• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1996년도 International Conference on Agricultural Machinery Engineering Proceedings
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• pp.918-925
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• 1996

The effect of structured water by dissolution of xenon was examined from the view point of the suppression of both browning and respiratory metabolism of broccoli. The structured water is formed duet to hydrophobic interaction when xenon gas dissolves into water. NMR measurements were carried out to determine proton spin-spin relaxation time, T2, for water. There was a difference in proton T2 between distilled water and structured water. This can be interpreted as the change of water structure. Fro the broccoli cut in half stored for 16 days at 279K, the section color did not change appreciably for the sample whose water was structured by dissolution of xenon whose initial partial pressure was 0.39MPa. In contrast to this, the browning of section surface was observed for the sample stored under the condition of nitrogen gas at the same partial pressure as xenon and for the sample stored under atmospheric condition . These results led to the conclusion that the suppression of b owning by oxidation was due to structured water but not to applied pressure. Adding to this, the water structured by xenon has resulted in suppression of respiratory metabolism of broccoli.

• 대한화장품학회지
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• 제22권2호
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• pp.167-173
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• 1996

The stability of gel structured emulsion and the effect of polyols on it have been studied by rheological property and interfacial tension. In this paper, three types of gel structured emulsions were prepared by using three polyols respectively(glycerine for sample 1, 1.3 BG for sample 2, PG for sample 3). And both complex modulus($G^*$) and loss angle[$\delta$ = tan-1(G"/G')] of samples were investigated against oscillating shear stress and frequency($\omega$). The results show sample 1 is most highly consistent with oscillating shear stress. And the results were compared with those of accelerated tests concerning storage stability of gel structured emulsion. To correlate consistency of rheological property with storage stability, interfacial tension from which adsorption efficiency of surfactant(Octyldodecyl Ether) could be known was measured. Sample 1 showed the largest value of [$d{\gamma}/dIn_{Cconc. of surfactant}$] in Gibbs equation. In summary, the prediction of stability could be correctly made by the consistency of rheological property(G*,$\gamma$) of gel structured emulsion against oscillating shear stress and it could be supported by measuring interfacial tension. And polyol affected the value of [$d{\gamma}/dIn_{Cconc. of surfactant}$], consequently affected the stability.lity.

• 정보학연구
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• 제2권2호
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• pp.269-279
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• 1999

정보화 사회에서 많은 문서가 전자화 됨에 따라 효율적인 처리를 위해 구조화된 전자 문서 처리가 요구되고 있다. 이에 SGML은 구조화된 정보를 생성하고 교환하기 위한 문서 표준으로써, 이러한 전자 문서를 보여주고 수정하며 새로운 문서를 생성하기에 알맞다. 이에 따라 대량의 구조화된 SGML 문서 정보의 저장, 관리에 관한 연구가 필요하다. 본 논문은 HyTime(Hypermedia Time-based Structuring Language)에서 정의된 GROVE(Graph Representation Of property ValuEs)를 이용하여 데이터 모델링 설계 및 SGML 문서 저장 관리 시스템 설계에 대해 기술한다.

• 로봇학회논문지
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• 제4권2호
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• pp.147-154
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• 2009

Visions of ubiquitous robotics and ambient intelligence involve distributing information, knowledge, computation over a wide range of servers and data storage devices located all over the world, and integrating tiny microprocessors, actuators, and sensors into everyday objects as well in order to make them smart. In this paper, we introduce our ongoing research effort aimed at realizing ubiquitous robots in an information structured space. For this, a ubiquitous space and ambient intelligent systems for a librarian robot are introduced and the RFID technology based approach for these systems is described.

• 한국경영과학회지
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• 제15권2호
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• pp.85-95
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• 1990

Structured modeling provides a formal mathematical framework, language, and computer-based environment for conceiving, representing, and manipulating a wide variety of model. It provides a natural framework for integrated modeling owing to its explicit representation power for computational dependencies among submodles. Nevertheless, it doesn't seem to offer a systematic way of composing a structured model from submodels. In order to develop a systematic way, this paper discusses three key issues : (1) Genus structure for model composition, (2) Storage of structured models, and (3) Integration of structured models. To formalize and visualize the approach, a programming module is developed to implemented the step-by-step integration.

• 반도체디스플레이기술학회지
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• 제8권1호
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• pp.13-17
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• 2009

In PRAM applications, the devices can be made for both binary and multi-state storage. The ability to attain intermediate stages comes either from the fact that some chalcogenide materials can exist in configurations that range from completely amorphous to completely crystalline or from designing device structure such a way that mimics multiple phase chase phenomena in single cell. We have designed stack-structured phase change memory cell which operates as multi-state storage. Amorphous $Ge_xTe_{100-x}$ chalcogenide materials were stacked and a diffusion barrier was chosen for each stack layers. The device is operated by crystallizing each chalcogenide material as sequential manner from the bottom layer to the top layer. The amplitude of current pulse and the duration of pulse width was fixed and number of pulses were controlled to change overall resistance of the phase change memory cell. To optimize operational performance the thickness of each chalcogenide was controlled based on simulation results.

• 정보처리학회논문지D
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• 제9D권6호
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• pp.1025-1042
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• 2002

본 논문은 정보검색을 위한 용어들 간에 존재하는 관련정보인 시소러스를 이용하여 정보 검색 시스템의 검색 성능을 향상시키기 위한 구조적 문서를 생성하고 이를 검색하는 검색 기법에 대하여 연구하였다. 이를 위해 시소러스를 이용한 구조적 문서의 탐색을 위한 깊이중심분할 색인(DODI : Depth-Oriented Decomposition Index) 기법을 제안하였으며, 또한 시소러를 이용한 색인 기법으로서 효과적인 정보 검색이 가능하도록 검색 알고리즘을 통해 연관관계의 정보들에 대한 검색이 가능하도록 하였다. 또한 색인기법에 의해 생성된 구조적 문서는 OpenXML을 통해 데이터베이스 내에 저장되고, ForXML 메소드를 이용하여 재구성된 XML문서를 생성하도록 구조적 문서 저장 시스템을 구현하였다.

• 정보처리학회논문지C
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• 제12C권4호
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• pp.603-608
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• 2005

웹 프락시 서버에서 디스크 I/O는 병목현상을 일으키는 주요 요소이다. 오늘날 대부분의 웹 프락시 서버는 범용 파일 시스템에서 실행되도록 설계되어 있다. 그러나 범용 파일 시스템은 웹 캐시 워크로드에서 대부분 차지하는 작은 파일들을 효과적으로 처리하지 못하기 때문에 전체 웹 프락시 서버의 성능을 저하시키게 한다. 본 논문에서는 범용 파일 시스템을 사용하지 않는 원시(raw) 디스크 I/O 기법이 웹 프락시 서버의 디스크 I/O 오버헤드 개선에 얼마나 영향을 미치는지 그 성능 잠재력을 평가한다. 이를 위해 웹 프락시 서버를 위한 저장관리 시스템인 BSMS(Block-structured Storage Management System)를 설계하고 Squid 소스에 적용시켜 웹 프락시 서버를 구현하였다. 다양한 실험 평가를 통해 원시 디스크 I/O 기법이 웹 프락시 서버에서 디스크 I/O의 성능을 크게 개선시키는 좋은 방법임을 보였다.

• 한국환경복원기술학회지
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• 제16권1호
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• pp.181-191
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• 2013

The design process of ecological and environmental detention system located in the housing district of Sinjeong 3-jigu in Seoul are as follows. At stage one, a new dispersal detention was created in the neighborhood park located near the originally planned detention. From this, the amount of storage of this dispersal detention system was enlarged from $28,337m^3/d$, the initial storage amount, to $33,606m^3/d$ as the post storage amount, responsible to the amount of rainfall which happens every 100 years. In particular, the SSB (Sustainable Structured wetland Biotop) system, which was the New Excellent Technology verified by the Ministry of Environment (No. 258) was applied to enhance ecological functioning and water quality with the detention as a constructed wetland. At stage two, the treatment plans for non-point pollutant source occurred at the initial period of rain, flowing into the detention system were built for purifying the water of the retention pond at the base of the detentions, and the water-circulation system was designed at the dispersal detentions on the period of regular rainfalls. The non-point pollutant source flowing into detention site was calculated as $11,699m^3/d$ flowing down from seven small watersheds, which occurred at the initial period of rain. In particular the SSB systems improved the average efficiency of the water processing performance to BOD 60%, SS 90%, T-N 30%, T-P 60%. At stage three, the ecological network and biological diversity were strongly considered so that it brought the residents with amenity places. In particular, the dispersal detentions were successfully designed to restore the ecological habitat of endangered plant and animal species such as narrow-mouthed.

• Journal of Mechanical Science and Technology
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• 제15권1호
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• pp.125-138
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• 2001

An efficient correction storage scheme on a structured grid is applied to a sequence of approximate Jacobian systems arising at each time step from a linearization of the discrete nonlenear system of equations, obtained by the implicit time discretization of the conservation laws for unsteady fluid flows. The contribution of freezing the Jacobian matrix to computing costs is investigated within the correction storage scheme. The performance of the procedure is exhibited by measuring CPU time required to obtain a fully developed laminar vortex shedding flow past a circular cylinder, and is compared with that of a collective iterative method on a single grid. In addition, some computed results of the flow are presented in terms of some functionals along with measured data. The computational test shows that the computing costs may be saved in favor of the correction storage scheme with the frozen Jacobian matrix, to a great extent.