The Img2UML repository is a repository of UML models. A huge amount of UML models is available on the Internet - mostly in the form of images. This repository aims to offer these UML class diagram as a searchable XMI ...
详细信息
Design of multi-element antennas (MA) for small mobile terminals operating at higher frequencies remains challenging despite smaller antenna dimension and possibility of achieving electrically large separation between...
详细信息
Design of multi-element antennas (MA) for small mobile terminals operating at higher frequencies remains challenging despite smaller antenna dimension and possibility of achieving electrically large separation between them. In this paper, the importance of the type of radiating elements operating at 3400-3600MHz and their locations on the terminal chassis is highlighted. An isotropic radiation pattern that receives incoming signals from arbitrary directions is obtained by combining the radiation patterns of multiple antennas with localized chassis current distribution. Four MA configurations with two- and eight-element antennas are designed and evaluated experimentally in indoor propagation environments. Our proposed designs of MAs provide the highest MIMO channel capacity compared to their counterparts using antennas with less localized chassis current distribution, even in the presence of user's hand.
Traditional Byzantine resilient algorithms use 2f + 1 vertex-disjoint paths to ensure message delivery in the presence of up to f Byzantine nodes. The question of how these paths are identified is related to the funda...
详细信息
A learning environment based on Microsoft Excel spreadsheets is presented allowing for fast and systematic exploration of different implementations of integer adder designs. The spreadsheet properties are exploited to...
详细信息
This paper proposes an online tree-based Bayesian approach for reinforcement learning. For inference, we employ a generalised context tree model. This defines a distribution on multivariate Gaussian piecewise-linear m...
详细信息
This paper proposes an online tree-based Bayesian approach for reinforcement learning. For inference, we employ a generalised context tree model. This defines a distribution on multivariate Gaussian piecewise-linear models, which can be updated in closed form. The tree structure itself is constructed using the cover tree method, which remains efficient in high dimensional spaces. We combine the model with Thompson sampling and approximate dynamic programming to obtain effective exploration policies in unknown environments. The flexibility and computational simplicity of the model render it suitable for many reinforcement learning problems in continuous state spaces. We demonstrate this in an experimental comparison with a Gaussian process model, a linear model and simple least squares policy iteration.
This paper describes the problem context of software development for mass-produced embedded systems, with distinguishing factors such as the co-design of software and hardware, strong focus on manufacturing aspects, s...
详细信息
Despite the continuous research to facilitate WSNs development, most safety analysis and mitigation efforts in concurrency are still left to developers, who must manage synchronization and shared memory explicitly. In...
详细信息
ISBN:
(纸本)9781450320276
Despite the continuous research to facilitate WSNs development, most safety analysis and mitigation efforts in concurrency are still left to developers, who must manage synchronization and shared memory explicitly. In this paper, we present a system language that ensures safe concurrency by handling threats at compile time, rather than at runtime. Based on the synchronous programming model, our design allows for a simple reasoning about concurrency that enables compile-time analysis resulting in deterministic and memory-safe programs. As a trade-off, our design imposes limitations on the language expressiveness, such as doing computationally-intensive operations and meeting hard realtime responsiveness. To show that the achieved expressiveness and responsiveness is suficient for a wide range of WSN applications, we implement widespread network protocols and the CC2420 radio driver. The implementations show a reduction in source code size, with a penalty of memory increase below 10% in comparison to nesC. Ov rall, we ensure safety properties for programs relying on high-level control abstractions that also lead to concise and readable code.
This course provides an overview of efficient, real-time shadow algorithms. It presents the theoretical background but also discusses implementation details for facilitating efficient realizations (hard and soft shado...
ISBN:
(纸本)9781450323390
This course provides an overview of efficient, real-time shadow algorithms. It presents the theoretical background but also discusses implementation details for facilitating efficient realizations (hard and soft shadows, volumetric shadows, reconstruction techniques). These elements are of relevance to both experts and practitioners. The course also reviews budget considerations and analyzes performance trade-offs, using examples from various AAA game titles and film previsualization tools. While physical accuracy can sometimes be replaced by plausible shadows, especially for games, film production requires more pecision, such as scalable solutions that can deal with highly detailed *** course builds upon earlier SIGGRAPH courses as well as the recent book Real-Time Shadows (A K Peters, 2011) by four of the instructors (due to its success, a second edition is planned for 2014). And with two instructors who have worked on AAA game and movie titles, the course presents interesting behindthe-scenes information that illuminates key topics.
Lecturers see students struggle learning software design. In order to create educational interventions it is needed to know which reasoning skills are related to students' software design performance. We introduce...
详细信息
Lecturers see students struggle learning software design. In order to create educational interventions it is needed to know which reasoning skills are related to students' software design performance. We introduce an online test for measuring students' software design skills and relate those with abstract reasoning. Two student groups of two different European universities participated in an experiment in which we were able to relate students' visual and verbal reasoning skills to students' software design skills and measured learning improvement. In the future proper interventions can be chosen while using the test as a diagnostic tool.
Binary Signed-Digit Residue Number System (BSD-RNS) has been proposed in the literatures as an appropriate number system to perform the arithmetic operations in parallel. BSD-RNS addition is the basic operation and im...
详细信息
暂无评论