253 research outputs found
An innovative operation‐time‐space network for solving different logistic problems with capacity and time constraints
No full textThis work describes an innovative operation-time-space network that can be easily adapted to model different logistic problems involving time and space decisions. In the recent literature, different time-space networks have been proposed to deal with specific requirements of problems arising in the logistic and transportation fields. The proposed network is able to deal with different types of capacity and time constraints that characterized the most part of logistic problems. The article explains how to construct the operation-time-space network, how to model time and capacity constraints of different types; moreover, it presents an application of this network to solve a logistic problem arising in the rail-sea exchange node, that is the scheduling of port rail shunting operations. Other applications are briefly introduced. Finally, the well-known quay crane scheduling problem is modeled, thanks to the operation-time-space network; the related flow model is tested by using a benchmark suite available in the literature
Port Rail Shunting Optimization Problems
No full textThe work focuses on a particular section of the intermodal chain of freight transportation, which is the link between rail and sea transportation modes and happens in the maritime port area. Among this field, the study deals with the management of rail operations, called here rail shunting operations, that have to be performed in the port area.
Two optimization problems arises in this context. The first concerns the scheduling of the rail shunting operations, here called Port Rail Shunting Scheduling Problem (PRSSP). The second deals with the re-scheduling of the same operations in case of unpredictable events, here called Port Rail Shunting Re-Scheduling Problem (PRSRP). After a literature overview on the concerning studies, we concentrate on an innovative way to use the well known space-time networks as solution approach structure for both the above mentioned problems. The innovative structure has been called operation-time-space network and is deeply analyzed in a dedicated chapter.
A network flow model based on an operation-time-space network for solving PRSSP has been developed. It has been tested using random generated instances providing good results. The same model has been extended in order to solve PRSRP and it has been tested giving good results as well.
Finally, the models have been used to solve the real case of a port area located in Italy in order to test the applicability of the developed models to a real context. The tests have been executed using real data and provided good results confirming the possibility to apply the proposed approach in similar real problems
Optimization challenges and literature overview in the intermodal rail-sea terminal
No full textThis work focuses on a particular node of the intermodal chain of transportation, i.e. the maritime port area that represents the link between rail and sea transportation modes. Since this exchange node of the chain has not been addressed much yet, the aim of the present study is to provide a description of the process of rail operations in port area, to give an overview of the optimization challenges and to review the existing literature on it. The purpose of the paper is to attract the researchers attention on this particular intermodal node, where there is room for improvements
An optimization model to design a new cruise itinerary: the case of Costa Crociere
No full textThis work analyses the complex processes for the development of cruises' itineraries to offer on the market and proposes a mathematical model for determining a new itinerary maximizing revenues, customers satisfaction, while minimizing operative costs. This work represents one of the first attempt to apply optimization techniques to cruise shipping and has been realized in collaboration with Costa Crociere, a cruise company operating in Europe
Influence of physical activity at home and in community of older adults for fitness, mobility and life quality.
No full textInfluence of Physical Activity at Home and in Community of Older Adults for Fitness, Mobility and Life Quality The Author: VU Master of Rehabilitation programme the 2nd course student Asta Viskontaitė. Academic advisor: dr. Asta Mastavičiūtė, Vilnius University, Faculty of Medicine, Department of Rehabilitation, Physical and Sports Medicine. Key words: older, fitness, mobility, quality of life, physical activity. Goal of the research: To evaluate influence of physical exercises at home and in community of older adults for fitness, mobility and life quality. Research objectives: 1. To determine fitness, mobility and life quality of older adult; 2. To determine fitness, mobility and life quality of older adult after physical activity program; 3. To compare the results between the subjects who physical activity performed at home with physical activity performed in the community. Materials and methods. The study was carried out from October, 2016 to February, 2017 of Vilnius city, Karoliniškės and Lazdynai microdistricts, of representatives the premises and Vilnius university faculty of medicine department of Rehabilitation, physical and sports medicine. In the study participated 60 subjects were randomized into groups of 30 persons. The experimental group performed exercise group pursuing conducting of physiotherapist while the control group the same exercises performed at home the themselves. Exercise were carried out twice a week, for eight weeks, each session lasted about 40 minutes. Testing was performed before the intervention and after eight weeks. In the second testing 39 persons had been tested. The short physical performance batery was used to evaluate for fitness, The Functional Reach Test and Modified Keitel index – were used to evaluate for mobility and SF-36 quality of life questionnaire was used to evaluate quality of life in study sample. Data analysis was performed using the computer program SPSS 23.0 for windows statistical package. Results. After eight weeks of intervention, fitness test scores of the community groups increased by an average result of 2.19 points, the change was statistically significant (p 0,05). The study results showed that Quality of life indicators of community group were statistically significant different and the average score increased by 11 points (p0,05). Conclusions: 1. There were statistically significant effectiveness in fitness, mobility and quality of life in assessing of clinical tests after of physical activity course, performed in the community, of older adults (p0,05); 3. There were statistically significant effectiveness in fitness, mobility and quality of life after of physical activity carried out in the community, along with others, and physiotherapist at the experiment care of older adults (p<0,05)
A comparison of optimization models to evaluate the impact of fuel costs when designing new cruise itineraries
No full textThe itinerary design is a problem that belongs to the class of cruise supply. The development of cruises’ itineraries to offer on the market is a long process. Given a ship located in a specific world’s basin, given a duration and a homeport, an itinerary has to be planned choosing a sequence of ports to visit among a set of available ones. The itinerary must be characterized by a schedule, which comprehends the arrival time and the departure time of the ship for each port. The objectives to pursue in the decisions are the maximization of both the customer satisfaction and the revenue and the minimization of the costs. In this paper the focus is on costs, that depend on fuel consumption and ports’ services. The fuel cost is function of the speed of the ship. Starting from a model recently proposed in the literature for solving the cruise itinerary designing problem (CIDP) (Ambrosino et al. in Proceedings of 15th IFAC Symposium on Control in Transportation Systems, Savona, Italy, June 2018, [3]) in which fuel costs were based on classes of speed, a different model has been developed for including a more precise fuel cost computation. The fuel costs represent a great part of the company costs, influencing the operative margin. Thus, the fuel consumption is here computed in terms of metric tons for each single speed. The model has been tested solving real cases of Costa Crociere in the Mediterraneo basin. The obtained solutions have been compared, both in terms of cruise route and objectives values with those obtained by the previous model used by the company to define optimal itineraries
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Yemeni Jewish identity in the works of Simha Zaramati Asta
No full texttextIn this paper, I consider the collection of short stories and photographs Neighborhood Album A by Yemeni Israeli author Simha Zaramati Asta. I argue that Asta contributes to a distinctively Yemeni Jewish literature and identity in Israel. While Asta could be considered a Mizrahi author, I claim that a study of Asta’s text as Mizrahi in fact erases the distinctive Yemeni elements of Asta’s writing. Instead, Asta is purposeful about her inclusion of Yemeni culture and her establishment of Yemeni identity in her text. This Yemeni culture is evident in Asta’s inclusion of the songs of Yemeni Jewish women which constitute an oral tradition of memory within Yemen and Israel. Asta further creates a distinctive Yemeni identity through a sense of place in the Yemeni Quarter of Tel Aviv in both her stories and photographs. Through descriptions of the sights, smells, and traditions of the Yemeni Quarter of Tel Aviv, Asta elevates the neighborhood, claiming it as a place where the divine spirit can be found. While Asta is purposeful in her creation of a distinctively Yemeni Jewish literature and identity, she demonstrates the hybridization of this Yemeni Jewish literature and identity with Israeli literature and identity. By noting the importance of Yemeni Jews to the creation of Israel and the influence of Israel on these Yemeni Jews, Asta claims Israeli identity for Yemeni Jews. She demonstrates the hybridization of the Yemeni Jewish identity and Israeli identity through intertextual references to canonical Israeli poets and authors. Yet while Asta values this hybridization, she uses the characters in her stories to question whether the hybridization of Yemeni Jews in Israel can in fact succeed.Middle Eastern Studie
Urban Landscape Photography Exhibited in 'Check-in Europe - Reflecting Identities in Contemporary Art', EPO, Munich, Germany, (May - July 2006), curated by Marius Babias, Beral Madra, Marketta Seppälä, Veronica Wiman and Erno Vroonen
No full textUrban landscape photography from Billingham's series 'Black Country' was exhibited in 'Check-in Europe - Reflecting Identities in Contemporary Art', EPO, Munich, Germany, (May - July 2006), curated by Marius Babias, Beral Madra, Marketta Seppälä, Veronica Wiman and Erno Vroonen. Other participating artists included Hussein Chalayan, Asta Gröting, Lia Perjovschi, Daniel Knorr, Regina Möller, Frida Fjellman and Róza El-Hassan
Das Asta-Framework- : ein Framework für automatisierte Aktienhandelsstrategien auf Basis von technischer- und News-Analyse
No full textNeue Informationen über Unternehmen und der vergangene Kursverlauf beeinflussen auch die zukünftige Entwicklung der Wertpapiere. Ein automatisiertes System bietet die Möglichkeit, Informationen aus einer Vielzahl von Quellen zu verarbeiten und daraus Vorhersagen für Kursentwicklungen abzuleiten. Diese Arbeit untersuchte automatisierte Aktienhandelssysteme und -Frameworks, die es ermöglichen, technische Analysen basierend auf vergangenen Kursdaten und Analysen basierend auf Unternehmensneuigkeiten zu verwenden, um die Entwicklung von Wertpapieren vorhersehen zu können. Eine Literaturrecherche wurde durchgeführt, um vergleichbare Systeme und Frameworks zu finden und den aktuellen Stand der Literatur und Praxis zu evaluieren. Aus den daraus gewonnenen Erkenntnissen und Einzelteilen wurde das ASTA-Framework, kurz für Automatic Stock Trading Analysis Framework, konstruiert und implementiert, das eine Integration der Einzelteile vornimmt und auch Erweiterungsmöglichkeiten vorsieht. Aus der Literatur wurden Anwendungsfälle abgeleitet und beispielhaft umgesetzt, um die Verwendung des ASTA-Frameworks zu zeigen. Die Literaturrecherche bestätigte, dass es viele theoretische Quellen und viel Stückwerk zur Thematik Neuigkeiten-Analyse und technischer Analyse gibt, die erst kombiniert und integriert werden müssen. Die Architektur des ASTA-Framework sieht viele Schnittstellen und Möglichkeiten vor, um bestehende Teile aus der Literatur und Praxis integrieren zu können. Es gibt Schnittstellen vor, um bestehende Handels- und Backtesting-Systeme für die Ausführung verwenden zu können. Diese Schnittstellen ermöglichen es, die Systeme um die Funktionalitäten zur Beschaffung und Verwendung von Neuigkeiten für das Generieren von Handelssignalen und Handelsstrategien zu erweitern. Diese Masterarbeit spricht private Anleger mit einem mittleren Anlagehorizont von Wochen bis Monate an, die ihr Handeln automatisieren möchten.New information about companies and the stock price history can influence their future stock prices. An automated trading system can handle a variety of data sources and can therefore make a possible prediction of the stock market trends. This master thesis examines automatic stock trading systems and frameworks, which can use technical analysis based on price data history and news analysis to predict trends for stock prices. The author assumes that there are a lot of theoretical sources and practical fragments about this topic, which must be integrated and combined. A literature review was done to evaluate comparable systems and frameworks and the state of the art of literature and practice. The author used the insights to design and implement the so-called ASTA-framework, which is the short form of automatic stock trading analysis framework. It integrates and combines these fragments and enables to integrate additional extensions. Use cases were derived from the literature, which were also implemented to show the usage of the ASTA-framework. The framework was evaluated and compared against another framework based on predefined evaluation criterions from the literature. It does not implement functionality to execute orders but integrates a framework for this purpose. It also provides interfaces to add additional frameworks and systems or to replace the original one to execute and test stock orders. The framework supports the integration of news as an additional input that is used to generate trade signals. For the ASTA-framework the graphical interface simplifies the strategy parameterization and the usage of implemented strategies. This master thesis addresses private investors with a midtime range of weeks to month and the desire to automate the stock trading or people who want to check, optimize, or trade their stock strategy ideas.eingereicht von Thomas WeberndorferMasterarbeit Universität Linz 201
Das Asta-Framework- : ein Framework für automatisierte Aktienhandelsstrategien auf Basis von technischer- und News-Analyse
No full textNeue Informationen über Unternehmen und der vergangene Kursverlauf beeinflussen auch die zukünftige Entwicklung der Wertpapiere. Ein automatisiertes System bietet die Möglichkeit, Informationen aus einer Vielzahl von Quellen zu verarbeiten und daraus Vorhersagen für Kursentwicklungen abzuleiten. Diese Arbeit untersuchte automatisierte Aktienhandelssysteme und -Frameworks, die es ermöglichen, technische Analysen basierend auf vergangenen Kursdaten und Analysen basierend auf Unternehmensneuigkeiten zu verwenden, um die Entwicklung von Wertpapieren vorhersehen zu können. Eine Literaturrecherche wurde durchgeführt, um vergleichbare Systeme und Frameworks zu finden und den aktuellen Stand der Literatur und Praxis zu evaluieren. Aus den daraus gewonnenen Erkenntnissen und Einzelteilen wurde das ASTA-Framework, kurz für Automatic Stock Trading Analysis Framework, konstruiert und implementiert, das eine Integration der Einzelteile vornimmt und auch Erweiterungsmöglichkeiten vorsieht. Aus der Literatur wurden Anwendungsfälle abgeleitet und beispielhaft umgesetzt, um die Verwendung des ASTA-Frameworks zu zeigen. Die Literaturrecherche bestätigte, dass es viele theoretische Quellen und viel Stückwerk zur Thematik Neuigkeiten-Analyse und technischer Analyse gibt, die erst kombiniert und integriert werden müssen. Die Architektur des ASTA-Framework sieht viele Schnittstellen und Möglichkeiten vor, um bestehende Teile aus der Literatur und Praxis integrieren zu können. Es gibt Schnittstellen vor, um bestehende Handels- und Backtesting-Systeme für die Ausführung verwenden zu können. Diese Schnittstellen ermöglichen es, die Systeme um die Funktionalitäten zur Beschaffung und Verwendung von Neuigkeiten für das Generieren von Handelssignalen und Handelsstrategien zu erweitern. Diese Masterarbeit spricht private Anleger mit einem mittleren Anlagehorizont von Wochen bis Monate an, die ihr Handeln automatisieren möchten.New information about companies and the stock price history can influence their future stock prices. An automated trading system can handle a variety of data sources and can therefore make a possible prediction of the stock market trends. This master thesis examines automatic stock trading systems and frameworks, which can use technical analysis based on price data history and news analysis to predict trends for stock prices. The author assumes that there are a lot of theoretical sources and practical fragments about this topic, which must be integrated and combined. A literature review was done to evaluate comparable systems and frameworks and the state of the art of literature and practice. The author used the insights to design and implement the so-called ASTA-framework, which is the short form of automatic stock trading analysis framework. It integrates and combines these fragments and enables to integrate additional extensions. Use cases were derived from the literature, which were also implemented to show the usage of the ASTA-framework. The framework was evaluated and compared against another framework based on predefined evaluation criterions from the literature. It does not implement functionality to execute orders but integrates a framework for this purpose. It also provides interfaces to add additional frameworks and systems or to replace the original one to execute and test stock orders. The framework supports the integration of news as an additional input that is used to generate trade signals. For the ASTA-framework the graphical interface simplifies the strategy parameterization and the usage of implemented strategies. This master thesis addresses private investors with a midtime range of weeks to month and the desire to automate the stock trading or people who want to check, optimize, or trade their stock strategy ideas.eingereicht von Thomas WeberndorferMasterarbeit Universität Linz 201
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