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Articles by Z. Wu
Total Records ( 3 ) for Z. Wu
  X Martin , R. M Salomon and Z. Wu
 

We hypothesize that several characteristics of a country’s institutional environment encourage firms to agglomerate. To test our hypotheses, we examine the collocation pattern of 931 plant investments made by 266 firms across 29 countries in the global semiconductor industry from 1975 to 2004. The results show that the decision to agglomerate is strongly dependent on a country’s institutional context. Specifically, firms prefer to agglomerate when investing within countries with collectivist cultures, and those characterized by political and economic uncertainty. We assess the robustness of the results across multiple indicators of these institutional conditions.

  L. Zhou , G. Cui , H. Liu , D. Luo and Z. Wu
  The Nth-Powered P-persistent Broadcast protocol (NPPB) is a probabilistic broadcasting scheme, which is designed to alleviate broadcast storms and support effective emergency message disseminations in dense VANETs. In this protocol, a probability p is calculated by the receiver to decide whether it should rebroadcast or not. This method reduces the rebroadcast probabilities more efficiently, which can alleviate the serious competitions and collisions. Comparative analyses have been done in two aspects to compare the new NPPB with traditional schemes. And a saturated traffic jam scenario is established to evaluate the NPPB scheme. Simulations results show that if the value of n is selected appropriately, NPPB can achieve higher performance such as less delay, fewer hops, lower load and higher throughput, at the same time the reliability can be guaranteed.
  Z. Wu , N. Zhao , G. Ren and T. Quan
  In this study, the advanced unified spread spectrum Telemetry Tracking and Control (TT and C) system (USSTTCS) in aerospace industry is introduced and the anti-interference strategies of it are reviewed. In USSTTCS, the inherent ranging ability of pseudo-noise code and the speciality of spread spectrum modulation make the complete unification realized, including measurement of range, velocity and angle as well as telemetry, telecontrol and communication functions. With Code Division Multiple Access (CDMA) system applied, the signal and equipment of multi-target or multi-station TT and C can be unified easily in USSTTCS. In USSTTCS, there are several kinds of interference, including narrowband interference, multiple access interference, multipath interference and near-far effect and there kinds of interference affect the performance of USSTTCS greatly. In this study, several kinds of interference in USSTTCS are introduced and then the strategies which can mitigate these kinds of interference in the USSTTCS are reviewed with their performance analyzed.
 
 
 
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