Weeds cause harm to crops by competing for water, light, nutrients and space, reducing crop yields and inhibiting the efficiency of machinery. Although there is a large volume of work on this topic, previous studies h...
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ISBN:
(纸本)9781450305716
Weeds cause harm to crops by competing for water, light, nutrients and space, reducing crop yields and inhibiting the efficiency of machinery. Although there is a large volume of work on this topic, previous studies have lacked accuracy and efficiency. In this paper an algorithm has been developed and analyzed for real-time specific weeds discrimination that is employed Haar Wavelet Transform (HWT). there are three stages of this paper, segmentation stage, feature extraction stage, and classification stage. Based on the proposed algorithm, 200 highest and informative coefficients are extracted at feature extraction stage, then at the classification stage, a well known classifier k-NN (k-Nearest Neighbor, for which k = 2) has been applied. the proposed method was tested on the database of 200 samples of each category. Furthermore, the result of our proposed method improves the performance by 7-10% as compared with some of the existing techniques that used histogram maxima withthreshold, and angular cross sectional intensities. In conclusion, the proposed technique is more accurate at weed leaf classification than the existing techniques when images are captured by a CCD camera. the overall accuracy and efficiency utilizing the proposed method using haar wavelet transform is 94% and 40 ms respectively. Copyright 2011 acm.
In demanding academic environments students expect 100% uptime. It is rarely the case when dealing with school technology including Macs, PCs, printers, servers, complex networks and numerous peripherals that everythi...
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the proceedings contain 40 papers. the topics discussed include: code complexity impact of widgets accessibility implementation in JavaScript open-source libraries;a systematic process for computing Bourdieusian socia...
ISBN:
(纸本)9781450386098
the proceedings contain 40 papers. the topics discussed include: code complexity impact of widgets accessibility implementation in JavaScript open-source libraries;a systematic process for computing Bourdieusian social capital within institutional profiles on twitter;a mobile tool for collecting and labeling data on twitter’s network sociability practices;a proposal for an accessible videoconferencing interface for people with hearing impairments;PhysioAR: an augmented reality system applied in respiratory physiotherapy for hypertensive patients;systematic mapping of the literature on mobile apps for people with autistic spectrum disorder;an approach for automatic description of characters for blind people;upper limb motion tracking and classification: a smartphone approach;and a haptic system for switching wind temperatures based on ultrasonic vibrations, peltier elements, and electrical resistances for multisensory applications.
State-of-the-art multiprocessor cache hierarchies propagate the use of a fixed granularity in the cache organization to the design of the coherence protocol. Unfortunately, the fixed granularity, generally chosen to m...
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ISBN:
(纸本)9781450320795
State-of-the-art multiprocessor cache hierarchies propagate the use of a fixed granularity in the cache organization to the design of the coherence protocol. Unfortunately, the fixed granularity, generally chosen to match average spatial locality across a range of applications, not only results in wasted bandwidth to serve an individual thread's access needs, but also results in unnecessary coherence traffic for shared data. the additional bandwidth has a direct impact on boththe scalability of parallel applications and overall energy consumption. In this paper, we present the design of Protozoa, a family of coherence protocols that eliminate unnecessary coherence traffic and match data movement to an application's spatial locality. Protozoa continues to maintain metadata at a conventional fixed cache line granularity while 1) supporting variable read and write caching granularity so that data transfer matches application spatial granularity, 2) invalidating at the granularity of the write miss request so that readers to disjoint data can co-exist with writers, and 3) potentially supporting multiple non-overlapping writers within the cache line, thereby avoiding the traditional ping-pong effect of both read-write and write-write false sharing. Our evaluation demonstrates that Protozoa consistently reduce miss rate and improve the fraction of transmitted data that is actually utilized. Copyright 2013 acm.
computing workloads often contain a mix of interactive, latency-sensitive foreground applications and recurring background computations. To guarantee responsiveness, interactive and batch applications are often run on...
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ISBN:
(纸本)9781450320795
computing workloads often contain a mix of interactive, latency-sensitive foreground applications and recurring background computations. To guarantee responsiveness, interactive and batch applications are often run on disjoint sets of resources, but this incurs additional energy, power, and capital costs. In this paper, we evaluate the potential of hardware cache partitioning mechanisms and policies to improve efficiency by allowing background applications to run simultaneously with interactive foreground applications, while avoiding degradation in interactive responsiveness. We evaluate these tradeoffs using commercial x86 multicore hardware that supports cache partitioning, and find that real hardware measurements with full applications provide different observations than past simulation-based evaluations. Co-scheduling applications without LLC partitioning leads to a 10% energy improvement and average throughput improvement of 54% compared to running tasks separately, but can result in foreground performance degradation of up to 34% with an average of 6%. With optimal static LLC partitioning, the average energy improvement increases to 12% and the average throughput improvement to 60%, while the worst case slowdown is reduced noticeably to 7% with an average slowdown of only 2%. We also evaluate a practical low-overhead dynamic algorithm to control partition sizes, and are able to realize the potential performance guarantees of the optimal static approach, while increasing background throughput by an additional 19%. Copyright 2013 acm.
As a user of products and technology, one often experiences a wide range of emotions: happiness, frustration, gratitude, irritation, excitement, and apathy amongst others. Yet, as designers and deliverers of these too...
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ISBN:
(纸本)9781450314947
As a user of products and technology, one often experiences a wide range of emotions: happiness, frustration, gratitude, irritation, excitement, and apathy amongst others. Yet, as designers and deliverers of these tools and services, the human factor is often neglected with dire consequences. Deadlines and budgets become more important than analyzing the needs and behaviors of the user, unlinking the resource from its consumer. this degrades the perception of the offering and can be irreversible (and potentially fatal) to the reputation of software companies, IT departments, and hardware manufacturers. Despite the failings of many companies that have neglected the human element - companies that lacked empathy for their users - products continue to be delivered that are unintuitive, over designed, or inefficient. A great product or offering considers the user's experience (UX) when interacting withthe service. the product is efficient and intuitive, while being transparent in presentation. UX is generally associated with software, but experiences are designed outside of computing as well. An often-polarizing example is customer service;customers remember great customer service experiences as much as they remember poor experiences. Technology often enhances the user experience, but the experience itself is not confined to interactions with specific tools. Training IT help desk staff on how to interact with customers may not be something traditionally thought of as a UX initiative, but this is one small part of the experience that is designed for individuals having issues withtheir devices. At Santa Clara Law, the Law Technology and Academic computing (LTAC) group has improved efficiency, customer satisfaction, and saved time by considering UX principles early and often. Decisions once made with dangerous assumptions on the user's behalf are now considered with comprehensive data collected from a variety of different sources. Listening to what users are saying also h
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