• 한국어교육
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• 제25권1호
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• pp.83-113
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• 2014

This study aims to examine the change of strategy use by analyzing the refusal sequence of beginner Japanese Korean learners by time difference of 10 weeks. The results of the study are as follows; First, in the solidarity system of politeness(power-, distance-), learners showed similar ability as native Koreans after 10 weeks. Second, in the deference system(power-, distance+), there was a difference according to the situational burden when using strategies. In the invitational setting, the learners sought justification for their refusal or tried to negotiate by explaining in detail as time passed. However, in the request setting, they showed no will to compromise by refusing directly and leading the listener to give up. Third, similar difference was found in the use of strategies depending on the situational burden in the hierarchical system(power+, distance+). While learners could present their justification for refusal by showing their interest in the invitation as time passed in the invitation setting, they expressed straight refusal and were not willing to negotiate in the request setting.

• 한국컴퓨터정보학회논문지
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• 제10권6호
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• pp.269-278
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• 2005

인터넷 차단 시스템은 기업내부에서 직원들의 인터넷 사용 내역에 대한 세부적 통제 수단으로 많이 각광받고 있다. 인터넷 차단 시스템은 기업의 인터넷 사용 형태에 많은 변화를 가져오지만 아직까지 이의 효과에 대한 세부적인 연구가 진행된 사례가 없다. 본 논문은 인터넷 차단 시스템의 도입에 대한 경제적 효과를 분석하여 인터넷 차단 시스템을 현재 운영중이거나 도입에 대하여 검토 중인 기업의 투자 및 운영에 대한 의사결정지표를 제시한다. 기존 연구를 통해 인터넷 차단 시스템에 대한 비용 및 효과 측정 수단을 개발하였으며, 실제 기업 전산망에 인터넷 차단 시스템 및 관련 측정 시스템을 구축하여 시스템 구축 전후의 추이 변화를 측정하여 효과 분석에 사용했다. 결론적으로 인터넷 차단 시스템이 일부 역효과에도 불구하고 기업의 생산성 향상 및 통신 대역폭의 개선에 매우 긍정적인 효과를 준다고 파악하였다.

• 한국경영과학회지
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• 제12권1호
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• pp.157-157
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• 1987

Hydro-electric power generation from multi-purpose dams has been playing important roles in the electric power supply network in Korea. Although the total share of hydro power in national electricity supply now becomes very small, the peak-shaving and frequency control capability of hydro power helps the power company enormously in maintaining the quality of power. But since the company that builds and operates the multi-purpose dams in Korea has to sell all the electricity produced to the monopolistic utility, there have been various problems in justifying the investment, designing pricing mechanism, and controlling operations of the power plants. In addition, economic evaluation of the hydro power has been distorted by a variety of reasons and hence it has been very difficult to encourage effective development and utilization of national water resources. To make the problem worse, both parties are public companies with X-inefficiency problems. Thus, changing environment requires to reengineer the system that governs hydro power generation. We address the problems of Korean hydro-electric power generation system in four areas: the investment justification process, the operations decison right of the hydro power plants, the pricing of the purchased-power, and the negotiation of contract revision. Then we propose improvement directions of new hydro-electric power system in view of static and dynamic efficiency, X-inefficiency and equity.

• 대한전자공학회논문지
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• 제27권1호
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• pp.1-9
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• 1990

This paper investigates the significance and the implication of the pointer scheme, which was recently adapted by CCITT as a standard synchronization method in the broadband network-node interface environment, and discusses the merits of the pointer scheme in comparison with the conventional positive justification method. It also analyzes the jitter performance of the communication system employing the pointer scheme based on the fact that the pointer scheme corresponds to a multiple-bit positive/zero/negative justification.

• 산업경영시스템학회지
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• 제22권52호
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• pp.311-322
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• 1999

Major problems involved in an electrical utility expansion planning within a time horizon are how to efficiently deal with objectives considering multiple factors and uncertainty. But justification factors in study these days have considered only quantitative factors except qualitative factors. Therefore, the purpose of this paper is to develop a new model for economic evaluation of nuclear power plants through the scoring model with the quantitative and qualitative factors under uncertainty. The quantitative factors use a levelized generation cost method considering time value of money. Especially, the environmental, risk, and safety factors in this paper have been also explained for the rational economic justification of the qualitative factors under uncertainty. This paper not only proposes a new approach method using the scoring model in evaluating economy of the nuclear power plant in the long term, but also provides the more efficient decision making criterion for nuclear power plants under uncertainty.

• International Journal of Advanced Culture Technology
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• 제11권3호
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• pp.89-93
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• 2023

This study is a case study of the Ukrainian military's asymmetric combat performance method. The composition of this study is as follows. First, it presented the background for the outbreak of war in the macroscopic framework of Russia-Ukraine. Second, the Ukraine-Russia war, which broke out in February 2022, presented the justification for the study, that is, the direction of the Ukrainian military's asymmetric combat performance in terms of microscopic aspects of the study, and detailed analysis of precision strikes using commercial drones and advanced sensors. Finally, we covered in-depth the case of Ukrainian troops who attempted to attack Russian tanks using semi-automatic laser homing technology. Therefore, the Korean military organization also suggested the justification for gradually introducing and utilizing the system for the Ukrainian military's asymmetric combat performance method, and related follow-up studies should be actively conducted following this study.

• 산업경영시스템학회지
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• 제23권54호
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• pp.167-177
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• 2000

The problem of system reliability is very important issue in the nuclear power plant, because the failure of its system brings about extravagant economic loss, environment destruction, and quality loss. This paper therefore proposes a normalized scoring model by the qualitative factors order to evaluate the robust reliability of nuclear power plants under uncertainty. Especially, the qualitative factors including risk, functional, human error, and quality function factors for the robust justification has been also introduced. Finally, the analytical reliability and safety assessment model developed in this paper can be used in the real nuclear power plant.

• 산업경영시스템학회지
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• 제16권28호
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• pp.129-135
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• 1993

Quality is become not only the most critical component of manufacturing strategy but also the most critical measure of performance and justification of advanced manufacturing system. The objective of this paper is to offer classification & optimum concept of quality-cost and to illustrate a method of evaluation quality-cost then a case example is presented to illustrate the result of quantifying the suggested formula and these values are given to justify of management.

• 대한수학교육학회지:학교수학
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• 제16권3호
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• pp.491-502
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• 2014

이 연구는 예비교사들이 $0.99{\cdots}$가 1보다 작다는 주장을 어떻게 반박하는지를 관찰함으로서 왜 $0.99{\cdots}=1$가 참이라고 정당화하는지를 분석하였다. 일부 예비교사는 $1-0.99{\cdots}$의 값을 무한소라고 생각하고 있었다. 표준 실수의 입장에서 $1-0.99{\cdots}$의 값은 무한소가 아닌 0이라고 생각했던 예비교사들도 이것을 실수에 대한 가정으로부터의 논리적 결론으로 정당화하기보다는 유한과 무한은 다르다는 직관적 정당화에 안주하였다. 예비교사들이 $0.99{\cdots}$ <1의 반박에서 드러낸 인식의 한계는, 표준 실수 체계만이 수학적으로 옳은 유일한 수체계라는 믿음과 무관하지 않다. $0.99{\cdots}$ <1이지만 표준 실수체계와 마찬가지로 무모순인 비표준 실수체계가 존재한다는 사실은, 평범한 중학생이 제기하는 $0.99{\cdots}$가 1이냐 아니냐의 질문도 학교수학 수준의 상식적 설명 혹은 예비교사들의 직관적인 정당화만으로는 대답할 수 없는 것임을 보여주고 있다.

• Water Engineering Research
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• 제5권4호
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• pp.177-183
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• 2004

This paper introduces an eigenvalue method of transforming the hyperbolic partial differential equations of a particular unsteady friction water hammer model into characteristic form. This method is based on the solution of the corresponding one-dimensional Riemann problem that transforms hyperbolic quasi-linear equations into ordinary differential equations along the characteristic directions, which in this case arises as the eigenvalues of the system. A mathematical justification and generalization of the eigenvalues method is provided and this approach is compared to the traditional characteristic method.