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A performance of circuit breaker is dependent on the dynamic behavior of spring operating mechanism (SOM) in terms of mechanical system. The response speed of the circuit breaker is one of important part in the performance of circuit breaker and the response speed of the circuit breaker was determined by latch mechanism. The latch mechanism consists of solenoid actuator and several linkages with joints...
This paper presents the design of a stable and efficient z-source voltage regulator using small signal analysis. Z-source ac-ac converter operates in buck-boost mode without any additional circuit. Controlling the shoot-through duty ratio, maintain the desired output voltage level. Proposed voltage regulator is replaced by traditional voltage regulator with additional features. Control transfer functions...
New services such as network virtualization, service chaining, and application-centric traffic steering bring new opportunities for network providers and service providers. While Software Defined Network is poised to support new services, it is still in development stage. Mechanisms supporting new services are still missing. In this paper, we propose a new application driven mechanism called Service...
Device-to-Device (D2D) communication is a proximity-based technique used by Long Term Evolution-Advanced (LTE-A) systems. When a ProSe-enabled UE in D2D communication moves across a cell boundary, seamless handover is expected. However, LTE-A does not specify D2D handover procedures, and the current LTE-A handover procedures cannot support the ProSe service continuity requirements [1]. Therefore,...
In this paper, a novel power factor correction (PFC)-inverter topology with enhanced performance is proposed for applying to electric vehicles (EVs) and energy storage system (ESS). The proposed topology can be operated as the several modes which include one inverter mode and four types of PFC mode. And operation method is analyzed in detail according to each mode. The feasibility of the proposed...
Multipopulation games model interactions among many agents who have various roles. The imitative protocol describes when and how each agent changes her action in multipopulation games. Under existing imitative protocols, each agent imitates only agents who belong to the population that she belongs to. In other words, it is assumed that each agent knows the populations that the other agents belong...
This paper presents the modeling and simulation of integrated CUK converter with EPP MPPT for grid connected photovoltaic system. Integrated CUK converter is presented for the use as a high gain boost (step- up) converter whose switch operates in continuous conduction mode. MPPT controllers are used in PV system to track the maximum power due to its poor efficiency. The system is designed in MATLAB/SIMULINK...
Krylov subspace methods (KSMs) are widely used insolving large-scale sparse linear problems. The orthogonalizationprocess in methods like GMRES would consume a majorityof the time. Since modern manycore architecture based acceleratorshave provided great horsepowers for computations,communication overheads remain a bottleneck, especially inclusters with a great number of nodes. The HA-PACS/TCA ofTsukuba...
We present in this short study, some of the well-known problems with the current legacy support for 2G cellular networks, and the security and authentication problems this poses, as demonstrated in recent document leaks about spying from US embassies [1]. We have conducted focused radio measurements in the Helsinki Metropolitan area on these security problems and present some of the findings here...
Radio Frequency Identification (RFID) systems with dense tag populations face the problem of tag collisions, i.e. simultaneous replies of multiple transponders in a single slot. State-of-the-art RFID readers can use two methods for resolving this collision problem. The first method bases on Dynamic Frame Slotted ALOHA (DFSA) for optimizing the frame length, which results in a reduced number of collisions...
This paper discusses the effect of the trench depth on the channel temperature in linear mode and thus on the linear mode capability of trench technology MOSFETs. The linear mode operation of MOSFETs is not characterized, qualified and is not tested very detailed by most of the manufacturers. Therefore the parameters that can have an effect on the linear mode capability are not very well known. We...
The need of monitoring the water level of troughs is increasing. This is parallel with the growing of Wireless Sensor Network and Internet of Thing. By combining both approach, cattlemen can monitoring their troughs ubiquitous using their own personal device. This paper develop such system by using LoRa™ as the media between sensor hub and nodes, while Raspberry Pi is used as the gateway to push data...
In this paper, a power efficient self-organized virtual small networking protocol is proposed to save network-wide power consumption in cellular networks. The meta-heuristic firefly algorithm is proposed to arrange the base stations (BSs) into several groups based on a well-defined brightness, which is a traffic load related factor. By jointly considering the load balance in each BS group, the effectiveness...
The heterogeneous network (HetNet) which consists of several small cell base stations (BSs) and an overlaid macro cell BS is a promising solution to accomplish very high data rate and energy-efficient communication. The design of energy-efficient mechanisms and radio resource allocation among BSs is an important issue in HetNet. There are a variety of ON/OFF switching algorithms for BSs in the literature...
In this paper, we define a collision area in a heterogeneous cellular network for the purpose of interference management between Device-to-Device (D2D) and conventional cellular (CC) communications. Currently, most D2D routing algorithms assume synchronized accurate location knowledge among users and the base stations. In reality, this level of location accuracy is difficult and power consuming in...
Energy harvesting is emerging as a promising approach to improve the energy efficiency (EE) and to extend the life of wireless networks. This paper focuses on energy-efficient transmission power allocation techniques for a point-to-point communication channel, equipped with a fixed-power battery, as well as a harvest-use battery. Using the fact that the harvested energy does not consume from the fixed...
Green, i.e., energy-efficient, communications technologies have been a trend for next-generation cellular communications systems. An imperative question for network operators to address is whether and to what extent one should move to embrace such newly proposed green communications technologies. On one hand, the introduction of green communications technologies saves the operating cost, and on the...
Delay Tolerant Networks (DTNs) have gained importance in the recent past, as cost-effective alternative, in scenarios where delays can be accommodated. They work well in discretely connected network, where there is no direct connectivity between some/all components of the system. But the mobility of nodes creates occasional contact opportunities. The randomly moving nodes cooperate to help a fixed...
In this paper, a complete characterization of the continuous state observability is derived for serial multicellular converter based on hybrid systems approach. More precisely, a necessary and sufficient condition for the continuous state observability for a given switching signal is elaborated for n-cell converter. Concrete examples are reported to highlight the derived results.
In this paper we present the results of the delay measurements of the Ethernet traffic handled by different Open-Flow switches realized in the NetFPGA cards. We investigated three different software approaches: reference software for Open-Flow on NetFPGA cards, xDPd/ROFL prepared for OpenFlow implementation in NetFPGA cards and xDPD/ROFL library prepared for GNU/Linux cooperating with reference NIC...
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