• 지식경영연구
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• 제11권3호
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• pp.13-29
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• 2010

This study aims to investigate the effect of mentoring functions (career development, role modeling, and psychosocial function) on the motivation to adopt knowledge and the success of knowledge transfer in formal mentoring relations. There are considerable empirical investigation into the antecedents and consequences of mentoring, such as organizational commitment, organizational citizenship behavior, job satisfaction, In this paper, based on the relevant literatures, hypotheses are established and empirically tested that are about the effect of mentoring functions on the motivation to adopt knowledge, and the effect of motivation to adopt knowledge on the success of knowledge transfer. Using a sample of 287 service industry employees, the empirical results shows that career development and role modeling functions ware positively related to motivation to adopt knowledge, but psychosocial function was not significantly related. In addition, the motivation to adopt knowledge was positively related to the success of knowledge transfer. Based on these findings, implication and future direction are discussed.

• ETRI Journal
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• 제21권4호
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• pp.52-64
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• 1999

QoS monitoring is a kind of real-time systems which allows each level of the system to track the ongoing QoS levels achieved by the lower network layers. For these systems, real-time communications between corresponding transport protocol objects is essential for their correct behavior. When two or more entities are employed to perform a certain task as in the case of communication protocols, the capability to do so is called interoperability and considered as the essential aspect of correctness of communication systems. This paper describes a formal approach on modeling and interoperability test case generation of a real-time QoS monitoring protocol. For this, we specify the behavior of flow monitoring of transport layer QoS protocol, i.e., METS protocol, which is proposed to address QoS from an end-to-end's point of view, based on QoS architecture model which includes ATM net work in lower layers. We use a real-time Input/Output finite State Machine to model the behavior of real-time flow monitoring over time. From the modeled real-time I/OFSM, we generate interoperability test cases to check the correctness of METS protocol's flow monitoring behaviors for two end systems. A new approach to efficient interoperability testing is described and the method of interoperability test cases generation is shown with the example of METS protocol's flow monitoring. The current TTCN is not appropriate for testing real-time and multimedia systems. Because test events in TTCN are for message-based system and not for stream-based systems, the real-time in TTCN can only be approximated. This paper also proposes the notation of real-time Abstract Test Suite by means of real-time extension of TTCN. This approach gives the advantages that only a few syntactical changes are necessary, and TTCN and real-time TTCN are compatible. This formal approach on interoperability testing can be applied to the real-time protocols related to IMT-2000, B-ISDN and real-time systems.

• 대한의용생체공학회:의공학회지
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• 제16권4호
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• pp.415-424
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• 1995

Combined models, specified by two or more modeling formalisms, can represent a wide variety of complex systems. This paper describes a methodology for the development of combined models in two model types of discrete event and continuous process. The methodology is based on transformation of continuous state space into discrete one to homomorphically represent dynamics of continuous processes in discrete events. This paper proposes a formal structure which can combine model of the DES and the CS within a framework. The structure employs the DEVS formalism for the DES models and differential or polynomial equations for the CS models. To employ the proposed structure to specify a DEVS/CS combined model, a modeler needs to take the following steps. First, a modeler should identify events in the CS and transform the states of the CS into the DES. Second, a modular employs the formalism to specify the system as the DES. Finally, a moduler developes sub-models for the CS and continguos states of the DES and establishs one-to-one correspondence between the sub-models and such states. The proposed formal structre has been applied to develop a DEVS/CS combined model for the human cardiovascular system. For this, the cardiac cycle is partitioned into a set of phases based on events identified through observation. For each phase, a CS model has been developed and associated with the phase. To validate the DEVS/CS combined model developed, then simulate the model in the DEVSIM + + environment, which is a model simulation results with the results obtained from the CS model simulation using SPICE. The comparison shows that the DEVS/CS combined model adequately represents dynamics of the human heart system at each phase of cardiac cycle.

• 정보보호학회논문지
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• 제20권1호
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• pp.113-121
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• 2010

시스템 명세 기법은 시스템의 구조와 행위특성을 형식적인 표현을 통해 제시하기위해 사용되는 시스템 이론 기반의 정형화된 표현 기법이다. 시스템 명세 기법을 시스템의 설계 단계에서 활용할 경우, 계층적이고 모듈화된 시스템에 대한 정의와 유지보수의 용이성 확보가 가능하여 합리적인 개발이 가능하게 된다. 본 연구에서는 개인정보 사용의 위험 상황을 모바일 장치를 이용하여 정보의 소유자에게 알려주고, 이에 대한 응답을 관리하는 기술을 제시하고 있다. 특히, 모바일 장치가 갖는 제약사항을 해결하기 위한 메시지의 형식을 정의하여 제시하였다. 본 기술이 적용된 알람 시스템은 계층적이고 모듈화된 형태로 모델링하기 위해 시스템명세를 기반으로 하였다. 또한, 시스템 명세화 기법 기반의 설계를 통해 알람시스템을 개발하고 본 시스템의 효율성을 검증 하였다. 본 논문의 기여도는 시스템명세기법을 사용한 개인정보 유출상황의 유연성 있는 표현과 관리를 가능하게 한 시스템의 설계 및 구현에 있다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제26권8호
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• pp.988-999
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• 1999

본 논문은 SCR 방법으로 작성된 요구사항 명세의 정형적인 의미론을 제안한다. 먼저 우리는 SCR 명세를 시간적전이시스템으로 변환함으로써 SCR 명세의 의미론을 정의한다. 그리고 우리는 SCR 방법을 실시간 시스템의 명세를 위하여 확장하며, 확장된 SCR 명세의 의미론 또한 시간적전이시스템으로의 변환을 통하여 정의한다. 이러한 의미론은 SCR 명세의 병행성과 시간 개념을 제대로 나타낼 수 있으며, 시간적전이시스템에서의 검증 방법을 SCR 명세의 검증에 직접 적용할 수 있게 하는 장점이 있다.Abstract This paper presents a formal semantics for requirements specifications written in the SCR method. We define a semantics for SCR specifications by a translational approach into timed transition systems. Then we extend the SCR method for real-time systems and define a semantics for timed SCR specifications. The main benefit from providing such semantics is that it provides a natural modeling of concurrency and time in SCR specifications. The semantics enables us to directly apply verification methods for timed transition systems to SCR specifications.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권2호
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• pp.201-206
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• 2010

발전소와 임베디드 시스템, 지능형 빌딩과 같은 현대의 대부분의 시스템은 PLC 라는 특수목적 컴퓨터를 이용하여 자동제어된다. PLC 프로그래밍 언어 중에서 가장 많이 사용하는 것은 LD 프로그램이다. LD 프로그램의 검증은 시뮬레이션과 테스팅등을 통해 이루어지는데 이러한 방법은 프로그램 검증에 한계가 있다. 본 논문에는 LD 프로그램의 검증시 모델 체킹을 사용할 수 있도록 주어진 LD 프로그램을 모델 체커의 입력으로 자동으로 변환하는 방법을 기술한다. LD 프로그램과 SMV 모델의 의미구조를 정의 하고 이를 바탕으로 의미가 보존되는 변환 함수를 정형적으로 나타낸다.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제8권2호
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• pp.97-113
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• 2004

The purpose of this study is to develop instructional methods for the formalized algorithm through informal knowledge in teaching division of fractions. The following results have been drawn from this study: First, before students learn formal knowledge about division of fractions, they knowledge or strategies to solve problems such as direct modeling strategies, languages to reason mathematically, and using operational expressions. Second, students could solve problems using informal knowledge which is based on partitioning. But they could not solve problems as the numbers involved in problems became complex. In the beginning, they could not reinvent invert-and-multiply rule only by concrete models. However, with the researcher's guidance, they can understand the meaning of a reciprocal number by using concrete models. Moreover, they had an ability to apply the pattern of solving problems when dividend is 1 into division problems of fractions when dividend is fraction. Third, instructional activities were developed by using the results of the teaching experiment performed in the second research step. They consist of student's worksheets and teachers' guides. In conclusion, formalizing students' informal knowledge can make students understand formal knowledge meaningfully and it has a potential that promote mathematical thinking. The teaching-learning activities developed in this study can be an example to help teachers formalize students' informal knowledge.

• Nuclear Engineering and Technology
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• 제35권1호
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• pp.64-79
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• 2003

In the risk and reliability analysis of complex technological systems, the primary concern of formal uncertainty analysis is to understand why uncertainties arise, and to evaluate how they impact the results of the analysis. In recent times, many of the uncertainty analyses have focused on parameters of the risk and reliability analysis models, whose values are uncertain in an aleatory or an epistemic way. As the field of parametric uncertainty analysis matures, however, more attention is being paid to the explicit treatment of uncertainties that are addressed in the predictive model itself as well as the accuracy of the predictive model. The essential steps for evaluating impacts of these model uncertainties in the presence of parameter uncertainties are to determine rigorously various sources of uncertainties to be addressed in an underlying model itself and in turn model parameters, based on our state-of-knowledge and relevant evidence. Answering clearly the question of how to characterize and treat explicitly the forgoing different sources of uncertainty is particularly important for practical aspects such as risk and reliability optimization of systems as well as more transparent risk information and decision-making under various uncertainties. The main purpose of this paper is to provide practical guidance for quantitatively treating various model uncertainties that would often be encountered in the risk and reliability modeling process of complex technological systems.

• 한국정보처리학회논문지
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• 제7권3호
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• pp.891-900
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• 2000

A Visual development framework for embedded system is presented based on virtual prototyping. Embedded systems often are used in life critical situation, where reliability is very important. Time_to_market, correctness, user_friendly_design are another features required for embedded system design. However, embedded systems are today designed with an ad hoc approach that is heavily based on earlier experience with similar products. We believe that new design paradigm is needed and it should be based on the use of formal model and visual system to describe the behavior of the system at a high level abstraction. Virtual prototyping has all the required features. It has the following advantages; correct design, clear interface definition, idea experimentation, increased communication. In this paper, we describe the design and implementation of VIP/Sim(Virtual Prototyping Simulator), a visionary development framework for embedded system design. New feature such as state polymorphism is augmented to the de_facto standard formal language, statechart, for enhanced dynamic modeling. Actual design experience with VIP/Sim is also discussed.

• Journal of Computing Science and Engineering
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• 제1권2호
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• pp.125-160
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• 2007

Data Warehousing and OLAP (On-Line Analytical Processing) have turned into the key technology for comprehensive data analysis. Originally developed for the needs of decision support in business, data warehouses have proven to be an adequate solution for a variety of non-business applications and domains, such as government, research, and medicine. Analytical power of the OLAP technology comes from its underlying multidimensional data model, which allows users to see data from different perspectives. However, this model displays a number of deficiencies when applied to non-conventional scenarios and analysis tasks. This paper presents an attempt to systematically summarize various extensions of the original multidimensional data model that have been proposed by researchers and practitioners in the recent years. Presented concepts are arranged into a formal classification consisting of fact types, factual and fact-dimensional relationships, and dimension types, supplied with explanatory examples from real-world usage scenarios. Both the static elements of the model, such as types of fact and dimension hierarchy schemes, and dynamic features, such as support for advanced operators and derived elements. We also propose a semantically rich graphical notation called X-DFM that extends the popular Dimensional Fact Model by refining and modifying the set of constructs as to make it coherent with the formal model. An evaluation of our framework against a set of common modeling requirements summarizes the contribution.