• 한국정밀공학회지
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• 제26권10호
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• pp.7-11
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• 2009

• 한국컴퓨터정보학회논문지
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• 제9권3호
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• pp.135-141
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• 2004

소프트웨어의 종류가 다양하고, 커짐에 따라서 유지 보수 문제는 더욱 복잡하고 어렵게 되고, 프로그램 에러의 교정이나 요구 사항의 변경, 사용자에 대한 요구가 점차 증가되면서 소프트웨어의 유지 보수가 소프트웨어 생명 주기에서 가장 비용을 많이 차지하는 부분이 되었다. 본 논문에서는 객체지향 시스템에서 소프트웨어 재구성 환경을 위한 역공학 도구를 설계, 구현하였다. 이 도구는 클래스 정보를 이용한 규칙기반 역공학 도구이다. 프로그램 유지보수자가 프롤로그를 이용한 시스템 쿼리를 사용할 수 있도록 하였다. 대부분의 유사한 클래스를 추출하기 위한 재구조화 방법과 변수와 함수 사이의 관계에 근거를 둔 방법을 사용하였다. 추출된 클래스의 가시성이 자동적으로 산출되고, 논리언어를 이용한 쿼리를 사용함으로서 실질적인 유지보수가 이루어지도록 하였다. 또한 이 도구를 평가하는 방법을 제안하였다.

• 한국위성정보통신학회논문지
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• 제4권1호
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• pp.8-13
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• 2009

한국전자통신연구원은 다양한 위성항법 응용프로그램과 항법알고리즘을 시험 및 평가하기 위한 소프트웨어 레벨의 환경을 제공하는 위성항법 신호생성 및 수신처리 시뮬레이터 툴을 개발하고 있다. 본 시뮬레이션 툴은 GPS 및 갈릴레오의 디지털 신호 생성하고 이를 수신처리하는 툴을 제공하게 된다. 본 논문에서는 이러한 위성 항법 신호생성 및 수신처리 시뮬레이션 툴의 상세설계 및 모듈 구현에 대하여 기술하고 있다.

• 한국정밀공학회지
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• 제18권2호
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• pp.84-89
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• 2001

In recent years, there is increasing demand of esthetic design and complex function in aerospace, automobile and die/mold industry, which brings into limelight high-precision, high-efficient machining of sculptured surface. This paper deals with the establishment of the optimal tool path on free form surface in high speed ball end milling. Ball end milling is widely used for free form surface die and mold. In this machining, the cutting direction was changed with tool path. The cutting characteristics, such as cutting force and surface form are varied according to the variation of cutting directions. In this paper, the optimal tool path with down cutting in free form surface cutting is suggested.

• 한국기계가공학회지
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• 제18권2호
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• pp.96-101
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• 2019

This paper presents a machinability evaluation of Inconel 718 material when using a new uniform-temperature indirect cooling method that incorporates constant-pressure liquid nitrogen (LN2). The flank wear of a TiAlN coated tool used with this indirect cooling system was much lower than that of the tool used with dry machining under all machining conditions. Also, the surface roughness resulting from machining with this indirect method was far less than that of a dry machined surface after the same cutting time. Reduced heat generation and uniform temperature in turning operations play important roles in tool life and surface quality.

• 한국지진공학회논문집
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• 제26권3호
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• pp.127-136
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• 2022

Recently, an unprecedented emerging infectious disease has rapidly spread, causing a global shortage of wards. Although various temporary beds have appeared, the supply of wards specializing in infectious diseases is required. Negative pressure isolation wards should maintain their function even after an earthquake. However, the current seismic design standards do not guarantee the negative pressure isolation wards' operational (OP) performance level. For this reason, some are not included in the design target even though they are non-structural elements that require seismic design. Also, the details of non-structural elements are usually determined during the construction phase. It is often necessary to complete the stability review and reinforcement design for non-structural elements within a short period. Against this background, enhanced performance objectives were set to guarantee the OP non-structural performance level, and a computerized tool was developed to quickly perform the seismic design of non-structural elements in the negative pressure isolation wards. This study created a spreadsheet-based computer tool that reflects the components, installation spacing, and design procedures of non-structural elements. Seismic performance review and design of the example non-structural elements were conducted using the computerized tool. The strength of some components was not sufficient, and it was reinforced. As a result, the time and effort required for strength evaluation, displacement evaluation, and reinforcement design were reduced through computerized tools.

• 한국공작기계학회논문집
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• 제14권2호
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• pp.8-13
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• 2005

This study proposes the construction of 2-3 dimensional attractor system for cutting characteristics evaluation of metals. Also this paper aims to find the optimal cutting conditions of diamond turning machine by measuring surface form and roughness to perform the cutting experiment of metals, which are aluminum, with diamond tool. As well, according to change cutting conditions such as feed rate, using diamond turning machine to perform cutting processing, by measuring cutting force and surface roughness and according to cutting conditions the aluminum about cutting properties. Trajectory changes in the attractor indicated a substantial difference in attractor characteristics. Constructed 2-3 dimensional attractor system in this study can be used for cutting characteristics evaluation of metals.

• 한국정밀공학회지
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• 제20권1호
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• pp.63-69
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• 2003

This study proposes the construction of attractor simulator for cutting characteristics evaluation of non-ferrous metals. Also this paper aims to find the optimal cutting conditions of diamond turning machine by measuring surface form and roughness to perform the cutting experiment of non-ferrous metals, which are aluminum, with diamond tool. As well, according to change cutting conditions such as feed rate, cutting force and surface roughness are measured by tool dynamometer. Trajectory changes in the attractor indicated a substantial difference in fractal characteristics. Constructed attractor in this study can be used for cutting characteristics evaluation of non-ferrous metals

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.1005-1008
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• 1995

The spindle is a very important part of machine tool. The evaluation of spindle motion is required for improving the performance of machine tools. The evaluation tools have been developed for precison spindle by the reversal technique, and 3D error map motion of spindle is proposed. This technique makes us understand the total movement of spindle more easily. The proposed technique has been successfully applied to practical machine tools, giving high potentials for the spindle performance measurement.

• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2004년도 춘계학술대회
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• pp.229-244
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• 2004

The purpose of this paper is to find the method to improve the web accessibility of Korean Government's web sites through the investigation on the evaluation result of visually impaired people and the accessibility evaluation tool. Twenty five Korean Governments' web sites are chosen for this experiment. First, all of the sites are evaluated by accessibility evaluation tool (A-Prompt) based on Priority one of the Web Contents Accessibility Guidelines (WCAG) 1.0 of W3C. Second, three visually impaired people tried to find information or resister for the sites to check the accessibility. All of the sites are failed to conform to WCAG 1.0 and most of those are not accessible to information. The last part of this paper presents the method to improve the web accessibility of the Government's web sites.