• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.567-570
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• 2006

A numerical study has been carried out for a solar water heater which consists of double skin solar vacuum tubes. Water is heated as it flows through the coaxial fluid conduit inserted in each tube. The space between the exterior of the fluid conduit and the glass tube is tilled with antifreeze solution. This is to facilitate heat transfer from the solar heated absorber surface to water and to prevent the functional problems due to freezing in frigid weather conditions. A one-dimensional steady state model is fully described which will be used to develop three-dimensional model using STAR-CD. These models could be used efficiently in designing double skin solar collector tubes with different geometrical parameters other than those considered in the present analysis. Results show a good agreement when compared with other experimental data demonstrating the reliability of the one-dimensional model employed.

• Journal of the Korean Solar Energy Society
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• v.24 no.3
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• pp.27-38
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• 2004

A numerical investigation has been carried out for a solar system, which consists of all glass solar vacuum tubes Water is heated as it flows through the coaxial fluid conduit inserted in each tube. The space between the exterior of the fluid conduit and the glass tube is filled with antifreeze solution. This is to facilitate heat transfer from the solar heated absorber surface to water and to prevent the functional problems due to freezing in frigid weather conditions. A one-dimensional steady state model is fully described which will be used to develop three-dimensional model using STAR-CD. These models could be used efficiently in designing all-glass solar collector tubes with different geometrical parameters other than those considered in the present analysis. Results show good agreement when compared with other experimental data demonstrating the reliability of the present model.

• Journal of the Korea Institute of Military Science and Technology
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• v.5 no.3
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• pp.89-97
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• 2002

In this study, the effect of $\alpha$-phase morphology on the dynamic deformation behavior at ultra high strain rate was investigated by EBW(Explosive Bridge Wire) test. All of tests and analyses were conducted on three typical microstructures of Ti-6Al-4V alloy, i.e. equiaxed, widmanstatten and bimodal microstructures. The spall strength and HEL(Hugoniot Elastic Limit) of the specimens that have the thickness of 2mm and 4mm were highest with the bimodal microstructure. These results were similar with previous study which was performed by dynamic torsion test(Kolsky torsion test).

• Journal of Korean Medical classics
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• v.19 no.4
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• pp.27-61
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• 2006

수당오대적대근의학발전유소적정책(隨唐五代적代근의學발展有소的政策), 기구(기구), 제도등축점완비료(制度等逐漸完비了). 저시기유정부발전의학교육적정책치득의정적공적(저時期由政府발展의學교育的政策値得의政的功적). 정규의학교육적방면상몰치전과의(定規의學교育的方面上몰置전科의), 안배교육과정(安排교育과程), 임용고시등구비구비료의학교적규모(任用考시等具비具비了의學교的規模), 영외발전료지방의학교육화의학보급(영外발展了地方의學보育和의學普及). 방포의방화지방요로상다착처방적조시백성의료제공방변(방布의方和地方要路上다着처方的조百姓의료提供方便), 야영향료의학화신적보급(也影향了의學和신的普及). 저시기의정상최현저적성과시제고본초학적지위적(저時期의政上最현著的成果是提高本草學的地位的). 태의서내설치료의학교육동시설치료전문약학교육(太의署內設置了의學교育同時설置了전문葯學교育). 이차정부이편수본초학적병반포전국위최초적약전(而且政府以編수本草學籍幷반布全국위最初的葯典). 저시기유정부법제화료의약관리방면적야시대대수획(저時期由政府法制化了의葯管理方面的也是大大收획). 수당이전몰형성의약관리화유소제도(隨唐以前沒形成의葯管理和有소制度), 규모(規模). 의생근거일정적법률근환자관계병엄가구관자기(의生根据一定的法律근患者관系幷엄可拘管自己). 수당오대의정흔다방면상탁유성효(隨唐五代의政흔多方面上卓有成效), 단시궁정의약기구적규모흔방대(但是宮廷의葯기구的規模흔방大), 인원과잉(人員과剩), 역궁정의관수공제(亦宮廷의官受控制), 불능발휘자기적능력(不能발揮自己的能力). 야불능발전위백성적의약기구(也不能발展위百姓的의葯기구). 인위정부불태중시의학(因위政府不太重시의學), 소이의생적지위잉시불고(所以의生的地位仍是不高). 나취시저시기의정적결점(那就是저시期의政的缺点).