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2011 IEEE Nanotechnology Materials and Devices Conference, NMDC 2011

作者： Rahmawan, Yudi Lee, Kwang-Ryeol Moon, Myoung-Woon Suh, Kahp-Yang WCU Program for Multiscale Mechanical Design School of Mechanical and Aerospace Engineering Seoul National University Seoul 151-742 Korea Republic of Interdisciplinary Fusion Technology Division Korea Institute of Science and Technology Seoul 130-650 Korea Republic of

ISBN: (纸本)9781457721397

Fabrication of dual-scale roughness in a large area of biocompatible superhydrophobic surfaces was presented in this paper. Three dimensional (3-D) dual-scale roughness was achieved using a combination of top-down process by replica molding to make an ordered micro-pillars on poly-(dimethylsiloxane) (PDMS) as the soft base material and bottom-up process by deposition of diamond like amorphous carbon (DLC) as a hard-coating using radio frequency-chemical vapor desposition (RF-CVD) to produce nanoscale wrinkle structures. The extreme superhydrophobicity of the as-prepared surfaces was used as the culturing template of calf pulmonary artery endothelial (CPAE) cells for 3 days. We discovered that CPAE cells will be more adhered on surfaces with only microstructure compared to hierarchical structures. In particular, the reduced filopodia extension during cell growth was caused by disconnected focal adhesions on the pillar pattern. This limited cell adhesion could prevent undesired growth and proliferation of biological species on the surface of biomedical devices such as stents, implants or even injection syringes. © 2011 IEEE.

关键词： Biocompatibility

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On the Finite-SNR Diversity-Multiplexing Tradeoff of Zero-Forcing Transmit Scheme under Secrecy Constraint

On the Finite-SNR Diversity-Multiplexing Tradeoff of Zero-Fo...

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IEEE International Conference on Communications Workshops, ICC

作者： Zouheir Rezki Mohamed-Slim Alouini Electrical Engineering Program Physical Science and Engineering (PSE) Division King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia

In this paper, we address the finite Signal-to-Noise Ratio (SNR) Diversity-Multiplexing Tradeoff (DMT) of the Multiple Input Multiple Output (MIMO) wiretap channel, where a Zero-Forcing (ZF) transmit scheme, that intends to send the secret information in the orthogonal space of the eavesdropper channel, is used. First, we introduce the secret multiplexing gain at finite-SNR that generalizes the definition at high-SNR. Then, we provide upper and lower bounds on the outage probability under secrecy constraint, from which secret diversity gain estimates of ZF are derived. Through asymptotic analysis, we show that the upper bound underestimates the secret diversity gain, whereas the lower bound is tight with respect to secure DMT at high-SNR.

关键词： Diversity methods Signal to noise ratio Multiplexing Upper bound MIMO Gain Helium

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On the Average Capacity and Bit Error Probability of Wireless Communication Systems

On the Average Capacity and Bit Error Probability of Wireles...

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2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

作者： Ferkan Yilmaz Mohamed-Slim Alouini Electrical Engineering Program Division of Physical Sciences and Engineering King Abdullah University for Science and Technology Thuwal Makkah Saudi Arabia

Analysis of the average binary error probabilities and average capacity of wireless communications systems over generalized fading channels have been considered separately in the past. This paper introduces a novel moment generating function-based unified expression for both average binary error probabilities and average capacity of single and multiple link communication with maximal ratio combining. It is a matter to note that the generic unified expression offered in this paper can be easily calculated and that is applicable to a wide variety of fading scenarios, and the mathematical formalism is illustrated with the generalized Gamma fading distribution in order to validate the correctness of our newly derived results.

关键词： Fading Signal to noise ratio Error probability Wireless communication Receivers Capacity planning Modulation

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Partial relay selection based on shadowing side information over generalized composite fading channels

Partial relay selection based on shadowing side information ...

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International Symposium on Wireless Communication Systems (ISWCS)

In this paper, in contrast to the relay selection protocols available in the literature, we propose a partial relay selection protocol utilizing only the shadowing side information of the relays instead of their full channel side information in order to select a relay in a dual-hop relaying system through the available limited feedback channels and power budget. We then presented an exact unified performance expression combining the average bit error probability, ergodic capacity, and moments-generating function of the proposed partial relay selection over generalized fading channels. Referring to the unified performance expression introduced in [1], we explicitly offer a generic unified performance expression that can be easily calculated and that is applicable to a wide variety of fading scenarios. Finally, as an illustration of the mathematical formalism, some numerical and simulation results are generated for an extended generalized-K fading environment, and these numerical and simulation results are shown to be in perfect agreement.

关键词： Relays Fading Shadow mapping Wireless communication Signal to noise ratio Protocols Error probability

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Novel relations between the ergodic capacity and the average bit error rate

Novel relations between the ergodic capacity and the average...

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International Symposium on Wireless Communication Systems (ISWCS)

Ergodic capacity and average bit error rate have been widely used to compare the performance of different wireless communication systems. As such recent scientific research and studies revealed strong impact of designing and implementing wireless technologies based on these two performance indicators. However and to the best of our knowledge, the direct links between these two performance indicators have not been explicitly proposed in the literature so far. In this paper, we propose novel relations between the ergodic capacity and the average bit error rate of an overall communication system using binary modulation schemes for signaling with a limited bandwidth and operating over generalized fading channels. More specifically, we show that these two performance measures can be represented in terms of each other, without the need to know the exact end-to-end statistical characterization of the communication channel. We validate the correctness and accuracy of our newly proposed relations and illustrated their usefulness by considering some classical examples.

关键词： Bit error rate Fading Modulation Signal to noise ratio Communication systems Bandwidth Channel capacity

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Home-Based System for Stroke Rehabilitation

Home-Based System for Stroke Rehabilitation

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： William Durfee Huiqiong Deng David Nuckley Brandon Rheude Amy Severson Katie Skluzacek Kristen Spindler Cynthia Davey James Carey Department of Mechanical Engineering (Durfee) the Program in Physical Therapy and the Clinical and Translational Science Institute (Davey) University of Minnesota

ISBN: (纸本)9781424441211

A system was developed for home-based stroke motor rehabilitation of the ankle. A study was conducted to test the hypothesis that moving while concentrating will lead to greater recovery than movement alone. Sixteen post-stroke subjects participated, one half in a tracking training group and the other have in a move group. The tracking training group tracked a target waveform by moving their ankle to control the tracking cursor while the move group moved their ankle approximately the same amount but without target following. Over four weeks subjects completed 3600 trials. The results showed that the Tracking group had more improvement in ankle dorsiflexion compared to the Move group. The remaining assessment criteria showed no significant differences between the groups.

关键词： Stroke Rehabilitation Ankle Moving dorsiflexion of foot tracking Stroke

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Molecular dynamics simulations of phase transition of lamellar lipid membrane in water under an electric field

Molecular dynamics simulations of phase transition of lamell...

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作者： Sun, Sheng Wong, Joseph T. Y. Zhang, Tong-Yi Bioengineering Graduate Program Hong Kong University of Science and Technology Hong Kong Hong Kong Division of Life Science Hong Kong University of Science and Technology Hong Kong Hong Kong Department of Mechanical Engineering Hong Kong University of Science and Technology Hong Kong Hong Kong

Molecular dynamics simulations were conducted to investigate phase behaviors of lamellar lipid membranes in water under a uniform external electric field. Poration, deformation and fusion of membranes were induced and water/membrane interfaces changed from perpendicular to parallel to the electric field. The hydration level of the lipids determined whether the final phase was the lamellar or inverted columnar structure. The simulations provide insights into phase transitions of amphiphile solutions in electric fields and mechanisms of cell electrofusion. © 2011 The Royal Society of Chemistry.

关键词： Electric fields

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Outage Probability of Dual-Hop Partial Relay Selection with Feedback Delay in the Presence of Interference

Outage Probability of Dual-Hop Partial Relay Selection with ...

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IEEE International Symposium on Personal, Indoor and Mobile Radio Communications

作者： Fawaz S. Al-Qahtani Redha M. Radaydeh Hussein Alnuweiri Electrical & Computer Engineering Program Texas A&M University at Qatar Division of Physical Science and Engineering King Abdullah University of Science and Technology (KAUST)

ISBN: (纸本)9781457713460

In this paper, we investigate the outage performance of a dual-hop relaying systems with partial relay selection and feedback delay. The analysis considers the case of Rayleigh fading channels when the relaying station as well as the destination undergo mutually independent interfering signals. Particularly, we derive the cumulative distribution function (c.d.f.) of a new type of random variable involving sum of multiple independent exponential random variables, based on which, we present closed-form expressions for the exact outage probability of a fixed amplify-and-forward (AF) and decode-and-forward (DF) relaying protocols. Numerical results are provided to illustrate the joint effect of the delayed feedback and co-channel interference on the outage probability.

关键词： Random variable relaying Feedback relay Delayed Feedback Cochannel interference Raleigh fading channels interference destination

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Fighting failure with the internet

Industrial Engineer

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Industrial Engineer 2011年第6期43卷 31-36页

作者： Caryer Cook, Valerie G. Ali, Ahad Department of Mechanical Engineering Technology Penn State University-Behrend United States Department of Mechanical Engineering Master of Science in Industrial Engineering Program Lawrence Technological University United States IIE's Lean Division United States

A set of guidelines, illustrated with a case study of an international FMEA project facilitated with a Google Groups website, is aimed to help organizations optimize their use of Web-based collaborative environments. An FMEA team assembled in a physical location has drawbacks that can hamper performance and feasibility and the processes. Provision of an online venue for FMEAs enables collaboration with external entities, thus improving the quality of the information developed. The purpose of the FMEA process is to bring together people with unique experiences and perspectives to generate information that no one person could visualize alone. A process FMEA must have manufacturing engineers or people involved directly with the process, whereas a design FMEA may have a manufacturing representative to provide additional perspective. A meeting conducted by the FMEA team included elements such as limited period time for completing team tasks and confirming website availability.

关键词： Websites

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Evolution of the Contact Area During an Indentation Process

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MRS Online Proceedings Library 2011年第1期436卷 165-170页

作者： Kangjie Li T. W. Wu J. C. M. Li Materials Science Program Department of Mechanical Engineering University of Rochester Rochester USA IBM Research Division Almaden Research Center San Jose USA

The evolution of the contact area during an indentation process has been examined by an a.c. technique and also by finite element analysis on five different bulk materials. The consistency of the results obtained by the two approaches not only show the validity and advantage of the a.c. technique but also corroborate the applicability of the elastic contact equation.

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