• 한국문헌정보학회지
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• 제43권1호
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• pp.189-214
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• 2009

본 연구에서는 정기간행물 기사색인 서비스의 정보자원으로서의 중요성을 인식하고, 포커스 그룹 인터뷰를 통해 이용자의 정기간행물 기사색인 서비스에 대한 요구사항과 국내외 정기간행물 기사색인 서비스 분석하였다. 이러한 분석을 통해 본 연구는 국내 정기간행물 기사색인의 방향성으로 이용자에게 심리스(seamless)한 서비스를 제공할 것을 제시하며 이를 위해 협력 기반 기사색인 구축, 공유, 검색 시스템의 마련, 표준 메타데이터 구축, 전거파일 구축, 이용자 참여형 서비스 구축, 패싯 기반 다각적 정보탐색 기능 제공, 식별체계 구축 등을 제시하였다.

• 한국분말재료학회지
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• 제13권2호
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• pp.119-123
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• 2006

The grain growth behavior of $0.95Na_{1/2}Bi_{1/2}TiO_{3}-0.05BaTiO_{3}$ (NBT-5BT) has been investigated with respect to the grain shape. The powder compacts of NBT-5BT were sintered at 1200 for various times. The corresponding equilibrium shape was a round-edged cube with flat {100}-faces. Abnormal grains were not observed in the specimens sintered for 1 to 12 h but abnormal grains appeared when sintered for 24 h. Before the formation of abnormal grains, a valley was observed in the measured grain size distribution of NBT-5BT, showing that the grain size distribution was a combination of two unimodal distributions. The present result suggests that the grain growth in NBT-5BT was governed by the growth of facet planes which would occur via 2-dimansional nucleation and growth.

• 제어로봇시스템학회논문지
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• 제22권10호
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• pp.811-816
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• 2016

In light of recently developed 3D printers for rapid prototyping, there is increasing attention on the 3D scanner as a 3D data acquisition system for an existing object. This paper presents a prototypical 3D scanner based on a striped laser light image. In order to solve the problem of shadowy areas, the proposed 3D scanner has two cameras with one laser light source. By using a horizontal rotation table and a rotational arm rotating about the latitudinal axis, the scanner is able to scan in all directions. To remove an additional optical filter for laser light pixel extraction of an image, we have adopted a differential image method with laser light modulation. Experimental results show that the scanner's 3D data acquisition performance exhibited less than 0.2 mm of measurement error. Therefore, this scanner has proven that it is possible to reconstruct an object's 3D surface from point cloud data using a 3D scanner, enabling reproduction of the object using a commercially available 3D printer.

• Journal of Information Processing Systems
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• 제15권6호
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• pp.1406-1421
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• 2019

The Internet-of-Things (IoT) has been deployed in almost every facet of our day to day activities. This is made possible because sensing and data collection devices have been given computing and communication capabilities. The devices implement System-on-Chips (SoCs) that incorporate a lot of functionalities, yet they are severely constrained in terms of memory capacitance, hardware area, and power consumption. With the increase in the functionalities of sensing devices, there is a need for low-cost synthesizable processors to handle control, interfacing, and error processing. The first step in selecting a synthesizable processor core for low-cost devices is to examine the hardware resource utilization to make sure that it fulfills the requirements of the device. This paper gives an analysis of the hardware resource usage of ten synthesizable processors that implement the Reduced Instruction Set Computer Five (RISC-V) Instruction Set Architecture (ISA). All the ten processors are synthesized using Vivado v2018.02. The maximum frequency, area, and power reports are extracted and a comparison is made to determine which processor is ideal for low-cost hardware devices.

• 한국항해학회지
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• 제8권1호
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• pp.71-102
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• 1984

In Korea, the importance of keeping the see transportation facilities and well-trained maritime officers cannot be overemphasized, because of her geographical location and the national security in terms of both political and economical situations. In this paper, some points are suggested for the development of the nautical education in Korea Maritime University: (1) the strict regimental training should be kept as a vital important part of students life and its program should be designed to provide students with leadership training and experience, and to develope in the qualities of responsibilities for good citizenship and self-discipline to overcome hardwork for careers as leaders in Korea maritime industry. And therefore the dormitory and training vessel as essential parts of the educational facilities should be improved both in quality and quantity, (2) the undergraduate course should be extended to more than 5 years so that accredited baccalaureate curriculum and licensing professional education might be well conducted to meet the requirements to cope with the international competition in the facet of seafarers quality, (3) more enlarging the opportunities of incentive payments for students is required so that better qualified applicants can be admitted, (4) finally, a conjugal maritime officer service system should be put into practice in the foresseable furture so that seafarers might live normal family lives while staying at sea.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.408-409
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• 2007

Ferrule function have connect Optical Communication Cable. But Ferrule have important role that is decided transmission efficiency and information quality. Key-point of detailed drawing of ferrule is Anti-Reflection. In the study Broadband Anti-Reflection coating Film was design for ferrule of optical connector and deposited in low temperature by Ion-Assisted Deposition system. Optical thin film materials($Ta_2O_5$, $SiO_2$) were manufactured Index and Film thickness. $Ta_2O_5$ index is 2.123 ~ 2.125 and $SiO_2$ is 1.44 ~ 1.442. Reflection Loss of film deposited on Ferrule is 30.1[dB].

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2007년도 하계학술대회 논문집 Vol.8
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• pp.424-425
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• 2007

Anti-Reflection and High-reflection coating on the facet of semiconductor laser diode. To prevent internal feedback from both facets for realizing super luminescent diode and reducing the reflection-induced intensity noise of laser diode. Anti-Reflection coating Film was designed by Macleod Simulator. Coating Materials were decided $Ti_3O_5$ and $SiO_2$. Thickness of Coating layer $Ti_3O_5/SiO_2$ were 105[nm], 165[nm]. In the study Anti-Reflection coating Film was design for Laser diode and deposited by Ion-Assisted Deposition system. Then manufactured thin film measured electrical properties(L-I-V, Se, Resistor) and Optical properties(wavelength FFP). Slop-efficiency and FFP characteristic is 0.302[W/A], $22.3^{\circ}$(Horizontal), $24.4^{\circ}$(Vertical).

• 마이크로전자및패키징학회지
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• 제17권4호
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• pp.73-76
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• 2010

A two-facet approach was used to investigate the parametric performance of functional high-speed DDR3 (Double Data Rate) DRAM (Dynamic Random Access Memory) die placed in different types of BGA (Ball Grid Array) packages: wire-bonded BGA (FBGA, Fine Ball Grid Array), flip-chip (FCBGA) and lead-bonded $microBGA^{(R)}$. In the first section, packaged live DDR3 die were tested using automatic test equipment using high-resolution shmoo plots. It was found that the best timing and voltage margin was obtained using the lead-bonded microBGA, followed by the wire-bonded FBGA with the FCBGA exhibiting the worst performance of the three types tested. In particular the flip-chip packaged devices exhibited reduced operating voltage margin. In the second part of this work a test system was designed and constructed to mimic the electrical environment of the data bus in a PC's CPU-Memory subsystem that used a single DIMM (Dual In Line Memory Module) socket in point-to-point and point-to-two-point configurations. The emulation system was used to examine signal integrity for system-level operation at speeds in excess of 6 Gb/pin/sec in order to assess the frequency extensibility of the signal-carrying path of the microBGA considered for future high-speed DRAM packaging. The analyzed signal path was driven from either end of the data bus by a GaAs laser driver capable of operation beyond 10 GHz. Eye diagrams were measured using a high speed sampling oscilloscope with a pulse generator providing a pseudo-random bit sequence stimulus for the laser drivers. The memory controller was emulated using a circuit implemented on a BGA interposer employing the laser driver while the active DRAM was modeled using the same type of laser driver mounted to the DIMM module. A custom silicon loading die was designed and fabricated and placed into the microBGA packages that were attached to an instrumented DIMM module. It was found that 6.6 Gb/sec/pin operation appears feasible in both point to point and point to two point configurations when the input capacitance is limited to 2pF.

• 한국비블리아학회지
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• 제28권3호
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• pp.125-150
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• 2017

본 연구는 국내 재난 안전 유관기관들이 사용하고 있는 재난안전정보 관련 분류체계의 현황 및 문제점을 파악하여 일원화된 재난안전정보 분류체계의 구축을 위한 기본 요구사항을 도출하는 것을 목적으로 한다. 이를 위하여 먼저 국내외 재난유형 분류체계를 살펴보았으며, 현재 국내 재난 유관기관에서 사용하고 있는 분류체계를 수집하여 분석하고, 실무자와의 면담을 진행하였다. 분석 결과, 향후 재난유형 분류체계 개발을 위하여 일관성, 망라성, 체계성, 및 한국형 재난에 대한 고려가 필요하다. 또한 재난안전정보 분류체계 개발을 위해서는 재난 및 안전관리 업무의 복잡성, 복합재난의 출현 등을 고려하여 패싯 분류체계의 적용을 제안하였다.

• 한국비블리아학회지
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• 제31권3호
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• pp.213-234
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• 2020

본 연구는 방송영상기록물을 대상으로 방송영상기록물의 제작에 참여한 저작자를 식별하기 위한 기술항목을 제안하여 방송영상기록물에 대한 저자식별체계 구축의 기반을 마련하는데 주된 목적을 두고 있다. 연구 결과, 방송영상기록물의 저작자 식별을 위해, 이름, 성별, 생년월일, 저자식별체계, 국가, 소속기관, 분야 등 총 7개의 기술항목을 개인, 소속, 역할의 세 가지 범주로 구성하였으며, 이에 대해 2단계에 걸쳐 분류 및 범주화를 진행하였다. 이 구조를 바탕으로 총 10개의 기본 패싯과 14개의 하위 패싯을 구성하여 방송영상기록물 저작자의 식별을 위한 패싯 기반 구조를 구축하였으며, 방송영상기록물 저작자 식별을 위한 기술항목을 제안하였다.