• Title, Summary, Keyword: HAL

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Glass powder첨가에 따른 광전효율의 향상 효과

  • Li, Hu;Park, Gyeong-Hui;Gu, Hal-Bon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.355-355
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    • 2007
  • 염료감응형 태양전지(Dye-sensitized Solar Cell; DSSC)의 에너지 변환효율을 높이기 위해 유리분말을 첨가하여 빛의 분산특성 및 빛의 이용률을 높이고 있지 알아보자고 실험을 하였다. 저온소성용, 고온소성용 두 가지 유리 분말을 각각 첨가한 경우 TiO2 광전극 박막표면에 유리분말의 잔류로 인한 영향을 X-RD로 분석 하였고 박막의 입자들의 형상변화와 분포를 알아보기 위해 FE-SEM으로 관찰하였으며 유리분말의 첨가량 별 광전류-전압 곡선으로부터 최적의 첨가량을 확인하였다.

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100km 행군을 즐겁게 하기 위한 보행보조용 외골격기구의 개발

  • Kim, Cheol-Ung
    • Journal of the KSME
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    • v.50 no.12
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    • pp.50-55
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    • 2010
  • 영화 로보캅, 아이언맨 등에 등장하는 외골격기구(exoskeleton)는 이제 더 이상 먼 미래의 얘기도 아니고 딴 나라 얘기도 아니다. 외골격기구 중 특히 하지외골격기구는 Baytheon Sarcos, Berkley Bionics, Exohiker, Bleex, HAL5 등의 이름으로 버클리, 스탠퍼드 등 해외 우수 연구집단에서 이미 개발을 성공하였고 상용화를 앞두고 있다. 늦은 감은 있지만 국내에서도 재활의료용, 군수용 하지외골격기구 연구가 진행되고 있다. 본 저자는 최근 기존연구와 다른 접근방식으로 고민을 시작하였고 본 연구팀이 상표출원한 $PLE^{TM}$, $LeSATA^{TM}$의 개발을 서두르고 있다. 이 글을 통해 그간의 고민들을 간략히 털어놓을까 한다.

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MBO-Tree: A Hierarchical Representation Scheme for Shapes with Natural Approximation and Effective Localization (MBO-Tree: 형상의 자연스러운 근사화와 효과적인 지역화를 지원하는 계층적 표현 방법)

  • 허봉식;김동규;김민환
    • Journal of Korea Multimedia Society
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    • v.5 no.1
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    • pp.18-27
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    • 2002
  • A hierarchical representation scheme for planar curves, MBO-tree, is proposed in this paper, which provides natural approximation and efficient localization. MBO-tree is based on the Douglas-Peucker algorithm (iterative end-point fit algorithm), but approximation errors that are stored with corresponding points in MBO-tree nodes and are used for abstraction measures are adjusted by force to eliminate unnatural approximation. The error adjusting is just making the approximation error of a node in a MBO-tree to be less than or equal to that of its parent. In point of localization, the bounding area of a curve is represented with a minimum bounding octangle (MBO), which can enclose the curve more compactly compared with those of other hierarchical schemes, such as the strip tree, the arc tree and the HAL tree. The MBO satisfies the hierarchical inclusion property that is useful for hierarchical geometrical operations, such as the point-inclusion test and the polygon intersection test. Through several experiments, we found that the proposed scheme was able to approximate more naturally and to localize more effectively.

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An Interlace Test Tool Based on an Emulator for Improving Embedded Software Testing (임베디드 소프트웨어 테스트를 개선하기 위한 에뮬레이터 기반 인터페이스 테스트 도구)

  • Seo, Joo-Young;Choi, Byoung-Ju
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.6
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    • pp.547-558
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    • 2008
  • Embedded system is tightly coupled with heterogeneous layers such as application, as kernel, device driver, HAL and hardware. Embedded system is customized for the specific purpose and hardware. In addition, the product cycle is so fast that software and hardware, which are developed by several vendors, are integrated together under unstable status. Therefore, there are lots of possibilities of faults in all layers. Because embedded software developers test their codes integrated with faulty layers, they cannot confirm 'whether testing of every aspects was completed, their code was failed, or integrated software/hardware has some problems'. In this paper, we propose an embedded software interface test method and a test tool called Justitia for detecting faults and tracing causes in the interface among heterogeneous layers. The proposed technique is an automated method which improves debugging upto professional testing using an emulator for helping developer.

Implementation of IEEE 802.15.4a Software Stack for Ranging Accuracy Based on SDS-TWR (SDS-TWR 기반의 거리측정 정확도를 위한 IEEE 802.15.4a 소프트웨어 스택 구현)

  • Yoo, Joonhyuk;Kim, Hiecheol
    • Journal of the Korea Industrial Information Systems Research
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    • v.18 no.6
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    • pp.17-24
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    • 2013
  • The localization accuracy in wireless sensor networks using ranging-based localization algorithms is greatly influenced by the ranging accuracy. Software implementation of HAL(Hardware Abstraction Layer) and MAC(Medium Access Layer) should seamlessly deliver the raw performance of ranging-based localization provided by hardware capability fully to the applications without degrading the raw performance. This paper presents the design and implementation of the software stack for IEEE 802.15.4a which supports normal ranging mode of the Nanotron's NA5TR1 RF chip. The experiment results shows that average ranging error rate with our implementation is 24.5% for the normal mode of the SDS-TWR ranging scheme.

Emitting characteristics of poly(3-octylthiophene) electroluminescent devices (Poly(3-octylthiophene) 전계발광소자의 발광특성)

  • Seo, Bu-Wan;Kim, Ju-Seung;Gu, Hal-Bon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.131-134
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    • 2000
  • Electroluminescent[EL] from conjugated polymers has recently received great attention because polymer light-emitting diodes[LEDs] clearly have potential for applications such as large-area displays. The operation of polymer LEDs is based on double injection of electrons and holes from the electrodes, followed by formation of excitons whose radiative decay results in light emission at wavelength characteristic to the material In this paper, we fabricated the single layer EL device using poly(3-octylthiophene)[P3OT] as emitting material. The orange-red light was clearly visible in a dark room Maximum peak wavelength of EL spectrum saw at 640nm in accordance with photon energy 1.9eV. And we know that ionization energy of P3OT is 4.7eV from the cyclic voltammetry.

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Enhancement of Emission Efficiency of Multilayer White Light Organic Electroluminescent Device (다층구조를 적용한 백색 전계발광소자의 발광효율 향상)

  • Kim, Ju-Seung;Gu, Hal-Bon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.27-31
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    • 2001
  • We fabricated organic electroluminescent(EL) devices with mixed emitting layer of poly(N-vinylcarbazole)(PVK), 2,5-bis(5'-tert-butyl-2-benzoxazoly)thiophene(BBOT), N,N'-diphenyl-N,N'-(3-methyphenyl)-1,1'-biphenyl-4, 4'-diarnine(TPD) and poly(3-hexylthiophene)(P3HT). To improve the external quantum efficiency of EL devices, we added the functional layer to the devices such as LiF insulating layer, carrier confinement layer(BBOT) and hole injection layer(CuPc). In the ITO/emitting layer/Al device, the maximum quantum efficiency at 15V was $1.88{\times}10^{-5}%$. And then, it is increased by a factor of 27 to $5.2{\times}10^{-3}%$ in ITO/CuPc/emitting layer/BBOT/LiF/Al device at 15V.

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Emitting characteristics with alkyl side chain introduced at poly(3-alkylthiophene) electroluminescent devices (Poly(3-alkylthiophene) 전계발광소자에 도입된 alkyl side chain의 길이에 따른 발광특성)

  • Seo, Bu-Wan;Kim, Ju-Seung;Gu, Hal-Bon
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.143-146
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    • 2000
  • We studied effects of alkyl($C_nH_{2n+1}$) chain length on characteristics of poly(3-alkylthiophene) electroluminescent diodes. Among the poly(3-alkylthiophene), poly(3-hexylthiophene)(n=6) and poly(3- octyIthiophene)(n=8) were mainly used for the emitting layer of the diode. The result of experiment, the emission intensity of poly(3-alkylthiophene) electroluminescent diodes depends on the alkyl chain length. Strong emission is obtained from a poly(3-alkylthiophene) diodes of long alkyl side chain length. Emission intensities are enhanced by a confinement of carriers on a main chain with a long interchain distance caused by a long alkyl side chain.

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