The North-West Corner Method is a powerful technique for solving transportation problems in further mathematics. Its simplicity and effectiveness make it a popular choice for decision-making and resource allocation tasks. This article will provide an in-depth understanding of the method, its applications in decision mathematics, and a step-by-step guide to solving transportation problems using this approach. In addition, it will cover examples of real-life problems and offer tips and techniques for effectively dealing with unbalanced transportation situations. So, fasten your seatbelts as you embark on a journey to master the North-West Corner Method in further mathematics.
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Jetzt kostenlos anmeldenThe North-West Corner Method is a powerful technique for solving transportation problems in further mathematics. Its simplicity and effectiveness make it a popular choice for decision-making and resource allocation tasks. This article will provide an in-depth understanding of the method, its applications in decision mathematics, and a step-by-step guide to solving transportation problems using this approach. In addition, it will cover examples of real-life problems and offer tips and techniques for effectively dealing with unbalanced transportation situations. So, fasten your seatbelts as you embark on a journey to master the North-West Corner Method in further mathematics.
The North-West Corner Method is a simple and efficient technique used primarily for solving transportation problems in operations research and linear programming. The objective of these problems is typically to allocate resources optimally from a set of origins or sources to a set of destinations or sinks while minimizing overall transportation costs.
A transportation problem can be mathematically represented as finding the optimal solution to the following linear programming problem:
\[ \text{Minimise } Z = \sum_{i=1}^{m}\sum_{j=1}^{n} c_{ij}x_{ij} \]
Subject to the following constraints:
Where:
Note that a transportation problem is considered balanced if the total supply equals the total demand, i.e., \(\sum_{i=1}^{m} a_i = \sum_{j=1}^{n} b_j\). If the problem is unbalanced, a dummy source or destination is added to make the problem balanced before applying the North-West Corner Method.
The North-West Corner Method involves the following steps:
Example: Suppose there are two origins (O1 and O2) with supplies of 40 and 60 units, respectively, and three destinations (D1, D2, and D3) with demands of 50, 30, and 20 units. The unit costs of transportation are given in the following table:
D1 | D2 | D3 | |
O1 | 4 | 5 | 3 |
O2 | 2 | 3 | 4 |
Applying the North-West Corner Method for this example, the optimal allocation results in the following transportation table:
D1 | D2 | D3 | |
O1 | 40 | 0 | 0 |
O2 | 10 | 30 | 20 |
The total cost of transportation is 330 units.
The North-West Corner Method is an essential tool in decision mathematics, as it provides an easy-to-follow approach to solve a wide range of real-world resource allocation problems. Some common applications include:
Although the North-West Corner Method may not always provide the optimal solution to a transportation problem, it offers a quick and straightforward initial solution that can serve as the starting point for more advanced optimization techniques, such as the stepping-stone method or the modified distribution (MODI) method.
The North-West Corner Method provides a simple and systematic approach to solving transportation problems by allocating resources from a set of origins to a set of destinations while minimizing overall transportation costs. In this section, we will delve deeper into the process and explore examples and various scenarios for using this method.
Let us start with a detailed example to understand how the North-West Corner Method works in practice. Suppose we have a transportation problem involving three origins (O1, O2, and O3) with supplies of 40, 50, and 60 units, respectively, and four destinations (D1, D2, D3, and D4) with demands of 30, 35, 45, and 40 units. The unit costs of transportation are given in the table below:
D1 | D2 | D3 | D4 | |
O1 | 3 | 1 | 7 | 4 |
O2 | 2 | 6 | 5 | 2 |
O3 | 8 | 3 | 3 | 2 |
Following the steps outlined previously for the North-West Corner Method, we proceed as below:
By applying the method, the resulting transportation table is as follows:
D1 | D2 | D3 | D4 | |
O1 | 30 | 0 | 0 | 10 |
O2 | 0 | 35 | 5 | 10 |
O3 | 0 | 0 | 40 | 20 |
The total cost of transportation, in this case, is 600 units.
The transportation model is a mathematical representation of the transportation problem. It consists of origins, destinations, supplies, demands, and costs associated with transporting resources from each origin to each destination. When using the North-West Corner Method to solve a transportation model, we can summarise the process into the following steps:
The transportation model North-West Corner Method provides a robust framework for solving transportation problems, though it might not guarantee the optimal solution. However, it offers an efficient starting point for more advanced optimisation techniques.
An unbalanced transportation problem occurs when the total supply does not equal the total demand. Before applying the North-West Corner Method to an unbalanced problem, we must first balance the problem by introducing a dummy origin or destination with a supply or demand equal to the imbalance. Let's consider an example of an unbalanced transportation problem.
Suppose there are two origins (O1 and O2) with supplies of 40 and 60 units, respectively, and three destinations (D1, D2, and D3) with demands of 30, 40, and 20 units. Notice that the total supply (100 units) is greater than the total demand (90 units). To balance the problem, we introduce a dummy destination (D4) with a demand equal to the imbalance (10 units).
After adding the dummy destination, the unit costs of transportation are given in the table below:
D1 | D2 | D3 | D4 | |
O1 | 3 | 5 | 2 | 0 |
O2 | 4 | 3 | 1 | 0 |
Now, we can apply the North-West Corner Method to the balanced transportation problem to find the optimal resource allocation. Once the problem is solved, you can exclude the costs and allocations associated with the dummy destination to get the final solution for the original unbalanced problem.
The North-West Corner Method consists of several essential steps, which we will now discuss in greater detail. It is essential to understand and follow these steps to apply the method accurately in solving transportation problems:
Unbalanced problems in the North-West Corner Method require special attention. It is crucial to balance these problems correctly to avoid any inaccuracies in the final solution. To handle unbalanced transportation problems, follow these steps:
To ensure that the North-West Corner Method is applied efficiently and accurately, consider the following tips:
By applying these tips in conjunction with the essential steps and procedures for dealing with unbalanced problems, you can efficiently and effectively solve transportation problems using the North-West Corner Method.
The advantages of the Northwest corner cell method include: 1) It provides a straightforward, easy-to-understand initial solution to transportation problems. 2) It allows for quick calculations for large-scale problems. 3) It acts as a useful starting point for further optimization using other methods.
The difference between the North-West Corner Method and the Least Cost Method lies in their approaches to solving transportation problems. The North-West Corner Method selects the starting solution by allocating resources to the top-left cell and moving diagonally, without considering costs. In contrast, the Least Cost Method chooses the starting solution by allocating resources to the cell with the lowest cost, aiming for an overall lower transportation cost.
The disadvantage of the north-west corner rule is that it does not guarantee an optimal solution for transportation problems, as it focuses on filling cells based on availability rather than cost. Additionally, it may result in a higher total cost when compared to other methods like the Vogel's approximation method or stepping stone method.
The transportation cost by the North-West Corner Method refers to the total cost of transporting goods from multiple supply sources to various destinations while adhering to supply and demand constraints. This method is a simple and efficient approach for solving transportation problems, which helps minimise the overall cost in a linear programming context.
To use the north-west corner rule, first, identify the top-left cell (north-west corner) of the cost matrix. Allocate the maximum feasible quantity to this cell without exceeding supply or demand. Move to the next available cell (right or down) and repeat the allocation process. Continue until all supplies and demands are satisfied.
What is the objective of transportation problems solved using the North-West Corner Method?
The objective is to allocate resources optimally from a set of origins to a set of destinations while minimizing overall transportation costs.
What makes a transportation problem balanced?
A transportation problem is considered balanced if the total supply equals the total demand, i.e., ∑a_i = ∑b_j.
What are the steps of the North-West Corner Method?
1. Choose the north-west cell as the starting point. 2. Allocate resources without exceeding the supply or demand constraints. 3. Move to the next available cell if supply or demand is met. 4. Repeat steps 2 and 3 until all supplies and demands are satisfied.
What are some applications of the North-West Corner Method?
Applications include transportation and logistics, supply chain management, economics, and network routing in decision mathematics.
What is the primary goal of the North-West Corner Method?
Minimizing overall transportation costs while allocating resources from a set of origins to a set of destinations.
How do you deal with an unbalanced transportation problem using the North-West Corner Method?
Introduce a dummy origin or destination with a supply or demand equal to the imbalance, then apply the North-West Corner Method to the balanced problem, and finally exclude the costs and allocations associated with the dummy destination to get the final solution.
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