• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 C
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• pp.1828-1830
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• 1996

In this study, We developed the optical fiber incorporated high-voltage underground power cable which is combined optical fibers with conventional high-voltage underground power cable. Optical-Unit that optical fiber is inserted in stainless tube is tested, and we got good results enough to safe optical fibers. Also we put the optical fiber incorporated high-voltage underground power cable to the test of electrical characteristics and optical characteristics, we knew that the electrical characteristics were the same characteristics as conventional high-voltage underground power cable and the transmission loss change was almost zero.

• Restorative Dentistry and Endodontics
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• 제12권1호
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• pp.155-163
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• 1986

The purpose of this study was to measure penetration of dye stuff (2% Methylene blue, 2% Hematoxylin, 2% crystal violet and 2% safranin-O) on unfilled resin (Lang Dental MFG Co.) Hipol (Boopyung Dental Chemical Co. Macrocomposite resin) Durafill (Kulzer, Co. Microfilled Composite resin) and Heliosit (Vivadent Co. Microfilled Composite resin) The unfilled resin with dough stage was inserted into plastic tuble (5mm in diameter and 4mm in height) with condensation force of 1000 gr, 2000 gr and without condensation force. Hipol mixed on the mixed pad was inserted into the plastic tube by the same method as the unfilled resin. The microfilled resins which were Durafill and Heliosit were polymerized for 60 seconds with the visible light on each surface of the plastic tube which was upper and lower, under condensation force of 1000 gr, 2000 gr and without condensation force. All specimens were stored in the air for 24 hours, then specimens were immersed in the various kind of dye solution for different period of time (1 hour and 24 hours). These dye-treated specimens were polished horizontally until removing 0.5mm of each surface on the emery paper (#1000), and the dye penetration in the polished surface was measured under the digital microscope (Japan Fosuh). Following results were obtained 1. The penetration of dyes was the most excessive in Durafill and was not influenced on the condensation force and the period of immersion time. 2. All dyes were penetrated into Hipol, and Crystal violet was penetrated most excessively in all dyes. 3. The penetration of dye in all resins was not influenced by the period of immersion time and condensation force. 4. There was no evidence of dye penetration in unfilled resin.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2003년도 춘계종합학술대회
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• pp.546-550
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• 2003

For dual-band operation, it can be done by loading two pair of narrow slots in the equilateral-triangular patch, one embedded close to the side edges of the patch and the other inserted at the bottom edge of the patch. The obtained two operating frequencies are of same polarization planes. The frequency ratio of the two operating frequencies is turnabled by varing the positions and lengths of the inserted slots at the bottom edge of the patch. In this paper, A single-feed equilateral-triangular microstrip patch with two pairs of narrow slot for dual-frequency operation is printed on the substrate(TMN-4 Rosers Co.) of the 60 miles. the antenna radiation characteristics are calculated by Ensemble ver. 5.0 software, and compared with the experimental results.

• The Journal of Advanced Prosthodontics
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• 제8권2호
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• pp.110-115
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• 2016

PURPOSE. The purpose of this study was to compare the removal torques of a chemically modified SLActive implant and a blasted, laser-treated (BLT) implant, which were soaked in saline for 2 weeks after their surface modifications. The removal torques of the two implants were measured 4 weeks after their implantation into the bone defect area in rabbit tibias with concentrated growth factor (CGF) application. MATERIALS AND METHODS. To make artificial bone defects in the cortical layers of both tibias, an 8-mm diameter trephine bur was used. Then, prepared CGF was applied to the bony defect of the left tibia, and the bony defect of the right tibia was left unfilled. Four weeks later, the surgical sites of 16 rabbits were re-exposed. For 8 rabbits, the SLActive implants (Straumann, Switzerland) were inserted in the left tibia, and the BLT implants (CSM implant, Daegu, Korea) were inserted in the right tibia. For other rabbits, the BLT implants were inserted in the left tibia, and the SLActive implants were inserted in the right. Four weeks afger the insertion, torque removal was measured from 4 rabbits exterminated via $CO_2$ inhalation. RESULTS. No significant difference was observed between removal torques of the BLT implant and the SLActive implant (P>.05). CONCLUSION. It was found that BLT surface modification exhibited excellent osseointegration. In addition, CGF application did not affect the insertion and removal torque of the implants.

• 한국통신학회논문지
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• 제18권5호
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• pp.643-649
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• 1993

본 논문에서는 백색 가우스 잡음 Co-channel 간섭이 존재하는 채널에서의 2진 펄스 진폭변조 통신 시스템에서 주기적으로 삽입되는 프레임 동기 문제를 다루었다. Co-channel 간섭이 존재함으로서 발생되는 Correlation Rule의 성능 저하를 보이고 백색 가우스 잡음과 Co-channel 간섭이 존재하는 채널에서의 최대 프레임 동기 공식을 유도하였다. 최대 추정 동기 공식은 신호 에너지에 있어 Correlation Rule 보다 약 1dB 정도의 성능 향상을 보였다. 특히, 신호대잡음비가 0dB 이상일 경우 최대 추정 동기 공식은 최대 2dB 정도의 성능향상을 보였다.

• 한국전자통신학회논문지
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• 제17권5호
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• pp.775-782
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• 2022

본 논문에서는 보다 편리한 튜닝을 위해 Evanescent-Mode Rectangle Waveguide(EMRWG)에 삽입된 새로운 작은 직경의 원통형 포스트 커패시터를 제안하였다. EMRWG급전을 위한 제안된 구조는 입력 및 출력 끝에서 도파관과 동일한 너비와 높이를 갖는 단일 리지 직사각형 도파관을 사용하였다. 삽입된 포스트 커패시터는 EMRWG의 넓은 벽체 하부 중앙에 형성된 원형 홈과 상부에 삽입된 동심원기둥 포스트로 구성된다. 먼저 제안된 구조에 대한 등가회로 모델을 제시하였고, EMRWG와 단일 리지 도파관이 결합될 때 이상적인 변압기의 접합 서셉턴스와 권선비는 각각 HFSS(3d fullwave 시뮬레이터, Ansoft Co.)를 사용하여 두 가지 경우에 대해 시뮬레이션하였다. 얻어진 매개변수와 EMRWG의 특성을 이용하여 삽입된 기둥의 서셉턴스 및 공진 특성을 분석하였다. 중심주파수 4.5GHz, 대역폭 170MHz의 2포스트 필터는 WR-90 도파관을 이용하여 설계하였으며, 등가회로 모델에 대한 계산과 HFSS와 CST를 이용한 시뮬레이션 결과가 서로 일치하였다.

• Journal of Magnetics
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• 제11권3호
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• pp.115-118
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• 2006

Co-ferrite nanoparticles have been synthesized by the decomposition of iron(III) acetylacetonate, $Fe(acac)_3$ and Co acetylacetonate, $Co(acac)_2$ in benzyl/phenyl ether in the presence of oleic acid and oleyl amine at the refluxingtemperature of $295^{\circ}C$/$265^{\circ}C$ for 30 min. before cooling to room temperature. Particle diameter detected by PSA can be turned from 4 nm to 20 nm by seed-mediated growth and reaction conditions. Structural and magneticcharacterization of Co-ferrite were measured by use of HRTEM, SAED (selected area electron diffraction), XRD and SQUID. The as-synthesized Co-ferrite nanoparticles have a cubic spinel structure and coercivity of 20 nm $CoFe_{2}O_{4} nanoparticles reached 1 kOe at room temperature and 18 kOe at 10 K.

• 한국자기학회지
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• 제5권6호
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• pp.963-967
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• 1995

Ni/Cu 인공초격자의 계면에 얇은 NiFeCo와 NiFe층을 삽입시 Ni/Cu 인공초격자의 자기 저항 거동에 미치는 영향에 관해 연구하였다. NiFe층이 Ni/Cu 인공초격자의 계면에 삽입된 경우 6%의 자기저항과 50 Oe의 포화자장을 보였으며 이때의 자기저항곡선은 hysteresis를 거의 보이지 않았다. NiFeCo층이 삽입된 경우는 자기저항값은 7%를 보였으나 포화자장과 hysteresis가 많이 증가하였다. 교류자장원을 이용한 동적자기저항을 측정한 결과 bias 자장하에서 자기저항의 증가폭이 NiFe층을 삽입한 경우가 NiFeCo를 삽입한 경우보다 컸으며 이는 hysteresis가 작았기 때문으로 해석된다.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2003년도 하계학술연구발표회 및 한.일 공동심포지엄
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• pp.130-131
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• 2003

Mn 합금형태의 반강자성체 물질인 IrMn은 열처리 전과 후에 교환결합세기를 400 Oe 이상 쉽게 얻을 수 있다. IrMn 스핀밸브나 터널링 접합 소자는 높은 교환 결합세기와 우수한 열적안정성으로 인하여 자기센서로서 실용화하기에 이르렀다. Mn이 계면의 이웃층으로 확산이 왕성하므로 자성층의 종류에 따라 교환결합세기의 변화에 심각한 영향을 주게 된다. 더욱이 열처리시에 일어나는 Mn 확산 및 이동을 통해 이웃층의 계면 손상과 자기 수송 특성을 완화 내지 손상시키는 중요한 요인으로 밝혀져 있다. 열처리 전과 후에 따른 자기적 특성의 변화가 비교적 큰 IrMn에서 Mn 성분에 따른 fcc 결정성 및 교환결합세기의 변화를 상세히 관찰함으로서 Mn 확산에 의한 반자성층의 Mn 결핍 또는 상변화를 극-초박막 Mn층 삽입으로 보상효과를 이용하여 교환결합세기 강화 및 열적안정성을 향상시킨 실험결과를 소개한다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.1401-1403
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• 1996

A new method is proposed for tracking the optimum points in nonstationary problem via genetic search. Cache Pool to save the past genetic informations is added to population in search using Sexual Reproduction Genetic Algorithm(SRGA). In Cache Pool, elite chromosomes from population are accumulated. A best Individual is made up from these chromosomes in varying environment and inserted into the newly reproduced population every generation. Experimental results indicate changing global optima are accurately identified and followed.