• 한국자기학회지
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• 제5권5호
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• pp.395-398
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• 1995

For the core loss measurement under arbitrary waveform of magnetic induction, we have constructed a single sheet core loss measuring system which consists of yoke apparatus for single sheet of $10\;cm{\times}10\;cm$, arvitrary waveform synthesizer, B-feedback system, and two channel transient recorder. Using the constructed measuring system, we can measure core loss including higher harmonics up to 2 kHz. Core loss of non-oreinted electrical steel was increased exponentially when higher harmonic frequency was increased or amplitude of harmonic induction was increased.

• Design & Manufacturing
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• 제9권1호
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• pp.9-13
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• 2015

The HEV/EV Traction Motor Core manufacturing technology is a core component of Traction Motor Core is a key technology for the manufacture of eco-friendly automotive industry is essential for the competitiveness of the country must obtain the technology. This study was performed to develop a Rotor Core of the HEV/EV Traction Motor using the first time in Korea multi-gate BMC injection molding technique. Executed by the experiment of this study are as follows. Study 1: Developed a multi-gate BMC injection mold for the magnet fixed to the Rotor Core. Study 2: Developed a production implementation and manufacturing technology of the Rotor Core. In this study, the develop products and manufacturing technologies implemented by the BMC injection mold development for Magnet fixed to the Rotor Core and the results are discussed.

• 한국응용과학기술학회지
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• 제19권4호
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• pp.265-272
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• 2002

$CaCO_{3}$ absorbed sodium lauryl sulfate (SLS) surfactant was prepared, Core-shell polymers of inorganic/organic pair, which have both core and shell component, were synthesized by sequential emulsion polymerization using styrene(St) as a shell monomer and potasium persulfate (KPS) as an initiator, We found that when $CaCO_{3}$; core prepared by adding 2,0 wt% SLS, $CaCO_{3}$ core/PSt shell polymerization was carried out on the surface of $CaCO_{3}$ particle without forming the new PSt particle during St shell polymerization in the inorganic/organic core-shell polymer preparation, The structure of core-shell polymer were investigated by measuring the degree of decomposition of $CaCO_{3}$ using HCl solution, thermal decomposition of polymer composite using thermogravimetric analyzer and morphology by scanning electron microscope.

• 한국수산과학회지
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• 제36권3호
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• pp.290-297
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• 2003

To describe vertical distribution of dinoflagellate cysts in bottom sediments from Gwangyang Bay, three short-core sediment samples were collected with a gravity core sampler on 24 August 2001: St. 1 core (27.5 cm) in the northeastern part of the bay, St. 14 core (30.5 cm) in the southwestern part, and St. 16 core (25.9 cm) near Yeosu Sound. Total cyst densities generally decreased from the top of the sediment samples through the bottom. The highest cyst densities were observed at 2-3 cm in St. 1 core, 4-5 cm in St. 14 core, and 0-1 cm in St. 16 core respectavely. Living cysts were observed till the bottom of the sediment samples. The increase of heterotrophic dinoflagellate cyst proportion may indicate that the eutrophication process was recently escalated in the study area.

• 전기전자학회논문지
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• 제17권4호
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• pp.564-569
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• 2013

현재 임베디드 기기는 멀티코어로 급성장하고 있으며 빠른 부팅 속도를 요구하고 있다. 하지만 기존의 부팅 기술은 하나의 코어만을 사용하고 있다. 따라서 본 논문에서는 분석 도구를 통해 안드로이드 부트 프로세스를 분석후, CPU연산이 많은 곳에 병렬 기법을 적용하는 방법과 멀티 코어의 성능을 최대로 끌어내기 위해 CPU주파수 정책을 변경함으로써 멀티코어 기반에서 안드로이드 부팅 속도 향상 방법에 대해 제안한다. 본 논문의 제안 방법을 듀얼 코어 S5PV310과 쿼드 코어 Exynos4412에 각각 적용시킨 뒤 부팅 완료 시간을 측정하였으며 기존의 방법과 제안 방법의 시간을 비교한 결과 듀얼코어와 쿼드코어에서 각각 약 20.71%, 약 31.34%의 속도 성능향상을 가져왔다.

• 한국기계가공학회지
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• 제15권4호
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• pp.60-66
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• 2016

This study used an ultrasound infrared thermography technique to detect issues in the motor core of typical power equipment. The current defect inspection method of the motor core is often incomplete (due to the limits of visual inspection) and thus the reliability of the motor core is reduced. Therefore, in this study, experiments were carried out to increase the reliability of the test by using an ultrasonic infrared thermal non-destructive inspection method to image the motor core. The ambient temperature of the experimental system was maintained at $25^{\circ}C$. Experiments were carried out to examine a damaged motor core and a defect-free motor core. Experimental results confirm the technique clearly detected defects in the motor core, thereby confirming the possibility of using this technique in the field.

• 한국주조공학회지
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• 제33권4호
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• pp.147-156
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• 2013

The effects of core materials on the microstructure and mechanical properties of Al casting products have been investigated. The Al casting samples and cylinder head were fabricated by using organic and inorganic binder core respectively, and their microstructure and mechanical properties were evaluated. The Al casting samples fabricated by using inorganic core showed the better mechanical properties such as tensile strength and elongation than those of the Al casting samples fabricated by using organic core. That's because the Al casting samples contained small amount of pore defects and had fine microstructure compared with the Al casting samples fabricated by using organic core. Also, the use of inorganic core effectively reduced harmful gas emission and pollution.

• 정보관리학회지
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• 제15권2호
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• pp.137-162
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• 1998

본 연구의 목적은 디지털 도서관 환경에서 도서, 비도서자료 및 인터넷자원을 포괄적으로 기술할 수 있는 서지레코드 핵심데이터요소를 제시하는데 있다. 이를 우해 현대 편목규칙의 기반이 되는 AACR2R의 기술사항, 목록의 비용효과를 효율적으로 거둘수 있는 미국국회도서관의 핵심레코드(Core Record), 인터넷자원을 기술하기 위해 제안된 더블린코어(Dublin Core) 메타데이터, KORMARC 등의 데이터요소를 비교분석하였다. 비교결과를 토대로 핵심데이터요소를 필수요소, 적용 가능한 경우에 필수요소, 선택요소로 구분하여 제안하였다.

• 한국정보통신학회논문지
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• 제12권8호
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• pp.1448-1455
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• 2008

본 논문은 대부분의 Linux 운영체제에서 지원해 주는 System V의 IPC 중 하나인 Shared Memory를 Dual Core 시스템 상에서 동작하도록 설계한다. Linux에서 사용되는 Shared Memory는 동일한 메모리 영역에 여러 개의 프로세스가 접근할 수 있도록 해 주는 기술이 다. 본 논문에서는 Shared Memory의 큰 두 갈래 중 커널 단계에서 처리되는 SVR(System V Release) 형식의 Shared Memory를 다룬다. 본 논문에서는 리눅스 운영체제의 공유 메모리 기능을 Dual Core 시스템에서 동작하도록 설계한다. 본 논문에서 제안하는 Dual Core 시스템에서 공유 메모리 기능 설계 방안은 듀얼 코어를 활용하여 기존의 단일 처리기 시스템에서보다 성능을 향상시킬 수 있도록 한다. 공유 메모리를 이용한 프로세스의 동작이 별개의 CPU에서 동작되도록 함으로써 성능 향상을 꾀한다.

• 국제강구조저널
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• 제18권5호
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• pp.1541-1559
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• 2018

This paper addresses the dynamic loading characteristics of the shock tube onto sandwich steel beams as an efficient and accurate alternative to time consuming and complicated fluid structure interaction using finite element modeling. The corrugated sandwich steel beam consists of top and bottom flat substrates of steel 1018 and corrugated cores of steel 1008. The corrugated core layers are arranged with non-uniform thicknesses thus making sandwich beam graded. This sandwich beam is analogous to a steel beam with web and flanges. Substrates correspond to flanges and cores to web. The stress-strain relations of steel 1018 at high strain rates are measured using the split-Hopkinson pressure. Both carbon steels are assumed to follow bilinear strain hardening and strain rate-dependence. The present finite element modeling procedure with an improved dynamic impulse loading assumption is validated with a set of shock tube experiments, and it provides excellent correlation based on Russell error estimation with the test results. Four corrugated graded steel core arrangements are taken into account for core design parameters in order to maximize mitigation of blast load effects onto the structure. In addition, numerical study of four corrugated steel core placed in a reverse order is done using the validated finite element model. The dynamic behavior of the reversed steel core arrangement is compared with the normal core arrangement for deflections, contact force between support and specimen and plastic energy absorption.