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Mathematical Reasoning of Treatment Principle Based on the Stable Logic Analysis Model of Complex Systems 被引量:2
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作者 Yingshan Zhang 《Intelligent Control and Automation》 2012年第1期1-15,共15页
The article reviews the stable logic analysis model of complex systems or steady multilateral systems with two non-compatibility relations. Energy concept in Physics is introduced to the multilateral systems and used ... The article reviews the stable logic analysis model of complex systems or steady multilateral systems with two non-compatibility relations. Energy concept in Physics is introduced to the multilateral systems and used to deal with the multilateral system diseases. By using mathematical reasoning, it is demonstrated that the treatment principle: “Virtual disease is to fill his mother but real disease is to rush down his son” and “Strong inhibition of the same time, support the weak” which due to the “Yin Yang Wu Xing” Theory in Traditional Chinese Medicine (TCM). 展开更多
关键词 STEADY Multilateral systems Opposite RELATIONS CAPABILITY of INTERVENTION Reaction CAPABILITY of SELF-PROTECTION Side Effects Medical and Drug Resistance Problem
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A Test Method for the Static/Moving State of Targets Applied to Airport Surface Surveillance MLAT System
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作者 Huang Rongshun Peng We +2 位作者 Li Jing Wu Honggang Li Xingbo 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2016年第4期425-432,共8页
Due to the particularity of its location algorithm,there are some unique difficulties and features regarding the test of target motion states of multilateration(MLAT)system for airport surface surveillance.This paper ... Due to the particularity of its location algorithm,there are some unique difficulties and features regarding the test of target motion states of multilateration(MLAT)system for airport surface surveillance.This paper proposed a test method applicable for the airport surface surveillance MLAT system,which can effectively determine whether the target is static or moving at a certain speed.Via a normalized test statistic designed in the sliding data window,the proposed method not only eliminates the impact of geometry Dilution of precision(GDOP)effectively,but also transforms the test of different motion states into the test of different probability density functions.Meanwhile,by adjusting the size of the sliding window,it can fulfill different test performance requirements.The method was developed through strict theoretical extrapolation and performance analysis,and simulations results verified its correctness and effectiveness. 展开更多
关键词 multilateration(MLAT) hypothesis testing motion state detection sliding window geometric Dilution of precision(GDOP)
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Research on the implementation of the Convention on Biological Diversity among the Shanghai Cooperation Organisation countries
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作者 HAO Yun WU Miao +2 位作者 ZHANG Xiaoyun WANG Lixian HE Jingjing 《Regional Sustainability》 2023年第3期322-331,共10页
The Shanghai Cooperation Organisation(SCO)is the most extensive and populous comprehensive regional cooperation organization in the world,covering about half of the world's population,with not only a huge consumer... The Shanghai Cooperation Organisation(SCO)is the most extensive and populous comprehensive regional cooperation organization in the world,covering about half of the world's population,with not only a huge consumer market,but also rich natural resources and strong productivity.As one of the important platforms for the implementation of the Green Belt and Road Initiative,it is an important opportunity for the SCO to actively participate in global governance and contribute to building a community of global life.To investigate the status of biodiversity conservation in the SCO countries,we used literature analysis approach.We surveyed the performance and international cooperation status of the SCO countries in the implementation of the Convention on Biological Diversity(CBD),listed facing problems and threats to biodiversity conservation,including not optimistic biodiversity conservation project implementation status,contradiction between ecological protection and economic development,impacts of human activities,lack of funds and talents,etc.,and analyzed the biodiversity protection needs of the SCO countries from the perspectives of project and policy implementation status and international cooperation.According to the cooperation between China and the other SCO countries on biodiversity conservation and the post-2020 global biodiversity framework goals,we gave some recommendations:(1)promoting access to genetic resources and benefit-sharing;(2)integrating multiple funds and innovating the implementation of funding mechanism;(3)developing talent training and exchange programs and deepening multilateral cooperation;(4)strengthening cross-border cooperation and improving cooperation network;and(5)establishing a coordination mechanism for biodiversity conservation within the framework of the SCO. 展开更多
关键词 Shanghai Cooperation Organisation(SCO) Biodiversity conservation Convention on Biological Diversity(CBD) International cooperation Cross-border cooperation Multilateral cooperation
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China’s Regional and Global Policy Through the Shanghai Cooperation Organization
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作者 Enayatollah Yazdani MA Yanzhe 《International Relations and Diplomacy》 2023年第4期171-189,共19页
China,as a new global power,is expanding its influence across the globe and regions through various strategies and means,including regional and global organizations,in the post-Cold War era.As a result,since the Shang... China,as a new global power,is expanding its influence across the globe and regions through various strategies and means,including regional and global organizations,in the post-Cold War era.As a result,since the Shanghai Cooperation Organization(SCO)was established in 2001,China,as one of its major founders,had attempted to use the SCO as a platform for influence beyond its borders.This paper aims to investigate China’s growing influence and diplomatic prowess through the SCO. 展开更多
关键词 China Shanghai Cooperation Organization foreign policy MULTILATERALISM
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分支井工具的研制及室内模拟试验 被引量:1
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作者 菅志军 《现代制造技术与装备》 2010年第6期25-26,共2页
多分支井技术被认为是21世纪石油工业领域的重大技术之一,是油田降耗、增产的有效途径。该项技术可广泛应用于我国老油田、边际油田、剩余油、稠油的开发,对于降低开采成本,提高油田的采收率具有重要的意义。本文介绍了所研制的一种用于... 多分支井技术被认为是21世纪石油工业领域的重大技术之一,是油田降耗、增产的有效途径。该项技术可广泛应用于我国老油田、边际油田、剩余油、稠油的开发,对于降低开采成本,提高油田的采收率具有重要的意义。本文介绍了所研制的一种用于9-5/8"套管内开窗侧钻4级分支井系统的工具的基本功能原理及工具模拟试验的情况。 展开更多
关键词 multilateral WELL tool STRUCTURE and principle TEST
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几种机场场面监视技术的比较 被引量:7
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作者 郭昊 《中国高新技术企业》 2007年第15期100-100,106,共2页
场面监视雷达、ADS-B(Automatic Dependence Surveillance-Broadcasting广播式自动相关监视)和Multilateration(多点定位)是目前机场场面定位的几种技术手段,本文分析了国内外场面监视系统的现状,综述了三者技术的基本原理并进行了比较... 场面监视雷达、ADS-B(Automatic Dependence Surveillance-Broadcasting广播式自动相关监视)和Multilateration(多点定位)是目前机场场面定位的几种技术手段,本文分析了国内外场面监视系统的现状,综述了三者技术的基本原理并进行了比较,对我国场面监视系统进行了总结和展望。 展开更多
关键词 场面监视雷达 ADS-B multilateration SSR
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Image Mathematics—Mathematical Intervening Principle Based on “Yin Yang Wu Xing” Theory in Traditional Chinese Mathematics (I) 被引量:28
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作者 Yingshan Zhang Weilan Shao 《Applied Mathematics》 2012年第6期617-636,共20页
By using mathematical reasoning, this paper demonstrates the mathematical intervening principle: “Virtual disease is to fill his mother but real disease is to rush down his son” (虚则补其母, 实则泄其子) and “Strong... By using mathematical reasoning, this paper demonstrates the mathematical intervening principle: “Virtual disease is to fill his mother but real disease is to rush down his son” (虚则补其母, 实则泄其子) and “Strong inhibition of the same time, support the weak” (抑强扶弱) based on “Yin Yang Wu Xing” Theory in image mathematics of Traditional Chinese Mathematics (TCMath). We defined generalized relations and generalized reasoning, introduced the concept of steady multilateral systems with two non-compatibility relations, and discussed its energy properties. Later based on the intervention principle in image mathematics of TCMath and treated the research object of the image mathematics as a steady multilateral system, it has been proved that the mathematical intervening principle is true. The kernel of this paper is the existence and reasoning of the non-compatibility relations in steady multilateral systems, and it accords with the oriental thinking model. 展开更多
关键词 Image MATHEMATICS “Yin Yang WU Xing” Theory Steady Multilateral systems Opposite Non-Compatibility Relations INTERVENTION RULE Self-Protection RULE MATHEMATICAL Side Effects Mathe-matical INTERVENTION Resistance Problem
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Drilling and completion technologies of coalbed methane exploitation: an overview 被引量:4
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作者 Tianshou Ma Jinhua Liu +1 位作者 Jianhong Fu Bisheng Wu 《International Journal of Coal Science & Technology》 EI CAS CSCD 2022年第5期1-31,共31页
Coalbed methane(CBM)drilling and completion technologies(DCTs)are signifcant basis for achieving efcient CBM exploration and exploitation.Characteristics of CBM reservoirs vary in diferent regions around the world,the... Coalbed methane(CBM)drilling and completion technologies(DCTs)are signifcant basis for achieving efcient CBM exploration and exploitation.Characteristics of CBM reservoirs vary in diferent regions around the world,thereby,it is crucial to develop,select and apply the optimum DCTs for each diferent CBM reservoir.This paper frstly reviews the development history of CBM DCTs throughout worldwide and clarifes its overall development tendency.Secondly,diferent well types and its characteristics of CBM exploitation are summarized,and main application scopes of these well types are also discussed.Then,the key technologies of CBM drilling(directional drilling tools,measurement while drilling,geo-steering drilling,magnetic guidance drilling,underbalanced drilling and drilling fuids),and the key technologies of CBM completion(open-hole,cavity and under-ream completion,cased-hole completion,screen pipe completion and horizontal well completion)are summarized and analyzed,it is found that safe,economic and efcient development of CBM is inseparable from the support of advanced technologies.Finally,based on the current status of CBM development,the achievements,existing challenges and future prospects are summarized and discussed from the perspective of CBM DCTs. 展开更多
关键词 Coalbed methane CBM EXPLOITATION DRILLING COMPLETION Horizontal well L/U/V-shaped well Multilateral well
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Estimation of Three-Dimensional Volumetric Errors of Numerically Controlled Machine Tools by a Tracking Interferometer 被引量:4
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作者 Soichi Ibaraki Kunitaka Takeuchi +3 位作者 Tomoaki Yano Toshiyuki Takatsuji Sonko Osawa Osamu Sato 《Journal of Mechanics Engineering and Automation》 2011年第4期313-319,共7页
This paper presents the estimation of three-dimensional volumetric errors of a machining center by using a tracking interferometer. A tracking interferometer is a laser interferometer with the mechanism to steer the l... This paper presents the estimation of three-dimensional volumetric errors of a machining center by using a tracking interferometer. A tracking interferometer is a laser interferometer with the mechanism to steer the laser direction to follow a target retroreflector. Based on the triangulation principle, the three-dimensional position of the target can be estimated from measured laser displacements. Its capability to measure three-dimensional positioning errors for arbitrary trajectories is important for the indirect measurement of the machine's kinematic model. This paper presents experimental investigation of the estimation accuracy of the multilateration-based measurement by a tracking interferometer. A tracking interferometer developed by a part of the authors is used in experiments. In the present experiment, the measured volume of target positions was 100 mm × 100 mm × 100 mm. The estimation accuracy of targets within this volume was not sufficiently high compared to the positioning error of the measured machine tool. The results of the experiment and simulation show that the estimation uncertainty is dependent on tracking interferometer locations relative to target locations. Error sensitivity analysis shows that wider distribution of tracker positions in XY improves the estimation accuracy. 展开更多
关键词 Tracking interferometer laser tracker volumetric errors multilateration machine tools estimation accuracy.
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Productivity prediction model and optimal configuration of herringbone multilateral well 被引量:1
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作者 蔡明 尹洪军 +1 位作者 钟会影 付春权 《Journal of Central South University》 SCIE EI CAS 2013年第3期770-775,共6页
In order to accurately predict the productivity of herringbone multilateral well,a new productivity prediction model was founded.And based on this model,orthogonal test and multiple factor variance analysis were appli... In order to accurately predict the productivity of herringbone multilateral well,a new productivity prediction model was founded.And based on this model,orthogonal test and multiple factor variance analysis were applied to study optimization design of herringbone multilateral well.According to the characteristics of herringbone multilateral well,by using pressure superposition and mirror image reflection theory,the coupled model of herringbone multilateral well was developed on the basis of a three-dimensional pseudo-pressure distribution model for horizontal wells.The model was formulated in consideration of friction loss,acceleration loss of the wellbore and mixed loss at the confluence of main wellbore and branched one.After mathematical simulation on productivity of the herringbone multilateral well with the coupled model,the effects of well configuration on productivity were analyzed.The results show that lateral number is the most important factor,length of main wellbore and length of branched wellbore are the secondary ones,angle between main and branched one has the least influence. 展开更多
关键词 herringbone multilateral well wellbore pressure drop productivity prediction optimization design
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Mathematical Reasoning of Treatment Principle Based on “Yin Yang Wu Xing” Theory in Traditional Chinese Medicine 被引量:5
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作者 Yingshan Zhang 《Chinese Medicine》 2011年第1期6-15,共10页
By using mathematical reasoning, this paper demonstrates the treatment principle: “Virtual disease is to fill his mother but real disease is to rush down his son” and “Strong inhibition of the same time, support th... By using mathematical reasoning, this paper demonstrates the treatment principle: “Virtual disease is to fill his mother but real disease is to rush down his son” and “Strong inhibition of the same time, support the weak” based on “Yin Yang Wu Xing” Theory in Traditional Chinese Medicine (TCM). We defined two kinds of opposite relations and one kind of equivalence relation, introduced the concept of steady multilateral systems with two non-compatibility relations, and discussed its energy properties. Later based on the treatment of TCM and treated the healthy body as a steady multilateral system, it has been proved that the treatment principle is true. The kernel of this paper is the existence and reasoning of the non-compatibility relations in steady multilateral systems, and it accords with the oriental thinking model. 展开更多
关键词 Traditional Chinese Medicine “Yin Yang WU Xing” THEORY STEADY Multilateral systems Opposite RELATIONS Side Effects Medical and Drug Resistance Problem
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Mathematical Reasoning of Treatment Principle Based on “Yin Yang Wu Xing” Theory in Traditional Chinese Medicine (II) 被引量:4
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作者 Yingshan Zhang 《Chinese Medicine》 2011年第4期158-170,共13页
By using mathematical reasoning, this paper demonstrates the treatment principle: “Do not treat a disease after it has occurred. But treat the disease before it will occur” (不治已病治未病) based on “Yin Yang Wu X... By using mathematical reasoning, this paper demonstrates the treatment principle: “Do not treat a disease after it has occurred. But treat the disease before it will occur” (不治已病治未病) based on “Yin Yang Wu Xing” Theory in Traditional Chinese Medicine (TCM). We defined generalized relations and reasoning, introduced the concept of generalized steady multilateral systems, and discussed its energy properties. Later based on the treatment of TCM and treated the healthy body as a steady multilateral system, it has been proved that the treatment principle above is true. The kernel of this paper is the existence and reasoning of the non-compatibility relations in steady multilateral systems, and it accords with the oriental thinking model. 展开更多
关键词 Traditional Chinese Medicine (TCM) “Yin Yang WU Xing” THEORY STEADY Multilateral systems Opposite Relations SIDE-EFFECTS Medical and Drug Resistance Problem
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Combined stochastic and discrete simulation to optimise the economics of mixed single-horizontal and multilateral well offshore oil developments 被引量:1
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作者 ALMEDALLAH Mohammed ALTAHEINI Suleiman Khalid +1 位作者 CLARK Stuart WALSH Stuart 《Petroleum Exploration and Development》 CSCD 2021年第5期1183-1197,共15页
Multilateral wells promise cost savings to oil and fields as they have the potential to reduce overall drilling distances and minimize the number of slots required for the surface facility managing the well.However,dr... Multilateral wells promise cost savings to oil and fields as they have the potential to reduce overall drilling distances and minimize the number of slots required for the surface facility managing the well.However,drilling a multilateral well does not always increase the flow rate when compared to two single-horizontal wells due to competition in production inside the mother-bore.Here,a holistic approach is proposed to find the optimum balance between single and multilateral wells in an offshore oil development.In so doing,the integrated approach finds the highest Net Present Value(NPV)configuration of the field considering drilling,subsurface,production and financial analysis.The model employs stochastic perturbation and Markov Chain Monte-Carlo methods to solve the global maximising-NPV problem.In addition,a combination of Mixed-Integer Linear Programming(MILP),an improved Dijkstra algorithm and a Levenberg-Marquardt optimiser is proposed to solve the rate allocation problem.With the outcome from this analysis,the model suggests the optimum development including number of multilateral and single horizontal wells that would result in the highest NPV.The results demonstrate the potential for modelling to find the optimal use of petroleum facilities and to assist with planning and decision making. 展开更多
关键词 multilateral well horizontal well well pattern optimisation drilling cost Net Present Value offshore oil development
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MLAT系统在广州机场场面监视雷达系统中的应用 被引量:3
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作者 丘美玲 《科技传播》 2013年第20期190-191,共2页
本文较详细说明广州白云国际机场场面监视雷达的组成及功能,指出了场面监视雷达对管制的局限性,说明了MLAT系统的重要性,同时指出了MLAT系统在广州白云国际机场场面监视雷达系统中应用实施的有利条件及存在的问题。
关键词 场面监视雷达 MLAT(multilateration) 广州白云国际机场 传感器 TDOA(到达时
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Acupuncture Treating Dystrophy Based on pH <br/>—Mathematical Reasoning of Treatment Principle Based on Yin Yang Wu Xing Theory in Traditional Chinese Medicine (III) 被引量:2
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作者 Yingshan Zhang Bibo Zhang 《Chinese Medicine》 2019年第2期39-105,共67页
Theory of both Zangxiang (藏象) and Jingluo (经络) is useful in understanding disease. By using mathematical reasoning based on Yin Yang Wu Xing Theory in Traditional Chinese Medicine (TCM), this paper demonstrates th... Theory of both Zangxiang (藏象) and Jingluo (经络) is useful in understanding disease. By using mathematical reasoning based on Yin Yang Wu Xing Theory in Traditional Chinese Medicine (TCM), this paper demonstrates the treatment principle: “Searching for a root cause of disease in cure, treatment of both the root-cause and symptoms at the same time” (治病求本, 标本兼治). It means that for a human body, there is the mathematical structure of both Zangxiang and Jingluo as her/his second physiological system. It can be used to determine both the root-cause and symptoms of the sick organ by using both Zangxiang and Jingluo. In general, for the human blood pH value, the normal range of theory is [7.34539, 7.45461] nearly to [7.35, 7.45], and the center is 7.4. The first or second transfer law of a human body’s energies changes according to the different blood pH values whether in the normal range or not. Human disease treatment should protect and maintain the balance of two incompatibility relations: the loving relationship and the killing relationship. As an application, acupuncture is used to treat limb-girdle muscular dystrophy. 展开更多
关键词 Traditional Chinese Medicine (TCM) YIN Yang WU Xing THEORY Steady Multilateral systems INCOMPATIBILITY Relations Side Effects Medical and Drug Resistance Problem
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3D finite element modelling of multilateral junction wellbore stability
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作者 Assef Mohamad-Hussein Juliane Heiland 《Petroleum Science》 SCIE CAS CSCD 2018年第4期801-814,共14页
Wellbore failure can occur at different stages of operations. For example, wellbore collapse might happen during drilling and/or during production. The drilling process results in the removal of an already stressed ro... Wellbore failure can occur at different stages of operations. For example, wellbore collapse might happen during drilling and/or during production. The drilling process results in the removal of an already stressed rock material. If the induced stresses near the wellbore exceed the strength of rock, wellbore failure occurs. The production process also changes the effective stresses around the wellbore. Such changes in stresses can be significant for high drawdown pressures and can trigger wellbore failure. In this paper, the Mohr–Coulomb failure criterion with a hyperbolic hardening is used. The model parameters are identified from triaxial compression tests. The numerical simulations of laboratory tests showed that the model can reproduce the mechanical behaviour of sandstone. In addition, the simulations of multilateral junction stability experiments showed that the model was able to reproduce yielding and failure at the multilateral junction for different levels of applied stresses. Finally, a numerical example examining multilateral junction stability in an open borehole during drilling and production is presented. The results illustrate the development of a localized failure zone proximate to the area where two wellbore tracks join, particularly on the side with a sharp approaching angle, which would significantly increase the risk of wellbore collapse at the junction. 展开更多
关键词 Multilateral junction Numerical modelling STABILITY
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Acupuncture Treating Heart Disease Based on Eight Palaces or Eight Veins <br/>—Mathematical Reasoning of Treatment Principle Based on Yin Yang Wu Xing Theory in Traditional Chinese Medicine (IV) 被引量:1
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作者 Yingshan Zhang Yan Li Chunyun Guo 《Chinese Medicine》 2021年第3期47-117,共71页
Theory<span><span><span style="font-family:;" "=""> of eight palaces (</span></span></span><span><span><span style="font-family:宋体;&qu... Theory<span><span><span style="font-family:;" "=""> of eight palaces (</span></span></span><span><span><span style="font-family:宋体;">八宫</span></span></span><span><span><span style="font-family:;" "="">) or eight veins (</span></span></span><span><span><span style="font-family:宋体;">八脉</span></span></span><span><span><span style="font-family:;" "="">) is useful in understanding the basic sick subsystems that may be to fall ills as the <span>root-cause</span>. By using mathematical reasoning based on Yin Yang Wu Xing Theory in Traditional Chinese Medicine (TCM), this paper demonstrates the treatment principle: “Even if all changed, it is hard to change one’s nature” (</span></span></span><span><span><span style="font-family:宋体;">江山易改</span></span></span><span><span><span style="font-family:;" "="">, </span></span></span><span><span><span style="font-family:宋体;">本性难移</span></span></span><span><span><span style="font-family:;" "="">). The eight palaces or eight veins can be used to diagnose basic sick subsystems that may be to fall ills as the <span>root-cause</span>. The first or second transfer law of human body energies of the eight palaces or eight veins according to the different blood pH values of a human body whether in the normal range or not,</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">respectively,</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">assuming</span></span></span><span><span><span style="font-family:;" "=""> </span></span></span><span><span><span style="font-family:;" "="">that the range of blood pH value is divided into four parts from small to large. Both second and third are for a healthy human body. Both the <span>root-cause</span> and symptoms come from the first transfer law of human body energies. And both first and fourth are for an unhealthy human body. Both the <span>root-cause</span> and symptoms come from the second transfer law of human body energies. A disease treatment should protect and maintain the balance of two incompatibility relations: the loving relationship and the killing relationship. As an application, acupuncture is used to treat atrial premature beats as <span>a congenital</span> heart disease.</span></span></span> 展开更多
关键词 Traditional Chinese Medicine (TCM) Yin Yang Wu Xing Theory Steady Multilateral systems Incompatibility Relations Side Effects Medical and Drug Resistance Problem
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Automated Negotiation in E Commerce: Protocol Relevance and Improvement Techniques
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作者 S.R.Vij D.Mukhopadhyay A.J.Agrawal 《Computers, Materials & Continua》 SCIE EI 2019年第9期1009-1024,共16页
We all negotiate,formally or informally,in jobs,in day today lives and outcomes of negotiations affect those processes of life.Although negotiation is an intrinsic nature of human psyche,it is very complex phenomenon ... We all negotiate,formally or informally,in jobs,in day today lives and outcomes of negotiations affect those processes of life.Although negotiation is an intrinsic nature of human psyche,it is very complex phenomenon to implement using computing and internet for the various purposes in E Commerce.Automation of negotiation process poses unique challenges for computer scientists and researchers,so here we study how negotiation can be modeled and analyzed mathematically,what can be different techniques and strategies or set of rules/protocols to be implemented and how they can be relevantly implemented.We are in a quest to find out how this complex process,which involves human psyche can be automated using computers and modern day technologies.Now,the quest is not only automation,looking at the research in the related field in last ten years;but it is all about finding solutions to make e-negotiation more efficient and more accurate,as well as useful in any kind of electronic trading situations.Here is an attempt to consolidate our work of last few years on automation of negotiation process;we call it as negotiation protocol on research,study as well as implementation level of negotiation automation.Overall,we are trying to give few solutions to make the automation more efficient. 展开更多
关键词 Negotiation automation decision support systems BILATERAL multilateral alternating offers protocol multi strategy
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An Analysis of the EU's Conflicted Attitude toward Globalization
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作者 Liu Mingli 《Contemporary International Relations》 2018年第6期81-101,共21页
As a whole, the European Union has yet to come to a clear consensus on globalization, manifesting a kind of self-contradicting mentality and conflicted policy orientations, evidenced by its desire to reap the benefits... As a whole, the European Union has yet to come to a clear consensus on globalization, manifesting a kind of self-contradicting mentality and conflicted policy orientations, evidenced by its desire to reap the benefits brought about by globalization while at the same time trying to evade challenges. For example, the EU actively resists US protectionism, while clinging to protectionist measures in its own policies;and it supports the mechanisms for international multilateral cooperation,but at the time it willfully acts to change the rules. The emergence of the EU's conflicted attitudetoward globalization may be attributed to the fact that it has too many member states with a wide disparity in their economic performances in globalization, which has made it difficult for them to reach a consensus. It can also be related to the complexity of the EU's internal trade policy and decision-making mechanisms. This mentality will affect its role in the global economy, as it is likely that the EU will play the roles of reformer of the mechanism for multilateral cooperation, middleman in international trade disputes, and straggler in economic reforms. 展开更多
关键词 the EU GLOBALIZATION PROTECTIONISM multilateral COOPERATION
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The Impact of Multilateral Imported Cases of COVID-19 on the Epidemic Control in China
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作者 Jiwei Jia Siyu Liu +3 位作者 Jian Ding Guidong Liao Lihua Zhang Ran Zhang 《Communications in Mathematical Research》 CSCD 2020年第3期320-335,共16页
While the spread of COVID-19 in China is under control,the pandemic is developing rapidly around the world.Due to the normal migration of population,China is facing the high risk from imported cases.The potential spec... While the spread of COVID-19 in China is under control,the pandemic is developing rapidly around the world.Due to the normal migration of population,China is facing the high risk from imported cases.The potential specific medicine and vaccine are still in the process of clinical trials.Currently,controlling the impact of imported cases is the key to prevent new outbreak of COVID-19 in China.In this paper,we propose two impulsive systems to describe the impact of multilateral imported cases of COVID-19.Based on the published data,we simulate and analyze the epidemic trends under different control strategies.In particular,we compare four different scenarios and show the corresponding medical burden.The results can be useful in designing appropriate control strategy for imported cases in practice. 展开更多
关键词 COVID-19 multilateral imported cases impulsive system numerical simulation
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