• Journal of Korea Multimedia Society
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• v.7 no.9
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• pp.1321-1328
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• 2004

In this article, we present a new DICOM object able to create image-based annotations in DICOM image. Since the proposed image-based annotation uses images themselves of annotation, various types like character, sketch, and scanning image, etc., can be imported into annotation easily. The proposed annotation is inserted into DICOM image directly but they do not influence original DICOM image quality by using independent data channel. The proposed annotation is expected to be very useful to medium and small clinics that cannot afford picture archiving and communication systems or electronic medical record.

• The Transactions of the Korean Institute of Power Electronics
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• v.2 no.3
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• pp.44-50
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• 1997

This paper describes an indirect sensing method for the rotor flux position of interior permanent magnet (IPM) brushless DC motors. The phase inductances of an IPM motor vary appreciably according to the rotor position. The waveform characteristics of the terminal voltage of IPM brushless DC motors is analysed and a simple and practical method for indirect sensing of the rotor position is proposed. A compact and economical sensorless drive is implemented and tested using a 87c196mc 16-bit one-chip microprocessor. The experimental results show the validity of the proposed method. The drive is applied to drive a compressor of air-conditioner and works well from 1,200 to 6,600 [rpm].

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.26 no.10
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• pp.726-730
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• 2013

In order to develop a high voltage insulation material, spherical silicas with two average particle sizes of 5 ${\mu}m$ and 20 ${\mu}m$ were mixed in different mixing ratios (1:0, 0.7:0.3, 0.5:0.5, 0.3:0.7, 0:1) and their total filling content was fixed at 65 wt%. In order to observe the dispersion of the spherical silicas and the interfacial morphology between silica and epoxy matrix, field emission scanning electron microscope (FE-SEM) was used. The electrical insulation breakdown strength was estimated in sphere-plate electrodes with different insulation thicknesses of 1, 2, and 3 mm. Electrical insulation breakdown strength decreased with increasing mixing ratio of 5/20 ${\mu}m$ and the thickness dependence of the breakdown strength was also observed. The tensile strength of the neat epoxy was 82.8 MPa as average value and its increased with decreasing particles size and that of epoxy/silica (2 ${\mu}m$) was 107 MPa, which was 130.8% higher value.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.9
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• pp.1504-1510
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• 2016

The aim of this study is to improve properties both glass transition temperature($T_g$) and coefficient of thermal expansion(CTE) using epoxy/micro-nano alumina composites with adding glycerol diglycidyl ether (GDE:1,2,3,5g). This paper deals with the effects of GDE addition for epoxy/micro alumina contents (40, 50, 60wt%)+surface modified nano alumina(1_phr) composites. 20 kinds specimen were prepared with containing micro, nano alumina and GDE as a micro composites(10, 20, 30, 40, 50, 60, 70wt%) or a nano/micro alumina composites(1phr/40, 50, 60wt%). Average particle size of nano and micro alumina used were 30nm and $1{\sim}2{\mu}m$, respectively. The micro alumina used were alpha phase with Heterogeneous and nano alumina were gamma phase particles of spherical shape. The glass transition temperature and coefficients of thermal expansion was evaluated by DSC and TMA. The glass transition temperature decreased and coefficients of thermal expansion become smaller with filled contents of epoxy/micro alumina composites. On the other hand, $T_g$ and CTE as GDE addition variation(1,2,3,5g) of epoxy/micro-nano alumina composites decreased and increased respectively.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.65 no.9
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• pp.1511-1517
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• 2016

The aim of this study is to improve of properties for electrical AC insulation breakdown strength using epoxy/micro-nano alumina composites with adding glycerol diglycidyl ether (GDE:1,3,5g). This paper deals with the effects of GDE addition for epoxy/micro alumina contents (40,50,60wt%)+surface modified nano alumina(1_phr) composites. 14 kinds specimen were prepared with containing epoxy resins, epoxy micro composites and epoxy nano-micro alumina mixture composites. Average particle size of nano and micro alumina used were 30nm and $1{\sim}2{\mu}m$, respectively. The micro alumina used were alpha phase with Heterogeneous and nano alumina were gamma phase particles of spherical shape. The electrical AC insulation breakdown strength was evaluated by sphere to sphere electrode system and raising velocity 1kV/s. The AC breakdown strength decreased insulation properties of multi-composites according to increasing micro alumina and GDE addition contents.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.452-453
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• 2006

저압 개폐기는 에어컨, 냉동기, 쇼케이스, 산업용 청소기, 전기 온수기, 건조기, 공조기, 펌프, 콤프레셔 등의 모터제어 및 히터와 조명기기의 개폐 등에 광범위하게 이용되는 개폐장치이다. 저압 전자개폐기는 수 천회에서 수백만회까지 빈번한 개폐사용조건으로 인해 시험규격에서는 개폐시험을 통해 수명을 검증하도록 되어 있다. 이 개폐시험 회로는 규정된 전압, 전류, 역률 조건을 맞추기 위해 저항과 리액터를 직렬 연결하여 구성한다. 또한 모터와 같은 리액터 부하를 개폐하는 개폐기의 경우는 전류차단 순간 과도회복전압의 피크비와 주파수를 규정하여 적용하고 있다. IEC60947-1에서는 과도회복전압의 피크비와 주파수에 대한 규정값을 제시하고 있으며 제시된 값을 제어하기 위한 회로를 제시하고 있다. 과도회복전압의 피크비와 주파수는 개폐기 접점의 절연성능과 밀접한 관계가 있으며 수명에 치명적인 영향을 미친다. 본 연구에서는 LS산전(주) 부하개폐시험 회로의 과도회복전압 조건과 영향을 설명하고 제어하기 위한 저항과 커패시터를 적용하는 방법을 제안하고자 한다.

• Korean Journal of Veterinary Research
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• v.35 no.4
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• pp.683-689
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• 1995

임상적으로 건강한 New Zealand White 종인 수컷 토끼에서 항생제 norfloxacin(NFX)의 체내 동태를 조사하기 위하여 체중 kg당 5mg을 정맥 및 경구 투여하였다. 그 결과 빠른 분포기와 소실기를 갖는 2-콤파트먼트 모델 양상으로 나타났다. 혈장에서의 약물분석은 HPLC로 실시하였는데, 이동상은 acetonitrile/0.01M phosphate buffer/ 10% citric acid 1mM heptane sulfonic acid(10/70/20)이었고, 흡수 파장은 274nm에서 실시하였다. 정맥 투여후, 생물학적 반감기는 3.14시간으로 나타났으며, 분포반감기는 0.38시간으로 빠른 분포를 보여주었다. 최고 혈중농도는 $24.27{\mu}g/ml$로 계산되었으며 청소율은 0.68ml/kg/h로 분석되었다. 경구 투여후, 최고 혈중 농도와 최고 혈중 도달 시간은 $0.86{\mu}g/ml$과 0.43시간으로 각각 계산되었다. 이때의 생물학적 반감기는 3.61시간으로 정맥 투여시와 유의성 있는 차이는 없었으며, 흡수 반감기는 0.17시간으로 빠른 흡수를 보여주었다. 생체이용율은 30%로 나타났으며, 0.2-1.6g/ml인 치료혈중 농도 범위에서 혈장 결합율은 26%로 나타나, 토끼에서 항생요법은 구강 투여시 초기 투여량은 2.71mg/kg이며, 유지 투여량은 12시간마다 2.54mg/kg이 적당한 것으로 분석되었다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.10 no.5
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• pp.89-96
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• 2010

In this paper, "a wireless camera image transmission system" is aimed for the free camera shooting in the indoor and outdoor environments. Currently in broadcasting program production environments, because the cable connections between TV OB VAN(outside broadcasting VAN) and EFP camera or ENG camera have many obstacles and limits of distances, it is very unconvienent for the free camera shooting. Therefore in this paper, wireless image transmission device and receiving device in DVB-T broadcasting are developed. In this paper, analog composite image signal output camera, image signal compression MPEG-2 system and COFDM mage transmission system are produced and experimented. The results for the image and transmission system had good QoS values and from this results, it is possible to apply TV program productions and wireless CCTV device industries.

• Journal of the Korean Geotechnical Society
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• v.19 no.5
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• pp.253-261
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• 2003

Mechanical behavior of composition pound improved by sand compaction pile (SCP) with low replacement area ratio could be more significantly affected by mechanical interaction between sand piles and clays than that of clay ground improved by SD or SCP with high replacement area ratio. It is essential to elucidate the mechanical interaction in the improved clay ground, in order to accurately estimate behavior in reducing settlement of the improved ground and increasing strength of clays. In this paper, through a series of model tests of composition ground improved by SCP with low replacement area ratio, each mechanical behaviors of sand piles and clays in the composition ground during consolidation was elucidated, together with stress sharing behavior between sand piles and clays.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.97-97
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• 2010

A new electric application method was developed to prepare epoxy/organoclay nanocomposite for the electrical insulation in the AC electric fields and it could be also used in the field of various viscous polymer/organoclay systems. The applied AC electric field condition was as follows; (1) inter-electrode distance: 40 mm, (2) application voltage: 3-11 kV, (3) frequency: 60~1,000 Hz, and (4) application time: 0~60 min. To characterize the epoxy/clay nanocomposite, WAXS and TEM analyses were confirmed. In order to explain how the organic modifier affects the exfoliation phenomena, a mechanism of the oscillating collision of the quaternary ammonium head was proposed and the effects of the AC voltage and frequency and the organoclay content were studied.