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허광태(Kwang-Tae Hur),박후명(Hoo-Myung Park),곽재섭(Jae-Seob Kwak),하만경(Man-Kyung Ha),하경호(Kyoung-Ho Ha) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
Recently, polyurethane pre-polymer has been used widely in the social life. In this paper, evaluation of parameters for polymerization process was carried out using design of experiments. As a result, the effect of each parameter affected by viscosity and residual NCO of pre-polymer was found. Optimization of polymerization process was performed. and the these results were applied to produce casting tape having a better performance.
허광태(Kwang-Tae Hur),하만경(Man-Kyung Ha),이용철(Yong-Chul Lee) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
The cemented carbide alloy is used in many fields, such as cutting tool and mold. In this study, the ultra-precision machine carried out nano-grinding for cemented carbide surface. The grinding machine was super-precision machine with air bearing spindle. During the grinding process, #600 diamond wheel was used first for rough grinding and then, #2000 diamond wheel for fine grinding. The result of surface roughness was 5.371nm in this study, which was better than usual mold surface roughness.
허광태(Kwang-Tae Hur),하만경(Man-Kyung Ha) 한국기계가공학회 2008 한국기계가공학회 춘추계학술대회 논문집 Vol.2008 No.-
This study about pre-polymerization for production of casting tape has been carried out to find good chemical composition. But, actually, different applied to pre-polymerization. So, it is necessary to perform the optimization of parameters for pre-polymerization. So, this study carried out the total of twenty-seven experiment to check the influence of the all factors. Such as water temperature of heating polymerization furnace, working time in the peak of condition, impeller rotating speed, impeller shape. And then, the result showed that impeller shape have heavily affected the NCO, and also water temperature have fairly affected the residual NCO. moreover, the prepolymer experiment took total reaction to maintain over one hear according to water and thermometry experiment of pre-polymer checked value.
허광태(Kwang-Tae Hur),하만경(Man-Kyung Ha),곽재섭(Jae-Seob Kwak),이용철(Yong-Chul Lee) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
It is absolutely necessary to achieve precision manufacturing technology of lenses because their usage for camera, medical instruments, optical parts and so on is gradually increasing. This study focused on the assessment of grinding process of the mold core for spheric lenses. For the experiments, a nano-turning machine was adopted and a used material for the mold core was a tungsten carbide including the cobalt composition of below the 0.5%. According to preplanned experimental process, a diamond grinding wheel was trued and dressed by a GC wheel, and then the mold cores were ground as R30. The form accuracy and the surface roughness of the mold core after grinding process were measured.
이진,하광태,조경덕,Lee Jin,Ha Kwang-Tae,Zoh Kyung-Duk 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.2
The objectives of this study were to investigate the formation of trihalomethanes(THMs) and to compare the concentration level of THMs of swimming pools water by different disinfection methods such as chlorine, ozone-chlorine, and salt brine electrolysis generator (SBEG). The concentration of chloroform was the highest in the chlorine system, and the SBEG was the highest in the production of bromodichloromethane (BDCM), dibromochloromethane (DBCM) and bromoform. The average concentration of total trihalomethanes (TTHMs) in three disinfection systems were $64.5{\pm}27.4mg/l(SBEG),\;43.8{\pm}22.3mg/l(chlorine)$, and $30.6{\pm}16.1mg/l(ozone-chlorine)$, respectively. In chlorine and ozone-chlorine disinfection system, chloroform concentration was highest, followed by BDCN, then DBCM. In the SBEG, TTHMs was composed of 42% of chloroform, 28.9% of bromoform, 15.1% of BDCM and 14% of DBCM, respectively. The strongest correlation was obtained in the levels of chloroform and TTHMs in chlorine, and ozone-chlorine disinfection systems from both indoor and outdoor swimming pools ($r=0.989{\sim}0.999$, p<0.01). In the SBEG, the levels of BDCM and TTHMs showed a good correlation (r=0.913, p<0.01). In chlorine and ozone-chlorine disinfection systems at indoor swimming pools, pH, TOC and $KMnO_4$ consumption showed strong correlation with chloroform and TTHMs concentrations (p<0.01). In the SBEG, pH and TOC were also strongly correlated with chloroform (p<0.01). pH and TTHMs were correlated as well (p<0.05).
김창규(Chang-Kyu Kim),하광태(Kwang-Tae Ha),강미혜(Mi-Hyae Kang),정숙녀(Sook-Nye Chung),김지성(Ji-Sung Kim),김가연(Ga-Yeon Kim),정종흡(Jong-Heub Chung),어수미(Soo-Mi Eo),정권(Kweon-Jung) 대한환경공학회 2018 대한환경공학회지 Vol.40 No.7
본 연구의 목적은 석면 비산방지제의 성능을 평가하는 장치기술을 개발하여 현행 공정시험방법을 효율적으로 개선하고자 하였다. KS의 석면 비산방지제 시험방법(KS M 2757:2014)중 섬유비산 시험방법의 공기분사방식과 공기분사구의 압력조절방식을 개선하여 시험의 정확성을 증대시켰다. 공기분사방식을 1-way에서 2-way로 적용한 결과, 측정된 석면 평균농도는 0.051 f-PCM/㏄로서 기존의 1-way방식(0.012 f-PCM/㏄)보다 약 4배 높아 석면 검출능력이 향상되었다. 또한 공기분사구 압력조절방식 개선을 위해 표면압력측정부를 적용한 결과, 시험체 표면에 항상 일정한 풍속 약 10 ㎧를 유지하였다. 그러나 표면압력측정부가 없는 경우에는 구동모터의 이격거리 변화 때문에 풍속이 변화하여 각각 6.6, 4.8, 3.7 ㎧로 일정하지 못하였다. 그러므로 2-way공기분사방식을 통해 시험체에 충분한 유량을 사각지대 없이 공급하여 석면 검출능력을 높이고, 표면압력 측정기능을 통해 시험체에 일정한 풍속을 유지시킴으로써 시험방법의 정확성과 효율성을 개선하였다. The purpose of this study is to develop a device to evaluate the performance of asbestos stabilizers and improve the accuracy of the process test method. We increased the accuracy of the test method by applying the air injection method and pressure control method of the nozzle in the testing methods for performance evaluation of encapsulants in asbestos-containing building materials (KS M 2757:2014). As a result of applying the air injection method, the average concentration of asbestos obtained using the 2-way method was 0.051 f-PCM/㏄, which is approximately four times higher than that obtained using the 1-way method (0.012 f-PCM/㏄). In addition, as a result of applying the pressure control method, a constant air velocity of approximately 10 ㎧ was maintained at the air injection port to the specimen by using the surface pressure sensor. In the absence of the surface pressure measuring part, the air velocity was changed to 6.6, 4.8, and 3.7 ㎧ respectively, owing to the change of the travel distance of the turning motor. Therefore, the accuracy and efficiency of the test method were improved by supplying 2-way air injection to the specimen without blind spots and maintaining a constant air through the surface pressure sensing function.
MW 풍력발전기 블레이드 와류생성기 공력 특성에 관한 연구
문현기(Hyeon-Gi Moon),정재호(Jae-Ho Jeong),하광태(Kwang-Tae Ha),김정기(Jeong-Gi Kim),박선호(Sunho Park) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.12
Aerodynamic characteristics of vortex generator(VG) on MW wind turbine blade has been investigated with numerical simulation. VG is widely adopted on the blade root region which is dominated by secondary flow separation. Separated flow on the blade suction surface were captured by the Reynolds-averaged Navier-Stokes(RANS) analysis method using general-purpose code, Ansys CFX. The simulation shows that the aerodynamic performance of wind turbine blade is remarkably dominated by VG structure. This VG strongly generates a pair of longitudinal vortices in the blade trailing edge direction, and prevents the large scale of secondary flow separation. A parameter study of the VG design has been conducted using the most effective design parameters of VG shape. VG is considered to have a significant role on the aerodynamic performance of wind turbine blades even though it has small size and low cost.
QGIS를 활용한 서울시 소유 석면건축물 분포지도 제작에 관한 연구
이진효(Jin Hyo Lee),배일상(Il Sang Bae),하광태(Kwang Tae Ha),유승성(Seung Sung You),한규문(Kyu Mun Han),어수미(Soo Mi Eo),정권(Kweon Jung),이진숙(Jin Sook Lee),구자용(Ja Yong Koo) 대한환경공학회 2016 대한환경공학회지 Vol.38 No.9
효율적인 석면건축물 유지관리를 위한 방법 중의 하나는 다양한 주제의 석면지도 제작 및 분석을 통해 우선제거대상건물을 선정하는 것이다. 따라서 본 연구에서는 효율적인 서울시 소유의 석면건축물 관리를 위해 QGIS(Quantum Geographic Information System)를 활용하여 다양한 주제의 석면지도를 제작하였다. 석면환경 노출 및 공기 중 비산문제를 유발시킬 가능성이 높은 석면건축물을 선정하기 위해서 석면건축물 밀집도, 석면면적비율, 인구분포를 고려한 석면건축물 분포도, 우선제거대상 존재유무, 위해성 등급 및 석면건축물 경과년수 등을 종합적으로 고려하여 우선제거대상 석면건축물을 선정하였다. 본 연구와 같이 GIS 등을 활용함으로써 석면건축물 분포현황뿐만 아니라 우선제거대상 건물을 선정하는데 방법의 하나로서 활용될 수 있을 것이다. 향후에는 석면건축물 주변의 생활환경 특성을 고려한 속성값 분류의 다양화 등 보다 정확한 산정기준을 마련할 필요가 있으며, 이를 통해 석면노출에 따른 취약지구 관리에 활용될 수 있을 것으로 기대한다. One of ways for effectively maintaining asbestos buildings is to select asbestos buildings to be removed firstly by manufacturing and analyzing asbestos map of various topics. Thus, in this study we manufactured asbestos map of various topics for the effective management of asbestos buildings owned by Seoul using QGIS (Quantum Geographic Information System). To select asbestos buildings likely to cause asbestos scattering problem and exposure into the air, we comprehensively took into consideration various topics such as asbestos buildings density, asbestos-area ratio, asbestos buildings distribution considering the population, first removal object, risk assessment, elapsed year. As described in this study, using the GIS may be utilized as a method for selecting asbestos buildings to be removed firstly as well as distribution of asbestos buildings. In the future, it is necessary to make assessment criteria considering diversification of property value in GIS such as the characteristics of the living environment around the asbestos buildings. This is expected to be utilized to manage the vulnerable region to asbestos exposure.