• The Magazine of the IEIE
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• v.25 no.6
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• pp.53-61
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• 1998

• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.893.2-893.2
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• 2006

• Proceedings of the Korean Nutrition Society Conference
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• 2003.10a
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• pp.201-201
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• 2003

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.61-64
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• 2011

디지털화의 눈부신 발전으로 인해 대부분의 기록물들은 종이 위주의 생산방식에서 전자문서방식으로 패러다임이 변하고 있다. 이에 따라 정부적인 차원에서 이러한 전자문서에 대한 장기보존에 대한 연구가 요구되고 있으며, 이미 많은 국가에서 표준을 정의하여 기록물에 대한 장기보존 기법에 대한 연구가 활발하게 진행되고 있다. 이들 시스템의 대부분은 IS014721 표준으로 지정된 디지털 객체의 장기보존을 위한 참조모델인 OAIS(Open Archival Information System) 정보패키지 개념으로 사용한다. 이 정보패키지 방법은 보존하고자 하는 콘텐츠에 메타데이터를 두어 콘텐츠와 함께 인캡슐레이션을 함으로써 보존 및 활용을 가능하게 해준다. 그러나 기존에 연구는 장기보존에 관한 시스템 설계가 대부분이었고, 실제로 패키지를 구성하고 저장하는 방법에 대한 연구는 미진한 실정이었다. 따라서 본 논문에서는 멀티미디어 기록물을 위한 장기 보존 패키지를 설계 및 적용 하고자 한다. 이를 위하여 OAIS 참조모델을 기반으로 장기 보존을 위한 대용량 비디오 관리 시스템의 보존 정보 패키지의 구조를 제안 하였다. 장기보존 패키지는 기록물 그 자체와 기록물을 보존하기 위한 정보, 기록물을 설명하기 위한 정보를 저장한다. 또한, 추후 활용과 배포를 위하여 기록물 패키지의 정보를 저장하는 Meta-AIP와 실제로 기록물을 저장하는 Real-AIP로 구성되어 있다. 또한, METS를 이용한 실제 패키지의 예를 보임으로써 비디오 기록물 관리시스템에 적용 가능 함을 보였다.

• Journal of the Korean housing association
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• v.25 no.2
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• pp.99-107
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• 2014

This study attempts to provide implications for developing more efficient and effective community-based support system with AIP perspective for the elderly in Korea. The main purpose of this study is to analyze Japan's community-based integrated care system that respond to the concept of aging in place (AIP) and its cases. In Japan, they have offered Community-Based Service since 2005, and the advanced system which include integrated support categories and consolidated community/local resources will started in 2015 by The revision of Long-term Care Insurance policy, 2012. The result of policy analysis and case studies are as follows: 1) The suggestion for ideal support system model promoted a relationship of multiple agents include private sectors even resident and senior and specified responsibility sharing, 2) the system proposed Not only health and medical care support, living care and residence are also addressed as a comprehensive support. and 3) the amount of available community resource is different by each local government, but the effort to get the understanding of community residents and to connect with a potential community resource is also essential aspect to set effective community-based support system.

• 한국정보디스플레이학회:학술대회논문집
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• 2002.08a
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• pp.625-627
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• 2002

MgO thin films were deposited on glass and (100) Si substrates by an Arc Ion Plating (AIP) equipment using a magnesium metal target at various oxygen gas flow. In this work, we investigated the relationship between the structural properties and the discharge characteristics of MgO coating layers. X-ray diffraction and AFM have been used to study behaviors of the structure and surface morphology. The optical transmittance and the ion induced secondary electron emission coefficient of the MgO films have been also measured. The resistivity of the deposited MgO films was gradually increased from 0.17 G ohm/${\square}$ to 0.35 G ohm/${\square}$ with the oxygen gas flow. The growth rate of the MgO coating layer was decreased with increasing the oxygen gas flow, while the optical transmittance was improved.

• Journal of Surface Science and Engineering
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• v.44 no.6
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• pp.269-276
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• 2011

Phase evolution and tribological behavior of Cr-Mo-N multi compositional films with different interlayer were investigated. The films were deposited by hybrid PVD (Physical Vapor Deposition) system consisted of dc unbalanced magnetron (UBM) sputtering and arc ion plating (AIP) sources. A pure molybdenum (Mo) was used as sputtering target and also a pure Cr was used as AIP target to form the Cr-Mo-N films. Various growth planes were found, no textured surface, in all of the multi composition films. Maximum value of microhardness was measured in Cr-Mo-N film with Mo interlayer as 29 GPa. Composition film was mainly showed the aspect of the adhesive wear than CrN film. The friction coefficient was decreased from 0.6 for pure CrN coating to 0.35 for Cr-Mo-N film with Mo interlayer. This result may come from the formation of metal oxide tribo-layer which is known as solid lubricant during the wear test.

• Journal of the Korean Society for Heat Treatment
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• v.20 no.2
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• pp.78-83
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• 2007

CrN coatings were deposited by cathodic arc ion plating method on the SKD11 steel substrates. Atmosphere temperature of $350^{\circ}C$, arc current of 90 A, nitrogen partial pressure of 1.0-5.3 Pa, and negative bias voltage of 30-135 V were selected. The characteristics of microstructure were investigated with XRD. Hardness, adhesion and friction coefficient measured by microhardness tester, scratch tester, and ball on disk tribometer. Microstructures depended on nitrogen partial pressure and bias voltage. The preferred orientation of the films was changed from (200) to (111) with decreasing pressure and increasing bias voltage. Adhesion properties related with microstructure, but microstructure changes slightly influenced on hardness and friction properties. The critical load.($Lc_1$) and hardness of CrN films deposited at 5.3 Pa, -30 V condition were 55 N(HF1), $2157{\pm}47\;Hk_{0.025}$. The friction coefficient were about 0.5 under dry condition.

• Journal of Surface Science and Engineering
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• v.35 no.4
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• pp.199-205
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• 2002

TiN and TiAlN films were deposited on SKD 11 steel substrates by an arc ion plating (AIP) technique. The crystallinity and morphology for the deposited films were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The mechanical properties of both films were investigated through the indentation, impact, and wear test. Those films fairly adherent to SKD 11 steel substrate, showed hardness values of 2300 $\pm$ 100kg/$\textrm{mm}^2$ and 3200 $\pm$ 100kg/$\textrm{mm}^2$ with a load of 25g, respectively. During impact test, TiAlN films showed much superior impact wear resistance to TiN films. It could be suggested that the TiN films was failed relatively by plastic deformation with oxidation during impact test, while TiAlN films was failed by brittle fracture and resisted the oxidation by the impact energy. The friction coefficient of TiAlN films became lower than that of TiN films at high sliding speed condition although it was higher than that of TiN films at low speed. Therefore, TiAlN films was suggested to be more advantageous than TiN films for high speed machining fields.

• Journal of electromagnetic engineering and science
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• v.11 no.2
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• pp.128-132
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• 2011

In interference tolerance based spectrum sharing systems, primary receivers (PRs) are protected by a predefined peak or average interference power constraint. To implement such systems, cognitive radio (CR) transmitters are required to adjust their transmit power so that the interference power received at the PR receivers is kept below the threshold value. Hence, a CR-transmitter requires knowledge of its channel and the primary receiver in order to allocate the transmit power. In practice, it is impossible or very difficult for a CR transmitter to have perfect knowledge of this channel state information (CSI). In this paper, we investigate the impact of imperfect knowledge of this CSI on the performances of both a primary and cognitive radio network. For fixed transmit power, average interference power (AIP) constraint can be maintained through knowledge of the channel distribution information. To maintain the peak interference power (PIP) constraint, on the other hand, the CR-transmitter requires the instantaneous CSI of its channel with the primary receiver. First, we show that, compared to the PIP constraint with perfect CSI, the AIP constraint is advantageous for primary users but not for CR users. Then, we consider a PIP constraint with imperfect CSI at the CR-transmitter. We show that inaccuracy in CSI reduces the interference at the PR-receivers that is caused by the CR-transmitter. Consequently the proposed schemes improve the capacity of the primary links. Contrarily, the capacities of the CR links significantly degrade due to the inaccuracy in CSI.