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Articles by Gang Wang
Total Records ( 8 ) for Gang Wang
  Yonglin Wang , Yaping Lin , Shengye Huang , Gang Wang and Rui Li
  Routing update is a severe problem for Ternary Content-Addressable Memories (TCAMs) based systems. This study is focused on designing a power efficient and fast updating algorithm for the partitioned TCAMs in IP forwarding systems. TCAMs are usually partitioned into individual buckets for their high power consumption. Due to routing rules change quickly, keeping the latest routing table may cause the partitioned TCAM buckets to overflow and bring additional power consumption. In order to improve the performance of the routing update, an efficient updating algorithm for the partitioned TCAMs is proposed in this study. In the algorithm, free space added for update traces is provided according to the distribution of the routing rules. The problem of buckets overflow is solved by dynamically adjusting the free space. Furthermore, the update speed is accelerated through arranging the free space of each partitioned bucket. Compared with the algorithm which increase the partitioned buckets by k (k is a fixed constant) times, the experimental results show the proposed algorithm is faster and more power efficient.
  Georgia Rugumira , Gang Wang and Nguyen Thi Dieu Linh
  Precoded orthogonal frequency division multiplexing (Precoded-OFDM) and vector-OFDM (VOFDM) systems was proposed to eliminate channel spectral nulls and reduce the cyclic prefix length by V times in a single transmit antenna systems, respectively. However, the insertion of one or more zeros between each two sets of V consecutive information symbols in precoded-OFDM expands the data rate overhead of the system hence high Peak to Average Power Ratio (PAPR). VOFDM system does not shown good performance in the spectral nulls channels. This study merges the VOFDM with carrier interferometry code (CI-VOFDM) to improve the performance of OFDM system in intersymbol interference (ISI) channel. The simulation results show a great improvement in terms of Bit Error Rate (BER) performance in the CI-VOFDM system.
  Nguyen Thi Dieu Linh , Gang Wang , Min Jia and Georgia Rugumira
  Because of the excellent error- correcting capability and optional error correct code, Low-Density Parity-Check (LDPC) codes have received great attention recently. LDPC codes can be decoded by an iterative decoding algorithm as Belief Propagation Algorithm or Message Passing Algorithm. In this paper, the extended analysis of Sum-Product algorithm (SPA) and Min-Sum algorithm (MSA) using Stopping node method is introduced. This method based on SPA using stopping node to reduce the computing complexity on LDPC code is presented, and it has also been proposed to be applied to MSA. Moreover, how to remove the effect of short cycles to improve the quality of LDPC decoder and how to make early decisions on the next iteration to reduce the number of calculations are presented in this paper. Simulations show that the stopping node algorithm not only offers a better performance but also decreases processing time by factor of 5 times under BPSK scheme and nearly 10 times under QPSK scheme by comparison with standard MSA and SPA.
  Bo Li , Gang Wang , Hongjuan Yang and Rongkuan Liu
  Physical-layer Network Coding (PNC) has drawn so much attention of wireless communication researchers. However, most of the studies focused on symmetric Two-Way Relay Communication (TWRC) systems. In order to analyze the performance of PNC in asymmetric scenario, in this study, we classify TWRC systems with Rayleigh fading channels into five asymmetric cases according to different poor channel allocation. In each symmetric and asymmetric case, we provide the detailed signal transmission and processing progress. Then we simulate the Bit Error Rate (BER) performance of PNC either in symmetric or asymmetric cases. From the results, we know that the Phase Asymmetry-Uplink (PA-U) case is the worst and Downlink Channel Asymmetry (DCA) case is the best among the five asymmetric cases. We also conclude that poor uplink channels will provide more severe effect to the performance degradation caused by system asymmetry than poor downlink ones.
  Zhaogang Han , Zhang Li , Huang Wenqing and Gang Wang
  Due to company mergers and business to business interoperability, there is a need for model transformations in the area of business process modeling to facilitate scenarios like model integration and model synchronization. General model transformation approaches do not consider the special properties of business process models and horizontal transformation scenarios. Since different business process modeling languages use different modeling elements and syntax constraints, a business process may have very different representations in different languages. So in many cases it is not easy to transform business process models correctly only using an element-2-element mapping. In order to solve this problem and improve the correction rate of horizontal business process model transformation, in this work we propose CP-BPMT(Control-flow Pattern based Business Process Model Transformation), a horizontal business process model transformation approach in which the operation granularity has been increased from model elements to model fragments illustrating certain control-flow patterns. CP-BPMT is feasible in practice and it can generate transformation results better than element-based approaches. In order to illustrate CP-BPMT approach, a UML-AD2YAWL case study is conducted.
  Xiaoming Liu , Gang Wang and Chuang Zhang
  By using the wireless broadcast, cooperative communication has this advantage to confront the severe fading effect on wireless communication. Resource allocation is one of the most important challenges in cooperation. In this study, we propose a Nash Bargaining Solution (NBS) based cooperation scheme to optimal allocate resources for cooperation. In this symmetric cooperative network, nodes can act as both a data transmitter and a relay for each other and determine the amount of resources to share with its partner. We formulate this cooperative problem as a 2-person barging problem and analyze the proper channel condition for 2 nodes to share their resource for cooperation. Simulation results show that the proposed scheme could improve the system performance and the questions that when to cooperate and how to cooperate were answered.
  Shujie Wang , Liqin Li , Siguo Liu , Yonggang Liu , Yingfang Qi , Gang Wang , Yongqiang Jiang and Xuehui Cai
  Streptococcus suis (S. suis) secreted numerous proteins are virulence-associated factors that play critical roles in infection. Studies of S. suis secreted proteins have been reported in S. suis Serotype 2 (SS2) strains and S. suis Serotype 9 (SS9) strains. However, data is still scarce. In this study, a comparative proteomics approach was used to distinguish the profiles of the secreted proteins in different virulent SS7 strains. Consequently, 13 individual proteins that were unique to either high pathogenic 07WC11 strain or low pathogenic SJZB408 strain in 2D gels were successfully identified. In addition, researchers attempted to compare the amount of expression 10 identified protein genes (pft, rsp, cms, esp, hpk, pk, rpp, rrf, tef, tis) by quantitative Reverse Transcription Polymerase Chain Reaction (qRT-PCR). Real-time RT-PCR results showed that pft, rsp, cms, esp, pk, rpp, rrf and tef mRNA expression amount in low pathogenic SS7 strain was lower than in high pathogenic SS7 strain which is accord with the results of 2D. Thus, researchers defined these eight proteins as different expression proteins between low pathogenic and high pathogenic SS7 strain.
  Gang Wang , Shu Li , Yungen Fang and Xiaoqing Zeng
  In the current operation and control system of trains on the rail transit system, the accuracy of speed and distance measurement is not high and there is a large difference between the measured result and actual situation, because it is generally determined by the fixed adhesive force configured in the system, especially in the condition of idling in low-speed situations and the slipping when braking in high-speed situations. In this study, the redundant convolution fault-tolerant analysis was proposed for self-inspection of speed to identify whether the speed and distance measuring equipment is working normally and the safety redundancy structure of the coding odometer and radar was proposed to guarantee the reliability of speed and distance measurement. In this way, the accuracy of speed and distance measurement was improved and the safety of the train and the comfortableness of passengers was ensured. The proposed method was verified in the simulation environment.
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