Suchergebnisse

Relevance of the dissertation is determined by the object of research – the influence of logistical factors on transport flows distribution. The growth of world economics, business globalization, progress in technology skills extends the distances between geographical points of raw materials resources, manufacturers and consumers. Due to the membership in the European Union (EU) Lithuania has got new opportunities for international trade growth, and all the Eastern Baltic countries have become the buffer region for the EU trading with the countries of the Eastern Europe and Asia. A proper transport policy and infrastructure development would increase significantly the GNP in warehousing, transport and distribution sectors. Forecasting of potential transport flows according to logistical requirements of freight suppliers is most important for transport network optimization. Scientific problem. Contemporary transport engineering theory approaches the peculiarities of transport flows formation too narrowly, only as an analysis of internal factors determining freight flows. There is no analysis of external factors. Many researchers assume that transport flows are determined only by the existing transport network and its characteristics. Other researchers consider transport flows as a result of logistic elements only. The estimating of internal and external logistical factors provides a possibility to forecast the transport flows. Aim of the research is to create a model of logistical factors influence on transport flows distribution. Seeking to meet this aim, the author of the dissertation has solved the following tasks: 1. To make an analysis of the theory provided by Lithuanian and foreign researchers concerning the common interaction of logistics and transport, as well as to point out the advantages and disadvantages in the approaches and hypotheses of many authors, and to propose own conclusions. 2. To create a model of logistical factors and their indicators, which determine transport flows distribution in the transport network. 3. To make empirical research of indices of logistical factors in Lithuanian case. Scientific novelty of the research 1. The analysis of the research level of the scientific problem shows a very narrow theoretical view of determining transport flows. Many authors analyze internal factors only and do not estimate logistical needs of consignors and consignees. 2. The created new models determine transport flows and freight flows in transport network by internal and external specific logistical factors as well. 3. The results of empirical research of external factors confirm the created new models and provide a new interpretation and theoretical view of regularities of freight flows formation. Direct influence on basic transportation process characteristics and control is exercised by clients of transport companies. The basic attitudes for defending 1 The advantages and disadvantages of approaches of numerous researchers on logistic and transportation functions. 2 The models determining distribution of transport flows according to logistical factors. 3 The conclusions of empirical research of logistical factors' influence in Lithuanian case. The significance of the research. Theories proposed by many authors on transport and logistic functioning and interaction are analyzed, and a new point of theoretical view is given. The created models would be fit for forecasting of transport flows and planning of investments in transport infrastructure. The models would help the government, transport and logistics companies to make strategic decisions for development projects. Results of empirical research, which prove theoretical models are important for transport and logistic service providers and their customers for better common understanding and common activities. Methodology of the research is based on regression and correlative analysis, forecasting, as well as on market survey and mathematical modeling. Approbation of the work. Main theses of the dissertation were approbated in 3 scientific published works and 14 scientific conferences papers. Dissertation's structure. The work consists of introduction, three chapters, conclusions and a list of literature (123 scientific works). The amount of the work is: 108 pages, 61 figures and 20 tables. The work includes 6 appendixes. Conclusions The theoretical analysis of logistics influence on transport flows distribution concepts by many researchers, the mathematical modeling of transport flows determination factors and empirical research to give the following conclusions: 1. Many scientists explore logistics and transport by different concepts, however there are no special investigations of logistical impact on transport flows distribution in their works. The analysis of scientific works shows a dual aspect of transport flows distribution. The first theory maintains that technological engineering solutions determine transport flows; the second theory considers that they are determined by logistical factors such as: 1) added value; 2) minimization of logistics costs; 3) customer service. 2. The supporters of technological approach focus the attention on mathematical modeling of freight flows in transport network, nodes and links, as well as logistical chains. According to this point of view, physical characteristics of links and nodes only give possibility to solve the task of freight flows distribution. The scientific problem is that physical characteristics do not suffice for the right solution of this task. It is important to find and estimate external logistical factors. 3. It is important to estimate that transport flows formation is determined in long-term period according to the requirements of manufacturers, wholesalers, retailers and consumers. The trade centralization is one of the basic elements in formation of logistical channels and distribution centers, and transport flows of course. 4. The mathematical model of transport flows distribution is created here. The model gives peculiarities of freight flows distribution according to estimation of economical, juridical and physical parameters of nodes and links. If a logistical subsystem of the given sub-region does not constitute the entire goods traffic channel from the consignor to the consignee, but it is a constituent part of the entire logistical channel from the consignor to the consignee, then the flow traffic goods through that sub-region will be dependent not only on the characteristics of the logistical channel existing in the sub-region's logistical system, but it will also depend on other regions, the logistical systems of which are involved in the common logistical channel. The minimization of the characteristics of any element may cause the minimization of the characteristics of the entire logistical channel as well as the loss of its competitive abilities. 5. The model of shipment grouping according to peculiarities of transport flows and logistic requirements is created. The model enables the estimating of characteristics of freight origins and destination points and forecasting of grouped shipment routes. 6. The survey shows dual approach to transport flows distribution as well as theoretical analysis. Transport flows are distributed according to logistic strategy of transport service consumers and technological solutions, and implementations of providers as well. The survey demonstrates that transport companies are not only 'sellers' or 'providers' of transport services. They are logistical partners of transport service consumers. The strategic partnership of trading and transport companies determines in many cases the formation of transport flows in Lithuania. According forecast of 5 % yearly trade growth, freight volume by road and rail in Lithuania will increase to 133.6 million tons in year 2015. 7. The basic logistical factors determining the distribution of transport flows in Lithuania according to the survey are these: geography of consumers markets, geography of basic transport nodes, structures of logistical channels, perspective of urban development, shortest paths, political and anti-criminal security of transit, grouping of goods, national factor.

Relevance of the research problem. Sport is a value of every nation, which includes the system of physical, spiritual and cultural education, sports achievements, scientific knowledge, international communication (Karoblis, 2005). High level sport is inseparable from competitive activities, the pursuit of sports results (Hargreaves & MacDonald, 2000; Karoblis, 2005). The special training of athletes in the chosen sports is a part of general education of personality, which has a close connection with social, educational, political, economic issues of humanity development (Johnson et al., 2007). The athlete training process is a multi-year educational process of a specific structure and organizational form, which develops physical characteristics of an athlete, determines his activity, behavior, independence and responsibility, promotes to achieve excellent results. However, optimization of athlete training technology, construction of training system and its filling with full content still have the greatest impact on the improvement of sports results (Bompa & Buzzichelli, 2018; Karoblis, 2005; Платонов, 2004). Management of high-performance athlete training is related to prognostication, individual model characteristics of sport fitness, general and special load ratio, search for new effective directions of workout methodology, modeling of competition activity indicators, workout process planning, competition program conclusion, sport training adjustment (Karoblis, Raslanas, Steponavičius, 2002). Track-and-field athletics is integral sports that combine cyclic and acyclic exercise competitions: running, throws, vertical and horizontal jumps (Armonavičius, 1995). Short distance running is one of the most prestigious track-and-field athletics competitions. An exceptional short distance motor feature is the maximum intense activity of the whole body, especially the nervous and muscular systems, lasting from 0.1 to 40–50 s (Stanislovaitis et al., 2008). The ever-improving sports results reveal new human mental and physical abilities, vast resources of the body that could not even be dreamed of before. The organization of exercise, methodology, their scope and intensity, their combination with the means of recovery according to the main laws of phenotypic adaptation form the basis for the training of high-performance athletes (Платонов, 2004; Stonkus, 2000; Issurin, 2008; Krylovas, Kosareva, Dadelienė, & Dadelo, 2020). The particularity of the sport is based on competition. The results recorded in sport receive global recognition and become a true human achievement standard. In the world, they are constantly progressing, promoting the development of the sport community, therefore the greatest human intellectual and material resources are directed to the training of high-performance athletes (Skernevičius, 2015; Krylovas, Kosareva, Dadelienė, & Dadelo, 2020). However, the results of a research conducted by scientists showed that over the past nearly 20 years, elite athletes, including Olympic, world champions and prizewinners, have achieved personal best results in key competitions of the season by only in 50 percent cases (Yakimovich & Ovchinnikov, 2016). This shows that the opinion that contemporary coaches are high-performance and knowledgeable in the training of elite athletes and immaculately control and manage the process of sport training of athletes is not sufficiently substantiated. It has been established that the development of high-performance sprinters depends on many factors, the most important of which is the directionality of the training process, its management, taking into account the individual characteristics of the athlete's body adaptation to workout and competition loads (Stanislovaitis, 2008; Бондаренко, 1999; Нбанекова, Филин, 1995). The training of sprinters and their competitive activities have been extensively studied not only by foreign (Smith, 2005; Doscher, 2009; Kale & Bayrak, 2009; Prins, Murata, Derenne, Morgan, & Solomon, 2010; Dickin, Reyes, & Dolny, 2009; Nelson, Landin, Young, & Schexnayder, 2008; Eikenberry, Mcauliffe, Welsh, Zerpa, Mcpherson, & Newhouse, 2008; Oзoлин, 1986), but also by Lithuanian sport scientists (Stanislovaitis, 2008, 2006, 2005; Grūnovas, 2006; Butkus, 2006, 1995; Skurvydas, 1999, 2003; Bradauskienė, 2006). Although the world record of female sprinters in a 100 m distance is quite high (10.49 s), the search for new training methods and their application in the process of female sprinter workouts continues. Scientists are not only analyzing and evaluating existing workout methodological tools, but also looking for new methods for an advanced sprinter training process. Thus, in search of new methods to increase running speed, through more research and the application of the latest training technologies, methods can be discovered to help athletes to become faster and to develop a running speed, which has never been achieved before. Recently, in a 100 m running, as in many track-and-field athletics competitions, the results of athletes are progressing rapidly. That progress depends heavily on the selection of talented athletes, scientifically and practically sound and effective workout methodologies, the selection and application of remedial measures, the material compensation of athletes, which greatly increases motivation of athletes, and etc. Therefore, in order to achieve good results and prizes in high rank competition in contemporary sport, it is necessary to know the peculiarities of the application of training methodology, to properly select the most important starts of the annual training cycle, taking into account all conditions at the place and time of competition. An athlete and a coach must not only follow the innovations of training methodology, science and medicine, but also look back, be able to analyze his own results and the results of athletes, who have shown significant results theretofore, the peculiarities of workout tools and methods applied by them, the reasons for successful and unsuccessful starts, and then all this to apply to the management of his own training process. Discovering, revealing and learning about new technologies through the theory and didactics of sport workout is the most important function of sport science (Mester, 2003), and it is important for a coach to be able to use scientific results and recommendations, be insightful and be able to successfully model the training of elite athletes (Karoblis, Raslanas, Poteliūnienė, Steponavičius, Petkus, & Žilinskienė, 2011). The purposeful training of female sprinters and the search for effective technologies in order to increase the maximum running speed become a scientific problem. The presented scientific problem is relevant for the following reasons: ● It is important to analyze the change in results in terms of age and to determine the age, at which the highest results are achieved; ● It is important to research and theoretically substantiate, which components determine the sports result in short distance running; ● To research the effectiveness of training measures in order to increase maximum running speed; ● The contribution of running at maximum speed to the sports result in a 100 m run has not been sufficiently researched; ● It is important to establish criteria that affect the progress of athletes' mastery and the change of sport performance. Hypothesis. It is likely that sports results of female sprinters are not improving due to the integrated and concentrated training models applied separately. A universal speed training model is more effective. Object of the research is the process of female sprinter training. Aim is to identify the peculiarities of optimizing the training of high-performance female sprinters. Objectives of the research: 1. On the basis of the data of the theoretical analysis of scientific sources, to reveal the change of the results of high-performance female sprinters in terms of age. 2. To perform a comparative analysis of the preparation of high-performance female spriners for the Athens, Beijing, London and Rio Olympic Games. 3. To review the technologies of sports training of female sprinters and to examine the factors influencing their results. 4. To determine the effectiveness of a universal method for training the speed of high-performance female sprinters. 5. To reveal/identify the opinion of high-performance female sprinters about the factors determining their training system. Theoretical and practical significance Researching the structure and content of sports training for female sprinters of different ages and sports mastery, analyzing the change of sports results in terms of age, evaluating workout methods, running speed components, the provisions for effective running speed increase were identified: ● Running speed is determined by the speed of muscle contraction, the length of leg support, the frequency of steps, and the sports result in a 100-meter run depends mainly on the maximum running speed. ● In order to improve the results of the maximum running speed of female sprinters, it is important to apply a universal, combined method in the workout process, running with weight and stretching with an elastic band. These provisions are relevant to the theory and practice of female sprinter training. The results of the study can be used in the development of training programs for sports schools and high-performance female sprinters. CONCLUSIONS 1. The age for achieving the best personal result in the women's 100 m running competition is 24.69 ± 3.27 year. The best Lithuanian sprinter L. Grinčikaitė-Samuolė achieved her best result in this running competition at the age of 25 – 11.19 s. At the beginning of their athletic career, American sprinters had the highest running scores and dominated until the age of 17, however later is observed leadership of the Caribbean Region female sprinters up to the age of 35. The results of European sprinters were average in almost all age groups. 2. Analysis of the four Olympic Games revealed a significant improvement in the results of the 100 m running and starting reaction speed (p < 0.05). In order to get to in the 100 m running final, athletes should run an average of 10.96 ± 0.03 s, and to become the prizewinners of the competition – 10.86 ± 0.08 s. Sprinters become the prizewinners of the 100 m run at the age of 25.42 ± 3.18 year. 3. Lithuanian female sprinters lose to the best sprinters of Europe and the world in the competition requiring the maximum running speed – 40 m in acceleration (11.99 %). The best Lithuanian sprinter L. Grinčikaitė-Samuolė reduces this difference to 4.05 % in the 100 m running distance, the gap between Europe's and the world's best female sprinters is gradually declining due to improved European sprinters' maximum running speed results. 4. The resisted/assisted running method is the most effective way to increase the running speed and starting acceleration, as this speed training method significantly improves the values of step length and support duration than running normally. 5. High-performance female sprinters lack attention to an important component of training – psychological training – in the process of their sports training. It was found out that their sports training and improvement of results are more influenced by external (monetary prizes, premiums) than internal motives (desire to improve results, honor to represent their country). A coach's personality also has impact. The coach is valued not only as a specialist, but distinguishing his personal qualities, such as sincerity, friendliness, motivation, promotion is considered an integral part of the training process.

Relevance of the research problem. Sport is a value of every nation, which includes the system of physical, spiritual and cultural education, sports achievements, scientific knowledge, international communication (Karoblis, 2005). High level sport is inseparable from competitive activities, the pursuit of sports results (Hargreaves & MacDonald, 2000; Karoblis, 2005). The special training of athletes in the chosen sports is a part of general education of personality, which has a close connection with social, educational, political, economic issues of humanity development (Johnson et al., 2007). The athlete training process is a multi-year educational process of a specific structure and organizational form, which develops physical characteristics of an athlete, determines his activity, behavior, independence and responsibility, promotes to achieve excellent results. However, optimization of athlete training technology, construction of training system and its filling with full content still have the greatest impact on the improvement of sports results (Bompa & Buzzichelli, 2018; Karoblis, 2005; Платонов, 2004). Management of high-performance athlete training is related to prognostication, individual model characteristics of sport fitness, general and special load ratio, search for new effective directions of workout methodology, modeling of competition activity indicators, workout process planning, competition program conclusion, sport training adjustment (Karoblis, Raslanas, Steponavičius, 2002). Track-and-field athletics is integral sports that combine cyclic and acyclic exercise competitions: running, throws, vertical and horizontal jumps (Armonavičius, 1995). Short distance running is one of the most prestigious track-and-field athletics competitions. An exceptional short distance motor feature is the maximum intense activity of the whole body, especially the nervous and muscular systems, lasting from 0.1 to 40–50 s (Stanislovaitis et al., 2008). The ever-improving sports results reveal new human mental and physical abilities, vast resources of the body that could not even be dreamed of before. The organization of exercise, methodology, their scope and intensity, their combination with the means of recovery according to the main laws of phenotypic adaptation form the basis for the training of high-performance athletes (Платонов, 2004; Stonkus, 2000; Issurin, 2008; Krylovas, Kosareva, Dadelienė, & Dadelo, 2020). The particularity of the sport is based on competition. The results recorded in sport receive global recognition and become a true human achievement standard. In the world, they are constantly progressing, promoting the development of the sport community, therefore the greatest human intellectual and material resources are directed to the training of high-performance athletes (Skernevičius, 2015; Krylovas, Kosareva, Dadelienė, & Dadelo, 2020). However, the results of a research conducted by scientists showed that over the past nearly 20 years, elite athletes, including Olympic, world champions and prizewinners, have achieved personal best results in key competitions of the season by only in 50 percent cases (Yakimovich & Ovchinnikov, 2016). This shows that the opinion that contemporary coaches are high-performance and knowledgeable in the training of elite athletes and immaculately control and manage the process of sport training of athletes is not sufficiently substantiated. It has been established that the development of high-performance sprinters depends on many factors, the most important of which is the directionality of the training process, its management, taking into account the individual characteristics of the athlete's body adaptation to workout and competition loads (Stanislovaitis, 2008; Бондаренко, 1999; Нбанекова, Филин, 1995). The training of sprinters and their competitive activities have been extensively studied not only by foreign (Smith, 2005; Doscher, 2009; Kale & Bayrak, 2009; Prins, Murata, Derenne, Morgan, & Solomon, 2010; Dickin, Reyes, & Dolny, 2009; Nelson, Landin, Young, & Schexnayder, 2008; Eikenberry, Mcauliffe, Welsh, Zerpa, Mcpherson, & Newhouse, 2008; Oзoлин, 1986), but also by Lithuanian sport scientists (Stanislovaitis, 2008, 2006, 2005; Grūnovas, 2006; Butkus, 2006, 1995; Skurvydas, 1999, 2003; Bradauskienė, 2006). Although the world record of female sprinters in a 100 m distance is quite high (10.49 s), the search for new training methods and their application in the process of female sprinter workouts continues. Scientists are not only analyzing and evaluating existing workout methodological tools, but also looking for new methods for an advanced sprinter training process. Thus, in search of new methods to increase running speed, through more research and the application of the latest training technologies, methods can be discovered to help athletes to become faster and to develop a running speed, which has never been achieved before. Recently, in a 100 m running, as in many track-and-field athletics competitions, the results of athletes are progressing rapidly. That progress depends heavily on the selection of talented athletes, scientifically and practically sound and effective workout methodologies, the selection and application of remedial measures, the material compensation of athletes, which greatly increases motivation of athletes, and etc. Therefore, in order to achieve good results and prizes in high rank competition in contemporary sport, it is necessary to know the peculiarities of the application of training methodology, to properly select the most important starts of the annual training cycle, taking into account all conditions at the place and time of competition. An athlete and a coach must not only follow the innovations of training methodology, science and medicine, but also look back, be able to analyze his own results and the results of athletes, who have shown significant results theretofore, the peculiarities of workout tools and methods applied by them, the reasons for successful and unsuccessful starts, and then all this to apply to the management of his own training process. Discovering, revealing and learning about new technologies through the theory and didactics of sport workout is the most important function of sport science (Mester, 2003), and it is important for a coach to be able to use scientific results and recommendations, be insightful and be able to successfully model the training of elite athletes (Karoblis, Raslanas, Poteliūnienė, Steponavičius, Petkus, & Žilinskienė, 2011). The purposeful training of female sprinters and the search for effective technologies in order to increase the maximum running speed become a scientific problem. The presented scientific problem is relevant for the following reasons: ● It is important to analyze the change in results in terms of age and to determine the age, at which the highest results are achieved; ● It is important to research and theoretically substantiate, which components determine the sports result in short distance running; ● To research the effectiveness of training measures in order to increase maximum running speed; ● The contribution of running at maximum speed to the sports result in a 100 m run has not been sufficiently researched; ● It is important to establish criteria that affect the progress of athletes' mastery and the change of sport performance. Hypothesis. It is likely that sports results of female sprinters are not improving due to the integrated and concentrated training models applied separately. A universal speed training model is more effective. Object of the research is the process of female sprinter training. Aim is to identify the peculiarities of optimizing the training of high-performance female sprinters. Objectives of the research: 1. On the basis of the data of the theoretical analysis of scientific sources, to reveal the change of the results of high-performance female sprinters in terms of age. 2. To perform a comparative analysis of the preparation of high-performance female spriners for the Athens, Beijing, London and Rio Olympic Games. 3. To review the technologies of sports training of female sprinters and to examine the factors influencing their results. 4. To determine the effectiveness of a universal method for training the speed of high-performance female sprinters. 5. To reveal/identify the opinion of high-performance female sprinters about the factors determining their training system. Theoretical and practical significance Researching the structure and content of sports training for female sprinters of different ages and sports mastery, analyzing the change of sports results in terms of age, evaluating workout methods, running speed components, the provisions for effective running speed increase were identified: ● Running speed is determined by the speed of muscle contraction, the length of leg support, the frequency of steps, and the sports result in a 100-meter run depends mainly on the maximum running speed. ● In order to improve the results of the maximum running speed of female sprinters, it is important to apply a universal, combined method in the workout process, running with weight and stretching with an elastic band. These provisions are relevant to the theory and practice of female sprinter training. The results of the study can be used in the development of training programs for sports schools and high-performance female sprinters. CONCLUSIONS 1. The age for achieving the best personal result in the women's 100 m running competition is 24.69 ± 3.27 year. The best Lithuanian sprinter L. Grinčikaitė-Samuolė achieved her best result in this running competition at the age of 25 – 11.19 s. At the beginning of their athletic career, American sprinters had the highest running scores and dominated until the age of 17, however later is observed leadership of the Caribbean Region female sprinters up to the age of 35. The results of European sprinters were average in almost all age groups. 2. Analysis of the four Olympic Games revealed a significant improvement in the results of the 100 m running and starting reaction speed (p < 0.05). In order to get to in the 100 m running final, athletes should run an average of 10.96 ± 0.03 s, and to become the prizewinners of the competition – 10.86 ± 0.08 s. Sprinters become the prizewinners of the 100 m run at the age of 25.42 ± 3.18 year. 3. Lithuanian female sprinters lose to the best sprinters of Europe and the world in the competition requiring the maximum running speed – 40 m in acceleration (11.99 %). The best Lithuanian sprinter L. Grinčikaitė-Samuolė reduces this difference to 4.05 % in the 100 m running distance, the gap between Europe's and the world's best female sprinters is gradually declining due to improved European sprinters' maximum running speed results. 4. The resisted/assisted running method is the most effective way to increase the running speed and starting acceleration, as this speed training method significantly improves the values of step length and support duration than running normally. 5. High-performance female sprinters lack attention to an important component of training – psychological training – in the process of their sports training. It was found out that their sports training and improvement of results are more influenced by external (monetary prizes, premiums) than internal motives (desire to improve results, honor to represent their country). A coach's personality also has impact. The coach is valued not only as a specialist, but distinguishing his personal qualities, such as sincerity, friendliness, motivation, promotion is considered an integral part of the training process.