检索结果-南通市图书馆

microprocessor based protecting and monitoring system for transformer of electric furnace in nickel smelting process

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2001年第6期11卷 960-964页

作者：廖力清曾可凌玉华杨欣荣陈燕辉 Cent S Univ Coll Informat Sci & Engn Changsha 410083 Peoples R China

In nickel smelting process, the working conditions and surroundings for the transformer of electric furnace are worse than general electric power transformer. It is difficult to meet the requirements on reliability and safety by the conventional centralized control protection. With the development of microcomputer and field bus technology, it is necessary to design a new type of protection and monitoring system for transformer of electric furnace. A microprocessor based protection and monitoring system was described, which uses the embedded high performance microprocessor 87C196KC 20 as its most important micro-controller unit & the technology of CAN (Controller Area Network) making it a fully distributed microcomputer system not only to perform all sorts of the transformer protection and function of automatic coinciding and communicate with the monitoring host, but also to carry with it the function of protecting, measuring, and fault diagnosis for transformer of electric furnace.

关键词： electric furnace transformer microprocessor microcomputer protecting CAN field bus

The investigation on sensitive mapping of memory cell in microprocessor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Semiconductors 2015年第11期36卷 44-47页

作者：于春青范隆岳素格陈茂鑫杜守刚郑宏超 Beijing Microelectronics Technology Institute Beijing University of Aeronautics & Astronautics

The single event effects of the sensitivity of a circuit are investigated on a 32-bit microprocessor with a five-stage instruction pipeline by pulsed laser test. The investigation on sensitive mapping of the memory cell is illustrated and then the comparison between the sensitive mapping and the layout of the circuit is made. A comparison result indicates that the area of the sensitive node in sensitive mapping is just the location of the drain in the layout. Therefore, SEE sensitivity in sensitive mapping fits well with that in the physical layout of functional units, which can directly and objectively indicate the size and distribution of sensitive areas. The investigation of sensitive mapping is a meaningful way to verify the hardened effect and provide a reference for improving hardened design by combining with the physical layout.

关键词： single event effects memory cells microprocessor sensitive mapping

Low cost design of microprocessor EDAC circuit

在线全文

学校读者我要写书评

暂无评论

Journal of Semiconductors 2015年第11期36卷 88-92页

作者：郝丽于立新彭和平庄伟 Beijing Microelectronic Technology Institute

An optimization method of error detection and correction（EDAC） circuit design is proposed. The method involves selecting or constructing EDAC codes of low cost hardware, associated with operation scheduling implementation based on 2-input XOR gates structure, and two actions for reducing hardware cells, which can reduce the delay penalties and area costs of the EDAC circuit effectively. The 32-bit EDAC circuit hardware implementation is selected to make a prototype, based on the 180 nm process. The delay penalties and area costs of the EDAC circuit are evaluated. Results show that the time penalty and area cost of the EDAC circuitries are affected with different parity-check matrices and different hardware implementation for the EDAC codes with the same capability of correction and detection code. This method can be used as a guide for low-cost radiation-hardened microprocessor EDAC circuit design and for more advanced technologies.

关键词： error detection and correction hardware implementation microprocessor single-event upsets

Investigation on microprocessor based waveform control of short circuit transfer CO_2 welding

在线全文

学校读者我要写书评

暂无评论

China Welding 2006年第4期15卷 26-29页

作者：朱锦洪石红信李兴霞刘兆魁涂益民 School of Materials Science and Technology Henan University of Science and Technology Luoyang471003.

A new kind of simple and flexible CO2 welding system was developed to carry out waveform control. The system consisted of IGBT inverter, PWM circuit and microprocessor unit （ MPU） , in which the output current of constant current （CC） power supply could be changed according to transient physical state, and the variable down slope rate control could be used to ensure a stable welding process. The welding experiment results proved the effectiveness of this control approach.

关键词： CO2 welding waveform control microprocessor short circuit transfer

The MMU Implementation of Unity-1 microprocessor

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2003年第4期9卷 27-32页

作者：宋传华 Cheng Xu Zhu Dexin microprocessor Research Center of Peking University Beijing 100871 P.R.China

Virtual memory management is always a very essential issue of the modern microprocessor design. A memory management unit (MMU) is designed to implement a virtual machine for user programs, and provides a management mechanism between the operating system and user programs. This paper analyzes the tradeoffs considered in the MMU design of Unity 11 CPU of Peking University, and introduces in detail the solution of pure hardware table walking with two level page table organization. The implementation takes care of required operations and high performances needed by modern operating systems and low costs needed by embedded systems. This solution has been silicon proven, and successfully porting the Linux 2.4.17 kernel, the XWindow system, GNOME and most application software onto the Unity platform.

关键词： Unity 1 MMU TLB table walking microprocessor

The Automated System of Unified Templates as an Element of Trainability of microprocessor Relay Protection Devices

在线全文

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2021年第12期9卷 3045-3057页

作者： Viktor Nikolaevich Sizykh Aleksey Vasilyevich Daneev Maksim Viktorovich Vostrikov Konstantin Vladimirovich Menaker Irkutsk State Transport University Irkutsk Russia The Transbaikal Institute of Railway Transport Chita Russia

The article discusses the possibility of further modernization of the standard microprocessor relay protection of AC overhead system feeders DPA-27.5-TNF, which is operated on the Trans-Baikal Railway by creating an additional automated system of unified templates necessary for the occurrence of “trainability” elements. The templates will be formed via a separate dedicated channel for transmission, processing and storage of the necessary information, not related to the operation of the terminal, with its subsequent visualization at the workplace of the duty personnel of traction substations, together with information from the “GID” software received via another dedicated wired channel. With the help of such a base of unified preset templates, in the future, it will be possible not only to identify the specific causes of each emergency shutdown but also to reduce their number by dynamically adjusting the existing presets of the standard operation algorithm.

关键词： Automated System microprocessor Relay Protection Devices Feeder Traction Substation

A High Performance and Energy Efficient microprocessor with a Novel Restricted Dynamically Reconfigurable Accelerator

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Circuits and Systems 2017年第5期8卷 134-147页

作者： Itaru Hida Shinya Takamaeda-Yamazaki Masayuki Ikebe Masato Motomura Tetsuya Asai Graduate School of Information Science and Technology Hokkaido University Sapporo Japan

In the era of Internet of Things, the battery life of edge devices must be extended for sensing connection to the Internet. We aim to reduce the power consumption of the microprocessor embedded in such devices by using a novel dynamically reconfigurable accelerator. Conventional microprocessors consume a large amount of power for memory access, in registers, and for the control of the processor itself rather than computation;this decreases the energy efficiency. Dynamically reconfigurable accelerators reduce such redundant power by computing in parallel on reconfigurable switches and processing element arrays (often consisting of an arithmetic logic unit (ALU) and registers). We propose a novel dynamically reconfigurable accelerator “DYNaSTA” composed of a dynamically reconfigurable data path and static ALU arrays. The static ALU arrays process instructions in parallel without registers and improve energy efficiency. The dynamically reconfigurable data path includes registers and many switches dynamically reconfigured to resolve operand dependencies between instructions mapped on the static ALU array, and forwards appropriate operands to the static ALU array. Therefore, the DYNaSTA accelerator has more flexibility while improving the energy efficiency compared with the conventional dynamically reconfigurable accelerators. We simulated the power consumption of the proposed DYNaSTA accelerator and measured the fabricated chip. As a result, the power consumption was reduced by 69% to 86%, and the energy efficiency improved 4.5 to 13 times compared to a general RISC microprocessor.

关键词： Embedded microprocessor Reconfigurable Low-Power Accelerator Digital Circuit Architecture

Comprehensive Automation of microprocessor Protection Relay Terminals Operated on AC Railways

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Physics 2022年第2期10卷 491-503页

作者： Vostrikov Maksim Viktorovich Daneev Aleksey Vasilyevich Menaker Konstantin Vladimirovich Sizykh Viktor Nikolaevich Zabaikalsk Rail Transport Institute A Branch of Irkutsk State Transport University Chita Russia Irkutsk State Transport University Irkutsk Russia

The article discusses the possibility of a potential reduction in the number of operations of microprocessor relay protection of feeders of the contact network of AC railways TsZA-27.5-FKS (FTS) for unknown reasons. Real statistics on the number of microprocessor relay protection operations at the Buryatskaya traction substation are presented, simulation of the real train situation (in accordance with the regime maps of the throughput capacity of the sections of the Trans-Baikal railway) was carried out in the specialized software complex “KORTES”. Based on the results of the analysis of simulation modeling, the process of forming a unified template of settings using neural network technologies is considered, which characterizes only this specific regular train situation. To protect objects in the event of pre-emergency and emergency modes of operation of the traction power supply system, a variant of changing the standard operation algorithm of the TsZA-27.5-FKS (FTS) terminal by introducing additional blocks for calculating the predictive functions of current and voltage has been proposed.

关键词： Automated System microprocessor Relay Protection Devices Feeder Traction Substation

Digital Filter for Electrocardiogram Preprocessing Based on microprocessor

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Biomedical Engineering(English Edition) 2010年第1期19卷 30-34页

作者： WU Xian-wen WANG Feng School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China

This paper proposes a different method to eliminate base wander and power line interference in electrocardiogram, which introduces the integer coefficient filter theory and gives the detail for designing digital filter to remove these two normal noise signals. Signal from the MIT-BIH electrocardiogram database was used to test the performance of the filter. From the test results, the performance of the digital filer is reDT good. The filter coefficient is an integer number, therefore, the filtering algorithm can be successfully implemented on the microprocessor.

关键词： digital filter electrocardiogram microprocessor noise removing MIT-BIH database