scholarly journals The list algorithms accuracy characteristics improvement based on Krohn’s algorithm and its modifications

2021 ◽  
Vol 2131 (2) ◽  
pp. 022122
Author(s):  
V G Kobak ◽  
O A Zolotykh ◽  
I A Zolotykh ◽  
A V Poliev
Keyword(s):  
Experimental Approach ◽  
Heuristic Algorithms ◽  
Critical Path ◽  
Main Idea ◽  
Initial Distribution ◽  
Distribution Problem ◽  
Uniform Loading ◽  
Suboptimal Solution ◽  
Processor Cores

Abstract The research of algorithms for uniform loading of devices for homogeneous information processing systems is a very important science-intensive task. An experimental approach was chosen for the research. This is primarily due to the fact that the analytical solution of the distribution problem gives solutions that are far from reality, since it is unable to take into account many factors that affect the computing machine during its operation. The aim of this research is to improve the accuracy characteristics of the list algorithms through the use of heuristic algorithms, such as Krohn’s algorithm and its modifications. This made it possible to obtain a more even distribution of tasks among executive devices, which can be networked workstations, processors or processor cores. The work uses list algorithms, such as the Critical Path algorithm and Pashkeev’s algorithm, as well as heuristic algorithms - Krohn’s algorithm and its modifications. The main idea of the research is to obtain the best suboptimal solution by improving the quality of the resulting distribution. In this case, with the help of the list algorithms, the initial distribution is formed, and its refinement is carried out through the application of the Krohn’s algorithm and its modifications. In fact, in the work, a number of symbiotic algorithms are examined and analyzed. For this, many computational experiments were carried out and a large amount of output data were collected, on the basis of which conclusions were drawn about the effectiveness of the solution obtained for each symbiotic group and for all groups as a whole.

Qualitŕ della vita e invecchiamento della popolazione. Materiali per un'ipotesi alternativa alla questione pensionistica

2009 ◽  
pp. 67-91
Author(s):  
Adele Bianco
Keyword(s):  
Quality Of Life ◽  
Life Quality ◽  
Main Idea ◽  
Living Condition ◽  
Climate And Environmental Change ◽  
Safety And Health ◽  
Positive Ageing ◽  
The Impact ◽  
Main Factor

The topic of this article is quality of life and ageing process specially focused on today young generations and their coming retirement situation. The main idea is that quality of life is increasing, that means longer, safer and better living condition; consequently positive ageing processes mean also reforming retirement sector. The hypothesis carried out in this paper is an alternative one. Despite of the positive trends, we describe how three main factor of nowadays life are, on the contrary, turning into worse condition the future of young generations and their coming life situation. Firstly we consider the socio-economic aspects, the impact on health and the implications connected with precarious work. Secondly we consider pollution and its effects on health, life quality and life expectation. Thirdly we pay attention about climate and environmental change and their effect on health, life quality and expectation. In conclusion, the retirement future of today young generations may be very different (worse) than expected. The paper in based on WHO, IPCC and European Agency for Safety and Health at Work data and reports.Key words: Young generations; Coming quality of life; Population ageing and future of retirement question.Parole chiave: Giovani generazioni; Qualitŕ della vita; Invecchiamento della popolazione e pensioni.

Dependence of Early Engineering Concepts on Information Characteristics

1996 ◽  
Author(s):  
Willem G. Knoop ◽  
Ernest J. J. van Breemen ◽  
Joris S. M. Vergeest ◽  
Tjamme Wiegers
Keyword(s):  
Conceptual Design ◽  
Experimental Approach ◽  
Information Analysis ◽  
Experiment Data ◽  
Computer Tools ◽  
Conceptual Design Phase ◽  
Information Characteristics ◽  
Early Engineering ◽  
Activity Information

Abstract The expectations of computer tools to support the conceptual design phase are not yet met. An experimental approach to discover the use of information in conceptual design will give a realistic insight of the information requirements. This can be used to specify future computer support systems. A method to observe the use of information in a conceptual design process has recently been developed. The method has been tested and fine-tuned through the observation of 10 design sessions. Valuable empirical data resides from this experiment. Data has been analyzed in several perspectives. This paper presents the results of the activity/information analysis of the experiment in relation with the quality of the design concept. For the latter a rating system has been defined to quantify this. We have found a significant positive correlation of the amount of information that is communicated and the quality of the design. Furthermore a discussion is given on the relation between information and the activities of the designer. Analysis activities are more communication intensive compared to synthesis and evaluation tasks.

SPATIAL ASPECTS OF THE REGION’S SUSTAINABLE DEVELOPMENT

2021 ◽  
Vol 1 (64) ◽  
pp. 81-88
Author(s):  
Tamara V. Uskova ◽  
Keyword(s):  
Sustainable Development ◽  
Rural Areas ◽  
Main Idea ◽  
State Regulation ◽  
Spatial Factor ◽  
National Settlement ◽  
National Settlement System ◽  
High Level ◽  
The Town

One of the most relevant issues causing concern of the world community is the ensurance of sustainable development. The problem was raised in the second half of the 20th century and has not been solved up to the present yet. The main idea of the article is to consider the spatial factor of sustainable development. The author shows that there is a high level of territories’ socio-economic differentiation in the Russian Federation. The problem of increasing polarization both between the center and periphery, and between the town and countryside has become particularly urgent. Rural areas are significantly lagging behind in terms of the population’s level and quality of life, and the rates of socio-economic development. The trends of rural extinction are intensifying and, as a result, there emerge the sparsity of economic space, and the decrease in stability of the national settlement system and development of countries as a whole. The increase of socio-economic problems in rural areas requires strengthening of the state regulation concerning the territories’ spatial development

An Intelligent Traffic Engineering Method over Software Defined Networks for Video Surveillance Systems Based on Artificial Bee Colony

2016 ◽  
Vol 12 (4) ◽  
pp. 45-62 ◽  
Author(s):  
Reza Mohammadi ◽  
Reza Javidan
Keyword(s):  
Video Surveillance ◽  
Traffic Engineering ◽  
Surveillance System ◽  
Artificial Bee Colony ◽  
Heuristic Algorithms ◽  
Optimal Solution ◽  
Video Data ◽  
Surveillance Systems ◽  
Bee Colony

In applications such as video surveillance systems, cameras transmit video data streams through network in which quality of received video should be assured. Traditional IP based networks cannot guarantee the required Quality of Service (QoS) for such applications. Nowadays, Software Defined Network (SDN) is a popular technology, which assists network management using computer programs. In this paper, a new SDN-based video surveillance system infrastructure is proposed to apply desire traffic engineering for practical video surveillance applications. To keep the quality of received videos adaptively, usually Constraint Shortest Path (CSP) problem is used which is a NP-complete problem. Hence, heuristic algorithms are suitable candidate for solving such problem. This paper models streaming video data on a surveillance system as a CSP problem, and proposes an artificial bee colony (ABC) algorithm to find optimal solution to manage the network adaptively and guarantee the required QoS. The simulation results show the effectiveness of the proposed method in terms of QoS metrics.

The Playout Control Management

2011 ◽  
pp. 689-702
Author(s):  
Mirko Luca Lobina ◽  
Luigi Atzori ◽  
Fabrizio Boi
Keyword(s):  
Quality Of Service ◽  
Service Provider ◽  
Service Providers ◽  
State Of The Art ◽  
Main Idea ◽  
The State ◽  
Ip Telephony ◽  
Open Standard ◽  
Control Management

IP Telephony provides a way for an enterprise to extend consistent communication services to all employees, whether they are in main campus locations, at branch offices, or working remotely, also with a mobile phone. IP Telephony transmits voice communications over a network using open standard-based Internet protocols. This is both the strength and weakness of IP Telephony as the involved basic transport protocols (RTP, UDP, and IP) are not able to natively guarantee the required application quality of service (QoS). From the point of view of an IP Telephony Service Provider this definitely means possible waste of clients and money. Specifically the problem is at two different levels: i) in some countries, wherelong distance and particularly international call tariffs are high, perhaps due to a lack of competition or due to cross subsidies to other services, the major opportunity for IP Telephony Service Providers is for price arbitrage. This means working on diffusion of an acceptable service, although not at high quality levels; ii) in other countries, where different IP Telephony Service Providers already exist, the problem is competition for offering the best possible quality. The main idea behind this chapter is to analyze specifically the state of the art playout control strategies with the following aims: i) propose the reader the technical state of the art playout control management and planning strategies (overview of basic KPIs for IP Telephony); ii) compare the strategies IP Telephony Service Provider can choose with the aim of saving money and offering a better quality of service; iii) introduce also the state of the art quality index for IP Telephony, that is a set of algorithms for taking into account as many factors as possible to evaluate the service quality; iv) provide the reader with examples on some economic scenarios of IP Telephony.

Experimental Evaluation of Surface Roughness in Orthogonal Micro-Milling Processes

2012 ◽  
Vol 217-219 ◽  
pp. 1912-1916
Author(s):  
Ji Hua Wu
Keyword(s):  
Surface Roughness ◽  
Feed Rate ◽  
Experimental Approach ◽  
Critical Role ◽  
Cutting Speed ◽  
Chip Thickness ◽  
Micro Milling ◽  
Surface Model ◽  
Material Grain Size

Surface roughness plays a critical role in evaluating and measuring the surface quality of a machined product. Two workpiece materials have been investigated by experimental approach in order to gain a better understanding of their influence on the obtained surface roughness in the micro-milling processes. The experimental results show that: surface topography is completely different for different materials at the same cutting speed and feed rate; surface roughness increases with an increase of material grain size. Surface roughness decreases to a lowest value, and then increases with an increase of the feed rate. A new surface model to illustrate the influence of material and uncut chip thickness was developed. The model has been experimentally validated and shows more promising results than Weule’s model.

On the Stereoscopic Composition of Wide Baseline Stereo Pairs

2009 ◽  
Author(s):  
Chensheng Wang ◽  
Xiaochun Wang ◽  
Joris S. M. Vergeest ◽  
Tjamme Wiegers
Keyword(s):  
Binocular Vision ◽  
Main Idea ◽  
Depth Information ◽  
Stereoscopic Image ◽  
Stereoscopic Images ◽  
Wide Baseline Stereo ◽  
Before And After ◽  
Depth Cue ◽  
A Minor

Wide baseline cameras are broadly utilized in binocular vision systems, delivering depth information and stereoscopic images of the scene that are crucial both in virtual reality and in computer vision applications. However, due to the large distance between the two cameras, the stereoscopic composition of stereo pairs with wide baseline is hardly to fit the human eye parallax. In this paper, techniques and algorithms for the stereoscopic composition of wide baseline stereo pairs in binocular vision will be investigated. By incorporating the human parallax limitation, a novel algorithm being capable of adjusting the wide baseline stereo pairs to compose a high quality stereoscopic image will be formulated. The main idea behind the proposed algorithm is, by simulating the eyeball rotation, to shift the wide baseline stereo pairs closer to each other to fit the human parallax limit. This makes it possible for the wide baseline stereo pairs to be composed into a recognizable stereoscopic image in terms of human parallax with a minor cost of variation in the depth cue. In addition, the depth variations before and after the shifting of the stereo pairs are evaluated by conducting an error estimation. Examples are provided for the evaluation of the proposed algorithm. And the quality of the composed stereoscopic images proves that the proposed algorithm is both valid and effective.

The Issue of Increasing the Products Durability Made of Fine-Grain Concrete

2018 ◽  
Vol 931 ◽  
pp. 537-543
Author(s):  
Elizaveta O. Lotoshnikova ◽  
Leonid M. Usepyan ◽  
Valeriya N. Telegina ◽  
Elzara O. Tsybenko
Keyword(s):  
Experimental Approach ◽  
Raw Materials ◽  
Practical Implementation ◽  
Technological Method ◽  
Fine Grain ◽  
Materials Used

The article presents a technique for assigning the composition of the agglutinant sand, which is based on the calculation and experimental approach to determining the composition, taking into account the quality of raw materials used and the requirements for the properties of concrete products produced. The obtained results served as the basis for the practical implementation of the proposed technological method of increasing the small-sized products durability made of fine-grain concrete.

scholarly journals Nonlinear Nonconvex Optimization by Evolutionary Algorithms Applied to Robust Control

2009 ◽  
Vol 2009 ◽  
pp. 1-21 ◽  
Author(s):  
Joaquín Cervera ◽  
Alfonso Baños
Keyword(s):  
Robust Control ◽  
Evolutionary Algorithms ◽  
Optimization Problem ◽  
Main Idea ◽  
Evolutionary Process ◽  
Open Loop ◽  
Gain Function ◽  
Local Optima ◽  
Suboptimal Solution ◽  
Fixed Structure

This work focuses on the problem of automatic loop shaping in the context of robust control. More specifically in the framework given by Quantitative Feedback Theory (QFT), traditionally the search of an optimum design, a non convex and nonlinear optimization problem, is simplified by linearizing and/or convexifying the problem. In this work, the authors propose a suboptimal solution using a fixed structure in the compensator and evolutionary optimization. The main idea in relation to previous work consists of the study of the use of fractional compensators, which give singular properties to automatically shape the open loop gain function with a minimum set of parameters, which is crucial for the success of evolutionary algorithms. Additional heuristics are proposed in order to guide evolutionary process towards close to optimum solutions, focusing on local optima avoidance.

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