58 research outputs found
SimMobility Short-Term: An Integrated Microscopic Mobility Simulator
This paper presents the development of an integrated microscopic mobility simulator, SimMobility Short-Term (ST). The simulator is integrated because its models, inputs and outputs, simulated components, and code base are integrated within a multiscale agent- and activity-based simu- lation platform capable of simulating different spatiotemporal resolutions and accounting for different levels of travelers’ decision making. The simulator is microscopic because both the demand (agents and its trips) and the supply (trip realization and movements on the network) are microscopic (i.e., modeled individually). Finally, the simulator has mobility because it copes with the multimodal nature of urban networks and the need for the flexible simulation of innovative transportation ser - vices, such as on-demand and smart mobility solutions. This paper follows previous publications that describe SimMobility’s overall framework and models. SimMobility is an open-source, multiscale platform that considers land use, transportation, and mobility-sensitive behavioral models. SimMobility ST aims at simulating the high-resolution movement of agents (traffic, transit, pedestrians, and goods) and the operation of different mobility services and control and information systems. This paper presents the SimMobility ST modeling framework and system architecture and reports on its successful calibration for Singapore and its use in several scenarios of innovative mobility applications. The paper also shows how detailed performance measures from SimMobility ST can be integrated with a daily activity and mobility patterns simulator. Such integration is crucial to model accurately the effect of different technologies and service operations at the urban level, as the identity and preferences of simulated agents are maintained across temporal decision scales, ensuring the consistency and accuracy of simulated accessibility and performance measures of each scenario.Singapore. National Research Foundation (CREATE program)Singapore-MIT Alliance. Center. Future Urban Mobility Interdisciplinary Research Grou
TV White Space: the first step towards better utilization of frequency spectrum
This book covers the full spectrum of TVWS technology including regulations, technology, standardizations, and worldwide deployments. It begins with an introduction to cognitive radio and TVWS. The regulation activities in TVWS throughout North America, Europe, and Asia Pacific are covered in depth. After a discussion of regulations, the authors examine the standardizations developed to specify the enabling technologies of TVWS systems. The following chapter focuses on the key technologies that differentiate TVWS from a conventional wireless communication system
A Review of Studies Reporting on Complications of Upper Urinary Tract Stone Ablation Using the Holmium:YAG Laser
Influence of Compression Ratio Differences between Magnetic Resonance Images and Simple Radiographs on Osteoporotic Vertebral Compression Fracture Prognosis after Vertebroplasty
Port security strategy 2012
Includes supplementary materialU.S. Navy and commercial ships have been lucrative targets for terrorist organizations. Realizing that ships are most vulnerable while in-port, adequate measures must be employed by port facilities to ensure vessel security. Commercial and naval ports have been set as a national priority in Homeland Security Presidential Directive 13. A successful terrorist strike against a port could produce long-term economic impact. In an attempt to develop a system of systems to prevent and defeat terrorist attacks against foreign and domestic ports, this study approached the threat from three different aspects: terrestrial, seaborne, and internal. This report uses the Systems Engineering Design Process to define the problem, generate alternatives, model scenarios, and analyze results to produce feasible and cost-effective solutions. No single system can address all issues prevalent in the port security problem. The recommended solutions individually address specific threats, namely vehicle-borne improvised explosive devices, small boat swarm tactics, importation of contraband or weapons of mass destruction, and employee sabotage. Although each solution effectively increased port security, improved port security measures resulted in greater cost. Some solutions yielded only marginal gain in effectiveness with drastic increases in cost.N
Bcl-2 and BLIMP-1 expression predict worse prognosis in gastric diffuse large B cell lymphoma (DLCBL) while other markers for nodal DLBCL are not useful
Variation in FDG uptake on PET in patients with radiation-induced pelvic insufficiency fractures: a review of 10 cases
- …