http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Park, Sang-Hee,Kwon, Soon Jin,Shin, Min Gyu,Park, Min Sang,Lee, Jong Suk,Park, Chul Ho,Park, Hosik,Lee, Jung-Hyun Elsevier 2018 Desalination Vol.436 No.-
<P><B>Abstract</B></P> <P>A polyamide (PA) thin film composite (TFC) reverse osmosis (RO) membrane having high permselectivity and excellent mechanical/chemical durability was prepared using a polyethylene (PE) support. Although the PE support's uniform pores and high surface porosity are beneficial for enhancing membrane permselectivity, its intrinsic hydrophobicity makes the fabrication of a PA selective layer challenging. An oxygen plasma treatment on the PE support, combined with using a sodium dodecyl sulfate (SDS) during interfacial polymerization, allowed a PA layer to be formed on the support due to by enhancing its water wettability. The systematic optimization of the membrane fabrication parameters (<I>e.g.</I>, plasma pretreatment, monomer and SDS compositions and post-heat treatment) achieved high membrane performance. The fabricated PE-supported membrane (TFC-PE) showed ~30% higher water flux with ~0.4% enhancement in NaCl rejection compared to a commercial RO membrane. Furthermore, the TFC-PE membrane had mechanical properties and organic solvent resistance superior to the commercial membrane, which is attributed to the excellent mechanical and chemical stability of the PE material. The proposed strategy could expand the application of RO membranes to mechanically and chemically harsh operating environments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TFC RO membranes are fabricated using porous polyethylene supports. </LI> <LI> The high surface porosity of the PE support is favorable for enhancing water flux. </LI> <LI> Optimized interfacial polymerization produces a highly permselective layer. </LI> <LI> The PE-TFC membrane shows RO performance exceeding a commercial membrane. </LI> <LI> The PE-TFC membrane has superior mechanical/chemical durability to a commercial one. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Sung-Joon,Kwon, Soon Jin,Kwon, Hyo-Eun,Shin, Min Gyu,Park, Sang-Hee,Park, Hosik,Park, You-In,Nam, Seung-Eun,Lee, Jung-Hyun Elsevier 2018 Polymer Vol.144 No.-
<P><B>Abstract</B></P> <P>We report an aromatic solvent-assisted interfacial polymerization (IP) method to prepare high performance thin film composite reverse osmosis (RO) membranes based on a polyacrylonitrile support. The use of toluene and xylene as an organic solvent phase led to excellent water flux and unprecedentedly high NaCl rejection (∼99.9%), exceeding both the control membrane prepared using a conventional aliphatic solvent (<I>n</I>-hexane) and commercial RO membranes. The membrane prepared using <I>n</I>-hexane had a thick and moderately dense PA layer, due to the limited amine monomer diffusion, accounting for its relatively low performance. In contrast, the membranes fabricated using toluene/xylene had roof-like structures covering a thin and highly dense basal PA layer, which was formed by increased amine diffusion and an expanded miscible interface zone resulting from the enhanced miscibility of toluene/xylene with water. The excellent membrane performance achieved using toluene/xylene can be attributed to the thin and highly cross-linked basal PA layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> TFC RO membranes are fabricated using aromatic organic solvents (toluene/xylene). </LI> <LI> The prepared membranes show RO performance exceeding commercial membranes. </LI> <LI> The prepared membranes exhibit unprecedentedly high NaCl rejection (∼99.9%). </LI> <LI> Aromatic solvents greatly promote MPD diffusion by increased miscibility with water. </LI> <LI> An ultrathin and highly dense PA layer is formed even on a hydrophilic PAN support. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Park, Hosik,Jung, Hyunsung,Zhang, Miluo,Chang, Chong Hyun,Ndifor-Angwafor, N George,Choa, Yongho,Myung, Nosang V RSC Pub 2013 Nanoscale Vol.5 No.7
<P>Electrospinning and galvanic displacement reaction were combined to synthesize ultra-long hollow tellurium (Te) nanofibers with controlled dimensions, morphology and crystallinity by simply tailoring the electrolyte concentration applied. Within different morphologies of nanofibers, the branched Te nanostructure shows the greatest sensing performance towards NO2 at room temperature.</P>
나이브 베이지안 분류기와 MapReduce 를 이용한 SNS 문서 필터링 및 토픽 예측
박호식 ( Hosik Park ),강남용 ( Namyong Kang ),박슬기 ( Seulgi Park ),문정민 ( Jungmin Moon ),오상윤 ( Sangyoon Oh ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
SNS(Social Network Service)는 새로운 소통수단으로 인적 네트워크뿐만 아니라 사회,문화 등에 많은 영향을 미치고 있다. 특히, 무선인터넷과 스마트폰의 보급으로 정보유통량이 기하급수적으로 증가하면서, 데이터를 처리 및 분석하는 것이 화두가 되고 있다. 본 논문에서는 급증하는 SNS 데이터를 처리 및 분석하여 의미 있는 데이터를 키워드 중심으로 추출하고자 하였다. 이를 위해 기존 데이터 처리방식이 아닌 빅데이터 처리에 적합한 MapReduce 환경에서 SNS 데이터를 필터링하고, 토픽을 예측하기 처리방법을 제시하였다. 또한,웹 서비스를 기반으로 구현하여 분석된 데이터를 시각적으로 표현하고, 재생산하였으며, 실험을 통해 제안하는 처리방법의 성능을 검증하였다.