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Mohiuddin, M.,Sexton, J.,Missous, M. The Institute of Electronics and Information Engin 2013 Journal of semiconductor technology and science Vol.13 No.5
This paper investigates the two dominant but intertwined current blocking mechanisms of Switching and Kirk Effect in pure ternary InAlAs/InGaAs/InAlAs Double Heterojunction Bipolar Transistors (DHBTs). Molecular Beam Epitaxy (MBE) grown, lattice-matched samples have been investigated giving substantial experimental results and theoretical reasoning to explain the interplay between these two effects as the current density is increased up to and beyond the theoretical Kirk Effect limit for devices of emitter areas varying from $20{\times}20{\mu}m^2$ to $1{\times}5{\mu}m^2$. Pure ternary InAlAs/InGaAs/InAlAs DHBTs are ideally suited for such investigations because, unless corrective measures are taken, these devices suffer from appreciable current blocking effect due to their large conduction band discontinuity of 0.5 eV and thus facilitating the observation of the two different physical phenomena. This enhanced understanding of the interplay between the Kirk and Switching effect makes the DHBT device design and optimization process more effective and efficient.
M. Mohiuddin,J. Sexton,M. Missous 대한전자공학회 2013 Journal of semiconductor technology and science Vol.13 No.5
This paper investigates the two dominant but intertwined current blocking mechanisms of Switching and Kirk Effect in pure ternary InAlAs/InGaAs/InAlAs Double Heterojunction Bipolar Transistors (DHBTs). Molecular Beam Epitaxy (MBE) grown, lattice-matched samples have been investigated giving substantial experimental results and theoretical reasoning to explain the interplay between these two effects as the current density is increased up to and beyond the theoretical Kirk Effect limit for devices of emitter areas varying from 20x20 μm² to 1x5 μm². Pure ternary InAlAs/InGaAs/InAlAs DHBTs are ideally suited for such investigations because, unless corrective measures are taken, these devices suffer from appreciable current blocking effect due to their large conduction band discontinuity of 0.5 eV and thus facilitating the observation of the two different physical phenomena. This enhanced understanding of the interplay between the Kirk and Switching effect makes the DHBT device design and optimization process more effective and efficient.
Philip K. Louie,Andrew C. Sexton,Danel D. Bohl,Ehsan Tabaraee,Steven M. Presciutti,Benjamin C. Mayo,Justin C. Paul,Comron Saifi,Howard S. An 대한척추신경외과학회 2020 Neurospine Vol.17 No.1
Objective: To determine the risk factors associated with radiographic changes and clinical outcomes following 3-level anterior cervical discectomy and fusion (ACDF) using rigidplate constructs and cortico-cancellous allograft. ACDF has demonstrated efficacy for treatment of multilevel degenerative cervical conditions, but current data exists in small heterogeneous forms. Methods: A retrospective review included 98 patients with primary 3-level ACDF surgery at one institution from 2008 to 2013 with minimum 1-year follow-up. Cervical sagittal vertical axis (SVA), segmental height, fusion, and lordosis radiographs were measured preoperatively and at 2 postoperative periods. Results: Rates of asymptomatic pseudarthroses and total reoperations were 18% and 4%, respectively. Results demonstrated immediate improvements in cervical lordosis (5.5°, p<0.01) and segmental height (5.0-mm increase, p<0.01) with little changes in the cervical SVA (3.2-mm increase, p<0.01). The segmental height decreased from immediate postoperative period to final follow-up (1.7-mm decrease, p<0.01). Older age was protective against radiolucent lines (p<0.05). Patient-reported outcomes significantly improved following surgery (p<0.01). Current smoking status and diagnosis of diabetes mellitus had no impact on radiographic or clinical outcomes. Risk factors were not identified for the 5 reoperations (4%). Conclusion: Three-level ACDF with rigid-plating and cortico-cancellous allograft is an effective procedure for degenerative diseases of the cervical spine without the application of additional adjuncts or combined anteriorposterior cervical surgeries. Significant improvements in cervical lordosis, segmental height, and segmental alignment can be achieved with little change in cervical SVA and a low rate of reoperations over short-term follow-up. Similarly, patient-reported outcomes show significant improvements.
Effect of lubricant solvent system on the electrical properties of silver filled polymers
McNeilly, Kirk,Jost, Ernest M.,Sexton, Peter 한국마이크로전자및패키징학회 1994 Seminar on Hybrid Microelectronics and Multichip P Vol.1 No.1
Silver flakes were produced with similar physical properties by milling precipitated silver powder with various lubricant-solvent systems. Lubricant solvent systems included those widely used: oleic acid/ethanol, stearic acid/kerosene and soap/water as well as other functional groups/solvent combinations. canning electron microscopy was used to confirm the flakes were essentially the same in particle size and particle size distribution. Measurements of the volume resistivity of these silver flakes were made in various epoxies.
HELIUM3D: A Laser-scanning Head-tracked Autostereoscopic Display
Brar, Rajwinder Singh,Surman, Phil,Sexton, Ian,Hopf, Klaus The Korean Infomation Display Society 2010 Journal of information display Vol.11 No.3
A multi-user autostereoscopic display based on laser scanning is described in this paper. It does not require the wearing of special glasses; it can provide 3D to several viewers who have a large degree of freedom of movement; and it requires the display of only a minimum amount of information. The display operates by providing regions in the viewing field, referred to as "exit pupils," which follow the positions of the viewers' eyes under the control of a multi-user head tracker. The display incorporates an RGB laser illumination source that illuminates a light engine. The light directions are controlled by a spatial light modulator, and a front screen assembly incorporates a novel Gabor superlens. Its operating principle is explained in this paper, as is the construction of three iterations of the display. Finally, a method of developing the display into one that is suitable for television applications is described.
A Time-multiplexed 3d Display Using Steered Exit Pupils
Brar, Rajwinder Singh,Surman, Phil,Sexton, Ian,Hopf, Klaus The Korean Infomation Display Society 2010 Journal of information display Vol.11 No.2
This paper presents the multi-user autostereoscopic 3D display system constructed and operated by the authors using the time-multiplexing approach. This prototype has three main advantages over the previous versions developed by the authors: its hardware was simplified as only one optical array is used to create viewing regions in space, a lenticular multiplexing screen is not necessary as images can be produced sequentially on a fast 120Hz LCD with full resolution, and the holographic projector was replaced with a high-frame-rate digital micromirror device (DMD) projector. The whole system in this prototype consists of four major parts: a 120Hz high-frame-rate DMD projector, a 49-element optical array, a 120Hz screen assembly, and a multi-user head tracker. The display images for the left/right eyes are produced alternatively on a 120Hz direct-view LCD and are synchronized with the output of the projector, which acts as a backlight of the LCD. The novel steering optics controlled by the multiuser head tracker system directs the projector output to regions referred to as exit pupils, which are located in the viewers’eyes. The display can be developed in the "hang-on-the-wall"form.