1,721,285 research outputs found
Electrically driven 8-14 micron band solid-state modulator
No full textSimulation results for an electrically driven 8-14µm band, solid-state modulator based on a high purity germanium p-i-n diode are presented. Known carrier recombination mechanisms detrimental to device performance along with ways to reduce their effect are detailed. Device simulations using 'ATLAS', indicate that modulation depths of up to 99.5% attenuation for incident infrared radiation centred at 10.6µm can be achieved by using ion-implanted device construction and optimisation of the design parameters. Preliminary transient analysis attained higher modulation frequency when transient large bias voltage (2V) is used momentarily during switching
40Ar/39Ar Method of K-Ar Age Determination of Geological Samples Using Tsing-Hua Open-Pool (THOR) Reactor
No full textBalancing Inter-Ring Loads on SONET Dual-Ring without Demand Splitting
No full textn the survivability and simplicity aspect, SONET Self-healing Ring(SHR) is one of the most important schemes for the high-speed telecommunication networks. Since the ring capacity requirement is defined by the largest STS-1 cross-section in the ring, load balancing is the key issue in the design of SONET SHR. Recently, most of the research on load balancing problem have been concentrated on the SONET single-ring case. However, in certain applications, multiple-ring configuration is necessary because of the geographical limitations or the need for extra bandwidth. In this paper, the load balancing problem for SONET dual-ring is considered by assuming symmetric inter-ring demands. We present a linear programming based formulation of the problem. Initial solution and improvement procedures are presented, which solves the routing and interconnection between the two rings for each demand. Computational experiments are performed on various size of networks with randomly generated demand sets. Results show that the proposed algorithm is excellent in both the solution quality and the computational time requirement. The average error bound of the solutions obtained is 0.26% of the optimum
Design of Survivable Communication Networks with High Connectivity Constraints
No full textDesigning highly survivable interoffice telecommunication networks is considered. The problem is formulated as a minimum-cost network design problem with three node connectivity constraints. These valid and facet-defining inequalities for the convex hull of the solution are presented. A branch and cut algorithm is proposed based on the inequalities to obtain the optimal solution. With the lower bound by the cutting plane algorithm, a delete-ink heuristic is proposed to otain a good upper bound in the branch and bound procedure. The effeciveness of the branch and cut algorithm is demonstrated with computational results for a variety of problem sets : different lower bounds, two types of link costs and large number of links. The cutting plane procedure based on the three inequalities provides excellent lower bounds to the optimal solutions
Minimum energy consumption design of a two-hop relay network for QoS guarantee
No full textIn this paper we consider a two-hop relay network consisting of a source, a destination and multiple relay nodes. For a given quality of service (QoS) requirement such as transmission rate between the source and the destination, relay nodes have an adaptive power control scheme to meet the QoS requirement. The adaptive power control scheme is assumed to be based on the channel condition between relay nodes and the destination. It is then an interesting problem to design an optimal relay network that minimizes total average energy consumption. By considering the details on the operations of the relay selection protocol considered in this paper, we first develop a mathematical model for the relay network and analyze total average energy consumption. Based on our analytic results, we formulate an optimization problem with which we can design an optimal relay network that minimizes total average energy consumption. We provide some numerical examples to investigate the behavior of total average energy consumption of the relay network
Experimental Study of Hybrid Reburning and SNCR Process for NOx Reduction in Various Oxygen Enriched LPG Flame
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EFFECT OF INTERFACIAL TENSIONS ON BEHAVIOR OF TWO-PHASE PLUG FLOW IN ROUND MINI-CHANNELS
Full text linkGas nitriding of an equiatomic TiNi shape memory alloy II. Hardness, wear and shape memory ability
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