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자산관리시스템을 위한 Combined Asset Health Index 개발
고만석,권현호,이진호,전상동,김용현 대한전기학회 2024 전기학회논문지 Vol.73 No.4
Combined Asset Health Index(CAHI) is presented to justify decisions such as replacement, repair, and additional inspection to reduce risks in the asset management system. CAHI evaluates the condition of assets using its purchase, installation, operation, visual inspection, off-line diagnosis and on-line monitoring data. CAHI identifies assets that are high risk of failure or deterioration based on the result of the asset condition. CAHI calculates condition index which represents the condition of the asset(Probability of Failure), and degradation index which represents the deterioration of the asset. Additionally, strategic index is calculated by applying the practice of replacement according to their operation age. Three indices are combined into worst case and presented as CAHI. CAHI was applied to 628 operating power transformers to evaluate its effectiveness. The condition index confirmed that each condition indicator independently indicates the probability of failure. The degradation index confirmed that asset management policies can be established by assigning weights to each degradation index based on an example in which high weight assigned to the type of insulating paper and oil preservation system. However, the condition index and degradation index did not increase and showed randomly as the operation age of the transformer increased. Therefore, strategic index is presented by applying the practice of preventive replacement according to operation age.
고만석,박준열,최홍규,서범관,최영준,김태훈,신혜영,이정은 한국조명·전기설비학회 2012 한국조명·전기설비학회 학술대회논문집 Vol.2012 No.10
전기화재 발생 시 전력설비가 직간접으로 피해를 있었을 때 전력설비의 폐기 또는 재사용 여부에 대한 건전성 평가에 대한 자료 연구는 미비한 상태이다. 본 연구는 전기화재와 관련한 외부 화염에 의해 2차 피해를 당한 차단기를 대상으로 재사용 여부를 결정하기 위하여 전기적, 기계적 시험 및 검사를 통하여 열화의 정도를 정량적으로 분석한 후 건전성을 평가 할 자료를 제공하고자 한다.
폴리아세탈 / 육티탄산 칼륨 휘스커 복합재료의 제조 및 기계적 성질에 관한 연구
고만석,이완진 한국공업화학회 1998 한국공업화학회 연구논문 초록집 Vol.1994 No.1
The silane coupling agents, γ-amino-propyltriethoxy silane, were used to improve interfacial bonding between polymer and whisker in preparing for the composite. Potassium hexatitanate whisker which the surface was treated by the contents of silane coupling agent and polyacetal were melted and mixed for 30 min at 165℃, and the specimen was synthesized by injection molding. The composite which is blended with whisker of 30 wt% treated by silane coupling agent of 0.6 wt% was the maximum in mechanical properties. This means that the functional groups of silane coupling agent were enhanced wettability between polyacetal and whisker.
Interference of Union after the Use of Beta-Tricalcium Phosphate Block in High Tibial Osteotomy
고만석,정주선,정동욱 대한정형외과학회 2015 대한정형외과학회지 Vol.50 No.5
High tibial osteotomy (HTO) is a commonly used treatment for genu varum and medial compartment osteoarthritis. Recently open wedge HTO has been the preferred method due to its facilitated technique, fewer neurovascular and joint injuries, etc. In open wedge HTO materials such as autogenous, allogenous bone graft and tricalcium phosphate (TCP) are used to help with bone union and have a role in filling in the empty space. However the authors of this study report on two cases of nonunion 1 year after HTO using TCP block.
팬과 히트 싱크를 이용한 LED 전조등의 냉각성능 해석
고만석(Manseok Ko),이주한(Juhan Lee),오상준(Sangjune Oh),조현석(Hyenseok Cho),서태범(Teabeom Seo) 대한기계학회 2009 大韓機械學會論文集B Vol.33 No.12
LED has the merits of high reliability, semi-permanent life, rapid-response and its small size for use as light source of head lamp. But the dependence of its performance and life on temperature affect on its practical use. Which dependence makes problem when the LED is heated up to a higher temperature level by self-generation of heat, due to “highly integration” to get enough quantity of light. To solve this problem, effective cooling system is needed that consider conduction, convection and radiation. This study points out the limits of natural convection cooling system and propose of forced convection with heat sink. Also, it describes a correlation between heat sink area and fluid velocity using numerical analysis to optimize the cooling system.
고만석(Manseok Ko),이주한(Juhan Lee),서태범(Teabeom Seo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
LED Junction Temperature is related to it's performance and durability. Proper cooling system is needed to keep the temperature below proper operation condition, to use on LED head lamp. The present cooling system for LED head lamp is composed of heat sink and fan without consideration of fluid flow. This study point out the problem of present system by using numerical analysis and propose a method for improving the performance of cooling system, using flow guide. Therefore, the improved model shows that the junction temperature maintained under the proper operating condition.
수치모델을 이용한 자동차 헤드램프 내부의 습기발생 현상 해석 연구
고만석(Manseok Ko),정영국(Youngguk Jung),조현석(Hyunseok Cho),신예원(Yewon Shin),서태범(Taebeom Seo) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Increasing styling features for automotive headlamps speed up the focus of understanding condensation at inner surfaces. Water vapor condensation on the inside surface of the headlamp lens is an essential factor that affects secure front view and headlamp life. One of the headlamps of automobile which is one of the most popular in Korea was chosen for the present analysis. In the basis of the experimental data of automobile given by a manufacturer, boundary conditions were defined and free convection of the air inside the headlamp and radiation from the bulb to the other surfaces are considered. As a result, temperature distribution of the inside surface of the headlamp lens are approximately the same as the experimental result.