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Tandem Iminium/Copper Catalysis: Highly Enantioselective Synthesis of α,β‐Disubstituted Aldehydes
Kim, Ju‐,Hye,Park, Eun‐,Jin,Lee, Hwa‐,Jung,Ho, Xuan‐,Huong,Yoon, Hyo‐,Sang,Kim, Pilsoo,Yun, Hoseop,Jang, Hye‐,Young WILEY‐VCH Verlag 2013 European journal of organic chemistry Vol.2013 No.20
<P><B>Abstract</B></P><P>With the goal of synthesizing biologically and synthetically valuable products under environmentally benign and economic conditions, an asymmetric organocatalytic reaction was combined with a copper catalytic reaction. This iminium/copper catalysis allowed highly optically active α,β‐disubstituted aldehydes to be synthesized with good yields in one‐pot fashion. The β‐substitution took place through iminium‐catalyzed Michael addition of nitromethane or diethyl malonate to the α,β‐unsaturated aldehydes, followed by copper‐assisted addition of TEMPO (2,2,6,6‐tetramethylpiperidin‐1‐yloxyl) at the aldehyde α‐position. An iminium/copper‐catalyzed tandem addition product was converted into a 3,4,5‐trisubstituted piperidine for X‐ray crystallographic analysis.</P>
광열변위법에서 반무한 고체 모델을 이용한 고체재료의 열확산계수 측정
전필수(Pilsoo Jeon),김진화(Jinhwa Kim),김현정(Hyunjung Kim),유재석(Jaisuk Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The comprehensive model for the thermal diffusivity measurement using photothermal displacement method was developed. In previous works, the thermal diffusivities for solid metal with a finite sample thickness was determined by comparison between the calculated phase curve and the measured one. Therefore, primary error are caused by the finite sample thickness. In this study, a theoretical and experimental treatment of the photothermal displacement technique has been performed for thermal diffusivity measurement in semi-infinite solid materials. The measurement of thermal diffusivity using semi-infinite solid model have the more accurate value because the thickness effect does not exist. In results, the measured values for a semi-infinite materials have the accordance with the literature values within 1% standard deviation, while those for a finite materials show about 3% one.
Development of a minipig physical phantom from CT data
Park, Sooyeun,Lee, Pilsoo,Ha, Wi-Ho,Kim, Han Sung,Park, Byeong Ryong,Kim, Jae ,Seok,Shim, Sehwan,Park, Sunhoo,Kim, Young-su,Kim, Chan Hyeong,Jin, Young-Woo JAPAN RADIATION RESEACH SOCIETY 2017 JOURNAL OF RADIATION RESEARCH Vol.58 No.5
<P><B>ABSTRACT</B></P><P>Quantification of pathological progression of radiation-induced injury is essential in development of treatment methods, and a proper animal model is necessary for relevant radiological and medical studies. A minipig is a current animal model selected because of its similarities to humans in anatomy and pathology. In the present study, a minipig physical phantom was developed using computed tomography (CT) data. For dosimetry purposes, the minipig physical phantom was constructed on a slice-by-slice basis, with an array of holes to accommodate dosimeters. The phantom is constituted of three major organs, i.e. bone, lung, and remaining soft tissue, and the organs are clearly distinguishable on each 20-mm-thick axial slice. The quality of the tissue-equivalent (TE) substitutes was analyzed in terms of the atomic compositions and Hounsfield units (HUs). The density (in g/cm<SUP>3</SUP>) and effective atomic number of TE substitutes for the bone, lung, and soft tissue are 1.4 and 7.9, 0.5 and 10.0, and 1.0 and 5.9, respectively. Although the TE substitutes have slightly different physical properties, we think the phantom is acceptable because the HU values of the TE substitutes lie in the HU range of real tissues.</P>
리스크 매트릭스를 활용한 PSC박스 거더교의 긴장재 평가
김형조,지승구,김훈겸,김필수,정지승,이민재,Kim, Hyungjo,Ji, Seunggu,Kim, Hunkyom,Kim, Pilsoo,Kim, Hunkyom,Lee, Minjae 한국건설관리학회 2018 건설관리 : 한국건설관리학회 학회지 Vol.19 No.5
PSC 박스교에서 긴장재에 대한 조사는 체계적인 방법에 의해서 수행되어야 한다. 대표 긴장재 유형별로 위험 요인을 분석하고 장기적으로 위험도를 낮출 수 있도록 유지관리 계획이 수행되어야 할 예방적 유지관리 활동을 도출하는 것이 중요하다. 하지만 현 유지관리체계에서는 긴장재의 조사 및 보수보강을 위한 다양한 방법론이 연구되어 지고 있으나, 현실적으로 긴장재를 전수조사하는 것에는 어려움이 있다. 따라서 긴장재 선별에 대한 리스크 평가를 국내 PSC 박스교에 적용하기 위해 상태평가 및 유지관리체계에 맞춘 리스크 매트릭스 평가 지표를 제시하였다. In particular, the investigation of tendons in PSC Box Girder Bridge should be done in a systematic way. It is important to identify preventative maintenance activities that should be carried out in order to analyze the risk factors by type of representative tensions and to reduce risks in the long term. However, in the current maintenance system, various methodologies for investigating and repairing tensions have been studied, but it is difficult to investigate precisely tensions. Therefore, to apply the risk assessment for screening of tensions to the domestic PSC Box Bridge, we presented a risk matrix evaluation index that is consistent with the state assessment and maintenance system.
광열편향법을 이용한 이방성 재료의 열전도계수 측정에 관한 이론적 연구
전필수(Pilsoo Jeon),김현정(Hyunjung Kim),유재석(Jaisuk Yoo) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
We have analyzed the three-dimensional thermal conduction in anisotropic materials using nonsymmetric-Fourier transforms. And a complete theoretical treatment of the photothermal deflection spectroscopy has been performed for thermal conductivity measurement in anisotropic medium. Thermal conductivity tensor was determined by the deflection angle and phase angle with the relative position between the heating and probe beams. The influence of the parameters, such as modulation frequency of the heating beam, the thermal conductivity tensor, was investigated.
GRADIENT TYPE ESTIMATES FOR LINEAR ELLIPTIC SYSTEMS FROM COMPOSITE MATERIALS
Youchan Kim,Pilsoo Shin Korean Mathematical Society 2023 대한수학회지 Vol.60 No.3
In this paper, we consider linear elliptic systems from composite materials where the coefficients depend on the shape and might have the discontinuity between the subregions. We derive a function which is related to the gradient of the weak solutions and which is not only locally piecewise Hölder continuous but locally Hölder continuous. The gradient of the weak solutions can be estimated by this derived function and we also prove the local piecewise gradient Hölder continuity which was obtained by the previous results.
R-404A/POE 오일 혼합물의 기-액 평형과 상용성에 관한 연구
전필수(Pilsoo Jeon),이광재(Kwangjae Lee),유재석(Jaisuk Yoo),김현정(Hyungjung Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The vapor-liquid equilibrium and miscibility measurement apparatus was developed and used to obtain data for refrigerant/oil mixture. The vapor-liquid equilibrium and miscibility data for R-404A/POE22 and R-404A/POE32 oil mixtures are obtained over the temperature range from -20 to 60℃ with 10℃ intervals and the oil concentration range from 0 to 90 wt%. Using the experimental data, an empirical model is developed to predict the temperature-pressure-concentration relations for R-404A/POE oil mixtures at equilibrium. In the R-404A/POE22 oil mixture, the average root-mean-square deviation between measured data and calculated results from the empirical model is 3.56% and in the R-404A/POE32 oil mixture, that is 3.24%. Flory-Huggins theory is also used to predict refrigerant/oil mixture behavior. Immiscibility for R-404A/POE22 oil mixture was observed all over the oil concentrations. Immiscibility for R-404A/POE32 oil mixture was observed at the 10~70 wt% of oil concentrations.