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ObjectiveTo investigate the safety and feasibility of self-retaining bidirectional barbed absorbable suture application in retroperitoneoscopic partial nephrectomy.Materials and MethodsFrom Sep 2011 and Aug 2012, 76 cases of retroperitoneoscopic partial nephrectomy were performed at our hospital. The patients were divided into two groups: self-retaining barbed suture (SRBS) group (n = 36) and non-SRBS group (n = 40). There was no significant difference in age, sex, tumor size and location between the two groups. Clinical data and outcomes were analyzed retrospectively.ResultsAll 76 cases of retroperitoneoscopic partial nephrectomy were successfully performed, without conversion to open surgery or serious intraoperative complications. In the SRBS group, the suture time, warm ischemia time and operation blood loss were significantly shorter than that of non-SRBS group (p < 0.01), and operation time and hospital stay were shorter than that of non-SRBS group (p < 0.05).ConclusionsThe application of self-retaining bidirectional barbed absorbable suture in retroperitoneoscopic partial nephrectomy could shorten suture time and warm ischemia time, with good safety and feasibility, worthy of being used in clinic.

The fast-moving target can cause one-dimension range profile aberration, evidence impacts on movement compensation and the performance of imaging algorithm, so in this paper, by analysis of the wideband echo signal model of fast-moving target, then wavelets transform method which can with well capability on low SNR compared with appeared algorithm is proposed to compensate the influence of high speed moving. Computer simulation shows the proposed method can compensate the range profile aberration of fast-moving target effectively

In this paper, a novel hybrid optimization method to solve the phasor measurement unit (PMU) placement problem is presented. The optimal PMU placement (OPP) problem is formulated to guarantee both full observability of the network and minimal number of PMUs. In the hybrid optimization method, the mechanism of simulated annealing (SA) is involved into original particle swarm optimization (PSO) to prevent the method from premature convergence; crossover and mutation operators are applied to increase the diversity of swarm. The proposed method keeps the advantage of PSO to find the optimum result quickly, and is still simple to implement, and can further improve the ability of jumping out of local optimum results. Simulation results on several IEEE systems show the effectiveness of the method. (5 pages)

In order to grapple with the continuously increasing demand on the multimedia traffic over high speed wireless LAN, we need a QoS-oriented MAC for wireless multimedia system. In this thesis, we propose a efficient centralized scheduled access MAC approach in IEEE 802.11 to satisfy multimedia traffic. There are two main algorithms to achieve the goal, queue management algorithm for downlink and uplink to satisfy video traffic's high bandwidth requirement, polling list management method enhance the efficiency of the polling scheme for transmitting voice traffic. The result shows that the centralized scheduled access MAC approach we propose has excellent efficient and compelling performance.

Using high performance merged complementary BiCMOS circuit structure, a 2 K-gate BiCMOS gate array master slice and its unit cell library have been designed and created by 2 /spl mu/m rules. On this master slice, a double 64 bits high speed shift register has also been customized. An internal gate delay of the gate array is 0.65 ns (typical). The operating frequency of the custom IC is more than 100 MHz.

The gain characterization of photonic crystal fiber amplifier is theoretically and experimentally studied by using reverse pumping technique. The gain curves for different pumping powers and different signal lights are obtained experimentally. When the power of the probe light is 6W and the pump power is 160W，the output power up to 104W，has been achieved eventually. It is found in the experiment that when the pump power is increased over a certain value，the output of the amplifier evolves into the unstable state，which in turn degrades the system performance.

The phase-locking of two photonic crystal fiber (PCF) lasers is studied experimentally by using Michelson cavity technique, and 47 W coherent output power is obtained. The phenomenon of interference-enhancement and interference-loss on the two arms of the Michelson cavity is theoretically explained by analyzing the optical path difference. Experiment shows that the Michelson cavity setup can improve the spectra of the combined laser significantly. The bandwidth of the combined laser is less than 5nm in our experiment.

We report here a diode pumped Nd∶YVO4 laser emitting at 1342 and 671nm.A maximum output power of 1.75W at 1342nm was obtained under an incident pump power of 5.45W,with an optical-to-optical conversion efficiency of up to 32.1%.With a type Ⅰ noncritically phase-matched LBO crystal as the intracavity frequency doubler,over 500mW of 671nm light was obtained at 6W of incident pump power,the optical-optical conversion efficiency being 8.3%.The output power fluctuates less than 5% while the temperature change of the LBO crystal oven was maintained ±0.5℃ at the phase-matched temperature.