• 한국의류학회지
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• 제41권5호
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• pp.950-965
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• 2017

This present study proposed a newly developed test method to evaluate the dexterity and mobility of a firefighter's protective gloves. The first step evaluated the mobility and dexterity of the current type of fire protective gloves and three new types of protective gloves using Don-doff test, ASTM dexterity, Minnesota dexterity, Bennett hand tool test, and ASTM torque test. Three firefighters ($47.3{\pm}5.0yr$ in age, $178.6{\pm}2.9cm$ in height) participated in a series of experiments. The second step was to design and suggest an integrated test method based on the results of the first experiment. As a result of the first experiment, we concluded that 1) the mobility and dexterity tests for firefighting gloves should include both wet and dry tests, 2) The three kinds of dexterity tests could be integrated into one test, and 3) The don-doff test and the torque test should be independent from the newly developed integrated test. In summary, we suggested a simplified test method that combined ASTM dexterity, Minnesota dexterity, and Bennett hand tool test. The integrated system can reduce total time spent on dexterity tests and improve the validity of the test in terms of firefighters' manual work.

• 인터넷정보학회논문지
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• 제14권1호
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• pp.31-39
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• 2013

새롭게 개발되는 소프트웨어 컴포넌트와 재사용되는 하드웨어 컴포넌트를 결합할 때, 두 컴포넌트간 인터페이스 불일치현상이 발생할 수 있다. 인터페이스 불일치 현상은 다양한 형태의 결함을 야기할 수 있으며 인터페이스 결함허용성을 저하시키는 요인이 된다. 하지만 이러한 결함에 대한 테스트는 경험기반으로 수행되기 때문에 사람에 매우 의존적이라는 단점이 있다. 이에 본 논문에서는 경험기반 테스트를 구조적 방법으로 접근하여 임베디드 소프트웨어의 인터페이스 결함허용성을 향상시킬 수 있는 기법을 제안한다. 먼저, 기존에 정의된 인터페이스 결함유형에는 포함되지 않았던 경험기반으로 수행되었던 인터페이스 결함유형을 정의한다. 다음으로 새롭게 정의된 인터페이스 결함 유형을 고려한 테스트 수행 방법을 제시한다. 제안한 방법의 우수성을 입증하기위해 본 논문에서는 상용 방송 수신단말기를 대상으로 테스트 수행한 결과, 기존에 사용했던 방법보다 7.9%의 심각한 결함을 추가로 발견할 수 있었다. 또한, 제안한 방법은 소프트웨어 개발 주기상에서 초기에 테스트 경로를 생성하기 때문에 개발자들이 사전에 인터페이스 불일치 결함을 발견할 수 있어 보다 효과적인 테스트 계획 수립이 가능하다.

• 대한기계학회논문집A
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• 제25권12호
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• pp.1995-2001
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• 2001

In this study, a small punch creep(SP-Creep) test using miniaturized specimen(10${\times}$10${\times}$0.5mm) is described to develop the new creep test method for high temperature structural materials. The SP-Creep test is applied to 2.25Cr-lMo(STBA24) steel which is widely used as boiler tube material. The test temperatures applied for the creep deformation of miniaturized specimens are between 550∼600$^{\circ}C$. The SP-Creep curves depend definitely on applied load and creep temperature, and show the three stages of creep behavior like in conventional uniaxial tensile creep curves. The load exponent of miniaturized specimen decreases with increasing test temperature, and its behavior is similar to stress exponent behavior of uniaxial creep test. The creep activation energy obtained from the relationship between SP-Creep rate and test temperature decreases as the applied load increases. A predicting equation or SP-Creep rate for 2.25Cr-lMo steel is suggested. and a good agreement between experimental and calculated data has been found.

• Journal of Information Technology Applications and Management
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• 제12권1호
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• pp.157-172
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• 2005

Recently, location-based service (LBS) is a hot issue in the field of computer applications. So many papers introducing new techniques of implementing a LBS and new application fields of LBS have been published recently. However, to the best of our knowledge, none of them discusses feasibility test in the prior to the implementation. The importance of a feasibility test for a design prior to the implementation cannot be overemphasized. This paper presents a method of feasibility test for a LBS design. Our method performs three steps. At the first step, we build a Petri net model of the LBS system which is depicted in natural language. The second step is to analyse the Petri net to find errors and flaws in the design. We also improve the Petri net model by fixing the errors and flaws in this step. A feasibility test is the third and final step. In this step. we verify if the design satisfies the user's requirement in the senses of quality of service (QoS) and of minimizing the implementation cost. The third step is performed in the manner of mathematical analysis of the Petri net.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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• pp.102-107
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• 1986

This paper presents a new idea to obtain moment of inertia values of an arbitrary shape body by applying inverse modal transformation technique. A multiaxes inertia pendulum apparatus was designed to measure 6 rigid body modes of a test body. A software was developed to calculate inertia properties as well as the location of center of gravity and total mass of the test body from the measured modal data. The developed method was applied to a simple body of which the inertia properties are known then the obtained values were compared with the known values.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2002년도 가을 학술발표회 논문집
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• pp.575-582
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• 2002

A new coupling method of Element-Free Galerkin Method(EFGM) and Boundary Element Method(BEM) using the domain decomposition method is presented in this paper. This proposed methodology is that the problem domain is decomposed into sub-domains being modeled by the EFGM and BEM respectively and the respective EFGM and BEM domains share a partially overlapped region over an entire domain. Then, the each sub-domain is separately computed and the variables on common region are iteratively updated until converging. It is an important note that in the developed coupling method, there is no need to combine the coefficient matrices of EFGM and BEM sub-domains, in contrast with the other conventional coupling methods. In the first part of this paper, a theory of EFGM and BEM is summarized, and then a brief introduction of domain decomposition method is described. Then, a new coupling method is presented. Also, patch test and Some numerical examples are studied to verify stability, accuracy and efficiency of the proposed method, in which numerical performance of the method is compared with that of conventional method such as EFGM-BEM variational coupling method, EFGM and BEM.

• Archives of Plastic Surgery
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• 제33권4호
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• pp.521-524
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• 2006

Purpose: The history of biometry dates back to ancient Greek. The ideal body ratio from biometry is used as a guideline in many works of art. Biometry is also used as a medical standard to determine normal or abnormal. Since the biometry of face is so complicated, many surgeons tend to regard preoperative evaluation as a bother and substitute medical records with some photographs. We introduce a new method to measure $MRD_1$ and levator function using digital photographs, which becomes widely used lately. Methods: $MRD_1$ can be measured with the primary-gaze-view photo which is magnified by PhotoshopR 7.0.1. The distance from coneal reflex of ring flash to upper eyelid margin is converted to mm-unit using the piece of ruler attached on the patient's face. Levator function can be measured with up-gaze-view photo and down-gaze-view photo which are superimposed on another. The excursion distance of upper eyelid margin (a) and the excursion distance of eyebrow (b) are measured respectively. The levator function can be assessed through subtraction of two values (a-b). This method is simple and precise and can be applied directly to patient without photos. Results: Using magnified digital photos and computer, this method can reduce personal error and instrumental error. Taking some digital photos doesn't take long time, so it can reduce the effort of preoperative evaluation and discomfort of patients. Conclusion: Digital photo-biometry is useful for retrospective study. Especially reducing personal error, it is useful when the number of specimens is huge. New levator function test is much more useful for Asian-specific eyes than Berke's method allowing frontalis muscle compensation.

• 대한방사선기술학회지:방사선기술과학
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• 제39권4호
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• pp.631-636
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• 2016

공간 분해능을 평가하기 위해서 이제까지는 일정하게 두 물체의 간격(이중 표적)을 근접한 것부터 점점 떨어진 간격으로 만들어진 테스트 패턴이나 팬텀을 이용하였다. 이러한 방법으로 공간분해능을 평가하면 분해능은 테스트용으로 제작된 팬텀에 있는 표적 간격으로 제한된다. 본 연구는 이러한 문제를 극복하고자 1개의 단일 표적으로 공간 분해능을 간편하게 측정할 수 있는 새로운 방법을 제안하고 검증한 것이다. 이를 위해 PSF 및 JND를 이용하여 공간 분해능을 추정하는 개념을 제시하였다. 이렇게 유도된 공간 분해능 추정 이론을 검증하기 위해, 상용 팬텀을 이용하여 실험하였다. 실험으로 얻어진 디지털 영상에서 라인 픽셀 프로파일을 구하기 위해 만든 LabVIEW 프로그램을 이용하여 분석한 결과, 본 연구에서 유도한 단일 표적을 이용한 공간 분해능 추정 이론과 실험적으로 일치하는 것을 알 수 있었다. 실험 결과로 디지털 영상에서 공간분해능의 상대적 평가는 단일 표적을 가지고도 충분하다는 것을 증명할 수 있었다. 따라서 단일 표적 공간분해능 평가법을 이용하면 이제까지 사용되어 왔던 이중 표적을 이용한 공간분해능 평가의 한계를 극복할 수 있다.

• 전기학회논문지
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• 제63권7호
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• pp.875-882
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• 2014

In this paper, we propose a new parameter estimation method that can deal with the data of multiple time intervals simultaneously. If there are common modes in the multiple time intervals, it is possible to create a new polynomial by summing the coefficients of the prediction error polynomials of each time interval. By calculating the roots of the new polynomial, it is possible to estimate the common modes that exist in each time interval. The accuracy of the proposed parameter estimation method has been proven by using appropriate test signals.

• Journal of information and communication convergence engineering
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• 제12권1호
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• pp.39-45
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• 2014

A numerical method for solving Hamiltonian equations is said to be symplectic if it preserves the symplectic structure associated with the equations. Various symplectic methods are widely used in many fields of science and technology. A symplectic method preserves an approximate Hamiltonian perturbed from the original Hamiltonian. It theoretically supports the effectiveness of symplectic methods for long-term integration. Although it is also related to long-term integration, numerical stability of symplectic methods have received little attention. In this paper, we consider explicit symplectic methods defined for Hamiltonian equations with Hamiltonians of the special form, and study their numerical stability using the harmonic oscillator as a test equation. We propose a new stability criterion and clarify the stability of some existing methods that are visually based on the criterion. We also derive a new method that is better than the existing methods with respect to a Courant-Friedrichs-Lewy condition for hyperbolic equations; this new method is tested through a numerical experiment with a nonlinear wave equation.