• Wind and Structures
• /
• 제29권6호
• /
• pp.371-387
• /
• 2019

In the present paper, a simple refined nth-higher-order shear deformation theory is applied for the free vibration analysis of laminated composite plates. The proposed displacement field is based on a novel kinematic in which include the undetermined integral terms and contains only four unknowns, as against five or more in case of other higher-order theories. The present theory accounts for adequate distribution of the transverse shear strains through the plate thickness and satisfies the shear stress-free boundary conditions on the top and bottom surfaces of the plate, therefore, it does not require problem dependent shear correction factor. The governing equations of motion are derived from Hamilton's principle and solved via Navier-type to obtain closed form solutions. The numerical results of non-dimensional natural frequencies obtained by using the present theory are presented and compared with those of other theories available in the literature to verify the validity of present solutions. It can be concluded that the present refined theory is accurate and efficient in predicting the natural frequencies of isotropic, orthotropic and laminated composite plates.

• 정보관리학회지
• /
• 제22권1호
• /
• pp.209-228
• /
• 2005

본 연구는 정보시스템의 효율적인 협력적 상호작용을 가능하게 하는 정보자원의 관리 방안을 마련하기 위한 연구프로젝트의 선행 작업으로 진행되었다. 우선 본 연구는 협력적인 문제해결과정에서 발생되는 도움제공자와 도움수여자 간에 유의한 행위적${\cdot}$인지적 패턴이 존재하는지를 파악하고, 더 나아가 문제해결 상황에 대한 평가와 행위적${\cdot}$인지적 패턴 간에 유의한 관계가 존재하는지를 살펴보았다. 상황을 인지이동이 발생한 특정 시공간의 집합으로 보는 Dervin의 의미형성이론에 근거하였으며, IT관련 문제해결을 위해 정보전문가의 도움을 받았던 36명의 이용자와 이용자에게 도움을 제공한 경험이 있는 22명의 정보전문가를 대상으로 심층적인 인터뷰를 실시하였다. 협력적 문제해결 행위 모형을 제시하였고 정보시스템의 상호작용성을 향상시키기 위해 시스템 설계시 고려할 점을 제안하였다.

• 아태비즈니스연구
• /
• 제14권4호
• /
• pp.49-65
• /
• 2023

Purpose - In the Korean and Chinese social landscape, it is vital to appreciate the significance of the Japanese history problem. The current study investigated whether the perception of the Japanese history problem affects decisions regarding technology adoption in organizations by comparing South Korea and China. Design/methodology/approach - The study involved 305 Korean and 379 Chinese participants who responded to scenarios and surveys regarding the adoption of workplace surveillance cameras supplied by a Japanese company. Findings - Using a moderated mediation model based on protection motivation theory (PMT), we found that past experiences of privacy invasion significantly reduced trust in the adoption of surveillance cameras at work. This relationship was mediated by respondents' perceptions of security vulnerability. The current study, however, did not confirm any significant moderating effect of the Japanese history problem priming on trust in the adoption of workplace surveillance cameras. Research implications - This suggests that the Japanese history problem may have a limited impact on organizational technology adoption decisions, different from the political consumerism behavior driven by public anti-Japanese affectivity. The current study reaffirms the validity and applicability of PMT and provides both theoretical insights and practical recommendations.

• 한국학교수학회논문집
• /
• 제1권1호
• /
• pp.111-119
• /
• 1998

So far the studies on mathematical problem-solving education have failed to realize the anticipated result from students. The purpose of this study is to examine the reasons from the metacognitional viewpoint, and to think of making meta-items which enables learners to study through making effective use of the meaning of problem-solving and through establishing a general, well-organized theory on metacognition related to mathematic teaching guiedance. Metacognition means the understanding of knowledge of one's own and significance in the situation that can be reflection so as to express one's own knowledge and use it effectively when was questioned. Mathematics teacher can help students to learn how to control their behaviors by showing the strategy clearly, the decision and the behavior which are used in his own planning, supervising and estimating the solution process himself. If mathematics teachers want their students to be learners not simply knowing mathematical facts and processes, but being an active and positive, they should develop effective teaching methods. In fact, mathematics learning activities are accomplished under the complex condition arising from the factors of various cognition activities. therefore, mathematical education should consider various factors of feelings as well as a factor as fragmentary mathematical knowledge.

• 대한전기학회논문지:전력기술부문A
• /
• 제51권3호
• /
• pp.109-117
• /
• 2002

High accuracy of the load forecasting for power systems improves the security of the power system and generation cost. However, the forecasting problem is difficult to handle due to the nonlinear and the random-like behavior of system loads as well as weather conditions and variation of economical environments. So far. many studies on the problem have been made to improve the prediction accuracy using deterministic, stochastic, knowledge based and artificial neural net(ANN) method. In the conventional load forecasting method, the load forecasting maximum error occurred for the holidays on Saturday and Monday. In order to reduce the load forecasting error of the daily peak load for the holidays on Saturday and Monday, fuzzy concept and linear regression theory have been adopted into the load forecasting problem. The proposed algorithm shows its good accuracy that the average percentage errors are 2.11% in 1996 and 2.84% in 1997.

• 한국윤활학회:학술대회논문집
• /
• 한국윤활학회 2000년도 제31회 춘계학술대회
• /
• pp.3-10
• /
• 2000

The undesired situation of development of tribology and its reason is analyzed. The problem comes from insufficient study on the concept system and method system, which can match the name, definition and nature of tribology. The existence of three axioms in tribology is discussed. They are axiom of system dependent, axiom of time dependent and axiom of coupling of behaviors of multi-discipline. A series of lemmas has been deduced from three axioms. It is expected that they can be a foundation to establish the concept system and method system.

• 한국경영과학회:학술대회논문집
• /
• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
• /
• pp.476-480
• /
• 2002

The theory of constraints (TOC) has become a valuable system in modern operations management. Using the ideas and methods of the TOC, companies can achieve a large reduction of work-in-process and finished-goods inventories, significant improvement in scheduling performance, and substantial earnings increase. The purpose of this paper is to calculate the optimal size of the time buffer which is used to accommodate disruptions in production processes and provide maximum productivity of capacity constrained resources. After the problem formulation in terms of single server queueing model, we observed the system behavior by sensitivity analyses.

• 한국농공학회:학술대회논문집
• /
• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
• /
• pp.258-264
• /
• 1999

In this study, a computer program was developed for analysis of the orthotropic curved ring sector plates. In the developing program , the thin-plate theory and multi-base coordinate system was adopted. The effect of design factors-boundary conditions, loading conditions, steel ratio, open angle, radius of curvature and relative flexural rigidity between slab and edge-beam-on the behavior of the circular ring sector plates were discussed. Also, the practical limitations was proposed to replace the problem of the orthotropic sector plate by equivalent rectangular plage.

• 한국콘텐츠학회논문지
• /
• 제17권3호
• /
• pp.238-252
• /
• 2017

디지털 미디어 환경에서 개인은 직면한 기부이슈에 대하여 보다 능동적으로 정보를 취득하고 선택하며 전달하며 기부이슈를 심화, 확산시키기도 한다. 이러한 미디어 이용의 변화로 기부행동연구에 다른 관점의 접근이 필요하게 되었다. 개인들은 직면한 기부 문제에 대해 더 잘 알고자하는 동기에 의해 문제와 관련된 커뮤니케이션 행동을 할 가능성이 있다. 또한 잠재적인 기부자의 인식특성과 커뮤니케이션 특성의 관계를 이해하는 것은 기부요청 전략에도 도움이 될 것이다. 따라서 본 연구는 문제해결 상황이론을 토대로 인식과 지각된 도덕적 책임감, 예기된 죄책감이 희귀난치병 어린이 문제해결을 위한 커뮤니케이션 행동에 미치는 영향을 살펴보고자 하였다. 연구 결과, 희귀난치병 어린이에 대한 문제인식이 높고, 자신과 관련되어 있다는 관여인식이 크며 문제해결에 대한 제약인식이 낮을수록 희귀난치병 어린이 문제 해결에 대해 더 잘 알고자하는 상황적 동기화가 활성화되었다. 이어 문제해결에 대한 개인적 판단기준인 준거지침과 상황적 동기화는 문제해결을 위한 커뮤니케이션 행동(정보수용, 정보선별, 정보공유, 정보전파, 정보주목, 정보추구)에 구별된 영향을 주었다. 즉, 상황적 동기화는 여섯 정보행동 모두에 정적인 영향력이 있는 반면, 준거지침은 적극적 정보행동(정보선별, 정보전파, 정보추구)에만 정적인 영향을 주었다. 또한 추가된 변인인 지각된 도덕적 책임감과 예기된 죄책감 역시 상황적 동기화에 정적인 영향을 주는 것으로 나타나 기부행위 연구 맥락에서 문제해결 상황이론의 독립변인의 확장 필요성을 제기한 본 연구를 뒷받침하였다.

• Asian Pacific Journal of Cancer Prevention
• /
• 제17권8호
• /
• pp.3721-3725
• /
• 2016

The liver fluke Opisthorchis viverrini is a serious health problem in Thailand. Infection is associated with cholangiocarcinoma (CCA), endemic among human populations in northeast and north Thailand where raw fish containing fluke metacercariae are frequently consumed. Recently, Thailand public health authorities have been organized to reduce morbidity and mortality particularly in the northeast through O. viverrini and CCA screening projects. Health modification is one of activities included in this campaign, but systemic guidelines of modifying and developing health behavior among liver fluke and CCA prevention in communities towards health belief and social support theory are still various and unclear. Here we review the guidelines for modifying and developing health behavior among populations in rural communities to strengthen understanding regarding perceived susceptibility, severity, benefits, and barriers to liver fluke and CCA prevention. This model may be useful for public health officers and related organizations to further health behavior change in endemic areas.