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정관수,황금찬,황인갑 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.1
In this paper the design and fabrication of SAW resonator which could be used as a narrow-band pass filter and its characteristics are studied. The reflector of SAW resonator is designed to be resonated at 69.76㎒ by arraying the 150 metal electrodes of 12.5 ㎛ width which give 99.7% reflection coefficient, and the out put IDT's are designed at 69.7 MHΖto detect the stored energy between refctors. A SAW resonator is fabricated by depositing A1 on the surface of YZ-LiNbO₃which is piezoelectrics using photolithographic method, and it is shown that the resonant frequency of fabricated SAW resonator was obtained at 68.76 MHΖ approximately closed to the theoretical resonant frequency.
액체로켓엔진 연소기의 연소시험을 위한 가압시스템 제어방안
이광진(Kwang-Jin Lee),황창환(Chang-Whan Whang),임지혁(Ji-Hyuk Lim),우성필(Seong-Pil Woo),서대반(Dae-Ban Seo),전준수(Jun-Soo Jeon),유병일(Byung-Il Yu),김성룡(Seung-Ryong Kim),한영민(Young-Min Han),이무근(Mu-Geun Lee),정용갑(Young-Gap 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
액체로켓엔진 연소기의 연소시험을 위한 두가지 가압 방식에 대해 알아 보았다. 하나는 대용량 레귤레이터를 이용한 방법이고, 다른 하나는 멀티 오리피스를 이용한 방식이다. 두가지 방식 모두 반응속도에 따른 압력 섭동의 변화가 나타나는데, 이러한 변화를 보완하기 위해서는 압력 미세 조정을 위한 부가 장치와 제어 알고리즘의 최적화에 대한 연구가 뒷받침되어야 할 것으로 사료된다. This paper describes two ways of pressure-fed system for hot-firing test of a LRE combustion chamber. One is the method of using high capacity regulator, the other is the method of using multi -orifices. Test results show that all of two methods have charateristic pressure oscillations due to reaction rate. To reduce these phenomena, more studies of the additional adjustment apparatus and optimization of control algorithm of pressure-fed system are necessary.
조백기,박종갑,김형옥,김성욱,백승철,김진우,김시용,안규중,전재복,오지원,김낙인,이규석,오칠환,김수남,김상태,손숙자,신용우,김동석,이원우,권경술,서대헌,황규왕,이종석,고재경,강원형,정기양,최응호,김기홍,박석돈,강승주,함정희,명기범,김방순,구상완,김병수,원영호,김한욱,송은섭,정병수,노병인,홍창권,박장규,한지윤,김광중,구대원,김종민,김재홍,유희준,양경미 대한의진균학회 1998 대한의진균학회지 Vol.3 No.2
Background: Onychomycosis, especially toenail onychomycosis has become one of the common fungal infection and has historically been regarded as a cosmetic rather than medical problem by many patients, even by physicians. Recently, however, there are several reports that is a refractory disease which may cause a deleterious effect on patiets quality of life (QOL). Objective: The purpose of this study was to investigate the impact of toenail onychomycosis on QOL in Korea and to assess the chandes of QOL after treatment. Methods: Total 1004 patients with toenail onychomycosis which was confirmed by clinical findings and KOH preparation were were enrolled at 47 dermatologic centers in Korea, and interviewed with standardized QOL questionnaire before and after sytemic antifungal treatment. Responses to the questionnaire were scored by 5-point scale (1∼4) and averaged, and were analyzed for 5 dimensions of emotional impact, social impact, symptorn and functional impact, patients views concerning treatment, and relationship with doctor. Results: 1. Before and after treatment, the most serious impact was emotional dimension showing 1.90 and 1.30 in average score (AS), and social (AS: 1.14 and 0.83) and symptom and functional impact (AS: 1.05 and 0.92) was also affected. 2. In female rather than male, statistically more significant impact on patients QOL was observed in all dimensions. 3. After treatment, 3 of 5 dimensions were improved significantly - emotional dimension (AS : from 1.90 to 1.30), social dimension (AS: from 1.14 to 0.83), patients view concerning treatment (AS: from 1.34 to 1.02). 4. The drgree of patients satisfaction at the therapeutic effect was very high- 62.4% (immediately after treatment) and 65.8% (9 months affer initiation of treatment) of patients answered excellent or good. Conclusion: This study confirms that toenail onychomycosis has significant impact on the overall QOL of patients. Also the effect of antifungal therapy on patients QOL were watisfactory. Therefore, both doctor and patient should pay more attention to the treatment of onychomycosis. [Kor J Med Mycol 3(1): 115∼124]
양재삼,정주영,강정원,황갑수 ( Jae Sam Yang,Ju Young Jeong,Jeong Won Khang,Gap Soo Whang ) 한국물환경학회 1996 한국물환경학회지 Vol.12 No.4
Present status of five heavy metals(Ni, Cu, Cd, Co and Fe) and their geochemical behaviors were investigated with three environmental factors(salinity in seawater, organic contents and silt+clay fractions in sediments) in Ulsan Bay. The concentrations of the studied metals were normalized with those of Fe to compensate the effect of lithogeneous weathering materials. For surface seawater, the normalized Ni, Cu and Co were found to be high in the middle part of the bay and low in both sides of the head and the mouth parts of the bay. Such trend probably is due to the anthropogenic input from the adjacent industrial plants. A highly positive relationship was found between the organic contents and silt+clay fractions in the sediments. Such trends were found between the normalized metal contents and the organic portions in the sediments, and also similar phenomena were detected between the metals and the silt+clay fractions. Whereas Co showed somewhat different pattern of distribution and their possible explanation was intensively discussed.