Generation of vertex connected subgraphs for multi-input multi-output reliability networks

In this paper, the problem of evaluation of reliability (probability of success) of a network consisting of several inputs and outputs is studied. Edges are assumed to be perfect and vertices are assigned the probabilities of success. A new concept called “vertex connected subgraph” is introduced for this purpose. This concept is useful even for dense graphs because they are of the order of 2^(v-k-1) which is independent of e, where ν(e) is the number of vertices (edges) and k is the number of outputs of a graph.     

Microwave circuit analysis and design by a massively distributedcomputing network

The advances in microelectronic engineering have rendered massively distributed computing networks practical and affordable. This paper describes one application of this distributed computing paradigm to the analysis and design of microwave circuits. A distributed computing network, constructed in the form of a neural network, is developed to automate the operations typically performed on a normalized Smith chart. Examples showing the use of this computing network for impedance matching and stabilizing are provided     

Evaluation of the suitability of troposcatter prediction techniques over Northern India

The design of any radio communication system requires a suitable prediction technique for calculating the received signal levels. The optimum prediction method helps to reduce the interference problems, and improves reliability of links. In the present study the path loss values deduced from various prediction techniques are compared against observed path loss values over two troposcatter links situated in northern India. The results show that April and May are the worst months and the present space and frequency diversity configuration is not able to effectively overcome the link outages. A comparison of different path loss prediction techniques showed that Yeh’s prediction method and itu-r’s method I comes close to the observed values. The predicted path loss values for worst month using itu-r’s method deviated considerably from the observed values. The present study provides valuable inputs to the itu-r study group from the tropical countries by evaluating the itu-r prediction methods against the experimental data.     

BETaaS: A Platform for Development and Execution of Machine-to-Machine Applications in the Internet of Things

Wireless Personal Communications - The integration of everyday objects into the Internet represents the foundation of the forthcoming Internet of Things (IoT). Smart objects will be the building...     

MECOR: Minimal Energy Consumption with Optimized Routing in MANET

Energy and routing efficiency is a long-research topic from past decades in the area of MANET. The prior research contribution focusing on addressing both the issues are associated with issues like (1) few benchmarked studies, (2) adoption of conventional routing protocols based on shortest path to mitigate both issues, and (3) inefficient design principles of routing. Hence, this paper proposes a novel routing protocol in mobile ad hoc network (MANET) termed as MECOR i.e. minimal energy consumption with optimized routing. MECOR presents a simple communication strategy based on mathematical and signaling properties of mobile nodes in MANET to jointly address the energy and routing issues in MANET. The outcome of the MECOR was compared with conventional routing algorithm as well as recent studies of energy efficient routing policy to find that MECOR can minimize 58.82 % of energy in most challenging mobility scenarios of MANET.     

Space-frequency linear dispersion codes for single carrier-frequency domain equalization

This letter addresses the application of Linear Dispersion Codes (LDC) in space and frequency domains in Single Carrier - Frequency Domain Equalization (SCFDE) systems. Space-Frequency (SF)-LDCs are more suitable than Space- Time (ST)-LDC in high mobility environments. However, the application of LDCs in space and frequency domains in SCFDE systems is not straightforward as in Orthogonal Frequency Division Multiplexing (OFDM) systems because in this case there is no direct access to subcarriers at the transmitter. This letter shows that it is possible to induce a target SF symbol dispersion in SCFDE by using a simple linear pre-coder and a conventional LDC that spreads the symbols in time and space domains according to specific ST dispersion matrices. The letter shows how to derive the ST dispersion matrices to be used at the transmitter as a function of the dispersion matrices describing the target SF dispersion. The presented procedure can be applied to both pure transmit diversity and pure multiplexing schemes, which are special cases of LDCs. Therefore, the proposed scheme provides a low complexity implementation of any dispersion in space and frequency over SCFDE systems, which alternatively would require the use of FFT/IFFT also at the transmitter side. The letter also shows a performance comparison of SF-LDCs and ST-LDCs in a typical propagation environment for future radio systems. The comparison confirms the suitability of using the dispersion in frequency rather than time for a wide range of coherence bandwidths.     

Implication of molecular orientation on charge transport and gas sensing characteristics of cobalt–phthalocyanine thin films

Charge transport and gas sensing characteristics of cobalt phthalocyanine films deposited along (ATB) and perpendicular (PTB) to the natural twin boundaries of (0 0 1) LaAlO₃ substrate have been investigated. The charge carrier mobility of ATB films (∼5 cm² V⁻¹ s⁻¹) is five orders of magnitude higher compared to that of PTB films (∼7 × 10⁻⁵ cm² V⁻¹ s⁻¹), suggesting that twin boundaries acts like a template for ordering of molecules. The ATB films on exposure to ammonia showed a reversible increase of resistance, with fast response and recovery. In contrast PTB films showed same sensitivity, but exhibits base resistance drift along with sluggish response.     

利用基于扫描相机的荧光寿命成像显微技术研究细胞周期

利用基于扫描相机的荧光寿命成像显微系统,以细胞周期为模型,研究转染绿色荧光蛋白的HeLa细胞的荧光寿命。结果表明,处于周期内不同进程的细胞的荧光寿命为2.50~3.00 ns。处于分裂期的细胞的荧光寿命在1 h内从2.86 ns下降到2.82 ns;在DNA合成前期的8 h内,荧光寿命从2.82 ns下降到2.78 ns。荧光寿命的差异反映了细胞周期中核浆内大分子浓度的变化,对了解细胞周期的分子机制有一定的意义。     

Light-Weight AAA Infrastructure for Mobility Support Across Heterogeneous Networks

Security and privacy architecture for various access networks have often been considered on the upper service layers in the form of application and transport security and from lower layers in the form of security over wireless networks. Today there is no trust relationship between the stakeholders of different access network types for e.g. wireless mesh network, wireless PAN, wireless LAN, cellular network, satellite etc. and each have their own security mechanism. What is common for these access networks is the networking layer which is IP based. In order to provide seamless service across these heterogeneous access networks there must be a trust relationship among the stakeholders for authentication, authorization, accounting and billing of end user. However, what is still missing is a general solution which is both adaptable to the network types and conditions and also takes into account end system capabilities as well as enabling inter-domain AAA negotiation. This paper proposes a light-weight AAA infrastructure providing continuous, on-demand, end-to-end security in heterogeneous networks.     

Performance Evaluation of Inversion Mode and Junctionless Dual-Material Double-Surrounding Gate Si Nanotube MOSFET for 5-nm Gate Length

Semiconductors - In this work, drain current ID for 5-nm gate length with dual-material (DM) double-surrounding gate (DSG) inversion mode (IM) and junctionless (JL) silicon nanotube (SiNT) MOSFET...