High Capacity Spectrum Sensing Framework Based on Relay Cooperation

In order to reduce interference to primary users and provide better performance of detection probability and channel capacity in multi-user cooperative spectrum sensing networks, a high capacity spectrum sensing framework is proposed based on the analysis of amplification factors on the performance of detection probability and channel capacity. Thanks to the energy concentration property of chirp signals in the Fractional Fourier Transform(Fr FT) domain, sinusoidal signal and different chirp signals are utilized for primary user and cognitive users, respectively. Hence, spectrum sensing and signal transmission can be performed simultaneously in our proposed framework. Simulation results show that compared with the previous relay-based framework, the modified cooperative spectrum sensing framework can improve the detection probability significantly, and the channel capacity can also be improved. Moreover, the amplification factor can be used to realize the tradeoff between detection probability and channel capacity in our proposed framework.

China Aiming at Capacity Cooperation Worldwide

At present,global industrial structure adjustment accelerates,infrastructure construction is still booming,and developing countries are vigorously promoting the industrialization and urbanization,all providing great opportunities for international cooperation on capacity and equipment manufacturing.In May 2015,the'Guiding Opinions of the State Council of the Peoples Republic of China on Promoting

Capacity Building-Oriented Cooperation between China and BRI Countries

This paper identifies the international industrial capacity cooperation led by the Chinese government and participated by Chinese companies under the Belt and Road Initiative(BRI)as“inclusive industrial capacity cooperation with a capacity-building orientation.”BRI cooperation demonstrates brand-new characteristics compared with previous international direct investments in terms of participants,investment areas and results.BRI cooperation aims to enhance local development capacity,promote economic development,increase exports,and improve industrial ecosystems.In the long run,international industrial capacity cooperation under the BRI helps achieve sustainable development in China and BRI countries for multi-win results.Yet risks and challenges also warrant attention and require countermeasures.

Research on the improved cooperative cellular system capacity

Recently, the multi-hop cellular networks have been widely studied in order to enhance the cell performances such as the cell capacity. While most of these works merely use the multi-hop methods instead of direct transmission without considering the co-channel inter-cell interference, signal transmission mode and the effects of the number of antennas. With the consideration of above important elements, this paper proposed an improved cellular system with multi-relay amplifies-andforward （AF） cooperative transmission scheme and the corresponding capacity expression is derived under the corresponding environment. By using the potential space diversity and selecting relays based on maximizing the capacity, the cellular system capacity can be improved effectively. The simulation results show that with the assistance of optimal selected relays, the improved cooperative cellular system capacity with multi-relay AF transmission scheme performs better than single-hop cellular system.

Performance analysis on channel capacity in cooperative MIMO system

Recent years, cooperative technology has taken a lot of attention since it can improve the bit error rate （BER） and lower the transmit power in radio mobile networks, especially when the direct channel between the source and the destination is poor. Cooperative multiple input multiple output （Co-lVlIMO） is a kind of MI- MO technique, where the multiple inputs and outputs are formed via cooperation. The capacity of Co-MIMO system over wireless channel has been investigated a lot, however few papers pay attention to the locations of the channel that may affect the probability distributions of the variable and the effect of antenna spatial correlation. The results can be achieved by choosing sub-channels that is not related to other sub-channels. This paper focu- ses on this problem. The simulation results show that once we search the partner we should consider trade offs cooperation get optimum system performance. It further investigates that cooperation between different terminals can reduce antenna spatial correlation, thereby increase the capacity and throughput of the system, and even reach the ideal capacity of MIMO system.

Infuencing Factors of Load Carrying Capacity and Cooperative Work Laws of Metro Uplift Piles

The buoyancy of groundwater can reduce the foundation bearing capa-city and cause the metro tunnels to float as a whole,which threatens the safety of structures seriously.Therefore,uplift piles are set up to improve the structural sta-bility.In this paper,FLAC3D software is used to establish the calculation models of pile foundation.The bearing failure process of uplift piles was simulated to study the influencing factors on single pile load bearing capacity as well as the cooperative work laws of pile groups.The load-displacement curves of pile top under different length-diameter ratios,pile soil interface characteristics and pile types are obtained,respectively.The results showed that,increasing the length-diameter ratio and the pile-soil interface roughness properdly can improve the bear-ing capacity of uplift piles.Besides,changing the shapes of constant pile section can also improve it,which has the most significant effect concerning of saving material cost.In the loading process of pile groups,the ultimate bearing capacity of corner pile is the biggest,the side pile is the next,and the center pile is the smallest.The de formation characteristics of pile top are as follows:the center pile is the biggest,the side pile is the next,and comer pile is the smallest.Combined with the results,the uplift resistance of group piles can be enhanced pertinently,and the conclusions provide guidance for the design and construction of up lift piles in the actual engineer.

A stream layered cooperative relay multicast scheme and capacity analysis in cellular systems

It is widely believed that cooperative relay technologies can improve the throughput of multicasting in mobile cellular networks significantly, however, the mobility of the relay terrninals may cause frequent relay link outage. This paper proposes a stream layered cooperative relay scheme to deal with this problem. In order to study the characteristics of layered relay channels in the scheme, the capacity region is determined based on a single and a multi relay abstract model with streams layering. Besides, to satisfy the cellular network scenario, the results are extended to a wireless Gaussian channel model. The analysis and simulation results show that the scheme guarantees the continuity of the multicast streams, and maintains the high bandwidth of relay channel, with a slight loss on system capacity.

The Capacity to Cooperate

China-Africa relations take a big step up the ladder of cooperation as 2015 winds down with the Second Summit of the Forum on China-Africa Cooperation （FOCAC） in Johannesburg, South Africa on December 4-5, preceded by the Sixth FOCAC Ministeria Conference on December 3. The Johannesburg Summit, themed Africa-China Progressing Together： Win-Win Cooperation for Common Development, is historic, being the first time a FOCAC summit is held on African soil. ChinAfrica invited some Chinese experts and scholars to share their views on the summit and the future development of Sino-African relations.

NEW APPROACHES FOR COMPUTING DYNAMIC LOAD-CARRYING CAPACITY OF MULTIPLE COOPERATING ROBOTIC MANIPULATORS

A novel unified method for computing the dynamic load carrying capacity(DLCC) of multiple cooperating robotic manipulators is developed.In this method,the kinematic constraints and the governing dynamic equations of the multiple robot system are formulated in the joint space by using the method of transference of dependence from one set of generalized coordinates to another,and the virtual work principle,which includes the readily available dynamics and joint torques of individual manipulators,and the dynamic of payload.Based on this dynamic model,the upper limit of the DLCC at any points on a given trajectory is obtained by solving a small size linear programming problem.This method is conceptually straightforward,and it is applicable also to the cases of multi fingered robot hands and multi legged walking machines.

International Cooperation in Adaptation to Climate Change: Foreign Agendas or Local Necessities?

The paper aims to analyze climate change adaptation projects funded from international cooperation in Veracruz, which is a Mexican state. They used 5 criteria based on international, national and local dimensions as well as their relation to climate adaptation. From this evaluation, they were able to determine that the results were particularly negative. Mostly, because the objectives set by donor countries are scarcely related to the objectives and priorities of recipient countries, in this case developing countries, which are the most vulnerable to climate change. This provides insight into international collaborative projects in developing states and their impact on the socioeconomic, environmental and vulnerable ecosystems.

How China’s Aid Helps Recipient Countries Build Export Capacity

Based on data of China’s aid to 120 countries and recipient countries’export data between 2002-2014,this paper investigated the export effects of China’s aid.We found that China’s aid was conducive to recipient countries’exports to China,helping recipient countries boost their development capacity and meet China’s consumption demand at the same time.In this manner,China’s foreign aid has lived up to the principle of“mutually beneficial cooperation”.Heterogeneity test found that China’s aid helped recipient countries increase their exports of manufacturing goods of their comparative advantage,mainly medium-and low-end manufacturing products,to China without increasing the exports of non-manufacturing goods,such as agricultural produce as well as primary and resource goods.Our findings have thoroughly refuted criticisms like the“resource exploitation”narrative by Western countries against China.Apart from increasing African countries’exports to China,China’s aid also helped other recipient countries outside Africa,mostly medium-and low-income recipient countries,to export more to China.China’s aid-fortrade(AfT)programs did not significantly increase recipient countries’capacity to export to China.A test of the mechanism of action found that industrial development in recipient countries exerted only a partial intermediate effect in enhancing recipient countries’capacity to export to China.

The Influence of LOS Components on the Statistical Properties of the Capacity of Amplify-and-Forward Channels

Amplify-and-forward channels in cooperative networks provide a promising improvement in the network coverage and system throughput. Under line-of-sight (LOS) propagation conditions in such cooperative networks, the overall fading channel can be modeled by a double Rice process. In this article, we have stud-ied the statistical properties of the capacity of double Rice fading channels. We have derived the analytical expressions for the probability density function (PDF), cumulative distribution function (CDF), level- crossing rate (LCR), and average duration of fades (ADF) of the channel capacity. The obtained results are studied for different values of the amplitudes of the LOS components in the two links of double Rice fading channels. It has been observed that the statistics of the capacity of double Rice fading channels are quite dif-ferent from those of double Rayleigh and classical Rice fading channels. Moreover, the presence of an LOS component in any of the two links increases the mean channel capacity and the LCR of the channel capacity. The validity of the theoretical results is confirmed by simulations. The results presented in this article can be very useful for communication system designers to optimize the performance of cooperative networks in wireless communication systems.

职业教育跨境推广与国际产能合作耦合系统架构

职业教育跨境推广与国际产能合作需加强耦合。职业教育跨境推广呈现出校企合作境外办学形式和办学品牌多样化、校企合作人才推广渠道趋于丰富、校企合作专业标准和专业课程推广数量增多等特点。但同时国际产能合作视域下职业教育跨境推广还存在一些问题,如国际化技能竞赛与国际产能合作衔接桥梁需要架构、科学研究服务国际产能合作能力有待提升、数字化服务国际产能合作领域亟待加强等。基于现实性、前瞻性和数字化等需求,需要架构职业教育跨境推广与国际产能合作耦合系统,并从激励机制、国际融入、智库建设、行业标准平台搭建、数字化引领、风险防范等维度,构建耦合系统实施的保障机制,推进职业教育服务国际产能合作效能的稳步提升。

基于合作博弈的风-光-电氢微网容量配置

当风电场、光伏电站、电氢混合储能系统分属不同的投资者时,微网容量配置存在微网整体运行最优与各投资者自身运行最优的矛盾,同时风、光出力的不确定性也会影响容量配置。针对上述问题,提出一种考虑风、光不确定性,基于合作博弈的风-光-电氢微网容量配置方法。首先,依据有序聚类和K-均值聚类提取出风-光-负荷典型月场景;其次综合考虑影响微网运行的因素,构建基于不同投资者的经济模型,在典型月场景下,分析完全合作博弈、部分合作博弈、非合作博弈模式下各投资者与联盟的收益关系;最后,以月净收益最高为优化目标,利用改进灰狼优化算法配置投资者装机容量,并基于shapley值分配合作联盟投资者收益。根据算例结果和关键参数灵敏度分析可知,微网在完全合作博弈模式下兼顾经济性与低碳性,且各投资者利益分配合理;电价、风光补贴价格的波动对各投资者影响不同。

从开发式援助到赋能式援助——中国国际发展合作范式变革研究

新中国成立以来,中国的对外援助形成了独特的中国路径。与其他大国相比,中国的对外援助坚持不附带任何政治条件,不干涉受援国内政,形成了开发式援助的独特路径。此种开发式援助在取得一定效果的同时,也存在不少问题,如可能导致受援国无法形成自主可持续发展的能力。随着中国综合国力和国际影响力不断提升,中国逐步从以国际主义理念为主导的对外援助向以共商共建共享理念为主导的国际发展合作转型。通过分析中国对非洲加纳的援助案例,发现:从开发式援助向国际发展合作转型是新时代中国对外援助的大势所趋,决定援助效果的关键因素是国际发展的治理体系设计和治理能力水平。新时代中国国际发展合作应高举全球南方的旗帜,在南南合作的框架下,在尊重受援国意愿的基础上,更加突出赋能式援助,重视完善与有关方开展优势互补、富有成效的三边和区域合作治理体系,不断提升发展合作的治理能力,共同推动全球减贫和可持续发展进程。

美日情报合作的成因、机制与特征分析

[研究目的]美日情报合作是美日两国同盟关系的重要体现。对美日情报合作的分析有助于更好把握美日同盟关系的走向,也有助于理解两国情报合作的背后逻辑,为中国应对提供参考。[研究方法]通过文献研究方法,对美日情报合作的驱动因素、法规框架、运行机制和实践特点进行研究。[研究结论]美日情报合作在合作范围、合作领域、合作模式上具有多边演进、多维立体、美主日从的特点。当前美日情报合作是以遏制中国为主要目标,中国应提高对美日情报合作的持久关注度,从硬件和体制等层面全面提升自身情报和反情报能力。

中国和马来西亚产能合作及贸易增长因素研究

随着“一带一路”倡议和《区域全面经济伙伴关系协定》(RCEP)的实施,中国和马来西亚双方贸易持续增长。研究中马之间的贸易关系有助于加深我们对两国贸易互动的理解,为两国贸易持续健康发展提供有益参考。本文主要使用UNcomtrade数据,以10类产业为切入点,首先运用指数分析法分析两国贸易的互补性和竞争性,然后采用修正的恒定市场份额模型(CMS模型)分解了中国对马来西亚出口的贸易增长因素,并得出如下结论:中马优势产业相似性与互补性共存,整体上中国对马来西亚的出口贸易具有较大的竞争压力;不同贸易增长因素对总效应的贡献值波动较大,但中国对马来西亚出口总效应呈上升趋势。最后结合研究结论,从产能合作和贸易增长因素两个方面提出促进两国贸易合作、优化两国贸易结构和增强两国贸易竞争力的对策建议。

中国与哈萨克斯坦贸易现状及竞争力研究——基于“一带一路”倡议提出十周年背景

基于UN Comtrade数据库SITC的Rev.4分类,构建了比较优势、竞争优势和互补优势的贸易竞争力综合指标体系,进而从总体产业和细分产业层面进行贸易竞争力研究。结果表明:2022年中国按原材料的制成品、机械运输设备和杂项制品三类产品具有比较优势和竞争优势,哈萨克斯坦非食用原料、燃料矿物品和按原材料的制成品三类产品具有比较优势和竞争优势;2022年中对哈按原材料的制成品和杂项制品具有互补优势,哈对中非食用原料和按原材料的制成品具有互补优势。通过对细分产业的进一步分析,提出了提升优势产业核心竞争力、提高互补产业合作水平、加强重点产业贸易联系、拓展其他类产业与沿线国家经贸合作、推动中哈产能合作全面发展等对策建议。

高等教育中外合作办学对城市创新能力的影响和作用机制

创新是引领发展的第一动力,提升城市创新能力是当前城市发展中亟待解决的重要问题。中外合作办学作为高等教育的重要组成部分,在区域创新中起着重要作用。基于三螺旋理论和知识溢出理论,高等教育中外合作办学通过人力资本效应、优质教育资源的引进而引发的竞争效应和传导效应以及产学研转化机制三个渠道提升城市创新能力。为充分发挥中外合作办学提升城市创新能力的作用,中外合作办学应加强对引进外籍教师的审核管理,政府应积极引导知识溢出的接受方主动接受知识溢出,加强学科建设。

考虑非合作博弈的货运列车编组调度决策分析

针对货运列车编组调度效率影响铁路运输能力瓶颈问题,通过抽象双向三级六场编组站货运列车编组调度过程,构建货运列车编组调度单目标整数规划模型,并尝试性地将博弈理论引入编组站编组调度决策过程中。所构建的模型以列车编组始发列车需满足的满长、满轴、时限要求为约束条件,以编组车辆在编组站平均中时最小化为目标函数,并运用非合作博弈理论,分析博弈决策场景下的调度决策问题。结合所构建的单目标整数规划模型,使求解结果更合理化。结合哈密东双向三级六场编组站规划改扩建,通过简化编组调度场景,以到达解体列车为例,分析所提方法的可行性,该方法对铁路工程设计中编组站改扩建、铁路运输能力计算、列车运行图铺画具有一定参考借鉴意义。