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Ant colonies, and more commonly social insect societies, are scattered structures that, in spite of the simplicity of their individuals, present a highly well thought-out social organization. Because of this enterprise, ant colonies can accomplish complex duties that in some instances a ways exceed the individual capacity of a single ant. This paper focus on ant colony and behaviour of ant when it searches for food. Most of the conversation among individuals and between individuals and environment in an ant colony is based on use of chemical produced by Ants. These chemicals are called "pheromones". "Trail Pheromone" is a specific type of pheromone that some ant species use for marking paths on the ground. In this paper the trail pheromone behaviour and its mathematical model is used for finding minimum length tool path for a PCB drilling process. The problem is also similar to travelling salesman problem(TSP) and solution method is similar to the solution of TSP with the only difference in terms of distance values and the route method.

With the rise used of biomedical images for diagnosis of diseases of a patient at various hospitals, the quality measurement of images is necessary for better diagnosis. The need for biomedical images quality measurement due to the transmission of images from one place to another place within hospitals or remote health centers. The lots of distortions may affect the quality of biomedical images during transmission. So, in this paper, the various image quality assessment parameters discussed for biomedical images. The paper gives information on various full reference-based objective assessment (OA) image quality measurement (FR-IQM) standards. The paper also gives performance analysis of FR-IQM standards for biomedical images.