• Journal of International Society for Simulation Surgery
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• 제1권2호
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• pp.90-94
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• 2014

Reconstruction of the mandible after ablative oral cancer surgery requires esthetic and functional rehabilitation. Restoring facial symmetry and dentition need accurate preoperative surgical planning and meticulous surgical technique. Free fibular flap is most useful tools to reconstruct mandible because of its adequate length and height, simultaneous harvest of soft and hard tissues and placing dental implants. In this case report, recurred squamous cell carcinoma in the right mandible had been resected and free fibular flap was utilized for mandible reconstruction using 3D rapid prototype. Simulation surgery before dental implant placement has been performed for esthetic and functional prosthodontics.

• 해양환경안전학회지
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• 제2권1호
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• pp.77-82
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• 1996

Subsea pipelines are exposed to several potential risks of damage due to wave, soil instability and other hazards. Structural failure of the steel pipelines will result in serious consequences such as release of transported hydrocarbons, pollution to the ocean environment and heavy costs due to repair. This paper examines the safety of subsea pipelines with free span which is one of high potential damages. The variation of an allowable length of static free span is examined for different boundary conditions and is given in a curve which is useful for the dsign of the subsea pipeline with a free span.

• International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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• 제3권1호
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• pp.49-55
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• 2000

Improvement was made on the free span analysis of the offshore pipelines. The effect of axial force (both tension and compressive force) can be explicitly applied to the current design code. The closed form solutions of beam-column equation were derived for the typical boundary conditions. The solutions can be used to find the natural frequencies of the span using the energy balance concept. The results can be applied to the current design code and will result more realistic calculation of free span lengths of offshore pipelines.

• Structural Engineering and Mechanics
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• 제71권5호
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• pp.459-467
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• 2019

In this paper, hyperbolic shear deformation theory is used for free vibration analysis of piezoelectric rectangular plate made of porous core. Various types of porosity distributions for the porous material is used. To obtain governing equations of motion, Hamilton's principle is used. The Navier's method is used to obtain numerical results of the problem in terms of significant parameters. One can conclude that free vibration responses are changed significantly with change of important parameters such as various porosities and dimensionless geometric parameters such as thickness to side length ratio and ratio of side lengths.

• Structural Engineering and Mechanics
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• 제82권6호
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• pp.747-756
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• 2022

This study presents the nonlinear free and forced vibrations of a cracked atomic force microscopy (AFM) cantilever by using the modified couple stress. The cracked section of the AFM cantilever is considered and modeled as rotational spring. In the frame work of Euler-Bernoulli beam theory, Von-Karman type of geometric nonlinear equation and the modified couple stress theory, the nonlinear equation of motion for the cracked AFM is derived by Hamilton's principle and then discretized by using the Galerkin's method. The semi-inverse method is utilized for analysis nonlinear free oscillation of the system. Then the method of multiple scale is employed to investigate primary resonance of the system. Some numerical examples are presented to illustrate the effects of some parameters such as depth of the crack, length scale parameter, Tip-Mass, the magnitude and the location of the external excitation force on the nonlinear free and forced vibration behavior of the system.

• 한국콘텐츠학회논문지
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• 제17권9호
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• pp.363-374
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• 2017

본 연구는 금연 캠퍼스와 흡연허용 캠퍼스에서 재학하고 있는 대학생들의 캠퍼스 내 외 금연정책에 대한 수용성 정도를 파악함으로써 대학 캠퍼스 금연정책 도입을 위한 기초자료를 제공하고자 실시된 조사연구이다. 금연 캠퍼스와 흡연 허용 캠퍼스에서 재학하고 있는 대학교 1학년 학생들의 캠퍼스 내 외 금연정책 수용성 변화를 탐색하기 위하여 입학 시인 2016년 3월에 사전조사를 실시하였고, 9개월 후인 12월에 사후조사를 실시하였다. 연구결과는 금연 캠퍼스와 흡연허용 캠퍼스 신입생들의 캠퍼스 내 금연정책에 대한 수용성은 입학 시와 9개월 후 조사된 자료를 비교한 결과 차이가 없는 것으로 나타났다. 또한 금연 캠퍼스에 재학하는 신입생들에서는 정부의 공공시설 금연정책에 대한 수용성이 변화되지 않았으나 흡연허용 캠퍼스에 재학하는 신입생에서는 정부의 공공시설 금연정책에 대한 수용성 정도가 낮아진 것으로 나타났다. 본 연구결과는 대학 행정자들이 대학 내 보다 강력하고 일관된 금연정책을 채택하는데 긍정적으로 작용할 수 있으며 이러한 금연 캠퍼스 정책을 시행할 경우 대학의 캠퍼스 내 금연정책과 정부의 금연정책 수용성에 긍정적인 영향을 줄 것으로 기대할 수 있을 것이다.

• 한국경영과학회지
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• 제33권1호
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• pp.107-115
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• 2008

We consider the discrete-time GI/G/1/K queue under the early arrival system. Using a modified supplementary variable technique(SVT), we obtain the distribution of the steady-state queue length. Unlike the conventional SVT, the modified SVT yields transform-free results in such a form that a simple two-moment approximation scheme can be easily established.

• 대한기계학회논문집
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• 제2권1호
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• pp.27-30
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• 1978

Conditions for increasing heat transfer by increasing uniform circular fin length are investigated. When free end of the fin is not thermally insulated, correction fin length, which gives equal heat transfer from an insulated end fin, is given. Optimum design of a uniform circular fin based on the equivalent fin with insulated end is given.

• 대한산업공학회지
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• 제42권5호
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• pp.304-313
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• 2016

This work suggests a new analysis approach for a discrete-time GI/G/1 queue with multiple vacations. The method used is called a modified supplementary variable technique and our result is an exact transform-free expression for the steady state queue length distribution. Utilizing this result, we propose a simple two-moment approximation for the queue length distribution. From this, approximations for the mean queue length and the probabilities of the number of customers in the system are also obtained. To evaluate the approximations, we conduct numerical experiments which show that our approximations are remarkably simple yet provide fairly good performance, especially for a Bernoulli arrival process.

• 대한수학회지
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• 제39권6호
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• pp.963-973
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• 2002

We study torsion phenomena in the integral cohomology of finite if-spaces X through the Eilenberg-Moore spectral sequence converging to H＊($\Omega$X; Z$_{p}$). We also investigate how the difference between the Z$_{p}$-filtration length f$_{p}$(X) and the Z$_{p}$-cup length c$_{p}$(X) on a simply connected finite H-space X is reflected in the Eilenberg-Moore spectral sequence converging to H＊($\Omega$X;Z$_{p}$). Finally we get the following result: Let p be an odd prime and X an n-connected finite H-space with dim QH＊ (X;Z$_{p}$) $\leq$ m. Then H＊(X;Z) is p-torsion free if (equation omitted).tion omitted).