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SeungYong Choi,Shivshankar Chaudhari,HyeonTae Shin,조계용,이동욱,MinYoung Shon,남승은,박유인 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
In reference, the mussel-encouraged surface adhesion chemistry, dopamine oxidative autopolymerizationon the surface of halloysite nanotubes (HNTs) was performed to confer hydrophilicityto the HNTs. The additional hydrophilic moieties with surface coating by polydopamine (PDA) wasassured with transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and X-ray photoelectronspectroscopy (XPS) techniques. A PDA/HNT-incorporated polyvinyl alcohol/polyvinyl amine(PVA-PVAm) membrane was fabricated for the pervaporation-dehydration of isopropanol/water (IPA/water),and the filler dispersion, crystallinity, and hydrophilicity of the membrane were confirmed by fieldemissionscanning electron microscopy (FE-SEM), X-ray diffraction (XRD), and contact angle measurements,respectively. The pervaporation test was performed with membranes having different PDA/HNTcontents, where the flux increased from 0.19 to 0.39 kg/m2h, and the separation factor decreased from479 to 63 with the 80/20 (w/w, IPA/water) feed mixture at 40 C. Compared to the unmodified HNTincorporatedmembrane, the membrane with 5 wt.% PDA/HNT exhibited superior performance. Uponincreasing the feed (85/15 IPA/water w/w) temperature from 40 to 70 C, the flux of water and IPAincreased from 0.062 to 0.13 kg/m2h and 0.000063 to 0.00144 kg/m2h, respectively. The apparent energyof activation calculated using the Arrhenius equation was positive for both IPA and water. The higherenergy required for permeation of IPA (99.65 kJ/mol) compared to water (22.69 kJ/mol) is attributed tofacile permeation of water compared to IPA through the hydrophilic channel created by PDA-HNT. Inlong-term operation (120 h), the IPA and water flux of the 5 wt.% PDA/HNT-incorporated PVA-PVAmmembrane was maintained using a feed composition of 80/20 (w/w %) IPA/water at 40 C, indicatingremarkable reusability of the membrane.
온톨로지 개발 방법론 분석 비교 : CMMI 버전 1.1 성숙 단계 2와 3을 기반으로
최승용(SeungYong Choi),김정아(JeongAh Kim),정란(Ran Jung),배제민(JeMin Bae),홍찬기(ChanKi Hong),최성운(SungWoon Choi) 한국정보과학회 2007 정보과학회논문지 : 소프트웨어 및 응용 Vol.34 No.12
시맨틱 웹(semantic web), 지식 경영 요구가 증대되면서 온톨로지 개발이 활발하게 이루어지고 있다. 온톨로지 역시 대규모 소프트웨어를 개발하는 것과 동일하게 체계적인 개발 표준이 필요한 시점에 있다. 그러나 아직 온톨로지 개발 방법론의 체계화 및 표준화는 이루어지고 있지 않은 상황이다. 본 연구에서는 온톨로지 개발 방법론의 비교를 위해 외국의 대표적인 온톨로지 개발 방법론(METHONTOLOGY, CommonKADS, OTK)과 국내 온톨로지 개발 방법론(EOE)을 선정했다. 평가 방법은 CMM-I 버전 1.1 프레임워크를 도입하여 CMM-I 성숙 단계 2와 3에 해당하는 프로세스 영역별로 온톨로지 개발 방법론을 평가했다. 본 연구의 목적은 프로세스 성숙도(CMM-I) 관점으로 평가 대상의 온톨로지 개발 방법론에 대해 성숙된 프로세스 영역과 취약한 프로세스 영역을 파악하고 온톨로지 개발 방법론의 개선 영역을 제시하는 것이다. 본 연구의 결과는 온톨로지 개발 방법론의 수립 또는 개선의 기초 자료로 활용할 수 있다. As the requirement of Semantic Web and knowledge management has been rising, ontology developments have been carried out actively. Ontology is now at the point that systematic developing standardization should be made up like the developing a large scale software. Yet, It has not been made to optimize and standardize ontology development methodologies. In this study, to compare ontology development methodologies, METHONTOLOGY, CommonKADS, OTK in foreign countries and EOE in Korea are selected. The evaluating method is to introduce CMM-I version 1.1 framework. Ontology development methodologies have been evaluated in process areas that introduce for CMM-I maturity level 2 and 3. The purpose of this study is to find matured process and weak process in ontology development methodology on the view of process maturity, and suggests the areas to be improved in it. The result of this study can be applied as basic data to establish and improve ontology development methodology.
최승용 ( Seungyong Choi ),김순태 ( Suntae Kim ),김정아 ( Jeongah Kim ) 한국정보처리학회 2015 한국정보처리학회 학술대회논문집 Vol.22 No.1
IT 환경이 점차 융·복합화가 되어가면서 소프트웨어 개발 업체들은 다양해진 소프트웨어 개발 영역에 맞춰 소프트웨어 프로세스를 신속하게 적용하는 데 어려움을 겪고 있다. 이와 같은 문제를 해결하고자 본 논문에서는 소프트웨어 개발 업체들이 구축해 놓은 소프트웨어 프로세스 자산을 재사용해 특정 소프트웨어 개발 프로젝트에 적용할 소프트웨어 프로세스를 효율적으로 수립할 수 있는 체계적인 소프트웨어 프로세스 테일러링 절차를 제시한다. 제시한 소프트웨어 프로세스 테일러링 절차를 도입하는 소프트웨어 개발 업체는 소프트웨어 개발 영역에 특화된 소프트웨어 프로세스를 빠르게 수립할 수 있게 됨으로써 정의한 소프트웨어 프로세스를 통해 소프트웨어 개발 프로젝트의 위험 요인들을 사전에 인지할 수 있게 되고 소프트웨어 개발 프로젝트가 예측 불가능한 상태로 진행되는 것을 미연에 통제할 수 있게 될 것으로 예상된다.
Anaerobic co-digestion of high-strength organic wastes pretreated by thermal hydrolysis
Choi, Gyucheol,Kim, Jaai,Lee, Seungyong,Lee, Changsoo Elsevier 2018 Bioresource technology Vol.257 No.-
<P><B>Abstract</B></P> <P>Thermal hydrolysis (TH) pretreatment was investigated for the anaerobic digestion (AD) of a mixture of high-strength organic wastes (i.e., dewatered human feces, dewatered sewage sludge, and food wastewater) at laboratory scale to simulate a full-scale plant and evaluate its feasibility. The reactors maintained efficient and stable performance at a hydraulic retention time of 20 days, which may be not sufficient for the mesophilic AD of high-suspended-solid wastes, despite the temporal variations in organic load. The addition of FeCl<SUB>3</SUB> was effective in controlling H<SUB>2</SUB>S and resulted in significant changes in the microbial community structure, particularly the methanogens. The temporary interruption in feeding or temperature control led to immediate performance deterioration, but it recovered rapidly when normal operations were resumed. The overall results suggest that the AD process coupled with TH pretreatment can provide an efficient, robust, and resilient system to manage high-suspended-solid wastes, supporting the feasibility of its full-scale implementation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A full-scale TH-AD plant was simulated in two lab-scale reactors run in parallel. </LI> <LI> TH pretreatment effectively solubilized a mixture of high-suspended-solids wastes. </LI> <LI> The reactors maintained efficient and stable performance at 20-d HRT for 8 months. </LI> <LI> FeCl<SUB>3</SUB> addition reduced H<SUB>2</SUB>S and greatly affected the microbial community structure. </LI> <LI> The reactors were highly resilient to interrupted feeding and temperature failure. </LI> </UL> </P>