• Proceedings of the Korean Society of Life Science Conference
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• 2000.09a
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• pp.50-51
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• 2000

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1780-1781
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• 2011

There have been numerous studies on application of robots to in-pipe inspection system. In this thesis, a mobile robot that can move through elbows and vertical pipes having diameter 100mm is developed. Defect detection technology for locating wall-thinnings, corrosions and foreign materials is developed for high temperature and pressure pipings in thermal power plants, utilizing laser sensors installed on the robot. Actual defect detection performance is evaluated with application of the developed robot system to a mock-up pipings.

• Journal of Environmental Science International
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• v.4 no.2
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• pp.105-116
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• 1995

Identified 7 species of the genus Prorocentrum which have been obtained from the southern coast area for 4 years from 1990 to 1994 can be summarized as followed. P.balticum is rare species, causing a red tide, and P.dentatum, P.micans, P.minimum, P.triestinum are cosmopolitan species often causing a red tide in the study area. P.gracile and P.lima are very rarely showed up, the former is recorded at first in domestic and later is benthic attached species which has diarrheic shellfish poison.

• 한국전기화학회:학술대회논문집
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• 2000.12a
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• pp.51-62
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• 2000

Large plastic Li-ion (PLI) cells (25 to 28-Ah) were fabricated for an EV application. The 28-Ah cells showed high specific energy (160 Wh/kg), high specific power (526 W/g), excellent round-trip energy efficiency $(92\%)$, and low self-discharge rate ($6\%$ in 30 days). A 25-Ah cell of an earlier design showed good cycle life of up to 750 cycles at $100\%$ DOD to $80\%$ of its initial capacity, while cycle life test of a 28-Ah cell of a later design is in progress. Preliminary safety tests were also carried out using 6-Ah cells of a similar electrode design giving very encouraging results for development of a safe hish-energy density PLI battery for EV application.

• Korean Journal of Materials Research
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• v.1 no.3
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• pp.168-174
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• 1991

Ti-silicide was deposited by sputtering the composite target($TiSi_{2.6}$) on single-Si wafers and oxide on them. The heat treatment temperatures by rapid thermal annealing(RTA) have been varied in the range of $600-850^{\circ}C$ for 20seconds. It was not until RTA temperature was $800^{\circ}C$ that a stable $TiSi_2$ was formed, and the value of resistivity of that phase was $27~29{\mu}{\Omega}-cm$, which seems a little higher than that formed by the reactive method. The result of x-ray diffraction peals showed that till $750^{\circ}C$, C49 $TiSi_2$ phase was dominant, but at $800^{\circ}C$, at last, the phase was transformed into a stable C54 $TiSi_2$ phase. And, the result of x-ray photoeletron spectroscopy(XPS) measurements showed that the composition ratio of Ti and Si was 2 1 in the case of specimens treated at $800^{\circ}C$, The surface roughness of $TiSi_2$, which was condidered a weak point, was improved to a superior value of $17{\pm}1nm$, therefore increasing the possibility of applying $TiSi_2$ to semiconductor devices.

• The Journal of the Korean dental association
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• v.38 no.9 s.376
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• pp.850-855
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• 2000

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.366-366
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• 2011

냉중성자원은 하나로 반사체탱크에 위치한 수직공에 설치되어 노심에서 발생하는 열중성자를 감속재인 액체수소층을 통과시켜 냉중성자를 생산하는 설비로 수소가를 충전하고 있는 수소계통이 있으며, 21K의 극저온 액체수소/기체수소 2상(ttwo-phase)을 유지하기 위해 외부에서 유입되는 열침입을 최소화하기 위해 진공계통이 설치되어 있다. 진공계통은 수조내기기 집합체(In-Pool Assembly : IPA)의 액체수소 열사이펀, 감속재 용기 등의 냉중성자원 극저온 부풀들의 단열을 위하여 진공용기 내부진공도를 공정진공도 이하로 유지하기 위한 계통으로 고진공펌프, 진공배기탱크 및 저진공펌프의 조합으로 두 개의 진공펌프시스템과 진공박스, 배기수집탱크 및 밸브박스를 포함한 연결배관으로 설계되었다. 저진공펌프를 이용하여 대기압에서 고진공펌프 작동압력까지 도달한 후 고진공펌프를 가동하여 공정진공도 이하의 진공도를 확보하고, 고진공펌프로부터 배기되는 배출가스는 고진공펌프 후단에 설치된 진공배기탱크에 포집되며, 필요 시 저진공펌프레 의하여 배기수집탱크로 배출된다. 진공펌프시스템은 진공용기 내부의 압력이 공정진동고 이하로 유지되도록 연속적으로 가동되어 진공단열이 가능하다. 본 논문은 감속재인 수소를 액화상태로 유지하며, 공정진공도 이하로 충분히 유지되어 운전되는 진공계통의 특성을 원자로 운전 주기별로 소개하고자 한다.

• Proceedings of the Korean Vacuum Society Conference
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• 2011.02a
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• pp.361-361
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• 2011

하나로 냉중성자원(CNS: Cold Neutron Source)은 원자로 수조내 반사체 탱크에 위치한 수직 조사공에 설치되어 하나로 노심에서 발생하는 열중성자를 감속재인 액체 수소층을 통과시켜 냉중성자를 생산한다. 생성된 냉중성자는 유도관을 통하여 냉중성자 산란장치에 공급되어 이용 연구에 활용된다. 감속재로 사용되는 수소는 헬륨냉동계통의 운전에 따라 수소가 수조내기기 집합체(IPA: In Pool Assembly) 내로 이동되어 액화되어지므로, 극저온의 헬륨가스의 흐름이 중요하다. 헬륨냉동기에 의해 만들어진 극저온인 헬륨은 IPA 내의 수소와 열교환을 하기 위해서 배관을 통해 이동되며, 열손실없이 전달하기 위하여 헬륨 배관은 진공층이 형성된 이중배관으로 설계되어 있다. 헬륨 이중배관은 공급 및 회수 배관으로 구성되어 있으며, 헬륨 배관의 외관에 진공층을 20개의 구간으로 나누어 제작 및 설치되었으며, 각각의 진공도를 유지하고 있다. 이 논문에서는 하나로 냉중성자원 헬륨 이중배관의 특성과 헬륨냉동계통의 운전 및 정지시 온도 변화에 따른 이중배관 진공도의 변화를 분석하였다.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.45 no.12
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• pp.139-145
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• 2008

In this paper, a microstrip surface wave antenna(SWA) with a frequency selective surface structure(FSS) is designed and measured. A microstrip SWA has many advantages such as low profile, low weight, easy fabrication, and compatibility with monolithic microwave integrated circuits(MMIC). In addition, it has demonstrated monopole like beam patterns. The microstrip SWA consists of two parts : a center-fed modified microstrip patch to excite surface wave, and a periodic patches to support the propagation of the surface waves. To obtain wide bandwidth, the ring type parasitic element is inserted and the circular patch is selected for the unit element in FSS structure. Experimental results show that the microstrip SWA has monopole like beam patterns at 5.9GHz. Impedance bandwidth and gain is 12% and 5.6dBi.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.50 no.3
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• pp.301-309
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• 2014

This study was carried out to compare the regional fishing gears and catches of the gape net with wings used in Jeonnam, Korea. The total length of the gear used in Yeosu, Wando and Jindo was 107.0m, 64.0m, 52.8m, and the size of codend was 4.3mm. 7.8mm. 9.8mm, respectively. The total number of bycatch species from anchovy (Engraulis japonicus) catches in Yeosu, Wando, and Jindo during the survey period were 21, 13, and 13 species. A total of individuals of anchovy accounted for over 90% out of total catches in all survey areas. The proportion of anchovy individuals was constantly high up to October in Yeosu, but it showed a sharp reduction to 18% in October in Wando with the increase of the individuals of Kammal thryssa (Thryssa kammalensis) and Big eyed herring (Sardinella zunasi). In Jindo, individuals of anchovy occupied over 99.8% out of total catches up to August. Since August, the number of individuals of Big eyed herring (Sardinella zunasi), Kammal thryssa (Thryssa kammalensis), and Slimy (Leiognathus nuchalis) has increased while the number of anchovy individuals were decreased.