• 산업기술연구
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• 제18권
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• pp.139-148
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• 1998

Traditionally, the problems of manufacturing technology and manufacturing management have been treated independently. In this research, we endeavor to integrate the process planning and scheduling activities as an attempt to integrate the two realms. To draw up a plan of process planning and scheduling in real manufacturing environment is not an easy task because available time to plan could be limited and the shop status could change frequently. So we propose an architecture of integrated process planing and scheduling problem within the allowed time even if sheep situations change rather frequently. We argue that we can obtain a better and practical scheduling solution by dynamically changing the processing machines and operations as the shop condition changes. The proposed system takes the initial information for alternative machines and operations represented by an AND/OR graph as its input. Other informational inputs to the system are part order and shop statues. The system then generates new process plan and schedules during permitted time. Experimental results show that the proposed scheme provides a viable solution for real world scheduling problems.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.311-315
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• 2008

Currently, in automobile industry. the efforts to reduce the manufacturing cost by changing the process of manufacturing are continually performed. In this paper, we proposed a new manufacturing process, the roll bending of a ring plate of automotive fuel tank instead of conventional press blanking process to reduce material loss and manufacturing cost. Finite element analysis was used to optimize the roll bending process to assure rectangular cross-section of the ring plate. Also, spring-back analysis after the roll bending was performed and dimension of the bending die considering spring-back was analyzed. Finally, we verified a possibility for realization of the proposed method shape with prototypes.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2008년도 정기 학술대회
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• pp.446-449
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• 2008

Construction project has been changing a huge size and the complicated, so information of each parties are overflow. For more successful construction, more communications are required. Nowadays, BIM has been used widely to solve the problem. But BIM information is used by attribute parties. Many of parties cannot use BIM information. Therefore, this study's purpose is to develope prototype of BIM usage for tower crane. It will overcome current information dividing.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -1
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• pp.145-148
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• 2002

In a network communication process, cryptographic algorithms play important role for secure process. This paper presents a new system architecture named "DCCS." This system can handle flexible operations of both cryptographic algorithms and the keys. For experimental evaluation, two representative cryptographic algorithms DES and Triple-DES are designed and implemented into an FPGA chip on the SEBSW-1. Then the developed board is confirmed to change its cryptographic algorithms dynamically. Also its throughput confirmed the ability of the real-time net-work use of the designed system.

• 한국경영과학회지
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• 제8권1호
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• pp.31-40
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• 1983

An uncertain dynamic evolving process has been a continuing challenge to decision problems. The dynamic random variable (drv) changes which characterize such a process are very important for the decision-maker in selecting a course of action in a world that is perceived as uncertain, complex, and dynamic. Using this subjective point prediction algorithm based on a modified recursive filter, the decision-maker becomes to have periodically changing plausible points with the passage of time.

• 한국기계가공학회지
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• 제11권3호
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• pp.68-72
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• 2012

Al2017 is typical Duralumin of self-hardening aluminum alloy. It is lightweight, formability and machinability so throughout the industries have widely used automobile, electronics, semiconductor and aircraft as material. A variety of CNC machine tool processing technology, scientific principles and experience have been studied in order to increase accuracy and productivity. Using a machining center is to constant amount of side step and cutting characteristics studied changing depth of cut, revolution per minute and feed rate.

• 기술혁신연구
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• 제9권2호
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• pp.98-119
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• 2001

The purpose of this study is to classify the world countries into several cluste on the basis of the characteristics of the scientific and technological development, and analyse the main factors of development in each cluster. Major contributions of this study can be summarized as follows: (1) In the process of producing the composite indicators, individual indicators were adopted only if they met the condition which were logically compliable for the given time periods. Hence this thesis supports the reliability in comparing results of analysis in each period of years. (2) Could clearly capture the development characteristics and its changing process in each country.

• 산업기술연구
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• 제15권
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• pp.15-22
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• 1995

We have studied the generation and behavior of negative ions in silane plasmas. The negative ions were formed by homogeneous reaction in silane plasma and the behavior of negative ions were predicted by solving the model equations. The concentration profiles of negative ions were shown as a function of reactor length and time. The effects of process variables such as reactor pressure, flow rate and electrical field strengths on the behavior of negative ions were analyzed.

• 한국펄프종이공학회:학술대회논문집
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• 한국펄프종이공학회 2008년도 제33회 펄프종이기술 국제세미나
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• pp.87-122
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• 2008

In order to manage the papermaking procedure in an effective way, it is inevitably required to measure and estimate the various changing parameters of wet-end process control. This content is devoted to the explanation of lab scale new investigating method regarding wet-end process of paper machine by using RDA.

• Fibers and Polymers
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• 제7권3호
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• pp.305-309
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• 2006

This research studies the factors which influence the tensile strength of tire cords. Five yam samples are made by changing the spinning conditions and viscosity to get various physical properties. Different twisting methods are introduced and the yams are twisted under different processing conditions for each twisting process. With the experimental results, various analyses are performed to find the important factors in retaining strength after the twisting process. SEM and optical microscopic photographs are taken along with some measurements to assist the analysis.