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11.
Wen-Kuan Yeh Wen-Han Wang Yean-Kuen Fang Mao-Chieh Chen Fu-Liang Yang 《Electron Devices, IEEE Transactions on》2002,49(12):2157-2162
Hot-carrier-induced degradation of partially depleted SOI CMOSFETs was investigated with respect to body-contact (BC-SOI) and floating-body (FB-SOI) for channel lengths ranging from 0.25 down to 0.1 /spl mu/m with 2 nm gate oxide. It is found that the valence-band electron tunneling is the main factor of device degradation for the SOI CMOSFET. In the FB-SOI nMOSFET, both the floating body effect (FBE) and the parasitic bipolar transistor effect (PBT) affect the hot-carrier-induced degradation of device characteristics. Without apparent FBE on pMOSFET, the worst hot-carrier stress condition of the 0.1 /spl mu/m FB-SOI pMOSFET is similar to that of the 0.1 /spl mu/m BC-SOI pMOSFET. 相似文献
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Jing-Shun Huang Chen-Yu Chou Meng-Yueh Liu Kao-Hua Tsai Wen-Han Lin Ching-Fuh Lin 《Organic Electronics》2009,10(6):1060-1065
Solution-processed vanadium oxide (V2O5) as an anode interlayer is introduced between the organic layer and the Ag electrode for improving the performance of the low-cost inverted polymer solar cells hybridized with ZnO nanorods. Our investigations indicate that the solution-processed V2O5 interlayer as an electron-blocking layer can effectively prevent the leakage current at the organic/Ag interface. The power conversion efficiency is improved from 2.5% to 3.56% by the introduction of the V2O5 interlayer. The V2O5 interlayer also serves as an optical spacer to enhance light absorption, and thereby increases the photocurrent. Compared to the vacuum-deposited techniques, the fabrication of the solution-processed V2O5 interlayer is simple and effective. The solution-based approach makes it attractive for applications to mass production and potentially printed organic electronics. 相似文献
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Wen-Kuan Yeh Wen-Han Wang Yean-Kuen Fang Fu-Liang Yang 《Electron Device Letters, IEEE》2002,23(7):425-427
This letter investigates hot-carrier-induced degradation on 0.1 μm partially depleted silicon-on-insulator (SOI) nMOSFETs at various ambient temperatures. The thermal impact on device degradation was investigated with respect to body-contact nMOSFETs (BC-SOI) and floating-body SOI nMOSFETs (FB-SOI). Experimental results show that hot-carrier-induced degradation on drive capacity of FB-SOI devices exhibits inverse temperature dependence compared to that of BC-SOI devices. This is attributed to the floating-body effect (FBE) and parasitic bipolar transistor (PBT) effect 相似文献
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A novel etch-diffusion process is developed for fabricating high-aspect-ratio Si structures for microsensors. This is accomplished by first dry etching narrow gap Si microstructures using an electron cyclotron resonance (ECR) source, followed by a shallow B diffusion to fully convert the etched microstructures to p++ layer. Microstructures up to 40 μm deep with 2-μm-wide gaps were etched with a Cl2 plasma generated using the ECR source. Vertical profile and smooth morphology were obtained at low pressure. A shallow B diffusion at 1175°C for 5.5 h. was then carried out to convert the 40-μm-thick resonant elements to p++ layer. A second dry etching step was used to remove the thin p++ layer around the bottom of the resonant elements, followed by bonding to glass and selective wet etch. Released high-aspect-ratio Si microsensors with thicknesses of 35 μm have been demonstrated. At atmospheric pressure, only 5 Vdc driving voltage is needed for 2.5 μm vibration amplitude, which is less than the 10 Vdc required to drive 12-μm-thick resonators fabricated by conventional dissolved wafer process 相似文献
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Wen-Han Qian 《Computer Aided Geometric Design》2011,28(4):257-269
So far, the four-arc approximations to an ellipse E are made under the condition that the major and minor axes keep strictly unchanged. In general, however, this condition is unnecessary. Then the fitting can be further improved. Considering a representative quadrant of E, we first draw two auxiliary circular arcs tangent to E at the axes but having a gap ε at their boundary, such that the small arc S lies outside the large arc L. Meanwhile the extreme errors of S and L w.r.t. E are ε and −ε respectively. Giving the radii of S and L a decrement −ε/2 and an increment ε/2 brings them to join smoothly. Thus, reducing the overall error to minimum, an analytic solution in implicit form is derived. 相似文献
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Hou-Qing Long Wen-Han Xie Wen-Li Chen Wen-Lin Xie Jing-Hui Xu Yong Hu 《International journal of molecular sciences》2014,15(7):12061-12073
Neurological degeneration can occur after compression of the spinal cord. It is widely accepted that spinal cord compression leads to ischemic lesions and ultimately neurological dysfunction due to a narrowed spinal canal. Therefore, an in-depth understanding of the pathogenesis of spinal cord compression injury is required to help develop effective clinical interventions. In the present study, we propose a new method of quantitative 3D micro-CT to observe microvascular events in a chronic spinal cord compression rat model. A total of 36 rats were divided into two groups: sham control group (n = 12) and compressive spinal cord injury group (n = 24). Rats were scarified at four weeks after surgery. In each group, CD34 micro-vessel immunohistochemical staining was performed in half of the animals, while micro-CT scanning was performed in the other half. Microvessel density (MVD) was measured after immunohistochemical staining, while the vascular index (VI) was measured in 3D micro-CT. In comparison with sham control, abnormal somatosensory evoked potentials (SEP) can be seen in all 24 cases of the compression group, and VI shows the amount of microvessels reduced consistently and significantly (p < 0.01). A significant correlation is also found between MVD and VI (r = 0.95, p < 0.01). These data suggest that quantitative 3D micro-CT is a sensitive and promising tool for investigating microvascular changes during chronic compressive spinal cord injury. 相似文献
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Wen-Han Feng Yong-Chieh Chang Yi-Hsiung Lin Hsiao-Ling Chen Hsiu-Mei Chang Chih-Sheng Chu 《International journal of molecular sciences》2022,23(9)
Increasing evidence has shown P2Y12 inhibitor monotherapy is a feasible alternative treatment for patients after percutaneous coronary intervention (PCI) with stent implantation in the modern era. However, patients with diabetes mellitus (DM) have a higher risk of ischemic events and more complex coronary artery disease. The purpose of this study is to evaluate the efficacy and safety of this novel approach among patients with DM and those without DM. We conducted a systematic review and meta-analysis of randomized controlled trials that compared P2Y12 inhibitor monotherapy with 12 months of dual antiplatelet therapy (DAPT) in patients who underwent PCI with stent implantation. PubMed, Embase, Cochrane library database, ClinicalTrials.gov, and three other websites were searched for our data from the earliest report to January 2022. The primary efficacy outcome was major adverse cardiovascular and cerebrovascular events (MACCE): a composite of all-cause mortality, myocardial infarction, stent thrombosis, and stroke. The primary safety outcome was major or minor bleeding events. The secondary endpoint was net adverse clinical events (NACE) which are defined as a composite of major bleeding and adverse cardiac and cerebrovascular events. A total of four randomized controlled trials with 29,136 patients were included in our meta-analysis. The quantitative analysis showed a significant reduction in major or minor bleeding events in patients treated with P2Y12 inhibitor monotherapy compared to standard DAPT (OR: 0.68, 95% CI: 0.46–0.99, p = 0.04) without increasing the risk of MACCE (OR: 0.96, 95% CI: 0.85–1.09, p = 0.50). The number of NACE was significantly lower in the patients treated with P2Y12 inhibitor monotherapy (OR: 0.84, 95% CI: 0.72–0.97, p = 0.019). In DM patients, P2Y12 inhibitor monotherapy was associated with a lower risk of MACCE compared to standard DAPT (OR: 0.85, 95% CI: 0.74–0.98, p = 0.02). Furthermore, P2Y12 inhibitor monotherapy was accompanied by a favorable reduction in major or minor bleeding events (OR: 0.80, 95% CI: 0.64–1.05, p = 0.107). In non-DM patients, P2Y12 inhibitor monotherapy showed a significant reduction in major or minor bleeding events (OR: 0.58, 95% CI: 0.38–0.88, p = 0.01), but without increasing the risk of MACCE (OR: 0.99, 95% CI: 0.82–1.19, p = 0.89). Based on these findings, P2Y12 inhibitor monotherapy could significantly decrease bleeding events without increasing the risk of stent thrombosis or myocardial infarction in the general population. The benefit of reducing bleeding events was much more significant in non-DM patients than in DM patients. Surprisingly, P2Y12 inhibitor monotherapy could lower the risk of MACCE in DM patients. Our study supports that P2Y12 inhibitor monotherapy is a promising alternative choice of medical treatment for patients with DM undergoing PCI with stent implantation in the modern era. 相似文献
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Bing-Ran Zuo Wen-Han Qian 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》2000,30(1):185-192
A general dynamic force distribution (DFD) algorithm for multifingered grasping is presented. Based on the convexity and cone property of contact constraints, the optimal internal force is defined. Determination of the contact force is divided into two phases: (1) determine the direction of the optimal internal force during grasp planning and (2) determine the manipulation force and compensation factor during task manipulation. The total computation cost consists of off-line numerical iterations and on-line analytical computations. Only the latter is related to the real-time control. The algorithm can directly deal with the nonlinear and/or coupled constraints and well overcome the temporal discontinuity. 相似文献
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