• 통상정보연구
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• 제16권5호
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• pp.295-315
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• 2014

본 연구에서는 원산지제도의 취약성, FTA 장벽, 원산지검증 수준, 원산지성과 간의 구조적 관계를 규명하였다. 이를 위해서 원산지제도를 수행하고 있는 104개 기업들을 대상으로 설문조사를 수행하고, 구조방정식모형(Structural equation model)을 통해 가설을 검증하였다. 먼저, 원산지제도의 취약성, FTA 장벽 요인을 선행변수로 두고, 원산지검증 요인을 매개변수로 설정하였다. 기업의 원산지성과 요인과 함께 연구모형에 포함시켜 실증분석을 한 결과 다음과 같은 연구결과를 얻었다. 첫째, 원산지제도의 취약성은 원산지검증 수준 요인에 부(-)의 영향을 미쳤다. 둘째, 원산지검증 수준은 원산지성과 요인에 정(+)의 영향을 미쳤다. 본 연구 결과를 통하여 기업들은 경쟁력을 강화시키기 위해서 먼저, 원산지규정에 대한 이해력을 높이고, 파트너 기업들과 공동으로 협업하여 대처해 나가는 방법으로 연구성과를 거두었다. 둘째, 물품의 원산지를 증명에 대한 프로세스를 구축하여 이를 시스템화하여 체계적으로 관리해야 한다는 결론을 얻었다. 향후 원산지검증 수준에 관하여 기업내부 요인과 외부 요인을 도출하여 기업의 대 내외적 수준을 평가할 수 있는 연구가 필요할 것이라고 판단된다.

• 대한조선학회 특별논문집
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• 대한조선학회 2017년도 특별논문집
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• pp.73-79
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• 2017

IACS enacted Harmonized CSR(CSR-H) to meet the IMO GBS applied from 1 July 2016. CSR-H is clearly complement and integrate than present CSR-BC & CSR-OT. One of the biggest issue in new rule is structural analysis. In CSR-H, structural analysis must carried out entire each cargo area including the aft bulkhead of the aftermost cargo hold and the collision bulkhead. Accordingly, new load and boundary conditions are present, an additional structural reinforcement is required by the structural analysis result for each cargo hold. In this study, we applied CSR-H to existing 158K DWT CLASS CRUDE OIL TANKER in order to compare and analyze the hull changes. It is useful for the application of the CSR-H to the similar vessel and helpful in finding the optimized structural design.

• Computers and Concrete
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• 제17권3호
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• pp.353-386
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• 2016

Realistic assessment of the performance of reinforced concrete structural members like columns is needed for designing new structures or maintenance of the existing structural members. This assessment requires analytical capability of employing proper material models and cyclic rules and considering various load and displacement patterns. A computer application was developed to analyze the non-linear, cyclic flexural performance of reinforced concrete structural members under various types of loading paths including non-sequential variations in axial load and bi-axial cyclic load or displacement. Different monotonic material models as well as hysteresis rules, were implemented in a fiber-based moment-curvature and in turn force-deflection analysis, using proper assumptions on curvature distribution along the member, as in plastic-hinge models. Performance of the program was verified against analytical results by others, and accuracy of the analytical process and the implemented models were evaluated in comparison to the experimental results. The computer application can be used to predict the response of a member with an arbitrary cross section and various type of lateral and longitudinal reinforcement under different combinations of loading patterns in axial and bi-axial directions. On the other hand, the application can be used to examine analytical models and methods using proper experimental data.

• Steel and Composite Structures
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• 제21권3호
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• pp.479-500
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• 2016

Seismic design criteria allow enhancing the structural ductility and controlling the damage distribution. Therefore, detailing rules and design requirements given by current seismic codes might be also beneficial to improve the structural robustness. In this paper a comprehensive parametric study devoted to quantifying the effectiveness of seismic detailing for steel Moment Resisting Frames (MRF) in limiting the progressive collapse under column loss scenarios is presented and discussed. The overall structural performance was analysed through nonlinear static and dynamic analyses. With this regard the following cases were examined: (i) MRF structures designed for wind actions according to Eurocode 1; (ii) MRF structures designed for seismic actions according to Eurocode 8. The investigated parameters were (i) the number of storeys; (ii) the interstorey height; (iii) the span length; (iv) the building plan layout; and (v) the column loss scenario. Results show that structures designed according to capacity design principles are less robust than wind designed ones, provided that the connections have the same capacity threshold in both cases. In addition, the numerical outcomes show that both the number of elements above the removed column and stiffness of beams are the key parameters in arresting progressive collapse.

• Journal of the Korean Wood Science and Technology
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• 제24권1호
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• pp.11-16
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• 1996

The purpose of this paper is to present a summary of assignment design values according to domestic softwood structural lumber grading rules. Allowable stresses for visually graded lumber were determined from basic data on small. clear specimens. The data corrected for variability such as natural defects and other factors. The procedure adopted by Japan was used for assigning allowable design values. Strength ratios in relation to each defect were taken from ASTM D 245-81. Korean pine(Pinus koraiensis S. et Z.), Korean red pine(Pinus densiflora S. et Z.), Japanese larch(Larix leptolepis Gordon) and Needle fir(Abies holophylla Max) were applied to this study. The calculated allowable stresses were same in Korean pine and Korean red pine. These values were highest in Japanese larch lowest in Needle fir. So, it is desirable for these species to be classified into different catagories Species Group. However, accurate comparison in design values on lumber grading rules among U.S., Japan and Korea was somewhat difficult. And full scale testing will be necessary for accurate determination of the correction factors to setting up design values.

• 한국정보과학회논문지:소프트웨어및응용
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• 제30권12호
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• pp.1158-1171
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• 2003

UML은 객체지향 모델링에 있어서 표준으로 받아들여지고 있다. UML은 풍부한 구성요소를 가지므로 개발하고자하는 시스템을 상세하게 묘사할 수 있지만, 모델링된 다이어그램의 정확성과 일관성은 보장하지 못한다는 결점을 가진다. 따라서 개발프로세스의 초기단계에서 사용자 모델을 검증함으로써 오류를 최소화하는 것이 중요하다. 본 연구에서는 메타-메타모델과 OCL로 표현된 검증규칙을 이용하여 UML structural 다이어그램과 behavioral 다이어그램의 일관성을 검증하는 방법을 제안한다. 일관성은 하나의 요구사항을 가지고 작성된 structural 다이어그램과 behavioral 다이어그램이 일관성있게 작성되었는지를 판단하기 위한 성질이다. 검증의 첫 번째 작업으로서 UML 다이어그램과 그들사이의 관련요소로 표현된 메타-메타모델을 유도하고, 유도된 메타-메타모델로부터 일관성을 검증하기 위한 규칙을 유도하고, 유도된 검증규칙은 검증작업의 자동화를 위해 OCL과 같은 정형적인 언어로 명세한다. 마지막으로 사례모델을 통해 검증규칙의 유용성을 검증한다.

• 전기학회논문지
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• 제59권5호
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• pp.981-989
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• 2010

In this study, we introduce a new architecture of fuzzy inference system. In the fuzzy inference system, we use Fuzzy C-Means clustering algorithm to form the premise part of the rules. The membership functions standing in the premise part of fuzzy rules do not assume any explicit functional forms, but for any input the resulting activation levels of such radial basis functions directly depend upon the distance between data points by means of the Fuzzy C-Means clustering. As the consequent part of fuzzy rules of the fuzzy inference system (being the local model representing input output relation in the corresponding sub-space), four types of polynomial are considered, namely constant, linear, quadratic and modified quadratic. This offers a significant level of design flexibility as each rule could come with a different type of the local model in its consequence. Either the Least Square Estimator (LSE) or the weighted Least Square Estimator (WLSE)-based learning is exploited to estimate the coefficients of the consequent polynomial of fuzzy rules. In fuzzy modeling, complexity and interpretability (or simplicity) as well as accuracy of the obtained model are essential design criteria. The performance of the fuzzy inference system is directly affected by some parameters such as e.g., the fuzzification coefficient used in the FCM, the number of rules(clusters) and the order of polynomial in the consequent part of the rules. Accordingly we can obtain preferred model structure through an adjustment of such parameters of the fuzzy inference system. Moreover the comparative experimental study between WLSE and LSE is analyzed according to the change of the number of clusters(rules) as well as polynomial type. The superiority of the proposed model is illustrated and also demonstrated with the use of Automobile Miles per Gallon(MPG), Boston housing called Machine Learning dataset, and Mackey-glass time series dataset.

• 한국해양공학회지
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• 제19권1호
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• pp.71-76
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• 2005

This paper describes basic structural design for the large floating crane barge of fixed undulation type. Structural analysis was performed separately after dividing the floating crane into two parts, The crane part was composed of jib boom, back stay and back tower and the barge part supported the crane part. The structural strength for jib boom structural members are in compliance with JIS B 8821 and scantling of all barge structural members are in compliance with the requirement of KR (Korean Register of Shipping) Steel Barges and Rules for Classification of Steel Ships. For the structural analysis of large floating crane, MSC/NASTRAN and MSC/PATRAN software were used.

• 대한조선학회논문집
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• 제43권1호
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• pp.75-86
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• 2006

The scantling and structural design work is done during the initial stage in yacht design. This paper studies a procedure of the structural design for yacht with an illustrative design. Scantling of structural members and loads are defined based on the rules suggested by ISO(International Standard Organization) and ABS(American Bureau of Shipping). Also, FEA(Finite Element Analysis) model is presented for a practical guide for structural analysis. An equivalent structural element is used to simplify the composite material for the analysis.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2004년도 학술대회지
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• pp.42-47
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• 2004

This paper describes basic structural design for the large floating crane barge of fixed undulation type. Structural analysis is performed to divide two parts because crane barge is composed two parts, crane part of jib boom back stay and back tower and barge part to support crane part. The structural strength for jib boom structure members are in compliance with JIS B 8821 and scantling of all barge structural members are in compliance with the requirement of KR (Korean Register of Shipping) Steel Barges and Rules for Classification of Steel Ships. For the structural analysis of large floating crane, MSC/NASTRAN & MSC/PATRAN software is used.