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임원종(Won-Jong Lim),정의진(Ui-Jin Jung),정성범(Seong-Beom Jeong),이재준(Jae-Jun Lee),박경진(Gyung-Jin Park) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Recently, the container ships become fairly large so that the shipping capability is more than 10,000TED. Accordingly, very large ports are required and building such ports is extremely expensive. For this reason the mobile harbor concept has been proposed. The mobile harbor, which is located in a shallow sea, can replace a port that has insufficient infrastructure. Also, this system can alleviate congestion in the ports. The mobile harbor is a small container ship which has a container crane on it. The mobile harbor is a new innovative concept for moving containers from containership to a mobile harbor or vice versa. One of the most important basic technologies is the design of a crane structure for the mobile harbor. The crane for the mobile harbor is different from the conventional cranes on the ground. Stability is guaranteed on the ground, but is not so in the sea. This study examines structural optimization of the crane structure on the mobile harbor. The position of the boom of the crane is optimized as well. The design process considers the rolling and pitching conditions of the sea state and the wind force regulations from Korean Register of Shipping. Optimization problems are formulated to minimize the weight while various design conditions are satisfied, and the formulated problems are solved by a commercial software system called GENESIS.
빛의 조사 기간에 따른 세 가지 미세조류의 지질 함량 변화와 균체의 당화 전환율 비교
임수빈 ( Su Bin Lim ),정지원 ( Ji Won Jeong ),연재성 ( Jae Sung Yeon ),이나경 ( Na Kyung Lee ),원종인 ( Jong In Won ) 한국화학공학회 2015 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.53 No.4
본 연구에서는 빛의 조사기간을 변화시켜 세 종류의 미세조류(Nanochloris, Dunaliella tertiolecta, Tetraselmis)를 배양하고 이들의 성장속도 및 지질 함량을 분석하였다. 빛의 조사기간은 한국의 여름철과 겨울철의 일조시간을 반영해 각각 14.5시간과 7시간으로 설정하였다. 또한, 지질 추출 후 남은 미세조류를 당화시켜 포도당 전환율을 비교함으로써 미세조류의 바이오매스로써의 가능성을 가늠하고자 하였다. 실험 결과 D. tertiolecta가 다른 두 종의 미세조류보다 빛의 조사기간이 7시간일 때 최대 38% 높은 성장속도를 나타냈으며 지질함량은 최대 43.6% 정도 높은 결과를 보였다. 포도당으로의 당화 전환율도 D. tertiolecta가 최대 22% 높은 결과를 보였다. Microalgae have the advantages of being able to utilize the solar energy and culturing at a low cost. In particular, microalgae have a great potential in the production of biodiesel due to the high lipid content. Lipids produced from microalgae are converted to fatty acid methyl ester (FAME) by trans-esterification reaction and FAME is called a biodiesel in general. In addition, microalgae can also be utilized as a substrate for ethanol fermentation after saccharification reaction. In this study, three types of microalgae (Nanochloris, Dunaliella tertiolecta, Tetraselmis) were cultured and their lipid contents were compared. In addition, the effects of lighting period on the growth rate and lipid content were studied. Finally, the amounts of glucose produced from each saccharified microalgae were investigated. As a result, we demonstrated that D. tertiolecta has 43.6% higher lipid content and 22% higher glucose conversion than two others.
수중 콘크리트 구조물을 위한 광물질 혼화제를 첨가한 수중불분리성 콘크리트의 특성
원종필 ( Won Jong-pil ),임경하 ( Lim Kyung-ha ),박찬기 ( Park Chan-gi ),김완영 ( Kim Wan Yong ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.6
Recently the use of the antiwashout underwater concrete with the antiwashout admixture is increased considerably. Antiwashout underwater concrete is quite different in concept from conventional underwater concrete. By mixing an antiwashout admixture with concrete, the viscosity of the concrete is increased and its resistance to segregation under the washing action of water is enhanced. The aim of this research is to evaluate the fundamental characteristics and permeability of antiwashout underwater concrete with fly ash and blast-furnace slag. Test Results of antiwashout underwater concrete with fly ash and blast-furnace slag fluence can provide its excellent fundamental characteristics and resistance of permeability.
통계적 분석에 의한 수중불분리성콘크리트 배합인자의 특성
원종필 ( Won Jong Pil ),임경하 ( Lim Kyung Ha ),박찬기 ( Park Chan Gi ) 한국농공학회 2001 韓國農工學會誌 : 전원과 자원 Vol.43 No.3
Recently the use of the antiwashout underwater concrete with the antiwashout admixture is increased considerably. Antiwashout underwater concrete is quite different in concept from conventional underwater concrete. By mixing an antiwashout admixture with concrete, the viscosity of the concrete is increased and its resistance to segregation under the washing action of water is enhanced. The aims of this research is statistically evaluated to mix proportion factor of antiwashout underwater concrete. Experiment was performed to analyze the influence variables(cement, water, and antiwashout admixture) on fundamental characteristics of antiwashout underwater concrete. The influence variables can be considered for use in a wide range of underwater work where their have statistically significant effect on the characteristics(fluidity, filling ability, resistance to washout, etc.) of antiwashout underwater concrete.
이재준,임원종,정성범,정의진,박경진,Lee, Jae-Jun,Lim, Won-Jong,Jeong, Seong-Beom,Jung, Ui-Jin,Park, Gyung-Jin 한국전산구조공학회 2012 한국전산구조공학회논문집 Vol.25 No.1
모바일하버는 선박의 대형화로 인하여 항만에 접안 및 정박이 불가능하거나 선박의 접안 대기시간이 길어지는 경우 등 항만의 문제점들을 해결하기 위해 제시된 새로운 개념의 시스템이다. 이 새로운 시스템은 해상에 있는 선박에 다가간 후, 모바일하버에 설치된 크레인을 이용하여 선박에 컨테이너를 직접 상, 하역작업을 하도록 고안되었다. 모바일하버용 크레인은 컨테이너를 이송하는 장치로써 그 중요성이 매우 크다. 본 연구에서는 모바일하버용 크레인의 형태들을 제시하고 각 형태에 따른 구조최적설계를 실시하였다. 불안정한 해상으로부터 발생되는 횡동요 및 종동요와 바람에 의한 풍하중을 최적설계의 하중조건으로 하였다. 또 한국선급 및 각각의 규정들을 최적설계의 제한조건으로 하여 규정을 만족하면서 경량화된 크레인 구조를 최적화하였다. The mobile harbor is a new concept system to solve the problems of a port. These problems are that container ships cannot be anchored at the dock because they have become larger or the waiting times of anchoring the ships are increased due to heavy container traffic. A new system is designed to carry out the loading and unloading of containers between the mobile harbor and the container ship using the mobile harbor crane at sea. The crane plays an important role when transferring the containers. In this research, various types of the mobile harbor crane are proposed and structural optimization for each type of the crane is carried out. The loading conditions consider the rolling and pitching conditions of the unstable sea state and the wind force are considered. The constraints are mainly the regulations made by the Korean Register of Shipping. The structure of the crane is optimized to minimize the mass while various constraints are satisfied.
PAN계 탄소섬유의 제조 및 탄화 조건에 따른 특성 분석
이현재,원종성,임성찬,이태상,윤준영,이승구,Lee, Hyun Jae,Won, Jong Sung,Lim, Sung Chan,Lee, Tae Sang,Yoon, Jun Young,Lee, Seung Goo 한국섬유공학회 2016 한국섬유공학회지 Vol.53 No.2
In this study, PAN (polyacrylonitrile)-based carbon fiber was prepared under different carbonization conditions. Carbonization of oxi-PAN fiber was performed under four different temperature conditions. Changes in the characteristics of these carbon fibers prepared under each condition were studied using various analyses. Crystalline characteristics of carbon fiber such as crystallinity and crystal size were analyzed using X-ray diffraction (XRD) and Scherrer's equation, based on the XRD patterns, respectively. The tensile strength and modulus of these carbon fibers were measured through a tensile test. Thermal characteristics were analyzed using a thermogravimetric analyzer (TGA). The result showed that the crystal size and crystallinity of the carbon fibers increased with carbonization temperature. Furthermore, both mechanical strength and thermal resistance were also observed to improve with carbonization temperature. Finally, a relationship between carbonization temperature, thermal properties, and mechanical properties of the carbon fibers was derived.
전기방사에 의한 PVDF/PU 복합나노섬유의 제조 및 특성 분석
이현재,홍태민,임성찬,원종성,이승구,Lee, Hyun Jae,Hong, Tae Min,Lim, Sung Chan,Won, Jong Sung,Lee, Seung Goo 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.2
Bicomponent nanofibers with piezoelectric and latent-crimp properties were fabricated from two polymer solutions of polyvinylidene fluoride (PVDF) and polyurethane (PU) by electrospinning. Experimental conditions for electrospinning, such as applied voltage, solution concentration, and flow rate, were investigated to determine the optimal conditions for fabricating the bicomponent nanofibers. As a result, 21 wt% solution concentration, 0.5 ml/h flow rate, and 15 kV applied voltage were identified as optimum conditions for electrospinning the bicomponent nanofibers. The morphologies of the side-byside structure of the PVDF/PU fibers were observed. The formation of ${\beta}$-phase crystals by electrospinning was confirmed by Fourier transform infrared spectroscopy (FT-IR) and differential scanning calorimetry (DSC). Additionally, it was confirmed that the applied voltage does not have a significant effect on the formation of ${\beta}$-phase crystals. After the hydrothermal treatment, the ${\beta}$-phase crystalline content in the bicomponent fibers remained unchanged.
장성옥(Chang, Sung Ok),원종순(Won, Jong Soon),박진희(Park, Jin Hee),이혜순(Lee, Hea Shoon),박형숙(Park, Hyoung Sook),임선영(Lim, Sun Young),송미령(Song, Mi Ryeong),백훈정(Paik, Hoon Jung),김경희(Kim, Kyung Hee),송경애(Sohng, Kyeon 기본간호학회 2014 기본간호학회지 Vol.21 No.4
Purpose: Purpose: This study was undertaken to develop directions for research on nursing practice education and also for standardization of contents of Fundamental Nursing Practice (FNP) by identifying and analyzing the present content and inconsistency in FNP textbooks. Method: Eleven FNP textbooks published between 2007 and 2013 were selected and itemized nursing contents were compared and analyzed. Nursing professors and practicingnurses prioritized contents identified from an actual condition survey based on theoretical reason and clinical guides for each item. Results: Inconsistencies were found for 34 domains with 219 sub items and of them, 21 domains and 84 items needed to be standardized. Number of items that showed consistency between professors and nurses (ICC ≥ .800) was 29 (34.5%) and for complete consistency (ICC=1), 4 (4.8%). Number of items that showed inconsistency between the groups (ICC< .600) was 30 (35.7%) and very low consistency (ICC=0), 10 (11.9%). Conclusion: The results indicate a difference between understood validity of content by professors and by nurses and technical differences among FNP textbooks. Therefore confirmation of the items needing to be standardized and differences in understanding content by professors and by nurses shows a need for standardization of practice education between course and clinical practice. These results provide basic data for developing standardized form of FNP education.
CoCrFeMnNi 고엔트로피합금 주조재의 미세조직 및 기계적 특성
강민주 ( Minju Kang ),원종우 ( Jong Woo Won ),임가람 ( Ka Ram Lim ),박상협 ( Sang Hyeop Park ),서성문 ( Seong Moon Seo ),나영상 ( Young Sang Na ) 대한금속ㆍ재료학회 2017 대한금속·재료학회지 Vol.55 No.10
In this study, we made large-scale ingots of CoCrFeMnNi high entropy alloy by vacuum induction melting. The as-cast CoCrFeMnNi high entropy alloy contained a high proportion of columnar structures with a few equiaxed grains, and showed single phase fcc solid solutions without macro segregation and low interstitial levels. The tensile properties along the three different loading directions were investigated at low-temperature and room temperature. A decrease in temperature led to an increase in yield and tensile strengths. The increase in anisotropy due to the columnar structure was negligible. Unlike wrought CoCrFeMnNi high entropy alloys, twins were actively formed in the specimen deformed at room temperature. Mechanical twinning was found to be a result of the coarse grain size, over 500 μm, of the as-cast CoCrFeMnNi high entropy alloy, which effectively reduced the critical stress for twinning. Charpy impact tests were also conducted, and the absorbed energy of the CoCrFeMnNi high entropy alloy showed no dependence on the temperature or loading directions. The results of this study provide an understanding of pilot-scale high entropy alloy castings, and are expected to be utilized as basic properties for manufacturing large-scale high entropy alloy castings, which are effective in severe environments. (Received May 23, 2017; Accepted June 4, 2017)