회분증유공정에 있어서 Holdup Ratio 의 효과에 관한 연구 : 회분증유에 관한 연구(2) The Studies on the Fractional Batch Distillation ( 2 )

김우식,정운수,조창래 한국화학공학회 1973 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.11 No.5

本硏究는 第2報로써 非定常狀態下에서의 回分蒸留工程의 있어서 Holdup ratio의 효과를 규명하려 한 것이다. 操作時間의 따른 Still pot內의 濃度變化를 蒸留速度로 定義하여 다음과 같은 理論式을 誘導했다. (수식) 試料는 Benzene-Carbontetrachloride와 Methanol-Ethanol 等의 二成分系를 使用했으며 實驗値와 比較검토 結果 上記 理論式과 잘 一致했다. 한편, Reflux ratio가 낮을 때는 Holdup ratio가 증가할수록 분리효과는 증가하였고, Reflux ratio가 높을 경우는 Holdup ratio가 증가할수록 분리효과는 감소했다. 따라서 다른 모든 變數를 일정하게 유지시켰을 때 Holdup ratio의 분리효과는 Reflux ratio의 의존함을 알았다. 또 Holdup ratio의 분리효과가 뚜렷이 나타나지 않았을 때의 Reflux ratio를 Critical Reflux ratio라 하였으며 本 硏究에서 Benzene-Carbontetrachloride의 Critical Reflux ratio는 9였고 Methanol-Ethanol系에서는 2였다. This study is concerned with the separation of binary mixtures in the fractional batch distillation under various conditions of Holdup to charge ratio at constant reflux ratio. The rate of separation is defined as the rate of change in the still composition with respect to the operating time elapsed. Under proper assumption a theoretical equation relating the still composition with the operating time was derived as; (수식) The equation was compared with experimental results obtained with two binary mixtures, i.e., Benzene-CTC(carbontetrachloride) and Methanol-Ethanol, in a Oldershaw-type batch distillation apparatus. Consequently the equation was found to be substantially agreed with the experimental results, especially for the Methanol-Ethanol system. For the benzene-CTC system the equation tended to agree with experimental results. Meanwhile, holdup ratio was found experimently to have two counteracting effects on the separation of binary mixtures. Namely, in a series of experimental works, as the reflux ratio was increased above the critical reflux ratio the effect of increased holdup ratio become increasingly unfavorable to sharpness of separation. At reflux ratio below the critical reflux ratio the effect of increasing holdup ratio was favorable. For the Benzene-CTC system (30 plates) the critical reflux ratio was 9, at the Methanol-Ethanol system was 2.

Solvent Effects in Radical Copolymerization of N - Vinylurea and Vinyl Acetate

김우식,권오량,이학기 한국고분자학회 1979 폴리머 Vol.3 No.6

Determination of Poly ( vinyl alcohol ) Branching with Gel - Permeation Chromatography

김우식,이학기 한국고분자학회 1977 폴리머 Vol.1 No.3

조직에서 신뢰(trust)와 불신(distrust)을 보는 두 관점

김우식 청주대학교사회과학연구소 2016 한국사회과학연구 Vol.37 No.2

신뢰와 불신의 관계를 보는 관점에는 두 가지가 있다. 하나는 많은 연구자들이 신뢰와 불신은 단일 차원적이고 상호배타적으로 연속선상의 한 쪽 끝으로 반대되는 개념으로 규정한다. 그러나 어떤 학자들은 이에 동의하지 않는다. 그들은 신뢰와 불신을 분리되는 개념이며, 각각의 선행요인과 결과를 가지고 있는 독립적인 개념으로 본다. 그러나 이들은 서로 연결된 개념이라고 한다. 그렇기 때문에 상호공존의 이중 감정을 가지고 공존할 수 있는 개념으로 본다. 이 논문은 이들 두 관점을 소개하면서, 불신 개념의 기능성을 다시 한번 생각해 보는 공간을 갖는 것이다. 이어서 Saunders 등이 이들 두 관점의 실제를 연구한 논문을 첨가 하여 비교의 의미를 높였다. There are two contradictory perspectives on trust and distrust relationship. Most researchers conceptualize trust and distrust as unidimensional and antithetical at mutually exclusive ends of a single continuous construct. Others disagree. They conceptualize trust and distrust as separate, independent constructs with their own antecedents and consequences, but are nevertheless linked, and can therefore co-exist with ambivalence in the same relationship. My job in this essay is to introduce two perspectives on trust and distrust relationships, and to highlight the functionality of distrust. And Saunders et al.’ research findings are added. Their research has investigated realities of two perspectives.

폴리비닐알코올의 branch 정량

김우식 한국고분자학회 1978 폴리머 Vol.2 No.3

말씀과 신학 : 말씀의 샘 ; 담대한 자만이 살아 남는다 -신명기 31:6

김우식 기독교대한성결교회 활천사 2003 활천 Vol.597 No.-

노인의 생활체육 참여에 따른 생활만족도에 관한 연구 청주시 지방자치단체 시설 중심으로

김우식 충북연구원 2012 지역정책연구 Vol.23 No.2

The purpose of this study is to establish the effects of senior citizens’ participation in sports for all on their life satisfaction. This study targeted 234 senior citizens out of 250 senior citizens above 65 who participated in sport for all program at 3 local government facilities in Cheondju, excluding 16 senior citizens. The findings are as follows. First, with respect to the effect on life satisfaction in accordance with demographic variables, in gender, the effect on female appeared high in comparison satisfaction, self-satisfaction and achievement satisfaction; with respect to the effect on life satisfaction in accordance with whether or not both husband and wife are alive, comparative satisfaction, self-satisfaction and achievement satisfaction were high when both husband and wife were alive; with respect to the self-satisfaction in accordance with education level, those with education above college graduation was high; with respect to the expectation satisfaction, those without educational background was high; with respect to comparison satisfaction in accordance with income level, those with the income above 2mil Korean won was higher than those with the income below 500K Korean won; with respect to the comparative satisfaction in accordance with heath, very healthy was higher than moderate; and as a result of self-satisfaction and very healthy, there was no significant difference between groups in remembrance satisfaction. Second, private sports was higher than group sports in accordance the type of sports. Third, with respect to the effect on life satisfaction in accordance with the degree of the participation in sports for all, 6 months to 1 year was higher than less than 3 months in self-satisfaction in the duration of participation; with respect to comparison satisfaction in accordance with the frequence of participation, more than 7 times per week was high; more than 7 times per week was high in achievement satisfaction; with respect to comparison satisfaction depending on the strength of participation, there was no significant difference between groups, yet 1-2 hours was higher than less than 30 minutes. -

Model Driven Architecture 기술 소개

김우식,권오천,신규상,Kim, W.S.,Kwon, O.C.,Shin, K.S. 한국전자통신연구원 2002 전자통신동향분석 Vol.17 No.6

2001년 9월 OMG는 시스템을 명세하고 구축하기 위한 새로운 방안으로 MDA(Model Driven Architecture)를 표준으로 채택하였다. MDA는 OMG가 지금까지 추진한 여러 표준화 작업을 바탕으로 한 모델 중심의 시스템 명세와 개발에 대한 것이다. OMG는 그 동안 CORBA를 통하여 구현 수준에서 기술간 상호 운영성과 시스템 통합을 다루어 왔다. OMG는 여기서 더 나아가 UML, MOF, CWM 등의 모델링 표준화 작업의 결과를 기반으로 한 MDA로 구현 수준에서 설계 수준으로 시스템 통합과 기술간 상호 운영성 문제 해결을 시도한다. 본 고에서는 MDA에 대한 개괄적 설명과 함께 MDA의 기반을 이루는 관련 표준에 대해서 알아보고 그 현재 상황을 살펴본다.

AR/VR 및 차세대 디스플레이를 위한 양자점 패터닝 연구 동향

김우식,오승주 한국정보디스플레이학회 2023 인포메이션 디스플레이 Vol.24 No.2

N-메틸화된 폴리(4-비닐피리딘)과 메틸오렌지동족체와의 상호작용에 있어서 무기전해질 첨가의 영향

김우식,서관호 경북대학교 산업기술연구소 1987 産業技術硏究誌 Vol.15 No.-

The binding of methyl orange and its homologs by N-methylated poly (4-vinylpyridine) has been investigated in the presence of sodium ch1-oride by the equilibrium dialysis method. The first binding constants and the Gibbs free energy changes for these binding systems were calculated in various concentrations of NaCl in order to clarify the effects of sodium chloride on the binding behaviors and to gain some insight into the nature binding energy. It was found that the first binding constants decreased with an increase in sodium chloride concentration and tend to approach a constant value above 0.4 mol NaCl. This might be due to the shielding of electric field around the binding system. The electrostatic force for the binding of methyl orange, ethyl orange, propyl orange by N-methylated poly (4-vinylpyridine) were estimated to be -1.97~-1.96㎉/㏖ and the other binding forces -4.31, -4.53, -4.78 ㎉/㏖ respectively. From these results, the calculated hydrophobic contribution for these binding systems were 69~71%. Therefore, the hydrophobic interaction seems to play an important role in these binding systems.