37,552 research outputs found
Multiple Dispatch in Practice
Multiple dispatch uses the run time types of more than one argument to a method call to determine which method body to run. While several languages over the last 20 years have provided multiple dispatch, most object-oriented languages
still support only single dispatch - forcing programmers to implement multiple dispatch manually when required. This thesis presents an empirical study of the use of multiple dispatch in practice, considering six languages that support
multiple dispatch. We hope that this study will help programmers understand the uses and abuses of multiple dispatch; virtual machine implementors optimise multiple dispatch; and language designers to evaluate the choice of providing multiple dispatch in new programming languages
Risk Limiting Dispatch with Ramping Constraints
Reliable operation in power systems is becoming more difficult as the
penetration of random renewable resources increases. In particular, operators
face the risk of not scheduling enough traditional generators in the times when
renewable energies becomes lower than expected. In this paper we study the
optimal trade-off between system and risk, and the cost of scheduling reserve
generators. We explicitly model the ramping constraints on the generators. We
model the problem as a multi-period stochastic control problem, and we show the
structure of the optimal dispatch. We then show how to efficiently compute the
dispatch using two methods: i) solving a surrogate chance constrained program,
ii) a MPC-type look ahead controller. Using real world data, we show the chance
constrained dispatch outperforms the MPC controller and is also robust to
changes in the probability distribution of the renewables.Comment: Shorter version submitted to smartgrid comm 201
An Online Decision-Theoretic Pipeline for Responder Dispatch
The problem of dispatching emergency responders to service traffic accidents,
fire, distress calls and crimes plagues urban areas across the globe. While
such problems have been extensively looked at, most approaches are offline.
Such methodologies fail to capture the dynamically changing environments under
which critical emergency response occurs, and therefore, fail to be implemented
in practice. Any holistic approach towards creating a pipeline for effective
emergency response must also look at other challenges that it subsumes -
predicting when and where incidents happen and understanding the changing
environmental dynamics. We describe a system that collectively deals with all
these problems in an online manner, meaning that the models get updated with
streaming data sources. We highlight why such an approach is crucial to the
effectiveness of emergency response, and present an algorithmic framework that
can compute promising actions for a given decision-theoretic model for
responder dispatch. We argue that carefully crafted heuristic measures can
balance the trade-off between computational time and the quality of solutions
achieved and highlight why such an approach is more scalable and tractable than
traditional approaches. We also present an online mechanism for incident
prediction, as well as an approach based on recurrent neural networks for
learning and predicting environmental features that affect responder dispatch.
We compare our methodology with prior state-of-the-art and existing dispatch
strategies in the field, which show that our approach results in a reduction in
response time with a drastic reduction in computational time.Comment: Appeared in ICCPS 201
China Employment Law Update - August 2014
China_Employment_Law_Update_August_2014.pdf: 79 downloads, before Oct. 1, 2020
Aspects of accountability and assessment in the Netherlands
This article describes aspects of test-based accountability in the Netherlands. It provides a description of the design of the Educational system in the Netherlands, it gives a short introduction to the role of the Dutch Inspectorate of Education in the accountability of schools and describes different assessments that are used as sources of information in the accountability system. For each assessment, the primary function in education and its role in the accountability system are discussed. Finally, the factors that can potentially influence the validity of the accountability indicators and the strong and weak points of the current system are identified and some directions are presented of potential developments of this system
- …