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# Tutor profile: Sumanta R.

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Sumanta R.
Business Analyst in a reputed MNC and an online tutor for last 3 years
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## Questions

### Subject:Mechanical Engineering

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Question:

Why should we use integer programming?

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Sumanta R.

Integer (or discrete) programming problem is a special class of linear programming problems where all or some of the variables in the optimal solutions are restricted to non-negative integers i.e., in which decision variables have integer solutions. We quite often face situations where the planning models contain integer valued variables. For instance, trucks in a fleet, generators in a powerhouse, pieces of equipment, investment alternatives, etc. In all such cases, an integer solution is desired, which can be easily obtained by rounding off the fractional values of the variables. But, rounding-off may result in sub-optimal or infeasible solutions. To overcome such difficulties, a different optimization model, which is referred to as integer programming has been developed.

### Subject:Manufacturing Engineering

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Question:

What is the difference between lean manufacturing and JIT (Just-in-Time) Manufacturing?

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Sumanta R.

Lean Manufacturing: The term lean in the manufacturing context identification of waste in all the process. It takes the concept of JIT and it is business philosophy that continuously improves all the processes involved in a manufacturing environment. It means increasing speed by reducing the process time. It results in reduction of cost and faster action. Example: Nike, the super-cool clothing company worked with NGOs and fellow manufacturers on sustainability projects to create performance indicators and sustainable sourcing and launched the Sustainable Apparel Coalition with the US Environmental Protection Agency and other manufacturers, and in the process saved money on energy and waste materials. JIT (Just-in-Time): This methodology is aimed to ensure that a product or part would arrive just in time to be used. The primary goal of JIT is to achieve zero inventory within an organization as well as throughout the entire supply chain. Example- Apple works with little inventory on hand as possible. By lowering the amount of stock on hand, this consumer electronics giant carries a lower risk of overstocking in its warehouses. As explained by Tim Cook, CEO of Apple, “Inventory is fundamentally evil. You kind of want to manage it like you’re in the dairy business. If it gets past its freshness date, you have a problem.”

### Subject:Industrial Engineering

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Question:

The Office Supply Shop estimates that the average demand for a popular ball-point pen is 12,000 pens per week with a standard deviation of 3,000 pens. The current inventory policy calls for replenishment orders of 156,000 pens. The average lead time from the distributor is 5 weeks, with a standard deviation of 2 weeks. If management wants a 95 per cent cycle service level, what should the reorder point be?

Inactive
Sumanta R.

We have d = 12,000 pens, σd = 3,000 pens, L = 5 weeks, and σLT = 2 weeks σdLT = Square-root[L*σd*σd + d*d*σLT*σLT]=Square-root[(5)(3,000)(3000) + (12,000)(12000)(2)(2)] = 24,919.87 pens From the Normal Distribution appendix for 0.9500, the appropriate z value = 1.65. We calculate the safety stock and reorder point as follows: Safety stock = zσdLT = (1.65)(24,919.87) = 41,117.79 or 41,118 pens Reorder point = dL + Safety stock = (12,000)(5) + 41.118 = 101,118 pens

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