Volume 4, Issue 1, 2014

By | August 13, 2018

A New Edge Detector in CT Scan Images Using Gradient of Weibull Distribution

Wafaa Kamel Al-Jibory, Department of Mathematics and Computer Science, Faculty of Science, Beirut Arab University, Beirut –Lebanon.
Ali El-Zaart, Department of Mathematics and Computer Science, Faculty of Science, Beirut Arab University, Beirut –Lebanon.

Abstract— CT Scan is based on the x-ray principal: as x-rays pass through the body they are absorbed or attenuated (weakened) at differing levels creating a matrix or profile of x-ray beams of different strength. This x-ray profile is registered on film, thus creating an image. In the case of CT. Image processing uses for detecting for objects of CT images. Edge detection; which is a method of determining the discontinuities gray level images, is a very important initial step in Image processing. Many classical edge detectors have been developed over time. Some of the well-known edge detection operators based on the first derivative of the image are Roberts, Prewitt, Sobel which are traditionally implemented by convolving the image with masks. Also Gaussian distribution has been used to build masks for the first and second derivative. However, this distribution has a limit to only symmetric shape. This paper will use to construct the masks. The Weibull distribution which was more general than Gaussian because it has symmetric and asymmetric shape. The constructed masks are applied to images and we obtained good results.

Keywords- Edge detection; Image processing; Weibull Distribution; Gradient; CT scan images.

Cost Information Exchange With Other Supply Chain Firms, The Case Of Egypt

Mohamed Elgibale, R. Safwat
Faculty of Commerce, Beni Suef University – Egypt.

Abstract— While exchanging cost information in supply chain (SC) context has been received as a crucial process supporting SC partnership and collaboration, a firm may avoid exchanging cost information with other SC parties or outside its boundaries fearing from an opportunistic use of this information from the other parties seeking their self-interest. The research had analyzed the effect of three factors affecting firm’s willingness to exchange cost information with other SC parties; trust power, and the type of cost accounting system applied in the firm. And the effect of cost information exchange upon the efficiency and productivity of the firm’s cost system and the whole SC. The research results based upon a survey study conducted in three sectors of pharmaceutical
industry (governmental, private, and multi-national) along with applied study in two leading multi-national firms, The sample size of the survey was 140 with a response rate of 79.29%.The results of the research showed that there is a partial rather than full exchange of cost information in the society surveyed and that it would be difficult to exchange cost information even with threatening sanctions against opportunistic behavior without the existence of mutual trust.

Keywords- Exchanging cost information; trust; power; cost accounting system productivity and efficiency; SC productivity;
efficiency.

 

 

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