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دسترسی آزاد مقاله
1 - استفاده از مدل کراس کوپل شده به‌منظور طراحی خازن منفی در فناوری CMOS
محسن کاتبي جهرمي محسن صفویدر این مقاله از مدل کراس کوپل شده به‌منظور طراحی خازن منفی در فناوری CMOS استفاده شده و در ادامه به بررسی و مطالعه خازن منفی و کاربرد آن در مدارات گوناگون پرداخته شده است. مدار پیشنهادی در نرم‌افزار کیدنس با استفاده از فناوری 180 نانومتری به‌وسیله یک خازن 5 پیکو فاراد ت چکیده کاملدر این مقاله از مدل کراس کوپل شده به‌منظور طراحی خازن منفی در فناوری CMOS استفاده شده و در ادامه به بررسی و مطالعه خازن منفی و کاربرد آن در مدارات گوناگون پرداخته شده است. مدار پیشنهادی در نرم‌افزار کیدنس با استفاده از فناوری 180 نانومتری به‌وسیله یک خازن 5 پیکو فاراد ترسیم گردیده است که اندازه تراشه با در نظر گرفتن خازن 5 پیکو فاراد برابر 80/152 میکرومتر در 40/61 میکرومتر می‌باشد. اندازه تراشه بدون خازن 32 میکرومتر در 40/61 میکرومتر است. در مرحله دوم، مدار پیشنهادی در نرم‌افزار ADS شبیه‌سازی شده و پاسخ فرکانسی و توان مصرفی آن بررسی شده است. نتایج شبیه‌سازی نشان می‌دهد که با خازن بار 5 پیکوفاراد تا فرکانس 500 مگاهرتز، خازن منفی در بازه 5/1- تا 20- پیکوفاراد ایجاد شده که توان مصرفی آن با منبع تغذیه 8/1 ولت در حدودmW 5/3 است. محدوده فرکانسی خازن منفی وسیع و مصرف توان نسبتاً پایین و ضریب کیفیت مناسب از مزیت‌های مدل پیشنهادی است. پرونده مقاله -
دسترسی آزاد مقاله
2 - Study of an argon dielectric barrier discharge reactor with atmospheric pressure for material treatment
Maryam Hosseinpour Akbar ZendehnamAbstractIn this study, effects of the variation in the dielectric barrier discharge’s (DBD) gap distance and the nature of dielectric layers which cover both of the reactor electrodes on the electron density, mass fraction of excited argon atoms across the discharge gap چکیده کاملAbstractIn this study, effects of the variation in the dielectric barrier discharge’s (DBD) gap distance and the nature of dielectric layers which cover both of the reactor electrodes on the electron density, mass fraction of excited argon atoms across the discharge gap, mean electron energy, ion and electron current density, and electron temperature are investigated at atmospheric pressure. In order to find the optimal reactor gap, the DBD’s average power consumption is studied. The achievements show that when the value of dielectric constant is increased from 7.6 to 10, discharge gap of 1 mm still demonstrates the maximum power consumption, which can be considered as the optimum discharge gap. To optimize the characteristics of one-dimensional modeling of DBD system for material treatment, various types of materials with different values of the permittivity [aluminum, glass (quartz) and silicon] are embedded in the discharge gap between the two electrodes. In this case, the reactor gap is changed from 0.5 mm to 2 mm, while the dielectric constant of the dielectric layers which cover both of the metallic electrodes is assumed to be 10. Compared to the other examined materials, our numerical results illustrate that the treated material with higher value of the relative permittivity (silicon) has greater influences on the variations in the electron density, argon ion density and also total plasma current density than in the values of excited argon atom density, mass fraction of excited argon atoms and also average power consumption. پرونده مقاله -
دسترسی آزاد مقاله
3 - Hierarchal Grouping Strategy with Adaptive Power Tuning in ZigBee Wireless Sensor Networks
Mehran Pourmohammad Abdollahi Javad Musevi Niya Payman Mahmoudi BirounDesigning wireless sensor networks should meet appropriate parameters such as quality of service (QoS) defined by different users. The variable physical conditions of the environment, processing and transmission power limitations and limited communication capabilities a چکیده کاملDesigning wireless sensor networks should meet appropriate parameters such as quality of service (QoS) defined by different users. The variable physical conditions of the environment, processing and transmission power limitations and limited communication capabilities are the most important obstacles that influence QoS parameters such as throughput, delay, reliability and network lifetime. The most important problems that directly have destructive effects on these parameters are hidden and exposed node problems. These problems extremely decrease throughput and increase delay and power consumption in the network. In this paper, we propose a new and efficient method that relies on clustering, grouping and subgrouping strategy to create smaller zones and avoid collisions. By allocating different transmission powers to different nodes depending on their hierarchy level in the network, the mentioned problems decrease and as a result power consumption decreases due to reduction in the retransmissions. This mechanism has been simulated by OPNET on IEEE802.15.4/Zigbee پرونده مقاله -
دسترسی آزاد مقاله
4 - An optimal VM Placement in Cloud Data Centers Based on Discrete Chaotic Whale Optimization Algorithm
mohammad masdari sasan Gharehpasha ahmad jafarianCloud computing, with its immense potentials in low cost and on-demand services, is a promising computing platform for both commercial and non-commercial computation applications. It focuses on the sharing of information and computation in a large network that are quite چکیده کاملCloud computing, with its immense potentials in low cost and on-demand services, is a promising computing platform for both commercial and non-commercial computation applications. It focuses on the sharing of information and computation in a large network that are quite likely to be owned by geographically disbursed different venders. Energy efficiency in data centers has become a hot topic in recent years as more and larger data centers have been established and the electricity cost has become a major expense for operating them. Server consolidation using virtualization technology has become an important technology to improve the energy efficiency of data centers. Virtual machine placement is the key in server consolidation. In the past few years, many approaches to virtual machine placement have been proposed, but existing virtual machine placement approaches to the virtual machine placement problem consider the energy consumption by physical machines. In this paper, we proposed a new approach for placement based on Discrete Chaotic whale optimization Algorithm. First goal of our presented algorithm is reducing the energy consumption in datacenters by decreasing the number of active physical machines. Second goal is decreasing waste of resources and management of them using optimal placement of virtual machines on physical machines in cloud data centers. By using the method, the increase in migration of virtual machines to physical machines is prevented. Finally, our proposed algorithm is compared to some algorithms in this area like FF, ACO, MGGA, GSA, and FCFS. پرونده مقاله -
دسترسی آزاد مقاله
5 - Investigating and Analyzing the Effect of Router Components on Network Performance on the Chip with Regard to Power Consumption
Farnaz Zogh Azadeh Alsadat Emrani Zarandi Vahid Sattari NaeiniA network on the chip is a solution to connection problems compared with traditional-based chip which can fulfil multi-dimensional communication requirements. The router is a key component of the communication network which is referred as its backbone. Since the router چکیده کاملA network on the chip is a solution to connection problems compared with traditional-based chip which can fulfil multi-dimensional communication requirements. The router is a key component of the communication network which is referred as its backbone. Since the router occupies the largest area on the chip and it is the most widely used network component, in this paper, the architecture of the router in the network on the chip is examined and its roles with its components and their effect on the performance of the network are investigated, considering the parameters including time (delay), the area and more importantly the power consumption. It is shown that any modification, combination, or correction in any of the component effect on power consumption of the router and hence on the power consumption of the whole chip. To this end, the related works are examined to make an appropriate estimation of their analogy. This article will help researchers who are trying to design an optimal router based on power consumption. پرونده مقاله -
دسترسی آزاد مقاله
6 - High-Speed Ternary Half adder based on GNRFET
Mahdieh Nayeri Peiman Keshavarzian Maryam NayeriSuperior electronic properties of graphene make it a substitute candidate for beyond-CMOS nanoelectronics in electronic devices such as the field-effect transistors (FETs), tunnel barriers, and quantum dots. The armchair-edge graphene nanoribbons (AGNRs), which have sem چکیده کاملSuperior electronic properties of graphene make it a substitute candidate for beyond-CMOS nanoelectronics in electronic devices such as the field-effect transistors (FETs), tunnel barriers, and quantum dots. The armchair-edge graphene nanoribbons (AGNRs), which have semiconductor behavior, are used to design the digital circuits. This paper presents a new design of ternary half adder based on graphene nanoribbon FETs (GNRFETs). Because of reducing chip area and integrated circuit (IC) interconnects, ternary value logic is a good alternative to binary logic. Extensive simulations have been performed in Hspice with 15-nm GNRFET technology to investigate the power consumption and delay. Results show that the proposed design is very high-speed in comparison with carbon nanotube FETs (CNTFETs). The proposed ternary half adder based on GNRFET at 0.9V exhibiting a low power-delay-product (PDP) of ~10-20 J, which is a high improvement in comparison with the ternary circuits based on CNTFET, lately proposed in the literature. This proposed ternary half adder can be advantageous in complex arithmetic circuits. پرونده مقاله -
دسترسی آزاد مقاله
7 - High-Speed Ternary Half adder based on GNRFET
Mahdieh Nayeri Peiman Keshavarzian Maryam NayeriSuperior electronic properties of graphene make it a substitute candidate for beyond-CMOSnanoelectronics in electronic devices such as the field-effect transistors (FETs), tunnel barriers, andquantum dots. The armchair-edge graphene nanoribbons (AGNRs), which have semic چکیده کاملSuperior electronic properties of graphene make it a substitute candidate for beyond-CMOSnanoelectronics in electronic devices such as the field-effect transistors (FETs), tunnel barriers, andquantum dots. The armchair-edge graphene nanoribbons (AGNRs), which have semiconductor behavior,are used to design the digital circuits. This paper presents a new design of ternary half adder basedon graphene nanoribbon FETs (GNRFETs). Due to reducing chip the area and integrated circuit (IC)interconnects, ternary value logic is a good alternative to binary logic. Extensive simulations have beenperformed in Hspice with 15-nm GNRFET technology to investigate the power consumption and delay.Results show that the proposed design is very high-speed in comparison with carbon nanotube FETs(CNTFETs). The proposed ternary half adder based on GNRFET at 0.9V exhibiting a low power-delayproduct(PDP) of ~10-20 J, which is a high improvement in comparison with the ternary circuits basedon CNTFET, lately proposed in the literature. This proposed ternary half adder can be advantageous incomplex arithmetic circuits. پرونده مقاله -
دسترسی آزاد مقاله
8 - Optimization of Reduction Settings and Inter-stand Tensions for Tandem Cold Mills using Genetic Algorithm
فرشید آقاداوودی حسین گلستانیان نوید نگهبانیCold rolling process is a complicated process which can be optimized by changing in variables and settings. This paper presents a set-up optimization system developed to calculate reductions and inter-stand tensions for each stand of a five stand tandem cold mill. The چکیده کاملCold rolling process is a complicated process which can be optimized by changing in variables and settings. This paper presents a set-up optimization system developed to calculate reductions and inter-stand tensions for each stand of a five stand tandem cold mill. The main objective in this optimization is minimization of power consumption. First, by using the analytical method, the equations of roll force and roll torque have been determined. The Genetic algorithm has been used to find out the optimum reduction setting and inter-stand tension which minimized the power consumption in five roll stands. The results have been compared with experimental data. Finally, the influence of effective parameters such as lubricants and strength of plates is studied. The results have been shown a similar pattern in reduction setting. پرونده مقاله
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