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가정용 가스보일러 곡관 배기통의 길이 변화에 따른 CO농도 고찰
임사환(Leem Sa-Hwan),허용정(Huh, Yong-Jeong),마성준(Ma, Sung-Jun) 한국산학기술학회 2007 한국산학기술학회논문지 Vol.8 No.5
21C 산업의 발전과 더불어 급증하고 있는 가스산업은 사용의 편리성과 위험성을 공존하고 있다. 특히 근대 산업혁명 이후 에너지 및 환경에 대한 문제가 두각을 나타내게 되었다. 따라서 환경친화적인 에너지원으로서 가스의 수요가 날로 급증하고 있다. 가스의 수요와 더불어 가스보일러의 설치 및 사용이 늘어나면서 보일러 폐가스(CO)에 의한 인명피해가 해마다 증가하고 있다. 따라서 본 논문의 목적은 보일러 곡관 배기통의 길이에 따른 CO농도의 고찰을 통하여 인체에 대한 위해성을 파악코자 함이다. CO의 허용농도인 50ppm에 해당하는 길이는 3곡관 1m에서 3분이 경과할 경우이다 또한,5m에서는 5분 경과부터 CO농도가 허용농도를 초과하는 것으로 나타났다. 특이하게 2m부터 4m까지는 CO농도가 허용농도 이하였다. As the industry of 21C has been developed, the gas industry has grown and it has not only the convenience but also the riskiness for using. Especially, the energy and environment problems have been getting serious after the modem industry revolution. Therefore, the demand of gas as an eco-friendly energy source is getting increased. With the demand of gas, the installation and use of gas boiler is also increased, so human life injury by the waste gas(CO) of boiler goes on increasing every year. Therefore, we want to find out the harm to human body through the study on the concentration of eo by the length of the curved exhaust tube of boiler. The allowable concentration of CO is 50ppm. The length of the one-meter-three-curved tube after three minutes is applicable to 50ppm of the threshold limit values of CO. Also, five meters exceed the threshold limit values of CO after five minutes. Strangely, the concentration of CO is under the threshold limit values from two to four meters.
크메르어, 버마어, 베트남어, 라오어 모음체계의 유형적 보편성 연구
허용 한국언어문화교육학회 2018 언어와 문화 Vol.14 No.1
This paper aims to study the universals of vowel systems of four Southeast Asian languages, namely Khmer, Burmese, Vietnamese and Lao. Two factors should be considered in discussing the universals of vowel systems of the natural languages: the size of the vowel inventory and the contents of the language in question. Three of the four languages have long vowels or nasal vowels in addition to the normal (short) vowel and these vowels should be also included in the analysis to find out the nature of vowel system universals of the nature languages. We set up three different systems for the analysis; the system of normal vowels, the primary system (S1) and secondary system (S2). The inventories of the four languages in the UPSID(UCLA Phonological Segment Inventory Database, Maddieson 1984; Maddieson & Precoda 1990) are mainly analyzed with some other phonological data from various literature, and the findings from the discussion are as follows. First. 5 vowels are most preferred in the normal vowel system and in even the system of S1 and S2. Second, long vowels can be larger than the normal vowels in their numbers. Third, nasal vowels are more common than long vowels in natural languages. Fourth, the four languages have a large number of vowels, as is well known as other languages in the same area, but both the peripheral and interior vowels are relatively well organized with respect to the size principle and dispersion principle, with the exception of the normal vowel system of Vietnamese and the S2 of Burmese.
허용,김병열,이홍섭,김주이,이정호,유회성,Hur, Y.,Kim, B.Y.,Lee, H.S.,Kim, J.E.,Lee, J.H.,Yu, H.S. 대한흉부심장혈관외과학회 1980 Journal of Chest Surgery (J Chest Surg) Vol.13 No.1
We present one case of 26-year-old male having saddle block combined with mitral valvular disease [NYHA Class IV] with auricular fibrillation. The most common cause of emboli is atrial fibrillation. The clinical manifestations of saddle emboli are relatively slow due to development of collateral circulation and large size of lumen of the aorta. The 5month duration of saddle emboli in this case led to severe atrophic changes, coldness, peripheral cyanosis on the both lower extremities, and flexion deformity on the knee and ankle joint of the left lower extremity. We planned staged operation for the saddle block and for mitral stenoinsufficiency and tricuspid insufficiency, because of poor general condition of the patient. The thromboembolectomy of aortic bifurcation was performed through the transabdominal approach without trial of Fogarthy catheter embolectomy, because of expectation of the secondary inflammatory changes of the vessel wall and thrombi which was 3 cm X 1 cm X 0.5 cm in size with irregular surfaced solid in consistency. 1 month later, after thromboembolectomy, mitral valve replacement and tricuspid annuloplasty were performed, with successful early operative result. During operation organized thrombi [1 cm X 0.5 cm] in the left auricle was removed. We wonder if simple management using Fogarthy catheter might be possible to remove the thromboemboli instead of thromboembolectomy by aortotomy in this case.
허용,문준호,안욱수,김병일,이정호,유희성,Hur, Y.,Moon, J.H.,Ahn, W.S.,Kim, B.Y.,Lee, J.H.,Yu, H.S. 대한흉부심장혈관외과학회 1992 Journal of Chest Surgery (J Chest Surg) Vol.25 No.8
The omental pedicle flap[OFF] has been used for management of complicated problems in various fields of cardiovascular surgery. Its unique properties of enhancing neovascularity, relieving lymphedema, providing fibroblasts to promote healing, providing soft tissue coverage, & functioning in the face of existing infection make it ideal in managing many of the more complicated problems facing the thoracic surgeon. We have used omental pedicle for colosing of the bronchial fistula R esophageal fistula with filling the adjoining cavity after pneumonectomy. The successful closure of the bronchial stump with OFF were obtained in 2 cases, but one case was failed who was suffered from the esophageal fistula. The primary operation in each cases were right pleuropneumonctomy for tuberculous empyema in 2 cases & left pneumonectomy for chronic empyema in 1 case, We believe that the OFF is effective for closing fistula due to postoperative empyema k plombage procedures for dead space of infected thoracic cavity.