Tuesday, January 19, 2010

Plant Maintenance Points

There are different types of Plant Maintenance :-

Maintenance systems can be grouped into 5 major groups:
1.Operator Maintenance
2.Breakdown Maintenance
3.Scheduled Maintenance
4.Planned Maintenance
5.Preventive Maintenance

The purpose of maintenance is to make available for production purpose, machinery and equipment to fulfill their technological functions as specified and economically which means that the output quality and quantity from each machine or equipment will conform to specified purposes.
Performance tuning is the improvement of system performance. This is typically a computer application, but the same methods can be applied to economic markets, bureaucracies or other complex systems. The motivation for such activity is called a performance problem, which can be real or anticipated. Most systems will respond to increased load with some degree of decreasing performance.
A system's ability to accept higher load is called scalability, and modifying a system to handle a higher load is synonymous to performance tuning.

• Systematic tuning follows these steps:
1. Assess the problem and establish numeric values that categorize acceptable behavior.
2. Measure the performance of the system before modification.
3. Identify the part of the system that is critical for improving the performance. This is called the bottleneck.
4. Modify that part of the system to remove the bottleneck.
5. Measure the performance of the system after modification.

This is an instance of the measure-evaluate-improve-learn cycle from quality assurance.
A performance problem may be identified by slow or unresponsive systems. This usually occurs because high system loading, causing some part of the system to reach a limit in its ability to respond. This limit within the system is referred to as a bottleneck.
A handful of techniques are used to improve performance. Among them are code optimization, load balancing, caching strategy, and distributed computing, and self-tuning.
The topics covered in this are:-
1. Performance analysis
2. Performance engineering
3. Code optimization
4. Caching strategy
5. Load balancing
6. Distributed computing
7. Self-tuning
8. Bottlenecks

Document management system

A document management system (DMS) is a computer system (or set of computer programs) used to track and store electronic documents and/or images of paper documents. The term has some overlap with the concepts of content management systems. It is often viewed as a component of enterprise content management (ECM) systems and related to digital asset management, document imaging, workflow systems and records management systems.
In the broadest sense, document management systems can range from a shoebox all the way to an enterprise content management system. There are several common issues that are involved in managing documents, whether the system is an informal, ad-hoc, paper-based method for one person or if it is a formal, structured, computer enhanced system for many people across multiple offices.
Where will documents be stored? Where will people need to go to access documents? Physical journeys to filing cabinets and file rooms are analogous to the onscreen navigation required to use a document management system.
How will documents be filed? What methods will be used to organize or index the documents to assist in later retrieval? Document management systems will typically use a database to store metadata about documents and a File System to store the actual physical files.
How will documents be found? Typically, retrieval encompasses both browsing through documents and searching for specific information. What kind of information about documents are indexed for rapid retrieval?
How will documents be kept secure? How will unauthorized personnel be prevented from reading, modifying or destroying documents?
Disaster recovery
How can documents be recovered in case of destruction from fires, floods or natural disasters?
Retention period
How long should documents be kept, i.e. retained? As organizations grow and regulations increase, informal guidelines for keeping various types of documents give way to more formal records management practices.
How can documents be preserved for future readability?
How can documents be available to the people that need them?
If documents need to pass from one person to another, what are the rules for how their work should flow?
How are documents created? This question becomes important when multiple people need to collaborate, and the logistics of version control and authoring arise.
Is there a way to vouch for the authenticity of a document?
When, where and by whom are documents created, modified, published and stored?

Functions of DMS
Audit Trail
Document Security
Document Control
Adhering to Compliance