• 전자공학회논문지B
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• 제33B권12호
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• pp.84-94
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• 1996

In this work, a fuzzy petri net model for modeling a general form of fuzzy production system which consists of chaining fuzzy production rules and so requires multistage reasoning process is presented. For the obtained fuzzy petri net model, the net will be transformed into some matrices, and also be systematically led to an algebraic form of a state equation. Since it is fond that the approximate reasoning process in fuzzy systems corresponds to the dynamic behavior of the fuzzy petri net, it is further shown that the multistage reasoning process can be carried out by executing the state equation.

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2001년도 International Conference CALS/EC KOREA
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• pp.177-189
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• 2001

ㆍ RosettaNet is one of the most rapidly expanding XML- based B2B standards aiming at lingua-franca for e-Business. ㆍ RosettaNet delivers PIP/sup TM/-based B2B process standards, dictionaries, and implementation frameworks guaranteeing interoperability among integration solutions. ㆍ RosettaNet is an evolutionary standard featuring need-based expansion, implementation-promoting development methodology, and release model based on collective agreement among members. ㆍ RosettaNet plans to continue to focus the majority of its efforts on vertical supply chain and business model specific e-commerce process standards, with an emphasis on rapid adoption and production implementation in the high technology industry.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1995년도 춘계학술대회논문집
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• pp.224-232
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• 1995

A process is designed by the backward tracing scheme of the rigid-plastic FEm for net-shape shell nosing component without machining after forming. The current process of the shell nosing industry requires cost-consuming machining to produce final product . The backward tracing scheme of the rigid-plastic FEM, a novel method in preform design of metal forming processes , derives a sound preform for net-shape shell nosing product . The current process is simulated to check the metal flow involved informing with a trial preform and its modified preform. It is found that the two preforms are not suitable for net-shape shell nosing product. Finally, a preform is desinged by the backward tracing scheme, which is suitable for net-shape manufacturing of the shell nosing component.

• 대한기계학회논문집A
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• 제20권7호
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• pp.2118-2133
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• 1996

A preform is designed by the backward tracing scheme of the rigid-plastic finite element method(FEM) for net-shape shell nosing components without machining after forming. The current process of the shell nosing requires cost-consuming machining to produce final products. Here, the backward tracing scheme of the rigid-plastic FEM, a novel method for preform design of metal forming processes, derives a sound preform for net-shape shell nosing product. The current process is simulated by the rigid-plastic finite element analysis to check the metal flow involved in the forming with a trial preform and its modified preform. The two preforms are found to be inadequate for net-shape shell nosing product. The first application of the back ward tracing scheme derives a preform producing a not-shape shell nosing product. The first application of the backward tracing scheme derives a preform producing a net-shape product numerically, but it is difficult to be formed economically as a preform. Thus an improved preform is designed by the badkward tracing scheme, which is suitable for net-shape manufacturing of the shell nosing components in view of economy of production and forming characteristics of the product. The preform in the current process and a modified preform are confirmed by a series of experiments and the results give the same deformation with the numerical ones. Finally the newly designed preform by the FEM was experimentally proved to be adequate in obtaining net-shape products.

• 한국전자거래학회지
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• 제3권2호
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• pp.141-160
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• 1998

In order to achieve a successful introduction of CALS, an enterprise model which is a concise description of what an enterprise does is required. The enterprise model mainly consists of a process model and a data model. The process model describes processes that create, change, combine, or destroy the entities within the enterprise. Several process modeling methodologies have been proposed. Each modeling methodology requires its own modeling view point, elements, and syntax. In developing a process model for CALS, these models created at different view points are required to analyze and design a system in a broad view. This paper aims at proposing an integration methodology for a process model. Specifically, IDEF0, IDEF3, and Petri Net are considered to be integrated. An IDEF0 model describing static functions of enterprise is transformed to an IDEF3 model describing behaviour of a system with additional information. Also, the IDEF3 model is transformed to a Petri Net model. These transformations will be automatically accomplished once the additional information for the transformation is provided.

• 한국시뮬레이션학회논문지
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• 제18권4호
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• pp.67-79
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• 2009

자동차 제조 기업은 생산되는 제품 수명 주기가 짧기 때문에, 공정계획 및 라인 변경이 빈번히 일어난다. 따라서 새로운 공정을 계획하는 경우보다 기존 공정계획을 바탕으로 라인의 설비를 재배치하거나, 제어정보를 수정하는 경우가 많다. 하지만 생산라인의 제어 정보를 기술하는 표준 방법론이 없기 때문에 기존 공정의 정보를 해석하고 수정하는데 많은 노력이 요구된다. 따라서 본 논문에서는 자동화 생산라인에서 일반적으로 사용할 수 있는 제어레벨 공정 모델링 방법론(SOS-Net)을 제안하고자 한다. 제안된 방법론은 실제 현장라인과 동일한 Low Level의 정보들을 체계적으로 표현함으로써 모델링 결과가 현업에 직접 사용될 수 있도록 고려하였다. 본 논문에서 제안하는 SOS-Net은 쉽게 작성할 수 있으며, 기존의 High Level 모델링 방법들이 갖는 한계점을 극복하고, 현업에서 사용할 수 있는 FB(Function Block) 제어 코드를 생성하는 것을 목적으로 한다.

• The Korean Journal of Ecology
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• 제26권5호
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• pp.289-296
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• 2003

The ecological process-based approach provides a detailed assessment of belowground compartment as one of the major compartment of carbon balance. Carbon net balance (NEP: net ecosystem production) in forest ecosystems by ecological process-based approach is determined by the balance between net primary production (NPP) of vegetation and heterotrophic respiration (HR) of soil (NEP=NPP-HR). Respiration due to soil heterotrophs is the difference between total soil respiration (SR) and root respiration (RR) (HR=SR-RR, NEP=NPP-(SR-RR)). If NEP is positive, it is a sink of carbon. This study assessed the forest carbon balance by ecological process-based approach included belowground compartment intensively. The case study in the Takayama Station, cool-temperate deciduous broad-leaved forest was reported. From the result, NEP was estimated approximately 1.2 t C $ha^{-1} yr^{-1}$ in 1996. Therefore, the study area as a whole was estimated to act as a sink of carbon. According to flux tower result, the net uptake rate of carbon was 1.1 t C $ha^{-1} yr^{-1}$.

• 한국환경과학회지
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• 제12권7호
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• pp.745-751
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• 2003

The three-dimensional eco-hydrodynamic model was applied to estimate the physical process in terms of nutrients and net uptake(or regeneration) rate of nutrients in Kamak Bay for scenario analysis to find proper management plan. The estimation results of the physical process in terms of nutrients shelved that transportation of nutrients is dominant in surface level while accumulation of nutrients is dominant in bottom level. In the case of dissolved inorganic nitrogen, the results showed that the net uptake rate was 0∼60 mg/㎡/day in surface level(0∼3m), and the net regeneration rate was 0.0∼10.0 mg/㎡/day in middle level(3∼6m) and above 10mg/㎡/day in bottom level(6m∼below). In the case of dissolved inorganic phosphorus, the net uptake rate was 0.0∼3.0 mg/㎡/day in surface level, and the net regeneration rate was 0.5∼1.5 mg/㎡/day in middle level and 1.0∼3.0 mg/㎡/day in bottom level. These results indicates that net uptake and transport of nutrients are occurred predominantly at the surface level and the net generation and accumulation are dominant at bottom level. Therefore, it is important to consider the re-supplement of nutrients due to regeneration of bottom water.

• 정보처리학회논문지D
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• 제10D권3호
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• pp.471-488
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• 2003

최근의 대부분의 정보시스템은 웹 기반 정보시스템이며 이의 개발과 유지보수시에 “웹 위기” 현상이 발생하고 있다 이를 해결하기 위해, 웹 엔지니어링 기술 중 웹 기반 비즈니스 프로세스로의 리엔지니어링 기술이 필요하다. 본 논문에서는 웹 기반 정보시스템으로의 이주와 웹 기반 비즈니스 프로세스 모형화를 위한, BPN(Business Process Net) 모형과 이를 이용한 리엔지니어링 휴리스틱스를 적용 예와 함께 제시한다. BPN모형은 베타분포형 확률 패트리넷이며 수행가능형 Activity diagram이라 할 수 있다. BPN을 모형화 할 때, Use Case 분석을 이용하며 비즈니스 프로세스의 수행시간 및 비용적 불확실성은 베타분포를 이용하고 있다. BPN 모형은 XML 기반의 비즈니스 프로세스의 명세언어를 위한 공통 명세모형으로 이용될 수 있으며, 제시한 리엔지니어링 방법 및 지침은 웹 기반 정보시스템의 분석 및 설계단계에서 적용할 수 있다.

• 소성∙가공
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• 제18권8호
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• pp.589-595
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• 2009

The hot forming process of an exhaust CAM for vessel engine was designed by finite element(FE) simulation and experimental analysis. An aim of process design was to achieve the near-net shaped CAM forgings by hot forging process. Based on the compression test results of the low alloy steel, power dissipation map was generated using the the dynamic materials model(DMM). From the map, the initial heating temperature was determined as 1200oC. FE analysis was simulated to predict the formation of forging defects and deformed shape with different forging designs. Optimum process design suggested in this work was made by comparing with the CAM for vessel engine manufactured by actual forging process.