科研大数据平台关键技术与实践

首先,以高能物理领域数据处理为例,分析了支撑科学研究的大数据平台在存储和处理能力、传输和共享等方面的挑战,说明现有技术已经难以满足日益快速增长的数据处理需求。然后,给出了科研大数据平台的典型架构,并讨论科研大数据平台的关键技术,包括数据采集与清洗、数据存储、数据处理、数据传输、数据共享与安全等技术,同时介绍了各种关键技术的研究现状或者主流系统。最后,介绍了中国科学院高能物理研究所科研大数据开放平台的建设思路和实现框架,该平台试图解决目前大数据发展过程中面临的一些问题,如数据开放和跨领域融合不够、跨地域数据传输性能低等,从而激活数据价值,降低应用门槛。     

TRIP带钢轧后冷却过程温度场的有限元模拟

应用有限元模拟仿真计算，对相变诱发塑性(TRIP)带钢在连轧机精轧后由850～890℃快冷至700℃，经几秒钟短暂空冷再第2次快速水冷至卷取温度400℃的冷却过程的温度进行了分析计算。分析结果得出，3mmTRIP带钢厚度方向的温差较小，而8mmTRIP带钢厚度方向温差明显增大。因此TRIP带钢在2次快速冷却后和卷取前应有适当的空冷时间以降低TRIP带钢卷取时表面和厚度方向中心处的温度差。     

Research on theory and key technology of trusted computing platform security testing and evaluation

Trusted computing has become a new trend in the area of international information security, and the products of trusted computing platform begin to be used in application. Users will not use the products of information security, unless it goes through the testing and evaluation. Here we concentrate on the testing and evaluation problem of trusted computing platform, begin with constructing proper formalization model of trusted computing platform for testing, and establish a mathematical chain of trust model...     

被动目标定位系统观测平台的最优机动轨迹

对仅有方位量测的被动目标定位中观测平台最优机动轨迹问题进行了探讨.在最大化Fisher信息阵 (FIM)行列式指标下给出了当前时刻一种新的机动控制策略,从理论上证明了最优机动轨线有且仅有2支,并给出了最优机动策略和最优机动轨线方程;它的特点是对任意时刻均为最优,而不仅仅在观测时间的末端,几何直观描述了机动控制序列的可执行性;与最大化方位变化率下观测平台最优机动轨线相比较,本文的机动策略兼顾了距离和方位2个因素的影响,可看成是对距离信息和方位信息之间的折中.数字仿真表明,与传统方法比较,提出的新机动策略能获得更大的信息.     

An integrated research tool for X-ray imaging simulation

This paper presents a software simulation package of the entire X-ray projection radiography process including beam generation, absorber structure and composition, irradiation set up, radiation transport through the absorbing medium, image formation and dose calculation. Phantoms are created as composite objects from geometrical or voxelized primitives and can be subjected to simulated irradiation process. The acquired projection images represent the two-dimensional spatial distribution of the energy absorbed in the detector and are formed at any geometry, taking into account energy spectrum, beam geometry and detector response. This software tool is the evolution of a previously presented system, with new functionalities, user interface and an expanded range of applications. This has been achieved mainly by the use of combinatorial geometry for phantom design and the implementation of a Monte Carlo code for the simulation of the radiation interaction at the absorber and the detector.     

A novel intelligent verification platform based on a structured analysis model

An intelligent verification platform based on a structured analysis model is presented.Using an abstract model mechanism with specific signal interfaces for user callback,the unified structured analysis data,shared by the electronic system level design,functional verification,and performance evaluation,enables efficient management review,auto-generation of code,and modeling in the transaction level.We introduce the class tree,flow parameter diagram,structured flow chart,and event-driven finite state machine as structured analysis models.As a sand table to carry maps from different perspectives and levels via an engine,this highly reusable platform provides the mapping topology to search for unintended consequences and the graph theory for comprehensive coverage and smart test cases.Experimental results show that the engine generates efficient test sequences,with a sharp increase in coverage for the same vector count compared with a random test.     

模拟电子技术课程的PBL选题设计与思考

PBL模式强调把学习设置于复杂的、有意义的问题情境中,是一种以自主学习为特色的教学模式。介绍了在重庆大学UC学院的 “Electronics” 全英文课程中开展PBL教学模式的实施过程,特别讲述了对问题设计的选择与思考。从教学观察和学生反馈来看,PBL模式有助于学生以点带面的知识建构,培养学生的自主学习、分工协作解决问题的能力和素质。     

依托超星平台实现电子技术实验考核

分析目前电子技术实验考核中存在的问题,以模拟电子技术实验为例,依托超星平台,建立了多维度的过程性考核体系。利用超星平台的统计和评价功能,将学生的成绩分为线上和线下两部分,线上成绩包括预习和测验。线下成绩包括实验操作,实验报告和素养成绩。实践证明,多维度的过程性考核体系能大大提高学生的学习兴趣、能够提升学生的综合能力和创新能力、能够全面客观地评价学生的学习效果和极大地提升实验教学质量     

四旋翼无人机新工科人才培养的教学探索

近年来无人机技术及市场发展迅速,年复合增速达60%呈井喷式增长,导致各行业对无人机技术人才产生巨大需求。针对无人机技术人才短缺,提出一种“一论二仿三实践”的无人机新教学体系,探索新工科背景下四旋翼无人机综合性实践人才培养机制。通过以四旋翼无人机应用的理论知识为基础,学生自主搭建无人机数字仿真平台,小组形式实操四旋翼无人机飞行等教学活动,形成一套“1+1+1>3”的新教学模式。     

虚拟实验系统在“传感器与测试技术”课程中的应用

面向专业背景以力学、结构设计为主的飞行器设计与工程专业本科生,将“传感器与测试技术”课程内容与航空航天应用相结合,能够加深学生对传感器原理的理解、提高对测试技术的掌握,并促进理论和实践的联系。以飞行器结构无损检测的具体应用案例为基础,开展了结构虚拟检测实验平台的建立,探讨虚拟实验在“传感器与测试技术”课程中融入、运行和评测的方式,满足了学生动手操作实验的需求,实现了书本知识和应用的有机融合,促进了学生自主和探索式的学习。