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排序方式: 共有137条查询结果,搜索用时 11 毫秒
1.
26 clinician trainees' recollections of experiences in a diagnostic preschool program were analyzed in terms of strength and weaknesses of the program. 相似文献
2.
Semi-insulating <111> ZnTe prepared by In doping during Bridgman growth was found to have a resistivity of 5.74 × 107 ohm-cm, the highest reported so far in ZnTe, with hole concentration of 2.4 × 109/cm3 and hole mobility of 46 cm2 /V.s at 300 K. The optical band gap was 2.06 eV at 293 K compared with 2.26 eV for undoped semiconducting ZnTe. Thermally
stimulated current (TSC) studies revealed 2 trap levels at depths of 202–222 meV and 412–419 meV, respectively. Photoluminescence
(PL) studies at 10 K showed strong peaks at 1.37 eV and 1.03 eV with a weak shoulder at 1.43 eV. Short anneal for 3 min at
250°C led to conversion to a p-type material with resistivity, 14.5 ohm-cm, indicating metastable behaviour. Raman studies
carried out on undoped and In-doped samples showed small but significant differences. Possible models for semi-insulating
behaviour and meta-stability are proposed. 相似文献
3.
Surajit Bhattacharjya Sk Abdul Mohid Anirban Bhunia 《International journal of molecular sciences》2022,23(9)
Global rise of infections and deaths caused by drug-resistant bacterial pathogens are among the unmet medical needs. In an age of drying pipeline of novel antibiotics to treat bacterial infections, antimicrobial peptides (AMPs) are proven to be valid therapeutics modalities. Direct in vivo applications of many AMPs could be challenging; however, works are demonstrating encouraging results for some of them. In this review article, we discussed 3-D structures of potent AMPs e.g., polymyxin, thanatin, MSI, protegrin, OMPTA in complex with bacterial targets and their mode of actions. Studies on human peptide LL37 and de novo-designed peptides are also discussed. We have focused on AMPs which are effective against drug-resistant Gram-negative bacteria. Since treatment options for the infections caused by super bugs of Gram-negative bacteria are now extremely limited. We also summarize some of the pertinent challenges in the field of clinical trials of AMPs. 相似文献
4.
Datta A. Bhunia S. Jung Hwan Choi Mukhopadhyay S. Roy K. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2008,16(7):806-815
In this paper, a profit-aware design metric is proposed to consider the overall merit of a design in terms of power and performance. A statistical design methodology is then developed to improve the economic merit of a design considering frequency binning and product price profile. A low-complexity sensitivity-based gate sizing algorithm is developed to improve economic gain of a design over its initial yield-optimized design. Finally, we present an integrated design methodology for simultaneous sizing and bin boundary determination to enhance profit under an area constraint. Experiments on a set of ISCAS'85 benchmarks show in average 19% improvement in profit for simultaneous sizing and bin boundary determination, considering both leakage power dissipation and delay bounds compared to a design initially optimized for 90% yield at iso-area in 70-nm bulk CMOS technology. 相似文献
5.
Agarwal A. Kunhyuk Kang Bhunia S. Gallagher J.D. Roy K. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2007,15(6):660-671
Dual-Vt design technique has proven to be extremely effective in reducing subthreshold leakage in both active and standby mode of operation of a circuit in submicrometer technologies. However, aggressive scaling of technology results in different leakage components (subthreshold, gate and junction tunneling) to become significant portion of total power dissipation in CMOS circuits. High-Vt devices are expected to have high junction tunneling current (due to stronger halo doping) compared to low-Vt devices, which in the worst case can increase the total leakage in dual-Vt design. Moreover, process parameter variations (and in turn Vt variations) are expected to be significantly high in sub-50-nm technology regime, which can severely affect the yield. In this paper, we propose a device aware simultaneous sizing and dual-Vt design methodology that considers each component of leakage and the impact of process variation (on both delay and leakage power) to minimize the total leakage while ensuring a target yield. Our results show that conventional dual-Vt design can overestimate leakage savings by 36% while incurring 17% average yield loss in 50-nm predictive technology. The proposed scheme results in 10%-20% extra leakage power savings compared to conventional dual-Vt design, while ensuring target yield. This paper also shows that nonscalability of the present way of realizing high-Vt devices results in negligible power savings beyond 25-nm technology. Hence, different dual-Vt process options, such as metal gate work function engineering, are required to realize high-performance and low-leakage dual-Vt designs in future technologies. 相似文献
6.
Raychowdhury A. Paul B.C. Bhunia S. Roy K. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2005,13(11):1213-1224
This paper presents a novel design methodology for ultralow-power design using subthreshold leakage as the operating current (suitable for medium frequency of operation: tens to hundreds of millihertz). Standard design techniques suitable for super-threshold design can be used in the subthreshold region. However, in this study, it has been shown that a complete co-design at all levels of hierarchy (device, circuit, and architecture) is necessary to reduce the overall power consumption while achieving acceptable performance (hundreds of millihertz) in the subthreshold regime of operation. Simulation results of co-design on a five-tap finite-impulse-response filter shows /spl sim/2.5/spl times/ improvement in throughput at iso-power compared to a conventional design. 相似文献
7.
Low-power scan design using first-level supply gating 总被引:5,自引:0,他引:5
Bhunia S. Mahmoodi H. Ghosh D. Mukhopadhyay S. Roy K. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2005,13(3):384-395
Reduction in test power is important to improve battery lifetime in portable electronic devices employing periodic self-test, to increase reliability of testing, and to reduce test cost. In scan-based testing, a significant fraction of total test power is dissipated in the combinational block. In this paper, we present a novel circuit technique to virtually eliminate test power dissipation in combinational logic by masking signal transitions at the logic inputs during scan shifting. We implement the masking effect by inserting an extra supply gating transistor in the supply to ground path for the first-level gates at the outputs of the scan flip-flops. The supply gating transistor is turned off in the scan-in mode, essentially gating the supply. Adding an extra transistor in only one logic level renders significant advantages with respect to area, delay, and power overhead compared to existing methods, which use gating logic at the output of scan flip-flops. Moreover, the proposed gating technique allows a reduction in leakage power by input vector control during scan shifting. Simulation results on ISCAS89 benchmarks show an average improvement of 62% in area overhead, 101% in power overhead (in normal mode), and 94% in delay overhead, compared to the lowest cost existing method. 相似文献
8.
Banerjee N. Raychowdhury A. Roy K. Bhunia S. Mahmoodi H. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》2006,14(9):1034-1039
Power consumption in datapath modules due to redundant switching is an important design concern for high-performance applications. Operand isolation schemes that reduce this redundant switching incur considerable overhead in terms of delay, power, and area. This paper presents novel operand isolation techniques based on supply gating that reduce overheads associated with isolating circuitry. The proposed schemes also target leakage minimization and additional operand isolation at the internal logic of datapath to further reduce power consumption. We integrate the proposed techniques and power/delay models to develop a synthesis flow for low-power datapath synthesis. Simulation results show that the proposed operand isolation techniques achieve at least 40% reduction in power consumption compared to original circuit with minimal area overhead (5%) and delay penalty (0.15%) 相似文献
9.
Iranian Polymer Journal - This work aims at modelling and characterizing the kinetics of biodegradation of acrylic acid-grafted polypropylene. Different films of acrylic acid-grafted polypropylene... 相似文献
10.
Analysis of Fatty Acid and Lignan Composition of Indian Germplasm of Sesame to Evaluate Their Nutritional Merits 下载免费PDF全文
Rupam Kumar Bhunia Anirban Chakraborty Ranjeet Kaur T. Gayatri K. V. Bhat Asitava Basu Mrinal K. Maiti Soumitra Kumar Sen 《Journal of the American Oil Chemists' Society》2015,92(1):65-76
An attempt was made to individually analyze a germplasm collection of 54 indigenous Indian sesame cultivars for fatty acid and lignan composition of their seed oil by gas chromatography and high performance liquid chromatography, respectively. The entries varied in their fatty acid and lignan composition. The mean percentage contents of palmitic, stearic, oleic, linoleic and α‐linolenic acids ranged between 10–22, 5–10, 38–50, 18–43 and less than 1 whereas sesamol, sesamin and sesamolin scored between 3–37, 27–67, 20–59 of the total percentage of lignan, respectively. The highest percentage of α‐linolenic acid (ALA) was obtained in Var‐9 (1.3 % of the total fatty acids). Among the lignans, high sesamin content is considered to be significant, particularly in terms of long shelf life and nutraceutical value of sesame seed oil. The study has broadened our understanding related to differential biochemical composition of the rich sesame germplasms, thereby providing us with a useful groundwork for identifying potential targets and suitable cultivars for genetic engineering approaches to be undertaken in order to improve the nutritional quality of sesame oil, which in turn would be beneficial towards human health. 相似文献