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Search Results: 1 - 10 of 579 matches for " ZhiKun Gai "
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The origin of the vertebrate jaw: Intersection between developmental biology-based model and fossil evidence
ZhiKun Gai,Min Zhu
Chinese Science Bulletin , 2012, DOI: 10.1007/s11434-012-5372-z
Abstract: The origin of the vertebrate jaw has been reviewed based on the molecular, developmental and paleontological evidences. Advances in developmental genetics have accumulated to propose the heterotopy theory of jaw evolution, i.e. the jaw evolved as a novelty through a heterotopic shift of mesenchyme-epithelial interaction. According to this theory, the disassociation of the nasohypophyseal complex is a fundamental prerequisite for the origin of the jaw, since the median position of the nasohypophyseal placode in cyclostome head development precludes the forward growth of the neural-crest-derived craniofacial ectomesenchyme. The potential impacts of this disassociation on the origin of the diplorhiny are also discussed from the molecular perspectives. Thus far, our study on the cranial anatomy of galeaspids, a 435-370-million-year-old ‘ostracoderm’ group from China and northern Vietnam, has provided the earliest fossil evidence for the disassociation of nasohypophyseal complex in vertebrate phylogeny. Using Synchrotron Radiation X-ray Tomography, we further show some derivative structures of the trabeculae (e.g. orbitonasal lamina, ethmoid plate) in jawless galeaspids, which provide new insights into the reorganization of the vertebrate head before the evolutionary origin of the jaw. These anatomical observations based on new techniques highlight the possibility that galeaspids are, in many respects, a better proxy than osteostracans for reconstructing the pre-gnathostome condition of the rostral part of the braincase. The cranial anatomy of galeaspids reveals a number of derived characters uniquely shared with gnathostomes. This raises the potential possibility that galeaspids might be the closest jawless relatives of jawed vertebrates. Our study provides an intriguing example of intersection between developmental biology-based model and fossil evidence.
Self-Construal and Its Implications for Marketing  [PDF]
Kun Gai
Open Journal of Social Sciences (JSS) , 2018, DOI: 10.4236/jss.2018.65020
Self-construal is the concept of the individual’s understanding of the relationship between the self and others. Different self-construals have different effects on the individual’s behavior. This article compares the differences in individual consumption behaviors of individuals with different self construals, and analyzes the cognitive factors that produce such differences. Finally, it provides the application methods of self-construal in marketing practice.
Design of the License Plate Recognition Platform Based on the DSP Embedded System
Zhikun Zhang,Qilan Huang
Modern Applied Science , 2009, DOI: 10.5539/mas.v3n9p78
Abstract: The license plate recognition system (LPRS) is a very important development direction of the intelligent transportation systems (ITS). With the development of the society and the enhancement of human living level, the amount of vehicle increases continually and the traffic status is deteriorating gradually, which brings large pressures for the society and the environment. The increasingly crowded city traffic needs more advanced and effective traffic management and control. It has been an important research direction to utilize the license plate recognition technology to enhance the management level and the traffic efficiency, and implement safe intelligent transportation management. In this article, the design, implementation and optimization of the DSP license plate recognition system which takes the TMS320C6201 of TI Corporation as the core chip were introduced. In this system, the video frequency (VF) decoding chip first translates the analog TV image signals obtained from CCD into the digital image signals which are inputted into DSP through FIFO buffer by the control of CPLD, and then aiming at the image, DSP performs the license plate positioning, the license plate character segmentation, the license plate character identification, the optical aberrance emendation, the nonlinear emendation of speed error and other algorithm operations to obtain the result of the license plate identification.
Influence Control for Dynamic Reconfiguration of Data Flow Systems
Wei Li,Zhikun Zhao
Journal of Software , 2007, DOI: 10.4304/jsw.2.6.1-13
Abstract: Influence control is a very challenging issue in dynamic reconfiguration and still not well addressed in the literature. This paper argues that dynamic reconfiguration influences system execution in four ways: functional update, functional side-effect, logical influence on performance and physical influence on performance. Methods including version control, transaction tracing, switching reconfiguration plan, and reconfiguration scheduling have been proposed for controlling the influence. These methods are integrated into the Reconfigurable Data Flow (RDF) model, which is designed to support the dynamic reconfiguration of stateless data flow systems. The RDF platform is an implementation of the RDF model on Java platform. The RDF platform is implemented as an open frame for different reconfiguration planning algorithms and scheduling policies to be simulated and their influence to be quantitatively compared on a single platform. Using the Data Encryption and Digital Signature System as a case study, tests have been done on the RDF platform to examine the influence of different reconfiguration planning algorithms and scheduling policies. Experimental results show that the methods proposed in this paper is effective in controlling the influence of dynamic reconfigurations.
Specifying Dynamic Software Architectures with Dynamic Description Logic
Zhikun Zhao,Wei Li
Journal of Software , 2012, DOI: 10.4304/jsw.7.1.169-175
Abstract: Dynamic software architectures provide support for building long running and reconfigurable applications. Formal specification is useful to the design of correct and robust dynamic software architectures. In this paper, dynamic software architectures are specified with dynamic description logic. Dynamic description logic inherits the expressiveness and decidability of description logic and it has the ability to represent state changes. Reconfigurable dataflow model, which is an extension of the widely used dataflow model, is used as the architecture meta-model. Architectures, reconfiguration operations, and reconfiguration plans are represented in a unified framework from the view point of data flow. Three levels of constraints have been proposed to aid designers in predetermining the possible side effects of reconfiguration plans. The work can guide the development of dynamic software systems from component definition to reconfiguration plan design.
Application of Artificial Immune System in Structural Health Monitoring
Jiachen Zhang,Zhikun Hou
Journal of Structures , 2014, DOI: 10.1155/2014/709127
Abstract: A large number of methods have been proposed in the area of structural health monitoring (SHM). However, many of them rely on the prior knowledge of structural-parameter-values or the assumption that the structural-parameter-values do not change without damage. This dependence on specific parameter values limits these methods’ applicability. This paper proposes an artificial immune system- (AIS-) based approach for the civil structural health monitoring, which does not require specific parameter values to work. A linear three-floor structure model and a number of single-damage scenarios were used to evaluate the proposed method’s performance. The high success rate showed this approach’s great potential for the SHM tasks. This approach has merits of less dependence on the structural-parameter-values and low demand on the training conditions. 1. Introduction Structural health monitoring (SHM) refers to the process of implementing a strategy to identify the damage in engineering infrastructures. The damage here can be changes to the material and/or geometric properties, boundary conditions, and system connectivity [1]. The specific objectives of SHM systems are to acquire the information about the damage existence, the damage location, the damage type, and the damage severity [2]. An effective SHM system could detect the structural damage in its early stage, well before a catastrophic structural failure, which threatens the safety of people’s life and property. Also, SHM systems provide valuable information for postevent damage assessments and help to develop a condition-based repair priority. Various schemes have been developed to extract the structural health information from the measured structural dynamic response. These techniques include, but are not limited to, modal-based system identification techniques, wavelet-based approaches, neural network-based schemes, Kalman filter methods, statistical approach, and computer-based machine learning techniques [3]. As one of the machine learning techniques, the recently developed artificial immune system (AIS) is an interdisciplinary area, which relates to immunology, computer science, and engineering [4]. The AIS learns from the principles and mechanisms in the biological immune system (BIS) and takes advantage of the tremendous computation power of modern computers. Many algorithms of the AIS have been developed, such as the negative selection algorithm [5], the positive selection algorithm [6], and the clonal selection algorithm [7]. These methods have been successfully applied to many engineering areas
Adaptive Fuzzy Sliding Controller with Dynamic Compensation for Multi-Axis Machining  [PDF]
Hu LIN, Rongli GAI
Journal of Software Engineering and Applications (JSEA) , 2009, DOI: 10.4236/jsea.2009.24037
Abstract: The precision of multi-axis machining is deeply influenced by the tracking error of multi-axis control system. Since the multi-axis machine tools have nonlinear and time-varying behaviors, it is difficult to establish an accurate dynamic model for multi-axis control system design. In this paper, a novel adaptive fuzzy sliding model controller with dynamic compensation is proposed to reduce tracking error and to improve precision of multi-axis machining. The major ad-vantage of this approach is to achieve a high following speed without overshooting while maintaining a continuous CNC machine tool process. The adaptive fuzzy tuning rules are derived from a Lyapunov function to guarantee stability of the control system. The experimental results on GJ-110 show that the proposed control scheme effectively minimizes tracking errors of the CNC system with control performance surpassing that of a traditional PID controller.
Catalytic Functions of Metal Nanoparticles on Polymerization of Acetylene
Zhikun ZHANG,Zuolin CUI,

材料科学技术学报 , 1998,
Abstract: New spiral nano-fibers were synthesized by a polymerization process of acetylene with metal nanoparticles as catalysts which were prepared by a hydrogen arc plasma method. The microstructures, conductive property of the nano-fibers and the effects of different nanoparticles(catalysts) on the microstructures of the fibers were studied.

HU Zhikun,WU Chuansong,

金属学报 , 2008,
Abstract: High-speed metal-active gas (MAG) arc welding experiments were conducted to determine the critical welding speeds at which humping defects occur, the spacing between two adjacent humps along the welding direction, and the cross-section morphologies of the hump and the valley in a humping bead. Based on the weld pool images sensed during high-speed MAG welding process, the forming mechanism of humping bead is analyzed and verified through up-hill and down-hill welding experiments. Meanwhile, the effect of the compositions of shielding gas on the weld bead formation in high--speed MAG welding is also analyzed.
The Sleep of the Sultan. Rewriting of the Mille et une nuits in eighteenth-century contes exotiques Il sonno del sultano. Riscrittura delle Mille et une nuits nei contes exotiques settecenteschi
Bianca Gai
Between , 2011,
Abstract: This paper analyses the influence of Galland's Les Mille et une nuits on two Eighteenth Century French tales: Crébillon's Le Sopha and Diderot's L'Oiseau blanc, conte bleu. The focus is the use of Galland's narrative structure by French conte philosophique. Particularly, Crébillon's and Diderot's tales inherit from Galland's work the topic of the "asleep sultan". If in Les Mille et une nuits the narrative voice has the function to keep the listener awake, Crébillon and Diderot overturn the link between speaker and listener, as their narrative voices induce on the contrary sleep on the listener. This overturning is considered here as a consequence of these writers' theory of literature and philosophy. Il contributo analizza l'influenza della raccolta Les Mille et une nuits di Galland su due racconti francesi del XVIII secolo: Le Sopha di Crébillon e L'oiseau blanc conte bleu di Diderot. Oggetto di indagine è l'uso della struttura narrativa di Galland nel "conte philosophique" francese. In particolare, i racconti di Crébillon e Diderot ereditano dall'opera di Galland il tema del "sultano addormentato". Se nelle Mille et une nuits la voce narrativa ha la funzione di tenere sveglio l'ascoltatore, Crébillon e Diderot rovesciano la relazione tra parlante e ascoltatore, in quanto loro voci narranti inducono al contrario il sonno dell'ascoltatore. Tale rovesciamento è considerato qui una conseguenza della teoria della letteratura e della concezione filosofica dei due scrittori.
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