摘要 :
A pipelined RISC architecture can be bifurcated in to five different stages, namely Instruction fetch, Instruction Decode, Execution, Memory and Write back. All of these stages work in a synchronous manner with each other and forw...
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A pipelined RISC architecture can be bifurcated in to five different stages, namely Instruction fetch, Instruction Decode, Execution, Memory and Write back. All of these stages work in a synchronous manner with each other and forward instructions to the next consecutive stage with each passing cycle. Each incoming instruction will first enter the Instruction fetch stage. Then it will be evaluated and carried to the final Write back stage, where its value is updated in the general purpose register set. Problem arises when consecutive instructions in the pipeline have data dependencies and the succeeding instruction does not get the correct value. As the value required by the succeeding instruction is being evaluated in the preceding instruction and is not been updated in the general purpose register set yet. This situation is referred as Data hazard. Further there exist another type of hazard in this type of pipelined architecture known as Control hazard. Control hazard arise due to inability of the processor to decide which instruction to be fetched next within time. In this paper we will study the different techniques to resolve these hazards.
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Many industry and military system safety standards now highly recommend or mandate the use of hazard logs or hazard tracking systems in the development and operation of safety critical systems. The requirement to record and track ...
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Many industry and military system safety standards now highly recommend or mandate the use of hazard logs or hazard tracking systems in the development and operation of safety critical systems. The requirement to record and track the results of hazard analysis and risk assessment throughout the lifecycle of the system often gives rise to large amounts of information that requires tool support for the management of hazard data. Although most of the standards, that require hazard tracking systems or hazard logs, provide some particular requirements for the nature of information that needs to be tracked, they often only provide a subset (i.e. minimum set of information) of what is required for an effective and efficient implementation of a hazard tracking system. This paper describes at the key requirements for a practical closed-loop system and demonstrates a practical implementation in Telelogic DOORS.
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Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and economic loss and harm in industry. These incidents are often the result of not identifying or understanding the chemical reactivit...
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Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and economic loss and harm in industry. These incidents are often the result of not identifying or understanding the chemical reactivity hazards involved in storage, mixing or processing operations. The chemical reactivity evaluation Tool (RMT) and the Help Guide that accompanies it can be used as an aid in identifying and evaluating chemical reactivity hazards so that they may be effectively avoided or controlled. This paper will describe the RMT and demonstrate its use in identifying reactivity hazards in chemical storage, handling and processing operations. The RMT and Help Guide are available as a free download from AIChE (www.aiche.org).
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摘要 :
Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and economic loss and harm in industry. These incidents are often the result of not identifying or understanding the chemical reactivit...
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Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and economic loss and harm in industry. These incidents are often the result of not identifying or understanding the chemical reactivity hazards involved in storage, mixing or processing operations. The chemical reactivity evaluation Tool (RMT) and the Help Guide that accompanies it can be used as an aid in identifying and evaluating chemical reactivity hazards so that they may be effectively avoided or controlled. This paper will describe the RMT and demonstrate its use in identifying reactivity hazards in chemical storage, handling and processing operations. The RMT and Help Guide are available as a free download from AIChE (www.aiche.org).
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摘要 :
Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and
economic loss and harm in industry. These incidents are often the result of not identifying or
understanding the chemical reactiv...
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Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and
economic loss and harm in industry. These incidents are often the result of not identifying or
understanding the chemical reactivity hazards involved in storage, mixing or processing
operations. The chemical reactivity evaluation Tool (RMT) and the Help Guide that
accompanies it can be used as an aid in identifying and evaluating chemical reactivity
hazards so that they may be effectively avoided or controlled. This paper will describe
the RMT and demonstrate its use in identifying reactivity hazards in chemical storage,
handling and processing operations. The RMT and Help Guide are available as a free
download from AIChE.
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摘要 :
Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and economic loss and harm in industry. These incidents are often the result of not identifying or understanding the chemical reactivit...
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Incidents involving uncontrolled chemical reactions continue to result in injuries, fatalities and economic loss and harm in industry. These incidents are often the result of not identifying or understanding the chemical reactivity hazards involved in storage, mixing or processing operations. The chemical reactivity evaluation Tool (RMT) and the Help Guide that accompanies it can be used as an aid in identifying and evaluating chemical reactivity hazards so that they may be effectively avoided or controlled. This paper will describe the RMT and demonstrate its use in identifying reactivity hazards in chemical storage, handling and processing operations. The RMT and Help Guide are available as a free download from AIChE (www.aiche.org).
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The supervision system of hazardous chemical based on the WEBGIS technology is constructed, which displays the reality of the situation and simulates the accident consequence of security risks (including major risk sources) to the...
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The supervision system of hazardous chemical based on the WEBGIS technology is constructed, which displays the reality of the situation and simulates the accident consequence of security risks (including major risk sources) to the user in the form of map, realizes the registration of hazardous chemicals, enterprise qualification examination, administrative licensing of hazardous chemical construction projects, and investigation and rectification of the potential safety hazard in hazardous chemicals enterprise as well as management and supervision in other related business process through information means, and improves the ability of supervision and emergency rescue in chemical safety production. It has an important significance to prevent and control the major hazard. This paper introduces the supervision system of hazardous chemicals and the structure, database design, and system application of the supervision system.
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摘要 :
The supervision system of hazardous chemical based on the WEBGIS technology is constructed, which displays the reality of the situation and simulates the accident consequence of security risks (including major risk sources) to the...
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The supervision system of hazardous chemical based on the WEBGIS technology is constructed, which displays the reality of the situation and simulates the accident consequence of security risks (including major risk sources) to the user in the form of map, realizes the registration of hazardous chemicals, enterprise qualification examination, administrative licensing of hazardous chemical construction projects, and investigation and rectification of the potential safety hazard in hazardous chemicals enterprise as well as management and supervision in other related business process through information means, and improves the ability of supervision and emergency rescue in chemical safety production. It has an important significance to prevent and control the major hazard. This paper introduces the supervision system of hazardous chemicals and the structure, database design, and system application of the supervision system.
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Based on the characteristics of production techniques and the theory of lose control of energy releasing, an investigation on identification, analysis and control of hazard sources in the process system of preparing coal, coking, ...
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Based on the characteristics of production techniques and the theory of lose control of energy releasing, an investigation on identification, analysis and control of hazard sources in the process system of preparing coal, coking, reclaiming, maintaining and dynamics in a coking plant has been carried out. Many analysis methods such as Preliminary Hazard Analysis (PHA), Failure Modes Effects Analysis (FMEA), Fault Tree Analysis(FTA)and Hazard And Operability Studies (HAZOP) have been used. In the hazard units, index of hazard frequency and degree of hazard severity have been calculated out. Hazard Source management grades have also been confirmed. At last, the hazard control measures in a coking plant have been brought forward.
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摘要 :
Based on the characteristics of production techniques and the theory of lose control of energy releasing, an investigation on identification, analysis and control of hazard sources in the process system of preparing coal, coking, ...
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Based on the characteristics of production techniques and the theory of lose control of energy releasing, an investigation on identification, analysis and control of hazard sources in the process system of preparing coal, coking, reclaiming, maintaining and dynamics in a coking plant has been carried out. Many analysis methods such as Preliminary Hazard Analysis (PHA), Failure Modes Effects Analysis (FMEA), Fault Tree Analysis(FTA)and Hazard And Operability Studies (HAZOP) have been used. In the hazard units, index of hazard frequency and degree of hazard severity have been calculated out. Hazard Source management grades have also been confirmed. At last, the hazard control measures in a coking plant have been brought forward.
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