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An Optical Fiber Sensor Probe Using a PMMA/CPR Coated Bent Optical Fiber as a Transducer for Monitoring Trace Ammonia  [PDF]
Yu Huang, Shiquan Tao
Journal of Sensor Technology (JST) , 2011, DOI: 10.4236/jst.2011.12005
Abstract: Ammonia sensors have broad spectrum of applications for industrial process control as well as for environ-mental monitoring. An optical fiber ammonia sensor probe has been developed by using a bent optical fiber having dual poly(methyl methacrylate) (PMMA)/chlorophenol red (CPR) coatings as a transducer. This sen-sor probe was tested for monitoring trace ammonia in gas samples using air as sample matrix. The reaction of ammonia with CPR causes a color change of the reagent, which was detected by using fiber optic evanes-cent wave absorption spectrometry as a sensing signal. By adopting a dual layer coating structure, the sensor probe has faster response compared to a sensor using a broadly accepted sensing reagent-immobilized poly-mer coating structure. The sensor developed in this work is sensitive, has a detection limit of 2.7 ppb NH3 in air, which is the most sensitive among the reported optical fiber ammonia sensors to the best knowledge of the authors. The sensor is also reversible and has a response time of 25 minutes. The features of high sensi-tivity, reversibility and reasonable response time make this sensor technique very attractive for air quality monitoring.
Dividend Payments and Related Problems in a Markov-Dependent Insurance Risk Model under Absolute Ruin  [PDF]
Wenguang Yu, Yujuan Huang
American Journal of Industrial and Business Management (AJIBM) , 2011, DOI: 10.4236/ajibm.2011.11001
Abstract: In this paper, we study the dividend payments prior to absolute ruin in a Markov-dependent risk process in which the claim occurrence and the claim amount are regulated by an external discrete time Markov chain. A system of integro-differential equations with boundary conditions satisfied by the moment-generating function, the nth moment of the discounted dividend payments prior to absolute ruin and the discounted penalty function, given the initial environment state, are derived. In the two-state risk model, explicit solutions to the integro-differential equations satisfied by the nth moment of the discounted dividend payments prior to absolute ruin are obtained when the claim size distribution is exponentially distributed. Finally, the matrix form of systems of integro-differential equations satisfied by the discounted penalty function are presented.
The Markovian Regime-Switching Risk Model with Constant Dividend Barrier under Absolute Ruin  [PDF]
Wenguang Yu, Yujuan Huang
Journal of Mathematical Finance (JMF) , 2011, DOI: 10.4236/jmf.2011.13011
Abstract: In this paper, we consider the dividend payments prior to absolute ruin in a Markovian regime-switching risk process in which the rate for the Poisson claim arrivals and the distribution of the claim amounts are driven by an underlying Markov jump process. A system of integro-differential equations with boundary conditions satisfied by the moment-generating function, the n th moment of the discounted dividend payments prior to absolute ruin and the expected discounted penalty function, given the initial environment state, are derived. Then, the matrix form of systems of integro-differential equations satisfied by the discounted penalty function are presented. Finally, we obtain the integro-differential equations satisfied by the time to reach the dividend barrier.
Parameter Optimization of Multi-Agent Formations based on LQR Design
Huang Huang,Changbin Yu
Computer Science , 2011,
Abstract: In this paper we study the optimal formation control of multiple agents whose interaction parameters are adjusted upon a cost function consisting of both the control energy and the geometrical performance. By optimizing the interaction parameters and by the linear quadratic regulation(LQR) controllers, the upper bound of the cost function is minimized. For systems with homogeneous agents interconnected over sparse graphs, distributed controllers are proposed that inherit the same underlying graph as the one among agents. For the more general case, a relaxed optimization problem is considered so as to eliminate the nonlinear constraints. Using the subgradient method, interaction parameters among agents are optimized under the constraint of a sparse graph, and the optimum of the cost function is a better result than the one when agents interacted only through the control channel. Numerical examples are provided to validate the effectiveness of the method and to illustrate the geometrical performance of the system.
Triple and Double Photons Absorption Process and Down-Conversion Laser Emitting Investigation of Er-Ion Doped Microsphere  [PDF]
Yantang Huang, Peijing Zhang, Yu Huang, Changlei Guo
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.412201
Abstract:

We report a readily and cheap method to build taper optical fiber-Er3+ doped microsphere platform to investigate upconversion fluorescence emission and down-conversion laser oscillation with low threshold pump power. We demonstrate to dope Er3+ into silica microsphere surface by dipping a single-taper optical fiber into a certain concentration of erbium nitrate solution (Er(NO3)) , then dry it and use the electrical-arc of the optical fiber splicer to melt the tip of taper fiber to form the Er3+-doped silica microsphere due to surface tension induced. We also present a HF acid etching setup to fabricate low loss biconical optical taper fibers. We demonstrate the Er3+ doped silica microsphere triple photons and dual photons absorption process of up-conversion fluorescence emission and down-conversion laser oscillation spectra by using the optical tapered fiber to couple 976 nm/1534 nm pump light source.

The Restraining Factors for the Academic Development of Female Academics and the Countermeasures in China  [PDF]
Ping Huang, Guangrong Yu, Chuandong Ma
Open Journal of Social Sciences (JSS) , 2014, DOI: 10.4236/jss.2014.26055
Abstract: Female academics are an integral part in colleges and universities, playing a more and more important role in the development of higher education in China. Female academics are the part of main working force that cannot be neglected in higher education, especially in knowledge-based economy. This paper will commence to present the facts and situation of female academics’ achievement by some statistical data. Then, the significance of the female academics professional development will be discussed. The causes that restrain the female academics’ professional development will be analyzed in China. Some suggestions and countermeasures for their academic research development will be discussed.
The Comparison of Three Major Occupations for User Acceptance of Information Technology: Applying the UTAUT Model  [PDF]
Yu Shan Cheng, Tsai Fang Yu, Chin Feng Huang, Chien Yu, Chin Cheh Yu
iBusiness (IB) , 2011, DOI: 10.4236/ib.2011.32021
Abstract: This study investigated whether the differences of gender, age, and occupation for m-learning showed significance on the utilization of the mobile devices and to figure out if the variation may influence the performance expectancy, effort expectancy and the social influence to the behavioral intention or even to the behavior of usage. When the employees’ behavioral intention was low, the director of managers or HR department can suggest the employees’ colleagues, superior manager or friends to communicate with them to enhance their behavioral intention and to use it. And it suggested that male employees and elder employees should be put more emphasis on the communication to enhance their behavioral intention. UTAUT model with different kinds of businesses for m-learning but the conclusion did not investigate the differences of the adoption of the mobile devices in each industry. Basing on this, this study attempted to investigate whether the difference occupations showed significance on the utilization of the mobile devices.
Improving the Timing of Extended Finite State Machines Via Catalyst
Shi-Yu Huang
VLSI Design , 2002, DOI: 10.1080/1065514021000012246
Abstract: We propose a timing optimization technique for a complex finite state machine that consists of not only random logic but also data operators. In such a design, the timing critical path often forms a cycle and thus cannot be cut down easily by popular techniques such as pipelining or retiming. The proposed technique, based on the concept of catalyst, adds a functionally redundant block—which includes a piece of combinational logic and several other registers—to the circuits under consideration so that the timing critical paths are divided into stages. During this transformation, the circuit's functionality is not affected, while the speed is improved significantly. This technique has been successfully applied to an industrial application—a Built-In Self-Test (BIST) circuit for static random access memories (SRAMs). The synthesis result indicates a 47% clock cycle time reduction.
A necessary and sufficient condition on robust SPR stabilizability for low degree systems
Wensheng Yu,Lin Huang
Chinese Science Bulletin , 1999, DOI: 10.1007/BF02885538
Abstract: For low degree systems (n 3), it is verified that all convex combination ofa (s) andb (s) keeping Hurwitzness is a necessary and sufficient condition for the existence ofc (s) such that bothc(s)/a(s) andc(s)/b(s) are SPR.
A Research on Influential Factors Related to the Stability of Competition-Oriented Strategic Alliances
Hong Ji,Yu Huang
International Journal of Business and Management , 2010, DOI: 10.5539/ijbm.v5n11p148
Abstract: The characteristics of enterprises’ strategic alliances definitely lead to their complexity and instability while relative stability serves as a premise and necessity for success. Starting from strategic alliances, this paper studies competition-oriented strategic alliance, a special alliance involving both competition and cooperation. Profound analysis is conducted inside and outside such an alliance on influential factors related to its stability.
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