• Earthquakes and Structures
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• 제17권1호
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• pp.31-37
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• 2019

This work presents a free vibration analysis of functionally graded beams by employing an original high order shear deformation theory (HSDBT). This theory use only three unknowns, but it satisfies the stress free boundary conditions on the top and bottom surfaces of the beam without requiring any shear correction factors. The mechanical properties of the beam are assumed to vary continuously in the thickness direction by a simple power-law distribution in terms of the volume fractions of the constituents. In order to investigate the free vibration response, the equations of motion for the dynamic analysis are determined via the Hamilton's principle. The Navier solution technique is adopted to derive analytical solutions for simply supported beams. The accuracy and effectiveness of proposed model are verified by comparison with previous research.

• Fisheries and Aquatic Sciences
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• 제16권2호
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• pp.63-69
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• 2013

Shucked oysters were soaked in an equal weight of salt water and stored at $3^{\circ}C$ for 7 days. Changes in the free amino acid content of the whole body and in the adductor muscle were evaluated by a practical distribution method. With the exception of aspartic acid and tyrosine, no significant changes in free amino acids or ammonia were observed in whole-body shucked oysters during the storage period. In contrast, the majority of free amino acids in the adductor muscle decreased significantly. Most of these free amino acids were detected in considerable amounts in the surrounding salt water after 7 days of storage. Both the weight of the whole body and the salinity of the surrounding salt water decreased significantly during the storage period. These results suggest that free amino acids were eluted from the cutting surface of the adductor muscle and indicate that the free amino acid content per shucked oyster and in the adductor muscle, decreases during cold storage.

• 품질경영학회지
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• 제14권1호
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• pp.39-46
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• 1986

This paper considers two sided tests for exponential null distribution against NBUE or NWUE alternative in life testing. The main results concern the strong consistency of two proposed statistics, one being similar to Kolmogorov - Smirnov statistic, the other similar to Cramer-Von Mises statistic. Also obtained are the asymtotic null distribution and the exact Bahadur slope of the statistic similar to Kolmogorov-Smirnov.

• Communications for Statistical Applications and Methods
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• 제10권3호
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• pp.1007-1015
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• 2003

In this paper we introduced a new score generating function for the rank dispersion function in a general linear model. Based on the new score function, we derived the null asymptotic theory of the rank-based hypothesis testing in a linear model. In essence we showed that several rank test statistics, which are primarily focused on our new score generating function and new dispersion function, are mainly distribution free and asymptotically converges to a chi-square distribution.

• Journal of the Korean Statistical Society
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• 제36권4호
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• pp.447-456
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• 2007

On the basis of marginal likelihood of the residual vector which is free of nuisance mean parameters, we propose new Lagrange Multiplier seasonal unit root tests in seasonal autoregressive process. The limiting null distribution of the tests is the standardized ${\chi}^2-distribution$. A Monte-Carlo simulation shows the new tests are more powerful than the tests based on the ordinary least squares (OLS) estimator, especially for large number of seasons and short time spans.

• Journal of the Korean Data and Information Science Society
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• 제16권1호
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• pp.115-126
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• 2005

In this paper, we derive the approximate maximum likelihood estimators of the scale parameter and location parameter of the double exponential distribution based on Type-II censored samples. We compare the proposed estimators in the sense of the mean squared error for various censored samples.

• Archives of Reconstructive Microsurgery
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• 제5권1호
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• pp.35-45
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• 1996

After transplantation of groin free flap was sucessed by the Daniel and Taylor in 1973, the reconstruction of plastic surgery was extensive and universal due to rapidly developement of anatomic study of the donor site and technique of microvascular surgery. The free tissue transfers is possible to be early activity and rehabilitation by one stage operation. It currently available allow transfer of specific tissue quality as bone, muscle, nerve to achieve a functional and cosmetic result as well as the most favorable secondary defect. But free flaps require critical, skillful technique and lengthy operating time. Also it has disadvantage of donor site morbity at the large tissue transfer. Authors were transferred with 107 cases in 103 patients from May 1987 to June 1996, and then we analysed free tissue transfer to acquire more increased sucess rate, satisfactory functional and cosmetic results. The sexual distribution was male prominent in 79 cases(76.7%), female in 24(23.3%) and age was variable distribution from 3 to 76 years old. The cause of defects was most prevalent in trauma of traffic and industrial accident in 51 cases(49%). The common recipient site were lower extremities in 47 cases(43.9%), upper extremities in 28 cases(26.5%), head and neck in 25 cases(23.4%), and trunk in 7 cases(6.5%). The type of transfer were free skin flaps in 46 cases(43%), free muscle or musculocutaneous flaps in 31 cases(29%), free vasculized or osteocutaneous flaps in 10 cases(9.3%), and specilized free flaps in 20 cases(18.7%). The anastomosis of artery was end to end anastomosis in 94 cases(87.9%), end to side anastomosis in 13 cases(12.1%) and all vein was end to end anastomosis. The number of anastomosed vessels were one artery one vein in 62 cases(57.9%), one artery two vein in 45 cases(42.1%) and vein graft was performed only one case. The postoperative mornitoring were used with temperature, color of flap, capillary refilling time, ultrasonogram, bone scan, doppler, and endoscopy. The reexploration was performed in 9 cases(8.4%), and then flap was loss in 3 cases(2.8%). Accordingly overall success rate was 97.2%. The postoperative complication was early vascular occlusion, hematoma, partial necrosis and late bulkiness, scarring, color dismatch etc. Therefore, free tissue transfer is the preferred method of treatment, even through conventional local and distant flaps are available.

• 한국유통학회지:유통연구
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• 제12권3호
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• pp.1-21
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• 2007

본 연구는 최근 홍대 앞에서 정착되어 발전하고 있는 프리마켓을 소개한다. '프리마켓'은 작가나 작가 지망생들이 만든 예술적 창작품들이 거래되는 장소로 홍대 앞 놀이터에서 매주 토요일 열리는 장터이다. 본 연구는 프리마켓이라는 새로운 거래형태의 개념도출 및 설명을 위하여 프리마켓 구성원들과의 심층면접과 매장에서의 참여관찰을 통하여 자료를 수집하였고, 이를 토대로 프리마켓의 성장과정, 고유한 특징과 매장이 구성원에게 제공하는 새로운 경험적 가치를 정리하였다. 프리마켓은 90년대 일부 작가들이 길가에서 예술적 창작품들을 판매하기 시작하면서 자생적 노점상의 형태로 출발하였고, 2001년 벼룩시장과 예술시장의 성격이 혼합된 이벤트성 축제행사가 열리면서 성장의 기회를 갖게 되었으며, 2002년 신촌 문화포럼이 문화 중심의 시장을 기획하면서 지금의 프리마켓으로 발전되어 왔다. 현재 프리마켓은 자발적으로 참여하는 스텝, 참여 작가 및 일반 고객이 구성원이 되어 다양한 행사가 매주 토요일 정기적으로 개최된다. 프리마켓의 고유한 특징은 복합공간성과 역할의 무경계성으로 요약되고, 이러한 공간적 특징은 마켓에 참여하는 모든 구성원에게 자유로움, 경험의 비예측성, 사회적 교류, 참여적 역할을 통한 축제의 주인공이라는 새로운 경험적 가치를 제공하고 있다. 본 저자들은 이러한 가치를 기반으로 프리마켓이 새로운 매장 형태로 정착될 수 있었던 것으로 해석하였다. 따라서 본 연구는 프리마켓이라는 새로운 매장형태가 고객에게 고유한 경험적 가치를 제공한다는 의미를 도출하였고, 본 사례는 이러한 매장에서 고객에게 제공하는 고유한 경험적 가치가 향후 매장 경쟁력의 주요 원천이 될 수 있음을 시사하고 있다.

• 소성∙가공
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• 제8권1호
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• pp.92-100
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• 1999

A procedure is proposed for determining the initial thickness distribution in oder to produce a specified final thickness distribution for the axisymmetrical superplastic blow forming processes. Weighted parameter is introduced to improve the simple ad $d_traction method and the initial blank thickness distribution is obtained by optimizing the weighted parameter. This method is applied to superplastic free bulging process with the uniform thickness distribution of final shape to confirm its validity. The optimum initial blank thickness distributions is obtained from arbitrary axisymmetrical superplastic blow forming processes such as dome, cone and cylindrical cup forming with die contact. It is concluded that the ad $d_traction method with weighted parameter is an effective method for an optimum blank thickness distribution design.esign.

• 한국항만경제학회지
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• 제20권1호
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• pp.123-140
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• 2004

With the globalization of economy, there is keen competition among rountries to be a logistics hub and companies are striving to be first in establishing logistics system centering on advantageous sites, especially airport and seaports, to perform supply, production and distribution. Korea competing with Northeast Asia countries is also working out strategies in order to make Korea peninsula a logistics center of Northeast Asia taking advantage of its geographical strength. Gwangyang port has designated as Free Economic Zone together with Pusan and Jinhae, Incheon from October 24th, 2003. However, the introduction of Free Economic Zone in Korea lagged behind other major countries and it has a lot of operational problems. Approximately 600 areas worldwide are designated and operated as a Free Economic Zone and Gwangyang port and its surrounding area has several points to be settled as one of FEZ. First one is its limited functions and related laws. Next is imperfection on development, investment and management system of the hinterland. Lark of promotion activities could be one of the problems. This paper analyzes the above problems and presents various measures to activate Gwangyang Port and Gwangyang Free Economic Zone as follows Benchmarking to promote Gwangyang Free Economic Zone as follows Benchmarking other countries' system, governmental support, introduction & logistics functions, early development of the hinterland, supply of effective one-stop service, investment attraction into the area and diversified promotion & marketing activities.