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To overcome the hidden terminal problem a secondary user (SU) may encounter, cooperative spectrum sensing (CSS) is proposed and gained much attention in the last decades. However, due to the selfish nature, SUs may not cooperate unconditionally as most previous works have assumed. Therefore, how to stimulate SUs to play cooperatively is an important issue. In this paper, we propose a reputation-based...
To ensure the effectiveness of ultra-high-frequency (UHF) method on the on-line monitoring and live detecting of partial discharge (PD) for the gas-insulated metal-enclosed switchgear (GIS), this paper proposes a field calibration method for the UHF PD detection sensors in GIS, which is based on the forward propagation coefficient in the microwave network theory. Firstly, on a full-scare test platform...
Due to the tradeoff between spatial, spectral, and temporal resolution, there is no such a unified sensor that can produce images with fine spatial-, temporal-, and spectral-resolution simultaneously. However, facing an emerging need of fine spatial details, frequent coverage, and multi-spectral remotely sensed data for global change detection, image fusion technique that blends multi-sensors' characteristics...
We present the highly-sensitive Raman detection of various gases (nitrogen, oxygen, carbon dioxide, toluene, acetone and 1,1,1-trichloroethane) using a hollow core photonic crystal fiber probe and demonstrate its multiplexed gas sensing capability quantitatively.
In this paper, we introduce an improved self-adaptive localization algorithm based on DV-HOP for the node localization in wireless sensor network. We firstly divide the sensing area into several small regions according to the density of unknown nodes. Then, the beacon nodes are distributed within the sensing area in a reasonable manner, based on DV-HOP algorithm and combined with RSSI. The measured...
This paper demonstrates for the first time quantitative performance advantages of a zigzag 8T-SRAM (Z8T) cell over the decoupled single-ended sensing 8T-SRAM (DS8T) with write-back schemes, which was previously recognized as the most area-efficient cell under large σVTH/VDD conditions. Since Z8T uses only 1T for each decoupled read-port, faster 2T differential sensing (D2S) can be implemented within...
Voltage-dependent timing skews in precharge and sensing activities cause functional failure and reduce the speed of asynchronous SRAM. Data-dependent bitline leakage current further increases the timing skews and reduces the yield of asynchronous SRAM. A dual-mode self-timed (DMST) technique is developed for asynchronous SRAM to eliminate the timing-skew-induced failures and speed overhead across...
In this paper, we consider a relay-assisted cognitive cellular downlink system dynamically accessing a spectrum licensed to a primary network, thereby improving the efficiency of spectrum usage. A cluster-based relay-assisted architecture is proposed, where relay stations are employed for minimizing the interference to users in the primary network and achieving fairness for cell-edge users. Based...
We adopt the second-price auction mechanisms to solve the channel allocation as well as the out-band sensing assignment problems in cognitive radio. We introduce a cheating-proof operating method by realizing the pricing scheme in a real time format. To adapt to the dynamic environment, we also study the optimization problem in terms of strategic budget setting, bidding slot duration setting and supplementary...
This paper proposes a new practical modular power converter, combining with the new power electronics technologies: the emerging emitter turn-off (ETO) thyristor device, modular voltage source converter and digital control technology. A modularized ETO based power converter with digital local controller is designed and developed. Comparing with the conventional power converter, the proposed power...
This paper highlights the improved design and demonstration of the control power self-generation in the emerging new power semiconductor switch ETO. It also discusses the method utilized to achieve complete sensor integrations in the ETO. Conventional high power devices require dedicated external power supplies with isolation capability to operate. The isolation transformer lowers the system reliability...
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