Nowadays, the aviation technology has become much reliable than ever, and air transportation is by far the best choice for long distance transportation. Airports serve as the flight nodes for air transportation, and the construction and development of airports are often considered as the most important development plans of the entire country or the local government. The huge amount of cost for constructing an airport and the long (usually more than fifty years) life cycle demand a comprehensive plan in the initial stage of an airport construction. Underestimating the transportation demand of the airport may make it difficult to extend the airport in the future and affect its subsequent operations. On the other hand, overestimating the transportation demand of the airport may result in over-investment and poor operation performance. Around the world, airports are often considered as enterprises. The governments and airport administrators have begun to pay attention to the operation performance of airports and adopt every indicator of the conduct in order to carry on the performance assessment. By doing so, they hope to reduce the operating cost, increase profit, and enlarge their competition advantages. Of the indicators of the operation performance, yearly enplanement has widely been considered as a key indicator. This research collected the data pertaining to commercial airports in the mainland of the United States whose yearly enplanements are over 2,500 passengers. It employs statistical method and decision tree to analyse the relationship between the population change of the metropolitan (population, density of population, population change, etc.) and the yearly enplanement change of airports. Also, we discuss the relationship among the number of airports in a metropolitan, the distance from an airport to the closest business center, the distance from the airport to another nearest airport, and the yearly enplanement change of the airport.

Advances in electro-mechanical actuation have encouraged revolutions in automobile design which promise to increase fuel efficiency, reduce costs, improve safety and performance, and allow a wider range of architectural choices for the vehicle designer and manufacturer. This is facilitated by the concept of an intelligent corner (IC). The IC consists of traction, steering, camber, and suspension actuators working together to control the forces generated at the wheel/surface interface, allowing complete control of vehicle motion with completely active, as opposed to passive, systems. The most critical actuator to the longitudinal performance of an IC vehicle is the traction system, envisioned in this case as a hub mounted electro-mechanical actuator connected directly to the wheel. This traction actuator consists of a number of primary and supplementary components, including a prime mover, gear train, clutch, brake, bearings, seals, shafts, housing, etc. The consideration of these components in the design of an in-hub electric drive actuator is the subject of this report. Currently, gear trains are used in automobiles to match the operating speed of an internal combustion engine (ICE) to the speed of the vehicle on the road. The same need is anticipated for the hub drive wheel, although with fewer reduction ratio choices due to the responsiveness of the electric motor. Specifying a gear train design includes selecting a gear train architecture, and designing the gears to handle the expected loads. A review of gear design and gear train architectures is presented. A number of electric machines are used in industrial, and now more commonly, vehicle applications; of these, the switched reluctance motor (SRM) represents an excellent candidate for a vehicle prime mover due to its ruggedness, broad torque speed curve, low cost, and simplicity. Integrating the motor and gear train into an electro-mechanical actuator with multiple speeds requires consideration of other ancillary components. Brief design guides are presented for clutches, brakes, bearings, seals, and the structure for the in-hub wheel drive. Given the analytical descriptions of the drive wheel components, methods for managing the numerous design parameters are developed and expanded. Actuator specifications are chosen based upon meeting various vehicle performance requirements such as maximum speed, gradeability, acceleration, and drawbar pull. A proposed parametric drive wheel design is presented to meet the requirements of a generic heavy vehicle. The design demonstrates the feasibility of actuator technology that can be used to increase the performance, maintainability, and refreshability of hybrid electric vehicles while allowing open architecture paradigms to lower costs and spur new levels of manufacturing and innovation. / text

Ericsson AB har en produktionsenhet i Gävle (Sverige), CDC Gävle. Denna enhet är indelad i två fabriker, Skolgången och Avaström. På Skolgången monteras WCDMA radiobasstationer (3G) och på Avaström GSM radiobasstationer (2G). CDC Gävle har idag ett stort returflöde av emballage från inkommande monteringsmaterial. Det förekommer också många störningar i materialförsörjningen till monteringen. CDC Gävle har beslutat att på sikt ska allt material som idag finns på lager befinna sig på hubbar. Syftet med examensarbetet var att undersöka påfyllnaden av monteringsmaterial till linan. Påfyllnad skulle ske direkt mot linan. Resultatet av arbetet blev en teoretisk försörjningsmodell som byggde på att materialet kom från hubbar. Försörjningsmodellen skulle ta hänsyn till nuvarande systemlandskap samt att det skulle ske på ett så kostnads- och utrymmeseffektivt sätt som möjligt. Den skulle också se över problemen med emballage och störningarna i materialflödet. Arbetet skulle besvara följande centrala frågor: • Hur bör materialet fördelas på hubbarna? • Vilka lastbärare är lämpliga vid levereras till linan? • Vilka förändringar kan komma att krävas av befintliga system, arbetsmetodik samt vilka krav ska ställas? • Var och hur bör omplock av material ske? • Hur kommer materialflödet att se ut från hubb till monteringslina? Arbetet har bedrivits genom datainsamling på CDC Gävles olika anläggningar. Det genomfördes även ett flertalet studiebesök för att se hur andra producerande företag arbetade med liknande frågor. Under arbetsgången har det skett kontinuerliga litteraturstudier. Författarna belyste och tog fram ett flertal parametrar som anses avgörande vid utformningen av en ny försörjningsmodell. CDC Gävle måste besluta hur dessa parametrar ska lösas innan en fullständig implementering av hubbar kan börja. Arbetet resulterade i en försörjningsmodell som är generell för både WCDMA och GSM. Arbetet tar också upp hur hubben bör arbeta, vilka funktioner den ska innehålla samt vart den bör lokaliseras. Vidare rekommenderas lämpliga lastbärare och vilka arbetssätt som är lämpliga för CDC Gävle. Ett av de största problemen i arbetet var att ta hänsyn till de speciella materialflödena som CDC Gävle har, detta gällde bl a reklamation och enhetspackade artiklar. Den centrala parametern i hela försörjningsmodellen var frystiden. Frystiden är den tidsperiod från att kunden inte kan ändra sin order till ordern startas på monteringen. Om det inte existerar någon frystid kommer inte hubben hinna plocka fram och leverera det material som CDC Gävle behöver. Författarna bedömer att det finns goda möjligheter att flytta befintliga lager till hubbar. Det bör dock genomföras ett flertal piloter med olika sorters material innan man går vidare. / Ericsson AB has a production unit in Gävle (Sweden), CDC Gävle. The unit is divided into two facilities, Skolgången and Avaström. WCDMA (3G) Radio Base Stations are assembled at Skolgången and GSM (2G) Radio Base Stations are assembled at Avaström. Today CDC Gävle has a major return flow of packing from received assembly material. There also exist several disruptions in the material supply to the assembly. CDC Gävle has decided that in the long term all material, which today is stored in the warehouse, will be stored in hubs. The purpose of the thesis work was to investigate the replenishment of material to the line. Replenishment was to be made directly to line. The result of the thesis work became a theoretical supply model that was based on the material arriving from hubs. The supply model had to consider the present system environment and also be as cost and area efficient as possible. It was also supposed to look at the problems with packing and disruptions within the material flow. The thesis work was to answer the following essential questions: • How should the material be allocated to the hubs? • Which load-carriers are appropriate on delivery to the line? • What changes could be required of the present systems, working methods and also what requirements are to be made? • Where and how should the re-arrangement of material be done? • What will the material flow look like from hub to assembly line? The thesis work has been carried out by the collection of data at CDC Gävle’s different facilities. Several study visits were conducted to see how other producing companies worked with similar questions. During the work process there have been continuous literature studies. The authors elucidated and compiled several parameters, which were considered crucial in the design of a new supply model. CDC Gävle must decide how these parameters will be solved before a full-scale implementation of hubs can begin. The result of the thesis work was a supply model, which is common to both WCDMA and GSM. The thesis work also covers how the hub should work, which functions it will contain and where it should be located. Further, more suitable load-carriers and ways of working for CDC Gävle are recommended. One of the biggest problems was to take into consideration of the special material flows, which CDC Gävle has; amongst those concerned were the claims flow and the unit-packed articles. The essential parameter in the whole supply model was the frozen horizon. The frozen horizon is the time period from when a customer cannot change the order to when the order is started in the assembly. If there is no frozen horizon, the hub will not have enough time to take out and deliver the material, that CDC Gävle need. The authors’ opinion is that there are good possibilities of moving the present warehouse to hubs. However several pilots should be conducted with different kinds of materials before any further step is taken.

In August 2005, Hurricane Katrina devastated the city of New Orleans with widespread flooding and infrastructural damage. The Lower Ninth Ward has since experienced a slow recovery from the catastrophic flooding it endured. Among the various physical, social, and economic challenges still facing the neighbourhood, this thesis identifies the community’s subsequent social disintegration following Katrina, and its continuing challenged access to nutritious food as primary arguments for a food hub co-operative in the center of the neighbourhood. The power of the co-operative lies in the collectivization of social, physical, and financial assets of the currently fractured community. The food “hub” then becomes the heart of the neighborhood, facilitating social ownership, renewed purpose and responsibility, and financial empowerment. At an urban scale the centrally located food hub anchors an expansive food network, enabling a city ward currently devoid of collective means to get back on its feet.

There are more and more incompatible systems with the growing number of services provided by computers. The user has to chose between expensive huge systems, offered by large companies like Microsoft or Oracle and losing competition. While these huge systems have a lot of possibilities, small and middle sized companies can only use a small portion of options offered there. With the increasing pressure from competitors, this forces users to choose other technologies like Web Services, in order to survive rivalry. WSDL (Web Services Description Language) was invented to describe Web Services in the most simple way there is. Web Service is a collection of protocols and standards used for exchanging data between applications or systems. Software applications written in various programming languages and running on various platforms can use web services to exchange data over computer networks like the Internet in a manner similar to inter-process communication on a single computer. In this work the methods are suggested for creation of stand-alone E-Commerce Hub and combining other systems into it. By the help of Web Services, users of Internet Stores, and other systems based on product and service data, are able to share their information with others through the E-Commerce Hub. It is easily automated and requires no maintenance.

The relationship between cars and cities is changing. The auto-centric development predominant in America in the 20th century is beginning to subside and disappear. It is being replaced by efforts to make cities more sustainable, enjoyable, and accessible by their citizens without the need to always own a personal vehicle. Given the issues inherent in building more infrastructure to support the ever-growing demand for automobiles, continuing to rely on fossil fuels to power them, or living in neglected spaces designed for machines, an alternative solution is needed. While entirely giving up the car today is socially, politically, economically, and physically impossible, new ways of dealing with it are becoming viable. These developments are currently in their nascent stages, but they hold immense potential to transform the way urban mobility operates in the near future. This thesis explores architecture's response to this emerging reality and proposes that it is time for the car and the city to foster a productive relationship. In the past, architects and urban planners have designed and re-designed the built environment to accommodate the needs of the automobile. Today, there is a need for an architecture which integrates mobility and the means of powering it with vibrant and social urban space. Through the design of a networked mobility hub for Long Island City in Queens, New York, this thesis will re-imagine the relationship between cars and architecture, creating a new paradigm for dealing with the automobile in the city.

In this study, we consider the hub location problem of PTT, first realized by Cetiner (2003), and propose the evaluation of multiple decision criteria while locating hubs. Since the mathematical model for the problem is too large to be solved, we utilize heuristic methods in the solution procedure. While doing this, we first test two algorithms, NSGA-II and SPEA2, on different hub location problems and use the algorithm with better performance while solving the PTT problem.

Thesis (Ph.D.)--University of Pretoria, 2006. / Cover title. "April 2006." Includes bibliographical references.

Thesis (D. Ed. Min.)--New Orleans Baptist Theological Seminary, 2004. / Includes abstract and vita. Includes bibliographical references (leaves 172-176).

Thesis (D. Ed. Min.)--New Orleans Baptist Theological Seminary, 2004. / Includes abstract and vita. Includes bibliographical references (leaves 172-176).