Heuristic algorithms for on-line packing in three dimensions

1992 ◽  
Vol 13 (4) ◽  
pp. 589-605 ◽  
Author(s):  
Keoin Li ◽  
Kam Hoi Cheng
Keyword(s):  
Heuristic Algorithms ◽  
Three Dimensions ◽  
On Line

Heuristic Algorithms for Waste Load Allocation in a River Basin

1989 ◽  
Vol 21 (8-9) ◽  
pp. 1057-1064 ◽  
Author(s):  
Vijay Joshi ◽  
Prasad Modak
Keyword(s):  
Dynamic Programming ◽  
Heuristic Algorithms ◽  
Water Quality Management ◽  
User Preferences ◽  
Theory And Practice ◽  
Waste Load Allocation ◽  
Practical Applications ◽  
Waste Load ◽  
On Line ◽  
The One

Waste load allocation for rivers has been a topic of growing interest. Dynamic programming based algorithms are particularly attractive in this context and are widely reported in the literature. Codes developed for dynamic programming are however complex, require substantial computer resources and importantly do not allow interactions of the user. Further, there is always resistance to utilizing mathematical programming based algorithms for practical applications. There has been therefore always a gap between theory and practice in systems analysis in water quality management. This paper presents various heuristic algorithms to bridge this gap with supporting comparisons with dynamic programming based algorithms. These heuristics make a good use of the insight gained in the system's behaviour through experience, a process akin to the one adopted by field personnel and therefore can readily be understood by a user familiar with the system. Also they allow user preferences in decision making via on-line interaction. Experience has shown that these heuristics are indeed well founded and compare very favourably with the sophisticated dynamic programming algorithms. Two examples have been included which demonstrate such a success of the heuristic algorithms.

scholarly journals Construction of a knowledge based portal for agribusiness

2012 ◽  
Vol 51 (No. 11) ◽  
pp. 495-502
Author(s):  
J. Havlíček ◽  
L. Dömeová ◽  
I. Tichá
Keyword(s):  
Decision Making ◽  
Case Studies ◽  
Best Practice ◽  
Single Point ◽  
Three Dimensions ◽  
Access To Information ◽  
The Third ◽  
Knowledge Based ◽  
Software Packages ◽  
On Line

Virtual portal (VIPO) is designed to provide users with a single-point access to information, and tools to support their decision-making. VIPO illustrates the best practice presented in terms of case studies coded along three dimensions: field, domain and objectives. The second major source of knowledge is based on software packages made available to users including tutor support. The third part of the portal provides useful links to the existing databases which have the potential to facilitate decision making in agribusiness. All three pillars of the VIPO are complemented by on-line consultancy services.

scholarly journals Hypervolume-Optimal μ-Distributions on Line/Plane-based Pareto Fronts in Three Dimensions

2021 ◽  
pp. 1-1
Author(s):  
Ke Shang ◽  
Hisao Ishibuchi ◽  
Weiyu Chen ◽  
Yang Nan ◽  
Weiduo Liao
Keyword(s):  
Three Dimensions ◽  
On Line ◽  
Pareto Fronts

scholarly journals construção empírica e validação de um instrumento de avaliação global de saúde mental

2019 ◽  
Vol 81 (19) ◽  
Author(s):  
Geilsa Soraia Cavalcanti Valente ◽  
Elaine Antunes Cortez ◽  
Carlos Alberto da Cruz Sequeira
Keyword(s):  
Mental Health ◽  
Factor Analysis ◽  
Three Dimensions ◽  
Global Rating ◽  
Psychometric Characteristics ◽  
Mental Health Nursing ◽  
Health Level ◽  
International Research Group ◽  
On Line ◽  
Health Nursing

Com a realização deste estudo, pretendeu-se elaborar e validar o construto e a confi abilidade de uma escala deavaliação global do nível de saúde mental. A escala foi construída a partir da busca on-line e localização de 63modelos de avaliação em saúde mental e posteriormente aplicada em 266 pessoas dos diversos grupos humanos.O processo envolveu a validação do conteúdo por 25 especialistas, participantes do Grupo Internacional deInvestigação em Enfermagem de Saúde mental, testes piloto, medição da confi abilidade utilizando o coefi cientealfa de Cronbach e análise fatorial. Coefi cientes de Cronbach adequados foram obtidos nas três dimensões e aanálise fatorial confi rmou as dimensões da escala. Conclui-se que pode-se inferir que a escala de avaliação globaldo nível de saúde mental é um instrumento confi ável e válido. Os resultados revelam que os itens apresentam boascaracterísticas psicométricas na amostra, podendo constituir um instrumento útil na avaliação da saúde mental nosdiversos grupos humanos.Palavras-chave: Saúde mental; Psicometría; Avaliação de Programas e Instrumentos de Pesquisa.ABsTRAcTIn this study, it was intended to develop and validate the construct and the reliability of a global rating scaleof mental health level. The scale was constructed from the online search and location of 63 evaluation modelsin mental health and later applied to 266 people of various human groups. The process involved the validationof content by 25 experts, participants of the International Research Group on Mental Health Nursing, pilottesting, reliability of measurement using the Cronbach’s alpha coeffi cient and factor analysis. Adequate Cronbachcoeffi cients were obtained in three dimensions and the factor analysis confi rmed the dimensions of scale. Itconcludes that it can be inferred that the overall assessment of the scale of mental health level is a reliable andvalid instrument. The results show that the items have good psychometric characteristics in the sample and canbe a useful tool in the assessment of mental health in different human groups.Keywords: Mental Health; Psychometrics; Evaluation Program and Research Instruments.

scholarly journals Validación de la versión en castellano del cuestionario 'Community of Inquiry'

2019 ◽  
Vol 1 (59) ◽  
Author(s):  
Belén Ballesteros Velázquez ◽  
Inés Gil-Jaurena ◽  
Javier Morentin Encina
Keyword(s):  
Interpersonal Relationships ◽  
Social Presence ◽  
Community Of Inquiry ◽  
Reliability And Validity ◽  
Point Of View ◽  
Three Dimensions ◽  
Validity And Reliability ◽  
On Line ◽  
Teaching Learning ◽  
Constructing Meaning

Presentamos el estudio de la fiabilidad y validez del cuestionario 'Community of Inquiry' (CoI) en su versión española. El modelo CoI concibe la enseñanza-aprendizaje en entornos on-line como proceso de indagación, a través del cual los participantes colaboran en el discurso y reflexión crítica para construir conocimiento personal y llegar a un entendimiento mutuo. Consecuentemente, el modelo CoI identifica la presencia de tres dimensiones: a) la presencia cognitiva, referida al grado en que los participantes son capaces de construir significado y conocimiento a través de la comunicación continua, la reflexión y la discusión; b) la social, definida como la habilidad de los participantes de identificarse con la comunidad, comunicarse y desarrollar relaciones interpersonales; c) la docente, referida al diseño, guía y dirección, por parte del profesorado, de procesos cognitivos y sociales con el propósito de lograr resultados de aprendizaje significativos en los estudiantes. La validación del cuestionario en el contexto de enseñanza a distancia español muestra resultados satisfactorios desde el punto de vista de la validez de constructo y la fiabilidad como consistencia interna, confirmando la utilidad e interés de este instrumento en investigaciones que pretendan analizar y mejorar el desarrollo de procesos educativos a través de comunidades de indagación. We present the study of the reliability and validity of the 'Community of Inquiry' (CoI) survey in its Spanish version. The CoI model conceives teaching-learning in on-line environments as a process of inquiry, through which the participants collaborate in the discourse and critical reflection to build personal knowledge and reach a mutual understanding. Consequently, the CoI model identifies the presence of three dimensions: a) the cognitive presence, referred to the degree to which the participants are capable of constructing meaning and knowledge through continuous communication, reflection and discussion; b) the social presence, defined as the ability of participants to identify with the community, communicate and develop interpersonal relationships; c) the teaching presence, referred to the design, guidance and direction, on the part of the faculty, of cognitive and social processes with the purpose of achieving significant learning results in the students. The validation of the survey in the context of Spanish distance learning shows satisfactory results from the point of view of construct validity and reliability as internal consistency, confirming the usefulness and interest of this instrument in investigations that seek to analyze and improve the development of educational processes through communities of inquiry.

A shot in the dark: the silent quest of a free-flying phonotactic fly

2001 ◽  
Vol 204 (6) ◽  
pp. 1039-1052 ◽  
Author(s):  
P. Muller ◽  
D. Robert
Keyword(s):  
Natural Selection ◽  
Sound Source ◽  
Tracking System ◽  
Video Tracking ◽  
Sound Stimulus ◽  
Three Dimensions ◽  
Infrared Video ◽  
On Line ◽  
Male Cricket ◽  
Video Tracking System

To reproduce, females of the parasitoid fly Ormia ochracea detect and localise a calling male cricket upon which they deposit their endoparasitic larvae. Calling male crickets are therefore subject to both sexual and natural selection by simultaneously attracting mates and phonotactic parasitoids. The possible strategy of song interruption employed by the cricket host to reduce his attractiveness to acoustic parasitoids was tested in the laboratory by examining the fly's phonotactic quest in response to synthetic cricket songs. Phonotactic flight trajectories were recorded in three dimensions with a stereo infrared video tracking system while the sound stimulus was controlled on-line as a function of the fly's position in space. Within a single flight, three distinct phases could be observed: a take-off phase, a cruising phase, during which course and altitude were rather constant, and a landing phase characterised by a spiralling descent towards the sound source. The flies showed remarkable phonotactic accuracy in darkness; they landed at a mean distance of 8.2 cm from the centre of the loudspeaker after a flight distance of approximately 4 m. The present data illustrate the fly's surprising ability to gauge the direction and distance of a sound source in three dimensions and, subsequently, to find it in darkness and silence.

scholarly journals Self-Administered Information Sharing Framework Using Bioinspired Mechanisms

Complexity ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Huibo Bi ◽  
Yanyan Chen ◽  
Wen-Long Shang ◽  
Chengcheng Song ◽  
Wenbo Huang
Keyword(s):  
Information Sharing ◽  
Information Acquisition ◽  
Heuristic Algorithms ◽  
Data Traffic ◽  
Data Packets ◽  
Battery Power ◽  
On Line ◽  
Save Energy ◽  
Bioinspired Algorithms ◽  
Information Collecting

The promising potential of distributed and interconnected lightweight devices that can jointly generate superior information-collecting and problem-solving abilities has long fostered various significant and ubiquitous techniques, from wireless sensor networks (WSNs) to Internet of Things (IoT). Although related applications have been widely used in different domains in attempting to collect and harness the ever-growing information flows, one major issue that impedes the further advancement of WSNs or IoT-based applications is the restricted battery power. Previous research mainly focuses on investigating novel protocols to save energy by reducing data traffic with the aid of optimal or heuristic algorithms. However, data packet behaviours and significant parameters involved are mostly preconfigured in a supervised-learning fashion rather than using an unsupervised learning paradigm and therefore may not adapt to uncertain or fast-changing environments. Hence, this paper concentrates on optimising the behaviours of data packets and significant parameters in a widely tested routing protocol, namely, Cognitive Packet Network (CPN), with the aid of several bio-inspired algorithms to increase the efficiency of energy usage and information acquisition. Two novel packet behaviours are introduced, and an on-line parameter calibration scheme is proposed to realise packet time-to-live (TTL) adjustment and rate adaptation. The simulation results show that the introduction of the bioinspired algorithms can improve the efficiency of information sharing and reduce the energy consumption.

High-resolution scanning electron microscopy (HRSEM) of mitochondria from various rat tissues

1988 ◽  
Vol 46 ◽  
pp. 14-15
Author(s):  
P.J. Lea ◽  
M.J. Hollenberg
Keyword(s):  
Electron Microscopy ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Rat Hepatocytes ◽  
Three Dimensions ◽  
Objective Lens ◽  
Rat Tissues ◽  
Thin Sections ◽  
Reconstruction Methods ◽  
Scanning Electron

Our current understanding of mitochondrial ultrastructure has been derived primarily from thin sections using transmission electron microscopy (TEM). This information has been extrapolated into three dimensions by artist's impressions (1) or serial sectioning techniques in combination with computer processing (2). The resolution of serial reconstruction methods is limited by section thickness whereas artist's impressions have obvious disadvantages.In contrast, the new techniques of HRSEM used in this study (3) offer the opportunity to view simultaneously both the internal and external structure of mitochondria directly in three dimensions and in detail.The tridimensional ultrastructure of mitochondria from rat hepatocytes, retinal (retinal pigment epithelium), renal (proximal convoluted tubule) and adrenal cortex cells were studied by HRSEM. The specimens were prepared by aldehyde-osmium fixation in combination with freeze cleavage followed by partial extraction of cytosol with a weak solution of osmium tetroxide (4). The specimens were examined with a Hitachi S-570 scanning electron microscope, resolution better than 30 nm, where the secondary electron detector is located in the column directly above the specimen inserted within the objective lens.

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