某型平台罗经训练模拟器的设计

针对某型平台罗经模拟器的问题,给出了模拟器硬件和软件的设计方案。通过RS-232串口,实现了单片机与上位机的通信,通过数码管驱动芯片CH452L和8255A实现了数码管、指示灯的显示和按键的采集。采用面向对象设计思想进行软件设计,以VB6.0和SQL2000为软件设计平台,通过数据库控制程序的流程,对操作台状态和操作进行实时监控,并提供实时的操作提示和帮助,使模拟器操作响应与实际装备完全一致。     

直升机训练模拟器评分系统的设计与实现

在飞行训练中,需要客观的考核飞行员的飞行技术和飞行质量。依据训练大纲及某型直升机的机载参数记录仪的飞行数据,分析了直升机模拟器评分系统的功能需求,提出了包括模拟飞行分析模块、考核信息管理模块和评分系统维护模块三个功能在内的系统技术方案;详细阐述了模拟飞行分析模块中的关键技术:标准数据库建立和成绩评定原理;最后以起落航线评分为例,证明了评分系统能对飞行成绩及相关飞行信息进行自动管理,并能快速、准确评定飞行训练效果。     

Digital twin-based framework for wireless multimodal interactions over long distance

Wireless multimodal interactions over long distance (WMILD) would give rise to numerous thrilling applications, such as remote touching and immersive teleoperations. However, long distances can induce large propagation delays, which makes it difficult to meet the ultra-low latency requirements in haptic-visual interactions. Considering existing works mainly focused on the wireless access part, this paper designs an end-to-end framework for general WMILD applications based on the digital twin (DT) technology and proposes an intelligent resource allocation and parameter compression scheme to guarantee WMILD performance under constraint network resources. In the framework, user device can acquire real-time remote interactions by performing local interactions with nearby base station (BS), where a DT of the remote side is deployed to predict the remote haptic-visual feedbacks. A reliable DT updating process is carefully designed to guarantee the DT accurately model its dynamic physical counterpart. To optimize the updating reliability, we formulate the resource allocation and parameter compression to be a constraint-Markov decision problem, under the constraints on energy consumption, multimodal interactions and updating latencies. Then, a safe deep reinforcement learning algorithm is proposed to adapt resources and compression according to the dynamic DT updating workload, multimodal data-streams and remote transmission capacities. Simulation shows the framework can achieve high updating reliability compared with baselines.     

IoTFLiP: IoT-based flipped learning platform for medical education

Case-Based Learning (CBL) has become an effective pedagogy for student-centered learning in medical education, which is founded on persistent patient cases. Flippped learning and Internet of Things (IoTs) concepts have gained significant attention in recent years. Using these concepts in conjunction with CBL can improve learning ability by providing real evolutionary medical cases. It also enables students to build confidence in their decision making, and efficiently enhances teamwork in the learing environment. We propose an IoT-based Flip Learning Platform, called IoTFLiP, where an IoT infrastructure is exploited to support flipped case-based learning in a cloud environment with state of the art security and privacy measures for personalized medical data. It also provides support for application delivery in private, public, and hybrid approaches. The proposed platform is an extension of our Interactive Case-Based Flipped Learning Tool (ICBFLT), which has been developed based on current CBL practices. ICBFLT formulates summaries of CBL cases through synergy between students' and medical expert knowledge. The low cost and reduced size of sensor device, support of IoTs, and recent flipped learning advancements can enhance medical students' academic and practical experiences. In order to demonstrate a working scenario for the proposed IoTFLiP platform, real-time data from IoTs gadgets is collected to generate a real-world case for a medical student using ICBFLT.     

A parallel framework for the FE-based simulation of knee joint motion

We present an object-oriented framework for the finite-element (FE)-based simulation of the human knee joint motion. The FE model of the knee joint is acquired from the patients in vivo by using magnetic resonance imaging. The MRI images are converted into a three-dimensional model and finally an all-hexahedral mesh for the FE analysis is generated. The simulation environment uses nonlinear finite-element analysis (FEA) and is capable of handling contact of the model to handle the complex rolling/sliding motion of the knee joint. The software strictly follows object-oriented concepts of software engineering in order to guarantee maximum extensibility and maintainability. The final goal of this work-in-progress is the creation of a computer-based biomechanical model of the knee joint which can be used in a variety of applications, ranging from prosthesis design and treatment planning (e.g., optimal reconstruction of ruptured ligaments) over surgical simulation to impact computations in crashworthiness simulations.     

Integrated fusion framework using hybrid domain and deep neural network for multimodal medical images

Multidimensional Systems and Signal Processing - Nowadays medical images are captured through various imaging modalities for clinical diagnosis. It is more complicated to process the images...     

基于ADAM模块的航空训练模拟器数据采集与控制

针对半实物仿真航空训练模拟器设计实现中操作控制单元多、采集信号类型多、交互实时性高等要求,基于ADAM模块实现了航空训练模拟器的数据采集与控制。采用RS 485串口总线,以ADAM4000系列为分布式I/O模块,构建了主从式测控体系;依据Advantech ADAM4K协议,采用C#模块化设计,建立了点对多半双工通信机制。该采集与控制结构能够实现仿真实装状态的实时采集,满足仿真座舱内各交互设备的可靠控制要求。该软硬件结构在某型航空训练模拟器应用后,取得了较为满意的效果。     

Beyond DoD: non-defense training and education applications of DIS

Networked simulation for education and training is discussed as a functional capability though which distributed interactive simulation (DIS) may find application in the non-defense world. Effectiveness of networked simulation in defense education and training applications has yet to be conclusively demonstrated, but studies completed thus far have yielded positive results. Results from non-defense applications are also likely to be positive. The characteristics of networked simulation that are relevant to its transfer to non-defense applications include a focus on group performance, physical dispersion of participants, requirements for real-time response, emergent task environments, visual task environments, accessible performance data, provisions for practice, immersive realism, and interactions with many entities. These characteristics are matched with potential, non-defense applications of networked simulation such as training for crews, teams, and units, edutainment, education, training, school-to-work transitions, and lifelong learning. Remaining issues include further development of technical standards, legal standards, research and development, fiscal and regulatory policies, and development of the communications infrastructure     

Virtual environments for medical training: graphical and hapticsimulation of laparoscopic common bile duct exploration

We develop a computer-based training system to simulate laparoscopic procedures in virtual environments for medical training. The major hardware components of our system include a computer monitor to display visual interactions between 3D virtual models of organs and instruments together with a pair of force feedback devices interfaced with laparoscopic instruments to simulate haptic interactions. We simulate a surgical procedure that involves inserting a catheter into the cystic duct using a pair of laparoscopic forceps. This procedure is performed during laparoscopic cholecystectomy to search for gallstones in the common bile duct. Using the proposed system, the user can be trained to grasp and insert a flexible and freely moving catheter into the deformable cystic duct in virtual environments. The associated deformations are displayed on the computer screen and the reaction forces are fed back to the user through the force feedback devices. A hybrid modeling approach was developed to simulate the real-time visual and haptic interactions that take place between the forceps and the catheter, as well as the duct; and between the catheter and the duct     

Fusion of multimodal medical images using nonsubsampled shearlet transform and particle swarm optimization

Multidimensional Systems and Signal Processing - Medical imaging has been an indispensable tool in modern medicine in last decades. Various types of imaging systems provide structural and...     

Two-dimensional device simulator for laser diodes: HILADIES

A two-dimensional device simulator for designing laser diodes has been developed. The wave equation and the rate equation for photons, as well as Poisson's equation and the current-continuity equations for electrons and holes, are solved numerically. The letter can reveal precisely the operation mechanism of laser diodes.     

An electromechanical swing-phase-controlled prosthetic knee joint for conversion of physiological energy to electrical energy: feasibility study

Microprocessor-controlled prostheses facilitate a more natural and efficient gait for individuals with above-knee amputations by continually adjusting the level of swing-phase damping. One caveat associated with these technologies is that the user must charge the onboard batteries on a daily basis. It is, therefore, the aim of this study to examine the feasibility of using an electromechanical system to provide prosthetic swing-phase damping and, concomitantly, the function of converting physiological energy that is normally dissipated during the swing phase, to electrical energy. Gait data from a single subject and data from a kinematic simulator were used to develop an empirical model. The findings in this study indicate that an electromagnetic system has appropriate characteristics for use in swing-phase control and also has the potential to recover energy under particular conditions.     

FX: a fast approximate fault simulator for the switch-level usingVHDL

Switch-level faults, as opposed to traditional gate-level faults, can more accurately model physical failures found in an integrated circuit. However, one problem with switch-level fault simulation is that of long simulation times. This paper addresses this problem by performing fast approximate switch-level fault simulation using transistor reverse level ordering, and a novel nine-valued switch-level extension to observability. The probability of propagation of a fault from an arbitrary line of the switch-level circuit to the primary output is shown to be a function of the average node fan-in and the line's distance to primary output. Using this probability, results show one order of magnitude of complexity speed-up as compared to traditional fault simulation techniques, while maintaining good accuracy     

A system for medical consultation and education using multimodalhuman/machine communication

We propose a novel application of an interactive and distributed system in medical consultation and education. The presented application uses a multiuser, collaborative environment with multimodal human/machine communication in the dimensions of sight, sound, and touch. The experimental setup, consisting of two user stations, and the multimodal interfaces, including sight (eye tracking), sound (automatic speech), and touch (microbeam pen), were tested and evaluated. The system uses a collaborative workspace as a common visualization space. Users communicate with the application through a fusion agent by eye tracking, speech, and microbeam pen. The audio/video teleconferencing is also included to help the radiologists to communicate with each other simultaneously while they are working on the mammograms. The system has three software agents: a fusion agent, a conversational agent, and an analytic agent. The fusion agent interprets multimodal commands by integrating the multimodal inputs. The conversational agent answers the user's questions and detects human related or semantic errors and notifies the user about the results of the image analysis. The analytic agent enhances the digitized images using the wavelet denoising algorithm if requested by the user. To evaluate the system, we used it for medical consultation on mammograms. Results also show that the relevant information about the region of interest of the mammograms chosen by the users is extracted automatically and used to enhance the mammograms     

ISAAC: a symbolic simulator for analog integrated circuits

The symbolic simulator ISAAC (interactive symbolic analysis of analog circuits) is presented. The program derives all AC characteristics for any analog integrated circuit (time-continuous and switched-capacitor, CMOS, JFET, and bipolar) as symbolic expressions in the circuit parameters. This yields analytic formulas for transfer functions, CMRR (common-mode rejection ratio), PSRR (power-supply rejection ratio), impedances, noise, etc. Two novel features are included in the program. First, the expressions can be simplified with a heuristic criterion based on the magnitudes of the elements. This yields interpretable formulas showing only the dominant terms. Second, the explicit representation of mismatch terms allows the accurate calculation of second-order effects, such as the PSRR. ISAAC provides analog designers with more insight into the circuit behavior than do numerical simulators and is a useful tool for instruction or designer assistance. Moreover, it generates complete analytic AC circuit models, which are used for automatic sizing in a nonfixed topology analog module generator. The program's capabilities are illustrated with several examples. The efficiency is established by a dedicated sparse-matrix algorithm     

经股四头肌腱关节腔内注射玻璃酸钠治疗膝骨关节炎的疗效观察

目的观察经股四头肌腱行关节腔内注射玻璃酸钠治疗膝骨关节炎(Knee Osteoarthritis,KOA)的疗效。方法对48例KOA患者(70膝)于髌骨上缘经股四头肌腱膝关节腔穿刺注射玻璃酸钠,分别于治疗前及治疗后1月行Hss评分。结果经股四头肌腱膝关节腔穿刺可做到一针穿刺成功。治疗后Hss评分较治疗前明显升高(P<0.01),其中疼痛项、功能项差异有统计学意义。结论经股四头肌腱膝关节腔内注射玻璃酸钠对改善KOA患者临床症状疗效确切、持久,操作简便、成功率高、病人痛苦小。     

EMC and BEM engineering education: physics-based modeling, hands-on training, and challenges

Educational challenges in EMC-BEM engineering and related issues are discussed in this paper. The importance of physics-based modeling and hands-on training are emphasized. Characteristic cases in EMC tests, measurements, modeling, and simulation are presented. Finally, some suggestions and a short-course outline are given for modern EMC-BEM education.     

EMC and BEM engineering education: physics-based modeling, hands-on training, and challenges

Educational challenges in EMC-BEM engineering and related issues are discussed in this paper. The importance of physics-based modeling and hands-on training are emphasized. Characteristic cases in EMC tests, measurements, modeling, and simulation are presented. Finally, some suggestions and a short-course outline are given for modern EMC-BEM education.