Technological Educational Institute of Western Macedonia

About: Technological Educational Institute of Western Macedonia is a based out in . It is known for research contribution in the topics: Catalysis & Symplectic geometry. The organization has 291 authors who have published 522 publications receiving 7682 citations. The organization is also known as: TEI of West Macedonia & TEI of Western Macedonia.

Corporate Governance, Insider Trading, and Stock Returns in the Greek Technology Sector

Abstract: Insider trading and corporate governance have been two major interrelated issues that are of main concern in all capital markets around the world. This paper examines the effect that corporate governance characteristics have on the stock price reaction caused by insider trading announcements. Based on the event study methodology, we have examined 636 announcements of insider transactions of 14 companies in the Athens Stock Exchange technology sector, during 2007 and 2013, and selected corporate governance characteristics such as the identity of the insider, ownership structure, separation of ownership and control, and financial variables. Our findings suggest that there the identity of the insider, and especially the CEO, has an effect on the abnormal stock returns. Ownership structure and high levels of ownership concentration and control seem to have an effect in abnormal stock returns of the firms only in long periods of time after the announcement.

Integrating Total Quality Management Philosophy in Greek Higher Educational Institutions

Abstract: In the highly demanding contemporary environment, organizations, and more specifically higher education institutions, are expected to respond to constant changes and financial crises, by developing innovative practices and delivering quality products and services As quality and innovation are perceived to be sources of competitive advantage, the implementation of Total Quality Management (TQM) is suggested The TQM philosophy can be useful for Greek higher educational institutions, improving the quality of services provided

Towards a collaborative ranking mechanism for efficient and personalized internet search service provisioning

Abstract: The aim of this paper is, in accordance with efficient web search service operation objectives, to propose enhancements to the sophistication of the functionality that can be offered by search engine services A meta-search third-party result ranking mechanism is proposed, which is capable of adapting over the continuous changes that occur on the web, providing in parallel personalized information acquisition considering the user's navigation behaviour Transparency is achieved for both personalization and web evolution adaptation mechanisms, requiring virtually none effort from the user's part In essence, the proposed meta search engine rates, re-organises and combines the results acquired from search services for a specific user information resource request in accordance with a weighted combination of a performance related factor (tightly related to the ranking of the web result as given by the search engine service) and a reliability related factor (corresponding to the user satisfaction stemming from the specific web result that he/she browses), while the performance of each search engine with respect to adequately adapting to the web evolution is taken into account For the evaluation of the web results reliability, a collaborative reputation mechanism is utilized, which helps estimating their quality and predicting their future usability, taking into account their past performance in consistently satisfying user expectations A set of results indicative of the efficiency of our proposed scheme is provided The Internet search services used were Google, MSN and Yahoo!

Towards Efficient Trust Aware E-Marketplace Frameworks

Abstract: INTRODUCTION In the liberalised and deregulated e-marketplace some key factors for service providers’ success are the following. First, the efficiency with which services will be developed. Second, the quality level, in relation with the corresponding cost, of new services. Third, service providers’ reliability with respect to service provisioning. Fourth, the efficiency with which the services will be operated (controlled, maintained, administered, etc.). The aim of this paper is, in accordance with efficient service operation objectives, to propose enhancements to the sophistication of the negotiation functionality that can be offered by e-commerce systems in open competitive communications environments.

Environmental associations of heavy and trace elements concentrations in Sarigiol ground water coal basin area

Abstract: Ground water samples collected from 21 wells located in the hydrogeological, coal-bearing basin of Sarigiol, Western Macedonia, Greece have been analysed for determining trace elements concentrations. The water quality assessment reveals that the concentrations of heavy and toxic metals and trace elements are, for most of the samples; bellow the allowable limits specified by the existing regulatory framework. The trace elements As, Cd, Cu, Zn, V, Co, Be, B and Al are detected in very low concentrations, while Τi and Sn are detected in very low to negligible concentrations. The elements Pb, Hg, Ni, Mo, Crtot and Ba are present in low concentrations. This is also the case for Sr, Te and Bi. For these elements the legal framework does not specify allowable limits. Concentrations closed to or above the allowable limits have been determined for Sb and Tl. In addition, samples of water that have been collected from certain parts of Sarigiol basin show concentrations above the allowable limits for Al, Be, Ni, Cr, Sr and Se. However, the enrichment ratio, compared to the allowable limits determined by laws and regulations, is very low. Based on the results presented and evaluated in this contribution, it is concluded that adverse impacts to the human and natural environment are not probable. The water pumped from the wells of the area can be used safely for irrigation and water supply.