Resource scheduling in cloud computing is a complex task due to the number and variety of resources available and the volatility of usage-patterns of resources considering that the resource setting is on the service provider. This compounded further when security issues are also factored in. This paper provide a Systematic Literature Review (SLR) that will help to identify as much prior relevant research that has been done in the area of research topic. Also, all papers that are found from the search will be classified into groups to stand on the current situation and to identify possible existing gaps.

Resource scheduling is concerned with selecting the most appropriate resources to meet the needs of consumers. This is a complex task in Cloud Computing because of the large amount of available resources such as applications and data storage facilities. This is compounded further when security issues and quality of service are also factored in. A Scheduling Security Model (SSM) for Cloud Computing has been developed to address these issues. This paper will apply the SSM model on some examples with different scenarios to investigate the cost and the effect on the service requested by customers.

This paper presents a technique to generate optimal results during resource allocation The whole procedure is discussed and solved .A new integer programming (IP) model is presented that supports the optimal allocation of useful resources in a university environment during the process of daily timetable generation keeping in view the priorities of both the teachers and administration The time consuming task of time table generation in any organization can be performed easily by properly formulating a mathematical model. No matter how complex is the process of resource allocation of an organization, if we formulate the mathematical model in an efficient manner avoiding the redundancy the desired result can be achieved easily.involve yes-no type decisions for example should a certain factory be build? Should a certain investment be made? Situations like these are modeled by introducing binary decision variables to mathematically handle the yes-no decision. The model that is described in this paper is also a situation of 0-1 integer programming. Mathematical Model.A mathematical model is an optimization problem of the form:Maximizef(x): x in X, g(x) < = O, h(x) = 0, Where the relations, g(x) <= 0 and h(x) = 0 are called constraints, and f is called the objective function. In simple words it is a set of related mathematical functions whose purpose is to simulate the response of the system being modeled.

Scheduling tasks on a standalone system can be complex but applying it to a cloud environment can be even more complex because of the large amount of resources available. An added complexity in a Cloud environment is that of security. This paper addresses scheduling from a security point of view and presents a Scheduling Security Model and evaluates its effectiveness to meet user's requirements with a number of worked examples with different scenarios.

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