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cost-Efficient Edge Caching for NOMA-Enabled IoT Services

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China Communications 2024年第8期21卷 182-191页

作者： Chen Ying Xing Hua Ma Zhuo Chen Xin Huang Jiwei School of Computer Science Beijing Information Science and Technology UniversityBeijing 100101China Beijing Key Laboratory of Petroleum Data Mining China University of PetroleumBeijing 102249China

Mobile edge computing(MEC)is a promising paradigm by deploying edge servers(nodes)with computation and storage capacity close to IoT *** Providers can cache data in edge servers and provide services for IoT devices,which effectively reduces the delay for acquiring *** the increasing number of IoT devices requesting for services,the spectrum resources are generally *** order to effectively meet the challenge of limited spectrum resources,the Non-Orthogonal Multiple Access(NOMA)is proposed to improve the transmission *** this paper,we consider the caching scenario in a NOMA-enabled MEC *** the devices compete for the limited resources and tend to minimize their own *** formulate the caching problem,and the goal is to minimize the delay cost for each individual device subject to resource *** reformulate the optimization as a non-cooperative game *** prove the existence of Nash equilibrium(NE)solution in the game ***,we design the Game-based cost-Efficient Edge Caching Algorithm(GCECA)to solve the *** effectiveness of our GCECA algorithm is validated by both parameter analysis and comparison experiments.

关键词： caching cost Internet of Things mobile edge computing non-orthogonal multiple access

Estimation of the Direct cost of Management of Venous Thromboembolism in Three Reference Hospitals in the City of Yaoundé: A Retrospective Study over a Three-Year Period

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World Journal of Cardiovascular Diseases 2024年第2期14卷 99-114页

作者： Hamadou Ba Nganou-Ngnindjio Chris Nadège Tatchim Samuel Aimé Kamdem Félicité Tchoukoua Serge Honoré Ahmadou Jingi Danwe Dieudonne Kingue Samuel Faculty of Medicine and Biomedical Sciences University of Yaoundé I Yaoundé Cameroon Department of Internal Medicine Garoua General Hospital Garoua Cameroon Cardiology Department Yaoundé Central Hospital Yaoundé Cameroon Higher Institute of Health Sciences University of the Mountains Bagangté Cameroon Faculty of Medicine and Pharmaceutical Sciences University of Douala Douala Cameroon Department of Internal Medicine Douala General Hospital Douala Cameroon Faculty of Health Sciences University of Bamenda Bamenda Cameroon Cardiology Department Yaoundé General Hospital Yaoundé Cameroon

Background: Venous thromboembolism (VTE) is a major public health problem due to its increasing frequency, mortality and management cost. This cost may require major financial efforts from patients, especially in developing countries like ours where less than 7% of the population has health insurance. This study aimed to estimate the direct cost of managing VTE in three reference hospitals in Yaoundé. Methods: This was a cross-sectional retrospective study over a three-year period (from January 1st 2018 to December 31 2020) carried out in the Cardiology departments of the Central and General Hospitals, and the Emergency Centre of the city of Yaoundé. All patients managed during the study period for deep vein thrombosis and pulmonary embolism confirmed by venous ultrasound coupled with Doppler and computed tomography pulmonary angiography respectively were included. For each patient, we collected sociodemographic and clinical data as well as data on the cost of consultation, hospital stay, workups and medications. These data were analysed using SPSS version 23.0. Results: A total of 92 patient’s records were analysed. The median age was 60 years [48 - 68] with a sex ratio of 0.53. The median direct cost of management of venous thromboembolism was 766,375 CFAF [536,455 - 1,029,745] or $1415 USD. Management of pulmonary embolism associated with deep vein thrombosis was more costly than isolated pulmonary embolism or deep vein thrombosis. Factors influencing the direct cost of management of venous thromboembolism were: hospital structure (p = 0.015), health insurance (p 0.001), type of pulmonary embolism (p = 0.021), and length of hospital stay (p = 0.001). Conclusion: Management of VTE is a major financial burden for our patients and this burden is influenced by the hospital structure, health insurance, type of pulmonary embolism and length of hospital stay.

关键词： cost Management Venous Thromboembolism Yaoundé

Social cost Analysis of Biological Control Technology for Crop Diseases and Insect Pests

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Asian Agricultural Research 2024年第8期16卷 14-16页

作者： Jie XIE Lingling XIAO Jinyu ZHAO Shoumei WAN Jian TANG Xiaolei JI Jing PENG Guiyang Customs Logistics Management Center Guiyang 550081China Guizhou Light Industry Vocational and Technical College Guiyang 561000China

With the rapid development of modern agriculture,the prevention and control of crop diseases and insect pests has become an important part to ensure the safety of agricultural production,the quality of agricultural products and the safety of agricultural ecological *** the effect of traditional chemical prevention and control technology is remarkable,the health risks and environmental problems brought by it should not be *** a green and environmentally friendly means of prevention and control,biological prevention and control technology has gradually become a hot research topic and a trend of agricultural *** paper is intended to comprehensively evaluate the social costs of biological control technologies for crop diseases and pests,including the health risks reduced,environmental improvements,economic benefits,and barriers to promotion,and put forward corresponding policy recommendations.

关键词： Crops Diseases and insect pests Biological control Social cost

停车政策与可持续交通——写在The High cost of Free Parking译著出版之际

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上海城市规划 2024年第4期4卷 173-175页

作者：袁泉同济大学交通运输工程学院

在城市交通规划和政策领域,Donald Shoup教授首次出版于2005年的著作《免费停车的高昂代价》(The High cost of Free Parking)[1]是一部具有里程碑意义的作品。Shoup教授以其深刻的见解和严谨的分析,揭示了免费停车政策对城市发展、交... 详细信息

在城市交通规划和政策领域,Donald Shoup教授首次出版于2005年的著作《免费停车的高昂代价》(The High cost of Free Parking)[1]是一部具有里程碑意义的作品。Shoup教授以其深刻的见解和严谨的分析,揭示了免费停车政策对城市发展、交通拥堵、环境污染以及社会公平等方面的深远影响。

关键词：停车政策可持续交通交通拥堵城市交通规划首次出版环境污染 cost 高昂代价

Discussion on Construction Project cost Budget Settlement Review

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Journal of Architectural Research and Development 2024年第1期8卷 43-48页

作者： Hongfeng Liu Yumin Yuan Chongqing University of Science&Technology Chongqing 401331China

Construction project cost control involves many complex contents,forming a large amount of data *** the processing method is unreasonable,it will likely affect the cost control ***,in the current construction project management,the review of project cost budget settlement is the focus to solve the cost management problems of construction projects and promote the development of the construction *** article mainly analyzes the influencing factors and current situation of construction project cost budget settlement review,and based on this,it explores the project cost budget settlement review strategy to promote the healthy development of construction project cost work.

关键词： Construction project cost Budget settlement Review strategy

cost REDUCTION OF CEMENTING FILL IN KANGJIAWAN MINE

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中国有色金属学会会刊：英文版 1997年第1期7卷 6-8页

作者： Wang, Xinmin Zhang, Qinli Chen, Changmin Li, Yanping Central South Univ of Technology Changsha China

ＣＯＳＴＲＥＤＵＣＴＩＯＮＯＦＣＥＭＥＮＴＩＮＧＦＩＬＬＩＮＫＡＮＧＪＩＡＷＡＮＭＩＮＥＷａｎｇＸｉｎｍｉｎ，ＺｈａｎｇＱｉｎｌｉＤｅｐａｒｔｍｅｎｔｏｆＲｅｓｏｕｒｃｅｓＥｘｐｌｏｉｔａｔｉｏｎＥｎｇｉｎｅｒｉｎｇ... 详细信息

ＣＯＳＴＲＥＤＵＣＴＩＯＮＯＦＣＥＭＥＮＴＩＮＧＦＩＬＬＩＮＫＡＮＧＪＩＡＷＡＮＭＩＮＥＷａｎｇＸｉｎｍｉｎ，ＺｈａｎｇＱｉｎｌｉＤｅｐａｒｔｍｅｎｔｏｆＲｅｓｏｕｒｃｅｓＥｘｐｌｏｉｔａｔｉｏｎＥｎｇｉｎｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎｉｖ...

关键词： fill cost cement consumption continuous filling time cementing rockfill

Development cost prediction of general aviation aircraft projects with parametric modeling

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Chinese Journal of Aeronautics 2019年第6期32卷 1465-1471页

作者： Xiaonan CHEN Jun HUANG Mingxu YI School of Aeronautic Science and Technology Beihang University

The study of the development cost of general aviation aircraft is limited by small samples with many cost-driven factors. This paper investigates a parametric modeling method for prediction of the development cost of general aviation aircraft. The proposed technique depends on some principal components, acquired by utilizing P value analysis and gray correlation analysis. According to these principal components, the corresponding linear regression and BP neural network models are established respectively. The feasibility and accuracy of the P value analysis are verified by comparing results of model fitting and prediction. A sensitivity analysis related to model precision and suitability is discussed in detail. Results obtained in this study show that the proposed method not only has a certain degree of versatility, but also provides a preliminary prediction of the development cost of general aviation aircraft.

关键词： BP neural network Development cost General aviation aircraft Gray correlation analysis Linear regression P value analysis Parametric modeling Preliminary prediction Sensitivity analysis

Uniform Pricing Strategy vs. Price Differentiation Strategy in the Presence of cost Saving and Demand Increasing

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Journal of Systems Science & Complexity 2019年第3期32卷 932-946页

作者： CAI Qiang LUO Chunlin TIAN Xin WANG Shouyang School of Economics and Management University of Chinese Academy of Sciences Beijing 100190 China Key Laboratory of Big Data Mining and Knowledge Management Chinese Academy Sciences Beijing 100190 China School of Information Technology Jiangxi University of Finance and Economics Nanchang 330013 China Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100190 China

Price differentiation or discrimination strategy has been regarded as the best choice for firms with online and offline channels, however, recent years often witnessed the practices of the uniform pricing strategy. This paper aims to address the question whether the uniform pricing strategy may be better for the manufacturer, when the uniform pricing strategy has a positive impact on increasing the ciistomer demand and reducing the operations cost. The research shows that the uniform pricing strategy can be bet ter than the price differentiation strategy when the cost saving and demand increasing are large enough or the consumers' acceptance of online channel lies in a certain interval. Moreover, the manufac tu rers or brand owners need a tradeoff bet ween the benefit from online channel and the negative impact from the offline channel when they implement the price differentiation strategy. Finally, the authors obtain some managerial insights and implications based on the numerical analyses, which are in line with the phenomena in practice.

关键词： cost saving demand increasing dual-channel price differentiation strategy uniform pricing strategy

Ultrastable low-cost colloidal quantum dot microlasers of operative temperature up to 450 K

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Light(Science & Applications) 2021年第4期10卷 610-619页

作者： Hao Chang Yichi Zhong Hongxing Dong Zhenyu Wang Wei Xie Anlian Pan Long Zhang Key Laboratory of Materials for High-Power Laser Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences201800 ShanghaiChina State Key Laboratory of Precision Spectroscopy School of Physics and Electronic ScienceEast China Normal University200241 ShanghaiChina Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences310024 HangzhouChina State Key Laboratory of High Field Laser Physics CAS Center for Excellence in Ultra-intense Laser ScienceShanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences201800 ShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences100049 BeijingChina Key Laboratory for Micro-Nano Physics and Technology of Hunan Province State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Materials Science and EngineeringHunan University410082 ChangshaChina

Quantum dot microlasers,as multifunaional optical source components,are of great importance for full-color highpixel display,miniaturized coherent lighting,and on-chip integrated photonic and electronic *** the first synthesis of colloidal quantum dots(CQD)in the 1990s,motivation to realize high-performance low-cost CQD micro-/nanolasers has been a driving force for more than three ***,the low packing density,inefficient coupling of CQDs with optical cavities,and the poor thermal stability of miniaturized complex systems make it challenging to achieve practical CQD microVnanolasers,especially to combine the continuous working ability at high temperatures and the low-cost potential with mass-produced synthesis ***,we developed closepacked CQD-assembled microspheres and embedded them in a silica matrix through the rapid self-aggregation and solidification of CdSe/ZnS *** technology addresses the core issues of photoluminescence(PL)quenching effect and low optical gain in traditional CQD laser ***-efficiency low-threshold CQD microlasers are demonstrated together with long-playing(40 min)working stability even at 450 K under pulsed laser excitation,which is the highest operational temperature for CQD ***,single-mode CQD microlasers are obtained with tunable wavelengths across the entire visible spectral *** chemosynthesis process supports the mass-produced potential of high-density integrated CQD microlasers,promoting CQD-based low-cost high-temperature microdevices.

关键词： cost quantum lighting