• 대한전기학회논문지:시스템및제어부문D
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• 제50권9호
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• pp.439-446
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• 2001

This paper considers the design technique of the real-time control algorithm to implement the electronic interlocking system which is the most important station control system in railway signal field. The proposed technique consists of the structure design and the detail design which are based on the ROOM(Real-Time Object-Oriented Modeling). The structure design is designed with a modeling using the heuristic search technique which, at first, catch and make out the specific requested condition, and then, is designed on the requested condition. The detail design can be implemented if it may get the satisfying values through the repetitive modeling after comparing and examining the data obtained from the structure design in order for the more reliable and accurate system to be implemented. The technique proposed in this paper is implemented with C++ language which is easy to be transferred and compatible with the existing interfaces, and also the operating system is designed and simulated on the VRTX which is a real-time operating system. This proposed technique is applied to the typical station model in order to prove the validity as verifying the performance of the modeled station.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.502-507
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• 2003

Toward the development of practical methods for observed data oriented bispectral estimation, an automatic means for determining the smoothing bandwidth of bispectral windows is proposed, that can also provide an associated optimum bispectral estimate of stationary non-Gaussian signals, systematically only from an observed time series datum of finite length. For the conventional non-parametric bispectral estimation, the MSE (mean squared error) of the normalized estimate is reviewed under a certain mixing condition and sufficient data length, mainly from the viewpoint of the inverse relation between its bias and variance with respect to the smoothing bandwidth. Based on the fundamental relation, a systematic method not only for determining the bandwidth, but also for obtaining the optimum bispectral estimate is presented by newly introducing a MSE evaluation index of the estimate only from an observed time series datum of finite length. The effectiveness and fundamental features of the proposed method are illustrated by the basic results of numerical experiments.

• Journal of the Korean Wood Science and Technology
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• 제35권5호
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• pp.46-57
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• 2007

The leachability of boron in zinc borate (ZB)-modified oriented strandboard (OSB) from southern wood species was investigated in this study. The leaching experiments were conducted by exposing edge-sealed OSB samples under running water at $31^{\circ}C$ for 8, 24, 72, and 216 h. The results from leached samples were compared with those from the unleached controls. Boron leaching of the modified OSB occurred upon the initial water exposure, and the leaching rate decreased as the leaching time increased. Initial boric acid equivalent (BAE) level, wood species, and sample thickness swelling significantly influenced the leachability. There was no consistent effect of polyethylene glycol (PEG) on zinc borate leaching. The glue-line washing within OSB due to thickness swelling of the test samples under water and decomposition of the borate to form water-soluble boric acid were thought to be two possible causes for the observed leaching. The relationship between assayed BAE and leaching time followed a decaying exponential function for zinc borate treated OSB. From the boron/zinc ratio after each leaching period, boron element in ZB was more or less leachable. The material constant of the regression models allowed comparing the leachability of the modified OSB for various wood species. An unified leaching method for treated wood composite materials is needed.

• International Journal of Contents
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• 제5권1호
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• pp.15-20
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• 2009

In this paper, we propose u-Learning management systems which are designed and implemented based on learning activities oriented components. The proposed systems are composed of components which can process the functionalities for coming into actions of learning activities. Specially, each component is broken into class units by which learning activities of users can be performed on various devices. When users by to connect the proposed learning management system, the system explores devices of users and the corresponding connection program, and then selects components that are fitted to the activities and combines them in a real-time. Our system provides u-Learning environment so that users can use the learning activity services taking no influence on time, place, various devices and programs. That is different from traditional e-Learning system which cannot support various devices of users directly.

• 정보보호학회논문지
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• 제24권4호
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• pp.669-679
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• 2014

본 연구에서는 스마트금융 서비스를 위한 서버 측 보안 프레임워크를 제안한다. 국내 금융기관의 전자금융서비스를 제공하는 서버 측 프레임워크 구조를 살펴보면 대부분 서비스제공위주의 구조를 가지고 있다. 따라서, 보안관련 요구사항들은 비즈니스 로직들에 같이 포함되어 있는 경우가 대부분이기 때문에 보안 사고에 효과적으로 대응하기 어렵다. 본 논문에서는 전자금융서비스시 보안영역을 비즈니스영역과 분리하여 업무에 대한 의존도(Dependency) 없이 보안 정책을 실시간으로 적용할 수 있는 프레임워크를 제안한다. 이를 통하여 보안관련 위협에 대한 신속하고 효과적인 대응기반을 제시한다. 또한 현재 서비스하고 있는 시스템구조에서도 시스템의 큰 변경없이 제안 프레임워크를 적용할 수 있는 방안을 제시한다.

• 대한인간공학회지
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• 제28권1호
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• pp.1-7
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• 2009

As products are getting more diverse and new products are entering the market faster, customers have trouble learning how to use them. User-oriented menu structures may solve this problem. In order to design user-oriented menu structures, spreading activation theory has been studied. The spreading activation test shows that the strong associative relationship between words has shorter response times. Based on the spreading activation test, asymmetric spreading activation was introduced and a hypothesis that in a well-designed menu structure, association between upper-low menu pairs is not affected by an activation direction was tested for this study. In this study the menu of a cellular phone (Model: SPH-w2900) was extracted, and underwent 1st spreading activation tests. Then, on each menu pair, response time differences (asymmetric transition) by accuracy and directions were analyzed to find out problems in labels and improve menu structures and vocabulary. Second spreading activation tests were conducted to check whether asymmetric transitions decreased. The results showed that response time differences (asymmetric transition) for activation directions were found to be dropped significantly. Asymmetric transitions in spreading activation presented in this study will be helpful to define user-oriented menu structures.

• 소프트웨어공학소사이어티 논문지
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• 제24권1호
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• pp.27-33
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• 2011

최근 임베디드 시스템이 발전함에 따라서 저 전력에 대한 요구가 중요한 관심사가 되었다. 하지만 전력 관리 코드가 핵심 관심사 코드와 횡단 결합되어 있기 때문에 가독성과 유지보수성을 저하시키는 원인이 된다. 본 연구에서는 실행시간 동안 발생하는 누설전력을 감소시키기 위한 디바이스 사용에 집중한 전력관리 모델을 제시하고, 이러한 전력관리 모델에 관점지향 프로그래밍을 적용하여 전력관리 코드를 핵심관심사 코드와 분리한다. 마지막으로 제시한 전력관리 모델을 이론적인 방법과 실험적인 방법으로 평가한다.

• 한국생활과학회지
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• 제3권1호
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• pp.33-42
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• 1994

The main objective of this study was to find urban housewives' expenditure behavior type. For this objective 4 dimensions of income expenditure behavior were classified with factor analysis and correlation coefficient and then cluster analysis was implemented. Subjects were housewives living in Seoul. As a result, three income expenditure behavior type were defined. They were type of high interested in income expenditure, time oriented type, and money oriented type.

• 한국안전학회지
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• 제13권1호
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• pp.77-84
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• 1998

Hazard and operability (HAZOP) analysis is one of the safety analysis method that is used in the chemical complex, because it can systematically identify causes and consequences of all the deviation that could occur. Since this method needs to hire specialized experts, it is costly and time-consuming. Therefore HAZOP Expert System has been developed to automate this analysis. This approach introduced object-oriented method and knowledge representation which is hierarchical tree of units to supply flexibility in the system, functional semantic network, propagation equation and rule-chaining method to set up the expert system for automating HAZOP analysis.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2005년도 춘계학술대회 논문집
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• pp.74-81
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• 2005

In this study, we introduce a 3D simulation model to support the design on ACT(Automated Container Terminal) using 3D animation. The developed simulation model simulate virtual operations of ACT and animate the simulated results with real time. We provide several validation points for the design of ACT. And the developed system applied an object-oriented design and C++ programming to increase the reusability and extensibility. We can perform the various simulation experiment and analyze performances to estimate the required number of equipment using developed simulation model.