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Un-Ki Han,Jong-Min Kim,Sun-Bae Bang,Han-Sang Kim,Hyeong-Jun Choi 한국조명·전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.9
The occurrence of a corona is that electrical discharge due to the heterogeneity that occurs when an electrical field is concentrated in an electrode due to a cusp formed on said electrode. Wire treatment at the end of a 154[㎸] dead end clamp for end users accelerates the occurrence of corona, which in tum leads to power loss and noise. In this study, the characteristics of the corona which occurs between porcelain insulators and support clamps of overhead lines used in 154[㎸] power receiving facilities for end users were investigated. The corona, which cannot be identified by one common method, was measured utilizing a IN image carrera A risk assessment for fire damage and its status was suggested. The stress distribution of the electrical field by length of bare wire was suggested by means of the finite element method (FEMLAB). As a result, it was found to affect a porcelain insulators. These results can be utilized for the enhancement of clamp installation and safety in power facilities.
Un-Ki Han,Jong-Min Kim,Sun-Bae Bang,Han-Sang Kim,Hyeong-Jun Choi 한국조명.전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.9
The occurrence of a corona is that electrical discharge due to the heterogeneity that occurs when an electrical field is concentrated in an electrode due to a cusp formed on said electrode. Wire treatment at the end of a 154[kV] dead end clamp for end users accelerates the occurrence of corona, which in turn leads to power loss and noise. In this study, the characteristics of the corona which occurs between porcelain insulators and support clamps of overhead lines used in 154[kV] power receiving facilities for end users were investigated. The corona, which cannot be identified by one common method, was measured utilizing a UV image camera. A risk assessment for fire damage and its status was suggested. The stress distribution of the electrical field by length of bare wire was suggested by means of the finite element method (FEMLAB). As a result, it was found to affect a porcelain insulators. These results can be utilized for the enhancement of clamp installation and safety in power facilities.
Sweetpotato Variety 'Hopungmi' for Edible and Food Processing Use with Multiple-Disease Resistance
Hyeong-Un Lee,Mi-Nam Chung,Gyeong-Dan Yu,Tae-Hwa Kim,Yeon-Sang Song,Su-Jung Kim,Jae-Myung Kim,Jin-Young Moon,Young-Sik Kang,Kyu-Hwan Choi,Sang-Sik Nam,Koan Sik Woo,Won Park,Kyo Hwui Lee 한국육종학회 2023 한국육종학회 공동학술발표집 Vol.2023 No.-
Hyeong-Un Yeo,Young-Bae Chung 한국산업경영시스템학회 2014 한국산업경영시스템학회 학술대회 Vol.2014 No.춘계
The purpose of this study is to present the Market Orientation effects on Enterprise Management Performance. In order to carry out this research, we obtained 212 survey sheets and inspected ten assumptions based on the reliability, validity of the questionnaires. The results of regression analysis are summarized as follows; First, the factor of Market Orientation, intelligence generation, don’t influence on the Enterprise Management Performance significantly. Second, the element of Market Orientation, information dissemination, don’t have an important effect on the Enterprise Management Performance. Finally, the requisite of Market Orientation, information response, affects to Enterprise Management Performance significantly. Based on the results, the parts with intelligence generation and information dissemination will be improved in the manufacturer of the small businesses.
Han, Un-Ki,Kim, Jong-Min,Bang, Sun-Bae,Kim, Han-Sang,Choi, Hyeong-Jun The Korean Institute of IIIuminating and Electrica 2007 조명·전기설비학회논문지 Vol.21 No.9
The occurrence of a corona is that electrical discharge due to the heterogeneity that occurs when an electrical field is concentrated in an electrode due to a cusp formed on said electrode. Wire treatment at the end of a 154[kV] dead end clamp for end users accelerates the occurrence of corona, which in turn leads to power loss and noise. In this study, the characteristics of the corona which occurs between porcelain insulators and support clamps of overhead lines used in 154[kV] power receiving facilities for end users were investigated. The corona, which cannot be identified by one common method, was measured utilizing a UV image camera. A risk assessment for fire damage and its status was suggested. The stress distribution of the electrical field by length of bare wire was suggested by means of the finite element method(FEMLAB). As a result, it was found to affect a porcelain insulators. These results can be utilized for the enhancement of clamp installation and safety in power facilities.
Park, Un Chul,Park, Ki Ho,Kim, Dong Myung,Yu, Hyeong Gon Lippincott Williams Wilkins, Inc. 2011 Journal of glaucoma Vol.20 No.7
PURPOSE: To evaluate the safety and efficacy of Ahmed Glaucoma Valve implantation (AGVI) for the management of neovascular glaucoma (NVG) associated with proliferative diabetic retinopathy (PDR) in the vitrectomized eyes. PATIENTS AND METHODS: We reviewed the medical records of patients with NVG associated with PDR who underwent AGVI for intraocular pressure (IOP) control and compared the surgical outcome according to vitrectomy history. The main outcome measures were: postoperative IOP control, visual acuity, and complications. Success was defined as an IOP of ≤21 mm Hg and ≥6 mm Hg, without further glaucoma surgery or loss of light perception and devastating complications. RESULTS: A total of 73 patients (73 eyes) were included: 42 patients with vitrectomy history before AGVI (vitrectomized group) and 31 patients without vitrectomy history (nonvitrectomized group). The cumulative probabilities of success after AGVI were 89.9% and 83.8% after 1 year, 74.8% and 74.7% after 2 years, and 62.5% and 68.5% after 3 years for the vitrectomized group and the nonvitrectomized group, respectively (P=0.9309). Cox proportional hazards regression showed the intraocular silicone oil tamponade as a risk factor for the surgical failure (odds ratio=4.543, P=0.047). Final visual acuity improved or stabilized in 33 patients (78.6%) in the vitrectomized group and 18 patients (58.1%) in the nonvitrectomized group. Complications were comparable between the groups, but surgical interventions were needed for 5 patients (11.9%) in the vitrectomized group. CONCLUSION: Despite some complications that necessitate surgical intervention, the AGVI is a safe and effective procedure that enables successful IOP control and vision preservation in patients with NVG associated with vitrectomy for the PDR.