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A novel hyperbolic integral-Quasi-3D theory for flexural response of laminated composite plates

  • Ahmed Frih;Fouad Bourada;Abdelhakim Kaci;Mohammed Bouremana;Abdelouahed Tounsi;Mohammed A. Al-Osta;Khaled Mohamed Khedher;Mohamed Abdelaziz Salem
    • Geomechanics and Engineering
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    • v.34 no.3
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    • pp.233-250
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    • 2023
  • This paper investigates the flexural analysis of isotropic, transversely isotropic, and laminated composite plates using a new higher-order normal and shear deformation theory. In the present theory, only five unknown functions are involved compared to six or more unknowns used in the other similar theories. The developed theory does not need a shear correction factor. It can satisfy the zero traction boundary conditions on the top and the bottom surfaces of the plate as well as account for sufficient distribution of the transverse shear strains. The thickness stretching effect is considered in the computation. A simply supported was considered on all edges of the plate. The plate is subjected to uniform and sinusoidal distributed load in the static analysis. Laminated composite, isotropic, and transversely isotropic plates are considered. The governing equations are obtained utilizing the virtual work principle. The differential equations are solved via Navier's procedure. The results obtained from the developed theory are compared with other higher-order theories considered in the previous studies and 3D elasticity solutions. The results showed that the proposed theory accurately and effectively predicts the bidirectional bending responses of laminated composite plates. Several parametric studies are presented to illustrate the various parameters influencing the static response of the laminated composite plates.

Stream of Confucianism and a Study of Dongmu Lee Jema's Formation of Sasang through Hado and Nock-seo, along with Four Character and Seven Feeling Theory (유학의 흐름과 하도낙서(河圖洛書) 및 사단칠정을 통한 동무(東武) 이제마(李濟馬)의 사상인 형성에 대한 연구)

  • Song, See-Won;Kang, Jung-Soo
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.19 no.1
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    • pp.29-37
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    • 2005
  • According to Confucianism, the world before Confucius focused on respecting the heaven which meant that everything could be done by the heaven. After the period of Confucianism, Joo-Ja asserted that everything could be done by nature. During the Chosun Dynasty, philosophers such as Seo Kyung-duck, Lee Hwang, and Lee Yi talked about four characters and seven passions of human being. They started to focus more on the inside of human nature. During the later period of the Chosun Dynasty, a philosopher by the name of Dongmugong Lee Jema analyzed that one's nature and feelings can change his or her external matter and the function of internal organs by purity or impurity of one's mind. Based on these analysis, Dongmugong discovered 'sasangin' which puts more emphasis on one's state of mind compared to the outside the world. Also, Dongmugong tried to figure out the connections between Confucianism and medical science. If you use change fire and stone theory which is difference between hado and nock-seo to expain four seven theory one's mind could be define as four natural characters and seven feelings. From four seven theory four is ying and seven is yang. This is the method of cure and understand the structure of human body. And also, four natural characters and seven feelings can be divided into heaven and earth. You can see Four natural characters is far more similar to heaven and seven feelings are similar to earth. According to four-seven theory hado is permanent and you can find out 'sasangin' is permanent also. Since seven feelings are influenced by sam-jae, you can analogize there are 21 different types in 'sasangin'. An underlying principle should there be 28 different types of sasangin instead of 21 different types of sasangin but one quater of sasangin is hidden according to samhyuniljang theory. All creations in the world are organized by unification of the great absolute and symmetry distinction of yingyang. With these facts identity of the heaven, earth and man which is named samjae generates symbols of independent sasang. And also, sasang generates relations between five element, six energy and the six family relation. From six family relation comes seven feelings of man which creates a category of the eight trigrams for divination and unification of nine palace. All these process are united.

Ultimate Strength of Concrete Barrier by the Yield Line Theory

  • Jeon, Se-Jin;Choi, Myoung-Sung;Kim, Young-Jin
    • International Journal of Concrete Structures and Materials
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    • v.2 no.1
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    • pp.57-62
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    • 2008
  • When the yield line theory is used to estimate the ultimate strength of a concrete barrier, it is of primary importance that the correct assumption is made for the failure mode of the barrier. In this study, a static test was performed on two full-scale concrete barrier specimens of Korean standard shape that simulate the actual behavior of a longitudinally continuous barrier. This was conducted in order to verify the failure mode presented in the AASHTO LRFD specification. The resulting shape of the yield lines differed from that presented in AASHTO when subjected to an equivalent crash load. Furthermore, the ultimate strengths of the specimens were lower than the theoretical prediction. The main causes of these differences can be attributed to the characteristics of the barrier shape and to a number of limitations associated with the classical yield line theory. Therefore, a revised failure mode with corresponding prediction equations of the strength were proposed based on the yield lines observed in the test. As a result, a strength that was more comparable to that of the test could be obtained. The proposed procedure can be used to establish more realistic test levels for barriers that have a similar shape.

The Analysis of Pant Style Trend to Establish a Fashion Cycle Theory: Focus on 1967 to 2012 (패션 주기 이론 구성을 위한 팬츠 스타일 트렌드 분석 -1967~2012년을 대상으로-)

  • Kim, Seonsook
    • Journal of the Korean Society of Clothing and Textiles
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    • v.37 no.6
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    • pp.786-798
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    • 2013
  • This study establishes a fashion theory frame to forecast future fashion cycles of pants through analyzing past fashion cycles of pants through a diachronic method. Pants pictures from 1967-2012, post-industrialized period of Korea were analyzed. Representative pant styles, fashion cycles of pants and the relation of pant styles, length and width were identified. The total of 1006 pictures in fashion magazine published over 46 years were selected and analyzed using PASW 18.0 (statistical program). The results are as follows. For 46 years, representative pant styles were skinny, regular and bell-bottom. The first cycle period was from 1969 to 1992 and lasted 24 years. The second cycle period was from 1993 to 2003 and lasted 11 years. The third cycle is ongoing as of 2004. Fashion cycles have shown a general trend to be shortened. The relation between pant styles, length and width revealed related results; in addition, pant length and width changed significantly in a similar orientation. Fashion marketers can develop successful products using fashion cycle theory from these results.

The Theory for Predicting the Moisture Distribution of Stored Grains

  • Murata, Satoshi;Kawao, Toshio;Nakano, Kohei;Kida, Tamaki
    • Proceedings of the Korean Society for Agricultural Machinery Conference
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    • 1993.10a
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    • pp.932-941
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    • 1993
  • High moisture content of barley seeds, which were carried to the laboratory within 10 minutes after harvest, were stored in air tight bottle at constant temperature, and the individual moisture contents the grains were measured at predecided tim intervals. The theory of predicting the moisture movement between two kinds of different moisture content grains was tried to apply to the prediction of the moisture distribution and tried to apply to the prediction of the moisture distribution and the comparison of the predicted values with the observed dta showed the good suitability of the theory. The shape of the moisture distribution predicted form the theory were similar to the observed ones for the temperature range of 10 to $50^{\circ}C$. This study will be useful in designing the mix-storage facility or dryer.

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The Core of Five Viscera Theory Created by Lee, Je-Ma (이제마(李濟馬)의 오장론(五藏論) 연구(硏究))

  • Bang, Jung-Kyun
    • Journal of Korean Medical classics
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    • v.20 no.2
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    • pp.195-200
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    • 2007
  • Lee Je-Ma's theory claimed Xin(心) as Qi(氣). But he also described Xin as Taiji(太極) in the center as if Xin combines LI(理) and Qi. Taiji is meant to be a residence of the body, but it does not mean that Xin equals Li. The relations between Xin and the remaining four viscera are similar to the relations between RenXin(人心) and DaeXin(道心) and Zhuzi's(朱子) theory in many respects. If the theory that Xin equals Daoxan and FeiPiGanShen(肺脾肝腎) equals RenXin is acceptable, the vertical relations between Xin and FeiPiGanShen can be explained. That is, Xin is explained as the controller of the body, and FeiPiGanShen acts as a subordinate serving Xin. In other words, the relations associated with Xin can explain physiological states of the body. When the Xin does not function normally, FeiPiGanShen cannot perform its roles and will have a negative impact on physiological functions of the body.

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A Method for Service Evaluation Based on Fuzzy Theory for Cloud Computing

  • Guo, Liangmin;Luo, Yonglong;He, Xiaokang;Hu, Guiyin;Dong, Yan
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.11 no.4
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    • pp.1820-1840
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    • 2017
  • Aiming at the phenomenon of false information issued by service providers in cloud computing environment, a method for service evaluation based on fuzzy theory is put forward in this paper. According to the quality of services provided by cloud service providers and their behavior during interactions, a trust relationship between cloud service providers and cloud service consumers is established, which can be quantified by using fuzzy theory. The quality of services is evaluated by drawing on the trust relationship. In our method, the recommendation credibility of a cloud service consumer is determined through behavior similarity with evaluators and a praise factor. The introduction of the praise factor better suits the phenomenon of a high-quality service getting more repeat customers. The negative impact of dishonest customers is reduced, and the accuracy of trust and cloud service quality evaluation is improved by introducing a confidence factor that can be dynamically adjusted. The experimental results show that our method can effectively and accurately evaluate the trust value and service quality of providers, while weakening the influence of dishonest consumers, and quickly detect dishonest service providers. This is beneficial for consumers trying to find high quality service providers for similar services.

A Study on the Meaning Construction and Expression Characteristics of Hybrid Design - Focus on the Methodology of Conceptual blending theory - (혼성 디자인의 의미구성과 표현특성에 관한 연구 - 개념적 혼성이론의 방법론을 중심으로 -)

  • Kim, Eun-Ji;Lee, Jeong-Wook
    • Korean Institute of Interior Design Journal
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    • v.15 no.2 s.55
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    • pp.81-90
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    • 2006
  • This treatise makes clear not only a structural methodology of 'the conceptual blending theory' using in a linguistics could be applied to the similar process in a hybrid design but also both methods include the same meaning construction in the sense of a mutual educational system. Both methods have something in common that they are fundamentally focused on a metaphorical expression which implies poetic messages to be concentrated on a formal structure. Therefore, the purpose of this treatise is to examine the structural characteristics in the hybrid design in order to analyze the rhetorical expressions(metaphor, allegory) as symbols of communication. One of the those is intertextuality that expresses metaphorically by blending and borrowing codes and another is hypertextual space where various texts twines around each other making brand-new and diverse organizations, as the combined allegory with a number of hidden expression. Ultimately, it is important that this approach could verify whether it deals the illogical present state of a spacial form or structure with a kind of mechanism of a 'conceptual blending theory' or not.

A study on the Direction of Forest Welfare Service Voucher System by Grounded Theory (근거이론을 이용한 산림복지서비스 이용권 제도 도입 방안 분석)

  • Cho, Han-Sol;Seo, Jeong-Weon;Kim, Seong-Hak
    • Journal of Korean Society of Rural Planning
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    • v.20 no.4
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    • pp.113-125
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    • 2014
  • After Forest Service formed a forest welfare service system by life cycle in 2008, they established a variety of policy for promoting welfare of the people. In Forest welfare service plan(2013~2017) which recently the forest service department established to along with government's welfare policy, they introduce forest welfare service voucher linked to National welfare system to provide forest welfare actively to disadvantaged citizen. The purpose of this study is to setup a direction of forest voucher system, and to make strategies of forest welfare service voucher by research existing voucher system of government. A study conducts a qualitative research by use grounded theory without a quantitative research, because there is not a lot of similar cases with forest welfare service voucher. The subject of this study is experts of National Park Authority 's voucher management, forest service's Nature recreation management and relevant researcher institution. The research is conducted by interviewing the subject and by using grounded theory analysis. After processing an opening coding, categorization of opening coding, and axis coding, induce a direction of the forest welfare service voucher system.

A Study on How to Strengthen the Expertise of Korean Qualifications Management in the Firefighting Realm from the Viewpoint of External Signal Dependency of Capture Theory

  • Kong, Ha-Sung;Lee, Min-Hi
    • International Journal of Advanced Culture Technology
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    • v.7 no.3
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    • pp.46-51
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    • 2019
  • This study suggests ways to strengthen the expertise by analyzing the problems caused by the lack of expertise of the qualification management body managing the Korean qualifications in the realm of firefighting from the perspective of external signal dependency of capture theory. As a method to prevent the dependency of external signals in capture theory, it is suggested to strengthen the expertise of regulators and strengthening roles and functions of regulator institutions by supplementing education and professional manpower. On this basis, analyzing the problems of qualifications management to the external signal dependency tendency, the researchers in qualification management at the Human Resources Development Service of Korea have a variety of different majors, so understanding and application can be limited if they are working in an unfamiliar area of work. Therefore, in making decisions regarding topics such as policies and roles, suitable alternatives should be found based on external signals. In order to improve this, it is necessary to select firefighting majors in the Korean qualification management of the firefighting realm, to reorganize the job scope to a similar job field of the researcher in charge. It is also necessary to strengthen the expertise of the researcher through various programs, such as mandatory periodic maintenance education in order to understand the work of the researcher.