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Extended interaction oscillator based on a modulation electron beam is studied in order to develop a compact, miniaturization, and low voltage millimeter wave vacuum devices. A modulation electron beam can be obtained by a field emission carbon nanotube cold cathode electron gun based on a microstrip structure. A disc-loaded waveguide structure EIO operating in 2π mode is simulated. Simulation results...
Extended interaction oscillator (EIO) operated in the terahertz range puts greater demand on current density and brightness of electron beam. The pseudospark-sourced (PS) electron beam is an attractive candidate to drive such high frequency EIOs. The study of a THz EIO driven by a PS sheet electron beam is presented. This enables the advantages of a interaction circuit combined with the merits of...
Currently, many advanced countries are facing the problem of aging society. We challenge to design a senior protection system for protecting senior using image processing. This paper focus on protecting senior using in the toilet by detecting the dangerous situations in real-time. And these information will be sent to the family, hospital or the government for helping protect senior. In toilet room,...
From EISCAT VHF radar observations it is evident that polar mesosphere summer echoes (PMSE) often show obvious layers. PMSE overshoot describe the effect of dusty plasma parameters on overshoot characteristics curve. In this paper we obtain and compare different PMSE overshoot characteristic curves (OCCs) at 80–85km and 85–90km in one hour respectively, from based on the data observed by EISCAT 224...
Polar Mesosphere Summer Echoes (PMSE) are strong radar echoes that have been observed typically by the VHF radar in summer polar mesosphere and have closely relation with charged dust particles. Theoretical analysis and extensive experimental data show that polar mesosphere summer echoes (PMSE) present some kind of regular periodic changes, such as semidiurnal variations, diurnal variations, day-to-day...
The mode-hopping phenomenon in extended interaction oscillator (EIO) based on the multiple-gap topology resonant system is studied to verify the remarkable advantage of the electronic tuning property for EIO. In contrast to the conventional EIO where electron beam interacts with the standing-wave mode in a narrow operating voltage range, the presented EIO can operate in a sequence of neighboring backward-wave...
This paper proposes a hybrid approach to optimal day-ahead pricing for demand response management. At the customer-side, a comprehensive energy management system, which includes most commonly used appliances and an effective waiting time cost model is proposed to manage the energy usages in households (lower level problem). At the retailer-side, the best retail prices are determined to maximize the...
In this paper, we try to adopt the global optimization method to design vacuum electronic devices. Based on the platform of three dimensional particle-in-cell (PIC) CHIPIC, the modules of Particle Swarm Optimization (PSO) and Genetic Algorithm (GA) are designed to optimize vacuum electronic devices, respectively. The comparisons of PSO and GA are implemented to optimize the slow wave period structure...
The circuit suitable for the hollow electron beam (HEB) interaction was formed by parallel connecting of the sheet beam extended interaction klystron circuit at the angular direction. The analysis of this newly developed circuit shows it can interacts with the distributed HEB. To demonstrate this capability, a W-band extended interaction oscillator (EIO) with distributed HEB has been designed. A DC...
A compact three-cavity circuit with ladder type structure is designed for the pencil beam W-band extended interaction klystron (EIK). Circuit parameters such as coupling coefficient M, characteristic impedance R/Q and beam-loading conductance Ge are analyzed and optimized in the design procedure. The initial beam parameters are 18.1 kV, 0.2 A and 0.5 mm in diameter. Simulation predicts a saturation...
With the aging of structures such as bridges, buildings, and tunnels, investigating the cracking of concrete surfaces has become very important. The standard method for investigating cracks has usually been to perform a visual inspection and acoustic diagnosis. However, the inspection results when using these techniques vary depending on the experience of the inspector, causing there are not objectivity...
In this paper, we propose a distributed optimization algorithm for the demand response management with a comprehensive customer demand modeling framework in the smart grid. Different from the existing literature, the considered demand modeling framework considers not only the energy management modeling but also the appliance-level usage pattern learning models, both for time-shiftable loads. More...
Highly overmoded structures of sheet beam EIK are barriers for the stable operation in RF circuit. In this paper, 3D simulations of an output cavity are presented followed by the calculations of RF parameters and mode competition analysis. Simulation results indicate that potential mode competition is feasible to be alleviated by systematic optimization while meeting the other performance requirements...
This paper proposes a task scheduling algorithm for multi/many-core systems. To increase the quality of results on the low computational complexity, our algorithm uses two static priorities which are switched during task scheduling. In our experiments, we compared the proposed algorithm with a state-of-the-art algorithm. The experimental results show that the proposed algorithm yields the better schedule...
with the rapid development of the Internet, the explosive growth of the Internet-based technologies leads to a great improvement of cloud computing. And cloud storage technology is the pioneer of cloud computing technology. This paper proposes a system architecture of private cloud storage system. Private cloud storage system has some unique features compared to public cloud storage system. The private...
The development of quantum computer technology has brought unprecedented threats to traditional cryptography methods. So far, the combination of Quantum Key Distribution (QKD) and one-time pad cryptography is the best solution to overcome the problem since it makes provable information-theoretic secure encryption possible. While the final key generation rate of most QKD systems cannot meet the needs...
Instruction level parallelism is one of the basic ways of increasing the performance of current processors. One method to improve instruction parallelism is the chain technique, which bypasses execution results from one Arithmetic Logic Unit (ALU) to others. However, this technique cannot be used with the current superscalar processor scheduling method. We develop a scheduling method for the chain...
For the two graphics whose internal parameter matrix is known, their epipolar geometry can be determined through the image coordinate matching points which have been observed. However, matching noise will have some impact on the estimation of motion parameter. In this paper, the essential matrix is decomposed by factorization algorithm to get external parameters, which is based on the Singular Value...
This paper proposes a real-time pricing scheme for demand response management in the context of smart grids. The electricity retailer determines the retail price first and announces the price information to the customers through the smart meter systems. According to the announced price, the customers automatically manage the energy use of appliances in the households by the proposed energy management...
Serious aging society is very severe problem in the world. We aim at developing a safety system to support the aged people. Toilet danger detection system (TDDS) is a part of the safety system, which detects the danger and announces the information to outside people. Toilet is a small place for special needs. If there is a dangerous zone in the toilet, it will be more dangerous for aged people than...
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