• Journal of Advanced Navigation Technology
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• v.20 no.6
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• pp.544-555
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• 2016

Organizations of airport continue to invest heavily in the acquisition of self-esteem. Because, it is that self-esteem will become more productive. In this article, We verify to influence in the operation performance by the air navigation system and moderated effect of self-esteem. A survey of Incheon International Airport and Gimpo International Airport was conducted to better understand the factors that affect air navigation system to explain operation performance of airport perspective on air navigation system operator. The findings indicate that the positively moderated self-esteem affects operation performance of airports. We also confirmed that air navigation policy, maintenance, and promotion activities of air navigation system factors are affecting the operation performance of airports. The results of this study suggest that self-esteem could be the basis for a strong measurement tool to evaluate whether self-esteem in a given organization of airport are meeting enhancement of operation performance.

• Korean Journal of Logic
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• v.13 no.2
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• pp.167-201
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• 2010

This paper aims to scrutinize the possibility of mereology as philosophically satisfiable metalogic. Motivation for this is straightforward. As I see, a traditional approach to metalogic presented in the name of mathematical logic posits the existence of mathematical entities such as sets, functions, models, etc. to give definitions of logical concepts like logical consequence. As a result, whenever logic is used in any individual sciences, this set-theoretical metalogic cannot but add these mathematical entities to the domain of them. This fact makes this approach contradict to the ontological conservativeness of logic. Mereology, however, has been alleged to be ontologically innocent, while it is a formal system very similar to set theory. So it may well be that some people thought of mereology as a good substitute for set theoretic metalanguage and concepts for ontologically neutral metalogic. Unfortunately, when we look into argument for the ontological innocence of mereology, we can find that mereological entities such as mereological sums or fusions are not ontologically neutral. Thus we can conclude that mereological approach to metalogic is not promising at all.

• Journal of the Korean association of regional geographers
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• v.10 no.1
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• pp.96-109
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• 2004

Applying the construct of country image this study examined city image for Daegu in Korea. Study 1 measured the city image for Daegu and Seoul, identified the city image dimensions, and compared the images of the two cities. Study 2 confirmed the city image dimensions and examined the Daegu image by residency and demographic characteristics of respondents in Daegu and Seoul regions. The study extracted 4 dimensions of city image including economy, people, conservatism, and development capability. High conservatism and low economic prosper represented the image of Daegu while the opposite did of Seoul. Regardless of residency, single and Young respondents with high income and education had negative images for Daegu, and residents in Daegu rather than in Seoul had more negative images.

• The Transactions of the Korea Information Processing Society
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• v.1 no.3
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• pp.299-310
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• 1994

Re-engineering tools can substantially increase software maintenance productivity and the quality of maintenance work. Re-engineering usually involves changing the form(e.g.changining objects names and definitions, restructuring process logic) of a program. In this paper, we describe the design and implementation of InMaC＋＋ that is a software tool oriented towards maintenance of C＋＋ object oriented programs. With InMaC＋＋, programms can be displayed and edited in two forms : as the code and as the diagram InMaC＋＋ also contains transformations in both directions, i,e. from code to diagram and from diagram to skeletons of code. Hence, it is suitable for re-engineering and maintenance of existing code. Specially designed browsers implement the graphical interface. InMaC＋＋ contains a database that is based on a simple but effective data model of InMaC＋＋ programs. The model contains only four object classes and three relations, which makes the tool small, and easy to implement and use. A simple query language allows browsing through the database.

• The KIPS Transactions:PartA
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• v.16A no.4
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• pp.273-288
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• 2009

Because of a number of internet concurrent users and the diversity of goods and data items to be managed, the web sites for internet shopping mall are changed and their management application are updated frequently. So the existing internet shopping mall systems to be implemented by process-based design have the bad adaptability, then we have the difficulty for its maintenance and the overhead cost owing to a variety of changes in the future. Therefore to improve on its adaptability and maintenance, in this study, we design and implement the natural soap shopping mall system with the data model based method. In this paper, the data model designed for the system is considered requirements in the future, and in the view of DA(Data Architecture) it is designed and implemented including the data standardization, then the system has the improved adaptability and maintenance.

• Journal of the Korean Recycled Construction Resources Institute
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• v.11 no.4
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• pp.433-439
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• 2023

In this study, the bonding performance of repair materials was evaluated on concrete repair surface to develop concrete repair materials based on UHPC (Ultra High Performance Concrete) which has high mechanical and durability performance. The ten test variables were applied considering the roughness and wet condition of the concrete surface subject to repair, the addition of polymer, and the use PP and PVA fibers in repair materials. The addition of the polymer caused a significant decrease in strength, which was thought to be due to the effect of the additional super plasticizer used to adjust workability. Also, flow was reduced by up to 13.8 % with the use of plastic-based fibers. As a result of evaluating the bond strength of the repair material considering the condition of the surface subject to repair, it was thought that in the case of using UHPC-based repair material, high bonding performance could be secured without any additional surface treatment as long as the surface of the base material was sound. In addition, UHPC-based repair materials showed high bonding performance even when the attachment surface was wet. In the future, research will be conducted on shot-crete application and gradient pouring for the development of UHPC-based repair materials, and continuous improvement in the repair material mixing property will be carried out to ensure economic efficiency and performance as a concrete structural repair material.

• Journal of KIISE:Software and Applications
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• v.26 no.3
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• pp.401-411
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• 1999

RPC(Remote Procedure Call)는 프로그래밍이 쉽고 데이터 표현이 기계 독립적이므로 네트워크 파일 시스템등의 시스템 프로그래밍에서만 아니라 응용 프로그래밍에서도 활발히 사용되고 있다. 그러나 복잡하고 다양한 기능의 최신 프로그램을 개발하는데는 미흡한 점이 많고, 다른 RPC 표준간의 호환성이 결여되어 있어 유지보수가 어려운 단점을 가지고 있다. 본 논문에서는 객체 랩퍼 기술에 입각한 CORBA 계층을 추가함으로써 RPC 프로그래밍을 수정하는 단점을 해결하고 , 기존 RPC 프로그램을 재사용하면서 다중 플랫폼에서 RPC 프로그램을 연동하고 객체 지향 프로그래밍에 의한 재사용과 유지보수성을 높일 수 있는 WDL(Wrapper Definition Language)와 랩퍼 클래스 자동생성기를 제안한다. 사용사례로 기존 파일 전송 RPC 서버 프로그램을 랩핑해서 Unix, Windows 95 및 웹상에서 CORBA클라이언트와 연동할 수 있음을 보인다. 이 과정에서 RPC 프로그램의 구조적 프로그래밍에서 객체지향 프로그래밍으로의 전환이 가능하므로 객체 지향 방법론의 장점인 높은 재사용성과 유지보수성을 가질 수 있고 기존 RPC 서버 프로그램의 수정 없이 사용 가능할수 있다.

• Proceedings of the KIEE Conference
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• 2006.11a
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• pp.117-119
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• 2006

주기적인 점검이 필수적인 전력설비에 대해 RCM (Reliability centered maintenance) process를 적용 하면 유지보수 비용을 절감할 수 있을 뿐만 아니라 안전, 환경상의 건전성과 설비의 가용도 및 신뢰성 향상에 기여할 수 있다. 하지만 RCM 기반의 진단 process는 정형화하기 매우 까다롭다. 당사에서는 반복되는 시간 지향형 보수 활동을 최소화 하고, 고장원인 및 결과 분석에 바탕을 두어 보수 지침을 작성하고 시행할 수 있는 RCM기반의 진단 시스템 개발에 대해 논하고자 한다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.119-126
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• 2008

방위산업분야의 항공기용 전자장비는 신뢰성 설계를 위하여 MIL규격이나 실측된 PSD데이터를 이용하여 보수적으로 설계하는 것이 일반적이다. 하나의 프로젝트에서 개발되는 PCB는 수십 종에 이르고 그 장착위치나 설계변경이 병행되므로 PSD랜덤 진동해석의 대안으로 등가정적해석을 수행하게 된다. 등가정적해석결과의 보수성을 확인하기 위하여 PSD랜덤진동해석으로부터 추출된 정규분포를 갖는 각 방향 응력에 대해 Monte Carlo모의를 수행하여 결과를 비교분석하였다. 결론적으로 PSD랜덤진동 해석의 대안으로 등가정적해석결과의 유용성과 보수성을 통계적으로 비교하였고 실험을 통하여 결과의 타당성을 보였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05c
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• pp.1729-1732
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• 2003

EJB는 J2EE 기반의 분산 컴포넌트 모델로 재사용 가능한 소프트웨어이다. 그중 데이터베이스의 데이터를 객체화한 엔티티 빈 컴포넌트는 영속성에 따라 CMP와 BMP로 구분이 되는데, BMP는 영속성의 차이로 인해 CMP와 조립하기 어려워 재사용성이 떨어지고, 소스코드가 복잡해 유지보수가 어렵다. 본 논문에서는 EJB 컴포넌트 중에서 BMP를 기반으로 구현한 엔티티 빈에 Dual Persistent 엔티티 빈 패턴(Entity Bean Pattern)을 적용하여 재사용성을 향상시키고, 소스코드를 리팩토링(Refactoring) 하여 유지보수성 향상시키는 DPwR(Dual Persistence with Refactoring) 방법을 제안하였다.