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Traditional wireless sensor networks (WSNs) are consist of sensor nodes with limited battery energy power. Due to rapid development of wireless power transfer technology, sensors can be recharged when they are within limited charging ranges of mobile devices and we call this kind of network rechargeable WSN(RWSN). In RWSN, mobile chargers (MC) are employed to recharge the sensor nodes. However, since...
Delay-Tolerant Mobile Sensor Network (DTMSN) distinguishes itself from traditional Wireless Sensor Network by several distinctive characteristics. Since end-to-end connections in DTMSN exist with certain probability, the conventional routing protocols for WSN may achieve poor network performance under these challenging scenarios. Hotspot-Based Adaptive Routing (HAR) is a routing scheme designed for...
With increasing interest in the concept of cloud multimedia and the popularization of hand-held devices, users gradually view videos in mobile network streaming mode rather than off-line mode. However, the delays and lags resulted from the instability of a mobile network will greatly degrade streaming quality for users. In cloud multimedia streaming services, when there are multiple optional streaming...
In recent years, the market of mobile device keeps growing dramatically. Apple iPhone and Google Android are the two representatives of this kind of devices. However, the mobile applications of these platforms can only be executed on some specific platforms; these applications are not portable to other platforms. Another kind of application is Web-based widget, such as Yahoo! Mobile Widget. This kind...
The development and acceptance pace of Mobile Learning Technologies are increasing rapidly as there are abundant applications for mobile learning technologies in education, from the ability to convey learning modules as well as facilitating learners to communicate and learn "on-the-go". Mobile Learning in Chinese has become to play a role in the attainment of Chinese proficiency, therefore,...
Pervasive information gathering has became more and more important in people's daily life during the last decade. However, in some critical network scenarios such as Delay-Tolerant Mobile Sensor Network (DT-MSN), due to the sparse connectivity, node mobility and limited buffer, the traditional approaches for collecting information application may not work effectively without a stable end-to-end path...
In this paper, we have developed a two-dimensional (2D) chaos-based encryption scheme that can be applied to electroencephalography (EEG) signals, and mobile telemedicine. Compared with the one-dimensional (1D) chaos-based encryption scheme, the proposed 2D schemes uses the concept of parallel processing is to increase the encryption speed. An essential feature of the proposed scheme is that signals...
This work demonstrates the first fabricated macro-level RRAM-based nonvolatile SRAM (nvSRAM) that use a new 8T2R (Rnv8T) cell to achieve fast NVM storage and low VDDmin read/write operations. The Rnv8T cell uses two fast-write low-current RRAM devices, 3D stacked over the 8T, to achieve low store energy with a compact cell area (1.6x that of a 6T cell). A 2T RRAM-switch provides both RRAM control...
During last two decades, Mobile Ad hoc Networks (MANETs) has been in widespread use. However, in some critical applications such as in battlefield or area sensing, due to the node mobility, limited power and sparse deployment density, MANETs may suffer network partitioning. Without a stable end to end path, these challenged scenarios could cause most existing ad hoc networks protocols to fail. In...
In this paper, we proposed a Ka band Wimax multi-satellites system. An essential feature of this scheme is that power assignment mechanism, the direct mapping strategy, unequal error protection scheme, and unequal level modulation are allocated to the information transmission that requires unequal bit error rate (BER). Simulation results show that the proposed scheme can not only fulfill the quality...
In this paper, we propose a chaos base unequal encryption mechanism for which can apply in mobile medicine system. A main idea for using chaos sequence is to increase the un- predication compared with other kind of random sequences. In addition, an essential feature of this unequal encryption scheme is that a bit stream mapping of ID chaotic scrambler and a permutation scheme are allocated to the...
The delay/fault-tolerant mobile sensor network (DFT-MSN) has been proposed for pervasive information gathering. DFT-MSN distinguishes itself from conventional sensor networks by several unique characteristics such as sensor mobility, loose connectivity, and delay/fault tolerability. This paper focuses on the performance evaluation of DFT-MSN. We first introduce a queuing model by using Jackson network...
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