Water network synthesis in refinery

Sungwon Hwang,Ian Moore 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.10

Minimizing fresh raw water and wastewater effluent produced by industry has rigorously been studied over the past two to three decades. However, most studies have focused on rather theoretical illustration with little consideration of technical constraints in industry. Furthermore, use of massive industry data significantly increases the complexity of the problem, and no research paper has covered such a case study with practical solutions. This paper reviews the latest technology of water network synthesis and its applications, and provides a detailed guideline of the whole study procedure with a reference to case study based from refinery complex. Two main methodologies of waterpinch technology and a mathematical optimization programming are reviewed individually, and they are applied to a case study. Economic and operational constraints are embedded into optimization of water network synthesis in order to provide more reliable and achievable solutions for the minimization of fresh water consumption and reduction of waste water effluents. This generic approach can be similarly applied to other industries such as petroleum, steel, and paper manufacturing.

Analysis of S-glutathionylated proteins during adipocyte differentiation using eosin-glutathione and glutaredoxin 1

( Sungwon Hwang ),( Sana Iram ),( Juno Jin Inho Choi ),( Jihoe Kim ) 생화학분자생물학회 2022 BMB Reports Vol.55 No.3

Protein S-glutathionylation is a reversible post-translational modification on cysteine residues forming a mixed disulfide with glutathione. S-glutathionylation, not only protects proteins from oxidation but also regulates the functions of proteins involved in various cellular signaling pathways. In this study, we developed a method for the detection of S-glutathionylated proteins (ProSSG) using eosin-glutathione (E-GSH) and mouse glutaredoxin 1 (mGrx1). ProSSG was efficiently and specifically labeled with E-GSH to form ProSSG-E via thiol-disulfide exchange. ProSSG-E was readily luminescent allowing the detection of ProSSG with semi-quantitative determination. In addition, a deglutathionylation enzyme mGrx1 specifically released E-GSH from ProSSG-E, which increased fluorescence allowing a sensitive determination of ProSSG levels. Application of the method to the adipocyte differentiation of 3T3-L1 cells showed specific detection of ProSSG and its increase upon differentiation induction, which was consistent with the result obtained by conventional immunoblot analysis, but with greater specificity and sensitivity. [BMB Reports 2022; 55(3): 154-159]

Production of butene and butadiene by oxidative dehydrogenation of butane over carbon nanomaterial catalysts

Sungwon Hwang,Sungwon Park,Yehwon Lee,Geon-Joong Kim 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.12

C4 alkenes are generally used to produce synthetic rubbers, plastics, and other important chemicals. Transition metal oxides are traditionally used as catalysts to produce C4 alkenes from n-butane by oxidative dehydrogenation (ODH). On the other hand, metal-free carbon nanomaterials are receiving much attention as catalysts for ODH due to their environmental benignity, corrosion resistance, and unique surface properties. In this work, a systematic methodology was designed to measure conversion of the reactants, selectivity to main products, and other catalytic performances of a set of carbon catalysts, including graphite and activated carbon. The experiments were carried out under a wide range of reaction conditions, and the reaction mechanism and kinetics were developed based on Marsvan Krevelen interpretation of the experimental results.

Achieving high strength and ductility in wire arc additive manufacturing Ti-6Al-2Sn-2Zr-2Mo-2Cr alloy by Interpass Peening

Sungwon Hwang(황성원),Guo Xian,Muralimohan Cheepu,Sang Myung Cho,Namhyun Kang(강남현) 대한용접·접합학회 2023 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2023 No.5

ZnO/ TiO₂ nanowire with AgCl-doped CdSe quantum dots arrays as electron transport layer for perovskite solar cells

Sungwon Hwang(황성원) 대한전자공학회 2020 대한전자공학회 학술대회 Vol.2020 No.8

Effect of Interlayer Peening Treatment on Microstructural and Mechanical Property behavior in Ti-6Al-4V and Ti-6Al-2Sn-2Zr-2Mo-2Cr Alloys

Sungwon Hwang,Guo Xian,Jimin Nam,Seonghoon Yoo,Byungrok Moon,Muralimohan Cheepu,Sang Myung Cho,Namhyun Kang 대한용접·접합학회 2023 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2023 No.10

저출산 극복을 위한 프랑스의 유아교육·보육정책 연구

황성원(Hwang, Sungwon) 한국열린교육학회 2020 열린교육연구 Vol.28 No.5

유럽에서 저출산 극복의 모범 국가, 프랑스 사례를 중심으로 우리나라의 저출산 문제를 해결하기 위해 프랑스의 가족정책과 유아교육·보육정책의 최근 변화를 살펴보는데 이 연구의 목적이 있다. Lejeune(2014)의 시작하기(débuter), 범주화 화기(étiqueter), 관계성 찾기(articuler), 통합하기(intégrer) 총 네 단계의 연구방법에 따라 자료를 분석하였다. 프랑스 가족정책의 핵심 실행기관 CAF의 가족지원 내용과 방법, 안정적인 육아 환경을 이루는 크레쉬(crèche)와 에콜 마테르넬(école maternelle)의 정책 특성을 조사하면서 최근의 유아교육·보육정책의 변화를 알아보았다. 앞으로 합계 출산율을 높이기 위해 우리나라가 어떠한 육아 환경을 갖추고, 어떤 정책을 도입 및 실행할 수 있는지 제안하였다. 프랑스의 유아교육·보육정책이 주는 시사점은 다음과 같다. 첫째, 포용적이고 독립적인 가족정책을 실천하는 점이다. CAF를 중심으로 다양한 유형의 가족에게 필요한 경제적, 사회문화적 가족정책을 펼치고 있다. 둘째, 안정적이고 다양한 육아환경을 구축하여 부모가 언제든지 이용할 수 있는 근거리 원칙의 소규모 시설을 설립한다. 셋째, 크레쉬와 에콜 마테르넬이 수행하는 원래의 기능을 유지하면서 연령에 따라 대상이 다른 두 기관 간 연계 및 협력을 더욱 활성화한다. 이러한 정책 방향에 대한 제언이 우리나라의 저출산 문제를 점차 해소하는데 조금이라도 기여할 수 있기를 기대해본다. This study examined the family support measures of France, which maintains the highest birth rate among the European countries, and surveyed crèche and école maternelle as the two major policies of childcare to discuss the recent changes in early childhood education and childcare policies. Also, it derived the implications of how CAF (the leading authority of family policies) supports families and how crèche and école maternelle influence Korea s childcare environment. This study suggested policies Korea could introduce to increase the birth rate and to support the well-rounded growth of young children from 0 to 6 years of age through childcare and education. The implications of France s early childhood education and childcare policies for Korea include the following: first, raising the direct government grants for young children.Second, establishing various types of childcare facilities near homes that are safe and reliable for parents of young children between the ages of 0 to 2. Third, it is necessary to suggest the capabilities young children should develop through play-based curriculum for children between 3 and 5. Taken together, these new standards should become the evaluation standards of early childhood education in Korea. It is hoped by the author that the aforementioned implications are accepted and executed to resolve Korea s extremely low birth rate issues.

인성교육을 실천하는 루소의 자연주의 교육론과 그 현재성

황성원(Hwang, Sungwon) 한국열린교육학회 2012 열린교육연구 Vol.20 No.4

루소는 『에밀』을 250년 전에 발간하였지만 우리 교육의 현실을 진단하고 대안을 찾는데 루소의 교육론이 매우 중요한 의미를 갖는다. 아동의 본성을 존중하고 소극적 교육을 실천하며, 자연을 통해 인간을 인간답게 키우는 교육은 인성교육 실천의 기반이 되고 있다. 이 연구는 루소의 생애를 우선적으로 살펴보고, 가상의 제자인 에밀의 성장기를 유아기, 아동기, 소년기로 구분하여 0세에서 15세까지의 단계별 교육론을 설명하였다. 또한 루소의 교육론이 갖는 현재적 의미를 논의하고자 19세기말과 20세기 초 유럽의 신교육 운동에 어떤 영향을 주었고, 어떠한 교육의 형태로 현존하는지 알아보았다. 우리나라 교육현장에서, 자연주의 교육사상을 강조했던 루소는 인성교육자로서 교육이론가와 실천가들에게 교육의 기본 원칙과 실천 방법을 상기시켜준다. Although Rousseau published “Emile” more than 250 years ago, his theory on childhood education is still significant in analyzing the reality of our education and in finding alternatives. It is the base of personality education in which people respect the nature of children, practice negative education, and nurture children to have a decent life through nature. This study examined the life of Rousseau, and explained theory on education from 0 to 15 years old by dividing infant period, childhood period and juvenile period of the life of Emile, his virtual disciple. The study then studied its influence on the new education movement in later 19th century and early 20th century in Europe, and how it exists today in order to discuss the nowness of Rousseau's education theory. Rousseau, who stressed the educational philosophy of naturalism, highlights the basic principle of education and its method to personality educators, education theorists and doers in the Korean educational field.

강화학습과 시각 어텐션에 따른 군중 시뮬레이션 구현

황성원(Sungwon Hwang),강형엽(Hyeongyeop Kang) 한국정보과학회 2023 한국정보과학회 학술발표논문집 Vol.2023 No.12

노인의 일상생활장애 정도에 따른 고령친화제품 분류 특성 연구

황성원 ( Hwang Sungwon ),모정현 ( Mo Jeong Hyun ),이윤희 ( Lee Yunhee ) 한국디자인트렌드학회 2011 한국디자인포럼 Vol.33 No.-

고령사회 진입을 앞두고 노년기의 생활의 질에 대한 관심이 점차 증가함에 따라 고령친화산업은 매우 확장 가능성이 큰 분야로 전망되고 있다. 그러나 고령친화제품은 제품별 기능과 성능 위주로 공급되어 정확한 사용방법과 가이드라인이 마련되어 있지 않다. 따라서 본 연구는 고령친화제품의 제품 분류 기준을 사용자의 일상생활장애 정도, 생활공간별 분류 기준틀을 제안한다. 이는 노화로 인한 일상생활수행능력이 떨어지는 노인들의 장애 정도에 따른 올바른 제품선택을 돕는 기준이 되고 고령친화제품체험관 전시체험 프로그램에 반영하여 좀 더 효율적인 정보전달이 가능하도록 한다. 이러한 연구결과는 생활공간별, 장애등급별 제품 개발의 필요성을 파악해 고령친화산업 발전방향 제시에 기초 자료로 활용될 것이다. In Korea, welfare needs brought on by the rapidly growing of elderly population. Also, the senior group with spare time, wealth and health is increasing. Currently, the people have known about needs welfare system for improving quality of life during senescence personally and socially. In addition to the senior friendly industry, having distinction with simple approach medical services, will be great expanding after 2010. And there will be a new welfare services plan supporting long term care insurance for senior citizens. But we don`t have prepared systematically organized senior friendly industry and products yet. So, the purpose of the study is to analyze systematically the classification characteristics of the senior friendly products according to the difficulty of daily living for senior citizens. Above all, the study finds out the senior friendly products characteristics according to the consumer`s various situations about health and housing space. Therefore the result of the study reveals that the simulation guidelines for choosing the products depend on the customer`s needs are essential and useful to improve senior friendly industry. And the post evaluation data of senior friendly products would be put to practical use in the industry.