http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
사각(四角) 충돌수분류(衝突水噴流)의 열전달증진(熱傳達增進)에 관(關)한 연구(硏究)
박성연,이종수,엄기호,서정민,Park, S.Y.,Lee, J.S.,Ohm, K.C.,Seo, J.Y. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.1
The purpose of this study is an augmentation of heat transfer in the case of upward rectangular impinging water jet system. The variables of this study are nozzle-to-heated surface distance, jet velocity and supplementary water height. Optimum heights of supplementary water which augment the heat transfer rate are S/B=2 for H/B=30 and S/B=I for H/B=40, 50. On the Y-direction of nozzle, there exhibits the secondary peak of heat transfer coefficient when supplementary water is not used, however using the supplementary water, it does not exhibits. In the case of using supplementary water, heat transfer coefficient increases not only in stagnation region but also in wall jet region.
복잡 치아종의 외과적 적출후 미맹출치의 자발적 맹출 유도
박성연,남동우,김현정,김영진,남순현,Park, Sung-Youn,Nam, Dong-Woo,Kim, Hyun-Jung,Kim, Young-Jin,Nam, Soon-Hyeun 대한소아치과학회 2003 大韓小兒齒科學會誌 Vol.30 No.3
Odontomas are the common type of odontogenic tumors and generally they are asymptomatic, depending upon size, location and their limited growth potential. they are rarely diagnosed before the second decade of life, and the frequently lead to impaction or delayed eruption of permanent teeth. Odontomas are classified of compound as compound or complex by morphology. Complex odontomas are unorganized masses of odontogenic tissues, morphologically not resembling the teeth, account for approximately 25 percent of all odontomas, 22 percent of odontogenic tumor of the jaws, and have a predilection for the posterior mandible in males. The etiology of odontomas is unknown, although local trauma, infection, and genetic factors have been suggested. Usually, treatment of odontoma is conservative sugical removal and their is little probability of recurrence. This paper describes two cases of complex odontomas diagnosed in children due to impaction of maxillary first molar in all cases, the surgical excision of the lesions was performed. Follow-up after 2 years, showed spontaneous eruption of the first permanent molar to the occlusal plane. 치아종은 치성 종양 중 가장 흔한 형태로 대체로 병소의 크기나 위치에 따라 증상이 없는 경우가 대부분이며 성장이 제한적이다. 보통 10대 이전에 주로 진단되며 종종 영구치의 매복이나 맹출 지연을 유발한다. 형태에 따라 복합 치아종과 복잡 치아종으로 구별된다. 복잡 치아종은 치성 조직이 조직화되지 않은 덩어리로 형태학적으로 정상 치아 형태를 닳지 않으며 전체 치아종의 약 25%, 악골내 발생하는 치성 종양의 약 22%를 차지하고 남성에서 하악 구치부에 호발한다. 치아종의 원인은 아직 밝혀져 있지 않으나, 아마도 해당 부위의 국소적인 외상, 감염, 유전적 원인이 관여 할 것이라 추측된다. 치아종의 치료는 대부분 보존적인 외과적 적출술이 추천되며 재발은 거의 없다. 본 증례는 상악 제 1대구치의 매복을 일으킨 복잡 치아종으로 진단된 두 어린이에게서 병소의 외과적 적출술 및 개창술을 시행하고 관찰한 결과 약 2년후 제 1 대구치가 자발적으로 맹출함을 보여 이에 보고하는 바이다.
라우릴황산나트륨과의 Roll 혼합에 의한 메페남산의 용출성 개선
박성연,서성훈,Park, Seong-Yeon,Seo, Seong-Hoon 한국약제학회 1992 Journal of Pharmaceutical Investigation Vol.22 No.4
Dissolution rate of practically insoluble mefenamic acid was improved by roll mixing with sodium lauryl sulfate (SLS) or polyvinylpyrrolidone (PVP). The dissolution rate of the drug roll mixtures with SLS was superior to that of roll mixtures with PVP. The maximal dissolution rate was found in the roll mixtures system with SLS content of 60%. The dissolution rate of mefenamic acid roll mixtures with SLS content of 60% reached to the maximum value after 10 min of roll mixing. The transport of roll mixtures with SLS across rat jejunum was studied by the perfusion method using everted rat jejunum in vitro. The absorption rate of roll mixtures was superior to that of mefanamic acid.
Mobility Design Proposal for Children’s Safety on Road
Soo Jin Kim(김수진),Wooyeong Park(박우영),Jeongyun Heo(허정윤),Sungyeon Park(박성연) 대한인간공학회 2021 대한인간공학회 학술대회논문집 Vol.2021 No.11
Objective: We believe the scope of smart mobility can be extended beyond the means of transportation or a delivery tool. This study proposes a mobility design for the safety of child pedestrians. Background: Children are at high risk of pedestrian crash Injuries. According to the Traffic Accident Analysis System (TAAS), 483 school zone traffic accident cases were reported in 2020, and 87% involved pedestrians. Children have low situational awareness of their surroundings due to the low eye level and they have the tendency to be easily distracted. As a result, an oncoming vehicle might not be perceived as a threat to child pedestrians. Even with much effort by the government, the number of school zone accidents has not decreased in the past few years. Therefore, we would like to propose a smart mobility system resembling the Green Mothers’ Society of Korea (similar to Junior Police Officers), providing safety instructions to children and to keep an eye on the vehicles in school zones. Method: Our design process was based on the Double Diamond model. [Discover]: The risk factors derived from direct observation of two school zones in the areas of Greater Seoul are (a) children’s lack of situational awareness; (b) the negligence of drivers; (c) the blind spots created by illegally parked vehicles; (d) the traffic violations of delivery motorcycle riders. [Define]: When members of the Green Mothers’ Society are on duty, the roadways in school zones become much safer since the traffic gets controlled and actions taken immediately against the physical threats. [Develop]: Key elements in solving the problems are (a) device functioning as a barricade to restrict the vehicles; (b) pedestrian escort functions in highrisk places such as crossings; c) the ability to promptly report illegal parking; and d) the HMI function. [Deliver]: We propose ‘SIST’, which is a conceptual smart mobility system designed to improve the safety of children on school zone roadways. Results: SIST is made up of a fleet of ‘Kidobots,’ a guiding robot, and the ‘Mothership,’ where the Kidobots dock. Two or more SIST units drive autonomously towards each of their mission locations once the system is activated. When they arrive at the allocated locations, each of the Mothership disembarks four Kidobots. Then, the Motherships start to serve their duty as the barricade to control the traffic. Meanwhile, the Kidobots goes to the mission areas and serves as a guide for children and their safety. The Kidobots have several functions. They gently get in the way of oncoming cars to inform the driver the presence of the children at crosswalks or intersections where visibility is not secured. They also notify children to pay attention to the roads. Speakers and projectors will be used for communications. In addition, the built-in cameras will allow the Kidobots to take pictures of illegally parked cars and report it to the city. Conclusion: We proposed a smart mobility system that can enhance the safety of the child pedestrians in the school zone. It can be effectively used to protect children on their commuting routes. Application: Through this study, we were able to present a new area of public design that includes mobility. When the mobility we proposed is activated, it will be expanded to services related to autonomous vehicles and predictive using collected data. It is expected that the service can be expanded as well.
LNG 선의 1차 방벽 주름부의 내압 성능 분석을 위한 잔류 응력 및 기하학적 형상에 관한 연구
박성연(Seong Yeon Park),김성수(Seong Su Kim) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
The primary barrier of a liquefied natural gas (LNG) carrier generally has a corrugated shape, so as to withstand thermal shrinkage at cryogenic temperatures. Studies have been performed to improve the performance of the primary barrier through structural analysis. However, when analyzing the pressure-resisting capability of the corrugation, previous studies have not considered the residual stress generated during the forming process of the corrugation. In this work, the pressure-resisting capabilities of the corrugation were evaluated by considering the residual stress generated during the forming process of the corrugation and buckling mode considered through a linear buckle analysis using finite element analysis. Universal hydraulic test equipment was developed for measuring the pressure-resisting capabilities of corrugations of various sizes. By comparing the analytical results from the experiments, it was confirmed that the pressure-resisting capability of the corrugation decreased by 16% when the residual stress and initial buckling mode were considered simultaneously.