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Nuclear cardiology image enhancement using wavelet transform analysis

Physica Medica 2014年 30卷 e30-e30页

作者： A. Poulakis S. Angelakis G. Fountos G.S. Panagiotakis I. Asteriadis I. Valais Department of Biomedical Engineering Technological Educational Institute of Athens 12210 Athens Greece Biomedical Informatics and Technology Graduate Program School of Computer Science University of Crete Department of Medical Physics Medical School University of Patras 265 00 Patras Greece Department of Nuclear Medicine General Hospital of Kavala 65 500 Kavala Greece

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Performance analysis of VoIP client with integrated encryption module

Performance analysis of VoIP client with integrated encrypti...

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International Conference on Communications, Signal Processing, and their Applications (ICCSPA)

作者： Abdi Wahab Rizal Broer Bahaweres Mudrik Alaydrus Muhaemin Riyanarto Sarno Graduate Program of Electrical Engineering Department Mercu Buana University Jakarta Indonesia Department of Information Systems STMIK Indonesia Jakarta Indonesia Department of Informatics Engineering Faculty of Information Tech ITS Surabaya Indonesia

The number of VoIP users in Indonesia is very low, although the cost offered by VoIP is smaller than using pulsed phone. One of the reason is security provided by the VoIP service provider is still lacking. VoIP users have not received yet the security service to ensure the security of communications. This study tries to secure communications between VoIP users using encryption module that is integrated with VoIP client Sipdroid running on Android Smartphone. It is possible for VoIP users because VoIP client that can only be accessed by VoIP users. The result obtained after integration with encryption module using three encryption schemes, they are AES, DES, and RC4. Sipdroid able to resist passive attack from tapping information (eavesdropping) during the communication session. And the result of QoS measurements is an increase delay of 0.01 ms and no significant change in the throughput and the packet loss, for throughput generated about 78 kbps, and for the average packet loss is 0.8%. However there is a noise that follows the communication on Sipdroid integrated with the encryption module due to the wave skew from the increase time during the encryption process.

关键词： Encryption Delays Throughput Packet loss Androids

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Study of decision variables for enterprises information security investment

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Journal of Quality 2013年第4期20卷 379-401页

作者： Chanu, Chien-lung Tseng, Shu-Fen Lu, Chih-hung Department of Information Management Yuan Ze University Taiwan Graduate Program of Social Informatics Yuan Ze University Taiwan

The increased in information security issues have caused great amount losses to enterprises and have damaged the reputation of those enterprises. In coping with a variety of information security issues, enterprises are always in a dilemma when they need to make investment decisions for information security infrastructure. Managers need to achieve both goals of risk control and cost effectiveness. The aim of this research is to examine the variables influencing enterprises' information security investment decisions. We collected data from decision makers involved in information technology investment through interviews and questionnaires. Factors affecting enterprises information security investment were classified into internal and external factors such as information security manpower, software, hardware, management, outsourcing, and services. Using regression analysis, variables influencing information security investments were found. External environmental factors have no significant effect on enterprises information security investment. Variables that can predict "information security investment" by the order of beta coefficients are: "the senior executives' attitude toward control of information security," "information security risk index," "the scale of enterprise," and "the degree of enterprises' technology application." Consequently, enterprises need to empower the top management to control information security and risk perception to improve the quality of information security decision making. Decision analysis framework is recommended to tradeoff the information security risk control and cost effectiveness of information security investment.

关键词： Security of data

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A Data Management in a Private Cloud Storage Environment Utilizing High Performance Distributed File Systems

A Data Management in a Private Cloud Storage Environment Uti...

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IEEE International Workshops on Enabling Technologies: Infrastructure for Collaborative Enterprises

作者： Tiago S. Soares M. A. R. Dantas Douglas D. J. de Macedo Michael A. Bauer Informatics and Statistic Department (INE) Federal University of Santa Catarina (UFSC) Post-Graduate Program of Knowledge Engineering and Management Federal University of Santa Catarina (UFSC) Computer Science Department (CSD) University of Western Ontario (UWO)

ISBN: (纸本)9781479904051

The new trend in the process of data-intensive management indicates the importance of a distributed file system for both Internet large scale services and cloud computing environments. I/O latency and application buffering sizes are two of a number of issues that are essential to be analysed on different class of distributed file systems. In this paper, it is presented a research work comparing four different high performance distributed file systems. Those systems were employed to support a medical image server application in a private storage environment. Experimental results highlight the importance of an appropriate distributed file system to provide a differential level of performance considering application specific characteristics.

关键词： Distributed File System DICOM HDF5 Telemedicine

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A Security Model for Distributed Collaborative Environments in the Healthcare

A Security Model for Distributed Collaborative Environments ...

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International Conference on Computational Science and its Applications (ICCSA)

作者： Rafael Viana Lopes Araújo Francisco J.S. e Silva Graduate Program in Electrical Engineering Federal University of Maranhão (UFMA) São Luís MA Brazil Department of Informatics of the Federal University of Maranhão (UFMA) São Luís MA Brazil

Distributed Collaborative Environments provide a common user interface that enables collaborative tasks of geographically dispersed users in a specific context. In such environments, many features can be provided, such as asynchronous and synchronous communication mechanisms, a repository for shared resources, and concurrent (synchronous) edition of content. However, it is clear that there is still a shortage concerning the security support in such environments. This becomes even more severe when the context in which these environments are inserted deals with sensitive data, such as patient data and their medical records. The present work proposes a security model for distributed collaborative environments focusing the support for medical researches.

关键词： Collaboration Context Distributed databases Educational institutions Authentication

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Securing elliptic curve based El-Gamal against Pollard Rho attack using elliptic curve based Diffie-Hellman key exchange

Securing elliptic curve based El-Gamal against Pollard Rho a...

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7th International Conference for Internet Technology and Secured Transactions, ICITST 2012

作者： Zani, Tafta Barmawi, Ari Moesriami Abdurohman, Maman Informatics Study Program Graduate School of Telkom Institute of Technology Bandung Indonesia

ISBN: (纸本)9781908320087

Elliptic Curve based El-Gamal (ECEG) cryptosystem is one of many widely used public key cryptosystems that makes use the elliptic curve discrete logarithm problem (ECDLP). For breaking ECDLP, Pollard Rho is currently the fastest attack. In this study a hybrid of Elliptic Curve based Diffie-Hellman Key Exchange (ECDHKE) and ECEG, is modified as an attempt to make harder for an attacker to reveal ECEG's private key by executing Pollard Rho attack using information from the public key gained by eavesdropping. This study examine the modified ECEG strength increase and the feasibility for implementing the modified ECEG. © 2012 Infonomics Society.

关键词： Geometry

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Code Compression using Multi-Level Dictionary

Code Compression using Multi-Level Dictionary

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IEEE Latin American Symposium on Circuits and Systems

作者： Wanderson Roger Azevedo Dias Edward David Moreno Federal University of Amazonas - UFAM Institute of Computing - IComp Post-Graduate Program in Informatics - PPGI Manaus Amazonas Brazil Federal University of Sergipe - UFS Center for Exact Sciences and Technology - CCET Department of Computing - DComp Aracaju Sergipe Brazil

ISBN: (纸本)9781467348973

This paper presents a new code compression method in which we merge the Huffman algorithm with the formation of patterns of blocks and three dictionaries. We seek two consecutive blocks in two levels, one of them into compressed code and the other related to uncompressed code. We have used simulation with SimpleScalar and programs from MiBench. Our proposal has achieved a compression rate of 32.6% and 31.9%, respectively, for ARM and MIPS processor.

关键词： ARM MIPS Multi-Level Dictionary

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Proceedings from the 9th annual conference on the science of dissemination and implementation: Washington, DC, USA. 14-15 December 2016

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Implement Sci 2017年第SUPPL 1期12卷 48-48页

作者： David Chambers Lisa Simpson Gila Neta Ulrica von Thiele Schwarz Antoinette Percy-Laurry Gregory A. Aarons Ross Brownson Amanda Vogel Shannon Wiltsey Stirman Kenneth Sherr Rachel Sturke Wynne E. Norton Allyson Varley Cynthia Vinson Lisa Klesges Suzanne Heurtin-Roberts M. Rashad Massoud Leighann Kimble Arne Beck Claire Neely Jennifer Boggs Carmel Nichols Wen Wan Erin Staab Neda Laiteerapong Nathalie Moise Ravi Shah Susan Essock Margaret Handley Amy Jones Jay Carruthers Karina Davidson Lauren Peccoralo Lloyd Sederer Todd Molfenter Ashley Scudder Sarah Taber-Thomas Kristen Schaffner Amy Herschell Eva Woodward Jeffery Pitcock Mona Ritchie JoAnn Kirchner Julia E. Moore Sobia Khan Shusmita Rashid Jamie Park Melissa Courvoisier Sharon Straus Daniel Blonigen Allison Rodriguez Luisa Manfredi Andrea Nevedal Joel Rosenthal David Smelson Christine Timko Nicole Stadnick Jennifer Regan Miya Barnett Anna Lau Lauren Brookman-Frazee Erick Guerrero Karissa Fenwick Yinfei Kong Gregory Aarons Rebecca Lengnick-Hall Benjamin Henwood Nina Sayer Craig Rosen Robert Orazem Brandy Smith Lindsey Zimmerman David Lounsbury Rachel Kimerling Jodie A. Trafton Steven Lindley Rahul Bhargava Hal Roberts Laura Gibson Gabriel J. Escobar Vincent Liu Benjamin Turk Arona Ragins Patricia Kipnis Ashley Ketterer Gruszkowski Michael W. Kennedy Emily Rentschler Drobek Lior Turgeman Aleksandra Sasha Milicevic Terrence L. Hubert Larissa Myaskovsky Youxu C. Tjader Robert J. Monte Kathryn G. Sapnas Edmond Ramly Diane R Lauver Christie M Bartels Shereef Elnahal Andrea Ippolito Hillary Peabody Carolyn Clancy Randall Cebul Thomas Love Douglas Einstadter Shari Bolen Brook Watts Vera Yakovchenko Angela Park William Lukesh Donald R. Miller David Thornton Mari-Lynn Drainoni Allen L. Gifford Shawna Smith Julia Kyle Mark S Bauer Daniel Eisenberg Celeste Liebrecht Michelle Barbaresso Amy Kilbourne Elyse Park Giselle Perez Jamie Ostroff Sarah Greene Michael Parchman Brian Austin Eric Larson Stefanie Ferreri Chris Shea Megan Smith Kea Turner Jennifer Bacci Kyle Bigham Geoffr Division of Cancer Control and Population Sciences National Cancer Institute Rockville MD 20850 USA AcademyHealth Washington DC 20009 USA Department of Learning Informatics Management and Ethics Karolinska Institutet Stockholm 17177 Sweden Department of Psychiatry University of California San Diego San Diego CA 92093 USA George Warren Brown School of Social Work Washington University in St. Louis St. Louis MO 63130 USA Center for Global Health National Cancer Institute Rockville MD 20850 USA Dissemination and Training Division VA National Center for PTSD Palo Alto CA 94305 USA Department of Global Health University of Washington Seattle WA 98105 USA Center for Global Health Studies Fogarty International Center National Institutes of Health Bethesda MD 20912 USA School of Public Health University of Alabama at Birmingham Birmingham AL 35243 USA School of Public Health University of Memphis Memphis TN 38152 USA USAID Applying Science to Strengthen and Improve Systems (ASSIST) Project Bethesda Maryland 20814 USA Institute for Health Research Kaiser Permanente Denver CO 80231 USA ICSI Institute for Clinical Systems Improvement Bloomington MN 55425 USA Medicine University of Chicago Chicago IL 60637 USA Medicine Columbia University Medical Center New York NY 10032 USA Psychiatry Columbia University New York NY 10032 USA General Internal Medicine Epidemiology and Biostatistics University of California San Francisco San Francisco CA 94110 USA New York State Office of Mental Health New York NY 10001 USA Medicine Icahn School of Medicine at Mount Sinai New York NY 10029 USA Center for Health Enhancement System Studies University of Wisconsin Madison WI 53706 USA Department of Psychiatry University of Pittsburgh Pittsburgh PA 15213 USA Psychology University at Buffalo Buffalo NY 14260 USA Department of Psychology West Virginia University Morgantown WV 26506 USA MIRECC VA North Little Rock AR 72114 USA QUERI for Team-Based Behavioral Health Centr

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Bayesian-based model selection and physical parameter estimation of the acoustical properties of rigid-frame porous media

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The Journal of the Acoustical Society of America 2014年第4_SUPPLEMENT期135卷 2408-2408页

作者： Cameron J. Fackler Ning Xiang Kirill V. Horoshenkov Amir Khan Graduate Program in Architectural Acoust. Rensselaer Polytechnic Inst. 110 8th St Greene Bldg. Troy NY 12180 facklc@rpi.edu Dept. of Mech. Eng. Univ. of Sheffield Sheffield United Kingdom School of Eng. and Informatics Univ. of Bradford Bradford United Kingdom

This paper studies an application of Bayesian inference to determine the most appropriate model for the acoustical properties of rigid-frame porous media. The Bayesian framework encompasses two levels of inference: model selection and parameter estimation. Both are based on the posterior probability distribution, which is unique to each combination of acoustic model and material sample. The posterior distribution provides statistically informed guidance on selecting an appropriate acoustic model for a material sample as well as determining the physical parameters of the porous microstructure. Using the nested sampling algorithm, the posterior distribution for each material sample and acoustic model is explored and integrated numerically. This process computes the Bayesian evidence for each model, which is used to select a suitable model for the acoustical properties of the material. The process also provides estimates of the physical parameters, which are used with the selected model for accurate prediction of the acoustical properties of the material.

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Frictional characteristics measurement of a ceramic aerostatic linear bearing 5

Frictional characteristics measurement of a ceramic aerostat...

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5th International Conference on Advanced Micro-Device Engineering, AMDE 2013

作者： Kitabata, Kouki Iwashita, Hiroshi Takita, Akihiro Djamal, Mitra Pornsuwancharoen, Nithiroth Fujii, Yusaku Education Program of Electronics and Informatics Mathematics and Physics Graduate School of Science and Technology Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Depatment of Electronics Graduate School of Engineering Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Division of Mechanical Sience and Technology Graduate School of Tecnology Gunma University 1-5-1 Tenjin-cho Kiryu Gunma376-8515 Japan Theoretical High Energy Physics and Instrumentation Research Group Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jl. Ganesa 10 Bandung40132 Indonesia Department of Electrical Engineering Faculty of Industry and Technology Rajamangala University of Technology Isan Sakonnakon47160 Thailand

ISBN: (纸本)9783038354659

The resultant force acting on the moving part of the ceramic aerostatic linear bearing is measured highly accurately as the inertial force of the moving part of the bearing by means of the levitation mass method (LMM). The measurement results of the ceramic aerostatic linear bearing and metal aerostatic linear bearing of different mass are compared. The regression equation of the ceramic aerostatic linear bearing and metal aerostatic linear bearing are calculated. The ceramic linear bearing and metal linear bearing have extremely small frictional force.. © (2015) Trans Tech Publications, Switzerland.

关键词： Aerodynamics

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