http://dlib.iit.ac.lk/xmlui/handle/123456789/420 2026-04-06T22:11:08Z 2026-04-06T22:11:08Z Suwandarathna, Subashana Koggalage, Ravindra http://dlib.iit.ac.lk/xmlui/handle/123456789/429 2020-05-27T08:10:44Z 2007-01-01T00:00:00Z

Increasing hard drive performance - from a thermal perspective Suwandarathna, Subashana; Koggalage, Ravindra The importance of input/output (I/O) performance, hard disks in particular grows over the years. Speed and performance of semiconductor components have grown rapidly and the hard disk I/O sub system cannot cope with that rate. Many have attempted to remove this I/O bottleneck using several techniques such as better cache management, parallelism in the form of RAID, high bandwidth interconnections such as SAN, improved read/write head designs and improved cooling systems. Most of them had not considered the fundamental factor affecting the I/O performance; heat generated within the disk drive from the read/write process. This paper presents a method to increase the hard disk I/O performance by operating the hard drives in a vendor recommended temperature range. Operating the hard drives in the safe temperature range would not only provide performance improvements, it also provide more reliable disk drives by eliminating the off track errors and head crashes. To achieve the above mentioned performance increase, this paper suggests a disk drive model which would work according to the variations of the temperature of the disk drive model.

2007-01-01T00:00:00Z Ponweera, Rajiv. J. C. Koggalage, Ravindra Wickramage, Narada http://dlib.iit.ac.lk/xmlui/handle/123456789/428 2020-05-27T08:03:33Z 2007-01-01T00:00:00Z

Evaluation and demonstration of the usage of a virtual honeynet for monitoring and recording online attacks Ponweera, Rajiv. J. C.; Koggalage, Ravindra; Wickramage, Narada Even though the Internet has revolutionized our perception of global communications and business, it is also feared as one of the stealthiest threats to both individuals and organizations alike. The threats posed vary from simple port scans to the distribution of viruses, worms and the deployment of distributed denial of service attacks by malicious Hackers, also known as Blackhats. This project addresses the above problem domain and strives to provide a reliable mechanism to gather information of suspected and ongoing attacks through the implementation of a virtual honeynet. The acquired information could be used to build enhanced security measures against Blackhat attacks.

2007-01-01T00:00:00Z Mohamed, Abdul Wahid Koggalage, Ravindra http://dlib.iit.ac.lk/xmlui/handle/123456789/427 2020-05-27T07:57:24Z 2007-01-01T00:00:00Z

Control of mouse movements using human facial expressions Mohamed, Abdul Wahid; Koggalage, Ravindra In this paper, a method to create an application which is competent of replacing the traditional input device (mouse) by using human facial features is proposed. Distinctively, using real time videos of the user's face extracted from the video sequence obtained using an off-the-shelf web-camera. It can be applied as an optional input source for those who cannot use their hands due to disabilities or patients who cannot use their hands. In the proposed technique, a method that combines both feature-based and image-based approach is used. The fundamental approach for detection is fast extraction of face candidates using Six-Segmented Rectangular (SSR) filter and then pass them to Support Vector Machine for face verification. In face tracking, the patterns of between-the-eyes are tracked with update template matching. A window that has the feature's template size is scanned over the Region of Interest (ROI) and then calculates the Sum of Squared Difference between a frame that has the feature's template and the current frame. Experiments show that 90% of the system behaves satisfactory for a web-camera at frame rate of 15 fps with the image resolution of 320 times 240 frame size. The system consumes little amount of CPU resources allowing other processors to run smoothly.

2007-01-01T00:00:00Z