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Focused on the issue that making satellite CAD models is time-consuming, which is caused by its complex structure and various components, the assembly modeling technology for satellite virtual assembly is studied. The satellite components are stored in a tree structure. Each node in the tree represents a satellite component. The assembly relationship between components is represented by the parent-child...
The design of satellite orbit usually requires several space scientists that are responsible for different aspects of satellite orbit, such as orbital elements, satellite attitude. In order to make the result of design more intuitive and understandable to every involved space scientist and improve the efficiency of satellite orbit design, a real-time collaborative satellite orbit design system is...
Taking attendance has been widely used as a method to track students' academic behaviours. But conventional approaches are usually time consuming and inaccurate. In this paper, we have proposed an automated attendance tracking system, where students can use smartphones to submit attendance in parallel. Identity of a student is collaboratively verified by voiceprint and realtime location. Service isolation...
Smart home is now becoming prevalent with the development of the Internet of things (IOT) techniques. It is aimed at providing the user with a user-friendly method to control the home appliances such as doors, lights, even in a condition of long-distance. This controlling is generally achieved by a mobile phone which can access to the Internet. However, this can easily be breached if no security measures...
With the development of web technology, a sharp increment in the number of services brings in efficiency problem to service selection. Furthermore, in dynamic service selection, services have to be selected as soon as requests arrive. When requests to a service are frequent, the service is prone to failure. This paper proposes a skyline-based web service selection method to deal with efficiency problem...
A visual design platform enables geographically dispersed users to cooperate with each other. This paper proposes a real-time collaborative framework for 3D design based on HTML5. By using this framework to build collaborative web applications, users can work collaboratively to assemble 3D components, expand the component library, and manage users and data. Moreover, the framework can also synchronize...
With the development of web technology, collaborative applications provide a platform for geographically dispersed users to data analysis in numerous domains. However, the data delay hinders the collaborative teamwork under the circumstance of unstable network environment. In order to reduce the latency of collaborative web visualization, this paper proposes a solution for visualization of trend data...
In many industrial cooperative design systems, experts from different sub-systems propose one sub-solution or more. One sub-solution of a sub-system may be dependent on sub-solutions from other sub-systems. We need to describe dependencies between sub-solutions, choose one sub-solution from each sub-system respectively, and then combine them into an integrated solution of the system. Normally, we...
The design of industrial 3D product models involves multiple fields, spans numerous disciplines, and needs plenty of designers to participate in. In order to break the limit of designers' geographical separation and improve the efficiency of 3D design, a web system aiming at concurrently designing 3D models for distributed designers in different domains was developed. By introducing data replication...
In order to solve the dynamic substitution problem of service components in dynamic service environment, the paper proposed a solution, which contains a model called logic-interface orchestration, and a method for service composition based on logic-interface orchestration that realizes the model. The model involves the logic-interfaces that will be bound with service components to compose the service...
In the process of collaborative design, a large number of versions are produced. Storing and accessing versions is very frequent, so version storage in the process of collaborative design has become the core issue of version management. In recent years, how to reduce the storage space and improve the retrieval efficiency has become a research hotspot, however the research of version security is still...
Space science mission concurrent design is to meet the scientific mission requirements, optimize the spacecraft design and ultimately reaches a feasible solution for the proposed program. The information management system for space science mission concurrent design is developed to manage all design disciplinary data and support data exchange between the coupled disciplines. The space science mission...
In this paper, we propose a real-time driver gaze direction detection system using a 3D triangle model and neural networks to monitor the driver's distraction. This method uses two cameras and open CV (Open Source Computer Vision Library) to locate the face, eyes and mouth position. The location of the eyes and mouth are automatically taken by two cameras. Then the information of their locations is...
For wireless sensor network (WSN), in order to solve the problem which the ETBG have too many cluster heads and these cluster heads distribute too concentrated, a hierarchical clustering algorithm based on energy and distance balancing is proposed. The algorithm chose the cluster heads in the same gradient grade. It is proved by theoretical analysis and computer simulation that this method can make...
This paper analyzes the biometric identification and tracking related technologies of human-computer interaction. Based on Adaboost face detection algorithm, we propose a position-based head motion detection algorithm, which does not depend on the specific biometric identification and tracking. It uses feature classification method to detect mouth's opening and closing actions. We also design a software...
The research on internally-formed pillar-shaped temperature field must be do, in order to solve the structure design and work mode design problems of the hot metal temperature sensor for the blast furnace. But the massive manpower and material resources would be consumed if the experimental method is utilized purely. Heat-conducting analysis model is established on pillar-shaped cavity by applying...
In order to solve the problem of temperature measurement applied to hot metal of the blast furnace under smoggy and dusty environment, an optical and electronic integration sensor which is passable ray and airtight cavity by sheet iron was devised. Based on the sensor, a portable thermometer was designed and made. The detection for temperature of hot metal with the technology has characteristics of...
In this paper, a SiGe BiCMOS power amplifier has been designed, showing the competitive performance compared to GaAs HBT. The 2.4 GHz power amplifier realized in IBM 0.35 mum SiGe BiCMOS technology. As shown in Fig.5, under high power mode, the measured gain is 24 dB and the input return loss Sn is better than -15 dB, the output return loss S22 is ~9.6 dB at 2.45 GHz. The PA exhibits PidB of 24.1...
This paper describes the design of a polyphase filter in GSM receiver with low-IF topologies, using the circuit scheme of active-RC with the performance of single chip integrated. Based on TSMC 0.18 ??m CMOS process, the Spectre simulation results indicate that the filter is centered at 110 kHz with 200 kHz of bandwidth. It has a voltage gain of about 30 dB, an image rejection ratio of about 38 dB...
A two-stage class-A medium power amplifier operated at 1.95 GHz is designed and fabricated in Jazz SiGe BiCMOS 0.35-mum technology. The circuit is fully integrated excluding the bias inductances and the output matching network. The simulated results indicate that the power amplifier can deliver a power of more than 141 mW (21.5 dBm) with a PAE of 24% under 3.3 V supply voltage. The IMD2 and IMD3 are...
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