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강희천(Hui-Cheon Kang),한병기(Byeong-Gi Han),김정대(Joung-Dae Kim),서승원(Seung-Won Seo),신철호(Chul-Ho Shin),박준석(Joon-Seok Park) 한국청정기술학회 2017 청정기술 Vol.23 No.3
본 연구는 오염현장에서 채취한 유류오염토양을 in situ 토양세정법으로 정화시 기술 적용성을 평가하기 위한 컬럼식 실험이다. 실험에 사용한 오염토양의 토성은 사토(sand)이었으며, 초기 TPH 오염농도는 9,369 mg kg<SUP>-1</SUP>이었다. 세정용액으로 0.1% Tween-80을 사용하였으며, 반응기로는 아크릴 원형컬럼과 유리 시린지컬럼을 사용하였다. 아크릴 원형컬럼 실험에서 0.1% Tween-80을 1 PV 주입하였을 때 토양 TPH의 35%가 제거되었고 이후 5 PV까지도 제거효율이 약 40% 정도로 큰 증가가 나타나지 않았으나 7 PV 주입하였을 때 약 60%가 제거되었다. 아크릴 원형컬럼 대신 유리 시린지컬럼을 사용하여 체류시간을 증가시키자 5 PV까지는 아크릴 원통컬럼을 사용한 경우보다 제거효율이 전반적으로 약 3 ~ 12% 높았으나 7 PV을 모두 주입하였을 때의 제거효율은 약 60%로 서로 차이가 없었다. 단독 alum과 alum+polymer 혼합응집제를 사용하여 폐세정액을 응집처리한 결과 최적 주입농도는 두 경우 모두 150 mg L<SUP>-1</SUP>인 것으로 나타났다. 응집처리한 Tween-80 폐세정액에 Tween-80을 0.1% 농도로 새로 용해하여 재사용 세정을 실시한 결과의 제거효율은 41.0%로 재사용하지 않은 0.1% Tween-80의 32.0% 보다 약 9% 높게 나타났다. This study was conducted to evaluate the feasibility of in situ soil flushing for TPH-contaminated soil remediation with column test. The soil texture of the soil was sand and the initial TPH concentration was 9,369 mg kg<SUP>-1</SUP>. 0.1% Tween-80 was selected as surfactant solution. And the acrylic and the glass syringe columns were used as reactors. In the acrylic column test, 35% of the initial TPH was removed in 1 PV of flushing and approximately 40% in 5 PV and finally 7 PV showed about 60%. The glass column test showed 3 ~ 12% higher removal efficiency than that of acrylic test until 5 PV of flushing. However, there was no difference in TPH removal efficiency when 7 PV of surfactant was finally flushed. Both of alum only and alum+polymer mixed surfactants showed also the best coagulation efficiency in 150 mg L<SUP>-1</SUP> of concentraion. When Tween 80 was newly dissolved in 0.1% to the recovered solution after the coagulation treatment, the removal efficiency was increased from 32.0% to 41.0% in comparison to the new 0.1% Tween 80 solution without reuse by coagulation treatment.
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한국 서해 참조기(Larimichthys polyactis)의 육안판별법과 GSI판별법에 의한 성숙체장 추정
강희중 ( Heejoong Kang ),마지영 ( Ji Young Ma ),김현지 ( Hyeon Ji Kim ),김한주 ( Han Ju Kim ) 한국수산과학회(구 한국수산학회) 2020 한국수산과학회지 Vol.53 No.1
Determination of the precise size at sexual maturity is very important for science-based stock assessment and fisher ies resource management. In this study, two different models, (1) a visual method and (2) a gonadosomatic index (GSI) method, were employed to estimate length at sexual maturity of the small yellow croaker Larimichthys polyac tis in the Yellow Sea of Korea. The visual method is a common qualitative method using visual gonadal identification. Conversely, the GSI method is a quantitative method using the GSI, which can be easily and precisely collected. We compared results from these methods to determine the best approach, and to examine the practicality of the GSI meth od. Logistic regression of the maturity ogive was conducted using a general linear model (GLM) with the R statistics program. Also, the bootstrapped 95% confidence intervals of all estimates were calculated. The best-fit model was the visual method (R<sub>Mc</sub> <sup>2</sup> =0.805, AUC=0.989, L<sub>50</sub>=15.1). Among models using the GSI method, the model computing GSIref=0.94 was the best-fit model (R<sub>Mc</sub> <sup>2</sup> =0.792, AUC=0.989, L<sub>50</sub>=15.2). There was no significant difference between the two models, evidencing the effectiveness and accuracy of the GSI method.
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강희석,이한수,정흥석,안도희,손순환,정양근,송명재 ( Hee Suk Kang,Han Soo Lee,Hongsuk Chung,Do Hee Ahn,Soon Hwan Son,Yang Geun Chung,Myung Jae Song ) 한국공업화학회 1996 공업화학 Vol.7 No.4
중수형 발전소에서 삼중수소 제거 공정에 이용되는 소수성 고분자촉매의 담체인 스티렌-디비닐벤젠 공중합체의 제조 특성을 실험하였다. 스티렌-디비닐벤젠 고분자담체의 제조시 담체의 표면 특성에 대한 용매의 영향을 고찰하기 위하여 일정한 용매계에서 용매비를 변화시켜 solvating power 값을 구하였다. 거시기공 형태의 담체가 제조되기 위한 solvating power는 가교도가 20%일 때 3 이상, 가교도가 40%일 때는 1 이상의 값이 필요하였으며 약 40℃에서 2시간 이상 용액의 안정이 필요하였다. 또한 후처리 방법은 담체를 건조시키기 전에 용매를 제거하는 방법이 가장 우수한 기공 특성을 나타내었다. 담체의 입자 크기는 교반속도 및 계면활성제의 농도가 낮을수록 더 크게 생성됨을 알 수 있었다. This study represents the synthetic characteristics of styrene-DVB copolymer which is used as a catalyst support for the removal of tritium in CANDU. To evaluate the effect of solvent on the styrene-DVB polymeric support, the solvating power dependent on various kinds and composition of solvents was calculated. In order to synthesize the macroreticular type polymer bead, the following conditions are needed; solvating power should be higher than 1 for 20% of crosslinkage and higher than 3 for 40% of crosslinkage. Stabilization of organic monomers at about 40℃ for more than 2 hours is prerequisite. Removal of solvent prior to drying is preferred for the post-treatment of the bead. The polymer particle size was increased by lowering concentration of surfactant and stirring speed.
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강희정,박은철,이규식,박태규,정우진,김한중,Kang, Hee-Chung,Park, Eun-Cheol,Lee, Kyu-Sik,Park, Tae-Kyu,Chung, Woo-Jin,Kim, Han-Joong 대한예방의학회 2005 예방의학회지 Vol.38 No.1
Objectives : We analyzed the changes from 1996 to 2002 in distributive equity of the contribution burden in the Korean National Health Insurance. Methods : The study subjects were a total of 8,923 employee households and a total of 7,296 self-employed households over the period from 1996 to 2002. Those were the households meeting the two criteria as completing each annual survey and having no change in the job of head of the household during that period from the raw data of the Household Income and Expenditure Survey annually conducted by the Korean National Statistical Office. The unit of analysis was a household, and this was the standard for assessing the contribution that is now applied on a monthly basis. Deciles Distribution Ratio, Contribution Concentration Curve and Contribution Concentration Index were estimated as the index of inequality. Multiple regression analysis was conducted to compare the annual ability-to-pay elasticity of the contribution to the reference year of 1996 for three groups (all households, the employee households, and the self-employed households). Results : For the index of inequality, the distributive equity of contribution was improved in all three groups. In particular, the employee group experienced a substantial improvement. Using multiple regression analysis, the ability-to-pay elasticity of the contribution in the employee group significantly increased ($\beta$=0.232, p<0.0001) in the year 2002 as compared to the reference year of 1996. The elasticity in the self-employed group also significantly increased ($\beta$=0.186, p<0.05), although its change was smaller than that in the employee group. Conclusions : The employee group had a greater improvement for the distributive equity of the contribution burden than the self-employed group. Within the observation period, there were two important integration reforms: one was the integration of 227 self-employed societies in 1998 and the other was the integration of 139 employee societies in 2000. We expected that the equity of the contribution burden would be improved for the self-employed group since the integration reform of 1998. However, it was not improved for the self-employed group until the year 2000. This result suggests that capturing exactly the beneficiaries' ability-to-pay such as income is the precedent for distributive equity of the contribution burden, although a more sophisticated imposition standard of contribution is needed.
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[차량운동성능부문] 차체 구조의 중형 버스 브레이크 저더에 대한 영향 해석
강희용(Heeyong Kang),양성모(Sungmo Yang),김종규(Jongkyu Kim),한갑수(Kapsu Han),이동헌(Dongheon Lee) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In the high speed driving conditions, the vibrational phenomena with relation to chassis system are becoming more important factors in chassis design and development. In this paper, to verify the effects of a body structure in brake judder, body structure is modeled in flexible. Mode shapes and frequencies are obtained from Commercial FEA program in the same condition of experimental test. Commercial dynamic program is used to model and analyse a middle size bus for brake judder phenomenon. The simulation results are compared to the experimental results and summarized
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강희정(주저자) ( Hee Jung Kang ),한현석(교신저자) ( Hyun Suk Han ) 디자인융복합학회 2016 디자인융복합연구 Vol.15 No.3
본 연구는 디자인창업 교육에 있어 무엇을 가르쳐야 하는지에 대한 연구로, 디자인분야에서 체계적인 창업교육과정을 설계하는데 기틀이 되고, 디자인전공자들에게 적합한 교과 내용을 도출하고자 하였다. 본 연구의 목적을 달성하기 위하여, 첫째, ‘디자인 전공자에게 필요한 창업 지식 및 기술은 무엇이 있는가.’ 둘째, ‘디자인 전공 여부에 따라 창업에 필요한 창업 지식 및 기술의 중요도가 차이가 있는가.’로 연구 문제를 설정하였다. 연구 방법으로 설문조사를 실시하여 자료를 수집하였고, 그 결과에 대하여는 기술 통계 분석과 빈도 분석을 진행하였다. 연구 결과, 첫째, 연구 문제 1에 대하여 창업자는 문제해결능력, 창조성과 혁신적 사고, 자금 조달과 운영, 사업타당성분석 등의 순으로 필요한 창업 지식 및 기술을 나타냈고, 예비창업자의 결과는 상이하였다. 둘째, 연구 문제 2의 결과 역시 디자인전공자의 창업자와 비(非)디자인전공자의 창업자가 필요로 하는 창업 지식 및 기술 역시 상이함을 알 수 있었다. This research is to extract the course of study required in curriculums for design based start-up which will become the foundation for designing systematic start-up education programs in design field by constructing appropriate curriculums to students majoring in design. For achieving the purpose of the research, research subjects are constructed based on 1) the needed knowledge and skill for start-ups for design major students, and 2) importance in start-up knowledge and skills based on design majors. Survey was performed for collecting needed materials, and descriptive statistic analysis, frequency analysis was followed for analysing the results. As a result, for the subject 1)entrepreneurs put more importance on problem solving, creativity/innovative thinking, financing/operation, project feasibility in sequence, and prep entrepreneurs have different opinions. Also, there are different opinions on start-up knowledge and skills between design major entrepreneurs and non-design major entrepreneurs on the subject 2).
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