基于COM组件的水位等值线自动生成方法的研究与实现

针对目前利用Surfer软件接口进行等值线生成的重复开发问题,提出了生成等值线COM组件的观点。首先分析了Surfer Automation对象模型结构和COM组件原理,然后详细描述了等值线COM组件的设计、算法的实现、接口参数的说明和关键代码,同时给出了COM组件的具体生成过程。最后通过实际工程应用表明,采用COM组件技术能对等值线绘制方法进行有效封装,调用方便,提高了开发效率,且图形绘制效果好。     

内涝型流域洪灾洪水模拟

本文讨论内涝型流域的特点和流域模拟概化的方法，建立了内涝型流域洪灾洪水模拟数值模型软件，并以太湖流域为试验区进行了应用，结果表明了模型的可行性和有效性，且具有可扩充性、可移值性和通用性。     

Subcarrier-pair Based Power Allocation for Cooperative OFDM AF Multi-Relay Networks

For conventional subcarrier pairing schemes in cooperative orthogonal frequency division multiplexing amplify and forward multi-relay networks, to avoid interference, each subcarrier pair (SP) is assigned to only one relay. Over a specific subcarrier, the destination receives signals transmitted from only one relay. In our subcarrier pairing scheme, we assign each SP to all the relays. Thus, over a specific subcarrier, the destination receives signals transmitted from all the relays. Since it is assumed that there exists the direct link from the source to the destination, we assume that the source also transmits signals during the second time slot for the direct transmission mode. We propose an enhanced joint subcarrier pairing and power allocation optimization scheme which maximizes the transmission rate subject to total network power constraint. The problem is simplified and solved by using dual method. It is shown from simulation results that our proposed scheme outperforms the other schemes.     

Resource allocation for OFDM relay systems with statistical QoS guarantees

By integrating the concept of effective capacity, we propose the resource allocation schemes for subcarrier‐pair based OFDM decode‐and‐forward and amplify‐and‐forward relay systems for quality‐of‐service (QoS) guarantees. The objective is to maximize the system throughput subject to a given statistical delay QoS constraint. First, we pair the subcarriers over the source‐relay channel and the relay‐destination channel by the descending order of the subcarriers' channel gains. Second, by making use of the derived equivalent end‐to‐end channel gains of the subcarrier pairs, we apply joint water‐filling power allocation over the subcarrier pairs and then partition the power of the subcarrier pairs between the source and the relay. We prove that as the equivalent end‐to‐end channel gains of the subcarrier pairs are given, the combination of sorted subcarrier pairing and joint water‐filling power allocation is jointly optimal to maximize the effective capacity. The simulation results show that our proposed schemes achieve the highest effective capacity for OFDM decode‐and‐forward and amplify‐and‐forward relay systems as compared with other existing schemes. The results also verify that our proposed schemes can efficiently provide different levels of delay QoS guarantees, even if under the stringent delay QoS constraints. Copyright © 2012 John Wiley & Sons, Ltd.     

多用户多载波无线携能通信系统的上下行联合资源分配

无线携能通信(SWIPT)技术是解决无线网络能量受限问题的有效方法,该文研究一个由基站(BS)和多用户组成的多载波SWIPT系统,其上行和下行链路均采用正交频分复用(OFDM)技术。在下行链路中,基站向用户同时进行信息与能量传输;在上行链路中,用户利用从基站接收的能量向基站回传信息。该文以最大化上下行加权和速率为目标,联合优化上行和下行的子载波分配和功率分配,提出基于拉格朗日对偶法和椭球法的最优联合资源分配算法。计算机仿真结果证实了该算法的有效性。     

3DPointCaps++: Learning 3D Representations with Capsule Networks

International Journal of Computer Vision - We present 3DPointCaps++ for learning robust, flexible and generalizable 3D object representations without requiring heavy annotation efforts or...     

OFDM中继系统的传输策略选择与资源分配

提出传输策略选择结合资源分配的迭代算法,证明其收敛性。进一步将算法简化为顺序进行的三步：子信道指配,传输策略选择和中继的发射功率分配,源的发射功率分配。仿真结果表明,所提资源分配迭代方案和简化方案的频谱效率性能均优于已有的两种资源分配方案,简化方案更适合实际应用。     

超标禁售大限过引导管理任务重——探访华东板材市场后的思考

根据国家质检总局颁布《室内装饰装修材料10项有害物质限量》的规定，从今年7月1日起，我国禁止有害物质超标的建筑材料在市场上销售。大限已过半月，记者来到全国三大板材生产基地之一、曾经号称“天下第一板材市场”的山东临沂华东板材市场探访究竟。　　走进市场，一阵刺鼻的气味扑面而来；采访了几个摊位，记者被呛得眼泪直流。问是否已经使用了环保胶，有的摇头否定；有的闪烁其词说产品正在送检；有的指着刚贴上去的环保标志，问其哪里发的扭头走开了之。　　据了解，临沂地处沂蒙山区，林业资源丰富，目前板材企业大大小小3000多…     

Proactive Eavesdropping via Pilot Contamination and Jamming

Proactive eavesdropping is a new paradigm shift in wireless physical layer security from preventing conventional eavesdropping attacks to legitimate intercepting suspicious communications, which has attracted a lot of attention recently. Pilot contamination is one effective technique in proactive eavesdropping, which spoofs the suspicious transmitter on channel estimation by sending the same pilot signal as the suspicious receiver, and lets it leak information in the direction of the legitimate eavesdropper during its transmission. However, this technique may fail when an anti-pilot-contamination mechanism called “energy ratio detector (ERD)” is applied at the suspicious receiver. To deal with the case that the suspicious receiver is a smart device using ERD, in this paper, we study using pilot contamination along with jamming to improve the legitimate eavesdropping performance. We first derive a closed-form expression for the probability of pilot contamination being detected by the suspicious receiver, and use it to obtain a closed-form expression for the eavesdropping rate. Using this theoretical analysis result, we propose an algorithm to maximize the eavesdropping rate by jointly optimizing the pilot contamination power and jamming power via two-dimensional search. Simulation results show that the proposed eavesdropping rate maximization algorithm can significantly improve eavesdropping rate, as compared to other benchmark schemes.     

Balance between strength and ductility of dilute Fe2B by high-throughput first-principles calculations

In boride ceramics, Fe₂B typically functions as the primary wear-resistant phase owing to its high hardness, but the elastic and ductile-brittle properties of Fe₂B greatly influence its wear resistance and industrial application. First-principles calculations using density functional theory (DFT) were utilized to systematically investigate the effects of Al, Si, and transition elements (including 3d, 4d, and 5d transition elements) on the mechanical properties and electronic structure of Fe₃₁MB₁₆ with a dilute solution model. The bulk modulus (B), shear modulus (G), and Young's modulus (E) were calculated through the stress-strain method. The Vickers hardness (H_V) and fracture toughness (K_IC) were calculated by semi-empirical models. The electronic structures and chemical bonding were analyzed using the charge density difference, electron localization function, and Mulliken bond population. Overall, Fe₃₁YB₁₆ had the largest moduli (B, G, and E) among all the Fe₃₁MB₁₆ compounds that were investigated, while Fe₃₁CrB₁₆ had the highest hardness. Compared with pure Fe₂B, the ductility of Fe₃₁MB₁₆ improved to varying degrees according to the B/G and Poisson's ratio (σ) criteria, respectively. However, adding alloying elements in this concentration did not change the intrinsic brittleness of Fe₂B. Moreover, the trends in the calculated K_IC of Fe₃₁MB₁₆ (M = Cr, Mn, Mo, and W respectively) were consistent with those of experiments. The electronic structure and Mulliken population analysis showed that the differences in the mechanical properties of the Fe₃₁MB₁₆ compounds were primarily determined by the M-B and B–B bonds because the alloying element M replaced Fe. These results provide guidance for improving the ductility of Fe₂B and its industrial application.