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检索条件"机构=Department of Mechanics and Programming Technical University of Cluj-Napoca Cluj-Napoca"

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Distributed objects and join methods: Design issues and operational semantics

Distributed objects and join methods: Design issues and oper...

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2010 IEEE 6th International Conference on Intelligent Computer Communication and Processing, ICCP10

作者： Todoran, Eneia Nicolae Simina, Dorin Bâlc, Mirel Zaharia, Dan Andrei Department of Computer Science Technical University of Cluj-Napoca 28 Baritiu Street 400027 Cluj-Napoca Romania

ISBN: (纸本)9781424482306

We introduce DJ# - a language that can be used to program a Peer-to-Peer network using object-oriented techniques and Join methods. The object creation primitive of DJ# has two parameters, a class name and a peer name, allowing the programmer to create instances of any class on any node of the network. In the object-oriented programming spirit, DJ# objects can communicate by sending and receiving messages. As in Join Java or Polyphonic C#, both synchronous and asynchronous messages can be transmitted between distributed objects. The DJ# model provides a form of dynamic connectivity of interacting objects that can use Join methods to implement various communication mechanisms. The paper presents the design rationales and a formal operational semantics for DJ#. © 2010 IEEE.

关键词： Peer to peer networks

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Vital dental pulp stress analysis during periodontal resorption

Vital dental pulp stress analysis during periodontal resorpt...

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World Congress on Engineering 2016, WCE 2016

作者： Moga, R.A. Chiorean, C.G. Department of Odontology Faculty of Dental Medicine University of Medicine and Pharmacy Iuliu Hatieganu Cluj-Napoca No.33 Motilor street Cluj400001 Romania Department of Structural Mechanics Technical University Cluj-Napoca Cluj Romania

ISBN: (纸本)9789881925305

Maintaining the pulp vitality during the orthodontic treatment phase is an important aim during the treatment of periodontal disease. It was hypothesized that due to periodontal resorption the same amount of force determines an increase of maximum stress in the dental pulp, which might affect its vitality. The objective was to quantify stress produced in the dental pulp at 10 different bone levels under transverse and vertical orthodontic loadings, for the special case of a two roots second mandibular premolar. The alveolar bone and PDL has been reduced in height by 10%, from 0% to 90%, and subjected to 6 constant loadings of 1-10 N/mm2. The von Mises stress values for the dental pulp were calculated. For 0% bone loss, a 1 N/mm2 intrusive load produced a maximum stress of 5.4E-05N/mm2. When resorption reached 50% the stress value was of 14.3E-05N/mm2 while for the 90% level the stress was 53.5E-05N/mm2. After 30% periodontal resorption (5.7 mm) the stress significantly increase and is assumed to be the starting point for dramatic changes in stress level. The mesialdistal loadings produced the highest stress values in the vital dental pulp for the 80% bone loss. The periodontal resorption determined a steady increase in the equivalent stress. Results lead to the conclusion that application of higher forces will determine higher stresses in the root apical third, which might affect the vitality of the pulp during the orthodontic treatment phase, and could worsen the periodontal problems.

关键词： Finite element method

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Modeling and simulation of current-controlled PWM strategy with regular sampling for constant switching frequency

Modeling and simulation of current-controlled PWM strategy w...

引用

2012 7th International Conference and Exposition on Electrical and Power Engineering, EPE 2012

作者： Pop, Andrei Victor Imecs, Maria Incze, Ioan Lov Negrea, Cornel Alin Department of Electrical Machines and Drives Faculty of Electrical Engineering Technical University of Cluj-Napoca Cluj-Napoca Romania

ISBN: (纸本)9781467350013

This paper presents an appropriate digital current-controlled pulse width modulation method for limiting the switching frequency in voltage-source PWM inverters. The method is suitable for numerical implementation generating switching instants only at constant sampling period given by a fixed clock frequency. To guarantee sequential voltage vector selection which allows only one of the inverter legs to change its state during the sample period, the sampling signal given by fixed clock is shifted 120 degree each other. The validation of proposed current-controlled PWM strategy with regular sampling is illustrated by means of simulation, in programming and simulation environment MATLAB Simulink®, Also, the proposed current-control technique will be compared with other PWM techniques from point of view of total harmonic distortion. © 2012 IEEE.

关键词： Pulse width modulation

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Nonlinear neuro-predictive control of a miniature coaxial helicopter

Nonlinear neuro-predictive control of a miniature coaxial he...

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Mediterranean Conference on Control and Automation

作者： Muresan, Bogdan Pop, Cristina Nascu, Ioan Crisan, Ruben Faculty of Automation and Computer Science Automation Department Technical University of Cluj-Napoca Cluj-Napoca 400027 Romania

ISBN: (纸本)9781457701252

In this paper the design of a nonlinear predictive controler based on a neural network model for a coaxial miniature helicopter is presented. The first step is the development of neural network models for all four movements of the helicopter. Recurrent dynamic networks are trained to predict accurately the behaviour of the helicopter. Further, this neural models are used for prediction in order to design nonlinear predictive controllers for yaw, altitude, pitch and roll control. When computing the optimal control signals, contraints are considered using a quadratic programming optimization technique. © 2011 IEEE.

关键词： Helicopters

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Progressive collapse risk and robustness of low-rise reinforced concrete buildings

Progressive collapse risk and robustness of low-rise reinfor...

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11th International Conference on Computational Structures Technology, CST 2012

作者： Bredean, L. Botez, M. Ioani, A. Department of Structural Mechanics Faculty of Civil Engineering Technical University of Cluj-Napoca Romania

ISBN: (纸本)9781905088546

The potential for progressive collapse of low-rise RC framed structures is evaluated in this paper. The analyses are based on the linear static procedure and acceptance criteria specified in GSA 2003 Guidelines. The main parameters of the program are the building height (three and six storeys), seismicity of the area, and the type of damage scenarios used in the analysis. The results revealed that the progressive collapse potential decreases as the number of storeys increases and, for the first time in the technical literature, demonstrates in a quantitative manner, differentiated with respect to the number of storeys, the positive effect of seismic design and detailing on the progressive collapse resistance of reinforced concrete framed structures. © Civil-Comp Press, 2012.

关键词： Seismic design

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V-beam thermal actuator’s performance analysis using digital image correlation 6

V-beam thermal actuator’s performance analysis using digita...

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6th International Conference on Advanced Concepts in Mechanical Engineering, ACME 2014

作者： Chiorean, Radu Dudescu, Mircea Cristian Pustan, Marius Hardau, Mihail Technical University of Cluj-Napoca Department of Mechanical Engineering B-dul.Muncii 103-105 Cluj-Napoca Romania Technical University of Cluj-Napoca Department of Mechanical Systems Engineering B-dul.Muncii 103-105 Cluj-Napoca Romania

ISBN: (纸本)9783038352716

This paper analyses the influence of the V-beam thermal actuator’s geometrical parameters on its mechanical behavior. Experimental measurements were performed using Digital Image Correlation (DIC), which is a gray scale value tracking algorithm that evaluates the position shift of a pixel between at least two images taken at different deformation stages. These results are compared to multi-physics simulation data obtained using Finite Element Analysis (FEA) as well as to analytical values based on the electro-thermal and thermo-mechanical presented models. © (2014) Trans Tech Publications, Switzerland.

关键词： Image correlation

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Periodontal ligament stress analysis during periodontal resorption

Periodontal ligament stress analysis during periodontal reso...

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World Congress on Engineering 2016, WCE 2016

ISBN: (纸本)9789881925305

Conservation of the PDL(periodontal ligament) height during the orthodontic treatment phase is an important aim during the treatment of periodontal disease. It was hypothesized that due to periodontal resorption, the same amount of force determines an increase of maximum stress in the PDL, which might affect its dimensions. The objective was to quantify stress produced in the PDL at 10 different bone levels under transverse and vertical orthodontic loadings, for the special case of a two roots second mandibular premolar. The alveolar bone and PDL has been reduced in height by 10%, from 0% to 90%, and subjected to 6 constant loadings of 1-10 N/mm2. The von Mises stress values for the PDL were calculated. For 0% bone loss, a 1 N/mm2 intrusive load produced a maximum stress of 0.08 N/mm2. For 50% resorption the stress was 0.41N/mm2 while for the 90% level the stress was 2.96 N/mm2. For the 0-80% resorption the mesio-distal load produced the highest stress values. The stress gradually increased along with the PDL and bone height loss, but declined steadily from the cervical to the apical level. Approximately 5.7mm (30%) resorption is assumed to be the starting point for dramatic changes in stress level. Results lead to the conclusion that application of higher forces will determine higher stresses in the cervical level which might affect the height of the PDL during the orthodontic treatment phase, and could worsen the periodontal problems.

关键词： Finite element method

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Parameter identification and modeling of a pneumatic proportional valve with applicability in control design of servo-pneumatic systems 6

Parameter identification and modeling of a pneumatic proport...

引用

6th International Conference on Advanced Concepts in Mechanical Engineering, ACME 2014

作者： Rad, Ciprian-Radu Hancu, Olimpiu Maties, Vistrian Lapusan, Ciprian Technical University of Cluj-Napoca Department of Mechatronics and Machine Dynamics B-dul Muncii Cluj-Napoca Romania

ISBN: (纸本)9783038352716

The key element in a servo-pneumatic actuation system is the control valve. This paper presents a more practical method for parameter identification and modeling the flow characteristic of a 5/3 pneumatic proportional valve. Simulation and experimental results are in agreement and the model of the valve could be used in high-accuracy positioning control design of servo-pneumatic systems. © (2014) Trans Tech Publications, Switzerland. All Rights Reserved.

关键词： Identification (control systems)

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Digital image correlation method applied to material testing 26

Digital image correlation method applied to material testing

引用

26th Danubia-Adria Symposium on Advances in Experimental mechanics

作者： Dudescu, Mircea Botean, Adrian Hrdu, Mihail Technical University of Cluj-Napoca Faculty of Mechanics Department of Strength of Materials Str. Const. Daicoviciu nr. 15 Cluj-Napoca Romania

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The use of bone-like materials in skull base traumatology 6

The use of bone-like materials in skull base traumatology

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6th International Conference on Biomaterials, Tissue Engineering and Medical Devices, BiomMedD 2014

作者： Ilea, Aranka Butnaru, Anca Sfrângeu, Silviu Dudescu, Mircea Cristian Câmpian, Radu Septimiu Tombitaş, Veronica Elena Albu, Silviu Iuliu Haţieganu University of Medicine and Pharmacy Cluj-Napoca Romania Faculty of Dental Medicine Department of Oral Rehabilitation Oral Health and Dental Office Management Cluj-Napoca Romania Faculty of Medicine Department of Radiology Cluj-Napoca Romania Technical University Cluj-Napoca Faculty of Mechanics Department of Mechanical Engineering Cluj-Napoca Romania Faculty of Dental Medicine Department of Cervicofacial and ENT Surgery Cluj-Napoca Romania

ISBN: (纸本)9783038354321

The mastoid has many functional roles that are well known in the literature. Less studied is the role of the mastoid in kinetic energy absorption during head trauma. The work hypothesis of this study was the question whether the mastoid obliteration with bone-like material plays a role in skull base traumatology during occipital trauma. The study was approved by the Ethics Committee of the university of Medicine and Pharmacy "Iuliu Haţieganu" from cluj-napoca and was performed on a formolized cephalic extremity. The calvaria was removed through a horizontal section in the upper third of the lambdoid suture, and the brain was also removed. The mastoid cells of the left temporal bone were removed by external approach. The resulting neocavity was filled with a mixture of calcium carbonate, white gypsum and hydroxyapatite. The mastoid cells of the right temporal bone remained intact. The occipital region of the cephalic extremity was impacted by a spherical object attached to a pendulum arm. Temporal bone fractures were evaluated by CT examination. The cephalic extremity was initially impacted at a speed of 3.55m/s, with a kinetic energy of 56.71J, which caused a fracture with depression in the occipital region, without causing temporal bone fracture. Subsequently, the same cephalic extremity was impacted at a speed of 4.13m/s, with a kinetic energy of 76.75J, which produced occipital comminuted fracture and right petrous apex fracture. During the occipital impact on the studied cephalic extremity, the obliterated mastoid may play a higher role in protecting vital structures than the native mastoid. © (2015) Trans Tech Publications, Switzerland.

关键词： Kinetic energy

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