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Aminoalkyl-bis-phosphonic acid 유도체의 연소특성
진의(Jin, Ui), 정의형(Jeong, Ui-Hyeong), 안성준(An, Seong-Jun), 오정규(O, Jeong-Gyu), 정영진(Jeong, Yeong-Jin) 한국화재소방학회 2013 한국화재소방학회 학술대회 논문집 Vol.2013 No.춘계
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
새로운 알킬렌디아미노알킬-비스-포스포닉산 유도체인 3종을 합성하고, 그들의 연소특성을 측정하였다. 알킬렌디아민 및 알데히드에 아인산을 첨가하여 한 단계로 반응시켜 91.3~97.3%의 수득률을 얻었다. 연소특성은 육송에 화합물을 도포한 후 콘칼로리미터(ISO 5660-1)를 이용하여 측정하였다. Heat flux는 25kW로 고정하였다. 시험결과 착화시간은 육송에 비해 51s~83s 정도 지연되었으며 착화시간이 지연 될수록 최대 열방출율이 증가하는 경향을 나타내었다.
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Ui-Joon,Park,강관구,이형주,Chan,Ho,Jeong,박진영,이성혁 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3
The present study aims to numerically investigate the thermal characteristics of the drilling probe for glacier-ice exploration with consideration of close-contact heat transfer between the electro-thermal probe and the ice. The commercial program of Ansys Fluent (v.17.2) was used, and the enthalpy porosity method was adopted for simulating the phase change heat transfer. The dynamic layering method was also used to move the computational mesh with a given speed for understanding the correlation between the moving speed and the thermal characteristics. It is found that the thin liquid layer increases with the heating power imposed on the probe, and the molten liquid radially moves in the thin liquid layer, which is much thinner than the probe size. Also, the growth rate depends on the heating power, especially in the early stage of drilling. Moreover, the probe velocity significantly affects the evolution of the thin liquid layer.
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Optimal operation of the integrated district heating system with multiple regional branches
Ui,Sik,Kim,여영구,Tae,Chang,Park,Lae-Hyun,Kim 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
This paper presents an optimal management model for structural and operational optimization of an integrated district heating system (DHS) with multiple regional branches. A DHS consists of energy suppliers and consumers,district heating pipelines and heat storage facilities in a region. The integrated DHS considered in this paper consists of 11 regional DHS branches. In the optimal management system, production and consumption of heat, transport and storage of heat at each regional DHS are taken into account. The optimal management system is formulated as a mixed integer linear programming (MILP), where the objective is to minimize the overall cost or to maximize the profits of the integrated DHS by generating electricity while satisfying the operation constraints of heat units and networks, as well as fulfilling heating demands from consumers. Evaluation of the operation cost is based on daily operations for two months (during August and December) at each DHS located in Seoul and Gyeonggi-do in Korea. Results of numerical simulations show the increase of energy efficiency due to the introduction of the present optimal operation system.
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P178 : Human papillomavirus infection signs in genital epidermal cysts: a preliminary study
( Ui Hyeon Jo ), ( Ye Eun Kim ), ( Hyunsun Park ), ( Soyun Cho ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Human papillomavirus(HPV) is associated with some cases of palmoplantar epidermal cysts and suggested to the cyst formation. Recently, a case of HPV-associated epidermal cyst in the genitalia was also reported. Objectives: To evaluate and compare HPV infection sign of the plantar and genital epidermal cysts. Methods: We retrospectively reviewed plantar and genital epidermal cyst cases. We evaluated their histopathologic characteristics and HPV positivity using immunohistochemistry. Results: Sixty cases (20 plantar, 40 genital) were included in this study. Parakeratotic nuclei within keratinous substances were present in 17 of 20 plantar cysts versus 9 of 40 genital cysts (P<0.001). Vacuolar structures in keratinous mass were seen in 7 of 20 plantar versus 6 of 40 genital cysts (P=0.076). Intracytoplasmic eosinophilic bodies in cells of cyst wall were present in 8 of 20 plantar versus 2 of 40 genital cysts (P=0.001). Six of 20 (30%) plantar epidermal cysts had all of the aforementioned histopathologic findings and demonstrated HPV positivity, whereas no genital epidermal cyst did. Conclusion: Histopathologic signs indicative of HPV infection were rarely seen in genital epidermal cysts, compared to plantar epidermal cysts. HPV is unlikely to have a general pathogenic role in the genital epidermal cyst.
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Ui mok Choi(崔義睦) 건국대학교 경제경영연구소 1983 商經硏究 Vol.8 No.1
'스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.
Idea generation is essential to the Success of a New product or product differentiation. Successful products are unlikely to emerge without good ideas. However, firms with a major interest in product innovation or diversification can not rely on informal and spontaneous ideas or informations. Though sophiscated methodologies have developed to generate ideas, they have some defects; this technique aims to reduce the time and efforts in generating and evaluating tentative ideas. The validity of the existing approaches (brainstorming synectics, and other group methods) has been questioned in a number of experimental studies. The findings indicate that individuals working alone are more effective in generating more and better creative solutions than groups. This article presents such a tool that permits the effective mass production of ideas.
