• Journal of the Institute of Convergence Signal Processing
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• v.8 no.1
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• pp.32-38
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• 2007

In order to establish the environmental condition of sounds in the classroom, we measured the impulse response in cases of using and not-using PA(Public-Address). By calculating the physical index of acoustics, I examined the differences between the two cases. The degree of improvement in listening with the help of PA has also been studied by testing the voice articulation with the use of the measured impulse response. As a result, I found that the clearness is enhanced by increasing the sound pressure level in the case of short reverberation. However, it was not the case when the reverberation time was long.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.19 no.2
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• pp.81-87
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• 2009

Final purpose of this study was designed to develop the quality control(QC) sample for proficiency analytical testing of asbestos. This study consisted of two parts; first, development of manufacturing apparatus and sample preparing procedure for asbestos quality control(QC) sample: second, validation of the QC samples made by our developed method as asbestos proficiency analytical testing sample. The main results of the first part research are as followed We developed the apparatus for manufacturing the asbestos QC sample, consisted of filter hold, filter holder manifolder, vacuum system, and vacuum pump. The most proper filter of making the QC samples was a cellulose ester membrane filter with 25 mm diameter, pore size 0.8 um. And we presented the optimal procedure for preparing the asbestos QC sample by using the developed apparatus. We will verify the manufactured asbestos QC samples by this method, and present the validation results to confirm the reliability as a asbestos QC sample in next paper.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.39 no.3
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• pp.205-210
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• 1994

This experiment was conducted to investigate of soil hardening degree before sowing, furrow depth at sowing and flooding time after sowing at furrowing in flooded rice paddy field that many people have an interest in as direct sowing method most recently. As hardening period was increased, the percentage of seedling stand and seed floating at flooding were increased slightly, while buried depth of stem at maximum tillering stage and cone penetration depth were decreased, respectively. Therefore, optimum degree of soil hardening was about 3 days after draining, at this time, cone penetration degree was about 6~7cm. According to furrow depth was more and more deep, buried depth of stem was increased gradually, but percentage of seedling stand was decreased considerbly. Also, root distribution ratio on surpace horizon and lodging degree were increased gradually according to furrow depth become more and more shallow. As flooding time after sowing was late, percentage of seedling stand and panicle number per $m^2$ were decreased slightly. These results apparently indicated that sowing after 3 days hardening when cone penetration degree was 6~7cm, furrow depth 3~4cm degree and flooding time just after sowing the best method to good establish of seedling stand.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.46 no.3
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• pp.180-183
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• 2001

This study was conducted to find out the effect of ripened grain and rice quality by the breeding of rice dust mite (Steneotarsonemus spinki). Growth temperature of sample (Suwon 441 and Ilpumbyeo) was maintained from 22$^{\circ}C$ (during night) to 26$^{\circ}C$ (during day) in a controlled phytotron. Plant hight and number of panicle could not showed the difference by the discoloration degree of leaf sheath. But number of spikelet was reduced affected by discoloration degree of leaf sheath. Ratio discoloration of grain was increased according to circumstances more discoloration degree of leaf sheath in Suwon 441 then Ilpumbyeo. The perfect rice grain was observed to similar Suwon 441 and Ilpumbyeo in the IV degree of ratio discoloration of grain, but less Suwon 441 than Ilpumbyeo in III and II, in such a case comparison between coloration and discoloration.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.946-948
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• 2002

최근 컴퓨팅 기술의 발전으로 3차원 복합열전달(conjugate heat transfer) 문제를 계산하는 수 치해석 기술이 어느 정도 가능해 졌지만, 실제적인 전력기기 내부의 온도분포를 수치적으로 계산하는 것은 탑재된 구성요소의 다양한 크기와 형상으로 인한 매우 복잡한 경계조건을 수반하고 조밀한 격자를 요구하기 때문에 공학적이지 않다. 이를 위하여 해석적 모델을 수립하여 전력기기 열설계를 위한 수치적 해석에 적용하는 방법이 널리 사용되고 있다. 본 연구에서는 열회로망법(Thermal Network Analysis, TNA)을 이용하여 전력기기 내부의 온도분포를 예측할 수 있는 프로그램을 개발하였다. 전류가 흘러 열이 발생하고 소산되는 주회로 성분들을 각각의 노드로 분할하는 절차를 확립하였고 열접촉저항과 주울열을 적절히 선정함으로써 실제 전류가 흐르는 회로망 내 온도분포를 계산하였다.

• KDI Journal of Economic Policy
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• v.11 no.3
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• pp.61-85
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• 1989

본고(本稿)에서는 최근 달성된 전국민의료보험(全國民醫療保險)(NHI)의 재원조달방식(財源調達方式)을 개관한 다음 소득재분배관점(所得再分配觀點)에서 이론적(理論的), 실증적(實證的) 분석(分析)을 행하고자 한다. 의료보험(醫療保險)은 주로 건강한 사람으로 부터 병든 사람으로 의료(醫療)의 수평적(水平的) 재분배기능(再分配機能)을 행하나 결과적으로 수직적(垂直的) 재분배(再分配)에도 영향을 주게 된다. 형평(衡平)과 관련하여 모든 국민(國民)들에게 필요한 최저수준(最低水準)의 의료이용(醫療利用)을 보장한다든가 의료이용(醫療利用)에 따른 경제적(經濟的) 부담(負擔)을 균등하게 한다든가 하는 제기준(諸基準)의 선택은 결국 우리 사회(社會)가 내려야 할 가치판단(價値判斷)의 문제일 것이나 우리의 여건에 비추어 전자(前者)를 기조(基調)로 하되 후자(後者)를 지향하는 접근방식이 바람직하고 평가된다. 실증분석(實證分析)의 결과는 비록 작은 크기이기는 하나 어느 정도 재분배효과(再分配效果)를 보여주었으나 프로그램간 급여(給與)와 보험료부담(保險料負擔)의 측면에서 격차가 벌어지고 있는 실정이어서 NHI 재정통합(財政統合)이라는 장기목표(長期目標) 아래 소득연계적(所得連繫的)인 보험료부담(保險料負擔) 및 급여체계(給與體系)를 단계적으로 확립해 나가되 우선은 의료보호(醫療保護)부터 이 방안(方案)을 실천에 옮기도록 권고한다.

• 한국생물공학회:학술대회논문집
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• 2000.04a
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• pp.365-369
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• 2000

Methanogenic activity of granular sludge was monitored by specific methanogenic activity (SMA) assay and confocal laser scanning microscopy (CLSM) during start-up of a thermophilic UASB reactor. Autofluorescence by CLSM could visualize the methanogenic bacterial population inside sludge granules and its intensity was proportional to SMA. Considering the complex procedures of SMA measurement, fluorescence quantification by CLSM can be suggested as a routine technique measuring methanogenic activity in UASB granules.

• Journal of the Korean Society for Library and Information Science
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• v.38 no.3
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• pp.159-175
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• 2004

The purposes of this research are to find out why the Korean librarianship has not been fully recognized as a profession and how its recognition can be improved. This research also tries to investigate what the librarians are actually doing at libraries and if their works reflect the criteria of professional works. The research was done through the questionnaires sent to the graduates of the Department of Library Science, Daegu Catholic University working at various types of libraries. Based on the results of the survey, some efforts to improve the professionalism of librarianship are suggested.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.04a
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• pp.183-183
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• 1994

HIV-1 protcase 를 이용한 in vitro assay system을 개발하기 위하여HIV-1 protease유전자를 Ecoli 발현 벡터를 이용하여 발현시켰다. 가능성있는 Protease유전자의 생간 및 분래를 용이하게 하기위하여 maltose binding protein 의 fusion protein을 이용하였으며 protease 의 autoprocessing을 maltose binding protein 의 polyclonal 항체로 확인하였다, 발현된 protease는 일련의 chromatography 방법 (DEAE, SE cellulose, Superose 12, Mono S) 으로 순수하게 분리되었다. 정제된 protease 는 SDS-PAGE분석으로 단일밴드를 보여주었고, 합성된 undecapeptide를 기질로 하였을때 Km 이 9.8$\mu$M 이었다. 효소 assay 를 위해 기질이 protease 에 의해 절단된 생성물을 HPLC를 사용하여 분석하였다. Protease의 억제제 탐색을 위해 유기합성한 몇개의 기질유사체와 HIV-1 증식을 억제하는 것으로 알려진 천연물의 억제정도를 조사하여 보았다. 이들 test 에 사용한 물질들은 높은 농도에서 protease 의 활성을 저해하는 것으로 보아 좋은 억제제는 아닌것으로 시료되나 본 연구를 통하여 확립된 in vitro assay system 은 추후에도 억제제 탐색을 위하여 계속 활용될 수 있을 것이다.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1994.04a
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• pp.328-328
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• 1994

광독성 및 광알러지를 일으키는 제반 약물이나 화학물질의 안정성과생체 이용율을 높이고 현재까지 확실하게 규명되어있지 않은 약물 및 화학물질에의한 광독성 광알러지성의 기전을 이해하고 설명할수있는 학문적 기초를 확립 하고저 phenothiazines 중 몇가지 약물를 택하여 적혈구를 이용한 광용혈 여부와 이에 미치는 ascorbic acid, butyl hydroxy anisole, dibutyl hydroxy toluene의 영향을 조사하였다. 각 약물 농도를 50$\mu\textrm{g}$/m1로 하고 UVA(350nm.2.5 ㎽/cm)조사시간은 30분으로 하여 적혈구의 광용혈현상을 Kahn등의 방법에의해 spectrophotometer로 측정한결과 chlorpromazine, perphenazine, thioridazine매 의한 광용혈정도는 ascorbic acid에의해 유의성 있게 감소되었다. 또한 적혈구를 가하기 전 각 약물을 미리조사시켜 생성된 물질에의한 광용혈현상의 광독성생성물질은 chlor- promazine과 thioridazine에서 보여졌으며, chlorpromazine의 광독성생성물질에 의한 적혈구 용혈현상만 ascorbic acid에의해 감소되었다.