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Useful Function (useful + function)
Selected AbstractsShort-term load forecasting using informative vector machineELECTRICAL ENGINEERING IN JAPAN, Issue 2 2009Eitaro Kurata Abstract In this paper, a novel method is proposed for short-term load forecasting, which is one of the important tasks in power system operation and planning. The load behavior is so complicated that it is hard to predict the load. The deregulated power market is faced with the new problem of an increase in the degree of uncertainty. Thus, power system operators are concerned with the significant level of load forecasting. Namely, probabilistic load forecasting is required to smooth power system operation and planning. In this paper, an IVM (Informative Vector Machine) based method is proposed for short-term load forecasting. IVM is one of the kernel machine techniques that are derived from an SVM (Support Vector Machine). The Gaussian process (GP) satisfies the requirements that the prediction results are expressed as a distribution rather than as points. However, it is inclined to be overtrained for noise due to the basis function with N2 elements for N data. To overcome this problem, this paper makes use of IVM that selects necessary data for the model approximation with a posteriori distribution of entropy. That has a useful function to suppress the excess training. The proposed method is tested using real data for short-term load forecasting. © 2008 Wiley Periodicals, Inc. Electr Eng Jpn, 166(2): 23, 31, 2009; Published online in Wiley InterScience (www. interscience.wiley.com). DOI 10.1002/eej.20693 [source] Multidisciplinary assessment at triage: A new way forwardEMERGENCY MEDICINE AUSTRALASIA, Issue 1 2004Joanna R Richardson Abstract Objective:, To evaluate a dual doctor and nurse triage system at a tertiary referral hospital. Methods:, Data were compared between periods of multidisciplinary triage and periods of standard triage. Data comparison was also made between rostered multidisciplinary triage shifts and non-multidisciplinary triage shifts. Staff satisfaction with the process was assessed. Results:, The percentage of patients seen within Australasian Triage Scale performance indicator thresholds increased from 75% to 81% in Category 2 patients (P = 0.12) and 56% to 78% in Category 3 patients (P < 0.0001). There was a reduction of 50% in the number of patients who left prior to being seen by a doctor (P = 0.024). Surveys showed high staff satisfaction with the process. Conclusions:, We feel that multidisciplinary triage performs a useful function in our department enabling us to reduce waiting times. The process is widely accepted amongst the staff and it ensures a senior doctor assesses most patients. It reduces the number of patients leaving prior to being seen by a doctor and it provides one way of getting around access block and a physically small department. [source] Circuit Breakers with Uncertainty about the Presence of Informed Agents: I Know What You Know , I ThinkFINANCIAL MARKETS, INSTITUTIONS & INSTRUMENTS, Issue 3 2005by Lucy F. Ackert This study conducts experimental asset markets to examine the effects of circuit breaker rules on market behavior when agents are uncertain about the presence of private information. Our results unequivocally indicate that circuit breakers fail to temper unwarranted price movements in periods without private information. Agents appear to mistakenly infer that others possess private information, causing price to move away from fundamental value. Allocative efficiencies in our markets are high across all regimes. Circuit breakers perform no useful function in our experimental asset markets. [source] Freshwater crayfish farming technology in the 1990s: a European and global perspectiveFISH AND FISHERIES, Issue 4 2000H.E.G. Ackefors This paper aims to describe the state of crayfish farming technology in the USA, Australia and Europe, and to discuss some of the prerequisites for this industry. Data from Europe are partly based on replies from a questionnaire sent out to scientists in all European countries. For other parts of the world, the crayfish literature has been reviewed and data from the August 2000 meeting of the International Association of Astacology are also included. Issues addressed in this review are cultivated species, production and productivity figures, production technique with regard to enclosures, reproduction and feed items, disease problems, predators, pond vegetation and water quality. Fewer than a dozen crayfish species are cultivated. The most attractive ones for culture and stocking in natural waters have been transferred to more than one continent. Pond rearing techniques predominate in all countries, and the technology required to achieve the spawning and rearing of juveniles is relatively simple. Pieces of fish, carrots and potatoes are frequent supplementary feed items; plants, cereals, pieces of meat, zooplankton and pellets are also common. Diseases are not usually a major concern, except in Europe where the American plague fungus, Aphanomyces astaci, has eradicated many European crayfish populations. Predators identified as common include insects and amphibians, as well as fishes, birds and mammals. Many water macrophytes are common in crayfish farms. These may either serve a useful function or cause problems for the crayfish farmer. Water temperature is the crucial factor for crayfish production. Water parameters such as pH and certain inorganic ion concentrations may also be of concern. Acidic waters that occur in some areas are generally detrimental to crayfish. The total yield from crayfish production from farming and fishery is in the order of 120 000,150 000 tonnes, more than four times the quantity given by FAO statistics. The largest crayfish producer is the Peoples' Republic of China, followed by the USA (70 000 and 50 000 tonnes in 1999, respectively). Of the quantity produced in the USA in 1999, about 35 000 tonnes was farmed. The yield in Europe was about 4500 tonnes in 1994, and of this quantity only 160 tonnes came from aquaculture. There are no official statistics for crayfish fishery production in Australia, but about 400 tonnes came from aquaculture in 1999. [source] Teachers' Pets and Why They Have Them: An Investigation of the Human Animal Bond,JOURNAL OF APPLIED SOCIAL PSYCHOLOGY, Issue 8 2006Sara Staats The present study queried a random, university faculty sample as to their reasons for owning pets. Mere pet ownership was not correlated with self-reported health, happiness, or quality of work life in this sample. Five dominant reasons were given for pet ownership. Women were more likely than men to self-report reasons related to social support for pet ownership, including that a pet helped them get through hard times and that they would be lonely without a pet. Men were more likely to report pragmatic reasons, such as the pet facilitating exercise or serving a useful function. Beliefs in the positive effects of pets on health were typical. Those beliefs in the health promoting aspects of pets are suggested as a link to human health and a promising area for future research. [source] Acting up or acting out?LITERACY, Issue 1 2010Unlocking children's talk in literature circles Abstract It is generally accepted that talk enriches children's interpretations of texts in literature circle discussions. However, the nature of that talk and exactly how it facilitates interpretation of texts has not been much analysed. This article describes some work undertaken with a class of Scottish children, aged 9,10, to introduce them to the idea of literature circles. The literature circle discussions were then recorded and analysed. The purpose of the project was to record the kinds of exchanges, chains of comment and range of discourses and voices that children used when talking among themselves, and to reflect on their function and value. It was found that a lot of the talk was exploratory though not always in the sense proposed by Mercer. In his terms much was ,cumulative'. Some talk veered towards anecdotal chat. The children also frequently put on voices not their own, mimicking characters in the story they were reading, and other people they knew. These forms of talk are not always encouraged in the classroom, their effectiveness for learning being in doubt. This article argues that cumulative talk, the telling of anecdotes and the performing of different characters' voices all have a useful function in discussions of books: they can encourage engagement, be helpful in bringing texts to life and advance children's thinking about literature. [source] The new CCP4 Coordinate Library as a toolkit for the design of coordinate-related applications in protein crystallographyACTA CRYSTALLOGRAPHICA SECTION D, Issue 12-1 2004E. B. Krissinel The new CCP4 Coordinate Library is a development aiming to provide a common layer of coordinate-related functionality to the existing applications in the CCP4 suite, as well as a variety of tools that can simplify the design of new applications where they relate to atomic coordinates. The Library comprises a wide spectrum of useful functions, ranging from parsing coordinate formats and elementary editing operations on the coordinate hierarchy of biomolecules, to high-level functionality such as calculation of secondary structure, interatomic bonds, atomic contacts, symmetry transformations, structure superposition and many others. Most of the functions are available in a C++ object interface; however, a Fortran interface is provided for compatibility with older CCP4 applications. The paper describes the general principles of the Library design and the most important functionality. The Library, together with documentation, is available under the LGPL license from the CCP4 suite version 5.0 and higher. [source] Cobalt Coordination and Clustering in ,-Co(OH)2 Revealed by Synchrotron X-ray Total ScatteringCHEMISTRY - A EUROPEAN JOURNAL, Issue 33 2010James Abstract Structures of layered metal hydroxides are not well described by traditional crystallography. Total scattering from a synthesis-controlled subset of these materials, as described here, reveals that different cobalt coordination polyhedra cluster within each layer on short length scales, offering new insights and approaches for understanding the properties of these and related layered materials. Structures related to that of brucite [Mg(OH)2] are ubiquitous in the mineral world and offer a variety of useful functions ranging from catalysis and ion-exchange to sequestration and energy transduction, including applications in batteries. However, it has been difficult to resolve the atomic structure of these layered compounds because interlayer disorder disrupts the long-range periodicity necessary for diffraction-based structure determination. For this reason, traditional unit-cell-based descriptions have remained inaccurate. Here we apply, for the first time to such layered hydroxides, synchrotron X-ray total scattering methods,analyzing both the Bragg and diffuse components,to resolve the intralayer structure of three different ,-cobalt hydroxides, revealing the nature and distribution of metal site coordination. The different compounds with incorporated chloride ions have been prepared with kinetic control of hydrolysis to yield different ratios of octahedrally and tetrahedrally coordinated cobalt ions within the layers, as confirmed by total scattering. Real-space analyses indicate local clustering of polyhedra within the layers, manifested in the weighted average of different ordered phases with fixed fractions of tetrahedrally coordinated cobalt sites. These results, hidden from an averaged unit-cell description, reveal new structural characteristics that are essential to understanding the origin of fundamental material properties such as color, anion exchange capacity, and magnetic behavior. Our results also provide further insights into the detailed mechanisms of aqueous hydrolysis chemistry of hydrated metal salts. We emphasize the power of the methods used here for establishing structure,property correlations in functional materials with related layered structures. [source] | ||||||||||