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플라이애시 다량치환 콘크리트의 미분시멘트 치환율 변화에 따른 초기강도 향상 효과
유장원(Yoo, Jang-Won),류금성(Ryu, Gum-Sung),고경택(Koh, Kyung-Taek),한민철(Han, Min-Cheol),한천구(Han, Cheon-Goo) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
The purpose of the study was to examine all engineering characteristics followed by change of fine particle cement substitution rate to improve initial strength of concretesubstituting Fly Ash in quantity. The results were as follows. Above all, in the event of fluidity, the standard mixture was more largely increased than Plain mixture (OPC), but was reduced according to fine particle cement substitution rate was increased. Compressive strength had an excellent effect on improving initial strength of concrete substituting Fly Ash in quantity by revealing 60~80 % strength of Plain mixtureaccording to change of fine particle cement substitution rate in comparison with 30~60 % of Plain mixture in the event of the standard mixture. Especially, the compressive strength was the best when fine particle cement was 15 %, considering economic efficiency, constructability and late strength enhancement.
플라이애시 다량치환 콘크리트의 미분시멘트 치환율 변화에 따른 초기강도 향상 효과
유장원 ( Yoo Jang-won ),류금성 ( Ryu Gum-sung ),고경택 ( Koh Kyung-taek ),한민철 ( Han Min-cheol ),한천구 ( Han Cheon-goo ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
The purpose of the study was to examine all engineering characteristics followed by change of fine particle cement substitution rate to improve initial strength of concretesubstituting Fly Ash in quantity. The results were as follows. Above all, in the event of fluidity, the standard mixture was more largely increased than Plain mixture (OPC), but was reduced according to fine particle cement substitution rate was increased. Compressive strength had an excellent effect on improving initial strength of concrete substituting Fly Ash in quantity by revealing 60~80 % strength of Plain mixtureaccording to change of fine particle cement substitution rate in comparison with 30-60 % of Plain mixture in the event of the standard mixture. Especially, the compressive strength was the best when fine particle cement was 15 %, considering economic efficiency, constructability and late strength enhancement.
고출력 슁글드 태양광 모듈의 온도 저감에 따른 출력 특성 분석
배재성,유장원,지홍섭,이재형,Bae, Jae Sung,Yoo, Jang Won,Jee, Hong Sub,Lee, Jae Hyeong 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.6
An increase in the temperature of photovoltaic (PV) modules causes reduced power output and shorter lifetime. Because of these characteristics, demands for the heat dissipation of PV modules are increasing. In this study, we attached a heat dissipation sheet to the back sheet of a shingled PV module and observed the temperature changes. The PV shingled module was tested under Standard Test Conditions (STCs; irradiance: 1,000 W/㎡, temperature: 25℃, air mass: 1.5) using a solar radiation tester, wherein the temperature of the PV module was measured by irradiating light for a certain duration. As a result, the temperature of the PV module with the heat dissipation sheet decreased by 3℃ compared to that without a heat dissipation sheet. This indicated that the power loss was caused by a temperature increase of the PV module. In addition, it was confirmed that the primary parameter contributing to the reduced PV module output power was the open circuit voltage (Voc).
노요한,유장원,이재형 한국태양광발전학회 2022 Current Photovoltaic Research Vol.10 No.4
For the high efficiency of the photovoltaic module, a high-output solar cell, which is the basis of photovoltaic power generation, is required. As the light receiving area of the solar cell increases, the light receiving area of the photovoltaic module also increases. Accordingly, recent trend is to use large-area solar cells such as M6 and M8 instead of M2-based solar cells for manufacturing the photovoltaic module and a study on the mechanical stiffness of the module with increased size is required. In this study, a mechanical load test corresponding to IEC-61215 was performed among the reliability tests of large-area photovoltaic modules. In order to confirm the degree to which the mechanical load test affects the photovoltaic module, the output and EL images were checked by sequentially increasing the pressure by 600 Pa at a pressure of 2400 Pa. Also, factors such as output and efficiency of large-area photovoltaic modules were verified through mechanical load testing of actual large-area photovoltaic modules and the rate of change was very small at 1%.
환자-의사 간 원격의료 제도 도입에 대한 법적 사회적 적합성 고찰
문종윤 ( Moon Jongyoon ),유병인 ( Yoo Byungin ),박관준 ( Park Kwanjun ),최종윤 ( Choi Jongyoon ),장원기 ( Jhang Wongi ),박윤형 ( Park Yoonhyung ) 한국의료법학회 2013 한국의료법학회지 Vol.21 No.2
정보통신기술의 발달에 따라 선진국에서는 원격의료의 범위를 확대하는 것을 검토하고 있다. 우리나라도 의사의 대면진료원칙에 추가하여 의사-환자 간 원격의료를 허용하는 방안을 추진하고 있다. 최근 원격의료가 새로운 진료의 방법이 아니라 진료의 보조적 수단이기 때문에 현재의 의료법도 허용되어 있다는 대법원 결정이 공고되어 법 개정의 실효성에 대하여 검토가 필요하다. 의사 환자 간 직접 원격의료를 하기 위해서는 처방전을 전송하는 방안, 원격의료에 따른 진료내용 보존방안 등 세부적인 사항이 먼저 마련되어야 한다. 처방전은 개인의료정보와 관련되어 철저한 보호가 필요하다. 그러나 처방전의 안전한 발급과 보존에 대한 방안이 마련되지 않아 법적 안정성이 미흡하다. 원격의료는 만성질환자가 혈압과 혈당 등을 스스로 측정한 내용을 의사와 원격으로 상의하여 처방을 받는 데 활용하는 것이 가장 유용한 방법이다. 자가 관리 생체정보를 의료에 이용하는데 따른 어플리케이션도 의료기기상의 허가 대상인지 명확히 해야 한다. 이에 대해 미국 FDA는 지침을 발표했고 한국 식품의약품안전처는 질의에 답변하는 형태로 별도허가가 필요하다고 답변하였다. 원격의료가 의료시장에서 대면진료와 같이 활성화될 수 있는지에 대하여 전문가 들은 대면진료의 보조수단으로 시장에 영향은 미미할 것으로 전망하고 있다. 원격의료를 허용함으로써 도서 지역 등 의료취약지역과 노인층 등 의료취약계층에 의료접근성의 문제를 해결한다고 하나 원격의료가 스마트 폰 등 첨단기기와 어플리케이션을 사용하는 방식인데 반해 취약지와 취약계층은 첨단기기에 접근과 사용이 어려워 접근성이 향상되기는 어려울 것으로 보고 있다 그동안의 취약지 의료기반 확충정책은 취약지에 의사를 배치하는 정책이었는데 원격의료가 이를 해결한다고 보기는 어렵다. 원격의료는 정부가 기대하는 산업발전에도 기여가 미약 할 것으로 보고 있다. 이 정책에 대하여 정책관계자의 의견은 상반되고 있다. 보건의료계는 적극반대하고 있는 반면 IT산업계와 경제부처(기획재정부, 산업통상자원부)는 필수적이라고 하고 있다. 결론적으로 지금 제도 도입으로 원격의료를 시행하는 것은 적합하지 않으며 또한 불가능할 것으로 보인다. 앞으로 기본계획과 세부실천방안을 마련하고 사회적 합의를 거쳐 시행해야 할 과제이다. As information and communication technology(IT) develops, each country is reviewing legal and institutional expansion of telemedicine. It is also expected to allow the physician-patient telemedicine service in Korea by adding the principle of face to face medical service to its Health care Law. But because telemedicine is not a new medical treatment but a complementary measure of treatment in hospital, it is necessary to have a precedent that shows the allowance of the present medical law and a careful review of the law. To conduct a direct telemedicine between doctor and patient, details such as ways to issue a prescription remotely and preservation of medical record in telemedicine system should be arranged in advance. A thorough protection is needed for the prescription as it is related to private medical information. But the related system is still far from perfect due to the lay in arranging and presenting the measures for safe issue and preservation of the prescription. The most practical use of telemedicine system at present is to get a prescription from a doctor after a remote consulting on the contents of self-care, self hypertension measuring, and self-blood sugar measuring of a patient with non communicable disease. It should also clarified whether the application for using self-managing biomedical information in the treatment is approved as a medical instrument or not. Regarding this matter, the U.S. FDA has announced a guideline and Korea Food & Drug Administration is giving answers to related questions. With respect to the possibility of invigorating telemedicine system in the medical market, experts say it would not give much influence on the market as it is just a complementary measure of the original medical treatment. The medical community and experts are skeptical about allowing the telemedicine system despite the fact that it is expected to resolve the problem of accessibility among underserved areas such as islands and population such as the elderly and lead to the development of the medical market and also the general industry. They say it will hardly improve the accessibility for underserved areas and population because of difficult access to high-tech gadgets and application such as smart phones, which is required to be used in telemedicine system. They also expect only the slightest contribution to the development of industry expected by the government because the telemedicine system as a complementary measure of treatment is not expected to give a significant change to the medical market. The opinions of stakeholder regarding this policy are greatly varied. While physician, healthcare-related NGO, and KMA are actively opposing to this policy, IT industry and the government financial departments (Ministry of Strategy and Finance, Ministry of Trade, Industry & Energy) say the policy is indispensable. In conclusion, it presently appears to be inappropriate and impossible to conduct telemedicine system through the law revision. It should be carried out based on the social agreement.