• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 추계학술대회 논문집 전기설비전문위원
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• pp.89-92
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• 2004

This paper described the capacitive sensor for the diagnosis of deterioration of electrical insulating oils applying guard-ring type the 3-terminal electrodes. To measure stable capacitance of the sensor and to determine the design factors of the sensor, we utilized computational analysis, FEM software. This capacitive sensor discern the extent of deterioration measuring relative permittivity of electrical insulating oils. The result of measuring numerous sample, mineral oils, as serviced year, we confirmed an increase in relative permittivity of oils. Moreover, we confirmed the superior characteristics of the sensor as a species, aged pattern of oils and operating temperature.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 추계학술대회 논문집 학회본부
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• pp.379-381
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• 1995

Many generating stations in korea are 25 years or more old, and are nearing the end of their planned life. Financial conditions and Site, Environment problems have made approval for construction of new stations increasingly difficult, and extending the life of an existing older plant may be a palatable alternative. Therefore, To determine whether generator rewinds are necessary to achieve an extended life, and Methods are required to estimate the proable remaining life of existing winding, here, We are going to estimate insolation condition through Nondestructive diagonostic test and Aging history tests of generator Stator winding and winding conditions through deterioration characteristics due to Heat cycle.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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• pp.489-492
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• 2003

In this paper, we experimented on the deterioration process of power supply cords and analyzed the heating temperature of each part of those cords. We also analyzed the surface states, metallurgical structures surface structures and compositions of the wire melted by over-current. In the results of the analyses, the covering began to be deteriorated from the inside. The heating temperature of extension cord was higher than that of plug body. The dendrite structures appeared at the melted wire. By the SEM and EDS analyses, the dendrite structure showed the growth of copper oxide. We found out the characteristics of PVC insulated flexible cords by over-current from the above experiments and analyses. These results may be useful data in the analyses of deterioration causes of power supply cords.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 추계학술대회 논문집
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• pp.796-799
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• 2014

It is treated more seriously than ever as the customer requirements are becoming a high-quality and diversification. Among the various elements to affect customer's evaluation of automobile quality, BSR(buzz, squeak, rattle noise) are considered to be a mostly contributing factor. Rattle Noises in cockpit modules are one of the major concerns mentioned above. Recently, measurements of the BSR noise between the parts that make up the products from the perspective that the structural causes. For structures that make up material has not been any consideration of the BSR noise characteristics. The aim of this study is to clarify the characteristics of noise occurrence in vehicle cockpit module that consist of plastic material after measuring noise by rattle special testing instrument.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1997년도 추계학술대회 논문집
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• pp.313-316
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• 1997

The effects of aromatic curing agent of MDA contents and post curing conditions on dielectric deterioration characteristics of DGEBA/MDA/SN system were investigated. The dielectric properties were measured by using needle-plane electrode geometry under the commercial AC high electric field application. As the curing agent content increased, the dielectric breakdown strength increased and then decreased slightly. All the trees initiated from the tip of needle electrode and the shape of the tree in this system was a dendrite type.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2004년도 하계학술대회 논문집 Vol.5 No.1
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• pp.449-452
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• 2004

The life of power transformer is basically dependent on the aging deterioration of insulating paper. Analysis of insulating paper for its DP value or tensile strength requires removal of a few strips of paper but direct measurement of this properties is not practical for in-service transformers. For this reason furfural analysis by HPLC has gained increasing favor as a means of estimating degradation of insulating papers in power transformers and this paper reports on the analysis of data on the concentration of furfural in oil samples from about 50 power transformers and the case study. The data showed that furfural content can estimate more accurately aging characteristics compared to concentration of CO, $CO_2$. We expect that these results can be useful to predict the aging characteristics and life diagnosis of power transformers and further the study must be continued.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2020년도 가을 학술논문 발표대회
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• pp.149-150
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• 2020

Granting self-sensing performance in a building is an important performance to ensure the degree of damage and safety of the building. Since the current research is being conducted in the state before deterioration loss occurs, it is necessary to confirm whether the self-sensing performance is maintained even in the damaged conductive cement composite. As part of the study, electrical resistance characteristics were analyzed in conductive cement composites in which freeze-thawing and chemical corrosion occurred. As a result, it was found that the change in electrical resistance value due to freeze-thawing was not as large as 1%, and chemical corrosion occurred. It was found that the change in electrical resistance value of the tested specimen increased by about 10%.

• 한국농촌계획학회:학술대회논문집
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• 한국농촌계획학회 1998년도 정기총회 및 춘계 학술논문발표회
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• pp.41-44
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• 1998

• 한국지역지리학회지
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• 제14권3호
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• pp.224-238
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• 2008

전통적인 도시내부 산업단지는 최근 산업구조의 고도화와 도시공간구조의 변화 등으로 인해 침체와 노후화 과정을 겪고 있다. 사례지역인 제3산업단지의 경우도 업체 규모와 생산액의 영세화, 주요업종의 변화, 필지의 세분화, 지가 변화 등에서 노후화의 특성을 보인다. 따라서 대구시는 단지의 노후화에 대한 대응책으로 향후 도심형 첨단산업단지로의 정비를 추진하고 있다. 반면 직접적인 노후화를 겪고 있는 업체들은 단지 재정비 계획에 대해 인지하지도 못한 채 침체와 노후화에 대한 뚜렷한 대책을 마련하지 못하고 있다. 따라서 대구시가 계획하고 있는 재정비 방안은 입주업체와 충분한 협의과정을 거쳐야 할 것이며, 향후 입주업체와 대구시의 입장을 매개해 줄 수 있는 핵심주체가 필요할 것이다.

• 보존과학연구
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• 통권28호
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• pp.21-37
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• 2007

Paper cultural asset show various deterioration characteristics and behaviors according to the environmental conditions during the storage. The understanding of the paper itself and its conservation knowledge is thus prerequisite to preserve paper cultural assets and pass them to descendants in a good condition. The Annals of Joseon Dynasty is one of the most important our written cultural assets (National treasure No.151) and it is registered as a UNESCO Memory of the World. The Annals of Joseon Dynasty is composed of 1707 volumes and 1,187 books that were written on the official history of 472 years(AD 1392-1863) from King Taejo to King Chuljong (25 generations). Among them, beewax-treated Annals show severe damages due to the deterioration of wax materials such as breaking, hardening, darkening, discoloring and whitening. Urgent measures should be taken to preserve the Annals and prevent further deterioration. Therefore, a systematic and scientific approach on the conservation and restoration of the Annals of Joseon Dynasty is definitely necessary. So it can be used an example to show how much the preservation science can conserve the paper cultural assets. In this respect, this study focuses on analyzing paper properties and deterioration behaviors of the Annals of King Sejong, the most damaged one, using non-destructive micro analysis techniques.