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( Vassilis Marinos ),( Trevor Carter ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The necessity for reliable estimates of strength and deformation characteristics of the rockmasses on which or within which engineering structures are to be created, after the significant advances that have occurred in recent years in numerical modelling capability, is essential. The development of these tools has to be comparative with the improvement in geologic base data. GSI characterization, linked with Hoek-Brown strength determination as a basis for modelling has been widely adopted by engineers and geologists involved in rock engineering design. Back-analyses of tunnels, slopes and foundation behaviour using GSI and its reliable application in rock engineering designs attest to its reliability, however, greater understanding is needed in the definition of input constants, for establishing both GSI and intact rock properties. This need for improved evaluation, particularly from a geological perspective, is addressed. Geological processes of tectonism, weathering and alteration all affect GSI and are analysed based on real rockmass cases. Illustrations are given of how geological differentiation dictates variability in geotechnical properties of most common rocks. The need for geological definition of rockmass properties required as inputs into numerical analysis, constitutes one of the greatest reasons for application of the GSI chart, allowing characterization of even difficult-to-describe rockmasses. This chart allows selection of appropriate GSI ranges for any specific rock suite. Specific key engineering geological characteristics that differentiate igneous, metamorphic and sedimentary one from each other are highlighted through discussion of various example rock units (including gneisses, granites, ophiolites, limestones, schists, siltstones/mudstones/shales, and molassic and flysch formations).
Minimum Wage and Income Distribution in the Harris-Todaro Model
Vassilis T. Rapanos 중앙대학교 경제연구소 2005 Journal of Economic Development Vol.30 No.1
The purpose of this paper is to examine the effects of a change in the minimum wage on income distribution and employment in a developing economy. The basic framework of our analysis is the original Harris-Todaro model, in which the only factor that is intersectorally mobile is labor. We analyze the effects of a change in the minimum wage on income distribution, sectoral employment and unemployment, both in the framework of a small open economy, and with endogenous commodity-price changes. Our findings differ from the results of the existing literature and shed light on the complex interaction between the urban and the rural sector of a developing economy.
Papakostopoulos, Vassilis,Nathanael, Dimitris Occupational Safety and Health Research Institute 2021 Safety and health at work Vol.12 No.2
Background: In this study, the association of work and demographic characteristics with different traffic offenses committed by food delivery riders in Greece was examined. Previous research has identified various factors related to risky driving however, there is a need for exploring the complex interrelationship of work-related factors underlying risky driving behavior. Materials and Methods: A 2-items uestionnaire was used exploring delivery riders demographic characteristics, terms of employment, issues of concern during work and type of traffic offenses committed. In total, uestionnaires were analyzed using logistic regression in order to identify characteristics independently associated with serious traffic offenses, namely, red-light running and helmet non-use. Results: The analysis showed that: (i) typical health and safety measures had no effect on serious traffic offenses, (ii) young age was related to both offenses however (iii) different sets of work conditions were associated with reports of red-light running (i.e. low work experience, use of personal vehicle for work, and payment by hour) and helmet non-use respectively (i.e. intense work pace, high tip income per day and low concern about vehicle condition). Conclusion: The above findings provide evidence that serious traffic offenses are manifestations of underlying conflict experienced by the riders between safety and various performance criteria. Each one of the two offenses is related to different rider profiles aiming to satisfy different goals, namely, those mainly trying to maximize profit non-helmet users and those, mostly inexperienced ones, trying to cope with work pressure red light runners. Potential regulatory measures to alleviate risky practices are discussed.
RAPANOS, VASSILIS T. 한국국제경제학회 1991 International Economic Journal Vol.5 No.2
This paper exmines the effects of technological progress in the framework of a specific-factor variant of the "dependent economy" model. We analyse, first, the effects of technological progress on income distribution, and secondly, its effects on commondity prices, and the structure of production. Our model predicts that, services must be more expensive in the country with higher per capita GDP, and that labor productivity in manufactures is positively associated with the per capita income, etc. The model can also explain several other stylized facts of economic growth.
Kouloulias, Vassilis,Tolia, Maria,Tsoukalas, Nikolaos,Papaloucas, Christos,Pistevou-Gombaki, Kyriaki,Zygogianni, Anna,Mystakidou, Kyriaki,Kouvaris, John,Papaloucas, Marios,Psyrri, Amanda,Kyrgias, Geor Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.1
Background: The aim of the study was to determine whether the expression of baseline phosphorus (P) and magnesium (Mg) levels were prognostic in terms of stage and overall survival (OS) in newly diagnosed non-small cell lung cancer (NSCLC) and small cell lung cancer (SCLC) patients. Materials and Methods: Retrospectively, 130 patients were selected at the time of diagnosis oflung cancer (100 with NSCLC and 30 with SCLC), before the initialization of any chemo-radiotherapy. The median age was 67 (range 29-92). IA, IB, IIA, IIB, IIIA, IIIB and IV stages were present in 3, 4, 19, 6, 25, 8, and 65 patients, respectively. After centrifugation, the levels of serum P and Mg were measured using the nephelometric method/ photometry and evaluated before any type of treatment. Results: Higher than normal levels of P were found in 127/130 patients, while only four patients had elevated Mg serum values. In terms of Spearman test, higher P serum values correlated with either stage (rho=- 0.334, p<0.001) or OS (rho=-0.212, p=0.016). Additionally, a significant negative correlation of Mg serum levels was found with stage of disease (rho=-0.135, P=0.042). On multivariate cox-regression survival analysis, only stage (p<0.01), performance status (p<0.01) and P serum (p=0.045) showed a significant prognostic value. Conclusions: Our study indicated that pre-treatment P serum levels in lung cancer patients are higher than the normal range. Moreover, P and Mg serum levels are predictive of stage of disease. Along with stage and performance status, the P serum levels had also a significant impact on survival. This information may be important for stratifying patients to specific treatment protocols or intensifying their therapies. However, larger series are now needed to confirm our results.