A Novel Extreme Learning Machine based Denoising Algorithm

Zhiyong Fan,Quansen Sun,Feng Ruan,Kai Hu,Jin Wang 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.2

We introduce a fast and effective algorithm extreme learning machine (ELM) and apply it to image denoising. GA-ELM algorithm we proposed uses genetic algorithm(GA) to decide weights and bias in the ELM. It has better global optimal characteristics than traditional optimal ELM algorithm. In this paper, we used GA-ELM to do image denosing researching work. Firstly, this paper uses training samples to train GA-ELM as the noise detector. Then, we utilize the well-trained GA-ELM to recognize noise pixels in target image. And at last, an adaptive weighted average algorithm is used to recover noise pixels recognized by GA-ELM. Experiment data shows that this algorithm has better performance than other denosing algorithm.

An Improved Image Denoising Algorithm based on Shearlet

Zhiyong Fan,Quansen Sun,Feng Ruan,Yiguang Gong,Zexuan Ji 보안공학연구지원센터(IJSIP) 2013 International Journal of Signal Processing, Image Vol.6 No.4

An Image Filter Arithmetic based on GA, PDE and TV

Zhiyong Fan,Quansen Sun,Zexuan Ji,Feng Ruan,Liling Zhao 보안공학연구지원센터 2013 International Journal of Future Generation Communi Vol.6 No.5

Energy Efficient Strategies with Mobile Sink for WSNs : A Survey

Feng Ruan,Zhiyong Fan,Yiguang Gong,Jianmin Hou,Ping Mei,Tao Li 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.8

Sink mobility has been widely used to reduce the energy consumption of sensor nodes, which can prolong the lifetime of nodes in wireless sensor networks (WSNs). Researchers found that sink mobility can improve the stability, throughput and lifetime of the very large-scale WSNs. However, sink mobility also causes issues such as data latency and communication overhead. With these properties sink mobility remains more research efforts under different requirements. In this paper we present a survey of energy efficient strategies in WSNs with mobile sink. Firstly, we investigate the existing issues in WSNs. Then we focus on the problem of energy efficient data gathering strategy with mobile sink and present some existing solutions. Finally, we conclude this paper with some potential extensions which need to be further explored.

Study of Concurrency Message Bus based on Adaptive Communication Environment Framework

Feng Ruan,Tao Li,Zhiyong Fan,Jin Wang 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.6

Message middleware is an important branch of middleware, it provides the development of distributed application system with an asynchronous, pine for programming architecture, the consistent thought and the development trend of modern software technology, which is widely used in industry in the enterprise application integration and distributed computing. Message bus message middleware is a kind of simple implementation, but with its unique advantages for a wide variety of distributed applications development injected with strong power, greatly promote the development of application system integration. This paper is mainly focusing on the key issues involved in the middleware, message bus, and concurrency model for further research.

Research and utilization of medicinal insects in China

Ying FENG,Min ZHAO,Zhao HE,Zhiyong CHEN,Long SUN 한국곤충학회 2009 Entomological Research Vol.39 No.5

The research and utilization of medicinal insects in China is introduced briefly in this paper. Medicinal insects have been used to treat human diseases from ancient times. There are approximately 300 medicinal insects species distributed in 70 genera, 63 families and 14 orders at present. An estimated 1700 traditional Chinese medicine prescriptions include medicinal insects or insect-derived crude drugs. Many insect-derived compounds have been studied and show efficient therapeutic functions. Techniques for mass rearing and cultivation of medicinal insects have been developed in order to have sufficient quantities of medicinal insects. Suggestions are made towards the uses of medicinal insects and it is proposed that insects will be a main resource for the future discovery of new drugs.

The Asymptotic Throughput and Connectivity of Cognitive Radio Networks with Directional Transmission

Wei, Zhiqing,Feng, Zhiyong,Zhang, Qixun,Li, Wei,Gulliver, T. Aaron The Korea Institute of Information and Commucation 2014 Journal of communications and networks Vol.16 No.2

Throughput scaling laws for two coexisting ad hoc networks with m primary users (PUs) and n secondary users (SUs) randomly distributed in an unit area have been widely studied. Early work showed that the secondary network performs as well as stand-alone networks, namely, the per-node throughput of the secondary networks is ${\Theta}(1/\sqrt{n{\log}n})$. In this paper, we show that by exploiting directional spectrum opportunities in secondary network, the throughput of secondary network can be improved. If the beamwidth of secondary transmitter (TX)'s main lobe is ${\delta}=o(1/{\log}n)$, SUs can achieve a per-node throughput of ${\Theta}(1/\sqrt{n{\log}n})$ for directional transmission and omni reception (DTOR), which is ${\Theta}({\log}n)$ times higher than the throughput with-out directional transmission. On the contrary, if ${\delta}={\omega}(1/{\log}n)$, the throughput gain of SUs is $2{\pi}/{\delta}$ for DTOR compared with the throughput without directional antennas. Similarly, we have derived the throughput for other cases of directional transmission. The connectivity is another critical metric to evaluate the performance of random ad hoc networks. The relation between the number of SUs n and the number of PUs m is assumed to be $n=m^{\beta}$. We show that with the HDP-VDP routing scheme, which is widely employed in the analysis of throughput scaling laws of ad hoc networks, the connectivity of a single SU can be guaranteed when ${\beta}$ > 1, and the connectivity of a single secondary path can be guaranteed when ${\beta}$ > 2. While circumventing routing can improve the connectivity of cognitive radio ad hoc network, we verify that the connectivity of a single SU as well as a single secondary path can be guaranteed when ${\beta}$ > 1. Thus, to achieve the connectivity of secondary networks, the density of SUs should be (asymptotically) bigger than that of PUs.

The Asymptotic Throughput and Connectivity of Cognitive Radio Networks with Directional Transmission

Zhiqing Wei,Zhiyong Feng,Qixun Zhang,Wei Li,T. Aaron Gulliver 한국통신학회 2014 Journal of communications and networks Vol.16 No.2

Throughput scaling laws for two coexisting ad hoc networkswith m primary users (PUs) and n secondary users (SUs)randomly distributed in an unit area have been widely studied. Early work showed that the secondary network performs as wellas stand-alone networks, namely, the per-node throughput of thesecondary networks is (1/pn log n). In this paper, we showthat by exploiting directional spectrum opportunities in secondarynetwork, the throughput of secondary network can be improved. If the beamwidth of secondary transmitter (TX)’s main lobe is= o(1/log n), SUs can achieve a per-node throughput of(1/pn log n) for directional transmission and omni reception(DTOR), which is (log n) times higher than the throughputwithoutdirectional transmission. On the contrary, if = !(1/log n),the throughput gain of SUs is 2 / for DTOR compared with thethroughput without directional antennas. Similarly, we have derivedthe throughput for other cases of directional transmission. The connectivity is another critical metric to evaluate the performanceof random ad hoc networks. The relation between the numberof SUs n and the number of PUs m is assumed to be n = m . We show that with the HDP-VDP routing scheme, which is widelyemployed in the analysis of throughput scaling laws of ad hoc networks,the connectivity of a single SU can be guaranteed when> 1, and the connectivity of a single secondary path can be guaranteedwhen > 2. While circumventing routing can improve theconnectivity of cognitive radio ad hoc network, we verify that theconnectivity of a single SU as well as a single secondary path canbe guaranteed when > 1. Thus, to achieve the connectivity ofsecondary networks, the density of SUs should be (asymptotically)bigger than that of PUs.

Power Allocation Schemes For Downlink Cognitive Radio Networks With Opportunistic Sub-channel Access

( Ding Xu ),( Zhiyong Feng ),( Ping Zhang ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.7

This paper considers a downlink cognitive radio (CR) network where one secondary user (SU) and one primary user (PU) share the same base station (BS). The spectrum of interest is divided into a set of independent, orthogonal subchannels. The communication of the PU is of high priority and the quality of service (QoS) is guaranteed by the minimum rate constraint. On the other hand, the communication of the SU is of low priority and the SU opportunistically accesses the subchannels that were previously discarded by the PU during power allocation. The BS assigns fractions α and 1-α of the total available transmit power to the PU and the SU respectively. Two power allocation schemes with opportunistic subchannel access are proposed, in which the optimal values of α`s are also obtained. The objective of one scheme is to maximize the rate of the SU, and the objective of the other scheme is to maximize the sum rate of the SU and the PU, both under the PU minimum rate constraint and the total transmit power constraint. Extensive simulation results are obtained to verify the effectiveness of the proposed schemes.

Influence of Sodium Chloride on Thermal Denaturation of a High-Salt-Tolerant Neutral Protease from Aspergillus oryzae

Dong Wang,Zhiyong Zheng,Jie Feng,Xiao-Bei Zhan,Li-Min Zhang,Jian-Rong Wu,Chi-Chung Lin,Li Zhu 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.5

The temperature and pH stability of proteases have been extensively investigated. A neutral protease produced by Aspergillus oryzae was thermodynamically characterized at high-salt environment. When the protease was tested at 24% NaCl and 60oC, its half-life was increased to 30.0 min, 111% longer than that of control. Its Gibbs free energy and activation energy for denaturation in high NaCl concentration solutions were higher than in low salt solutions and increased by 2.1 and 4.75 kJ/mol,respectively. The protease exhibited higher thermal stability in higher salt conditions. This feature is beneficial to soybean sauce fermentation by enhancing the protease performance and taste of the product. Analysis by farultraviolet circular dichroism (far-UV CD) spectroscopy revealed that α-helix conformation in the protease increased from 3.2 to 31.7%, respectively, when the NaCl concentration increased from 0 to 18%, in agreement with the results deduced by thermodynamic calculations.