A New Interfacial Model for Transverse Mechanical Properties of Unidirectional Fiber Reinforced Composites

Deng’an Cai,Xiaopei Wang,Yaohui Shi,Xufeng Hao,Yuan Qian,Guangming Zhou 한국섬유공학회 2021 Fibers and polymers Vol.22 No.2

Transverse mechanical properties play an important role in the study of fiber reinforced composite materials. Anexperimental and numerical study on mechanical properties and damage behavior of unidirectional fiber reinforcedcomposites under transverse load is presented. The quasi-static tensile and compressive tests were carried out to obtainmechanical properties of unidirectional fiber reinforced composites under transverse tension and compression. The fracturemorphologies of the specimens were observed by scanning electron microscopy (SEM) to reveal their distinct damagemechanism. Considering the effects of interface, a new interfacial model is proposed. Two representative volume elements(RVEs) of basic and interfacial models are established for comparison analysis. The predicted results agree well with theexperimental data. The introduction of interfacial layer has little effect on the prediction of transverse modulus, but canimprove the accuracy of the predicted transverse strength. The fiber volume fraction has a great influence on the transversemechanical properties of unidirectional fiber reinforced composites. As the fiber volume fraction increases, its transversemodulus increases, but both the transverse strength and the ultimate strain decrease.

Against AIDS : Economic Analysis on Chinese Rural Women

Deng Dasong,Ling Zhang Research Institute of Asian Women Sookmyung Women' 2005 Asian Women Vol.21 No.-

The Chinese government has realized that the spread of HIV/AIDS will finally set off the fruits of economic development. The disease begins from the weak, and then spreads quickly to every stratum of the population, which leads to irremediable shortage of human resources and eventually the stagnation and even retrogression of economic growth. The difficulty to control it is that this incurable disease will go into human social behavior, grow in the weak links of the society and entangle many other problems into a complicated vicious circle. Poverty, ignorance and indifference upon the weak have become the main reasons for the rapid spread of AIDS. Therefore, AIDS is regarded as the adjunct of social injustice, and consequently the protection of the weak has been attached unprecedented importance. At present, the spread of AIDS in China is wide spread in some places and among special groups. The AIDS patients are mainly from the rural areas, since drug abusers, prostitutes and those who sell blood are also mainly concentrated in the rural areas. Women, the most vulnerable group, are at the beginning of the vicious circle. The vulnerable position of rural women makes them the group most easily infected by AIDS and then the new source of infection. To effectively control the spread of the disease, it is necessary to attach great attention to this vulnerable group and provide them with effective help. This paper, after analyzing the vulnerability of Chinese rural women, points out the importance of maintaining social justice and protecting the vulnerable groups in preventing the spread of HIV/AIDS in China.

기존도심 활성화사업의 기초적 평가와 개선방안에 관한 연구 : 대전광역시 기존도심 활성화사업을 중심으로 Basic Evaluation and Improvement

오덕성,염인섭 대한건축학회 2004 대한건축학회논문집 Vol.20 No.5

At present there happen to be unbalanced development between old town center and urbanized areas. Therefore we tried to make efforts to solve the problem of the declined town centers through the urban regeneration projects and programs The urban regeneration is a comprehensive and integrated vision and action which leads to the resolution of urban problems and which seeks to bring about a lasting change n economic, physical, social and environment condition of area that has been subject to change. With these consideration in mind, we focused on the basic evaluation of urban regeneration strategies in old-town center. The purpose of this study is to find out characteristic and system of strategies in urban regeneration project, and to evaluate by using the post-evaluation framework(① strategic objectives, ②inputs and expenditure, activity measures output and outcome measures, ③gross and net impact measures). The analysis of regeneration project in Daejeon metropolitan city consists of following 3 parts: First we extract factors of the urban decline in terms of 3aspects in the urban regeneration(physical-environmental),second we have the measurement and monitoring of progress and the evaluation of urban regeneration strategies in project Third we find out the relation between the 3 aspects and projects in the urban regeneration The evaluation is concerned and efficiency are interrelated issues in evaluation.

재무제표 정보를 이용한 비정상 수익률의 예측

이찬기,고동원 천안대학교 2002 천안외국어대학논문집 Vol.- No.2

This paper predicts to abnormal return by using accounting information in the Korean Stock Market. The use of forecasting model of relevant accounting information system if helpful to change the investment method used the financial statement, core of accounting information. For this purpose, the univariate, correlation, and the regression analysis were performed using approach. The empirical results show that the R&D and IMF(dummy) variable exhibited abnormal returns. The research shows that we can get excess stock returns over the average market rate of returns when follow investment decision by R&D and IMF(dummy) variable.

센서 어레이를 이용한 휘발성유기화합물 측정기기 개발

홍철호,김동진,이장훈,권혁구 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.1

Air quality monitoring is a primary activity for industrial and social environment. The government push for pollutants that must be monitored. Especially, the VOCs(Volatile Organic Compounds), which are very harmful for human and environment, should be controlled under the government policy. We have been developed a VOCs measurement system which recognize various kinds and quantities of VOCs, such as benzene, toluene, and xylene(BTX). Especially, we designed sensor array with various kinds of gas sensor and ANN(Artificial Neural Network) algorithm. The measured values for BTX have errors of 1~4ppm.

The Naive Bayesian Algorithm-based Prisoner’s Dilemma Game Model

Xiuqin Deng,Jiadi Deng 보안공학연구지원센터 2014 International Journal of u- and e- Service, Scienc Vol.7 No.6

Prisoners’ dilemma is a typical game theory issue. In this study, it was treated as an incomplete information game to establish a related machine learning model using a naive Bayesian classification method. The model established was referred to as the Bayes model. Using this model, the incomplete information game was soluble with the assistance of statistical machine learning. This study proceeded as follows: firstly, four typical models were run against the Bayes model some 10,000 times. The total incomes of the models recorded suggested that Bayes model was more advantageous than other models. Even in a multi-player prisoners’ game, Bayes model also presented the desired level of performance and accrued a higher income than other models. Further statistical analysis implied that the Bayes model and the widely accepted optimum strategy tit-for-tat (TFT) model showed a tendency to be prone to defection. Secondly, according to the games run on the natural Bayes model, as well as the natural TFT model, it was found that the Bayes model accrued more benefits than the TFT model on average. Finally, comparison of the Bayes model with the TFT model revealed that the Bayes model was better. This demonstrated the efficacy of the Bayes model constructed in this study and moreover, provided a novel idea for solving the problem of an incomplete information game.

The genus Cephonodes from Xisha islands, Hainan Province, China, with description of a new species Cephonodes sanshaensis Deng & Huang, 2023 sp. nov. (Lepidoptera: Sphingidae)

Min Deng,Min Wang,Chao Tang,Bo Cai,Guangchang Ma,Xingwang Jiang,Guo-Hua Huang 국립중앙과학관 2024 Journal of Asia-Pacific Biodiversity Vol.17 No.1

A new species, Cephonodes sanshaensis Deng & Huang, sp. nov. is described from Xisha islands nearSansha City, China. Photographs of the adults and their genitalia are provided. The new species is similarto C. hylas (Linnaeus, 1771) and C. picus (Cramer, 1777) but can be easily distinguished by characters in themale genitalia: the right lobe of the uncus is hook-shaped with distinctly acute apex, the left valva is longand narrow with a truncate apex, and the right valva is broad and knife-shaped. Molecular analysis basedon cytochrome c oxidase I gene barcode sequences is used to infer the phylogenetic position of the newspecies within the genus Cephonodes. An updated key and checklist to the worldwide species of thegenus Cephonodes are also provided.

전통문화를 반영한 중국 현대 주얼리 스타일의 이미지 평가 연구

이등등(Li, Deng Deng),성광숙(Sung Kwangsook) 한국일러스아트학회 2023 조형미디어학 Vol.26 No.1

Experimental Investigation on Energy Mechanism of Freezing-Thawing Treated Sandstone under Uniaxial Static Compression

Hongwei Deng,Songtao Yu,Junren Deng,Bo Ke,Feng Bin 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.5

To gain a further understanding of Freeze-Thaw weathering effect on the damage of sandstone from the perspective of energy analysis, uniaxial static compression tests were conducted on sandstone samples that suffered 0, 20, 60, 100 and 140 freezingthawing cycles. Then total input strain energy, releasable elastic strain energy, dissipated energy and freezing-thawing induced damage of samples under uniaxial static compression tests were calculated and analyzed. In the mean time, the energy absorption of sandstone under dynamic loading tests (SHPB (Split-Hopkinson pressure bar) experiments) were cited and made a contrast with the dissipated energy of samples under uniaxial static compression tests. The results show that the tangent modulus, total input strain energy, releasable elastic strain energy and dissipated energy of samples decrease with Freezing-Thawing cycles go on, while the freezing-thawing induced damage grow with freezing-thawing cycles increase. In term of energy used for destroying rock samples in different test modes, less energy is needed for destroying samples in uniaxial static compression tests and it decreases with F-T cycles increase, while more energy is needed for destroying samples in dynamic impact loading and it increases with F-T cycles increase. In addition, the number of fragments of broken sample increase with the F-T cycles both in uniaxial static compression tests and dynamic loading tests, and sample under dynamic loading tests is more broken than sample under uniaxial static compression tests.

Diverse nectar robbers on Alpinia roxburghii Sweet (Zingiberaceae)

Xiaobao Deng,Wen Deng,Alice Catherine Hughes,Dharmalingam Mohandass 국립중앙과학관 2015 Journal of Asia-Pacific Biodiversity Vol.8 No.3

This study records for the first time three mammal species as nectar robbers on the ginger Alpinia roxburghii Sweet. We examined the behavior of nectar robbers and compared with earlier studies on a single plant species. We recorded seven species of nectar robbers: three squirrels, one bird, and three bees. Timing of robbing nectars were similar; however, robbing behavior differed among robbers. In particular, squirrels damaged the flower parts while robbing the nectar.