bluuebunny/crossref_metadata_2025_split huggingface dataset:
Design of systems with extremal dynamic properties
Authors: Górecki H. , Zaczyk M. 
Published: October 2013

Abstract
In this article the problem of determination of coefficients a1, a2, . . . , an of the characteristic equation which yield required extremal values of the solution x(t) at extremal values τ of time is solved. The extremal values of x(t) and τ are treated as functions of the roots s1, s2, . . . , sn. The analytical formulae enable to design the systems with prescribed dynamic properties. The zeros and poles can be located using the known method.
The extremal dynamic error x(t) is the most important property of the behaviour of the system. This extremal value of the dynamic error has fundamental role in the chemical industry where for example overrising temperature or pressure can lead to an explosion.
A second very important property is the extremal time τ connected with the extremal value of the error. This property is essential in the electroenergetic system, which can be destroyed by the overvoltages waves.
Modeling and design of role engineering in development of access control for dynamic information systems
Authors: Poniszewska-Marańda A. 
Published: October 2013

Abstract
Nowadays, the growth and complexity of functionalities of current information systems, especially dynamic, distributed and heterogeneous information systems, makes the design and creation of such systems a difficult task and at the same time, strategic for businesses. A very important stage of data protection in an information system is the creation of a high level model, independent of the software, satisfying the needs of system protection and security. The process of role engineering, i.e. the identification of roles and setting up in an organization is a complex task.
The paper presents the modeling and design stages in the process of role engineering in the aspect of security schema development for information systems, in particular for dynamic, distributed information systems, based on the role concept and the usage concept. Such a schema is created first of all during the design phase of a system. Two actors should cooperate with each other in this creation process, the application developer and the security administrator, to determine the minimal set of user’s roles in agreement with the security constraints that guarantee the global security coherence of the system.
Prediction of corrections for the Polish time scale UTC(PL) using artificial neural networks
Authors: Luzar M. , Sobolewski Ł. , Miczulski W. , Korbicz J. 
Published: October 2013

Abstract
In this paper, the effectiveness of using Artificial Neural Networks (ANNs) for predicting the corrections of the Polish time scale UTC(PL) (Universal Coordinated Time) is presented. In particular, prediction results for the different types of neural networks, i.e., the MLP (MultiLayer Perceprton), the RBF (Radial Basis Function) and the GMDH (Group Method of Data Handling) are shown. The main advantages and disadvantages of using such types of neural networks are discussed. The prediction of corrections is performed using two methods: the time series analysis method and the regression method. The input data were prepared suitable for the above mentioned methods, based on two time series, ts1 and ts2. The designation of prediction errors for specified days and the influence of data quantity for the prediction error are considered. The paper consists of five sections. After Introduction, in Sec. 2, the theoretical background for different types of neural networks is presented. Section 3 shows data preparation for the appropriate type of neural network. The experimental results are presented in Sec. 4. Finally, Sec. 5 concludes the paper.
PI observer stability and application in an induction motor control system
Authors: Białoń T. , Lewicki A. , Pasko M. , Niestrój R. 
Published: October 2013

Abstract
The paper discusses the problem of stability of a proportional-integral Luenberger observer, designated for the state variables reconstruction of a linear, time-invariant dynamical system. It is proven, that there exists such a class of observed systems, for which the observer is always unstable, independently of its gains. Stability can be provided in every possible case after application of proposed modifications to the structure of the observer. It is proven, that stability of the modified observer depends only on its gains. It is shown, that an induction motor is the exemplary observed system, for which application of the unmodified observer is impossible due to its lack of stability, while the modified observer provides proper operation of the control system. Finally, some experimental results are presented, obtained in the multiscalar control system of the induction motor, equipped with the modified proportional-integral observer.
Modified neuro-fuzzy TSK network and its application in electronic nose
Authors: Osowski S. , Brudzewski K. , Tran Hoai L. 
Published: October 2013

Abstract
The paper develops the modified structure of the Takagi-Sugeno-Kang neuro-fuzzy network with a theoretical basis for its adaptation. The simplified structure follows from the basic theoretical considerations concerning the way of creating the inference rules. The important point of this solution is the application of the fuzzy clustering algorithm to the input data. The efficiency of the proposed solution has been checked on the examples of regression and classification problems concerning the electronic nose.
CMOS implementation of an analogue median filter for image processing in real time
Authors: Jendernalik W. , Jakusz J. , Blakiewicz G. , Szczepański S. 
Published: October 2013

Abstract
An analogue median filter, realised in a 0.35 μm CMOS technology, is presented in this paper. The key advantages of the filter are: high speed of image processing (50 frames per second), low-power operation (below 1.25 mW under 3.3 V supply) and relatively high accuracy of signal processing. The presented filter is a part of an integrated circuit for image processing (a vision chip), containing: a photo-sensor matrix, a set of analogue pre-processors, and interface circuits. The analysis of the main parameters of the considered median filter is presented. The discussion of important limitations in the operation of the filter due to the restrictions imposed by CMOS technology is also presented.
GaInNAs quantum-well vertical-cavity surface-emitting lasers emitting at 2.33 μm
Authors: Piskorski Ł. , Sarzała R.P. 
Published: October 2013

Abstract
In the present paper, the comprehensive fully self-consistent optical-electrical-thermal-recombination model is used to determine the optimal structure of the possible GaInNAs quantum-well (QW) tunnel-junction (TJ) vertical-cavity surface-emitting lasers (VCSELs) with single-fundamental-mode operation at 2.33 μm wavelength suited for carbon monoxide sensing applications. From among various considered structures, the diode laser with 4-μm TJ and two 6-nm Ga0.15In0.85N0.015As0.985/Ga0.327In0.673As0.71P0.29 QWs has the lowest threshold current and seems to be optimal for the above applications. Higher threshold currents are obtained for Ga0.15In0.85N0.015As0.985/Al0.138- Ga0.332In0.530As QW structures but the latter can be grown in reactors without P source which are used for fabrication of GaAs-based devices. Both the modelled VCSELs offer a very promising room temperature continuous wave performance and may represent an alternative choice to GaSb-based lasers.
The relationship between physical fitness and quality of life in adults and the elderly
Authors: Sławińska Teresa , Posłuszny Paweł , Rożek Krystyna 
Published: October 2013

PurposeThe aim of this study was to determine the relationships between physical fitness and various aspects of quality of life in middle-aged adults and the elderly.MethodsThe sample included 216 women and 43 men, living in a medium-sized city in Poland aged 50-84 years. Physical fitness was determined using a test battery specifically designed for the elderly (Senior Fitness Test); grip strength by the dominate hand was also measured. The short form of the WHOQOL-BR EF questionnaire was used to evaluate quality of life. Four domains (physical, psychological, social relationships, environment) of quality of life as well as overall quality of life and health were self-assessed.ResultsAmong the selected components of physical fitness measured in the study, the assessment of overall quality of life in women was related to upper limb strength and, depending on the quality of life domain, also with upper or lower body flexibility. In men, the only factor influencing their overall assessment was upper body flexibility, whereas cardiorespiratory efficiency was the only factor influencing their detailed self-assessment of the physical health domain. Additionally, the self-assessment of general health in men was significantly positively correlated with cardiopulmonary efficiency. In women, the general health assessment was correlated with upper limb strength and upper body flexibility.ConclusionsIt was concluded that after the fifth decade of life, physical fitness plays a greater role in improving the self-assessment of quality of life in women than men. Physical activity undertaken by middle-aged and elderly adults should focus on first improving cardiorespiratory efficiency and then strength and flexibility.
Physical activity and life satisfaction in blind and visually impaired individuals
Authors: Łabudzki Jakub , Tasiemski Tomasz 
Published: October 2013

PurposePhysical activity (PA) is known to have a positive influence on many physical and psychological aspects of human life. Despite the many benefits of an active lifestyle, the majority of adults in Western Europe do not perform regular PA, and this is especially so for adults with a disability, such as the blind and visually impaired. The purpose of this study was to assess the type and intensity of physical activity and subjective quality of life (life satisfaction) of blind and visually impaired individuals living in Poland and to analyze for potential differences in terms of their physical activity levels.MethodsThe short form International Physical Activity Questionnaire and the Life Satisfaction Questionnaire were administered to a sample of eighty-two individuals (mean age 38 years) with varying degrees of vision loss.ResultsThe study found that more than 50% of the respondents were classified as being highly active and that the total sample was “rather satisfied” with life “as a whole”. The level of PA performed was significantly positively correlated with the level of life satisfaction.ConclusionsPA increases the subjective quality of life in blind and visually impaired individuals.
The effects of a perturbation-based balance training on the reactive neuromuscular control in community-dwelling older women: a randomized controlled trial
Authors: Rossi Luciano Pavan , Pereira Rafael , Brandalize Michelle , Gomes Anna Raquel Silveira 
Published: October 2013

PurposeThe purpose of this study was to evaluate the effects of short-term perturbation-based balance training and a detraining period on postural control in older adults.MethodsA group of healthy older women were recruited and divided into two groups: an exercise group (EG, <i>n</i> = 21, age = 67.0 ± 2.0 y) that performed balance-based exercises three times a week over a sixweek period and a control group (CG, <i>n</i> = 20, age = 67.9 ± 3.1 y). Center-of-pressure displacement (CoP) and electromyographic data (EMG onset, time-to-peak and amplitude) were assessed during forward and backward perturbations for six leg muscles. All variables were analyzed before the training program began, at its end, and after a six-week period of detraining. A mixed ANOVA model was used to analyze the within- and between-subject results.ResultsA decrease in backward CoP displacement, EMG onset and time-to-peak of the ankle muscles, especially the tibialis anterior (TA) and gastrocnemius (MG), was observed. Improvement in muscle EMG amplitude for the ankle muscles (TA, MG and Soleus - SO) at the early phase (0-200 ms) of the perturbation test, with the SO also showing an increase in amplitude at the intermediate phase (201-400 ms). After the detraining period, only the TA muscle maintained an improvement in reaction time.ConclusionsPerturbation-based balance training improved neuromuscular responses such as muscle reaction time and ankle muscle activation and consequently aided the body’s ability to maintain correct center of pressure, although after a period of detraining this gain was not maintained for most of the assessed variables.
The climbing preferences of advanced rock climbers
Authors: Magiera Artur , Roczniok Robert 
Published: October 2013

PurposePrevious studies have broadened the knowledge about the general characteristics of rock climbing. However, there is a lack of research on rock climbers who are at a similar performance level but have different climbing preferences. The purpose of this study was to focus on what similarities and differences are present in the anthropometric, physiological, and training characteristics of advanced rock climbers.MethodsA group of 31 advanced Polish rock climbers volunteered to participate in the study. A questionnaire was administered to determine their climbing preferences. The participants’ anthropometric characteristics, physical fitness, and aerobic power were measured using standard methods.ResultsSimilarities were found among the climbers in terms of the training exercises they used, their preference for certain types of rock faces and rock handholds, and their participation in different types of climbing and other sports disciplines. Differences were found among various anthropometrical characteristics, physical fitness, and training exercise frequency between climbers who preferred different climbing styles (on-sight vs. redpoint) or climbing routes (“crux” vs. “endurance”).ConclusionsDuring the off-season, various training exercises were used, with the majority employing specialized forms of training (bouldering, repeating previously climbed routes, and leading routes in different styles). They practised on average 10 hours a week and preferred climbing overhanging walls with edge handholds. The best results the climbers achieved in on-sight climbing were in foreign countries and by individuals with high aerobic power measured by an arm ergometer test. Climbers who achieved better results in redpointing used the Campus board more frequently when training and completed their most difficult climbs in Poland. Additional differences were noted between climbers who preferred endurance routes and those who preferred shorter climbing efforts (crux routes), with the former presenting better finger flexor muscle endurance and greater muscle mass.
Distribution Network Reconfiguration Considering Power Losses and Outages Costs Using Genetic Algorithm
Authors: Nuhanović Amir , Hivziefendić Jasna , Hadžimehmedović Amir 
Published: October 2013

Abstract
This paper discusses the problem of finding the optimal network topological configuration by changing the feeder status. The reconfiguration problem is considered as a multiobjective problem aiming to minimize power losses and total interruptions costs subject to the system constraints: the network radiality voltage limits and feeder capability limits. Due to its complexity, the metaheuristic methods can be applied to solve the problem and often the choice is genetic algorithm. NSGA II is used to solve the multiobjective optimization problem in order to get Pareto optimal set with possible solutions. The proposed method has been tested on real 35 kV distribution network. The numerical results are presented to illustrate the feasibility of the proposed genetic algorithm.
Performance Evaluation of Virtualization Techniques for Control and Access of Storage Systems in Data Center Applications
Authors: Ahmadi Mohammad Reza 
Published: October 2013

Abstract
Virtualization is a new technology that creates virtual environments based on the existing physical resources. This article evaluates effect of virtualization techniques on control servers and access method in storage systems [1, 2]. In control server virtualization, we have presented a tile based evaluation based on heterogeneous workloads to compare several key parameters and demonstrate effectiveness of virtualization techniques. Moreover, we have evaluated the virtualized model using VMotion techniques and maximum consolidation. In access method, we have prepared three different scenarios using direct, semi-virtual, and virtual attachment models. We have evaluated the proposed models with several workloads including OLTP database, data streaming, file server, web server, etc. Results of evaluation for different criteria confirm that server virtualization technique has high throughput and CPU usage as well as good performance with noticeable agility. Also virtual technique is a successful alternative for accessing to the storage systems especially in large capacity systems. This technique can therefore be an effective solution for expansion of storage area and reduction of access time. Results of different evaluation and measurements demonstrate that the virtualization in control server and full virtual access provide better performance and more agility as well as more utilization in the systems and improve business continuity plan.
Enhancement in Steady State and Dynamic Performance of Direct Torque Control Induction Motor Drive
Authors: Singh Bhoopendra , Jain Shailendra , Dwivedi Sanjeet 
Published: October 2013

Abstract
An enhancement in dynamic performance of a traditional DTC drive can be achieved by a robust speed control algorithm while the steady state performance depends upon the switching strategy selected for minimization of torque ripples and an efficient flux control loop. In this paper a new torque ripple reduction technique with a modified look up table incorporating a larger number of synthesized non zero active voltage vectors is utilized to overcome the limitations of the conventionally controlled DTC drive. A fuzzy logic based speed controller and a low pass filter with tunable cutoff frequency for flux estimation is proposed in this paper. The proposed study is investigated through simulation and experimentally validated on a test drive.
ZVS Full–Bridge Based DC–DC Converter with Linear Voltage Gain According to Duty Cycle
Authors: Do Hyun-Lark 
Published: October 2013

Abstract
This paper presents a zero-voltage-switching (ZVS) full-bridge based DC-DC converter with linear voltage gain according to duty cycle. The proposed converter is based on an asymmetrical pulse-width-modulation (APWM) full-bridge converter which has various advantages over other converters. However, it has some drawbacks such as limited maximum duty cycle to 0.5 and narrow input range. The proposed converter overcomes these problems. The duty cycle is not limited and input voltage range is wide. Also, the ZVS operation of all power switches is achieved. Therefore, switching losses are significantly reduced and high-efficiency is obtained. Steady-state analysis and experimental results for the proposed converter are presented to validate the feasibility and the performance of the proposed converter.
Ocean Wave Measurement Using GPS Buoys
Authors: Joodaki G. , Nahavandchi H. , Cheng K. 
Published: October 2013

AbstractThe observation of ocean wave parameters is necessary to improve forecasts of ocean wave conditions. In this paper, we investigate the viability of using a single GPS receiver to measure ocean-surface waves, and present a method to enhance the accuracy of the estimated wave parameters. The application of high-pass filtering to GPS data in conjunction with directional wave spectral theory is a core concept in this article. Laboratory experiments were conducted to test the viability and accuracy measurements of wave parameters made by a single GPS receiver buoy. These tests identified an error of less than 1% for the rotational arm measurement (wave height) and an error of 1% in verifications of the wave direction and wave period, and showed a 0.488 s bias; this is sufficiently accurate for many specific purposes. These results are based on the best cut-off frequency value derived in this study. A moored-sea GPS buoy on the Taiwanese coast was used to estimate the GPS-derived wave parameters. Our results indicate that data from a single GPS receiver, processed with the presented method to reduce the error of the estimated parameters, can provide measurements of ocean surface wave to reasonable accuracy.
Sterilization Pattern of Dental Clinics in Rangpur City
Authors: Zaman MH , Ferdouse S , Mahbub S , Hossain MM 
Published: October 2013

Objective: The purpose of the study was to collect information to assess the level of sterilization practice and to identify the method of sterilization in the dental clinics in Rangpur city for further research and evaluation of the treatment quality. The study was carried out from January 2012 to June 2012 among 25 Dental clinics in Rangpur city for 6 months period. Results: Among the Respondents (16%) said draping sheet was supplied by the authority, while in 84% were not supplied. Distribution of Respondents by wearing theater shoes in the clinic were (96%) whereas (4%) didnt wear and 52% of the patients wore theater shoes in the clinic whereas 48% didnt wear it. Among the respondents 8% said plastic syringe was used in the clinic while 92% didnt use, Dental surgeons of 72% (18) of the total clinics used to wear disposable hand gloves where 28% didnt wear, 52% (13) of the Dental surgeons used to wear apron whereas 48% didnt. Among the clinics gloves were available in 92% for the service providers and 68% apron were available for the service providers. (24%) of the respondents used dettol to wash the floor, whereas 76% used savlon. Among all the operative rooms 8% used separate container to deposit sharp and other waste and 92% didnt use.(96%) of the clinics used chlorohexidine with cetrimide (savlon), and 4% (1)used Chlorohexidine with alchohol (hibisol) ). Among all the clinics 24% used sterilized Cotton and 76% didnt and 64% used sterilized gauge .(96%) of the clinics had availability of disinfectants. Only (4%) of the clinics had all the available sterilization methods. (96%) of the clinics had availability of surface disinfected. Only (8%) of the clinics had all the available instruments sterilizer. DOI: http://dx.doi.org/10.3329/bjdre.v3i2.16601 Bangladesh Journal of Dental Research & Education Vol.3(2) 2013: 1-4