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Search Results: 1 - 10 of 542 matches for " Fragkiadakis Alexandros "
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Ubiquitous robust communications for emergency response using multi-operator heterogeneous networks
Fragkiadakis Alexandros,Askoxylakis Ioannis,Tragos Elias,Verikoukis Christos
EURASIP Journal on Wireless Communications and Networking , 2011,
Abstract: A number of disasters in various places of the planet have caused an extensive loss of lives, severe damages to properties and the environment, as well as a tremendous shock to the survivors. For relief and mitigation operations, emergency responders are immediately dispatched to the disaster areas. Ubiquitous and robust communications during the emergency response operations are of paramount importance. Nevertheless, various reports have highlighted that after many devastating events, the current technologies used, failed to support the mission critical communications, resulting in further loss of lives. Inefficiencies of the current communications used for emergency response include lack of technology inter-operability between different jurisdictions, and high vulnerability due to their centralized infrastructure. In this article, we propose a flexible network architecture that provides a common networking platform for heterogeneous multi-operator networks, for interoperation in case of emergencies. A wireless mesh network is the main part of the proposed architecture and this provides a back-up network in case of emergencies. We first describe the shortcomings and limitations of the current technologies, and then we address issues related to the applications and functionalities a future emergency response network should support. Furthermore, we describe the necessary requirements for a flexible, secure, robust, and QoS-aware emergency response multi-operator architecture, and then we suggest several schemes that can be adopted by our proposed architecture to meet those requirements. In addition, we suggest several methods for the re-tasking of communication means owned by independent individuals to provide support during emergencies. In order to investigate the feasibility of multimedia transmission over a wireless mesh network, we measured the performance of a video streaming application in a real wireless metropolitan multi-radio mesh network, showing that the mesh network can meet the requirements for high quality video transmissions.
The Nature of Economic Turbulence: The Power Destructing Economies, with Application to Shipping  [PDF]
Alexandros M. Goulielmos, Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.95066
Abstract: Studying the history of “economic turbulence”, we ended up with the certainty that the statistical methods used so far, by economists, are unsuitable to model it. We have mainly the methods of Normal distribution and Random Walk in mind. Moreover, the picture of reality we get from time series depends on the time-frame of the data used… Different time-frame data, different reality… In addition, econometricians provided a whole family of econometric models to approach reality, starting in early 1980s, with “autoregressive models—AR” combined or not with MA (moving averages). But even its 1986 flagship, the GARCH, with its many variations, cannot cope with a number of characteristics, one of which is leptokurtosis (small alpha, higher peaks and long tails), though some argue that it can cater for outliers. Economic turbulence, low or high—despite its characterization by Science as rare—became frequent since 1987 (Black Monday)... In late 1990s e.g. the global financial system underwent 6 crises—which have been called “near turbulences”—over a number of countries, including Russia in 1998. The next turbulence will not be one generation apart—we reckon. This paper is an attempt to invite writers to write a “theory of economic turbulence”. Turbulence is a nightmare, which wakes people up suddenly, and unexpectedly, but it is something people wish to forget… till it strikes again: turbulence stroke in 1929 on (Black) Tuesday, then in 1987 on (Black) Monday and in end-2008, the Great Recession—on 29th September. In Black Monday stock markets around the world crashed losing a huge value in a matter of very short time (Hong Kong, Europe, and USA). The Dow fell ~23%. At that time OPEC collapsed in 1986 and the price of oil doubled… The dry cargo shipping sector entered a turbulent situation since 1989, which has been deteriorated since 2015 reaching finally an alpha equal to ~1.43 < 1.70 by 2035…
The Impact of an Environmental Educational Program of a School Garden on Pupils with Intellectual Disabilities—A Comparative Approach  [PDF]
Alexandros Stavrianos, Alexia Spanoudaki
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.34005
Abstract: The following research describes an attempt to combine environmental education through outdoor activities in Special Education. It examines the use of a school garden as a learning environment in Special Education by looking at the stances and opinions of 10 pupils, diagnosed with mild to moderate intellectual disability, towards Environmental Education and prognoses barriers that may occur in the learning process. Specifically, the study focuses on the skills and subject knowledge those students have cultivated through a project called “School Garden”, highlighting the ideas pupils have, regarding the position of environmental education in their school curriculum. Using descriptive statistical analysis to compare the two groups of pupils, this research suggests the further practice of Environmental Education in Special Education. The research took place in two Special Education Primary Schools in Greece, while the data were collected using semi-structured interviews. The main conclusions of the research were that students who participated in their school’s environmental educational program seem to be more familiarized with a range of concepts related to the environment and possess skills linked directly to Environmental Education in relation to their peers that did not engage in the project, while pupils who participated in the “School Garden”, unlike their peers, perceived outdoor activities of their school as part of the learning process, in formal education. This study proposes further research to take place in the area of Environmental Education and Special Education.
The Contribution of Management Commentary Index (Ma.Co.I) in Annual Banking Reports (ABR) and the Chronicle of the Great Greek Crisis  [PDF]
Alexandros Garefalakis, Augustinos Dimitras
Theoretical Economics Letters (TEL) , 2016, DOI: 10.4236/tel.2016.65103
Abstract: The research explores the extent to which the implementation of International Financial Reporting Standards (IFRS) in the Greek banking sector has affected its financial and narrative reporting between the periods prior (2002-2004) and after (2005-2010) the implementation of the IFRS. In particular, we examine the relation between Price per Share (P), Earnings per Share (EPS) and the Book Value (BV) per share using data from listed banks of Athens Stock Exchange (ASE). Further, the change of the narrative reporting quality of the Greek banking sector is studied along with the key financial indicators trends between the two above periods. Moreover, we investigate the disclosure quality of narrative information of annual reports for the period after the Greek financial crisis (i.e. from 2008 to 2010). Finally, we assess the relation between the key financial indicators and Management Commentary (MC). The findings indicate a positive relationship between P, BV and EPS after the first period of IFRS adoption (i.e. from 2005 to 2007). In addition, we report that MC has been considerably improved in the same period, while a positive impact in the key financial Indicators has been observed. Furthermore, empirical evidence specifies that Debt tends to be the most important indicator of Management Commentary. Finally, in the beginning of Greek crisis period the disclosure quality of narrative portion of annual reports are lower except. An important innovative characteristic of the above results is that the Management Commentary Index (Ma.Co.I) is able to measure the actual quality of Annual Banking Reports (ABR) and provide a reliable and unique tool for the investors.
The “Kondratieff Cycles” in Shipping Economy since 1741 and till 2016  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.82022
Abstract: The theory of “long waves”, due to Russian economist Kondratieff, which appeared in the 1920s, is presented, and a search whether a similar pattern exists in shipping economy since 1741 is made. Kondratieff believed in the existence —inherent in capitalistic system—of at least 21/2 long cycles of a non-random duration of 54 years on average since 1780—with 27 years up and 27 years down. As we showed—using mainly a diagrammatic analysis—economic history verified—till end-2008—Kondratieff’s theories, though it rejected his claimed harmony in their duration. Given that history may be repeated, and only for this is useful, we tried a nonlinear dynamic forecasting model for dry cargo shipping market for 20 years ahead using “Rescaled Range Analysis” and “Kernel Density estimation method” and found that cycles are here to stay. Presented also is the merger-waves in capitalistic economies since 1893— a factor ignored by Joan Robinson in her macroeconomic analysis for the trade cycle in the 1960s. Further we confirm/reject previous analysts, including Schumpeter, who claimed: 1) that technology has created the long shipping cycles (since 1741); 2) that the impact of major wars since 1740 on freight markets was another cyclical cause; 3) that economies of scale play the significant role and 4) that the impact of risk emerged at a certain time though this outcome was too ignored by macroeconomists. The paper “discovered” the secular shipping cycles of a total duration of 139 years using the proper extra-long time data. This means that the discovery of unknown cycles is a matter of data’s longevity. We have also verified Kondratieff’s cycles—when data were divided in 3 separate technological periods: 1741-1871; 1872-1947 and 1947-today, but lasting longer i.e. 58 years on average. We saw that the great gift of capitalism, which is the “free will”, is to be accompanied by “rationality”, and by a deep knowledge of how capitalistic system functions—a warning placed by Kondratieff a century ago—so that to avoid crises like that at end-2008; also globalization has to be used for the benefit of all nations. This paper indicated new tools: the “Joseph effect”—for cycles and the “Hurst exponent” for
Strategies in “Shipping Business Management”  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.810083
Abstract: The paper deals with the tactics and strategies applied by global shipping companies. During current depression in the dry cargo sector, shipowners adopted two tactics: 1) to survive and 2) look after opportunities. Shipowners are mostly reactive-managers and apply Porter’s strategy of cost leadership mainly through economies of scale, cutting-down fleet’s average age as well total cost. This has been applied in the 1986 depression and in 2016 one. A short history of shipping business management showed a heavy reliance of managers on larger ships (par excellence up to 1973; and till today in a lesser degree). This needed 3 actions: 1) planning, 2) improved decision-making and 3) knowledge of finance.
The Great Achievement of Greek-Owned Shipping (1946-2017) and Keynes’ Animal Spirits  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.810082
Abstract: The Greek-owned Shipping’s great achievement since 1946, time when ~100 liberties acquired, is presented. It lies in the disproportion between a large global fleet and a small national seaborne trade. We also presented the 1300 years historical link between 21 Greek islands, and at least 31 great ship owners; kinship ties created by living in the same island, and… by marriages among fleet owners; the common participation in the ship capital of the ship owner and of his crew (συμπλοιοκτησiα = common ownership). The causes shown were 1) international and 2) national: 1) Greeks were cross-traders; the shipping policy of oil companies favored them; the seaborne trade expansion too.
The Myths about Forecasting, Business Cycles and Time Series, Which Prevent Economists to Forecast: With an Application to Shipping Industry  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2017, DOI: 10.4236/me.2017.812097
Abstract: People did not forgive economists for not forecasting the two great depressions. Especially the second one in end-2008which followed the 1929-1933 Great Depression (starting on 29/10/1929: the Black Tuesday). Keynes in 1936, wrote a book on economics of depression, and showed the way how full employment—through marginal efficiency of capital—can be achieved. He was bypassed by: his death (1946) and his disciples’ efforts to model economic growth (Harrod, 1939 and Domar, 1946). Progress in capitalistic economies cannot be achieved…without Keynes’ animal spirits. The wrong beliefs of my fellow economists, which we called them myths for sensation, were showed: myths about business cycles, time series and forecasting. Though in the long run we are all dead, economic history…remembers. The trade cycletheory, which eventually became business cycle, was in scientific focus from 1907 to 1941, and then
Linear and Nonlinear Strategic Management: With Applications to Shipping  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.91007
Abstract: The strategies—corporate, competitive and current—and the “effective leadership”, provided by linear management—all in all 22—were briefly presented with an application to shipping industry, like BCG matrix, and growth, as well as how to create and maintain a competitive advantage. Moreover, the essential strategies/functions of a shipping company were too presented with the prime emphasis to timing of shipping decisions. In shipping, management, as showed, is done by distance. Nonlinear management strategies showed next and the full Cartesian diagrams-phase spaces—of 3 companies— one in shipping—were used to discover the level of chaos in their business activities. A further tool has been used from nonlinear management: the “span of management” vis-à-vis the well-known “span of control”. We have showed that both top maritime countries and top shipping companies pursue the “growth strategy in a related industry” (with same knowhow). Some countries did it better, like Greece and Germany. “Growth strategy” has been accompanied by economies of scale and a lower service cost. We showed also that a growth strategy has to be moderated by: 1) forecasting that demand will be there, when ships are delivered; 2) that liquidity is secured, even in a slump, where banks and stock exchanges turn their backs to shipping, 3) the fact that prices of ships—new or 2nd hand—were indeed at rock bottom and that the 1st-best or 2nd best timing has been applied and 4) that company’s investments did not influence total supply so that to dampen markets. A mention on generic competitive strategies has been carried out and especially differentiation issue of products and services, but not pursued much as shipping has homogeneous services.
Time and Equilibrium: 2 Important, But Invisible, Concepts of Economics, with Application to Shipping Industry  [PDF]
Alexandros M. Goulielmos
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.93035
Abstract:

As the World built, time established. Economists, however, put the “time” in the ceteris paribus basket, i.e. outside demand, supply and price. Moreover, Newton was mistaken in assuming that time flows independently. We saw that since the establishment of analysis, one science borrowed from the other, and economics borrowed from Physics: equilibrium, continuitywhere nature does not make leapsas well as Adam Smith’s invisible hand; in

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