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윤계원,황희성,김철훈,허지예,김복주,김정한 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.12
Purpose. The purpose of this study was to compare the type and frequency of prosthetic complications associated with attachment types for implant overdenture. Material and methods. In this retrospective study, 38 patients (mean age, 63.5 years) have been treated with implant overdentures from 2007 to 2014. Ten patients received a bar-clip attachment. Eleven patients had received a milled bar with Locator attachment. Seventeen patients had received a Locator attachment. The mean follow-up period was 36.9 months (range, 15-83 months). The type and frequency of prosthetic complications was recorded. The frequency was analyzed to determine the statistical difference among the 3 different attachments by using one-way ANOVA ( = .05) and Bonferroni post hoc method at a 5% level of significance. Results. The total number of prosthetic complications was higher in the bar-clip attachment (55 events) than in the milled bar with Locator attachment (39 events) and the Locator attachment (34 events). There were no statistically significant differences, and the most common prosthetic complication was the loss of retention. In the bar-clip attachment group, the average frequency of prosthetic complications was 3.0 events per prosthesis during the first year. In the milled bar with Locator attachment and Locator attachment groups, the average frequencies were 1.45 events and 2.35 events, respectively. Statistically significant differences were observed in the frequency of the complication. (p = .043) Conclusions. Compared to the bar-clip attachment, implant overdentures that use milled bars with the Locator attachment have a significantly lower incidence of prosthetic complications in the first year of follow-up after placement.
원지희 손주아 윤예리 노봉수,김호종 김계원 한국식생활문화학회 2006 韓國食生活文化學會誌 Vol.21 No.5
This study was to investigate the effect of Jubak(Sulchigegie) on the physicochemical properties of pork. A pork was cooked in a pot opening the lid with the Jubak for 20 min and then covering the lid without Jubak for 20 min at 100℃. Effect of the added amounts of Jubak on the pork was examined by principal component analysis and electronic nose consisting of six metal oxide sensors. As a pork was cooked with 30 g Jubak, ratio of resistance was increased. This condition removed unpleasant smell of pork. Effect of the pork with Jubak is better the end location than middle of pork. Also, first principal component score increased as the pork cooking time was increased. In the texture properties, hardness, chewiness, gumminess and springness of the pork with 30 g Jubak were significantly lower than others processed in this study. With sensory evaluation, the pork with 30 g Jubak obtained the best score in taste, texture and overall acceptability. It could be concluded that the pork(400 g) with 30 g Jubak reduces the pork odor, increase the tenderness and improve the flavor and taste of pork.
API 5LB鋼管의 高周波電氣抵抗熔接部에 관한 破壞靱性 評價
吳世旭(Sae-Wook Oh),尹漢基(Han-Gi Yoon),安啓元(Kye-Won Ahn) 한국해양공학회 1987 韓國海洋工學會誌 Vol.1 No.1
The evaluation of the elastic-plastic fracture toughness J1C was performed on the center of weld metal (CWM), the heat affected zone (HAZ) and the base metal (BM) of API 5LB steel pipes welded by the high frequency electric resistance welding. The J1C was evaluated by the JSME R-Curve and JSME SZW methods using the smooth and side-grooved specimens.<br/> The results are as follows;<br/> (1) The J1C values by the SZW method are overestimated as compared with those by the R-curve method. because the micro-crack is formed as SZW increase with the deformation at SZ after initiation of the ductile crack.<br/> (2) The average of J1C values by the R-curve and the SZW methods in side-grooved specimens tended to decrease in comparison with smooth specimens 9.42% at CWM, 4.2% at HAZ, 23.2% at BM, respectively.<br/> (3) The boundary of the fatigue pre-crack, stretched zone, and dimple regions appeared more clearly in side-grooved specimens, for the slight change of SZW in the direction of the plate thickness, as compared with smooth specimens.
전압인가식 제전기의 방전에 의한 가연성가스의 폭발에 관한 연구
이춘하,옥경재,김점호,권병덕,차하나,윤계원 한국화재소방학회 2004 한국화재소방학회논문지 Vol.18 No.4
The static eliminator is used for prevention of disasters by static discharge, improvement of production efficiency, protection of a sensitive electronic element on the discharge of static, and it is handled for elimination of static in the painting plant, the film manufacturing plant, the producing semi-conductor factory. This study described on the explosion appearance by discharge phenomena on the voltage input type eliminator's ion generation bar of inflammable gas through an experimental tests. It was used Hydrogen, Ethylene, Propane, Methane gas with the inflammable gas and it was studied on the ignition phenomena by the length of ion-generation static bar, the number of ion-generation electrode and the variation of input voltage to the ion-generation electrode. As a result of this study it was confirmed that the shorter of the bar's length, the greater of explosion danger. And it is considered that there will not ignite at general using inflammable gas, in case of more than 900 mm bar and one electrode. 정전기 방전에 의하여 주위의 가연성 가스에 폭발을 일으킬 수 있는 가스관련시설, 석유화학공장, 화약 공장, 필름생산공장, 반도체 공장 등과 같은 가연성 가스를 주로 취급하는 장소에서는 정전기를 제거하기 위해 제전기를 사용하고 있다. 본 연구에서는 이들 장소에서 주로 사용되고 있는 전압인가식제전기(static eliminator)의 Bar에서 발생하는 방전에 의한 가연성 가스의 폭발현상을 고찰하였다. 가연성 가스는 수소, 에틸렌, 프로판, 메탄 가스 등을 사용하였으며, 제전기의 이온발생 Bar의 길이, 이온발생 전극의 수 및 이 온발생 전극에 인가되는 전압의 변화에 따른 점화 현상을 연구하였다. 연구결과 Bar의 길이가 짧을수록 폭발의 위험성이 증가됨을 확인할 수 있었으며 또한 900 mm 이상의 Bar에서 전극의 수가 1개인 경우 일반적으로 사용하는 가연성 가스에서는 점화가 되지 않음을 알 수 있었다.