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수리계획기법을 이용한 효율적 물배분 시스템모델 : 서남부지역을 중심으로
한동욱,서종석 전남대학교 농업과학기술연구소 2000 農業科學技術硏究 Vol.35 No.-
In this study, mathematical programming was applied to solve for optimal water allocation in the south-western part of Korea, where water supply and demand are unbalanced. The water allocation system was developed to meet water balance in the region through water transfer between the Keum and the Young-San Rivers. The result of the study shows that water transfer may satisfy various water demands in the region until the year 2011 without building reservoirs.
Capillaria hepatica 感染白鼠에 있어서 蟲卵抗原을 이용한 免疫診斷에 관한 比較硏究
鄭然郁,嚴基善,林漢鍾 고려대학교 의과대학 1985 고려대 의대 잡지 Vol.22 No.3
Comparative studies were performed for Capillaric hepatica antibodies with following immunodiagnostic assays : circumoval precipitation reaction(COP) with lyophilized eggs as antigen, indirect fluorescent antibody test (IFAT) with sectioned egg antigen, enzyme-linked immunosorbent assay(ELISA) with soluble egg antigen and counterimmunoelectrophoresis (CIEP) with soluble egg antigen. In the first part of this study it was found that every type of egg antigens used were effective and showed almost equal sensitivities with proper immunodiagnostic methods. Additionally, antibodies to C. hepatica were detectable only during short period after experimental infection of embryonated eggs. Sera from 40 white rats infected with 2,000 eggs orally were collected randomly between three and nine weeks after infection and the infection with C. hepatica was identified by necropsy. COP, ELISA & CIEP had diagnostic sensitivities of 85.0% and IFAT, 82.5 %. Sera from 5 white rats infected with 2,000 eggs were collected periodically to observe the changing patterns of antibody titers by IFAT and ELISA, which showed that high titers were detected at weeks 3 and 5, then gradually declined through weeks 9 until to negatively converted at weeks 13. The immunodiagnostic method of choice was recommended as ELISA since the antibodies were detectable with lowest protein contents(1.25 ㎍/ml) of antigen and highest dilution of sera (1 : 3,000), even though the equal sensitivity with other methods by different antigen and antibody conditions.
Phenazine 誘導體의 合成과 抗菌作用에 關한 硏究
金鍾大,金浩植,韓盛旭 嶺南大學校附設 基礎科學硏究所 1984 基礎科學硏究 Vol.4 No.-
2-Amino-7-methylphenazine-5, 10-dioxide was synthesized from 4-hydroxyaniline, 6-methybenzofuroxan was previously obtained through various reaction steps starting from 4-aminotoluene. All the intermediates and final product were purified by way of recrystallization, extraction and identified by using IR and NMR spectrophotometer. Antibiotic activity of phenazine dioxide derivative was also determined for some Gram positive and negative bacteria. It was observed that phenazine dioxide derivative strongered antimicrobial activity against both Gram positive and negative microbes than 1-carboxyphenazine which had no alkyl side chain. It was also found that the antimicrobial activity of phenazine dioxide derivative was increased when the nitrogen of the bound to the oxygen and depended on substituted groups.
HFC-134a와 대체냉매 HFC-152a에 CF_3I를 혼합한 자동차냉매 특성
권일욱,박찬수,홍경한,문기선,최운수,서의경,윤갑식,이종인,하옥남 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.1
These days, an attention of environment has been increasing all over the world. to prevent the green house effect and destruction of an ozone layer, an ozone destruction potential(ODP) be zero and a refrigerant for low global warming potential(GWP) is needed. HFC-134a, in which hydrogen is mixed instead of chlorine is a refrigerant used for automobile conditioners and its destruction potential is ecologically zero. However, it is not considered as a perfect substitutive refrigerant as its GWP is high. It is studied refrigerant mixtures in which HFC-134a, HFC-152a and CF_3I with low GWP and zero ODP are mixed by experimentally and concluded as follows; 1. with the variation of speed of compressor outside temperature and flow rate, the heat of evaporator and compressor and coefficient of performance was varied, and influenced the air conditioner. 2. The pressure of evaporator was decreased with increasing the speed of compressor and that of the refrigerant HFC-134a was higher 21% than that of azotrope refrigerant mixed with CF_3I. The overall capacity of condensor and evaporator was increased and HGC-134a was higher than azotrope refrigerant mixed with CF_3I 3. The capacity of evaporator with the refrigerant HFC-134a was higher 6% than azotrope refrigerant mixed with CF31 and the required power with zaotrope refrigerant mixed with CF_3I was higher 11% than that of HFC-134a. 4. The COP of the refrigerant FHC-134a was higher 31% in 1000RPM. when outside temperature was increased, COP was decreased. 5. Performance of HFC-134a is better than azotrope refrigerant mixed with CF_3I but prefered zaotrope refrigerant mixed with CF_3I considering the environment.
김종수,성낙규,이승환,강승욱,한경희 명지대학교 대학원 1997 대학원논문집 Vol.1 No.-
The solar cells should be operated at the maximum power point because its output characteristics are greatly fluctuate on the variations of insolation, temperature and loads. To obtain maximum power from solar cell, photovoltaic system cell power system usually requires maximum power point tracking controller. This paper propose Maximum power point tracking method by power compare and fuzzy control. The power compare method have got fault that is oscillation and speed of trace at maximum power point. To solve two problem of the power compare method, designed fuzzy controller logic traces maximum power point without variations of insolation, temperature and loads.
임종한,장성실,김성아,문재동,채창호,홍윤철,김수영,김진석,김영욱,한상환,이혜숙,원종욱,송동빈,하은희,강성규 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.2
기존의 특수건강진단과 작업환경측정을 통한 직업병 관리가 진폐증, 소음성난청 등의 소수 특정질환에 국한되고 실제 직업병 발생 규모 파악이나 신종 직업병의 발견에 한계를 보인다는 사실은 산업의학전문가들 사이에서도 공감을 이루고 있다. 미국과 영국 등에서의 직업성질환 감시체계에 대한 경험은 우리 나라의 직업성질환 감시체계 구축에도 새로운 자극제가 되면서, 1998년이후 인천, 대전, 여천, 구미, 부울경 지역에서 지역 직업성질환감시체계를 산업보건관리의 중요한 시스템으로 구축하려는 노력이 확산되고 있다. 새로이 구축되어지는 이들 지역 직업성질환 감시체계는 감시하고자 하는 대상질환, 활용 가능한 인적자원 및 자료원, 지역 의료체계의 특수성 등에 따라서 목적과 방법을 달리하면서 독특한 형태로 발전을 하고 있다. 각 지역단위 감시체계들이 그 상황에 맞게 독특한 목적과 전략들을 발전 시키면서도, 향후 발전할 국가적인 차원의 직업성질환 감시체계 구축을 위하여 직업성질환 감시의 기본 전략 등을 공유하는 등의 노력이 필요하다. 환례 정의 및 기본적인 등록 서식의 공유, 직업성질환 감시 자료원의 발굴, 공동의 정보 네트워크 및 직업성질환 감시 데이터베이스 구축 등 직업성질환 감시활동을 지원하기 위한 여러 기초 인프라 구축에 힘을 모아야 할 것이다. 우리 나라에서 직업성질환 감시체계를 성공적으로 구축하기 위해서는 수집된 자료의 질 관리를 위한 직업성질환 감시의 원칙 제정과 감시 전략의 공유 등이 필요하며, 전국적인 직업성질환 감시체계의 하부구조라고 할 수 있는 지역감시체계의 기초 토대 마련과 강화작업이 절실하게 필요하다.