• Composites Research
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• 제20권1호
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• pp.15-22
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• 2007

이 논문에서는 섬유강화 복합재료에서의 초음파의 거동에 대해 파동의 모드, 방향, 자유표면에서의 반사파의 반사계수 등을 예측하는 해석적인 방법을 소개한다. 이 논문은 또한 복합재료의 자유표면에서 반사가 일어날 때의 특이한 현상을 새로이 고찰하였는데, 이는 완도면(slowness surface)만을 고려하면 존재할 것으로 예상되지만 실제로는 존재하지 않는 반사파에 대한 것이다. 이는 입사파가 유사횡파일 경우, 입사각이 이 논문에서 새로 정의된 제3임계각을 넘어설 경우 나타나는 현상이다. 본 논문의 내용은 초음파검사와 같은 해당 분야에 종사하는 연구자들에게 유용한 가이드라인을 제시할 것으로 기대된다.

• 대한수학회보
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• 제50권1호
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• pp.57-71
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• 2013

In this paper, we establish the existence of at least three solutions to a Navier boundary problem involving the ($p_1$, ${\cdots}$, $p_n$)-biharmonic systems. We use a variational approach based on a three critical points theorem due to Ricceri [B. Ricceri, A three critical points theorem revisited, Nonlinear Anal. 70 (2009), 3084-3089].

• 한국전자거래학회:학술대회논문집
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• 한국전자거래학회 2004년도 e-Biz World Conference
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• pp.89-97
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• 2004

1. Introduction; Fundamental Difference between conventional old commerce and e-commerce？ 2. "Quantity changes into Quality"; Phase transition and Critical phenomena Logarithmic Convergence and Emergence of Quality 3. Networked Small World; Indications from Genomics; Power-Law Ordered Plain Structure of Super-Complex System ⇔ The Structure of e-Biz. 4. Uniquitous Crisis to Ubiquitous Critical Points for the Emergence of Qualified Business with e-strucrure

• Nonlinear Functional Analysis and Applications
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• 제27권3호
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• pp.649-662
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• 2022

This paper is concerned with the existence of solutions for a class of 𝚽-Kirchhoff type equations with critical exponent in Orlicz-Sobolev spaces. Our technical approach is based on variational methods.

• Earthquakes and Structures
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• 제4권4호
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• pp.383-396
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• 2013

In earthquake engineering area, the critical excitation method is an approach to find the most severe earthquake subjected to the structure. However, given some earthquake constraints, such as intensity and power, the critical excitations have spectral density functions that often resonate with the first modes of the structure. This paper presents a non-stationary critical excitation that is capable of exciting the main modes of the structure using a non-uniform power spectral density (PSD) that is similar to natural earthquakes. Thus, this paper proposes a new method to estimate the power and intensity of earthquakes. Finally, a new method for the linear seismic design of structures using a modified non-stationary critical excitation is proposed.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• 제41권3호
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• pp.149-155
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• 2015

Surgical approaches to the condylar fracture include intraoral, preauricular, submandibular, and retromandibular approaches. Each approach has its own advantages and disadvantages. When a patient needs esthetic results and an intraoral approach is not feasible, the transmasseteric antero-parotid facelift approach is considered. This approach permits direct exposure and allow the surgeon to fixate the fractured unit tangentially. Tangential fixation is critical to osteosynthesis. Disadvantages of the transmasseteric antero-parotid facelift approach include damage to the facial nerve and a longer operation time. However, after the initial learning curve, facial nerve damage can be avoided and operation time may decrease. We report three cases of subcondylar fractures that were treated with a transmasseteric antero-parotid facelift approach. Among these, two cases had trivial complications that were easily overcome. Instead of dissecting through the parotid gland parenchyma, the transmasseteric antero-parotid facelift approach uses transmasseteric dissection and reduces facial nerve damage more than the retromandibular transparotid approach. The esthetic result is superior to that of other approaches.

• 한국철도학회논문집
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• 제13권2호
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• pp.222-228
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• 2010

전기 기관차 중수선 시설과 같이 복잡한 시스템의 설계 변수와 중요 변수 최적화는 수리적인 형태로 분석하는 것이 매우 어려운 작업이 된다. 본 논문에서는 메타 모델의 개념을 시뮬레이션 근사 모델에 적용하여 설계 변수와 중요 변수의 최적화를 수행하였다. 시뮬레이션 설계를 위하여 Critical Path 분석과 민감도 분석 수행하여 설계 변수와 실험 횟수를 줄이기 위하여 노력을 하였다. 시뮬레이션 분석은 다 목적 비선형 계획법을 구성한 후 파레토 최적해 집합을 산출하여 설계자에게 다중 대안의 해 집합을 제시하여 실제 시스템의 적용에 대한 유동성을 제공하려고 노력하였다. 본 논문에서 제시 된 기법은 열차 중수선 시설의 설계 및 분석에 있어서 시뮬레이션과 메타 모델을 이용한 하나의 방법으로 이용이 가능 할 것이다.

• 대한간호학회지
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• 제33권6호
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• pp.678-685
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• 2003

Purpose: The purpose of the study was to interpretate Caper's view of the aesthetical approach to nursing, to discover problems of her arguments, and to ultimately expand the horizon of the aesthetical thinking of nursing. Method: By means of the critical interpretation of Caper's paper, problems of her arguments were discovered. This then was suggested was the proper way of the aesthetical approach to nursing. Result: Caper's arguments of aesthetics were seen to be confused, regarding the pattern of the nursing art and the relationship between aesthetical knowing and practical art, and to have no the nursing's perspective as moral art. The proper paradigm for the distinct thinking of the nursing aesthetics could be offered here through applying some aesthetical theories as follows; a mode of aesthetical knowing could be characterized as emphatical awareness in relationship between nurse and client, and a practical art of nursing understood as moral art in sense of the expression of the human dignity. Conclusion: This study suggested fundamental theme for the proper aesthetical approach to nursing in view of the aesthetical knowing and the practical art. The horizon of the aesthetical thinking in nursing can be expended through the inquiry into aesthetical theories which offer theoretical the base for nursing as an art.

• Journal of Electrical Engineering and Technology
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• 제2권3호
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• pp.386-390
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• 2007

At recent times, an essential issue in the replacement of the old analogue I&C to computer-based digital systems in nuclear power plants becomes the quantitative software reliability assessment. Software reliability models have been successfully applied to many industrial applications, but have the unfortunate drawback of requiring data from which one can formulate a model. Software that is developed for safety critical applications is frequently unable to produce such data for at least two reasons. First, the software is frequently one-of-a-kind, and second, it rarely fails. Safety critical software is normally expected to pass every unit test producing precious little failure data. The basic premise of the rare events approach is that well-tested software does not fail under normal routine and input signals, which means that failures must be triggered by unusual input data and computer states. The failure data found under the reasonable testing cases and testing time for these conditions should be considered for the quantitative reliability assessment. We presented the quantitative reliability assessment methodology of safety critical software for rare failure cases in this paper.

• 영어어문교육
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• 제4호
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• pp.15-38
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• 1998

The main purpose of this paper is to take a look at a controversial approach to critical discourse analysis for the suggestion of a well-balanced perspective on such a biased presupposition and methodology. Currently linguists, language teachers and even social scientists have shown their strong interests in critical language awareness and its ideological involvements in order to encourage the general public to realize the social function of language in all modes of communication. It seems, however, to me to be increasingly clear that critical language study calls for a careful attempt based on an appropriate combination of textual facts and contextual factors in the interpretation of discourses. From this point, of view, this paper suggests some pedagogic / analytical guidelines for a study on language and its social connotations as a result of examining the cogency of two contrasting argumentations in relation to critical discourse analysis.