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A METHOD ON AUTOMATIC TRANSLATION OF SEQUENTIAL PROGRAMS INTO DATA FLOW PROGRAMS
朴斗淳,黃鐘善,白斗權 순천향대학교 1987 논문집 Vol.10 No.3
기존의 Von Neumann Model 방식의 Sequential Program을 Speed-up 시키는 방법들이 연구되어왔다. 이는 Von Neumann Model방식의 Uni-processor를 사용해서 program을 execution시키는 speed-up에 한계가 있다는 것이다. 그래서 sequential program을 speed-up execution 시키기 위해서 multi-processor를 도입하였고 multi-processor에서는 program을 execution 시키는데 parallel processing을 해야만 execution time을 speed-up시킬 수 있다. 이런 parallel processing에 근거를 두고 개발 된 system 이 data flow system이다. 그러나 기존의 Von Neumann 방식의 sequential program은 data flow system에서 직접 execution 시킬 수 없다. 그러므로 기존의 sequential program을 data flow execution 시키기 위한 automatic translation 방법을 도입하였다. 이를 위하여 본 paper에서는 dependency testing algorithm 과 automatic translation algorithm을 도입하였고, 이를 이용하여 sequential program을 data flow program으로 automatic 하게 translation하였다.
형식 도구를 이용한 이산사건 시뮬레이션의 모델 형식화 방법론
정영식,황종선,백두권 한국경영과학회 1992 韓國經營科學會誌 Vol.17 No.3
The DEVS(Discrete EVent system Specification) formal model for discrete event simulation is a hierarchical, modular model. Because the DEVS formal model has a mathematical structure, is provides a theoretic background of discrete event simulation model. However, the DEVS formal model is difficult to understand because of its mathematical structure. Also, since the DEVS formal model is often constructed by heuristic, subjective method of model designer from the informal model, a systematic model built-in methodology does not exist. In this paper, we propose the model formalization methodology from an informal model to the DEVS formal model. For this formalization methodology, we introduce formal tools for model construction based on the DEVS from an informal model : Event Dependency Graph (EDG) for the event analysis and State Representation Graph (SRG) for the system state analysis.
知能的 컴퓨터 補助敎育을 위한 ERIC 시스템 具現에 관한 硏究
정영식,황종선,김창화,인 호,백두권 강릉대학교동해안지역연구소 1990 東海岸硏究 Vol.1 No.2
ICAI시스템은 일반적으로 전문가 모듈, 교사 모듈, 학생모델 모듈 및 인터페이스 모듈의 4가지 構成要素로 구성된다. 本 硏究에서는 4가지 모듈중에서 전문가 모듈과 교사 모듈의 機能을 遂行하도록 하기 위한 지식베이스를 構築하였다. 먼저 必要한 지식베이스들을 分類하고 지식베이스를 構築하기 위한 接近方法들을 硏究하였다. 構築된 지식베이스는 코스웨어 자체에 修正을 가하지 않고 학습전략(learning strategy)을 다양하게 하기 위해서 Domain Knowledge와 Control Knowledge로 分離하였고 Domain Knowledge는 EA모델을 통하여 코스웨어를 構築하였으며, Control Knowledge는 規則基盤(rule-based)을 利用하여 學習進行 및 評價에 필요한 知識들을 構築하였다. 이를 基礎로 하여 ERIC시스템을 設計, 具現하였다. ICAI system consists of the four modules, i.e., expert module, tutor module, student model module and interface module. This paper shows the knowledge base construction to perform the functions of expert module and tutor module of the four modules. At first we identified the essential knowledge bases in ICAI system and researched the approach for the knowledge base construction. The constructed knowledge base was divide into the domain knowledge and the control knowledge to perform the several learning strategies without the courseware modification. The domain knowledge constructed by EA model represents the courseware contents and the rule-based control knowledge represents the information necessary to perform the learning process and student estimation. Based on these methodogies, we designed and implemented ERIC system.
MAO모델을 사용한 관계 데이타베이스의 논리적 설계방법론
조동영,백두권,황종선 한국경영과학회 1991 韓國經營科學會誌 Vol.16 No.2
In this paper, we present a stepwise design methodology for relational databases using a new conceptual data model, the MAO(Multiple Aspects-based Object.) model. Our methodology consists two steps: first, data requirements are conceptualized the MAO model form in the relational model supported by transformation DBMSs. A top-down approach is used for the MAO modeling in the first step, and more accurate database design of real world than other methodologies supports easier and more database design of real world than other methodologies using existing data models.
Hwang, Sun-Mi,Park, Jae-Hyun,Lim, Seongyop,Jung, Doo-Hwan,Guim, Hwanuk,Yoon, Young-Gi,Yim, Sung-Dae,Kim, Tae-Young RSC Pub 2014 Nanoscale Vol.6 No.20
<P>A critical issue for maintaining long-term applications of polymer electrolyte fuel cells (PEFCs) is the development of an innovative technique for the functionalization of a carbon support that preserves their exceptional electrical conductivity and robustly enriches their durability. Here, we report for the first time how the formation of a partially coated, ultrathin, hydrophobic silica layer around the surfaces of the carbon nanofiber (CNF) helps improve the durability of the CNF without decreasing the significant electrical conductivity of the virgin CNF. The synthesis involved the adsorption of polycarbomethylsilane (PS) on the CNF's sidewalls, followed by high temperature pyrolysis of PS, resulting in a highly durable, conductive carbon support in PEFCs. The Pt nanoparticles are in direct contact with the surface of the carbon in the empty spaces between unevenly coated silica layers, which are not deposited directly onto the silica layer. The presence of a Pt nanoparticle layer that was thicker than the silica layer would be a quite advantageous circumstance that provides contact with other neighboring CNFs without having a significant adverse effect that deeply damages the electrical conductivity of the neighboring CNF composites with the silica layer. Furthermore, the ultrathin, hydrophobic silica layer around the surfaces of the CNF provides great potential to reduce the presence of water molecules in the vicinity of the carbon supports and the OH radicals formed on the surface of the Pt catalyst. As a result, the CNF with a 5 wt% silica layer that we prepared has had extremely high initial performance and durability under severe carbon corrosion conditions, starting up with 974 mA cm(-2) at 0.6 V and ending up with more than 58% of the initial performance (i.e., 569 mA cm(-2) at 0.6 V) after a 1.6 V holding test for 6 h. The beginning-of-life and end-of-life performances based on the virgin CNF without the silica layer were 981 and 340 mA cm(-2) at 0.6 V, respectively. The CNF having a silica layer had long-term durability which was superior to that of the virgin CNF.</P>
Hwang, In-Sung,Choi, Joong-Ki,Woo, Hyung-Sik,Kim, Sun-Jung,Jung, Se-Yeon,Seong, Tae-Yeon,Kim, Il-Doo,Lee, Jong-Heun American Chemical Society 2011 ACS APPLIED MATERIALS & INTERFACES Vol.3 No.8
<P>The effect of Ag decoration on the gas sensing characteristics of SnO<SUB>2</SUB> nanowire (NW) networks was investigated. The Ag layers with thicknesses of 5–50 nm were uniformly coated on the surface of SnO<SUB>2</SUB> NWs via e-beam evaporation, which were converted into isolated or continuous configurations of Ag islands by heat treatment at 450 °C for 2 h. The SnO<SUB>2</SUB> NWs decorated by isolated Ag nano-islands displayed a 3.7-fold enhancement in gas response to 100 ppm C<SUB>2</SUB>H<SUB>5</SUB>OH at 450 °C compared to pristine SnO<SUB>2</SUB> NWs. In contrast, as the Ag decoration layers became continuous, the response to C<SUB>2</SUB>H<SUB>5</SUB>OH decreased significantly. The enhancement and deterioration of the C<SUB>2</SUB>H<SUB>5</SUB>OH sensing characteristics by the introduction of the Ag decoration layer were strongly governed by the morphological configurations of the Ag catalysts on SnO<SUB>2</SUB> NWs and their sensitization mechanism.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2011/aamick.2011.3.issue-8/am200647f/production/images/medium/am-2011-00647f_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am200647f'>ACS Electronic Supporting Info</A></P>