bluuebunny/crossref_metadata_2025 huggingface dataset:
A Modeling Method of Equipment Systems Based on UPDM
Authors: Jing Wen Bo , Gao Yong Ming , Zhang Xue Bo
Published: June 2014

For large-scale equipment systems whose elements and internal structure are complex, traditional systems engineering methods can’t meet the requirements of the system modeling. In this paper, a kind of modeling method based on UPDM is developed to solve the complexity of equipment systems. This paper proceeds as follow. Firstly, analyze the mission of equipment systems; secondly, using a variety of views product describes the equipment systems; then, validate the systems structure by generating an executable model. Finally, an experiment about equipment systems modeling of space weaponry indicates the modeling method based on UPDM is effective.
A Real-Time Log Analyzer Based on MongoDB
Authors: Lv Qi , Xie Wei
Published: June 2014

Real-time log analysis on large scale data is important for applications. Specifically, real-time refers to UI latency within 100ms. Therefore, techniques which efficiently support real-time analysis over large log data sets are desired. MongoDB provides well query performance, aggregation frameworks, and distributed architecture which is suitable for real-time data query and massive log analysis. In this paper, a novel implementation approach for an event driven file log analyzer is presented, and performance comparison of query, scan and aggregation operations over MongoDB, HBase and MySQL is analyzed. Our experimental results show that HBase performs best balanced in all operations, while MongoDB provides less than 10ms query speed in some operations which is most suitable for real-time applications.
Design and Implementation of Mobile Client for Passenger Dynamic Travel Information Enquiry in Urban Rail Transit Network
Authors: Luo Qin , Ye Guan Di , Yang Jia Zhi , Mo Yi Kui
Published: June 2014

With rapid development and popularity of smart phone and mobile internet, mobile client software (APP) is widely used in every aspect of daily life. To improve the informatization and intellectualization of Urban Rail Transit passenger services, the paper brings forward a method of optimal travel choice for passengers based on “dynamic travel time”(hereinafter to be referred as DTT), and also takes advantage of the Android platform to develop an APP for dynamic travel information enquiry. The structure of the APP and the key problems to be resolved during the development process are introduced. As the APP is applied into practice, it can provide passengers with effective support.
Design of Three Dimensional Simulation Training System for Marine Hydraulic Crane
Authors: Jia Xiao Ping , Fu Jun , Yu Yong Yan
Published: June 2014

Aimed at limitations of traditional entitative marine hydraulic training systems such as encapsulation, concealment and high cost, three-dimensional simulation training system based on visual reality technology is proposed and implemented. Computer modeling software and Unity3d platform are used to create 3D visual scenes which include the wharf, ship, cranes, hydraulic pumps and motors, hydraulic piping and valves, etc. Simulation models can be driven by visual handle and pushbutton, internal movement of equipment can be observed through the translucent casing during roam. The results show that simulation effect is vivid and intuitive, the purpose of simulation training can be achieved, and it is beneficial to improve the teaching quality.
A Practical Method for Software Encryption
Authors: Yan Ke
Published: June 2014

Some technical measures should be taken for software protection in addition to the laws and regulations. Software encryption is a commonly used method. The main methods of software encryption are introduced here firstly, and the characteristics of different methods are given. Then the idea of encryption card based on computer system bus is put forward. The design of logical circuit for the concrete realization is shown and the key detection process is described. The key is generated by the port address dynamically with the encryption card. There are several key with multi port. The encryption card is difficult to decrypt and is with good stability, high reliability.
Scheme Design of Mobile Phone Campus GIS System Basing on the Windows Phone Platform
Authors: Guo Li Na , Wang Xiao Hong , Cui Zhan
Published: June 2014

The rising of the cloud computing and the generation of GIS cloud will promote the development mode of server and client into a new high tide, and with the popularity of intelligent mobile phones and plate computer, mobile will not only the development trend but also the trend of the development of IT, and then the development of intelligent mobile phone for the mobile GIS development will be the future GIS development of one of the main trend. So in our study, we considered how to explore the future wisdom campus mobile end GIS product, from this view, so we choose the system which is today's popular Windows Phone operating , and basing on the the wisdom campus, and design mobile Phone campus GIS system.Our research and development process choose the Microsoft Visual Studio 2010 as development platform, we using c # language for development, and choose ArcGIS Server10 as GIS service server, design and develope the Windows Phone mobile Phone about the mobile Phone campus GIS system. The whole system mainly consists of campus news module, course arrangement module, map query module, my diary module, recent weather modules, the system will convenience users’ campus life, which is also a very meaningful exploration and attempt for the intelligent campus.
Software Vulnerabilities Detection Based on Random Programming
Authors: Wu Bo , Li Meng Jun , Zhang Bin , Feng Chao , Zhang Quan , Tang Chao Jing
Published: June 2014

Despite many automatic vulnerability detection approaches have been well documented, existing solutions for discovering software vulnerabilities in binary software are still difficult and time consuming. In this paper we present an approach based on random programming that works to quickly discover vulnerability in programmable binary software. By extracting the code snippets for special features and fixed API usages, we can get a set of original functional templates, and then we randomize the mutable factors in those templates. After that we reasonably make combination of those templates to produce final test templates. Finally, by concretizing the random factors we execute those test templates and monitor the software be tested to discover vulnerabilities. By template programming we can produce more reasonable test case, which makes our approach more effective than other solutions.
Algorithms of Mining Maximum Frequent Itemsets Based on Compression Matrix
Authors: Shu Si Hui , Lin Zi Zhi
Published: June 2014

Association rule mining is one of the most important and well researched techniques of data mining, the key procedure of the association rule mining is to find frequent itemsets , the frequent itemsets are easily obtained by maximum frequent itemsets. so finding maximum frequent itemsets is one of the most important strategies of association data mining. Algorithms of mining maximum frequent itemsets based on compression matrix are introduced in this paper. It mainly obtains all maximum frequent itemsets by simply removing a set of rows and columns of transaction matrix, which is easily programmed recursive algorithm. The new algorithm optimizes the known association rule mining algorithms based on matrix given by some researchers in recent years, which greatly reduces the temporal complexity and spatial complexity, and highly promotes the efficiency of association rule mining.
Research and Implementation of Relational Database Encryption Technology Based on Main Memory Database
Authors: Xu Yong Kang , Wan Zheng Jing , Zhang Ji Lan , Wu Jia Ju
Published: June 2014

As the relational database is applied widely, how to protect the sensitive data and state secrets has become a problem which needs to be solved urgently. The conventional relational database encryption technology not only reduces the system’s performance, but also results that we can not quickly inquire the encryption data through the original index mechanism due to the loss of the original partial order relation among data. This paper proposes a kind of relational database encryption technology based on the main memory database. It has not only realized the transparent encryption, decryption and ciphertext storage of the relational database, but also still retained the original response and retrieval performance. This technical proposal has very strong adaptability as well as strong practice guidance meaning for protecting the internet business data and the war-industry informative state secrets.
Study on Fair Definitions and Application Modes of Big Data
Authors: Li Tian Zhu , Wang Sheng Hui , Ma Jia
Published: June 2014

Big data is becoming the focus of all circles, but disordered and ambiguous definition of big data will deeply affect the study of this field. On the basis of the literature review, this paper applies the method of concept replacement in analytic philosophy, and puts forward a strict, clarified and broadly-accepted definition of big data, based on the fair definition, the study of a series of subsequent problems becomes simple and easy. The paper further discusses the application perspective and modes of the definition of big data by cases study in management of enterprise technological innovation.
Combination of Data Masking and Data Encryption for Cloud Database
Authors: Kuacharoen Pramote
Published: June 2014

Database as a service in cloud computing enables the user to create, store, modify, and retrieve data over the Internet. The user does not have to install and maintain the database himself. Instead, the database service provider takes responsibility for installing and maintaining the database. Storing data in a cloud database introduces security risks in data confidentiality, data integrity, and privacy. This research aims to design a method for storing data in a cloud database that provides data confidentiality and privacy and allows querying data. The comparison operations and aggregate functions can be performed on the cloud server. The research employs a combination of data masking and data encryption to achieve the objectives.
A Secret Sharing Scheme on Access Structure
Authors: Qin Hua Wang , Zhu Xiao Hua , Dai Yue Wei
Published: June 2014

A secret sharing scheme on access structure is proposed basing on the Lagrange interpolation, in which any extra information for each qualified subset is not needed, and each participant only needs to keep one shadow. Besides, the proposed scheme can be used to share multi-secret. Compared to the existing schemes, the proposed scheme is more simple, and easy to be applied in practice.
Linear Random Model and its Application to Data Recovery
Authors: Lin Hai
Published: June 2014

Recently, systems with a large amount of data have received a lot of attention. But the reality is that information may not be complete, in other words, people may have missing data. In order to solve this problem, a lot of models have been proposed. In this paper, we propose a new approach, which is based on linear random model. We test our model using real-world data and show that this new approach is good for incomplete data recovery and can get us desirable results.
A Large-Scale and Flexible BMS Design
Authors: Zhang Cheng Jun , Zhang Li Chao , Shi Yu Sheng
Published: June 2014

Through comparing the battery management system (BMS) in existence, it concludes that every BMS has its own features, such as, interface, communication, data hand method, and so on. There is no uniform standard in the globe, so the BMS has the compatibility problems. In order to serve the problem, this paper proposed the large-scale and flexible BMS design, which can save the BMS design time and reduce the designer work strength. In this paper, the flexible hardware and software are designed, which can change the software and interface form a new BMS quickly to satisfy the market requirement. The large-scale and flexible BMS design method mentioned in this paper can accelerates the process of the BMS design, shortens the production development cycle, and satisfies the market requirement speedily.
B-Spline Surface Approximation to Scanned Data Using Least Square Approximation
Authors: Lin Zi Zhi , Shu Si Hui
Published: June 2014

Lofting is widely used to approximate the scanned data in row-wise fashion, but this method is prone to result an astonishing number of control points in the process of making the rows curve compatible. A novel algorithm of B-spline surface approximation to the scanned data is presented in this paper to solve this problem. Firstly, the scanned data are interpolated by rows of curves; then these curves are approximated by other curves using least square approximation. In this process, all curves are approximated by a common knot vector, and it is different form the traditional method that each curve is approximated by a different knot vector, so we needn’t insert many knots in each curve to make curves compatible. We also can meet high accuracy without losing the shape of lofting surface because we firstly interpolate the data, the best least square approximation substitute insertion of knots in lofting. Numerical example shows that the proposed method is efficient in reducing control points of the lofting surface.
Challenging the Recognition of Facial Expression via Deep Learning
Authors: Hu De Kun , Liu Yong Hong , Zhang Li , Duan Gui Duo
Published: June 2014

A deep Neural Network model was trained to classify the facial expression in unconstrained images, which comprises nine layers, including input layer, convolutional layer, pooling layer, fully connected layers and output layer. In order to optimize the model, rectified linear units for the nonlinear transformation, weights sharing for reducing the complexity, “mean” and “max” pooling for subsample, “dropout” for sparsity are applied in the forward processing. With large amounts of hard training faces, the model was trained via back propagation method with stochastic gradient descent. The results of shows the proposed model achieves excellent performance.
Enhanced MIL Visual Tracking via Distribution Fields Descriptor
Authors: Sun Kang , Sun Nian Nian
Published: June 2014

This paper presents an enhanced multiple instance learning (MIL) tracker with a suitable representation of object appearance called distribution field descriptor (DF). To address transformations of object template (rotation, scaling), we firstly replace the smoothed histograms used in DF with smoothed bins according the theory of averaged shifted histograms. Secondly, due to the DF specificity and landscape smoothness, we adopt DF descriptor instead of traditional Haar-like one to represent the object appearance. By build object model using selected discriminative layers, our tracker is more robust while needing fewer features than the original tracker. The experimental results show higher performances of our tracker than those of five state-of-the-art ones on several challenging video sequences.
An Identity-Based Conditional Proxy Re-Encryption in Cloud Computing Environments
Authors: Meng Xian Yong , Chen Zhong , Meng Xiang Yu , Sun Bing
Published: June 2014

In this paper, an identity-based conditional proxy re-encryption (PRE) scheme is proposed, where a delegator provides a re-encryption key satisfying one condition to a semi-trusted proxy who can convert a ciphertext encrypted under the delegator’s public key into one that can be decrypted using the delegatee’s private key. We address the identity-based proxy re-encryption scheme, where the delegator and the delegatee request keys from a trusted party known as a key generator center (KGC), who generates private keys for delegator and delegatee based on their identities. Meanwhile, the identity-based conditional proxy re-encryption scheme satisfies the properties of PRE including unidirectionality, non-interactivity and multi-hop. Additionally, the identity-based conditional proxy re-encryption scheme is efficient in terms of both the communication cost and the computing cost, and can realize security secret sharing in cloud computing environments.
Laser Active Image-Denoising Based on Principal Component Analysis with Local Pixel Grouping
Authors: Li Wei Li , Yin Xiao Qing , Wang Bin , Zhang Mao Jun , Tan Ke
Published: June 2014

Denoising is an important issue for laser active image. This paper attempted to process laser active image in the low-dimensional sub-space. We adopted the principal component analysis with local pixel grouping (LPG-PCA) denoising method proposed by Zhang [1], and compared it with the conventional denoising method for laser active image, such as wavelet filtering, wavelet soft threshold filtering and median filtering. Experimental results show that the image denoised by LPG-PCA has higher BIQI value than other images, most of the speckle noise can be reduced and the detail structure information is well preserved. The low-dimensional sub-space idea is a new direction for laser active image denoising.
Pedestrian Detection Optimization Algorithm Based on Low-Altitude UAV
Authors: Guo Yong De , Xie Zhi Gang , Ma Hong Bing
Published: June 2014

Pedestrian detection is one of the critical benchmarks for object detection in computer vision. In recent years, more effective detectors and features, such as Histograms of Oriented Gradients (HOG) have been proposed. The process of HOG features calculation is slow, and the features cannot satisfy represent the human body. Therefore, we adopt the multi-channel features, and propose a new improved method for accelerated integral image, the execution time of which is less than the original method. In addition, we apply novel multi-scales detection to detect new scenario, which is based on the low-altitude UAV. Under such scenario our algorithm can handle the changing in pedestrian posture and occlusion cues. The experimental results indicate that our algorithm is rapid and efficient under dynamic camera, comparing with other methods in INRIA dataset.
Research on QR Code Black Line and White Line Defect Detection Algorithm
Authors: Zhao Jian , Wang Huan Wei , Liu Shan , Zhang Na , Jia Jian
Published: June 2014

In order to solve the defect detection problems of black line and white line of QR Code. According to the linear properties of defect, this paper puts forward a kind of defect detection algorithm based on Hough Transform and vertical projection. Through the experiment testing, the accuracy of algorithm detection reached 98.57%, the average test time is 38.28ms. This algorithm can be transplanted to other types of QR code and industrial on-line detection system.
Study on Application of CAD Used in Visual Advertising Design
Authors: Liu Jun
Published: June 2014

The 3D technology currently has in various engineering fields have a wide range of applications, all the 3D visual effects technology can bring us visual impact, the use of 3D technology produced by the television advertising more easily accepted by the audience, this paper study on the 3D computer-aided design advertising design application technology.
The Research of Ortho-Rectification to QuickBird Image with more Mountains Based on ERDAS10.0
Authors: Li Cong , Wang Qiang , Wang Meng , Cui Jia Jie
Published: June 2014

In recent years, the application of high resolution remote sensing images has become more and more widely with the development of Remote Sensing technology. QuickBird satellite image is the more commercial used high resolution remote sensing image, but due to its technical confidentiality, high-resolution satellite generally does not provide rigorous sensor model. This paper uses ERDAS10.0 to orthographic check the QuickBird image by the method of orthorectification, introduces the method and procedure of the orthogonal projection like drawing, analysis the positioning accuracy.
Tomato Disease Image Retrieval Based on Composite Features
Authors: Zhang Qian , Yu Feng , Liu Xin , Zhang Jun Feng
Published: June 2014

A new method of tomato disease image retrieval was proposed, which based on the composite feature extraction of disease images. The feature was converted to a set of hash sequence. This retrieval method can reflect the image content in a better way for the comprehensive application of color, texture and shape features. The digital index of image through perception hash algorithm processing can retrieval images and return the result more rapidly.
Upper-Body Pose Recognition Using Cylinder Pattern Model
Authors: Park Jae Wan , Lee Seok Jin , Lee Chil Woo
Published: June 2014

In this paper, we propose cylindrical coordinate system which can analyze upper-body pose of the depth images correctly. This method extracts the part of human body from the depth images, and we configure the center of the part as origin of the cylindrical coordinate system. And we configure multi-layered cylinders based on the origin, then, we can analyze pose using the pattern which is crossed depth images namely cylinders and upper-body. Since the crossed point of the cylinders and upper-body is obtained as brightness values, it can extract to convert feature vector of the cylindrical coordinate system. The extracted feature vectors of the cylindrical coordinate system are presented to feature space of circular and are categorized pose patterns. The pose patterns are learned using average value of the feature vectors, and the pose patterns are categorized as pose to compare to pre-defined pose patterns using Euclidean distance. In this paper, we applied dynamic cylinder model to the region of the upper-body, so we can be classified as head, body and arms through simple computation, and to extract pose information is possible effectively. In this paper, the effect that can get through proposing pose estimation method is as following. At the first, pose estimation is possible by using only minimum feature points which apply cylinder model in region that connect human's torso, head and arms. The second is as following. When we obtain the feature points, because of applying cylinder model, we can extract user's feature points and angle of rotation easily. And in this paper, we don't consider the status of the user's body is titled using only the upper-body poses of the state rightly standing pose toward the front. Because it has disadvantage which cannot distinguish between changes according to the tile of the torso, but we can detect the vectors of the hands and arm using cylindrical coordinate system. Therefore, in the future, we will study to be able to recognize the pose in the tilted status.
Food Submergence Calculation and Analysis Using Digital Elevation Model and Geographical Information System
Authors: Zhang Xiao Qing , Wu Kun Hua
Published: June 2014

Floods usually cause large-scale loss of human life and wide spread damage to properties. Determining flood zone is the core of flood damage assessment and flood control decision. The aim of this paper is to delineate the flood inundation area and estimate economic losses arising from flood using the digital elevation model data and geographic information system techniques. Flood extent estimation showed that digital elevation model data is very precious to model inundation, however, in order to be spatially explicit flood model, high resolution DEM is necessary. Finally, Analyses for the submergence area calculation accuracy.
A Video Characteristics Watermarking Algorithm Based on Bees Evolutional Computation
Authors: Yang Cheng Zhong , Zheng Xiao Shi
Published: June 2014

Digital video watermarking is an efficient way of copyright protection. A robust watermarking was proposed that ccording to the video features using the evolutional method of video image classification processing, suitable for video performance and human visual characteristics of video watermarking, and put forward a kind of using Bees evolutional algorithm for video image classification processing of video watermarking algorithm. All the key frame numbers are converts to a binary matrix after data transformation. At last the binary image is produced. From this, the watermarking image reflects the video’s features, so it is effective to resist the watermark copy attack.
An RFID-Assisted Digital Souvenir Generation System
Authors: Duan Ding Bo , Hou Wei , Ma Jian
Published: June 2014

Nowadays, it has become an increasingly prevalent trend to preserve exciting experiences in the form of videos and photos when people go out for amusement. In this paper, we propose a novel system to produce a personalized digital souvenir for people when they take part in thrill rides like events. Specifically, we employ on-board devices including a digital camera with a built-in microphone and a WiFi-enabled compact computer to capture the exciting experience of riders. To search highlights of a rider, we devise a mapping scheme to link the id of a rider and that of the camera pointing the rider by utilizing the RFID (Radio Frequency Identifier) technology. The retrieved highlights are combined with pre-prepared templates to produce a final digital souvenir. Field trials are performed to evaluate the technical feasibility of the proposed system, which lead to remarkable results.
Dynamic Biomedical Image Segmentation Based on Wavelet Transform
Authors: Li Zhan Ping , Yang Mo Yuan , Wang Long
Published: June 2014

In this paper, the image segmentation algorithm based on wavelet transform is presented. The proposed image segmentation algorithm performs the segmentation in the combined intensity-texture-position feature space in order to produce connected regions that correspond to the real-life objects shown in the image. This segmentation algorithm is applied to reduced versions of the original images in order to speed-up the completion of the segmentation. As shown by experimental evaluation, this novel scheme provides fast segmentation with high perceptual segmentation quality.
Simulation of Dynamic Light Scattering Signal Based on AR Model
Authors: Zhang Yan Min , Qi Xing Guang , Li Qing Hua
Published: June 2014

According to the autocorrelation function (ACF) of the ultrafine particles, the auto-regressive (AR) model used for dynamic light scattering (DLS) signals simulation can be established. By the method, DLS signals for nanoparticles distribution are simulated respectively and every ACF of simulation signal performs a great agreement with its theory value. The simulation signals were respectively inversed and inversion errors are less than 5.25%. The particles size inversions of Photon Correlation Spectroscopy (PCS) are obtained by Morozov discrepancy principle. Experiments show that the method based on AR model is feasible in DLS signal simulation.
A Dual-DSP Sonobuoy Signal Processing System
Authors: Zheng Jian , Gao Tian De
Published: June 2014

Sonobuoy is used as aviation antisubmarine device to detect submarines, and its wireless communication mechanism would introduce radio interference. The speech signal needs to be identified from the submarine noise in order to facilitate sonar signal processing system to do further processing of the signal. This paper presents a TS-201 based dual-DSP sonobuoy signal processing system, and proposes an algorithm using Cubic Spline Interpolation and Pearson correlation coefficient to identify the speech signal from submarine radiated noise signal. This article describes the specific signal processing algorithm of the system, the hardware and software design of the system. This article uses a large number of data from experiments to test the hardware and software systems separately. The results of tests are analyzed, which indicate that the system function well in identifying speech signal from submarine radiated noise signal to, with a percentage of 98% correct rate.
A 3 GHz Semi-Digital Delay Locked Loop with High Resolution
Authors: Ding Yi , Duan Xi , Liu Jun
Published: June 2014

A high speed and high resolution semi-digital DLL (Delay Locked Loop) circuit will be discussed. The circuit is composed of three blocks: delay line, phase detector and digital finite-state machine (FSM). The delay line consists of two steps: the coarse tuning by tapping and the fine delay using interpolation to enable a resolution as high as 2 picoseconds. With the two steps approach and configuration of delay line, 3 GHz speed and picoseconds-level resolution can be achieved.
A Flyback 25W Switching Power Supply for Electric Vehicle
Authors: Shao Zhu Lei
Published: June 2014

In order to keep the stability of the control circuit of electric vehicle, a flyback switching power supply was designed in this paper. The flyback switching power supply adopting current control mode PWM chip UC3842, and the output power of flyback switching power supply is 25W. In the design process of flyback switching power supply, the component parameters of control loop are worked out thoroughly. The flyback transformer was designed by considering the maximum pressure value of power switch. From the experimental results, the flyback switching power supply can work stably in the full load condition. The flyback switching power supply has excellent stability and dynamic characteristics.
A Low Standby Power Consumption Control Circuit for Switching Power Supply
Authors: Shao Zhu Lei
Published: June 2014

Aiming at reducing standby power consumption of switching power supply, a low standby power consumption control circuit for switching power supply is designed. The control circuit is composed of power switches, the driving circuit, the load detection circuit and the low power supply circuit. The control circuit effectively closed the input of switching power supply when the switching power supply is without load. The control circuit ensures the normal work of switching power supply when the switching power supply is with load. From the experiment results, the control circuit can effectively reduce standby power consumption of switching power supply.
Current Zero Crossing Detection Circuit for Synchronous Rectification Model Buck Converter
Authors: Shao Zhu Lei
Published: June 2014

In order to reduce the power consumption of the synchronous rectification model buck converter, a current zero crossing detection circuit is designed in this paper. The detection circuit determines the freewheeling current of the synchronous rectification power switch is zero or not by detecting the drain voltage of synchronous rectification power switch. Due to use transistors instead of resistors in the voltage conversion, the accuracy of the detection circuit is less affected by temperature and process corner. From the experimental results, the detection circuit can make accurate current zero crossing detection in different temperatures and process corners, and the detection circuit has strong robustness.
Dispersion Characteristic of the Symmetric Slab Waveguide with Chiral Negative Refractive Medium
Authors: Xu Xiao Xue , Xiao Zhong Yin , Ma Quan Wen , Ma Xiao Long , Liu De Jun , Wang Zi Hua
Published: June 2014

According to Maxwell equations and constitutive relations in chiral medium, the dispersion characteristic of the symmetric slab waveguide with chiral negative refractive medium is studied. The dispersion equations expressed in the normalized parameter are deduced in the slab waveguide. The numerical results show that the chiral parameter has great influence on the dispersion characteristic of slab waveguide. When the relative chiral parameter is about 0.0477, the zero order mode of left-handed polarized wave disappears. While it is greater than 1, the core becomes chiral negative refractive medium and the zero order mode disappears. In addition, compared with the general chiral waveguide, the tendency of dispersion curves in slab waveguide with chiral negative refractive medium is also analyzed.
Dispersion Curves and Fields for a Chiral Negative Refraction Parallel-Plate Waveguide under PMC Boundary
Authors: Ma Quan Wen , Xiao Zhong Yin , Xu Xiao Xue , Ma Xiao Long , Liu De Jun , Wang Zi Hua
Published: June 2014

The characteristics of a chiral negative refraction parallel-plate waveguide under PMC boundary are studied theoretically, and the corresponding dispersion relations, cut-off frequencies, propagating guided modes are obtained. Some novel features are found, such as fundamental mode will be not exist only if the chirality parameter κ>1, in addition, the cutoff frequency is no longer the conventionally defined frequency when propagation constant is zero, but the least frequency that guided mode can still propagate. According to the relations between propagation constant β and wavenumbers k+,k-, the dispersion curves are divided into three regions , and the electromagnetic field components in the regions are analyzed in detail.
Key Technology of LCA on Small Wind Power Generation System
Authors: Mo Qiu Yun , Li Shuai Shuai , Deng Fei , Tang Liang Bao , Zhang Ke Yan
Published: June 2014

Many domestic and international scholars carried on LCA method research to wind power generation system, but generally focused on the large megawatt wind power generation system rather than SWPGS Small Wind Power Generation Systems (power rating less than 1kw).The different structural between large wind turbine and small wind turbine led to the different system boundaries and evaluation models in LCA. So this paper puts forward to establish LCA database based on Geographical Information System (GIS) and establish evaluation model based on Agent-based Modeling (ABM) method, which can provide references for LCA direction of the further deeper follow-up research.
Research on the PCHD Control Strategy for Three-Phase Voltage Source PWM Rectifier under Unbalanced Supply Voltage Condition
Authors: Zhao Feng Jiao , Wang Jiu He , Zhang Bai Le
Published: June 2014

In order to improve the performance of the rectifier under unbalanced voltage condition, this paper adopts port-controlled Hamiltonian dissipation (PCHD) control strategy. On the basic of the mathematical model of the three-phase voltage source PWM rectifier, its PCHD model in synchronous dq coordinates was established by orthogonal transformation. The desired equilibrium point of the system was obtained according to the target of the design. The controller was designed with the method of interconnection and damping assignment, and the PI control method was introduced to restrain the steady-state error of DC side. Simulation results show that the designed control system has perfect static and dynamic performances and robustness.
Stabilization of a Class of Chaotic Systems via Single-State Adaptive Feedback Controller
Authors: Yang De Gang , Qiu Guo Ying
Published: June 2014

This paper investigates the application of the adaptive feedback control method in the chaotic system and Single-state Adaptive Feedback Controller. We divide the adaptive feedback controller into several items, each of which has only one component of the system states as feedback input into each dimension of the system. With the introduction of single-state controller, the scale of control inputs can be flexibly adjusted, the additional loading reduced, better convergence effect obtained and the application field of adaptive feedback control methods further extended in stable control analysis of chaotic systems. An example is also given to illustrate the validity of our result.
Studies on the Ontology-Based Composable Modeling Technology of Radar Countermeasure Test Simulation
Authors: Li Zhi , Zou Hong Xia , Gao Yong Ming
Published: June 2014

Aiming to realistic requirement to reusability and composability of radar countermeasure test simulation and modeling, the ontology construction method has been proposed by analyzing the influence of ontology in terms of knowledge management and formal description. The design of ontology-based component library and the solutions of composable modeling have been discussed, and the effectiveness has been validated by examples that the methods can satisfy the requirements of model reusability and simulation compos-ability in the field of radar countermeasure test simulation and modeling.
Microstructure/Mechanical Property Correlations in a Medium Carbon Steel
Authors: Chama C.C.
Published: June 2014

The tensile and fracture strength of a medium carbon steel containing 0.2wt%C were determined after austenitisation at 1100oC for 1 h and subsequent isothermal transformation at 700oC for 0.5, 2, 6 and 8 h. Only the specimens transformed for 0.5 and 2 h contained martensite and these were l5.67 and 7.20%, respectively. The maximum measured tensile and fracture strength were 91l and 852 MPa, respectively and these were obtained in the specimens with the most martensite (0.5 h). Although after austenitisation and subsequent isothermal transformation there was a loss in ductility, this was accompanied by a very significant improvement in tensile and fracture strength.
Acute Administration of Chitosan Nanoparticles Increases Ca2+ Leak in Rat Cardiomyocytes
Authors: Narasimhan Gayathri , de Alba-Aguayo David Ramiro , Mondragón-Flores Ricardo , González-Pozos Sirenia , Miranda-Saturnino Miyamin J. , Sridharan M. , Rueda Angélica
Published: June 2014

Polymeric nanoparticles like chitosan nanoparticles may be used to deliver drugs to particular organs, such as heart. However, due to the lack of information about acute effects of chitosan nanoparticles in cardiac calcium handling, we evaluated the same in intact rat left ventricular myocytes. Chitosan nanoparticles were synthesized by ionic gelation method for three different concentrations of chitosan and tripolyphosphate (TPP) such as 1:1, 2:1 and 3:1, respectively. The size of the particles was below 100 nm for the 2:1 and 3:1 chitosan:TPP ratio and 300 nm for 1:1 ratio. The particles synthesized in 3:1 ratio were incubated for 0, 15, 30 and 60 minutes with Fluo-3 loaded cardiomyocytes, their effects were evaluated in local Ca2+ release events using confocal microscopy and compared with control cells. Chitosan nanoparticles increased the amplitude and size of Ca2+ spark by 14.1% and 24.1% at 30 minutes of incubation; while the increment was 24.7% and 28.4% at 60 minutes respectively. Accordingly, rising time of Ca2+ sparks was decreased by 47% at 30 minutes. These changes were reflected in increased local Ca2+ flux by 58.3% and spark-mediated Ca2+ leak by 145.9% and 146.5% at 30, and 60 minutes, respectively. Hence, these results indicate that chitosan nanoparticles modify the properties of local Ca2+ release events mainly at short incubation times and must be taken into account while using these nanoparticles in drug delivery.
Circumferential Decompression with Posterior Instrumentation and Fusion by Lateral Extracavitary Approach – Effective Solution Aiding the Treatment of Infectious Spondylodiscitis
Authors: Popa Iulian , Negoescu Dan , Poenaru Dan , Oprea Manuel
Published: June 2014

The goal of this study is to assess the efficacy of one-stage surgical management for infectious spondylodiscitis by circumferential decompression with posterior instrumentation and fusion by lateral extracavitary approach. Between March 2010 and June 2012, 7 cases with bacterial spondylodiscitis were treated with one-stage circumferential decompression with posterior instrumentation and fusion. All cases were followed-up for an average of 11.3 months (range 6-18 months). The average preoperative kyphosis was 13° (range 9-29°), and the average postoperative kyphosis was 8° (range 3-18°). At final follow-up, minimal progression of kyphosis was seen, with an average kyphosis of 12° (range 4-22°). An average loss of correction of 4° was seen at final follow-up. One-stage surgical management for spondylodiscitis by circumferential decompression with posterior instrumentation and fusion was feasible and effective.
Bioactivity Assessment of Niobate Apatite
Authors: Navarro da Rocha Daniel , de Oliveira Cruz Leila Rosa , de Andrade Gobbo Luciano , Prado da Silva Marcelo Henrique
Published: June 2014

Hydroxyapatite is a bioceramic material of great interest for use as bone substitute because of its similarity with the composition of biological apatite. Cationic and anionic substitutions in the apatite structure have been made in order to optimize the synthesis and accelerate the process of bone repair. In the present study, niobate apatite was synthesized by a patented aqueous precipitation method. The bioactivity of the samples was assessed by X-ray diffraction analyses (XRD), energy dispersive X-ray spectroscopy (EDS) and scanning electron microscopy with field emission gun (FEG-SEM; FEI Quanta FEG 250) in the samples before and after an incubation period in simulated body fluid. The results showed that after 3 days a bone-like apatite coating was formed onto the niobate apatite surface. A peculiar morphology comprised by nanosized wires was also observed on the niobate apatite surface.
Structural and Surface Characterization of some Ceramic Coatings Obtained by Plasma Jet Spraying on Metallic Biomaterials Substrates
Authors: Razvan Ionescu , Eugeniu Vasile , Munteanu Corneliu , Istrate Bogdan , Niculescu Marius
Published: June 2014

Because surgical techniques are growing in volume and complexity, the reduction of operational costs based on multi-use surgical instruments has become an important factor and the possibility to improve their durability appear to be very important. Identified solutions to improve surface properties of the surgical instruments made ​​by metallic materials consist of deposition of protective coatings. A lot of methods for coatings and different coating materials like thin layers (TiN, ZrC, TiC, DLC) or ceramics (hydroxiapatite, zirconia) was tested until now by different group. In this experimental study, we perform different coatings on a substrate made by stainless steel type 316L and titanium alloy type Ti6Al4V using hard ceramic biomaterials as coating materials (TiO2 and YSZ - yttria stabilized zirconia) deposited by the method of plasma jet deposition. The obtained coatings was analyzed using scanning electron microscopy coupled with EDS in order to characterize the morphology and composition of the coatings. Also, the XRD analysis was performed. As a general conclusion we can say that TiO2 layers deposited using plasma jet deposition presents the best parameter from the point of view of structure and morphology. Anyway, more studies related to the functional properties of these coatings must be made before to be recognized as a solution to improve the performance of the surgical instruments.
Bioactivity of a Poly(70lactic-co-30glycolic acid)/15CaO-85SiO2 Composite with a Dual Pore Structure
Authors: Shin Hye Young , Shin Sang Hee , Rhee Sang Hoon
Published: June 2014

The low crystalline hydroxyl carbonate apatite forming capacity of a poly (70lactic-co-30glycolic acid)/15CaO-85SiO2 composite, which had a dual pore structure, was newly examined in simulated body fluid. The bioactive 15CaO-85SiO2 particles were synthesized by a sol-gel method using tetraethyl orthosilicate (TEOS) and calcium nitrate tetrahydrate under acidic condition followed by the heat treatment at 600°C for 3h. The poly (70lactic-co-30glycolic acid)/15CaO-85SiO2 composite was then prepared by a solvent casting using dimethylformide as a solvent. The composite was loaded into a high pressure chamber and then carbon dioxide gas was introduced achieving a final pressure of 20 MPa. After 3 days, carbon dioxide gas was released quickly and resultantly the dual pore structure was obtained. The samples were observed by FE-SEM and its bioactivity was tested in simulated body fluid.
Effect of Lithium Disilicate Ceramic Thickness on the Color of Discromic Substate
Authors: Botos Alexandra , Gasparik Cristina , Colosi Horatiu , Badea Mandra , Dudea Diana
Published: June 2014

The aim of this study was to evaluate the influence of the thickness of lithium disilicate ceramics (medium opacity) on the color perception of pressed full-ceramic restorations, in various situations of discromic substrate. The color parameters of ceramic disks (10 mm diameter, thickness 0.3, 0.6, 0.9, 1.2, 1.5mm), (n=5), of IPS e.max® Press MO 0 (Ivoclar Vivadent) were evaluated upon samples of light cured composite material that simulate the shade of prepared teeth (IPS Natural Die Material Kit, Ivoclar Vivadent) (disks 10mm diameter, 5mm thickness). Saturated sucrose solution was interposed between the ceramic disks and the composite disks. The color parameters CIE L*, a*, b* were recorded by using a spectrophotometer (VITA Easyshade® Advance, VITA Bad Säckingen, Germany). The color difference E was calculated. Statistical analysis of the data revealed that the increase in thickness of the ceramic layer will lead to an increased masking of the discolored background by the ceramic layer.
Daily Variations in the Glycerol-3-Phosphate Dehydrogenase Isoforms Expression in Triatoma infestans Flight Muscles
Authors: Stroppa María M. , Carriazo Carlota S. , Gerez de Burgos Nelia M. , Garcia Beatríz A.
Published: June 2014

Triatoma infestans, the main vector of Chagas disease, is a blood-sucking insect. Flight dispersal of adults is the most important mechanism for reinfestation of houses after insecticide spraying. Flight muscles have two glycerol-3-phosphate dehydrogenase (GPDH) isoforms: GPDH-1 is involved in flight metabolism and GPDH-2 provides lipid precursors. In this study, we explored the profile of GPDH expression in females and males adult flight muscles under light/dark cycle, constant light, and constant dark conditions. Under constant dark conditions, GPDH-1 flight muscles of T. infestans showed a rhythmic pattern of transcription synchronous with a rhythmic profile of activity suggesting regulation by the endogenous circadian clock. Otherwise, the GPDH-2 expression analysis showed no regulation by the endogenous clock, but showed that an external factor, such as the dark/light period, was necessary for synchronization of GPDH-2 transcription and activity.
Management of a Chest-Wall Soft-Tissue Tumor Caused by an Infection with the Larval Tapeworm Pathogen Taenia crassiceps
Authors: Roesel Christian , Welter Stefan , Stamatis Georgios , Theegarten Dirk , Tappe Dennis
Published: June 2014

A chest-wall lesion of an immunocompetent patient was initially suspicious for a malignant tumor. Histopathological and polymerase chain reaction examinations revealed an infection with the larval stage of the tapeworm Taenia crassiceps. Curative resection of the tumorous lesion was performed. Treatment options for immunocompromised patients and patients without known immune defect are discussed, because most of the infections occur in immunocompromised individuals.
Timing of Adoption of Clean Technologies, Transboundary Pollution and International Trade
Authors: Ben Jebli Mehdi , Ben Youssef Slim
Published: June 2014

The authors consider a symmetric model composed of two countries and a firm in each country. Firms produce the same good by means of a polluting technology which uses fossil energy. However, these firms can adopt clean technology which uses renewable energy, having lower costs. Interestingly, opening markets to international competition increases the per-unit emission-tax and decreases the per-unit production subsidy. The socially optimal adoption date under a common market better internalizes transboundary pollution than that under autarky. In autarky (resp. a common market), firms adopt the clean technology earlier (resp. later) than what is socially optimal and, therefore, regulators induce clean technology adoption at the socially optimal adoption date by firms postponing (resp. speeding up) adoption subsidies. Opening markets to international trade speeds up socially optimal adoption dates and reduces global flow of pollution.