• The Transactions of the Korean Institute of Electrical Engineers A
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• v.48 no.5
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• pp.487-493
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• 1999

To predict the background level of harmonics produced by household appliances, information on the site, capacity, and usage pattern of these loads arenecessary. However, as household appliances are distributed widely and various in type, it is difficult to know these kinds of information accurately. This paper presents a method for estimation of background level of harmonics produced by distributed harmonic sources with readily available data. Large industrial customers are excluded from this study. In this paper, customers are grouped into three classes, i.e. residential, commercial, and industrial. Typical customers for each class are assumed and characteristics of their equipments are modeled. As the proposed method does not require harmonic measurement, it can be employed to forecast voltage total harmonic distribution (VTHD) in the future. An illustrative example is described.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.838-840
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• 2005

그동안 업무 전산화 차원에서 정보화를 추진해 오던 대학들이 최근 디지털 캠퍼스 구축의 일환으로 온라인 학사행정 시스템, 모바일 캠퍼스, 전자도서관 등을 잇따라 선보이며 정보화 영역을 넓히고 있다. 이러한 유비쿼터스의 대열에서 핵심기술로 전파식별(RFID, Radio Frequency IDentification)과 함께 U-센서네트워크가 두각을 나타내고 있다. 본 논문에서는 현재 두각을 나타내고 있는 RFID태그 시스템을 기반으로 ERP를 도입한 행정업무의 통합시스템 구축 및 디지털 도서관 시스템, 다양한 서비스 제공이 가능한 스마트카드 시스템 등 U-캠퍼스 구축을 위한 통합관리시스템 모텔을 제안하고자 한다. 통합관리시스템은 교육기관의 노동집약적이던 시스템에서 벗어나 투명하고 효율적인 행정관리와 원스톱 서비스 제공을 통해 보다 질 높은 교육환경을 제공할 수 있으며 사용자는 요구와 환경에 맞는 개인화$\cdot$지식화된 지능형 교육 서비스를 받을 수 있다.

• Proceedings of the KIEE Conference
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• 1996.11a
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• pp.149-151
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• 1996

This paper reports the measurement results of the harmonic currents in the household and office appliances. The harmonic currents of 10 items are measured up to 20th order using the no distortion source. These results can be used as a raw data in determining the harmonic current limit in the household and office appliances.

• Proceedings of the KIEE Conference
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• 1996.07b
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• pp.817-819
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• 1996

This paper presents an algorithm for calculation of harmonic distribution in distribution systems. In distribution systems, most state variables are not given explicitly. To calculate the harmonic distribution in distribution systems, state estimation is necessary. In this paper, power usage and harmonic current injection is estimated for each node from practically available data. The estimating procedure is illustrated by examples.

• Proceedings of the KIEE Conference
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• 1996.11a
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• pp.146-148
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• 1996

This paper reports the measurement results of the harmonic voltage in the distribution systems. These results were obtained from the harmonic voltage survey carried out at six industrial customers, three department stores, two apartment buildings, six substations for subway, etc. The properties in each place are analyzed.

• Journal of Applied Biological Chemistry
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• v.57 no.2
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• pp.175-178
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• 2014

Three phytosterols of rare occurrence, schleicheol 2 (1), $7{\beta}$-hydroxysitosterol (2), and $7{\alpha}$-hydroxysitosterol (3), were isolated from the n-hexane fraction of rice (Oryza sativa) bran, for the first time. Some nuclear magnetic resonance (NMR) assignments in the literatures are inaccurate. This study employed two-dimensional NMR experiments to identify exact peak assignments.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.06a
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• pp.259-259
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• 2007

The low temperature sintering of dolomite type borates, $CaZr(BO_3)_2$[CZB] ceramics and their microwave dielectric properties were investigated The sintering temperature of CZB ceramics could be reduced from $1150^{\circ}C$ to $925^{\circ}C$ by the addition of sintering additive. $CaZrO_3$, $ZrO_2$ and $CaB_2O_4$ second phases were found in the CZB ceramics. The syntheses, sintering properties, microstructures, and dielectricnproperties of dolomite-type borates were examined by XRD, thermal analysis, electron microscopy, network analyzer, and the results are discussed intensively. The compatibility with silver electrode was also explored.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.296-297
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• 2006

A conventional oxide method was used to fabricate $Ba_{0.5}Sr_{0.5}TiO_3$(BST) ceramic plates doped by MgO from 10 to 60 wt%. The structural and dielectric properties of BST were investigated as a fraction of MgO dopant concentration. The dielectric properties of the MgO doped BST were strongly dependent on the MgO contents. The dielectric constant and dielectric loss of MgO doped BST decreased with increasing MgO content.

• Macromolecular Research
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• v.16 no.2
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• pp.149-154
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• 2008

UV-curable electrolytes inks were prepared by dissolving [2-[(methacryloyloxy)ethyl]dimethyl]propylaminium bromide (MEPAB), 1,5-[bis(2-methacryloxyethyl)dimethyl ammono]penthane dibromide (MDAPD), hexafunctional reactive oligomer (SP1013), trimethylolpropane triacrylate (TMPTA) and a photoinitiator in methanol/2-methoxyethanol. The compositions of the electrolyte inks were MEPAB/MDAPD/SP1013/TMPTA=6/24/17.2/12.8, 15/15/17.2/12.8 and 24/6/17.2/12.8. Humid-membranes were deposited on a gold electrode/alumina electrode using an ink-jet printer equipped with a UV lamp followed by immediate UV curing. The humidity-sensing characteristics including hysteresis, frequency and temperature dependence, response time and water durability were estimated.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.434-437
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• 2015

스마트폰 사용자가 급격하게 증가함에 따라 BYOD(Bring Your Own Device)정책을 펼치는 회사들이 많아졌지만 스마트폰 악성코드로 인해 회사 네트워크 전체가 위험한 상황에 직면해있다. 현재 다양한 스마트폰 악성코드 탐지 기법들이 연구되고 있지만 대부분 단일 어플리케이션을 대상으로 탐지를 수행하고 네트워크 환경과는 독립적으로 탐지한다는 단점이 존재한다. 따라서 본 논문에서는 네트워크 환경을 고려한 Tagging 기반의 프로세스 행위 감시 에이전트를 제안한다.