DSpace collection: 期刊論文

User-provided multimedia content distribution architecture in mobile and ubiquitous communication networks

title: User-provided multimedia content distribution architecture in mobile and ubiquitous communication networks abstract: The network convergence of wired, wireless, and mobile systems creates a ubiquitous network environment where modern networking devices feature multiple networking interfaces and can connect to different networks simultaneously. Mobile users in ubiquitous networks expect to access information services anytime, and from anywhere. This paper presents a mobile content sharing scenario in which a networked device can discover neighboring devices and share multimedia content in a convenient, networked manner. This ideal scenario differs from the traditional usage which requires the tedious manual operations of connection setup and file transfer. To achieve this goal, this study proposes a user-provided multimedia content distribution architecture for a mobile and ubiquitous network environment. The proposed architecture integrates several specific mechanisms, including device discovery, asynchronous content delivery, secure access control, and virtual file system. This design addresses several inherent limitations in wireless and mobile networks, and enables mobile users to transfer media content in a secure, mobile, and energy-saving way. The proof-of-concept prototype and performance evaluation in this study confirm that the proposed architecture not only provides better user experience, but also achieves a lightweight design without compromising performance. (C) 2010 Elsevier Ltd. All rights reserved.

Use of raised cosine interpolator filter for timing recovery

title: Use of raised cosine interpolator filter for timing recovery abstract: In this article the interpolation filter using truncated raised cosine pulse for timing recovery is investigated. The results reveal that with similar computational complexity, the raised cosine interpolator is superior to other interpolators such as the sinc, polynomial, and MMSE interpolators. The superiority of the raised cosine interpolator is also demonstrated on digital magnetic recording channel. Simulation results show that the raised cosine interpolator is superior in error performance to other interpolators. The main advantage of raised cosine interpolator is that it is potentially simpler and can lead to a fully digital implementation.

Urinary CD14 as a potential biomarker for benign prostatic hyperplasia - discovery by combining MALDI-TOF-based biostatistics and ESI-MS/MS-based stable-isotope labeling

title: Urinary CD14 as a potential biomarker for benign prostatic hyperplasia - discovery by combining MALDI-TOF-based biostatistics and ESI-MS/MS-based stable-isotope labeling abstract: Purpose: Quest for specific urinary biomarkers for benign prostatic hyperplasia (BPH). Experimental design: Proteomics studies were conducted with urines of the training set to discovering marker candidates that could differentiate BPH from normal subjects by matching results deduced from MALDI-TOF of individual samples and results deduced from nanoLC-ESI-MS/MS-based stable isotope dimethyl labeling of two pooled samples (BPH and normal). Samples were digested before analysis and such an approach takes into account the subject-to-subject variation and differential amount, as well as protein identification. Selected markers were validated by ELISA conducted on the training set and the test set as well as another set of urines collected from prostate cancer patients. Results: Nine marker candidates were identified from proteomics studies; CD14, prostate-specific antigen and pancreatic a-amylase precursor were further selected for ELISA validation. Urinary CD14 is among the best match with high specificity (>81%) for both training and test sets. In addition, from the study of prostate cancer patients, CD14 also allows the distinction of BPH from cancer with high specificity (84-100%) when combined with urinary prostate-specific antigen. Conclusions and clinical relevance: Urinary CD14 is suggested to have a high specificity in the diagnosis of BPH in distinction from normal as well as cancer subjects.

Study of Heuristic MAP Selection and Abstraction Schemes with Load Balance in HMIPv6

title: Study of Heuristic MAP Selection and Abstraction Schemes with Load Balance in HMIPv6 abstract: In order to improve the performance of real time services in the mobile environment, the hierarchical approach was proposed to reduce the frequency of handoffs in the mobile IPv6 environment. The mobility anchor point (MAP) is adopted in a hierarchical manner to handle the location management of the mobile node within the MAP domain. An enhanced speed estimation scheme is provided in this paper to select the appropriate MAP so that the overhead of handoff can be minimized. Furthermore, the concept of abstract MAP (AMAP) node is proposed to extend the coverage domain of MAP. In addition to selecting a MAP with respect to the speed estimation of the mobile node in a heuristic way, the criteria of load balance is also investigated in this study. The performance of the proposed scheme is examined through exhaustive simulations. And the simulation results show that the proposed scheme can effectively achieve the above objectives.