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This paper describes a methodology for hardware/software formal co-verification. In the proposed methodology, a unified computational model is constructed for a hardware/software system under verification, in which the software and the hardware are tightly connected. In addition, we proposed a systematic method to formulate properties for the system using extracted information from software programs...
The characteristics of a novel broadband electromagnetic band-gap (EBG) design based on Sierpinski Gasket triangles are presented in this paper. These triangles, which are the equilateral triangles, are arrangement repeated each 600 to introduce the hexagonal unit cells without vias. Model of this EBG structure have been developed and constructed on an inexpensive Fire-Retardant 4 (FR4) with thickness...
The objective of this work is the design of a 32×32 element X-band reflectarray, in which the re-radiated elements have no conventional shape and enough degrees of freedom to compensate both the spatial and frequency phase variation of the re-radiated field. In particular, here we focus on a re-radiating element consisting in two concentric square rings in which two different and quite independent...
Wireless sensor networks (WSNs) are expected to be deployed in various areas in the future for monitoring and interacting with the physical environment. The sensors are constraint devices, so 6LoWPAN is proposed by IETF to adapt IPv6 into the WSNs environment. However, due to the use of short address and compression, IPv6/IPv4 enabled devices cannot support the 6LoWPAN adaptation layer as well as...
In this paper, we present a systematic experimental study of negative capacitance (NC) effect in p-i-n and p-n junctions of light-emitting devices. The focus is the dependence of NC on injected current mixed with a small ac signal (1 kHz – 13 MHz) at variable temperature in forward-biased light-emitting diode (LED) and laser diode (LD). The NC effect is shown by our measurement results to be strong...
We propose an optically coherent self-heterodyne transceiver structure for differential quadrature amplitude modulation (QAM) transmission. The scheme is based on phase modulation detection that potentially simplifies the front-end of a coherent optical receiver. The scheme has been demonstrated via extensive simulations for 16-QAM at 40 Gb/s and 256-QAM at 100 Gb/s, together with a novel phase noise...
We evaluate inter-channel crosstalk level and its power penalty for the wavelength division multiplexed passive optical network (WDM-PON) system employing injection seeding technology. We propose a new laser control algorithm for reducing received power variations at multi-path interface of the injection seeded WDM-PON. And we achieve an improvement of the inter-channel crosstalk level to reduce crosstalk...
A simple security system based on acceleration sensors for orchards is proposed to detect malicious picking activities by humans. The system reliably detects and accurately recognizes abnormal movements of tree branches. Experiments are conducted to verify its feasibility, especially its ability to discriminate normal movements, e.g. by wind, from abnormal ones. The results show that abnormal movements...
Online social networks (OSNs) become more and more important in today's social and business life. Therefore, considerable effort is put in research to gain a deeper knowledge of the development of these networks and their dynamics. However, most of the existing literature is based on very limited subsets of the network data, which is often filtered by the OSN operator providing the data or biased...
REMUS is a coarse-grained dynamically reconfigurable computing system proposed for multimedia and communication baseband processing applications. H.264/AVC is the latest video coding standard which achieves dominant coding efficiency compared with previous standards. However, its high computational complexity and huge memory access bandwidth make it difficult to implement by traditional processors...
In this contribution, we focus on energy-aware devices able to reduce their energy requirements by adapting their performance. We propose an extension of an analytical model to accurately represent the impact of green networking technologies - namely, low power idle (LPI) and adaptive rate (AR) - on network- and energy-related performance indexes. We focus on a packet-processing engine within a switching...
In this paper, we consider a special case of non-regenerative multi-group multi-way relaying channel where the number of half-duplex antennas at relay is less than the total number of nodes. The number of communication phase to complete the full data exchange equals to the maximum number of nodes among all groups. The first phase is multiple-access and the other phases are broadcast. In each broadcast...
The increasing usage of wireless networks creates new challenges for wireless access providers. On the one hand, providers want to satisfy the user demands but on the other hand, they try to reduce the operational costs by decreasing the energy consumption. In this paper, we evaluate the trade-off between energy efficiency and quality of experience for a wireless mesh testbed. The results show that...
This paper investigates the impact of windowing on the power allocation in cognitive radio (CR) system. The investigation shows that introducing windowing significantly improves the power allocation and transmission rate of CR as it effectively reduces interference introduced by CR system. Although the windowing technique has been widely introduced to OFDM-based systems, such as WLAN [1], its effect...
In this paper we study base station sleep modes, which are today considered a viable approach to improve the energy efficiency of cellular access networks, by reducing power consumption in periods of low traffic.
This paper focuses on the research and development of a human resource management (HRM) system which is based on face authentication and RFID technology for more efficient security and reliability. In the proposed system, a user ID is first read from the given RFID tag to retrieve the corresponding records from the database to be used in the authentication process together with the user image which...
Support vector data description (SVDD) has been widely used in pattern classification, however it does not provide high performance in brain-computer interface (BCI) classification problems since brain signals are noisy and chaotic. Brain data have distinct distributions and hence a hyper-sphere in SVDD could not well describe the data. We propose in this paper a multi-sphere approach to SVDD to have...
The application of polar coding to rate-adaptive asymmetric Slepian-Wolf coding is considered. The encoder transmits the syndrome set which includes high entropy bits to the decoder to achieve the optimal compression. It means that the encoder must know the correlation between two sources and the syndrome set varies according to this correlation. In this paper, we propose polar source coding scheme...
In this work, we consider the relay selection (RS) method for an Amplify-and-Forward (AnF) relaying system in multi-cell environments. The selection scheme aims to maximize the instantaneous received signal-to-noise and interference ratio (SINR). We propose an idea of combining RS with interference cancellation (IC) at the receiver. Furthermore, we analyze the system outage probability performance...
Cognitive Radio (CR) have been proposed as a method that improving the spectrum usage for more efficient. However, when sharing spectrum with others communication system, the most important thing is how much interference cause harmful to them. With TV-band also, the digital television (DTV) can tolerate the interference from other system with their threshold. The sharing spectrum regulation that guarantee...
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