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2011 ACM Conference on Bioinformatics, Computational Biology and Biomedicine, ACM-BCB 2011

作者： Xue, Li C. Walia, Rasna EL-Manzalawy, Yasser Dobbs, Drena Honavar, Vasant Bioinformatics and Computational Biology Program Iowa State University Ames IA 50011 United States Department of Genetics Development and Cell Biology Iowa State University Ames IA 50011 United States Department of Computer Science Iowa State University Ames IA 50011 United States Department of Systems and Computer Engineering Al-Azhar University Cairo Egypt

ISBN: (纸本)9781450307963

Protein-RNA interactions play important roles in cellular processes like protein synthesis, RNA processing, and gene expression regulation. Reliable identification of the interfaces involved in RNA-protein interactions is essential for comprehending the mechanisms and the functional implications of these interactions and provides a valuable guide for rational drug discovery and design. Because the determination of 3D structures of protein-RNA complexes has various technical limitations and is typically costly, reliable in silico interface prediction methods that require only the sequence information are urgently needed. We present HomPRIP, a homologous sequence based method for predicting protein-RNA interfaces, based on our conservation analysis of protein-RNA interfaces. We test Hom-PRIP on a benchmark dataset of 199 proteins and compare it with the state-of-the-art protein-RNA interface prediction methods. Our results show that HomPRIP can reliably identify protein-RNA interface residues in 71% of test proteins with at least one putative sequence homolog passing the similarity thresholds of HomPRIP. Moreover, to facilitate predictions for proteins with no identified homologs, we develop HomPRIP-NB, a method combining the HomPRIP predictor and a Naive Bayes (NB) classifier trained using evolutionary information derived from alignments against the NCBI nr database. Our results suggest that HomPRIP-NB significantly outperforms the state-of-the-art machine learning methods for predicting protein-RNA interface residues. Copyright © 2011 ACM.

关键词： Proteins

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When social networking meets the next generation network

When social networking meets the next generation network

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Asia-Pacific Network Operations and Management Symposium (APNOMS)

作者： R. Chen Meng-Hsun Tsai Tony Wrobel Jui-Ming Chen Sih-Han Wang Shu-Shan Ku Jen-Huei Jung Jeu-Yih Jeng IBM Taipei Taiwan Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan IBM USA Networked Communications Program Taipei Taiwan Department of Computer Science National Chiao Tung University Hsinchu Taiwan Telecommunication Laboratories Chunghwa Telecom Company Limited Taipei Taiwan

As mobile technologies evolved, the mobile networks provided users not only high mobility, but also high data rates and flexible services. Meanwhile, Internet services had been very successful from 1970s to date. However, the Internet and the mobile telecommunications evolved separately and were not compatible until 3GPP proposed the IP Multimedia Subsystem (IMS). In this paper, we first introduce mobile Web 2.0 application creation in the next generation IMS network. Then we propose a proof-of-concept service called “JoinMe” on the IBM-NCTU IMS network to study how a social networking service can be created for mobile networks.

关键词： Mobile communication Servers Mobile computing Next generation networking telecommunications Social network services Internet

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Organic Thin Film Transistor architecture, parameters and their applications

Organic Thin Film Transistor architecture, parameters and th...

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International Conference on Communication Systems and Network Technologies

作者： Mittal, Poornima Kumar, Brijesh Negi, Y.S. Kaushik, B.K. Singh, R.K. Electronics and Communication Engineering Graphic Era University-Dehradun Dehradun India Polymer Science and Technology Program DPT Indian Institute of Technology-Roorkee Roorkee India Department of Electronics and Computer Engineering Indian Institute of Technology-Roorkee Roorkee India Electronics and Communication Engineering Uttarakhand Technical University-Dehradun Dehradun India

ISBN: (纸本)9780769544373

Organic Thin Film Transistors (OTFTs) are promising devices for future development of variety of low-cost and large-area electronics applications such as flexible displays. This paper analyzes the performance of OTFT made of several organic semiconducting and insulating materials and further discusses their applications. Analysis of previous research work demonstrates that the mobility in OTFT decreases when the product of semiconducting film thickness and gate capacitance per unit area increases. The decrease is specified by a power law function with parameters for several organic semiconductors. OTFT characteristics have undergone spectacular improvements during the last few years. This paper explores the effect of variation of channel length from 40 nm to 20 nm on drain current for pentacene bottom contact structure. Variations in these quantities maps to variations in the electrical behaviour of devices. It has been found that drain current increases due to decrease in length of organic thin film conducting channel. It reviews recent progress in parameter properties for device designs and applications related to OTFTs. The performance of OTFTs is evaluated in terms of mobility, on/off current ratio, threshold voltage and sub threshold slope. This paper thoroughly discusses the overall performance and applications of OTFTs in various fields. © 2011 IEEE.

关键词： Drain current

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Squaraine donors for high efficiency small molecule solar cells

Squaraine donors for high efficiency small molecule solar ce...

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37th IEEE Photovoltaic Specialists Conference, PVSC 2011

作者： Wei, Guodan Wang, Siyi Xiao, Xin Renshaw, C. Kyle Hall, Lincoln Diev, Vyacheslav V. Thompson, Mark E. Forrest, Stephen R. Department of Materials Science and Engineering University of Michigan Ann Arbor MI United States Department of Chemistry University of Southern California Los Angeles CA United States Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI United States Applied Physics Program University of Michigan Ann Arbor MI United States Department of Physics University of Michigan Ann Arbor MI United States

ISBN: (纸本)9781424499656

It has been a challenge to achieve high efficiency organic photovoltaics (OPV) that absorb long wavelength solar radiation without incurring unacceptable reductions in open circuit voltage (Voc) or charge separation efficiency. Based on the parent structure of the 2, 4-bis[4-(N, N-diisobutylamino)-2,6-dihydroxyphenyl] squaraine (SQ), we have increased V oc using a family of highly near-infrared absorbing SQs, achieving values as high as 0.94 V. These SQ donors are: 2, 4-bis[4-(N-Phenyl-1- naphthylamino)-2,6-dihydroxyphenyl] squaraine (1-NPSQ),2,4-bis[4-(N, N-diphenylamino)-2,6 dihydroxyphenyl] squaraine (DPSQ), 2,4-bis[4-(N, N-diphenylamino)-2,6-dihydroxyphenyl] asymmetric squaraine (DPASQ). The spin-cast SQ, 1-NPSQ, DPSQ and DPASQ donors are then coated with the acceptor C60 to form bulk heterojunction (BHJ) solar cells that take advantage of their exceptionally high absorption coefficient and nanocrystalline morphology to overcome the short diffusion length characteristic of these materials. Combined with a high short-circuit current density (J sc=10.6 mA/cm2) and high fill factor (FF=0.64), the optimized 1-NPSQ/C60 photovoltaic cells with 1-NPSQ annealed at elevated temperature have a power conversion efficiency of ηp as high as 6.0% (correcting for solar mismatch) at 1 sun (AM 1.5G) simulated solar illumination, which to our knowledge is the highest efficiency reported to date for small molecule OPVs. © 2011 IEEE.

关键词： Solar cells

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The node degree for wireless ad hoc networks in shadow fading environments

The node degree for wireless ad hoc networks in shadow fadin...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Lifang Guo Huimin Xu Khaled Harfoush School of Telecommunication Engineering Beijing University of Posts and Telecommunications Beijing China Department of Computer Science North Carolina State University Raleigh NC USA

Node degree has been regarded as one of the important and convenient metrics to measure the connectivity of the wireless ad hoc networks. Many studies concerning node degree are based on the assumption of static connectivity graph on the number of nodes, which can not reflect the mobility characteristics in ad hoc networks. In this paper we investigate three fundamental characteristics of a wireless ad hoc network: its node degree distribution, its average node degree and its maximum node degree experienced by all the nodes during theirs movement. We employ a novel mathematical modeling to derive their analytical expressions in presence of radio channel fading. The results of this paper are useful in the study of connectivity and improving algorithm complexity of incentive protocols. Also, these results are of practical value for researchers in this area, e.g., if they set the parameters in a network-level simulation of a mobile ad hoc network or if they design a wireless sensor network.

关键词： Fading Mobile ad hoc networks Mathematical model Equations Random variables Approximation methods Conferences

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Empirical analysis of content-based music retrieval for music identification

Empirical analysis of content-based music retrieval for musi...

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International Conference on Multimedia Technology

作者： Ja-Hwung Su Cheng-Wei Wu Shao-Yu Fu Yu-Feng Lin Wei-Yi Chang I-Bin Liao Kuo-Wei Chang Vincent. S. Tseng Department of Computer Science and Information Engineering National Cheng Kung University Tainan Taiwan Telecommunication Laboratories Chunghwa Telecom Company Limited Taoyuan Taiwan

ISBN: (纸本)9781612847719

Over the past few years, digitized music in forms like MP3 has made a great impact on the way of acquiring and listening to music. Due to the advanced communication tools, the consumers may search and purchase their favorite music online without going to physical music stores. Consider that a user occasionally gets an unknown and preferred music episode, but she/he has no idea on how to identify the query terms to retrieve the music using traditional textual-based search engines. Thereupon content-based music retrieval for music identification serves as an adequate solution for the users to search the targeted music effectively and conveniently. In this paper, we present several methods and similarity functions designed to achieve the effective content-based music identification. In particular, we compare the performances of various similarity functions with different musical features under real environments. The experimental results on real music datasets reveal that the Hamming Distance can bring out very robust performance for content-based music identification in terms of accuracy. In addition to music identification, this paper with detailed empirical analysis also provides the researchers with insightful ideas in other real applications such as audio monitoring, musical copyright, etc.

关键词： Fingerprint recognition Music Hamming distance High definition video Music information retrieval Mel frequency cepstral coefficient Euclidean distance

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A transfer method for complex structures fabricated on non-planar surfaces

A transfer method for complex structures fabricated on non-p...

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International Solid-State Sensors, Actuators and Microsystems Conference

作者： Zeng, X. Huang, C.-C. Jiang, H. Department of Electrical and Computer Engineering University of Wisconsin Madison Madison WI United States Eye Research Institute University of Wisconsin - Madison Madison WI United States Materials Science Program University of Wisconsin - Madison Madison WI United States

ISBN: (纸本)9781457701573

A method to fabricate complex structures on non-planar surfaces by utilizing a transfer method is presented. 3-dimensional and high-aspect-ratio microelectromechanical systems (MEMS) structures are transferred to flexible membranes, and can be further transferred to any non-planar surfaces. Here, we used a structure formed on a silicon-on-insulator (SOI) wafer by deep reactive-ion etching (DRIE) as an example. Both photoresist SU8-2050 and AZ 4620 were used as the flexible membranes. The effect of the structure and density of pillars on the transferring procedure was studied. Potentially this method could be utilized to transfer any MEMS structures and devices to any non-planar surfaces, thus possessing great potential in MEMS devices. © 2011 IEEE.

关键词： Photoresists

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High Performance High Dielectric Constant Films Deposited by Dual Spectral Source Rapid Isothermal Assisted Metalorganic Chemical Vapor Deposition (MOCVD)

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MRS Online Proceedings Library (OPL) 2011年第1期470卷 133-133页

作者： Y. Chen R. Singh S. DeBoer R.P.S. Thakur Department of Electrical and Computer Engineering Clemson University Clemson SC 29634 Department of Electrical and Computer Engineering and Material Science and Engineering Program Clemson University Clemson SC 29634 singh@ces.clemson.edu Micron Technology Inc. Boise ID 83706

Dual spectral source assisted MOCVD is an ideal technique for the deposition of high dielectric constant materials as well as other electronic and optical materials. Tungsten halogen lamps and a deuterium lamp are used as the sources of optical and thermal energy. Ta2O5 films were deposited at 200°C for 30 minutes and annealed at 600°C for 30 minutes have shown leakage current densities as low as 10−10 A/ cm2 for gate voltage under 5V. To the best of our knowledge, these are the best results reported to date by other researchers. The high energy photons used in the in-situ cleaning and deposition process play an important role in obtaining high quality films of Ta2O5.

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On the maximum imbalance of binary sequences with low aperiodic autocorrelations

On the maximum imbalance of binary sequences with low aperio...

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5th International Workshop on Signal Design and Its Applications in Communications, IWSDA'11

作者： Trinh, Quang Khai Fan, Pingzhi Hao, Li Mow, Wai Ho Telecommunication Department Faculty of Electrical and Electronic Engineering University of Transport and Communications Lang Thuong Dong Da Hanoi Viet Nam Provincial Key Lab of Information Coding and Transmission Institute of Mobile Communications Southwest Jiaotong University Chengdu Sichuan 610031 China Department of Electronic and Computer Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong

ISBN: (纸本)9781612840468

Binary sequences with low aperiodic autocorrelation function sidelobes, such as Barker, quasi-Barker, and minimum peak sidelobe sequences have found extensive applications in radar and communications systems. However, there is no systematic method to construct such desirable binary sequences except the use of time consuming and costly exhaustive computer search. In this paper, an upper bound on the maximum imbalance of binary sequences with low aperiodic autocorrelation is derived and is expressed in terms of the sequence length, the window size and the peak sidelobe levels. It sheds some light on the tradeoff between the sequence parameters involved and may be useful in developing efficient sequence searches. © 2011 IEEE.

关键词： Binary sequences

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Capacitance Humidity Sensor

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MRS Online Proceedings Library 2011年第1期382卷 469-475页

作者： Andrew R. K. Ralston Paul E. Thoma Carl F. Klein Denice D. Denton Materials Science Program Department of Electrical and Computer Engineering and Department of Chemistry University of Wisconsin-Madison Madison USA Central Research Johnson Controls Inc. Milwaukee USA

A capacitance relative humidity (RH) sensor is described that has a design, construction, and material composition that result in an inexpensive and robust sensor. This sensor has a multilayer, free-standing film construction. It consists of a humidity sensitive polyimide (PI) dielectric core and conductive layers consisting of carbon filled polysulfone on each side of the polyirnide film to form a capacitor. The polyimide used is a BPDA-ODA type, and replaces a PMDA-ODA type polyimide used in a previous version of this sensor. The BPDA-ODA sensor has a nominal capacitance of 200 pF and a nominal sensitivity of 13% at 100% RH. The characteristics of this humidity sensor are discussed and compared to the characteristics of the PMDA-ODA type sensor. Characteristics considered include the PI film moisture uptake and water vapor transmission, and the sensors’ sensitivity to relative humidity, frequency response, and aging at 85°C/85% RH. The dual-state sorption model and free volume calculations are used to demonstrate that observed differences in the film are due to differences in chemical composition between the films.

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