检索结果-内蒙古大学图书馆

IEEE SPECTRUM 1992年第3期29卷 36-39页

作者： CLARK, TR Data IO Corporation USA

Synthesis software for user-programmable logic that relieves designers of complex design fitting, placement, and routing is examined. The program, called a device fitter, manipulates a designer's generic logic description until the best possible fit with a particular field programmable gate array (FPGA) or complex programmable logic device (PLD) is obtained. The characteristics of the newer FPGAs and PLDs, for which the software is intended, are described.< >

关键词： programmable logic arrays programmable logic devices logic devices Field programmable gate arrays logic design Routing

来源：评论

学校读者我要写书评

暂无评论

Ironing out Their Differences: Dissecting the Structural Determinants of a Phenylalanine Aminomutase and Ammonia Lyase

引用

ACS CHEMICAL BIOLOGY 2015年第4期10卷 989-997页

作者： Heberling, Matthew M. Masman, Marcelo F. Bartsch, Sebastian Wybenga, Gjalt G. Dijkstra, Bauke W. Marrink, Siewert J. Janssen, Dick B. Univ Groningen Groningen Biomol Sci & Biotechnol Inst Dept Biochem NL-9747 AG Groningen Netherlands Univ Groningen Groningen Biomol Sci & Biotechnol Inst Biophys Chem Lab NL-9747 AG Groningen Netherlands Univ Groningen Groningen Biomol Sci & Biotechnol Inst Dept Mol Dynam NL-9747 AG Groningen Netherlands

Deciphering the structural features that functionally separate ammonia lyases from aminomutases is of interest because it may allow for the engineering of more efficient aminomutases for the synthesis of unnatural amino acids (e.g., beta-amino acids). However, this has proved to be a major challenge that involves understanding the factors that influence their activity and regioselectivity differences. Herein, we report evidence of a structural determinant that dictates the activity differences between a phenylalanine ammonia lyase (PAL) and aminomutase (PAM). An inner loop region that closes the active sites of both PAM and PAL was mutated within PAM (PAM residues 77-97) in a stepwise approach to study the effects when the equivalent residue(s) found in the PAL loop were introduced into the PAM loop. Almost all of the single loop mutations triggered a lyase phenotype in PAM. Experimental and computational evidence suggest that the induced lyase features result from inner loop mobility enhancements, which are possibly caused by a 3(10)-helix cluster, flanking a-helices, and hydrophobic interactions. These findings pinpoint the inner loop as a structural determinant of the lyase and mutase activities of PAM.

关键词： pralidoxime iodide SHCBP1 gene programmable logic arrays Determinants internal recycling Lyases LRIT1 gene Ironing Ammonia-Lyases

来源：评论

学校读者我要写书评

暂无评论

EFFICIENCY AND PERFORMANCE COMPARISON OF DIFFERENT DESIGN METHODOLOGIES FOR CONTROL PARTS OF MICROPROCESSORS

MICROPROCESSING AND MICROPROGRAMMING

引用

MICROPROCESSING AND MICROPROGRAMMING 1982年第2-3期10卷 163-178页

作者： OBREBSKA, M Computer Architecture Group IMAG BP 53x 38041 Grenoble cédex France

We present here several basic methodologies used in the design of control parts of microprocessors and discuss their classification with respect to the qualities of their design. All these different methodologies are brought out by decoding existing integrated circuits. Afterwards each one of these methodologies was used to redesign a new control part for the MC 6800 microprocessor, its operation part remaining unchanged. In this way, we obtained a set of normalized solutions so that the real efficiency of each method could be estimated in terms of the cost of hardware and design time. The performance expressed by the cycle time of each control part was also calculated leading to the complete, valid classification of different design styles. Lastly, the evolution of the design efficiency versus the circuit complexity was studied.

关键词： Interpretation algorithm levels of interpretation control part design microprogramming programmable logic arrays efficiency evaluation regularity factor speed factor algorithm complexity

来源：评论

学校读者我要写书评

暂无评论

A HIGHLY AUTOMATED SEMI-CUSTOM APPROACH FOR VLSI

引用

IEEE JOURNAL OF SOLID-STATE CIRCUITS 1982年第3期17卷 465-472页

作者： BAUGE, M RICHARME, M VERGNIERES, B Component Development Laboratory IBM Corbeil-Essonnes France

The structured approach is aimed at optimizing the chip physical design while keeping design resources and time at a reasonable level. The logic is partitioned into data flow logic and control logic; a specialized physical structure has been defined to match the data flow logic structure and the gate array has been chosen for control logic implementation, both physical structures being customizable. A general purpose library and a set of design automation programs have been developed to allow fast physical design of the functional partitions according to the applications. A bipolar 16-bit slice microprocessor has been designed with this approach and built; compared to the widely used gate array chip implementation, it shows an improvement of 2 in gate density and 1.5 in power dissipation. The physical design of this 2000 gates chip took only two months.

关键词： Very large scale integration logic arrays programmable logic arrays Automatic control Libraries Microprocessors Wiring logic design Design automation Integrated circuit interconnections

来源：评论

学校读者我要写书评

暂无评论

Near-Field Leaky-Wave Focusing Antenna With Tapered Dielectric Constant Distribution

引用

IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS 2023年第5期22卷 1209-1213页

作者： Mutai, Kevin Kipruto Sato, Hiroyasu Chen, Qiang Tohoku Univ Grad Sch Engn Dept Commun Engn Sendai 9808579 Japan

In this letter, a leaky-wave focusing antenna with a tapered dielectric constant distribution is introduced. The main appeal of the structure is the simplicity and low cost by which the tapering is achieved in the fabrication process where the required effective dielectric constant profile is actualized by three-dimensional printing in less than an hour using the commonly available and inexpensive polylactic acid material. A detailed design method of the structure is presented and the desired focusing effect demonstrated by both simulation and experimental results at Ku-band.

关键词： Focusing Dielectric constant Antennas Three-dimensional printing Rectangular waveguides Three-dimensional displays programmable logic arrays 3-D printing additive manufacturing (AM) antenna synthesis focusing leaky-wave antennas (LWAs)

来源：评论

学校读者我要写书评

暂无评论

Configurable computing: Technology and applications

引用

COMPUTER 2000年第4期33卷 39-40页

作者： Vemuri, RR Harr, RE Univ Cincinnati Dept Elect & Comp Engn Cincinnati OH 45221 USA Synopsys Inc Adv Technol Grp Mt View CA 94043 USA

Early configurable, custom-computing machines, although successful, had long reconfiguration times and rather inflexible board-level architectures. Advances in VLSI have led to coarse-grained reconfigurable data paths, which outperform traditional instruction-set processors on various *** idea of realizing configurable custom-computing engines using reconfigurable hardware building blocks has been around since at least the 1960s. However, the first practical demonstrations of such engines came in the late 1980s, thanks to the advent of in-circuit reprogrammable devices such as field-programmable gate arrays. (In this article, "FPGAs" refer to complex programmable logic devices, FPGAs, field-programmable logic arrays, and their variants.) FPGAs provide fine-grained logic and interconnection elements whose function and structure users can program to suit an application's needs.

关键词： Computer applications Computer architecture Field programmable gate arrays programmable logic arrays Concurrent computing logic devices Acceleration Program processors Very large scale integration Application software

来源：评论

学校读者我要写书评

暂无评论

AN INTELLIGENT VME-BASED CAMAC CRATE CONTROLLER

引用

IEEE TRANSACTIONS ON NUCLEAR SCIENCE 1987年第4期34卷 1033-1035页

作者： SCHEETZ, RA LEVINE, MJ Physics Department Brockhaven National Laboratory Upton NY USA

A VME-resident Camac crate controller is described which maps all Camac functions into the address space of a 68000 microprocessor. The controller also contains a VME bus requester, thus allowing it to contribute Cama... 详细信息

关键词： CAMAC Microprocessors programmable logic arrays Control systems Prototypes logic devices programmable logic devices Circuits Signal generators Physics

来源：评论

学校读者我要写书评

暂无评论

A LOW-POWER MEMORY SYSTEM FOR PULSE-HEIGHT-ANALYZER SYSTEMS

引用

IEEE TRANSACTIONS ON NUCLEAR SCIENCE 1970年第1期NS17卷 102-+页

作者： HARRINGTON, TM MARSHALL, H Analog Technology Corporation Pasadena CA USA

This paper describes the design techniques used in producing two magnetic-core memories for space-flight applications. The design stresses low power, dense packaging and wide operating temperature range. Data showing secure operation for temperatures between -50° C and +80°C are presented. Typical power consumption exclusive of programming logic for a 1024 × 8-bit core array is 57 mW plus 9.8 μJ per readwrite cycle and for a 4096 × 10-bit array is 72 mW plus 12.8 μJ per cycle. The 4096 × 10-bit array has been assembled as a dual-cycle 2048 × 20-bit memory and packaged using soldered cordwood modules. The time required for a single read-add-one-write cycle is 4 μs.

关键词： Magnetic cores Saturation magnetization Toroidal magnetic fields programmable logic arrays Magnetic flux Packaging Space technology Temperature distribution logic programming Assembly

来源：评论

学校读者我要写书评

暂无评论

Energy expenditure and physical activity of ambulatory children with cerebral palsy and of typically developing children

引用

AMERICAN JOURNAL OF CLINICAL NUTRITION 2010年第2期92卷 313-319页

作者： Bell, Kristie L. Davies, Peter S. W. Univ Queensland Sch Med Queensland Cerebral Palsy & Rehabil Res Ctr Brisbane Qld 4072 Australia Univ Queensland Sch Med Childrens Nutr Res Ctr Brisbane Qld 4072 Australia Royal Childrens Hosp Dept Paediat Rehabil Brisbane Qld Australia

Background: Children with cerebral palsy (CP) expend more energy when walking than do their typically developing peers. The effect this has on physical activity levels (PALs) and on total energy expenditure (TEE) will have important implications when determining energy requirements. Objectives: This study aimed to investigate the components of TEE in children with CP in comparison with typically developing children and to determine what effect the higher energy expenditure during walking has in ambulatory children with CP on PAL and on TEE. Design: Sixteen children with mild CP and 16 typically developing children, aged 5-12 y, were recruited for the study. Resting energy expenditure (REE) and the energy expenditure during walking were measured by using indirect calorimetry. TEE was determined by using the doubly labeled water technique. PAL was calculated as the ratio of TEE to REE. Body composition was estimated by using oxygen-18. Results: TEE was lower in children with CP (7012 +/- 1268 kJ/d) than in typically developing children (8309 +/- 2088 kJ/d) because of a lower PAL (1.57 +/- 0.23 compared with 1.79 +/- 0.26). The children with CP expended significantly more energy when walking than did the typically developing children (13.8 +/- 4.9 compared with 10.3 +/- 2.3 kJ/min) while walking at a lower velocity (61 +/- 10 compared with 72 +/- 8 m/min). Correlations between energy expenditure during walking and PAL were not statistically significant for either group. Conclusions: Children with CP expend more energy during walking and have a lower PAL and lower energy requirements than do typically developing children. This has important implications when estimating the energy requirements of children with CP. Am J Clin Nutr 2010;92: 313-9.

关键词： SHCBP1 gene programmable logic arrays doubly labeled water technique walking Cerebral Palsy LRIT1 gene Energy Expenditure Motor Activity Child

来源：评论

学校读者我要写书评

暂无评论

Expression of a phenylalanine ammonia-lyase gene in relation to aril breakdown in harvested longan fruit

引用

JOURNAL OF HORTICULTURAL SCIENCE & BIOTECHNOLOGY 2009年第5期84卷 553-559页

作者： Ou, Min Xiao, Ruo Chen, Jian-Ye Lin, He-Tong Duan, Xue-Wu Jiang, Yue-Ming Lu, Wang-Jin S China Agr Univ Coll Hort Sci Guangdong Key Lab Postharvest Sci Guangzhou 510642 Guangdong Peoples R China Fujian Agr & Forestry Univ Coll Food Sci Fuzhou 350002 Peoples R China Chinese Acad Sci S China Bot Garden Guangzhou 510650 Guangdong Peoples R China

A full-length phenylalanine ammonia-lyase gene (PAL) cDNA, named DlPAL1, was isolated and characterised from harvested longan fruit. The expression pattern of DlPAL1 and PAL activities in relation to aril breakdown in longan fruit stored at different temperatures were investigated. The results showed that both PAL activity and the accumulation of DlPAL1 mRNA increased during storage at 25 degrees C and at 10 degrees C, which coincided with an increase in the aril breakdown index (ABI). The increase in PAL activity or in the accumulation of DlPAL1 mRNA coincided with the increase in ABI in fruit stored at 4 degrees C for 40 d, then transferred to 25 degrees C for 2 d. No accumulation of DlPAL1 mRNA throughout storage at 4 degrees C could be detected, although the increase in PAL activity was in accordance with the increase in ABI. Furthermore, changes in DlPAL1 mRNA accumulation were not fully in accordance with the changes observed in PAL activity, and a rapid increase in PAL activity in arils was observed as aril breakdown occurred rapidly whether fruit were stored at 25 degrees C, 4 degrees C, or 10 degrees C, or moved from 4 degrees C to 25 degrees C. These results suggested that PAL activity is closely involved in aril breakdown in longan fruit, and that PAL activity might be regulated at the post-transcriptional level during aril breakdown.

关键词： cold storage enzyme activity enzymes fruits gene expression genes longans messenger RNA phenylalanine ammonia-lyase temperature Dimocarpus longan SHCBP1 gene Lyase Gene programmable logic arrays Genes Phenylalanine Ammonia-Lyase LRIT1 gene Cold storage Fruit Dimocarpus longan Berries Messenger RNA Breakdown

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：