Monday, July 26, 2010

Production and Operation Management: Generic Concept

This essay contains following topics:
- Introduction
- Present day corporate & industry situation
- Definition of production and operation management system
- Components of production and operation management systems
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Recently, while coming back from Tatanagar after a meeting with TATA Steel, I met a senior marketing professional Mr. S. K. Roy. Mr. Roy is a paint specialist and having ample knowledge about present day industries.During our 4 hours journey, we were discussing various issues, including the plant and production practices at different companies, like Tata Steel, Jindal Steel, Essar Steel, etc. In contrary, we had discussed different small scale industry practices, too. Also, we had touched different paint manufacturers like Asian Paints, Berger Paints, ICI paints, Shalimar Paints, etc.

Our discussion was focused on human resources and their change in behaviors with respect to different companies. Also, we were discussing about lack of appropriate personnel which today’s hardcore industry is facing.It is true that for last one decade a considerable amount of engineers and professionals have shifted their career towards software and service sector jobs. Definitely, software and service sector jobs are perfectly white colour profession with an attraction of foreign trips. Also in most of the cases these jobs require defined skills where challenges are more defined. So it automatically attracts a huge population. But this trend towards software and service sector has created a vacancy in the hardcore sector. This vacancy also has increased salary level of the hardcore sector enormously. But it is true that hardcore sector is starving with proper experienced man power and this scenario will be worse even in future. I can guess that, 80% of the students, who had passed engineering with me ten years ago, is presently working in software companies, like TCS, Wipro, Infosys, CTS, Capegemini, etc. Today after serving 10 years in the software industry and service sector they can not come back to their basic stream of mechanical, civil or electrical engineering. Because the knowledge base, operation and production management concepts, as well as the practices and culture in the software industry can never match with the hardcore industries. Industry wise, the software (including service sector) and hardcore sectors are definitely different and their production procedures are also different. But are the basic production and operation theories also differ for these two sectors?

What is production and operation management system in general?

Production and operation management is the art of managing man, machine, material, money and method to produce goods and services, effectively and efficiently. Production and operation are involved in converting inputs into output through transformation processes. Traditionally production implies the process which is involved in mass production of tangible goods. Later on services also began to “produced” or rendered. As the complexities increased and business grew, proper system of managing production became essential.
In the process of study of effective and efficient system, it may be observed that some principles can be applied for both goods and service sectors. These principles form the concept of production and operation management system.

The major components of production and operation management systems are as follows:
* Input
* Transformation process
* Output
*Quality

* Input:
Input includes man, machine, method, money, material and management. In hardcore industry, all the components of inputs are easily identifiable. But in service sector and software sector the “material” input is tough to distinguish. Here material can be found in the logical codes which are prepared based on customer requirements.

* Transformation process:
This is the process by which inputs are converted into output.
Major components of transformation system are as follows:
Alteration: This process involves in change of shape of inputs, i.e. change in physical and chemical state of input. In hardcore sector, for example in a steel plate manufacturing process, the complete process from raw material handling system to rolling mills via furnaces are involved in the alteration method. In software and service sector, programs can be identified as alteration methods.
Transportation: This process involves in physical movement of the goods. The goods can be input goods, in-process goods or output goods. In hardcore sector transportation process needs no explanation. In service sector and software system, transportation can be through email, FTP servers, and websites.
Storage: This process involves in preservation of goods, i.e. protection of goods from any adverse conditions. In hardcore sector storage process can easly be visualized. In software and service sector, storage placed at servers. Also storage is possible in CD, DVD, etc. For protection, various anti viruses are used.

* Output:
An output can be goods or services.

The major difference between goods and services are as follows:
i) Goods are tangible. For example, one can easily experience TATA NANO, because it is a tangible goods. Services are intangible. Management Information System (MIS) in any company can be one example.
ii) Goods are produced in the factory environment, which is away from customer. TATA NANO is produced in a factory at Gujrat Village. Services are produced in the market environment, in collaboration with the customer. For construct a MIS, the software and service team needs to be stationed in the respective company premises and prepare the whole program for the same there itself.
iii) Goods can be produced, stored and transported according to the demand. TATA NANO is one example for the same. Services produced only when it is required. A MIS is designed and “produced” when a company needs a MIS.
iv) Goods are normally standardized. TATA NANO is a standard product with standard features. Services are normally customized. MIS of different companies differs based on their requirements, practices and cultures.
v) Quality is the inherent part of the goods. TATA NANO’s quality is reflected in its car only. Quality is embedded in the process by which services are “produced” or rendered. When a MIS is “produced”, then the implementation process follow quality paths which ensures fault free MIS. Now a day, some goods manufacturing companies are also following the concept of service sector. One example can be DELL computers. DELL is delivering laptops based on customer’s requirements.

* Quality: Quality control is the most important aspect of modern production and operation management. As the competition is increasing, the concept of quality is becoming more and more important.
What is quality?
Quality is the characteristics of an entity which satisfy customer’s stated and unstated needs. Entity refers to goods or services, and customer refers to external customer of the organization, as well as internal customer within the organization. External customer is well understood term. But who are the internal customers for an organization? Internal customers means the employees within the organization. Every employee who is directly or indirectly related to the other employee is the internal customer of later employee.
Concept of quality is so important that, quality of the product from input to output via transformation process must satisfy all related parties, internal and external. Naturally, this unique concept of definition stress on the inherent quality. That means only raw material or finished good quality is not important, also the quality of the whole transformation process should be assured. Concept of quality control is equally applicable for hardcore sector and service sector.

In modern business environment, both the sectors are giving equal importance on the quality improvement of transformation processes, as well as quality of the input and output entities. To ensure quality of input, in-process and output entities, as well as quality of whole transformation process, both the sectors are now stressing on quality improvement of its man power also. So in modern day, the whole industry is trying to follow a concept of production and operation management system, which is principally same but the implementation is customized based on the company and its sector.

Nirjhar Chakravorti


Saturday, July 17, 2010

Concept of Product Design


Mitsubishi Motor's model

An article by Nirjhar Chakravorti

(Mechanical Engineer, Jalpaiguri Govt. Engg. College, 2000 batch; PGDBM)

This essay contains:
What is product design?
Objectives of product design
Features of a good product design
Concepts of product design
Steps of product design

What is product design?

Product design is conceptualization of an idea about a product and transformation of the idea into a reality. To transform the idea into reality a specification about the product is prepared. This specification is prepared by considering different constraints such as production process, customer expectation, etc. In product design stage every aspects of the product are analyzed. Also final decision regarding the product is taken on the basis of the analysis. This decision can be any aspect related to the product, e.g. dimension and tolerances, type of material for every components, etc.

Product design is one of the most important and sensitive factor for an organization. Success or failure of the product decides company’s business, market share and reputation. So during design stage various factors related to the product needs to be addressed.

Objectives of product design:

* To ensure growth of the organization
* To utilize the surplus capacity of the organization, such as physical facility, man power, etc.
* To utilize the surplus fund of the organization
* To meet new requirement of the customers
* To increase company’s market share and to target new market segment
* To ensure complete product range in company’s portfolio

Features of a good product design:

Functionality: The product must function properly for intended purpose.
Reliability: The product must perform properly for the designated period of time.
Productivity: The product must be produced with a required quantity and quality at a defined and feasible cost.
Quality: The product must satisfy customer’s stated and unstated needs.
Standardization: The product should be designed in such a fashion so that most of the components are standardized and easily available in the market.
Maintainability: The product must perform for a designated period with a minimum and defined maintenance. Adequate provision for maintenance should be kept in the product.
Inspectionability: Sufficient option must be kept in the product so that critical and maintainable components can be checked and inspected (as required) with ease.
Cost effectiveness: The product must be cost effective. This must be manufactured in the most cost effective environment.

Wind power energy, new model
Concepts of product design:

Research & development:
Basic research is a search for new knowledge. It does not have any immediate application, but based on the basic research new product can be developed in future. Applied research has objective of developing commercial products.

Reverse engineering:
Reverse engineering is the process of carefully dismantling a product, understanding its design and developing a product which is better than the existing one.

CAD-CAM: By using 3D modeling software system, designers develop a computerized model of a new product and analyze its design parameters. After computer aided design (CAD), computer aided manufacturing (CAM) system produce the product by using CNC facility.

Concurrent engineering (CE): CE is different than conventional approach of design. In CE, different co-related teams are formed, which perform different activities for developing a product. For example, development of market concept, design of product, development of manufacturing process, selection and arrangement of material for new design is performed by different teams at the same time. It reduces considerable amount of time to develop a new product.

In practice different concepts are combined and applied together to design a new product.

Volvo's first model
Steps of product design:

Synthesis: Try to develop different alternatives
Sketching: Draw sketches in exact scale for different alternatives
Analysis: Analysis different alternatives with respect to operability, maintainability, inspection, assembling and dismantling issues, cost parameters, production methods, etc. Concept of Life Cycle Costing can also be adopted, in case of necessity.
Selection: Select the best alternative
Basic engineering: Prepare layout in exact scale, calculate strength of components, and select proper cost effective material.
Detail design: Prepare detail engineering drawing for each component
Prototype: If option is there, then prepare prototype and test it
Manufacturing: If prototype is not made, then follow manufacturing steps and solve manufacturing problems and assembly problems, if any.
Operation: collect feedback during actual operation of the new product. If any problem exists, try to provide design based solution. Also, implement lessons in the future design. Concept of TPM (i.e. Fuguai or "abnormalities", Kaizen or "improvements", etc) can be applied.
Product development: If any modification can be done, implement the same in the next generation product.

World's largest excavator, 45500 ton capacity, Krup make

Sunday, July 4, 2010

Price and Demand Function

There is a huge country wide protest against central government’s decision to raise fuel prices on 25th of June, 2010. Indian Government has released state owned control on fuel prices on Friday and raised prices of fuel to overcome budget deficit.
Price is the trickiest affair that affects the whole society’s life style and living hood.
The price hike for essential commodities has negative impact on society’s overall life style. But for normal goods, consumers are in a better position to react with respect to price hike.

How price affects the market?

The short answer of the above question can be written as “price affects the demand of any product.” So, price is a factor for demand function of a product.

This discussion is restricted on normal goods only. Also, here the basic economic concept of price is discussed with respect to demand of a normal goods.

What is demand function?

Demand function is the symbolic statement of relationship in between demand for a product (dependant variable) and its determinants (independent variables).
If a demand function has a single independent variable, then it is called simple demand function. When demand function has many independent variables, then it is called dynamic demand function.

Simple demand function:

In simple demand function, it is assumed that, quantity demanded for a product X depends only on its price (Px), other factors remaining constant.
Subsequently it is written as,

Dx = f(Px), where quantity demanded (Dx) is dependant variable and Price (Px)is independent variable.

The form of equation depend on the demand-price relationship. Depend on the relation of demand and price, the demand function can be linear or non linear.

Linear demand function:

The simplest form of linear demand function can be expressed as,

Dx = -m Px + c;

where, c = quantity demanded for price zero
-m = slope of the demand curve, physically it means change in Dx for change in Px;
Here slope is constant (dDx/dPx) = constant

This is an equation of straight line (y=-mx+c), where “c” and “-m” are constants.
If values of “-m” and “c” are known, then for a given price, quantity demanded for a product can be calculated.
Say for any market condition, m=10 and c=100,
Then the equation becomes, Dx=-10Px+100.
By this equation different set of demand for a product can be calculated for different set of price.
For example,
if Px = 5, then Dx = -10x5 + 100 = 50

if Px = 6, then Dx = -10x6 + 100 = 40

if Px = 7, then Dx = -10x7 + 100 = 30

if Px = 8, then Dx = -10x8 + 100 = 20
if Px = 9, then Dx = -10x9+100 = 10






Non-linear demand function:
The simplest form of non-linear demand function can be expressed as,

Dx = a Px-b;
where a & b = constant
Here slope of the demand curve, physically it means change in Dx for change in Px is not constant;
i.e. (dDx/dPx) is not constant



Dynamic demand function:

It is also known as multi variable demand function.
In long run the market demand for a product depends on the combined impact of all independent variables. So in this case demand is function of various independent variables, and the equation can be expressed as,

Dx = f(Px, Ps, Pc, Y, T, A);

where quantity demanded (Dx) is dependant variable and all other variables are independent.
Px = Price of the product
Ps = Price of substitute goods
(Substitute goods are almost equal goods which serve the same purpose. Tea and café are substitute goods for each other)
Pc = Price of complementary goods
(Complementary goods that usually are consumed together; Demand for one falls when the other's price rises and vice versa. Café and sugar are complementary goods for each other)
Y = Consumer’s income
T = Consumer’s taste
A = Firm’s advertisement expenditure

If relations between Dx and Px, Ps, Pc, Y, T and A are linear, then the probable equation may be expressed as,

Dx = a + b Px + c Ps + d Pc + j Y + m T + n A;

where a, b, c, d, j, m & n are constant.
In normal market condition demand function react in the dynamic model, where price of the product plays the most crucial role.