal of the Korean Institute of Intelligent Systems
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• v.27 no.1
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• pp.15-21
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• 2017

In this paper, the decentralized fuzzy observer design technique is presented for discrete-time nonlinear interconnected systems, which are assumed to be with unknown interconnections. To design the decentralized fuzzy observer, the design problem is considered and the performance function is defined to solve the design problem. Based on the performance function, the sufficient condition is derived for the observer design, and its condition is formulated into linear matrix inequalities. Finally, by the simulation result, the validity of the proposed observer design technique is shown.

• Animal Systematics, Evolution and Diversity
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• no.nspc5
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• pp.61-70
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• 2005

A new marine interstitial nematode species belonging to the subgenus Quadricoma of order Desmoscolecida is described from Jindo Island, South Korea. The new species, Tricoma (Quadricoma) jindoensis sp. nov., is most allied with T. (Q.) crassicomoides Timm, 1970 in sharing the similar cephalic setae, broadly truncated border of head, lip region including 6 labial papillae, and slender and long spicule among the seven congeners with 44 quadricomoid rings. However, T. (Q.) jindoensis differs from it by the globular protuberance on the penultimate ring, 7 tail rings, and 9 pairs of subdorsal setae in male. This is the first record of Quadricoma nematodes from East Asia.

• Archives of Hand and Microsurgery
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• v.23 no.4
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• pp.267-270
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• 2018

Recurrent motor branch entrapment syndrome is a compressive mononeuropathy of recurrent motor branch of median nerve. It is a rare condition as a cause of thenar muscle wasting and may have different pathogenesis. If such an anatomical variation is the cause, there is a possibility that thenar muscle atrophy remains if only the transcarpal ligament release is performed. We report a 25-year-old male patient with carpal tunnel syndrome with thenar muscle wasting 1 month ago.

• Journal of Practical Agriculture & Fisheries Research
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• v.3 no.1
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• pp.79-84
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• 2001

The experiment were carried out to establish the optimal condition of bulblet size, low temperature treatment and time of incubation in acclimatization on stem emergence of Lilium oriental hybrids. The large size bulblet was better than middle and small size bulblets in percentage of stem emergence and weight of bulblets. The highest percentage of stem emergence was 95% in large size bulblet 'Acapulco' but small size bulblet of 'Casablanca' was no stem emergence. Low temperature treatment(5℃)for breaking dormancy was needed at least more than 9weeks. Weight of bulblets and percentage of stem emergence was not good in 5℃ treatment for 6 weeks. The best stem emergence showed 5 month growing in vitro and the weigh test bulblets during acclimatization of bulblet