Ohad Greenshpan

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We introduce a formal model for capturing the notion of mashup in its globality. The basic component in our model is the mashlet. A mashlet may query data sources, import other mashlets, use external Web services, and specify complex interaction patterns between its components. A mashlet state is modeled by a set of relations and its logic specified by(More)
Crowd-based data sourcing is a new and powerful data procurement paradigm that engages Web users to collectively contribute information. In this work, we target the problem of gathering data from the crowd in an economical and principled fashion. We present Ask It!, a system that allows interactive data sourcing applications to effectively determine which(More)
A mashup is a Web application that integrates data, computation and UI elements provided by several components into a single tool. The concept originated from the understanding that there is an increasing number of applications available on the Web and a growing need to combine them in order to meet user requirements. This paper presents MatchUp, a system(More)
Simulation-Based Models of Emergency Departments: Operational, Tactical and Strategic Staffing: Online Supplement S. Zeltyn, B. Carmeli, O. Greenshpan, Y. Mesika, S. Wasserkrug, P. Vortman IBM Haifa Research Lab, Israel AND Y. Marmor, A. Mandelbaum, A. Shtub, T. Lauterman Technion – Israel Institute of Technology, Haifa, Israel AND D. Schwartz, K.(More)
Despite the tremendous popularity of social network sites both on the web and within enterprises, the relationship information they contain may be often incomplete or outdated. We suggest a novel crowdsourcing approach that uses a game to help enrich and expand the social network topology. The game prompts players to provide the names of people who have a(More)
A mashup is a Web application that integrates data, computation and GUI provided by several systems into a unique tool. The concept originated from the understanding that the number of applications available on the Web and the need for combining them to meet user requirements, are growing very rapidly. This demo presents MatchUp, a system that supports(More)
We introduce in this Demonstration a system called Trivia Masster that generates a very large Database of facts in a variety of topics, and uses it for question answering. The facts are collected from human users (the “crowd”); the system motivates users to contribute to the Database by using a Trivia Game, where users gain points based on(More)
Emergency Departments (EDs) require advanced support systems for monitoring and controlling their processes: clinical, operational, and financial. A prerequisite for such a system is comprehensive operational information (e.g. queueing times, busy resources,...), reliably <i>portraying and predicting</i> ED status as it evolves in time. To this end,(More)
The Emergency Department (ED) of a modern hospital is a highly complex system that gives rise to numerous managerial challenges. It spans the full spectrum of operational, clinical, and financial perspectives, over varying horizons: operational&#8212;a few hours or days ahead; tactical&#8212;weeks or a few months ahead; and strategic, which involves(More)
Web 2.0 provides the technological foundations upon which the crowdsourcing paradigm evolves and operates, enabling networked experts to work on various problem solving and data-intensive tasks. During the past decade crowdsourcing grew from a number of purpose-built initiatives, such as Wikipedia and Mechanical Turk, to a technique that today attracts and(More)