• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.491-495
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• 2015

This paper aims to provide some unique insights into the verification of organisational innovation diffusion through empirically identifying the major factors determining the level of organisational innovation diffusion. The paper presents a two-stage sequential mixed method analysis: structural equation modelling analysis and regression analysis. A questionnaire survey was administrated to a sample of 223 organisations operating in Saudi Arabia. The results suggest that participative culture and, technology availability and implementation would intensify organisational climate for innovation. The results revealed compelling evidence in support of the moderating role of technology on the relationship between country socio-culture and organisational climate for innovation. Equally important, organisational innovation characteristics could play a crucial role in the intention to adopt a particular innovation. Specifically, maintaining Saudi Arabian top management's status quo is an obstacle to organisational innovation diffusion. This paper expands and improves upon the current understanding of how organisational innovation diffusion, in particular the Project Management Office (PMO), can be accelerated. By focusing on the critical factors within the conceptual model, the paper depicts the crucial role of certain factors that could leverage improved organisational innovation diffusion outcomes.

• 한국정보처리학회논문지
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• 제6권2호
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• pp.307-314
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• 1999

본 논문에서는 순차 언어로 작성된 프로그램을 '병렬화'와 지역성 향상'을 목적으로 변형시키는 최적화 기법에 대해서 논의한다. 의존성과 지역성을 고려하여 순차 프로그램의 루프 구조를 분석하고, 루프 분산과 루프 병합 기법을 적용하여 프로그램을 변형시킨다. 이 변형된 프로그램은 쉽게 '굵은 단위'의 병렬성과 지역성이 향상된 형태의 쓰레드 프로그램으로 표현될 수 있다. 따라서 이 변형 기법은 최적화/자동병렬화 컴파일러 구현에 유용하게 응용될 수 있다. 4개의 SPARC 프로세서를 장착한 Solaris 시스템에서 이 기법을 SPEC95 프로그램에 적용하여 시험한 결과 순차프로그램과는 20∼62%, 기존의 SUIF 병렬화 컴파일러와는 3∼12% 정도의 수행시간이 개선되는 효과를 얻게 되었다.

• 국제강구조저널
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• 제18권5호
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• pp.1710-1722
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• 2018

Investigating remained damages from terrible earthquakes, it could be concluded that some events including explosion because of defect and failure in the building mechanical facilities or caused by gas leak, firing, aftershocks, etc., which are occurred during or a few time after the earthquake, will increase the effects of damages. In this paper, by introducing a complete risk analysis which included direct and indirect risks for earthquake (the main shock) and aftershock, the corresponding robustness index was created that called as "robustness index sequential critical events risk-based". One of the main properties of the intended robustness index is using progressive collapse percentage in its evaluation. Then, in a numerical example for a 4-storey moment resisting steel frame structure, a method is presented for obtaining all effective parameters in robustness index evaluation based on the intended risk and at last its results were reported.

• Structural Engineering and Mechanics
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• 제9권2호
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• pp.111-126
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• 2000

Truss type structures are attractive to a variety of engineering applications on earth as well as in space due to their high stiffness to mass ratios and ease of construction and fabrication. During the service life, an individual member of a truss structure may lose load carrying capacity due to many reasons, which may lead to collapse of the structure. An analytical and computational procedure has been developed to study the response of truss structures subject to member failure under static and dynamic loadings. Emphasis is given to the dynamic effects of member failure and the propagation of local damage to other parts of the structure. The methodology developed is based on nonlinear finite element analysis technique and considers elasto-plastic material nonlinearity, postbuckling of members, and large deformation geometric nonlinearity. The pseudo force approach is used to represent the member failure. Results obtained for a planar nine-bay indeterminate truss undergoing sequential member failure show that failure of one member can initiate failure of several members in the structure.

• 드라이브 ㆍ 컨트롤
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• 제19권1호
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• pp.26-33
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• 2022

This study dealt with a self-propelled spinach harvester, which is capable of carrying out sequential harvesting work. This study aimed to find the cause of the harvester's occasional performance deterioration, which occurs in the process of simplifying the hydraulic circuit, using a multi-domain analysis model. The study was carried out in the following manner. First, a hydraulic system analysis model, which combines linear motion, rotary motion, hydrodynamic behavior, and an electrical signal, was developed through SimulationX software, specialized in multi-domain analysis. Second, a scenario for single behavior and coupled behavior was set out on an actuator basis. Third, the flow rate of the hydraulic system, which is not required for the movement of the actuator, was quantitatively analyzed. The results showed that a change in oil temperature was the cause of the harvester's occasional performance deterioration. And the higher the oil temperature, the more serious the performance deterioration, especially as the number of actuators operated simultaneously was small.

• 대한수학교육학회지:수학교육학연구
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• 제8권2호
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• pp.485-494
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• 1998

This study is on the theory of Piaget's reflective abstraction and the mechanism of the development of knowledge and the history of algebra and its application to understand the difficulties that many students have in learning algebra. Piaget considers the development of knowledge as a linear process. The stages in the construction of different forms of knowledge are sequential and each stage begins with reorganization. The reorganization consists of the projection onto a higher level from the lower level and the reflection which reconstructs and reorganizes within a lager system that is transferred by profection. Piaget shows that the mechanisms mediating transitions from one historical period to the next are analogous to those mediating the transition from one psychogenetic stage to the next and characterizes the mechanism as the intra, inter, trans sequence. The historical development of algebra is characterized by three periods, which are intra inter, transoperational. The analysis of the history of algebra by the mechanism explains why the difficulties that students have in learning algebra occur and shows that the roles of teachers are important to help students to overcome the difficulties.

• Computers and Concrete
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• 제27권2호
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• pp.143-152
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• 2021

Large dams are a part of the infrastructure of any society, and a huge amount of resources are consumed to build them. Among the various types of dams, the optimum design of concrete gravity dams requires special attention because these types of dams require a huge amount of concrete for their construction. On the other hand, concrete gravity dams are among the structures whose design, regarding the acting forces, geometric parameters, and resistance and stability criteria, has some complexities. In the present study, an optimization methodology is proposed based on Sequential Quadratic Programming (SQP), and a computer program is developed to perform optimization of concrete gravity dams. The optimum results for 45 concrete gravity dams are studied and regression analyses are performed to obtain some explicit formulas for optimization of the gravity dams. The optimization of concrete gravity dams can be provided easily using the developed formulas, without the need to perform any more optimization process.

• 한국강구조학회 논문집
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• 제10권1호통권34호
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• pp.125-135
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• 1998

본 연구에서는 내측지점의 상승 하강을 이용하여 부모멘트구간에 프리스트레스를 도입하는 3경간 연속 프리플렉스 합성형교의 설계방법을 제시하고 이를 전산 프로그램화하여 최적설계를 수행하였다. 최적설계를 위한 목적함수로는 3경간 연속 프리플렉스 합성형교의 재료비용으로 결정하고, 제약방정식은 설계과정 및 시방서에 명시된 최소 설계단면제원과 부재별 허용응력에 근거하여 구성하였다. 최적설계기법으로는 기존의 2경간 최적화 연구에서 제시된 수치적 최적화기법의 하나인 순차 비제약 최소화기법을 재검토 및 수정하여 설계를 수행하였다. 민감도분석 결과에 근거하여 지간길이에 따른 최적설계단면을 결정하고, 여기서 정해진 최종 설계단면을 단순보형 프리플렉스 합성형교의 설계단면과 비교하였다. 그리고 각 지간별 합성보의 형고를 변화시키면서 최적화를 수행하여 형고와 재료비용과의 관계도를 제시하고 최적형고를 결정하였다.

• 드라이브 ㆍ 컨트롤
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• 제19권1호
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• pp.69-75
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• 2022

This study aimed to develop solutions for the intermittent performance deterioration of self-propelled spinach harvesters through analysis model. The study was conducted in the following manner. First, changes in performance deterioration and surplus flow, which result from oil temperature changes, were analyzed by simulating actual sequential harvesting movements, which involve driving with actuators operated simultaneously, by analysis model developed in a previous study. Second, fundamental solutions for surplus flow problems were presented. Third, the solutions were applied to a virtual environment to present their practicality and quantitative effects. The two solutions based on the study results were as follows. First, a closed center-type directional control valve was applied to the hydraulic circuit. Second, an unloading system was set up through an on-off solenoid valve.

• 한국지반공학회논문집
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• 제15권3호
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• pp.161-176
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• 1999

본 논문에서는 기존의 불연속 변형 해석(DDA) 방법에 대한 세가지 방향의 새로운 개선 방법들이 제시되었다. 이 개선 방법들은 암반 균열에서 암석 블록과 지하수 흐름의 수리-역학적 커플링, 연속적인 하중 재하 또는 제하, 그리고 록볼트, 숏크리트와 콘크리트 라이닝에 의한 보강으로 구성되었다. Shi (1988)와 Lin (1995)에 의한 기존 DDA 프로.그램은 이 방법들에 의하여 추가로 개선되었으며, 이 새로운 DDA프로그램에 대한 몇 가지 적용예들이 제시되었다. 또한, 경부고속철도 공사의 일부인 운주 터널의 지하굴착에 대한 시뮬레이션을 통하여 절리를 통한 지하수의 흐름, 굴착순서, 그리고 록볼트와 숏크리트에 의한 보강이 터널안정에 미치는 영향을 연구하였다. 그 결과 절리를 통한 지하수의 흐름과 부적절한 굴착순서는 터널의 안정성에 악영향을 미치나, 한편 록볼트와 숏크리트에 의한 보강은 터널을 안정화 시킨다는 사실을 밝혀냈었다. 그 결과 세가지 개선방법이 추가된 DDA프로그램은 지하구조물 설계에 있어서 유용한 해석방법으로 사용될 수 있다는 사실을 보여주었다.