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전성제 ( Sungje Jeon ) 한국보건사회연구원 2021 국제사회보장리뷰 Vol.17 No.-
최근 영국에서는 주택 가격 급등과 부실한 사회주택 관리 등으로 주택 문제가 중요한 이슈로 대두되었다. 이에 따라 영국 정부는 코로나바이러스감염증-19(이하 코로나19) 팬데믹으로 인한 가구소득 감소, 주거 불안 심화, 신규 주택 건설을 포함한 주택산업 침체가 주택 부문에 미칠 부정적 영향을 최소화하기 위하여 세입자 강제 퇴거절차의 한시적 중지, 모기지 연체로 인한 주택 압류 금지 및 상환 일시 유예 등 주거 안정을 위한 정책을 신속하게 도입하였다. 또한 주택산업 침체를 막기 위한 수요자 지원 정책으로 취등록세 감면 정책도 시행하였다. 이러한 영국 사례는 일시적이고 급격한 여건 변화에 대응한 주거정책 수립과 관련하여 우리나라에도 유용한 시사점을 제공할 수 있을 것이다.
남종민,Sungje Jeon,김재근 한국생태학회 2007 Journal of Ecology and Environment Vol.30 No.4
Nest density was determined and tree and soil characteristics around Nycticorax nycticorax breeding sites and non-breeding sites on Bamsum Island in Seoul were analyzed from May 2005 to October 2006 to identify breeding site preferences of N. nycticorax and the effects of N. nycticorax nesting density on nesting tree structure and soil characteristics. N. nycticorax preferred trees of low height (3.5~6 m) and small diameter at breast height in high density Salix communities. Excrement of heron juveniles was dropped on the soil under the nests. The soil nutrient content under nests (P: 126.0 mg/kg, N: 202.8 mg/kg, EC: 549 μS/cm, pH 4.7) was much higher than that of control soils from Bamsum Island not enriched by heron excrement (P: 41.5 mg/kg, N: 42.0 mg/kg, EC: 342 μS/cm, pH 5.1). Formation of Salix communities on the shores of Bamsum Island is ongoing, and their structure has been directly influenced by annual flooding. After flooding, the nutrient content differences between heron-affected soils and control soils were not significant. This might be the reason that Salix communities on Bamsum were not affected by nesting herons as in other terrestrial communities where herons nest. This result indicates that flooding plays an important role in sustaining Salix communities on Bamsum Island where herons nest. The results of this study may increase understanding of N. nycticorax breeding behavior which may be useful for conservation planning.
Dash Isolation Pad를 구성하는 흡차음재 물성 최적화를 통한 중량저감
전주현(Juhyun Jeon),이형래(Hyeongrae Lee),이정욱(Jungwook Lee),김성제(Sungje Kim),한진우(Jinwoo Han),강연준(Yeonjune Kang) 한국소음진동공학회 2015 한국소음진동공학회 학술대회논문집 Vol.2015 No.4
The primary purpose of this study is to reduce the weight of the vehicle dash isolation pad by optimizing the property of acoustic material through Taguchi’s method. Dash isolation pad is a pressed acoustic material layers that is installed between a vehicle’s cavity room and the dash panel to improve the sound transmission loss to the cabin. Generally, dash isolation pad consists of polyethylene terephthalate, polyurethane foam, heavy layer and etcetera. In this study, SEA, a CAE software, is used to analyze the performance of the dash isolation pad and Taguchi’s L18 orthogonal matrix array is used to optimize the weight. As a result, the transmission loss of dash isolation pad is slightly increased and the 500g weight loss is achieved.
Super-resolution visible photoactivated atomic force microscopy
Lee, Seunghyun,Kwon, Owoong,Jeon, Mansik,Song, Jaejung,Shin, Seungjun,Kim, HyeMi,Jo, Minguk,Rim, Taiuk,Doh, Junsang,Kim, Sungjee,Son, Junwoo,Kim, Yunseok,Kim, Chulhong Nature Publishing Group 2017 Light, science & applications Vol.6 No.11
<P>Imaging the intrinsic optical absorption properties of nanomaterials with optical microscopy (OM) is hindered by the optical diffraction limit and intrinsically poor sensitivity. Thus, expensive and destructive electron microscopy (EM) has been commonly used to examine the morphologies of nanostructures. Further, while nanoscale fluorescence OM has become crucial for investigating the morphologies and functions of intracellular specimens, this modality is not suitable for imaging optical absorption and requires the use of possibly undesirable exogenous fluorescent molecules for biological samples. Here we demonstrate super-resolution visible photoactivated atomic force microscopy (pAFM), which can sense intrinsic optical absorption with ~8 nm resolution. Thus, the resolution can be improved down to ~8 nm. This system can detect not only the first harmonic response, but also the higher harmonic response using the nonlinear effect. The thermoelastic effects induced by pulsed laser irradiation allow us to obtain visible pAFM images of single gold nanospheres, various nanowires, and biological cells, all with nanoscale resolution. Unlike expensive EM, the visible pAFM system can be simply implemented by adding an optical excitation sub-system to a commercial atomic force microscope.</P>
전기자동차 히트펌프용 수열원 응축기 성능 특성에 관한 연구
이호성(Hoseong Lee),전한별(Hanbyeol Jeon),조중원(Choongwon Cho),임택규(Taekkyu Lim),이성제(Sungje Lee),남광우(Kwangwoo Nam) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The performance characteristics of coolant-source plate heat exchanger for heat pump system in electric vehicles was studied experimentally. In order to analyze plate heat exchanger with the coolant operating PE(Power Electronics) thermal management, coolant conditions was varied with respect to temperature, volume flow rate. Because the refrigerant in MAC(Mobile Air Conditioning) was about to be changed in our country, performance experiments were carried out for present(R-134a) and alternative(R-1234yf) refrigerants. With increasing coolant volume flow rate in plate heat exchanger, heat rejection rate increased due to refrigerant mass flow rate increment. While heating capacity of R-134a was increased by 78%, that of R-1234yf was increased by 67.5% due to lack of enthalpy difference in high pressure side. In case of coolant temperature, heating capacity with R-134a was decreased by 46.4% from 45℃to 53. 5℃. As a result, because changing refrigerant led to decrease performance, design modification is required to improve heat capacity. Modified plate heat exchanger as a condenser will be studied and plate heat exchanger as an evaporator will be executed experimentally under vehicle operating conditions.
Song, Jaejung,Kim, Jeesu,Hwang, Sekyu,Jeon, Mansik,Jeong, Sanghwa,Kim, Chulhong,Kim, Sungjee The Royal Society of Chemistry 2016 Chemical communications Vol.52 No.53
<P>'Smart' gold nanoparticles can respond to mild acidic environments, rapidly form aggregates, and shift the absorption to red and near-infrared. They were used as a photoacoustic imaging agent responsive to the cancer microenvironment, and have demonstrated the cancer-specific accumulation at the cellular level and an amplified signal which is twice higher than the control in vivo.</P>
김상진(Sangjin Kim),김국진(Kookjin Kim),한성제(Sungje Han),전주명(Jumyoung Jeon) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
The purpose of this study is to introduce a process for EPS steering performance development reflecting customer requirements by investigating customer steering clinic outcomes. Nowadays, according to increasing customer expectations, vehicle dynamics is a major source of differentiation in the automotive market. Steering performance is a direct interface between the vehicle and the driver which influences their perception of vehicle characteristics. So, it should be recognized that steering performance is an important element of vehicle dynamics. It also is a key component of customer satisfaction, however, it is difficult to satisfy all customers simultaneously. This study focuses on establishing the process to set targets optimized for the Korean market by defining control factors related to human perception, varying these control factors in a designed experiment and tabulating evaluations by customers. Final results were investigated using statistical analysis. This study demonstrates an effective method to understand customer preferences and apply them to steering performance target setting.
A rapid and facile method for measuring corrosion rates using dynamic light scattering
Joo, Jinmyoung,Seo, Hyejung,Chun, Changho,Han, Kunwoo,Jung, Hwangyo,Kim, Sungjee,Jeon, Sangmin The Royal Society of Chemistry 2012 The Analyst Vol.137 No.3
<P>A dynamic light scattering (DLS) method was adopted for measuring the corrosion of iron nanoparticles. The average diameter of the nanoparticles in a sodium chloride suspension increased linearly with time as iron oxide layers formed around the nanoparticles. The nanoparticle corrosion rate determined by DLS was found to be almost identical to the value obtained by conventional immersion tests (ASTM G31). The DLS method offers the advantage that measurements may be completed within several hours under natural corrosion conditions whereas the conventional immersion method requires several months. Application of the DLS method to alloy nanoparticles with a variety of chromium compositions showed that the nanoparticle sizes changed nonlinearly over time, and the curves were best fit by a first order exponential function. The first order time constants were found to be linearly related to the corrosion rates determined by ASTM G31.</P> <P>Graphic Abstract</P><P>The size change of metal nanoparticles was measured using dynamic light scattering to determine the corrosion rate of the nanoparticles. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2an15975a'> </P>
Jung, Sungwook,Park, Joonhyuck,Bang, Jiwon,Kim, Jae-Yeol,Kim, Cheolhee,Jeon, Yongmoon,Lee, Seung Hwan,Jin, Ho,Choi, Sukyung,Kim, Bomi,Lee, Woo Jin,Pack, Chan-Gi,Lee, Jong-Bong,Lee, Nam Ki,Kim, Sungjee American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.22
<P>Photoswitching or modulation of quantum dots (QDs) can be promising for many fields that include display, memory, and super-resolution imaging. However, such modulations have mostly relied on photomodulations of conjugated molecules in QD vicinity, which typically require high power of high energy photons at UV. We report a visible light-induced facile modulation route for QD-dye conjugates. QD crystal violets conjugates (QD-CVs) were prepared and the crystal violet (CV) molecules on QD quenched the fluorescence efficiently. The fluorescence of QD-CVs showed a single cycle of emission burst as they go through three stages of (i) initially quenched off to (ii) photoactivated on as the result of chemical change of CVs induced by photoelectrons from QD and (iii) back to photodarkened off by radical-associated reactions. Multicolor on-demand photopatterning was demonstrated using QD-CV solid films. QD-CVs were introduced into cells, and excitation with visible light yielded photomodulation from off to on and off by nearly ten fold. Individual photoluminescence dynamics of QD-CVs was investigated using fluorescence correlation spectroscopy and single QD emission analysis, which revealed temporally stochastic photoactivations and photodarkenings. Exploiting the stochastic fluorescence burst of QD-CVs, simultaneous multicolor super-resolution localizations were demonstrated.</P>