• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1510-1514
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• 2010

강변저류지는 홍수터, 하천연안 저지대 농경지 등을 이용하여 기존 제방의 일부 구간에 취수부를 설치하고 계획홍수 초과 또는 일정 수위 이상 발생 시 이를 일시 저류함으로써 하류의 홍수량을 경감시키는 소규모 수공구조물이다. 이러한 강변저류지와 같은 소규모 수공구조물의 홍수조절효과에 가장 큰 영향을 미치는 인자로는 저류용량이 있으나, off-line 형식을 강변저류지에 적용할 경우 저류용량 이외에도, 취수부의 형식(월류제, 수문)과 취수부의 제원(월류고, 월류폭 등)은 강변저류지의 홍수조절효과에 큰 영향을 미친다. 본 연구에서는 저류용량변화에 따른 홍수조절효과 변화에 초점을 맞춰 수행된 기존의 연구들과 달리, 취수부형식과 취수부 제원 변화에 따른 강변저류지의 홍수조절효과 개선방안을 제시하고자 한다.

• KOMUNHWA
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• no.65
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• pp.31-55
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• 2005

Ring type Bit(圓環蠻) is a specific bit that an independent Wonhwan(ring, 圓環) plays the role of the bit stopper. In three-kingdom especially 6th century A.D., It was in fashion throughout the southern part of the Korean Peninsula, The form is various accordi

• LP가스
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• s.88
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• pp.67-69
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• 2003

산업자원부는 그동안 분기별 1회씩 실시해 오던 "사용자 자율점검의 날"이 형식적이라며 "가스안전 총 점검의 날"로 명칭을 바꿔 매월4일을 기해 실시할 계획이라고 밝혔다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10c
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• pp.700-702
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• 2002

본 논문은 16-비트 고정된 명령어 형식을 갖는 32-비트 EISC(Extendable Instruction Set Computer) 코어 구현에 대하여 기술하였다. EISC구조는 코드 밀도가 높은 확장 오퍼랜드(operand) 형식을 사용하여 메모리 크기를 줄일 수 있으므로 ASIC 구현시 저전력 시스템 및 소형화된 임베디드 시스템을 위한 프로세서 구현을 가능하게 한다. 설계된 프로세서는 AE32000 명령어 셋과 호환이 가능하도록 설계되었으며 5단 파이프라인을 적용하여 프로세서의 성능을 높였다. 또한 BTB(Branch Target Buffer)를 사용하여 분기 지연을 줄여 낮은 CPI(Clock Per Instruction)을 유지하게 하였다.

• Journal of KIISE:Databases
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• v.32 no.6
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• pp.603-615
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• 2005

As recent business environments are changed and become complex, a more efficient and effective business process management are needed. This paper proposes a new approach to the automatic execution of business processes using Event-Condition-Action (ECA) rules that can be automatically triggered by an active database. First of all, we propose the concept of blocks that can classify process flows into several patterns. A block is a minimal unit that can specify the behaviors represented in a process model. An algorithm is developed to detect blocks from a process definition network and transform it into a hierarchical tree model. The behaviors in each block type are modeled using ACTA formalism. This provides a theoretical basis from which ECA rules are identified. The proposed ECA rule-based approach shows that it is possible to execute the workflow using the active capability of database without users' intervention.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.38 no.9
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• pp.789-795
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• 2014

In this study, the distribution characteristics of diffusers with various shapes that are installed in an open-type thermal storage system are numerically investigated. Four diffusers are designed to distribute a working fluid evenly through the holes on bifurcated pipes. Three-dimensional steady simulations of incompressible laminar flow are conducted using commercial software (ANSYS-FLUENT). The simulation results show that both the bidirectional header-type diffuser and the H-type diffuser distribute the working fluid evenly whereas both the unidirectional and the bidirectional diffusers distribute the working fluid unevenly. The results also show that the H-type diffuser requires a higher head of pump than the bidirectional header-type diffuser. Therefore, the bidirectional header-type diffuser is recommended for use because it enables even distribution of the working fluid and requires a low head of pump.

• ETRI Journal
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• v.10 no.3
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• pp.9-23
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• 1988

반도체 기술의 급격한 발전으로 마이크로프로세서를 이용하여 수퍼미니급의 컴퓨터를 개발하는 것이 가능하게 되었다. 따라서 프로세서 칩 개발노력이 증대되었으며 컴퓨터 구조 또는 프로세서 구조에 관한 연구도 여러 곳에서 진행되고 있다. 우리나라의 경우 독자적인 명령어를 갖는 컴퓨터를 개발하겠다는 노력은 미미하였으며 외부로 발표된 것은 전무한 상태이다. 본 논문은 한국전자통신연구소에서 개발하고 있는 독자적인 명령어 세트를 가지는 RISC 형태의 32 비트 마이크로프로세서인 HARP의 구조설계에 관한 것으로서 기본구조 설계를 위하여 1980년대 이후에 개발된 RISC 프로세서들에 대한 사례연구를 하였으며, 이를 바탕으로 HARP의 명령어 및 데이터 형식, 레지스터의 구성, 48비트의 가상 어드레스 사용방법, load/store 및 분기 명령어에서 사용되는 어드레싱 모드 그리고 HARP에서 정의한 39개의 명령어들에 대해 기술한다.

• Journal of KIISE:Databases
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• v.32 no.4
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• pp.452-472
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• 2005

We propose XIR-Branching, a novel method for processing partial match queries on heterogeneous XML documents using information retrieval(IR) techniques and novel instance join techniques. A partial match query is defined as the one having the descendent-or-self axis '//' in its path expression. In its general form, a partial match query has branch predicates forming branching paths. The objective of XIR-Branching is to efficiently support this type of queries for large-scale documents of heterogeneous schemas. XIR-Branching has its basis on the conventional schema-level methods using relational tables(e.g., XRel, XParent, XIR-Linear[21]) and significantly improves their efficiency and scalability using two techniques: an inverted index technique and a novel prefix match join. The former supports linear path expressions as the method used in XIR-Linear[21]. The latter supports branching path expressions, and allows for finding the result nodes more efficiently than containment joins used in the conventional methods. XIR-Linear shows the efficiency for linear path expressions, but does not handle branching path expressions. However, we have to handle branching path expressions for querying more in detail and general. The paper presents a novel method for handling branching path expressions. XIR-Branching reduces a candidate set for a query as a schema-level method and then, efficiently finds a final result set by using a novel prefix match join as an instance-level method. We compare the efficiency and scalability of XIR-Branching with those of XRel and XParent using XML documents crawled from the Internet. The results show that XIR-Branching is more efficient than both XRel and XParent by several orders of magnitude for linear path expressions, and by several factors for branching path expressions.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.9 no.6
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• pp.1260-1268
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• 2005

Ladder Diagram(LD) is the most extensively used among PLC standard language for the design of control system. But LD has the disadvantages for data processing and maintenance. On the other hand, the Sequential Function Chart(SFC) graphic language is very powerful for describing the sequential logic control algorithm. SFC is based on flow chart, so control flow understanding is very easy and divergence can possible improving its ability. In this paper, we propose the efficient management elevator system using the action qualifiers and choice divergence. From the result, we confirm the SFC language reduced program memory capacity and processing time is faster than LD language.

• Journal of Biosystems Engineering
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• v.16 no.4
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• pp.384-398
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• 1991

A computer program was developed to select the optimum size of farm machine and analyze its operation costs according to various farming conditions. It was written in FORTRAN 77 and BASIC languages and can be run on any personal computer having Korean Standard Complete Type and Korean Language Code. The program was developed as a user-friendly type so that users can carry out easily the costs analysis for the whole farm work or respective operation in rice production, and for plowing, rotarying and pest controlling in upland. The program can analyze simultaneously three different machines in plowing & rotarying and two machines in transplanting, pest controlling and harvesting operations. The input data are the sizes of arable lands, possible working days and number of laborers during the opimum working period, and custom rates varying depending on regions and individual farming conditions. We can find out the results such as the selected optimum combination farm machines, the overs and shorts of working days relative to the planned working period, capacities of the machines, break-even points by custom rate, fixed costs for a month, and utilization costs in a hectare.