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Search Results: 1 - 10 of 54379 matches for " HUI Feng "
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The Role Transition Researches of the Government in Public Service Outsourcing  [PDF]
Hui Wu, Feng Pan, Yue Zhang
Open Journal of Business and Management (OJBM) , 2015, DOI: 10.4236/ojbm.2015.34047
Abstract: Public service outsourcing is a modern public service supply pattern, which the government takes advantage of the market and society to product and supply public services. Because of the characters of innovation, fashion and practicability, public service outsourcing has shown its multiple values and has been popular with the local government. The government mainly plays the role in rule-maker, public service-buyer and order-supervisor. However, in the process of role transition, our government faces ideological, institutional and ability obstacles, either. Therefore, with the purpose of reducing government outsourcing obstacles and improving the level of government management and service, this paper tries to establish a relatively complete system of public service outsourcing and offers several suggestions including perfecting the institutional construction, establishing diversified safeguard mechanisms and strengthening the construction of the government to build a service-oriented government.
On Synchronization of Pinning-Controlled Networks with Reducible and Asymmetric Coupling Matrix  [PDF]
Xuan Zhou, Hui Feng, Jianwen Feng, Yi Zhao
Communications and Network (CN) , 2011, DOI: 10.4236/cn.2011.32014
Abstract: This paper investigates the synchronization of directed networks whose coupling matrices are reducible and asymmetrical by pinning-controlled schemes. A strong sufficient condition is obtained to guarantee that the synchronization of the kind of networks can be achieved. For the weakly connected network, a method is presented in detail to solve two challenging fundamental problems arising in pinning control of complex networks: (1) How many nodes should be pinned? (2) How large should the coupling strength be used in a fixed complex network to realize synchronization? Then, we show the answer to the question that why all the diagonal block matrices of Perron-Frobenius normal matrices should be pinned? Besides, we find out the relation between the Perron-Frobenius normal form of coupling matrix and the differences of two synchronization conditions for strongly connected networks and weakly connected ones with linear coupling configuration. Moreover, we propose adaptive feedback algorithms to make the coupling strength as small as possible. Finally, numerical simulations are given to verify our theoretical analysis.
A New Design of Access Control in Wireless Sensor Networks
Hui-Feng Huang
International Journal of Distributed Sensor Networks , 2011, DOI: 10.1155/2011/412146
Abstract: Nodes in a sensor network may be lost because of power exhaustion or malicious attacks. To extend the span of sensor network, new nodes deployment is necessary. To prevent malicious nodes from joining the sensor networks, access control is a designed requirement for controlling sensor node deployment. Based on elliptic curve cryptography (ECC), this paper presents a new access control protocol for secure wireless sensor networks. The proposed scheme not only prevents malicious nodes from joining sensor networks, but also key establishment is included in the authentication procedure. Compared to the previously proposed schemes, the authentication procedure and common key generation of the proposed method are very simple and efficient. It could offer computational efficiency, energy, and bandwidth savings. In addition, it can be easily implemented as a dynamic access control, because all the old secret keys and information in existing nodes should not be updated once a new node is added or an old node is lost. 1. Introduction Wireless sensor networks applied to the monitoring of physical environments have recently emerged as an important infrastructure. It usually consists of one or more base stations and lots of sensor nodes, which are densely deployed either inside the phenomenon or very close to it. To save manufacturing, a sensor node is usually built as a small device, which has limited memory, a low-end processor, and is powered by a battery [1]. The position of sensor nodes need not to be engineered or predetermined. This allows random deployment in inaccessible terrain or disaster relief operations. Therefore, sensor networks are being deployed for a wide variety of applications, including military sensing and tracking, patient monitoring, and environmental monitoring, and airport and home security [1, 2]. Owing to the property of sensor devices, sensor networks may easily be compromised by adversaries who modify messages or provide misleading information to other sensor nodes. To prevent information and communication systems from illegal delivery and modification, the receiver must authenticate messages transmitted from the sensor nodes over a wireless sensor network. Because of the sensor devices, after several days or weeks of operation, some nodes in the network may exhaust their power or lost. That is, nodes in a sensor network may exhaust their battery or be stolen by malicious attacks. In addition, some nodes may be destroyed by adversaries so that the entire network may become useless. To extend the lifetime of the sensor network, new node
Eco-Evolutionary Feedback and the Invasion of Cooperation in Prisoner's Dilemma Games
Feng Zhang, Cang Hui
PLOS ONE , 2011, DOI: 10.1371/journal.pone.0027523
Abstract: Unveiling the origin and forms of cooperation in nature poses profound challenges in evolutionary ecology. The prisoner's dilemma game is an important metaphor for studying the evolution of cooperation. We here classified potential mechanisms for cooperation evolution into schemes of frequency- and density-dependent selection, and focused on the density-dependent selection in the ecological prisoner's dilemma games. We found that, although assortative encounter is still the necessary condition in ecological games for cooperation evolution, a harsh environment, indicated by a high mortality, can foster the invasion of cooperation. The Hamilton rule provides a fundamental condition for the evolution of cooperation by ensuring an enhanced relatedness between players in low-density populations. Incorporating ecological dynamics into evolutionary games opens up a much wider window for the evolution of cooperation, and exhibits a variety of complex behaviors of dynamics, such as limit and heteroclinic cycles. An alternative evolutionary, or rather succession, sequence was proposed that cooperation first appears in harsh environments, followed by the invasion of defection, which leads to a common catastrophe. The rise of cooperation (and altruism), thus, could be much easier in the density-dependent ecological games than in the classic frequency-dependent evolutionary games.
An experimental serum pharmacological study on an application method in traditional Chinese medicine for treatment and prevention of asthma
Hui-feng SHEN
Zhong Xi Yi Jie He Xue Bao , 2007,
Abstract: Objective: To study the mechanism of herbal application along meridians for treatment and prevention of asthma by using serum pharmacological test to observe the effects of serum containing herbs against the constriction of tracheal spiral strips induced by acetylcholine chloride (Ach). Methods: Guinea pigs were randomly divided into normal control group, normal saline (NS) application group, aminophylline application group, aminophylline injection group, 1-day herb application group, 7-day herb application group and 14-day herb application group. Asthma was induced by Hutson's method in guinea pigs except the normal control group. Guinea pigs in herb application groups were treated by external application of a compound herbal medicine 60 min once every day. Guinea pigs in NS application group were treated by external application of NS. Guinea pigs in the two aminophylline-treated groups were treated by external application and intraperitoneal injection of aminophylline at a dose of 400 mg/kg, respectively. The guinea pigs were killed and the sera were obtained after 1-day, 7-day and 14-day treatment in the three herb application groups, 7-day treatment in the NS application group, the aminophylline application and injection groups, respectively. Serum pharmacological method was used to do the experiment, the effects of different sera on the constriction of tracheal strips were observed, and the constriction rates were calculated. Result: The serum containing herbs had an effect in reducing the constriction of tracheal spiral strips induced by Ach, and the effect was similar to that of the serum obtained from the aminophylline injection group. The constriction rate of the tracheal spiral strips was decreased when herbal application treatment was prolonged within a period of time, and it became stable when herbal application treatment was between 7-14 days. The constriction of tracheal spiral strips induced by Ach could be reduced remarkably when it was previously treated by serum containing herbs. Conclusion: The anti-acetylcholine function with a time-dependent effect is one of the mechanisms of herbal application treatment along meridians for asthma, and furthermore, herbal application treatment along meridians might be useful for preventing asthma.
A 105 dB DR, -101 dB THD+N Sigma-Delta Audio D/A converter with A Noise-shaping Dynamic Element Matching Technique
Hui Feng,Zeqi Yu
Journal of Computers , 2010, DOI: 10.4304/jcp.5.2.194-201
Abstract: A Sigma-Delta audio digital-to-analog (D/A) converter with a noise-shaping dynamic element matching (NSDEM) technique is presented. The proposed NSDEM technique has the advantage of less computation and also can be implemented with all-digital circuits easily. The converter is fabricated in a 0.35 μm CMOS process, occupies 2.85 mm2, and achieves 105 dB dynamic range -101 dB total harmonic distortion plus noise.
Enumerative Encoding of TMTR Codes for Optical Recording Channel
Tsai Hui-Feng
EURASIP Journal on Advances in Signal Processing , 2010,
Abstract: We propose a new time-varying maximum transition run (TMTR) code for DVD recording systems, which has a rate higher than the EFMPlus code and a lower power spectral density (PSD) at low frequencies. An enumeration method for constructing the new TMTR code is presented. Computer simulations indicate that the proposed TMTR code outperforms the EFMPlus code in error performance when applied to partial response optical recording channels.
Enumerative Encoding of TMTR Codes for Optical Recording Channel
Hui-Feng Tsai
EURASIP Journal on Advances in Signal Processing , 2010, DOI: 10.1155/2010/695237
The Role of Multimodality Imaging Techniques on Differential Diagnosis of Precancerous Nodules and Hepatocellular Carcinoma  [PDF]
Hui-Jie Jiang, Xiao-Feng Li
International Journal of Medical Physics,Clinical Engineering and Radiation Oncology (IJMPCERO) , 2012, DOI: 10.4236/ijmpcero.2012.13009
Abstract: In recent years, the incidence of hepatocellular carcinoma (HCC) has been increasing worldwide, and its high mortality seriously threatens public health. Early detection and treatment are crucial to improving the survival rate. Imaging examination widely used for the diagnosis of HCC and provides a non-invasive means of tumor visualization. The rapid development of medical imaging technology is expected to improve early-stage diagnosis rates for HCC. This article summarizes the methods for the differential diagnosis of premalignant dysplastic nodule (DN) and small hepatocellular carcinoma during the carcinogenesis of cirrhosis and reviews their application. In addition, a discussion on some recently patented medical imaging development was also presented.
An Integrated Analysis of Aberrantly Expressed miRNA and mRNA Profiles Unveils a Robust Regulatory Network in HepG2 Cell  [PDF]
Sheng Yang, Hui Zhang, Li Guo, Yang Zhao, Feng Chen
Engineering (ENG) , 2013, DOI: 10.4236/eng.2013.510B011

As crucial negative regulatory small non-coding molecules, microRNAs (miRNAs), have multiple biological roles. The abnormal expression of specific miRNAs may contribute to the occurrence and development of tumor. Here, based on HepG2 and L02 cells, we attempted to demonstrate the potential regulatory network of aberrantly expressed miRNA profiles, interaction between miRNA and mRNA, and potential functional correlation between different miRNAs. De-regulated miRNA and mRNA expression profiles were completely surveyed and identified by applying deep sequenc-ing and microarray techniques, respectively. The genome-wide and integrative analysis of miRNA-mRNA was performed based on their functional relationship according to experimentally validated and predicted targets. Nearly 50% targets were negatively regulated by at least 2 aberrantly expressed miRNAs. Similar results were obtained based on experimentally validated and predicted targets. Compared with abnormal miRNAs, their targets showed various expression patterns: stably expressed, down-regulated or up-regulated. Although the theoretical potential miRNA-mRNA interaction could be predicted, they showed consistent or inconsistent expression patterns. Both functional enrichment analysis of target mRNAs of dysregulated miRNAs and abnormal mRNA profiles suggested that corresponding pathways were involved in tumorigenesis. Moreover, to obtain potential functional relationships between different miRNAs, we also performed expression analysis of homologous miRNAs in gene families. Generally, they could co-regulate biological processes with similar roles. The integrative analysis of miRNA-mRNA indicated a complex and flexible regulatory network. The robust network mainly derived from multiple targets for a specific miRNA (and vice versa), each mRNA and co-regulation roles of different miRNAs.

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