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설비 모델링 기술을 이용한 발전성능평가 시스템 구성방안 연구
이지훈,이인태,정남준,배중석,안영모,Lee, Ji-Hoon,Lee, In-tae,Jung, Nam-Joon,Bae, Jung-Seok,An, Young-Mo 한국전력공사 2018 KEPCO Journal on electric power and energy Vol.4 No.2
발전소의 성능을 효율적으로 관리 및 유지하기 위한 발전소 성능평가는 매우 중요한 절차이다. 하지만 기존의 성능평가 방식은 엑셀 기반의 수작업 방식이다 보니 준비절차가 복잡하고, 범용성이 떨어지는 문제가 있었다. 이에 본 논문에서는 기존 성능평가 시스템의 문제점을 분석하고, 설비를 효과적으로 모델링하고 누락된 물성치를 계산하며, 이를 바탕으로 자동 지표계산을 수행하는 설비 모델러를 통해 성능평가의 범용성, 효율성 및 정확성을 높이는 방법을 기술하고자 한다. Performance evaluation of a plant to efficiently manage and maintain the performance of the plant is a very important procedure. However, since the conventional performance evaluation method is an Excel-based manual method, the preparation procedure is complicated and the versatility is poor. In this paper, we analyze the problems of the existing performance evaluation system, effectively model the equipment, calculate the missing physical properties, and improve the versatility, efficiency and accuracy of the performance evaluation through the equipment modeler which performs automatic index calculation based on this.
이지훈,오동진,김명현,Lee, Ji-Hoon,Oh, Dong-Jin,Kim, Myung-Hyun 대한용접접합학회 2013 대한용접·접합학회지 Vol.31 No.6
The large-scale structures have the possibility that there are defects such as cracks due to stress concentration caused by geometric discontinuities in the structure. In this respect, the assessment of fatigue life and the development of structural health monitoring(SHM) are very important. Fatigue design of structure is typically accomplished either using a set of stress cycle (S-N) data obtained from fatigue tests or using the fracture mechanics approach. The stress intensity factor(SIF) is required for the estimation of fatigue crack propagation life from the linear elastic fracture mechanics (LEFM) perspective. In this study, Macro Fiber Composie(MFC) sensor for the measurement of SIF of two dimensional cracks is used. The SIF based on the piezoelectric constitutive law and fracture mechanics are calculated. The measured values of the SIF are later used for the prediction of the crack propagation life. In this study, the measured value of the SIF and the fatigue life are compared with the theoretical results.
이지훈,박재범,박단비,허증수,임정옥,Lee, Jihoon,Park, Jaebum,Park, Danbi,Huh, Jeung Soo,Lim, Jeong Ok 한국재료학회 2021 한국재료학회지 Vol.31 No.7
Graphene, a new material with various advantageous properties, has been actively used in various fields in recent years. Applications of graphene oxide are increasing in combination with other materials due to the different properties of graphene oxide, depending on the number of single and multiple layers of graphene. In this study, single-layer graphene oxide and multi-layer graphene oxide are spray coated on polystyrene, and the physicochemical properties of the coated surfaces are characterized using SEM, Raman spectroscopy, AFM, UV-Vis spectrophotometry, and contact angle measurements. In single-layer graphene oxide, particles of 20 ㎛ are observed, whereas a 2D peak is less often observed, and the difference in surface height increases according to the amount of graphene oxide. Adhesion increases with an increase in graphene oxide up to 0.375 mg, but decreases at 0.75 mg. In multi-layer graphene oxide, particles of 5 ㎛ are observed, as well as a 2D peak. According to the amount of graphene oxide, the height difference of the surface increases and the adhesive strength decreases. Both materials are hydrophilic, but single-layer graphene oxide has a hydrophilicity higher than that of multi-layer graphene oxide. We believe that multi-layer graphene oxide and single-layer graphene oxide can be implemented based on the characteristics that make them suitable for application.
이지훈,김광남,Lee, Ji-Hoon,Kim, Kwang-Nam 대한치과보철학회 1985 대한치과보철학회지 Vol.23 No.1
This study was designed to investigate the side shift of orbiting condylar movement by direct measurements from tracings of Denar pantograph. It is well known that side shift has much influence on the articulating surface of teeth. In this study, after locating the ture hinge axis point with Denar hinge axis locatior, the recordings of Mandibular movement were obtained from Denar pantographic recording assembly, and immediate side shift and progressive side shift were measured. For this study, 20 dental studnts who have no missing teeth and no difficulties of mandibular movement and 4 patients who were, treated by occlusal therapy were selected. The results obtained were as follows, 1. The prevalence of immediate side shift was 42%, and the immediate side shift of greater than 0.5mm was only 17%. 2. The mean of immediate side shift (20 of 48) was 0.38mm, that of right lateral excursion (7 of 24) was 0.27mm, and that of left lateral excursion (13 of 24) was 0.44mm. 3. The mean of progressive side shift was $7.21^{\circ}$ that of right lateral excursion was $6.46^{\circ}$, and that of left lateral excursion was $7.96^{\circ}$.
이지훈,주석준,조지성,김홍진,Lee, Jee-Hoon,Joo, Seok-Jun,Jo, Ji-Seong,Kim, Hong-Jin 대한건축학회 2011 대한건축학회논문집 Vol.27 No.3
Increasing height of tall buildings often requires supplementary damping system such as tuned mass damper (TMD) for occupant comfort in wind condition. Since the guide rail type TMD has advantages of smaller space requirement and bidirectional controllability, it is often preferred in Korea to the pendulum type TMD. For the guide rail type TMD, it is important to reduce the friction force between a moving mass and guide rails. In this paper, laminated rubber bearing is used to reduce the friction force in the guide rail type TMD. This rubber bearing also provide an additional stiffness and thereby the number of required spring can be reduced significantly. The performance of TMD is tested in factory as well as in site. It was found that the use of laminated rubber bearing reduced the friction force dramatically while the control performance target was met.