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Search Results: 1 - 10 of 202032 matches for " Yang B "
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Effect of a rotating frame on preventing bead aggregation in a microfluidic device  [PDF]
Jie Yang, Peter B. Howell, Nastaran Hashemi
Advances in Bioscience and Biotechnology (ABB) , 2012, DOI: 10.4236/abb.2012.35078
Abstract: Varying bead concentrations over the course of experiments have been reported by many scientists. A new device was designed and fabricated to eliminate bead aggregation in a syringe pump prior to flowing through a microchannel. We have molded the effects of rotation in the absence of longitudinal flow by evenly populating the cross section of a syringe with particles, then tracking their movement due to rotation, gravity, and centripetal forces. We have shown both experimentally and numerically that the concentration of the beads remains constant over the course of experiments once the rotational device is used. However, the concentration of the beads drops significantly once no rotation is applied during the experiment.
Data mining of hospital characteristics in online publication of medical quality information  [PDF]
Victor B. Kreng, Shao-Wei Yang
Health (Health) , 2013, DOI: 10.4236/health.2013.55123

Information disclosure can reduce information asymmetry between health care providers and patients, thus improving both patient safety and medical quality. The National Bureau of Health Insurance (NBHI) inTaiwancurrently publishes health-related information online in order to enhance service efficiency and enable the public to monitor the country’s medical system. A data mining technique, classification and regression tree (CART), is used in this work to investigate online public quality information to compare the characteristics of hospital. The hospital quality indicators and characteristics data are available on the websites of the NBHI
(http://www.nhi.gov.tw/AmountInfoWeb/Index.aspx) and the Department of Health
(http://www.doh.gov.tw/). The full classification and regression tree presented in this work, grown using the hospitals’ quality medical indicators and characteristic values, classifies all hospitals into seven groups. The rate of stays longer than 30 days, which is the dependent variable in this study, is most influenced by the number of medical staff. This reflects the fact that the fewer medical staffs that are employed, the smaller the hospital is, and patients who are likely to have longer stays tend to go to the medium or large hospitals. Policy makers should work to decrease or eliminate persistent healthcare disparities among different socioeconomic groups and offer more online healthrelated services to reduce information asymmetry between health care providers and patients.

A Multi-Criteria Decision Support System for the Selection of Low-Cost Green Building Materials and Components  [PDF]
Junli Yang, Ibuchim Cyril B. Ogunkah
Journal of Building Construction and Planning Research (JBCPR) , 2013, DOI: 10.4236/jbcpr.2013.14013
Abstract: The necessity of having an effective computer-aided decision support system in the housing construction industry is rapidly growing alongside the demand for green buildings and green building products. Identifying and defining financially viable low-cost green building materials and components, just like selecting them, is a crucial exercise in subjectivity. With so many variables to consider, the task of evaluating such products can be complex and discouraging. Moreover, the existing mode for selecting and managing, often very large information associated with their impacts constrains decision-makers to perform a trade-off analysis that does not necessarily guarantee the most environmentally preferable material. This paper introduces the development of a multi-criteria decision support system (DSS) aimed at improving the understanding of the principles of best practices associated with the impacts of low-cost green building materials and components. The DSS presented in this paper is to provide designers with useful and explicit information that will aid informed decision-making in their choice of materials for low-cost green residential housing projects. The prototype MSDSS is developed using macro-in-excel, which is a fairly recent database management technique used for integrating data from multiple, often very large databases and other information sources. This model consists of a database to store different types of low-cost green materials with their corresponding attributes and performance characteristics. The DSS design is illustrated with particular emphasis on the development of the material selection data schema, and application of the Analytical Hierarchy Process (AHP) concept to a material selection problem. Details of the MSDSS model are also discussed including workflow of the data evaluation process. The prototype model has been developed with inputs elicited from domain experts and extensive literature review, and refined with feedback obtained from selected expert builder and developer companies. This paper further demonstrates the application of the prototype MSDSS for selecting the most appropriate low-cost green building material from among a list of several available options, and finally concludes the study with the associated potential benefits of the model to research and practice.
Throughput of Rateless Codes over Broadcast Erasure Channels
Yang Yang,Ness B. Shroff
Mathematics , 2012,
Abstract: In this paper, we characterize the throughput of a broadcast network with n receivers using rateless codes with block size K. We assume that the underlying channel is a Markov modulated erasure channel that is i.i.d. across users, but can be correlated in time. We characterize the system throughput asymptotically in n. Specifically, we explicitly show how the throughput behaves for different values of the coding block size K as a function of n, as n approaches infinity. For finite values of K and n, under the more restrictive assumption of Gilbert-Elliott channels, we are able to provide a lower bound on the maximum achievable throughput. Using simulations we show the tightness of the bound with respect to system parameters n and K, and find that its performance is significantly better than the previously known lower bounds.
Experimental Study on Formation Characteristics and Laws of Dislocation and Stacking Fault during Cutting of Titanium Alloy
Y. Yang,B. Llu
Advances in Materials Science and Engineering , 2013, DOI: 10.1155/2013/306728
Abstract: Formation characteristics and laws of dislocation and stacking fault during cutting of titanium alloy were investigated by TEM. Several crucial aspects of experiment, such as sample cutting, mechanical reduction of thickness, dimpling, and ion reduction of thickness, were carefully designed and implemented. Further, electron diffraction pattern, diffraction contrast image, and high resolution electron photomicrograph of phase and phase were observed and analyzed. Following those analyses, the formation characteristics and laws of dislocation and stacking fault were made clear. Research results show that the edge dislocations exist commonly in the diffraction contrast images and high resolution electron photomicrographs of phase and phase. The stacking fault energy is higher in phase than in phase. In addition, the extended dislocation is difficult to be seen in phase, but it is easier to be produced in phase. 1. Introduction Titanium alloys, specifically Ti6Al4V, are used widely in aerospace industry, which offer favorable mechanical characteristics such as high strength-to-weight ratio, toughness, superb corrosion resistance, and biocompatibility [1, 2]. But titanium alloys are also difficult to machine materials with considerable manufacturing problems [3]. The distortion of titanium alloy thin-walled part due to CNC machining is one of the most striking process problems that exist in the manufacturing process of aerospace parts [4–8], which greatly impacts the production quality and efficiency and also leads to great economic losses. Previous researches have shown that when metal crystal is under force, the dislocation (line defect) inside of the metal crystal massively proliferates and causes a lot of crystallographic plane (slip plane) movement, which results in plastic deformation of material [9, 10]. Considering the fact that the machining distortion of titanium alloy thin-walled part is a kind of significant plastic deformation mechanical behavior, the machining distortion is closely related to the geometry form and movement of dislocation. Cutting of titanium alloy is a process with exceeding nonlinear and heat-stress coupled [11]. Within the material, some atoms deviate from their ideal locations under the influence of heat and stress, resulting in the crystal defects, and as a consequence, the various material properties are inevitably influenced. Further researches show that the perfect dislocations decompose under the action of thermal stress and extend a piece of stacking fault (planar defect) between two partial dislocations [12]. This
The origin of power-law distributions in self-organized criticality
C. B. Yang
Physics , 2004, DOI: 10.1088/0305-4470/37/42/L05
Abstract: The origin of power-law distributions in self-organized criticality is investigated by treating the variation of the number of active sites in the system as a stochastic process. An avalanche is then regarded as a first-return random walk process in a one-dimensional lattice. Power law distributions of the lifetime and spatial size are found when the random walk is unbiased with equal probability to move in opposite directions. This shows that power-law distributions in self-organized criticality may be caused by the balance of competitive interactions. At the mean time, the mean spatial size for avalanches with the same lifetime is found to increase in a power law with the lifetime.
Exact solution of rectangular Ising lattice in a uniform external field
C. B. Yang
Physics , 2013,
Abstract: A method is proposed for exactly calculating the partition function of a rectangular Ising lattice with the presence of a uniform external field. This approach is based on the method of the transfer matrix developed about seventy years ago for the rectangular Ising model in the absence of external field. The basis for the vector space is chosen as the eigenvectors of the diagonal part of the transfer matrix. The matrix elements for the non-diagonal part can be calculated very easily. Then the partition function and thermodynamical quantities can be evaluated. The limit of infinite lattice is discussed.
Finite hadronization time and unitarity in quark recombination model
C. B. Yang
Physics , 2005, DOI: 10.1088/0954-3899/32/2/L01
Abstract: The effect of finite hadronization time is considered in the recombination model, and it is shown that the hadron multiplicity turns out to be proportional to the initial quark density and unitarity is conserved in the model. The baryon to meson ratio increases rapidly with the initial quark density due to competition among different channels.
Bidding process in online auctions and winning strategy:rate equation approach
I. Yang,B. Kahng
Physics , 2005, DOI: 10.1103/PhysRevE.73.067101
Abstract: Online auctions have expanded rapidly over the last decade and have become a fascinating new type of business or commercial transaction in this digital era. Here we introduce a master equation for the bidding process that takes place in online auctions. We find that the number of distinct bidders who bid $k$ times, called the $k$-frequent bidder, up to the $t$-th bidding progresses as $n_k(t)\sim tk^{-2.4}$. The successfully transmitted bidding rate by the $k$-frequent bidder is obtained as $q_k(t) \sim k^{-1.4}$, independent of $t$ for large $t$. This theoretical prediction is in agreement with empirical data. These results imply that bidding at the last moment is a rational and effective strategy to win in an eBay auction.
RETRACTED: Heterojunction Photoelectrode of Polyaniline/ZnS Film/ZnO Nanorod on FTO Glass  [PDF]
Hyun Kim, B. Yang
Materials Sciences and Applications (MSA) , 2019, DOI: 10.4236/msa.2019.104027
Abstract: Short Retraction Notice
This article has been retracted to straighten the academic record. In making this decision the Editorial Board follows COPE's Retraction Guidelines. The aim is to promote the circulation of scientific research by offering an ideal research publication platform with due consideration of internationally accepted standards on publication ethics. The Editorial Board would like to extend its sincere apologies for any inconvenience this retraction may have caused.
Editor guiding this retraction: Martina Ma (Managing Editor of MSA)
The full retraction notice in PDF is preceding the original paper, which is marked \"RETRACTED\".
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