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김지용,임현술,정회경,이현경,강흥식 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.1
Hydrofluoric acid is one of strongest irritating, corrosive and poisonous inorganic chemicals. The most significant chronic consequence of excessive fluoride exposure is the disorder of skeletal system and connective tissue. The first stage of osteofluorosis consists of an increase in the density of flatbone such as pelvic bone and vertebral bones, with coarseness and blurring of bone trabecular. Therefore we wanted to observe the change of the bone density among workers exposed to hydrofluoric acid. Questionnairs and radiological investigations were performed for 39 hydrofluoric acid manufacturing factory worker sexposed to hydrofluoric acid. And then authors checked urinary fluoride level by fluoride ion method. The radiographs were doubly read by two radiologists for reliability. The results were as follows; 1. There was a significant difference in urinary fluoride level(p<0.01), but not in age, in tenure(p>0.05) among workers by the job title. 2. By the two radiologists, eight cases were read as bone fluorosis. The prevalence rate of bone fluorosis was 20.5%. 3. There was not a significant difference in general characteristic such as age, tenure and in muculoskeletal signs and symptoms between the fluorosis group and the normal group. 4. However, a close relationship between the occurence of the change of bone density and the degree of fluoride exposure such as burn was found. The difficulties in diagnosing fluorosis result from the questionable sensitivity of x-ray techniques and from the non-specific associated signs and symptoms. A quantitative method such as densitometry to assessosteosclerosis and bone structure alteration and a follow-up study are needed.
Kim, Jaeyun,Kim, Hoe Suk,Lee, Nohyun,Kim, Taeho,Kim, Hyoungsu,Yu, Taekyung,Song, In Chan,Moon, Woo Kyung,Hyeon, Taeghwan WILEY-VCH Verlag 2008 Angewandte Chemie. international edition Vol.47 No.44
<B>Graphic Abstract</B> <P>Magnetic, fluorescent core–shell nanoparticles consist of a single Fe<SUB>3</SUB>O<SUB>4</SUB> nanocrystal core and a dye-doped mesoporous silica shell with a poly(ethylene glycol) coating (see picture of TEM images and schematic depictions). These nanoparticles can be used as magnetic resonance and fluorescence imaging agents, and as drug delivery vehicles, thus making them novel candidates for simultaneous cancer diagnosis and therapy. <img src='wiley_img/14337851-2008-47-44-ANIE200802469-content.gif' alt='wiley_img/14337851-2008-47-44-ANIE200802469-content'> </P>
Kim, Min Hoe,Chung, Woo Taek,Lee, Mi Kyung,Lee, Jun Yeup,Ohh, Sang Jip,Lee, Jin Ha,Park, Dong Hee,Kim, Dong Jin,Lee, Hyeon Yong 한국미생물 · 생명공학회 2000 Journal of microbiology and biotechnology Vol.10 No.4
Spirulina platensis was grown in swine waste to reduce inorganic compounds and simultaneously produce feed resources. Spirulina platensis prefers nitrogenous compounds in the order: NH^+_4-N>NO_3-N>simple-N such as urea and simple amino acids. It even consumes NH^+_4-N first when urea or nitrate are present. Therefore, the content of residual NH^+_4-N in Spirulina platensis cultures can be determined by the relative extent of the following processes: (ⅰ) algal uptake and assimilation; (ⅱ) ammonia stripping; and (ⅲ) decomposition of urea to NH^+_4-N by urease-positive bacteria. The removal rates of total nitrogen and total phosphorus were estimated as an indicator of the treatment efficiency. It was found that Spirulina platensis was able to reduce 70-93% of PO^3-_4-P, 67-93% of inorganic nitrogen, 80-90% of COD, and 37-56% of organic nitrogen in various concentrations of swine waste over 12 days of batch cultivation. The removal of inorganic compounds from swine waste was mainly used for cell growth, however, the organic nitrogen removal was not related to cell growth. A maximum cell density of 1.52dry-g/l was maintained with a dilution rate of 0.21/day in continuous cultivation by adding 30% swine waste. The nitrogen and phosphorus removal rates were correlated to the dilution rates. Based on the amino acid profile, the quality of the proteins in the Spirulina platensis grown in the waste was the same as that in a clean culture.
High Frequency Shoot Regeneration from Leaf Explants of Some Chrysanthemum Cultivars
Kim, Young Hoe,Park, So Hyeon,Kim, Gyeong Hee,Jeong, Byoung Ryong The Korean Society of Plant Biotechnology 2004 Plant molecular biology and biotechnology research Vol.6 No.1
This study was conducted to examine differences in shoot regeneration among chrysanthemum cultivars. Leaf explants of chrysanthemum cultivars 'Sulhwa', 'Puma', 'Geummokseo' and 'Sulpoong' were used. Explants cultured on the medium for 2 weeks formed calli at the cut surfaces. Shoots regenerated on MS basal medium supplemented with various concentration combinations of NAA and BAP. Explants were cultured under cool-white fluorescent lamps with a light intensity of $40\mu{Mm}^{-2}$.$s^{-1}$ for 16 $hday^{-1}$, at $25^{\circ}c$ and 70-80% relative humidity. 'Geummokseo' and 'Sulpoong' were the most responsive cultivars in shoot regeneration. Most effective medium for 'Sulhwa' and 'Puma' was MS basal medium supplemented with 10.0 $\mu{M}$ NAA and 5.0 $\mu{M}$ BAP and for 'Geummokseo' MS supplemented with 10.0$\mu{M}$ NAA and 20.0$\mu{M}$ BAP. Regeneration of multiple shoots was observed on MS basal medium supplemented with 1.0$\mu{M}$ or 10.0 $\mu{M}$ NAA and 5.0$\mu{M}$ BAP. High frequency regeneration of adventitious shoots from leaf explants and efficient induction of root from these regenerated shoots were obtained.
김상진(Kim, Sang-Jin),김영달(Kim, Yeong-Dal),김용환(Kim, Yong-Hwan),황철회(Hwang, Cheol-Hoe),박건식(Park, Geon-Sik),남용태(Nam, Yong-Tae),박종복(Park, Jong-Bok),유능수(Yu, Neung-Su),김석현(Kim, Seok-Hyeon),강신유(Gang, Sin-Yu),남윤수 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.11
본 연구는 IEC 규정에 의거해 6kw급 소형풍력발전기 성능실증연구를 수행하였다. 실증연구를 수행하기 위하여 풍력발전기에 각종 센서를 설치, 측정 사이트에 모니터링 시스템을 구성하여 데이터를 수집 분석하였다.
김영훈 ( Kim Yeong Hun ),김선회 ( Kim Seon Hoe ),윤유석 ( Yun Yu Seog ),최민규 ( Choe Min Gyu ),장진영 ( Jang Jin Yeong ),김우호 ( Kim U Ho ),한호성 ( Han Ho Seong ),이건욱 ( Lee Geon Ug ),박용현 ( Park Yong Hyeon ) 대한소화기학회 2003 대한소화기학회 추계학술대회 Vol.2003 No.-
<목적> 췌장의 장액성 낭종은 벌집모양의 소낭성종괴가 전형적이지만 최근 대낭성을 비롯한 다양한 형태의 낭종이 보고되고 있다. 이에 본 연구는 췌장의 장액성 낭종을 방사선학적, 육안적 특징에 따라 형태학적으로 분류하고, 각 유형의 특징을 파악함으로써 다른 췌장의 낭종과의 감별과 함께 향후 장액성 낭종의 치료지침을 수립하고자 한다. <방법> 1992 년 1월부터 2003년 8월까지 췌장 절제술을 시행받은 환자들 중 조직학적으로 장액성 낭종으로 진단된 32명
구조방정식모형을 활용한 주차공유플랫폼 중요도-만족도 분석: 대구시를 중심으로
김성회(KIM, Sung-Hoe),이솔(LEE, Sol),안우영(AHN, Woo-Young),김경석(KIM, Gyeong-Seok),김주현(KIM, Ju-Hyeon) 대한교통학회 2021 대한교통학회지 Vol.39 No.6
주차공유란 개인 소유지나 공공시설의 유휴주차공간을 여러 사람이 이용하게 개방함으로써 이용 효율성을 높이고 도심지역의 주차문제를 획기적으로 해소할 수 있는 스마트 주차정책이다. 주차공유 활성화를 위해서는 충분한 주차공간의 확보와 더불어 편리한 이용 환경을 조성해야 한다. 이를 위해서는 주차공유플랫폼을 통해 제공되는 주차 정보에 대한 이용자 요구사항을 반영한 이용자 맞춤형 주차정보제공과 관련된 연구가 필요하다. 따라서 본 연구에서는 구조방정식모형(SEM)을 활용하여 자동차 이용자가 요구하는 주차 정보의 중요도(요인 적재량)를 분석하였으며, 구조방정식모형 분석 결과와 이용자 만족도 분석결과를 기반으로 중요도-만족도 분석(IPA)을 통해 중요도는 높으나 만족도가 낮은 이용자 맞춤형 주차 정보에 대한 우선순위를 제시하였다. 분석 결과 2사분면에 위치한 주차공유 정보로는 기본·추가· 최대 요금 수준, 주차장 규모, 주차장 요금정보, 잔여 주차면수, 환승 편의성, 환승주차장 수, 환승 교통수단의 다양성, 주차장 혼잡도 및 주차 소요시간으로 분석되었다. Parking sharing means that privately and publicly owned unused parking spaces are shared by other people, which allows parking spaces to be used more efficiently. This is an innovative smart parking policy that can mitigate parking problems in high traffic urban areas. In order to facilitate parking sharing system, a convenient user environment should be created with securing sufficient parking spaces. Also it is necessary to study on customized parking information provision that reflecting the needs of users about the parking information providing through the parking sharing platform. In this study, importance factors (loading factors) on parking information requested by drivers are analyzed first using Structural Equation Model (SEM). Then based on the results of SEM analysis and users satisfaction analysis, the priority of customized parking information that have higher importance rate but lower satisfaction rate are suggested through Importance Performance Analysis (IPA). The result shows that the parking informations plotted in the 2nd quadrant are parking fee level, parking space size, parking fee information, number of parking space availability, transfer convenience, number of transfer parking lots, parking lot congestion level and waiting time for parking.
Non-linear optical properties of PECVD nanocrystal-Si nanosecond excitation
양현훈(Yang, Hyeon-Hun),김한울(Kim, Han-Wool),김주회(Kim, Joo Hoe),김철중(Kim, Chul Joong),이창권(Lee, Chang Gwon) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
A study of the non-linear optical properties of nanocrystal-Si embedded in SiO2 has been performed by using the z-scan method in the nanosecond and femtosecond ranges. Substoichiometric SiOx films were grown by plasma-enhanced chemical-vapor deposition(PECVD) on silica substrates for Si excesses up to 24 at/%. An annealing at 1250?C for 1 hour was performed in order to precipitate nanocrystal-Si, as shown by EFTEM images. Z-scan results have shown that, by using 5-ns pulses, the non-linear process is ruled by thermal effects and only a negative contribution can be observed in the non-linear refractive index, with typical values around -10-10cm²/W. On the other hand, femtosecond excitation has revealed a pure electronic contribution to the nonlinear refractive index, obtaining values in the order of 10-12 cm2/W. Simulations of heat propagation have shown that the onset of the temperature rise is delayed more than half pulse-width respect to the starting edge of the excitation. A maximum temperature increase of {Delta}T=123.1?C has been found after 3.5ns of the laser pulse maximum. In order to minimize the thermal contribution to the z-scan transmittance and extract the electronic part, the sample response has been analyzed during the first few nanoseconds. By this method we found a reduction of 20% in the thermal effects. So that, shorter pulses have to be used obtain just pure electronic nonlinearities.
A Study on properties of a-Si:H layers by photoelectron spectroscopic
양현훈(Yang, Hyeon-Hun),김한울(Kim, Han-Wool),김주회(Kim, Joo Hoe),김철중(Kim, Chul Joong),이창권(Lee, Chang Gwon),소순열(So, Soon-Youl),박계춘(Park, Gye-Choon),이진(Lee, Jin) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
We report on a detailed study on gap-state distribution in thin amorphous silicon layers(a-Si:H) with film thickness between 5 nm and 20 nm c-Si wafers performed by UV excited photoelectron spectroscopy(UV-PES). We measured how the work function, the gap state density, the position of the Fermi-level and the Urbch-energy depend on the layer thickness and the doping level of the ultra thin a-Si:H(n) layer. It was found, that for phosphorous doping the position of the Fermi level saturates at E_F-E_V=1.47 eV. This is achieved at a gas phase concentration of 10000 ppm PH₃ in the SiH₄/H₂ mixture which was used for the PECVD deposition process. The variation of the doping level from 0 to 20000 ppm PH₃ addition results in an increase of the Urbach energy from 65 meV to 101 meV and in an increase of the gap state density at midgap(E_i-E_V=0.86eV) from 3{times}10^{18} to 2{times}1019cm^{-3}eV^{-1}.