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A unified Minorization-Maximization approach for estimation of general mixture models
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作者 HUANG Xi-fen LIU Deng-ge +1 位作者 ZHOU Yun-peng ZHU Fei 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2024年第2期343-362,共20页
The mixed distribution model is often used to extract information from heteroge-neous data and perform modeling analysis.When the density function of mixed distribution is complicated or the variable dimension is high... The mixed distribution model is often used to extract information from heteroge-neous data and perform modeling analysis.When the density function of mixed distribution is complicated or the variable dimension is high,it usually brings challenges to the parameter es-timation of the mixed distribution model.The application of MM algorithm can avoid complex expectation calculations,and can also solve the problem of high-dimensional optimization by decomposing the objective function.In this paper,MM algorithm is applied to the parameter estimation problem of mixed distribution model.The method of assembly and decomposition is used to construct the substitute function with separable parameters,which avoids the problems of complex expectation calculations and the inversion of high-dimensional matrices. 展开更多
关键词 MM algorithm mixed distribution model parameter estimation assembly decomposition tech-nology parameter separation
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A Complete Technique in Improving Quality and Production Efficiency of Juglans regia in Gongshan Derung and Nu Autonomous County
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作者 赵廷松 范志远 +5 位作者 腊叁富 邹伟烈 和玉德 潘莉 杜春花 刘娇 《Agricultural Science & Technology》 CAS 2017年第3期524-525,533,共3页
We applied water releasing from rootstocks technique and Juglans sigillata in Yangbi was pruned in the shape of opened-heart or round-heart shape. By bal- anced fertilization, survival rate of grafted walnuts can be i... We applied water releasing from rootstocks technique and Juglans sigillata in Yangbi was pruned in the shape of opened-heart or round-heart shape. By bal- anced fertilization, survival rate of grafted walnuts can be improved. We reviewed technologies to enhance walnut quality and production efficiency in Gongshan Derung and Nu Autonomous County for reference. 展开更多
关键词 Gongshan Juglans sigillata Quality and efficiency improvement tech-nology
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从技术主义到理想主义——全球化背景下上海世博会理念的建立 被引量:7
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作者 吴志强 邓小兵 《规划师》 2005年第2期75-78,共4页
19世纪的世博会主要以展示世界各国的科技实力为主题,20世纪下半叶世博会的主题则转向对太空、海洋的探索,上海2010年世博会具有独创性地提出了“城市”“生活”的概念,以“城市让生活更美好”为主题的世博会将为进入“城市时代”的人... 19世纪的世博会主要以展示世界各国的科技实力为主题,20世纪下半叶世博会的主题则转向对太空、海洋的探索,上海2010年世博会具有独创性地提出了“城市”“生活”的概念,以“城市让生活更美好”为主题的世博会将为进入“城市时代”的人类社会提供一个展示和交流的平台。 展开更多
关键词 上海世博会 城市 2010年世博会 全球化背景 理念 科技实力 展示 理想主义 世界各国 技术主义
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Endoscopic tools for the diagnosis and evaluation of celiac disease 被引量:5
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作者 Gianluca Ianiro Antonio Gasbarrini Giovanni Cammarota 《World Journal of Gastroenterology》 SCIE CAS 2013年第46期8562-8570,共9页
Celiac disease(CD)is an autoimmune disease of the small bowel induced by ingestion of wheat,rye and barley.Current guidelines indicate histological analysis on at least four duodenal biopsies as the only way to diagno... Celiac disease(CD)is an autoimmune disease of the small bowel induced by ingestion of wheat,rye and barley.Current guidelines indicate histological analysis on at least four duodenal biopsies as the only way to diagnose CD.These indications are based on the conception of the inability of standard endoscopy to make diagnosis of CD and/or to drive biopsy sampling.Over the last years,technology development of endoscopic devices has greatly ameliorated the accuracy of macroscopic evaluation of duodenal villous pattern,increasing the diagnostic power of endoscopy of CD.The aim of this paper is to review the new endoscopic tools and procedures proved to be useful in the diagnosis of CD,such as chromoendoscopy,Fujinon Intelligent Chromo Endoscopy,Narrow Band Imaging,Optical Coherence Tomography,Water-Immersion Technique,confocal laser endomicroscopy,high-resolution magnification endoscopy,capsule endoscopy and I-Scan technology. 展开更多
关键词 CELIAC disease MALABSORPTION syndrome DUODENUM Diagnostic techniques and proceduresEndoscopy CHROMOENDOSCOPY Fujinon intelligent chromo ENDOSCOPY Narrow band imaging Optical coherence tomography Water-immersion technique Confocal laser ENDOMICROSCOPY High-resolution mag-nification ENDOSCOPY Capsule ENDOSCOPY I-scan tech-nology
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OPKH: A Lightweight Online Approach to Protecting Kernel Hooks in Kernel Modules
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作者 田东海 李轩涯 +1 位作者 胡昌振 闫怀志 《China Communications》 SCIE CSCD 2013年第11期15-23,共9页
Kernel hooks are very important con- trol data in OS kernel. Once these data are com- promised by attackers, they can change the control flow of OS kemel's execution. Previ- ous solutions suffer from limitations in t... Kernel hooks are very important con- trol data in OS kernel. Once these data are com- promised by attackers, they can change the control flow of OS kemel's execution. Previ- ous solutions suffer from limitations in that: 1) some methods require modifying the source code of OS kernel and kernel modules, which is less practical for wide deployment; 2) other methods cannot well protect the kernel hooks and function return addresses inside kernel mo- dules whose memory locations cannot be pre- determined. To address these problems, we propose OPKH, an on-the-fly hook protection system based on the virtualization technology. Compared with previous solutions, OPKH off- ers the protected OS a fully transparent envi- ronment and an easy deployment. In general, the working procedure of OPKH can be di- vided into two steps. First, we utilise the me- mory virtualization for offiine profiling so that the dynamic hooks can be identified. Second, we exploit the online patching technique to in- strument the hooks for run-time protection. The experiments show that our system can pro- tect the dynamic hooks effectively with mini- mal performance overhead. 展开更多
关键词 kernel hook virtualization tech-nology online patching
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The Research on Competitive Technology Alliance Innovation Risk Formation Mechanism: A Resource-based and Capability-based View
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作者 CHEN Hong CHANG Yu +1 位作者 ZHANG Ding-ning ZHAN An-ling 《International Journal of Plant Engineering and Management》 2013年第2期111-119,共9页
Enterprises engaging in collaboration with competitors can increase their technological diversity and release a new product innovation, but also full of challenges. This complexity of co-opetition relationship require... Enterprises engaging in collaboration with competitors can increase their technological diversity and release a new product innovation, but also full of challenges. This complexity of co-opetition relationship requirements academia and enterprises to clarify the problem of competitive technology alliance risk formation mechanism, making the risk control to dispose. Based on the perspective of resources and capabilities, this paper firstly puts forward the double helix model of alliances' evolution on resources and capabilities ; then, with the deepe- ning of the cooperation, this evolutionary process leads to different innovation risk: opportunism, R and D inte- gration risk and flexible loss risk; next, analyzing the corresponding management path and constructing the conceptual framework of risk management mechanism to help enterprise using the co-opetition relationship to reduce risk and improve the potential competitive advantage. 展开更多
关键词 resource and capability perspective innovation risk generation mechanism the competitive tech-nology alliance
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Performance Evaluation of Motor Insurance Companies: Panel Data Evidence from Nigeria
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作者 G. U. Ugwuanyim D. E. Onwuegbuchunam +1 位作者 D. C. Bartholomew C. C. Anikpe 《Journal of Transportation Technologies》 2021年第3期325-334,共10页
This paper evaluated performance of motor insurance companies in Nigeria. The objectives were to determine the following: 1) significant effects of claims settlements on motor insurance firms’ earned premium;2) diffe... This paper evaluated performance of motor insurance companies in Nigeria. The objectives were to determine the following: 1) significant effects of claims settlements on motor insurance firms’ earned premium;2) differences in managerial/technological capabilities among the companies and 3) effects of policy (or time effect) on insurance firms’ output within the study </span><span style="font-family:Verdana;">period. Panel data obtained for this study comprised operational data on</span><span style="font-family:Verdana;"> premium earned and direct claims settlement by these companies over a period </span><span style="font-family:Verdana;">of six (6) years. Using panel data statistical models, we found that direct</span><span style="font-family:Verdana;"> claims settlement negatively affected insurance companies’ earned premium. Also, </span><span style="font-family:Verdana;">significant differences in technological and managerial capabilities were </span><span style="font-family:Verdana;">found to exist among the companies, though only one company exhibited this heterogeneity. Besides, there were no policy impacts (or time effect) on vehicle insurance firms’ output in the study period. Policy implications of the results were discussed. 展开更多
关键词 Motor Insurance Premium Earned Claims Settlement Managerial and tech-nological Performance Fixed Effects Regression
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