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( Sangyoon Chung ),( Ja Seol Koo ),( Kwang Seok Kim ),( Chang Bum Bae ),( Ji Kyoung Lee ),( Joo Hee Park ),( Seung Young Kim ),( Jong Jin Hyun ),( Sung Woo Jung ),( Bora Keum ),( Beom Jae Lee ),( Yoon 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background/Aims: Immunomodulators such as azathioprine (AZA) and 6-mercaptopurine (6-MP) have been used for induction and maintenance treatment of Crohn`s disease (CD) and have effect on decrease of the steroid dose in active CD. The aims of study is to evaluate the predictive factors of response to AZA/6-MP in patients with moderate to severe CD. Methods: Among total 1,499 patients registered on Crohn`s cohort in Korea, 1,382 were enrolled in this study. The medical records including baseline characteristics, location and type of CD, complications, treatment agents, and surgical treatments were reviewed retrospectively. The patients with AZA/6-MP treatments were divided into two groups according to the additional treatments such as biologic agents and/or surgical treatment. Univariate and multivariate analyses were conducted to evaluate the predictive factors of clinical response to immunomodulators. Results: Among 1,382 patients with CD, AZA/6-MP treatment was used in 926 (67.0%). Between two groups according to AZA/6-MP treatment, the treatment group was younger than the other group (mean age, 25.8 vs 32.4, p<.001). AZA/6-MP treatment was used more frequently in patients with ileocolonic CD (62.5% vs 45.4%, p=.007) and with perianal disease (29.5% vs 21.0%, p<.001). In 926 patients with AZA/6-MP treatment, 376 (40.6%) were treated with biologic agents and/or surgical treatment. Between two groups according to the result of AZA/6-MP treatment, the disease locations were significantly different (p=.007), although the disease behaviors were not different. Multivariate analysis revealed that the disease location (p=.003) and age at diagnosis (p=.029) were significantly associated with AZA/6-MP treatment failure. Conclusions: AZA/6-MP treatment is effective on induction and maintenance treatment in CD. However, early biologic treatment should be considered in young age, colonic CD, since their AZA/6-MP treatment is less effective.
김상윤(Sangyoon Kim),권상석(Sangseuk Kweon),박대규(Daekyu Park),전두환(Duhwan Chun),정일섭(Ilsup Chung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Since the knuckle, a core component for automobile suspension, directly supports the wheel, it needs strength and durability. Studies for improving durability of the knuckle have been done but most of them are focusing on knuckle for hollow type shape. The durability test has been conducted under a driving condition of lateral force mode, braking torque mode and steering input mode by using hydraulic actuator for spindle type steering knuckle of independent suspension applied for commercial vehicles. We’ve also carried out structural analysis and fatigue analysis by utilizing MSC.Patran, MSC.Nastran and MSC.Fatigue in order to compensate for weak parts of the knuckle upon the result of the test.
Lee, Jiyoul,Chung, Jong Won,Kim, Do Hwan,Lee, Bang-Lin,Park, Jeong-Il,Lee, Sangyoon,Hä,usermann, Roger,Batlogg, Bertram,Lee, Sang-Soo,Choi, Insil,Kim, Il Won,Kang, Moon Sung American Chemical Society 2015 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.137 No.25
<P>We report the observation of band-like transport from printed polymer thin films at room temperature. This was achieved from donor-acceptor type thiophene-thiazole copolymer that was carefully designed to enhance the planarity of the backbone and the resulting transfer integral between the macromolecules. Due to the strong molecular interaction, the printed polymer film exhibited extremely low trap density comparable to that of molecular single crystals. Moreover, the energy barrier height for charge transport could be readily reduced with the aid of electric field, which led formation of extended electron states for band-like charge transport at room temperature.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2015/jacsat.2015.137.issue-25/jacs.5b04253/production/images/medium/ja-2015-04253w_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja5b04253'>ACS Electronic Supporting Info</A></P>
건설사업관리자의 BIM 수용에 영향을 미치는 요인 연구
정용채,진상윤,Chung, Yongche,Chin, Sangyoon 한국건설관리학회 2015 건설관리 : 한국건설관리학회 학회지 Vol.16 No.3
CM과 BIM은 건축물 전 생애주기 동안 발생되는 정보를 통해 각 분아별 협업체계 구축 및 업체 간의 원활한 의사소통을 해주는 유사점이 있으며 BIM은 CM의 업무수행과 서비스의 가치 향상을 위한 효과적인 정보관리도구로 활용될 수 있다. 그러나 CM에서 BIM 도입과 활용은 아직도 매우 제한적이다. 본 연구의 목적은 BIM 도입에 대한 CMr의 의도를 분석하고 CMr관점에서 효과적인 BIM 사용을 위한 전략을 수립하는 것이다. 본 연구는 TAM방법을 사용하였으며 다음과 같은 결과를 도출하였다. 1) CMr는 현재 BIM을 통해 자신의 인지도 향상, 경쟁력 및 역량 강화와 같은 이미지 향상 보다는 현재 자신의 업무에서 BIM이 적용되는 것이 사회적으로 요구되고 있는지를 중요하게 생각하고 있다. 2) BIM을 연계할 수 있는 업무를 도출하여 BIM을 활용할수 있는 업무프로세스를 구축하는 것이 중요하다고 생각하고 있다. 3) CMr가 BIM의 수용과 인식에 대해서는 궁극적으로는 받아들이지만 실제적인 업무에서 BIM 사용과 시도는 주저하고 있는 것으로 판단된다. 이와 같은 결과를 바탕으로 CM관점에서 BIM 활용 전략 수립 방향을 제시하였다. Construction Management(CM) and Building Information Management(BIM) have a lot in common that they need to establish a cooperation system among different disciplines and promote smooth communication among project stakeholders throughout the project life-cycle. BIM can be an effective information management tool for CM's business and improve their service value. However, BIM uses by Construction Managers(CMr) are very limited. The objective of this study is to analyze the intention of CMrs to adopt BIM and establish effective BIM use strategy in the CMr's point of view. This study utilizes Technology Acceptance Model(TAM) as a research method, and the results show that 1) CMrs think it is more important whether BIM is required to be adopted in their business process at the social or industry level than that BIM can improve their personal competence, recognition, and impressions through their voluntary BIM adoption; 2) that CMrs think it is important to figure out business processes where BIM can be smoothly incorporated; and 3) that CMrs hesitate the use and trial of BIM in their realworld business although they agree that BIM needs to be eventually adopted in their business in the future. Based on these results, directions for establish a strategy for BIM adoption were proposed at the CMr's point of view
윤수원,진상윤,김예상,정영수,정문헌,박순찬 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
Progress rate is one of the important factors that represent the performance and the status of a project through quantitative measurements of construction works performed. However, measuring progress rate has not been based on the collection of objective data and not based on the objective criteria either. Rather, since it has been dependent on one's subjective judgement or has included only the works measurable, it has been very difficult to assure the accuracy of a progress rate measurement in a construction project. Therefore the objective of this study is to propose a model that can improve the accuracy of a progress rate measurement by incorporating different measurement methods depending on the characteristics of unit work types. This research is still on-going at this point, however, this paper includes discussions on the development of the progress measurement method model along with analysis of literature survey and interviews with construction practitioners.
국내외 BIM 기반 프로젝트 사례분석을 통한 BIM 적용 전략 도출
이상혁(Lee Sang-Hyuk),곽청(Kwak Chung),이경준(Lee Kyoung-Jun),신태홍(Shin Tae-Hong),진상윤(Chin SangYoon),김예상(Kim Yea-Sang) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(구조계)
Various BIM project cases from both domestic and abroad shows that BIM process applied into construction process can be a sophisticated method to make project stakeholders including owner, contractor and designer get benefit under the win-win strategy. US and Europe known as advanced countries have established general foundation which makes best use of potential advantages of BIM. However, Korea tends to focus on only application of successful elements obtained through BIM cases without establishing general foundation which helps conducting a BIM process. Based on case studies of both domestic and abroad BIM projects, this research will deduce fundamental components to efficiently run the BIM process and adoption strategy for better BIM application will derive from these components. The adoption strategy from this research is expected to be used as preceding system to construct process based on BIM.
Kim, Do Hwan,Lee, Jiyoul,Park, Jeong‐,Il,Chung, Jong Won,Lee, Wi Hyoung,Giri, Gaurav,Yoo, Byungwook,Koo, Bonwon,Kim, Joo Young,Jin, Yong Wan,Cho, Kilwon,Lee, Bang‐,Lin,Lee, Sangyoon WILEY‐VCH Verlag 2011 Advanced functional materials Vol.21 No.23
<P><B>Abstract</B></P><P>In order to fabricate polymer field‐effect transistors (PFETs) with high electrical stability under bias‐stress, it is crucial to minimize the density of charge trapping sites caused by the disordered regions. Here we report PFETs with excellent electrical stability comparable to that of single‐crystalline organic semiconductors by specifically controlling the molecular weight (MW) of the donor‐acceptor type copolymer semiconductors, poly (didodecylquaterthiophene‐<I>alt</I>‐didodecylbithiazole). We found that MW‐induced thermally structural transition from liquid‐crystalline to semi‐crystalline phases strongly affects the device performance (charge‐carrier mobility and electrical bias‐stability) as well as the nanostructures such as the molecular ordering and the morphological feature. In particular, for the polymer with a MW of 22 kDa, the transfer curves varied little (Δ<I>V</I><SUB>th</SUB> = 3∼4 V) during a period of prolonged bias stress (about 50 000 s) under ambient conditions. This enhancement of the electrical bias‐stability can be attributed to highly ordered liquid‐crystalline nanostructure of copolymer semiconductors on dielectric surface via the optimization of molecular weights.</P>
Lee, Kwang-Hee,Lee, Gae Hwang,Leem, Dong-Seok,Lee, Jiyoul,Chung, Jong Won,Bulliard, Xavier,Choi, Hyeonho,Park, Kyung-Bae,Kim, Kyu-Sik,Jin, Yong Wan,Lee, Sangyoon,Park, Soo Young American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.25
<P>The dynamic characterization of two green-sensitive organic photodetectors (OPDs) using nonfullerene small molecules is investigated by analyzing the electrical parameters based on the experimental results and the simulated data. The two OPDs comprise <I>N</I>,<I>N</I>-dimethyl quinacridone (DMQA) as the common donor and dibutyl-substituted dicyanovinyl terthiophene (DCV3T) or boron-subphthalocyanine chloride (SubPc) as respective acceptors. At the applied voltage of −5 V, the device composed of DMQA/SubPc shows a higher frequency response at 148.3 kHz, by 55 kHz higher than the device based on DMQA/DCV3T. The impedance spectroscopy results indicate that the former device exhibits the low resistance due to the high mobility and the low capacitance linked to the dielectric constant. According to the molecular quantum calculation, the linear structure of DCV3T may promote packing of adjacent molecules in the linear direction, resulting in a high polarizability. In contrast, the fused structure of SubPc leads to a decrease in reorganization energy, and its conical shape tends to counterbalance the net dipole at the axial position in the dimer packing configuration owing to the symmetry of the three-branched units in the molecular periphery, which are related to the high carrier mobility and the low dielectric constant. The OPD comprising SubPc, with the dynamic response surpassing the commercialization level of 100 kHz, also exhibits good static performance with an external quantum efficiency of 60.1% at the wavelength of 540 nm, which can be an interesting candidate for potential applications as image sensors.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-25/jp5028788/production/images/medium/jp-2014-028788_0008.gif'></P>
Youngjun Yun,Ajeong Choi,Suk Gyu Hahm,Jong Won Chung,Yong Uk Lee,Ji Young Jung,Joo-Young Kim,Jeong-Il Park,Sangyoon Lee,Jaewon Jang IEEE 2017 IEEE electron device letters Vol.38 No.5
<P>In this letter, we demonstrated a high performance organic thin-film transistor using thermally evaporated amorphous phase MoO<SUB>x</SUB> as a hole injection layer between metal electrodes and organic semiconductor. The fabricated organic thin-film transistors showed the field-effect mobility of 7 cm<SUP>2</SUP>/Vs in linear and saturation regimes and an ON/OFF current ratio of 10<SUP>7</SUP>. The MoO<SUB>x</SUB> hole injection layers significantly reduced the injection barrier from metal electrode, resulting in the improvement of ohmic contact properties of a synthesized thiophene-rich heteroacene, dibenzothiopheno [6,5-b:6',5'-f] thieno [3,2-b] thiophene p-type organic semiconductor, as compared with those with single metals. Furthermore, high performance organic thin-film transistors can be successfully realized with Al electrode, which is not suitable for p-type organic semiconductors due to its low work function by introducing a 75-nm-thick MoO<SUB>x</SUB> hole injection layer.</P>