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Involvement of the Intradural Artery in Giant Cell Arteritis
홍연호 대한뇌졸중학회 2003 Journal of stroke Vol.5 No.1
Department of Neurology, Department of Radiology*, Seoul National University Hospital, College of Medicine, Seoul National University. Dr. Kim is now with the Center for Molecular Imaging Research, Mass. General Hospital, Harvard Medical School.Giant cell arteritis (GCA), the most common form of systemic vasculitis in adults over the age of 50, primarily involves the aorta and its proximal branches as well as the cranial branch arteries. Pathologically, GCA is known to be limited to the extradural portion of cranial arteries. Angiographic demonstration of the intradural arterial involvement in GCA has been rare in the literature. Herein, we report a patient with stroke complicating GCA who showed the involvement of basilar artery. This case serves as a piece of evidence supporting that GCA could involve intradural arteries.
학교와 가정 사이의 의사소통을 강화한 모바일 학급 홈페이지의 설계 및 구현
홍연호,전우천,Hong, Yeon-Ho,Jun, Woo-Chun 한국정보교육학회 2005 정보교육학회논문지 Vol.9 No.1
Advances in the wireless Internet have led to the rise of diverse techniques which can access information regardless of time and place. There are many research efforts to identify the various ways to use a cellular phone in our everyday life. However, it has been rarely used in the elementary school. As an attempt to apply the wireless Internet technology to the elementary school, this study is to design and implement a wireless Internet homepage where the parents would be able to have an easy access to the information any place and any time. The characteristics of the wireless Internet homepage are as follows; first, the images were reduced to the minimum and the text-oriented information is mostly used to deliver the key information, considering the small screen and relatively slow transmission rates. Second, by providing a link set up between the wireless homepage and the wired Internet homepage, users can choose the more convenient access tool. Finally, the SMS (Short Message Service) messages could be used for an immediate delivery of information.
송연호,홍정선,이철태 ( Yon Ho Song,Jung Seun Hong,Chul Tae Lee ) 한국공업화학회 1994 공업화학 Vol.5 No.6
기존의 자료로부터 얻을 수 있는 열역학적 계산에 의하면 금속 황화물을 염소가스에 의하여 금속 염화물로 얻을 수 있음을 알 수 있다. 실제로 AgS, AS₂S₃, CdS, CuS, Cu₂S, FeS, HgS, MoS₂, Ni₃S₂, PbS, Sb₂S₃, ZnS의 황화금속을 염소가스와 반응시켜 이를 열중량법에 의하여 고찰하였다. 이론적 계산이나 실험적 연구에서 황화물의 염소화 반응은 황화광물의 추출 야금 공정에 대한 좋은 대체 방법임을 알 수 있었다. Thermodynamic calculations have been made from existing literature data to show that it is reasonable to expect to recover metal chlorides from the chlorination of metal sulfides with chlorine gas. The reactions between 12 metal sulfides, such as, Ag₂S, As₂S₃, CdS, CuS, Cu₂S, FeS, HgS, MoS₂, Ni₃S₂, PbS, Sb₂S₃ and chlorine gas were investigated by means of thermogravimetric method. The theorical calculation and the experimental investigation showed that chlorination of sulfide is a better alternative process for the extraction metallurgical process of sulfide ores.
가상현실(VR) 게임 이용 시 안경과 콘택트렌즈 간의 피로도 및 몰입감 변화에 관한 연구
강현구,김연호,박유찬,홍형기 한국안광학회 2022 한국안광학회지 Vol.27 No.4
Purpose: In this study, we compared the difference in fatigue and immersion when playing a game with a virtual reality (VR) device while wearing glasses and contact lenses. Methods: The experiment was conducted on 32 people aged 19–27 years who did not have any objection to using VR. Fatigue due to wearing glasses and contact lenses was investigated using a simulator sickness questionnaire. After the experiment was conducted with the same subject wearing glasses and contact lenses, a corresponding sample analysis was performed. Results: In the fatigue analysis, all items showed higher values when wearing glasses than when wearing contact lenses, and seven out of 16 items were significant. In terms of immersion, there was a significant difference in ten out of 26 items in the questionnaire, and most of the items showed a high tendency to feel immersed while wearing contact lenses. Conclusions: It is inevitable that when people with ametropia use vision correction glasses or contact lenses to experience VR, fatigue increases and immersion decreases. In certain results, wearing contact lenses was more satisfactory than wearing glasses, but discomfort factors, such as dry and stiff eyes, sometimes occurred. 목적: 본 연구는 가상현실 기기로 게임을 할 때, 안경과 콘택트렌즈를 착용했을 때의 피로도와 몰입감의 차이를 비교해 보았다. 방법: 실험은 VR 사용에 거부감이 없는 19~27세의 32명을 대상으로 하였다. SSQ(simulator sickness questionnaire)를 사용하여 안경과 콘택트렌즈 착용으로 인한 피로도를 조사하였으며, 몰입감 설문지를 통해 두 시력 보정 용구간의 차이를 보았다. 동일한 대상으로 안경과 콘택트렌즈 착용을 통해 실험을 진행한 후 대응표본 분석을 실시하였다. 결과: 피로도 분석결과 안경 착용 시가 콘택트렌즈 착용 시 보다 모든 항목에서 큰 값들을 보였고, 16 개의 항목 중 7개의 항목이 유의함을 보였다. 몰입감에서는 설문의 26개 항목 중 10개의 항목에서 유의한 차이를 보였고 대부분 항목에서 콘택트렌즈 착용에서 몰입감이 높은 경향을 보였다. 결론: 비정시가 가상현실을 체험할 때 시력교정용 안경 또는 콘택트렌즈를 사용하면 피로도가 증가하고, 몰입감이 떨어지는 것은 불가피하다. 일부 결과 에서는 안경 착용보다는 콘택트렌즈 착용이 더 만족도가 높았지만, 눈의 건조함, 뻑뻑함과 같은 불편 요인들이 추 가로 발생할 수 있다.
Porter의 산업구조분석모형을 이용한 TFT-LCD 사업매력도 분석
이선규,이웅희,서명지,허연호,홍민정 금오공과대학교 산업기술개발연구원 2001 産業技術開發硏究 Vol.17 No.-
This study examined the key success factors and the degree of industry attractiveness in the TFT-LCD industries. The five competitive force factors include: barriers o entry, industry rivalry, threat of substitutes, supplier power and buyer power. As the result of this study, it was found that the key success factors were customer needs, high screen quality, low price, high performance, convenience and stability concerning with display device. This study provides another link in the chain of understanding of the industry attractiveness and key success factors in the TFT-LCD markets.