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산업단지 및 일반생활 지역의 공기 중 톨루엔에 대한 개인노출 및 생체시료의 상관성 분석
이병준(Byoungjun Lee),허 정(Jung Heo),정다영(Dayoung Jung),김순신(Sunshin Kim),류현수(Hyeon-Su Ryu),최민지(Min-Ji Choi),솨이지엔페이(Jian-Fei Shuai),임성국(Sung-Guk Im),양원호(Wonho Yang) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.4
Objectives: The purpose of this study was to assess the correlation relationship between personal exposure and urinary hippuric acid in biological monitoring for airborne toluene in an industrial complex and in general environments. Methods: Personal exposure to toluene and its metabolite, hippuric acid, in urine were simultaneously measured in occupational environments area near an industrial complex and in general environments. The study subjects were divided into three types: 137 workers who use organic solvents in the workplace, 210 residents living near a dyeing industrial complex, and 379 residents living in general environments. The toluene exposures of workers and residents were measured by a passive sampler for four days. The urine of participants was sampled when the passive samplers of personal exposure were collected. Results: The toluene and hippuric acid concentrations of workers were the highest, followed by the concentrations of residents living near a dyeing industrial complex and residents living in general environments. The coefficient of correlation between the concentrations of toluene and hippuric acid among workers was 0.749 (p<0.01) in the workplace. On the contrary, correlations between the concentrations of toluene and hippuric acid among residents living near a dyeing industrial complex and residents living in general environments were all not significant. The relationship between the concentrations of hippuric acid and toluene in three types could be described by the exponential growth model. Conclusions: This study analyzed the relationships between toluene exposure and the concentrations of hippuric acid in urine in high, middle, and low exposure environments, and could be described by the exponential growth model.
Choi, Dukhyun,Choi, Min-Yeol,Choi, Won Mook,Shin, Hyeon-Jin,Park, Hyun-Kyu,Seo, Ju-Seok,Park, Jongbong,Yoon, Seon-Mi,Chae, Seung Jin,Lee, Young Hee,Kim, Sang-Woo,Choi, Jae-Young,Lee, Sang Yoon,Kim, Jo WILEY-VCH Verlag 2010 ADVANCED MATERIALS Vol.22 No.19
<B>Graphic Abstract</B> <P>The cover shows an image of fully rollable transparent nanogenerators synthesized using chemical vapor deposition grown large-scale graphene sheets as transparent electrodes and piezoelectric ZnO nanorod arrays. Sang-Woo Kim, Jae-Young Choi, and co-workers report on p. 2187 the electrical and structural stability of the nanogenerators, with excellent charge scavenging performance under external mechanical loads such as bending and rolling. This study shows that graphene-based nanogenerators are very promising for self-powered rollable transparent device applications. <img src='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content.gif' alt='wiley_img_2010/09359648-2010-22-19-ADMA201090066-content'> </P>
( Sang-hyeon Won ),( Kihyuk Shin ),( Woo-il Kim ),( Min-young Yang ),( Won-ku Lee ),( Tae-wook Kim ),( Sung-min Park ),( Hyun-joo Lee ),( Gun-wook Kim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Moon-bum K 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2
Background: Psoriasis is an chronic inflammatory disease affecting multiple aspects of patients’ lives. The long-term clinical study with large number of patients is important to elucidate the epidemiologic and clinical features of psoriasis. Objectives: To investigate the epidemiologic and clinical characteristics of psoriasis patients from the Psoriasis Clinic of Pusan National University Hospital. Methods: Clinical data were collected and analyzed from the medical records of 541 psoriasis patients, who were newly diagnosed as psoriasis at the Psoriasis Clinic of Pusan National University Hospital between 2012 and 2017. Results: The sex ratio was 1.5:1 (male 60.6%, female 39.4%). The peak age of onset was 20s. The most common morphological type was small plaque (63.6%), followed by large plaque (27.2%) and guttate (6.8%). Nail involvement and psoriatic arthritis accompanied in 20.3% and 9.6% of patients, respectively. Hypertension (14.2%), diabetes mellitus (7.2%), and dyslipidemia (5.2%) were the most frequently observed comorbidities in patients with psoriasis. The most common oral agents as initial treatment was Methotrexate (76.8%), followed by Cyclosporin (19.9%) and Acitretin (3.3%). Conclusion: This study highlighted the epidemiologic and clinical characteristics of psoriasis in Korea.
Peltier Heating-Assisted Low Temperature Plasma Ionization for Ambient Mass Spectrometry
Lee, Hyoung Jun,Oh, Ji-Seon,Heo, Sung Woo,Moon, Jeong Hee,Kim, Jeong-hoon,Park, Sung Goo,Park, Byoung Chul,Kweon, Gi Ryang,Yim, Yong-Hyeon Korean Society for Mass Spectrometry 2015 Mass spectrometry letters Vol.6 No.3
Low temperature plasma (LTP) ionization mass spectrometry (MS) is one of the widely used ambient analysis methods which allows soft-ionization and rapid analysis of samples in ambient condition with minimal or no sample preparation. One of the major advantages of LTP MS is selective analysis of low-molecular weight, volatile and low- to medium-polarity analytes in a sample. On the contrary, the selectivity for particular class of compound also implies its limitation in general analysis. One of the critical factors limiting LTP ionization efficiency is poor desorption of analytes with low volatility. In this study, a home-built LTP ionization source with Peltier heating sample stage was constructed to enhance desorption and ionization efficiencies of analytes in a sample and its performance was evaluated using standard mixture containing fatty acid ethyl esters (FAEEs). It was also used to reproduce the previous bacterial identification experiment using pattern-recognition for FAEEs. Our result indicates, however, that the bacterial differentiation from FAEE pattern recognition using LTP ionization MS still has many limitations.
Lee, Tae-Gon,Cho, Sung-Hoon,Kim, Dae-Hyeon,Hwang, Hyun-Gyu,Lee, Ku-Tak,Hong, Chang-Hyo,Hong, Youn-Woo,Chae, Keun Hwa,Choi, Ji-Won,Kim, Jeong-Seog,Nahm, Sahn Elsevier 2019 Journal of the European Ceramic Society Vol.39 No.4
<P><B>Abstract</B></P> <P>CuO-added (1-y)(Na<SUB>0.5</SUB>K<SUB>0.5</SUB>)(Nb<SUB>1-x</SUB>Sb<SUB>x</SUB>)-yCaTiO<SUB>3</SUB> ceramics with 0.0 ≤ x ≤ 0.1 and 0.04 ≤ y ≤ 0.055 were sintered at 970 °C. Various cubic-based polymorphic-phase-boundary (PPB) structures were formed: orthorhombic-tetragonal-cubic, and tetragonal-cubic PPB structures. The crystal structure of the specimens near Curie temperature is a mixture of <I>Pm3m</I> cubic and <I>P4mm</I> tetragonal structures and these ceramics showed ferroelectric properties. A schematic phase diagram of these ceramics has been suggested. The piezoelectric properties of these specimens were influenced by their crystal structure. All the specimens are expected to have good fatigue properties. In particular, the specimen with a tetragonal-cubic PPB structure (x = 0.04 and y = 0.045) has a large <I>d<SUB>33</SUB> </I> of 338 pC/N and a high strain of 0.17% at 4.5 kV/mm. This specimen has good temperature stability; a <I>d<SUB>33</SUB> </I> value of 300 pC/N and strain of approximately 0.12% were obtained at 175 °C, indicating that this specimen is a good candidate for use as a piezoelectric multilayer actuator.</P>
Large-area, Multipixel Photonic Skin Based On a Shape-memory and Responsive Cellulose Derivative
Sang-Hyeon Lee(이상현),Kahyun Sun(선가현),Minho Seong(성민호),Insol Hwang(황인솔),Minsu Kang(강민수),Jaeil Kim(김재일),Geonjun Choi(최건준),Hyejin Jang(장혜진),Seongjin Park(박성진),Hoon Eui Jeong(정훈의) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12