基于GAN序列的卫星数据接收系统故障定位     

王正晟  李亚林  张洪群 《中国科学院大学学报》2023,40(1):109-118

现有的卫星数据接收系统故障定位方法受困于专家知识的难以获取。提出一种基于生成对抗网络(GAN)序列的故障定位方法GANseq。利用故障传播特性,将接收系统分解为M个信号处理单元(SPU),形成一个按照信号处理顺序排列的SPU序列;将故障定位问题转化为有序排列的M个异常检测子问题,其中第m个子问题为对前m个SPU的联合状态的异常检测;然后针对每个子问题采用基于GAN的状态参数检测模型,进而形成GAN序列;综合分析该序列在所有子问题上的检测结果以定位故障SPU。利用实际接收系统进行的实验证明所提出的GANseq不仅从数据驱动的角度完成了故障定位,而且在总体上降低了虚警率,并提高了定位精度。  相似文献   

Exploring the effects of substituting basketball players in high-level teams     

Miguel-Ángel Gómez  Roberto Silva  Alberto Lorenzo  Rasa Kreivyte  Jaime Sampaio 《Journal of sports sciences》2017,35(3):247-254

Substituting basketball players during competition is a key process to optimise collective performance. Available research on this topic is scarce, probably due to the difficulty in isolating these effects; thus, the aim of this study was to identify the temporal effects of substitutions in basketball (Spanish professional basketball league). The sample was composed of 1118 substitutions gathered from 21 basketball games. The analysed variables were coach-controlled (player and team’s personal fouls, player in and player out roles, player’s in and out minutes on-court and timeout situation); on-court (foul committed, free throws, 2- and 3-point field-goal effectiveness) and situational variables (scoreline, quality of opposition, game location and game quarter). The results showed positive scoring performances after the substitution for all the analyses. During the first quarter, there were significant effects for fouls committed, scoreline and game location after the substitution. The player’s out personal fouls, free-throw effectiveness, player in, minutes on-court player in, timeout situation and 3-point field-goal effectiveness were significant during the second quarter. The team’s personal fouls, game location, and scoreline were identified as important in the third quarter. The fourth quarter did not show significant effects on the independent variables. Current findings allow optimising coaches’ plans and team management of on-court and bench players throughout the game.  相似文献   

Optimal restructuring strategies under various dynamic factors     

MENG Qing-xuan 《浙江大学学报(A卷英文版)》2007,8(6):932-938

Corporate restructuring was identified as a new industrial force that has great impact on economic values and that therefore has become central in daily financial decision making. This article investigates the optimal restructuring strategies under different dynamic factors and their numerous impacts on firm value. The concept of quasi-leverage is introduced and valuation models are built for corporate debt and equity under imperfect market conditions. The model＇s input variables include the quasi-leverage and other firm-specific parameters, the output variables include multiple corporate security values. The restructuring cost is formulated in the form of exponential function, which allows us to observe the sensitivity of the variation in security values. The unified model and its analytical solution developed in this research allow us to examine the continuous changes of security values by dynamically changing the coupon rates, riskless interest rate, bankruptcy cost, quasi-leverage, personal tax rate, corporate taxes rate, transaction cost, firm risk, etc., so that the solutions provide useful guidance for financing and restructuring decisions.  相似文献   

大学生职业自我效能、职业价值观与就业能力的关系     

陈功香  芦吉虎 《中国特殊教育》2011,19(10)

在对204名大四学生采取问卷调查的基础上,探讨了大学生职业自我效能、职业价值观与就业能力的关系,结果表明:(1)职业自我效能、职业价值观和就业能力中的职业成长能力存在显著相关.(2)文科生的职业自我效能、就业能力高于理科生.(3)高职业自我效能和高职业价值观的大学生的就业能力均高于低自我效能和低职业价值观的大学生.(4)职业决策自我效能在职业价值观和就业能力之间起中介作用.  相似文献   

Orienting Schools Toward Equity: Subgroup Accountability Pressure and School-Level Responses     

Rachel Garver 《The Educational forum》2017,81(2):160-174

Abstract

This article examines school-level responses to subgroup accountability pressure through an ethnographic case study of a school cited for failing to make adequate yearly progress for student subgroups. Concerns about the calculations and measures used to derive the citation and reservations about acting on accountability data delegitimized the citation and rendered the identified subgroups irrelevant to daily practice. Under district guidance, compliance with subgroup accountability was independent of the school's internal efforts to promote equity.  相似文献   

Metaphors we’re colonised by? The case of data-driven educational technologies in Brazil     

Giselle Martins dos Santos Ferreira  Luiz Alexandre da Silva Rosado  Márcio Silveira Lemgruber  Jaciara de Sá Carvalho 《Learning, Media and Technology》2020,45(1):46-60

ABSTRACT

This article discusses issues concerning the spread of data-driven educational technologies in Brazil. Here, as elsewhere, educational technology continues to be promoted optimistically as the bearer of a panacea for historically-rooted social problems. Whilst some of these technologies have indeed contributed to important widening-participation programmes in the last two decades, widespread advocacy of technological ‘solutionism’, reflected in gradually stronger policy demands for efficiencies to be improved through ‘innovation’, has supported a relentless marketisation of the country’s educational systems. As transnational corporations position themselves to take control of key areas of these systems, threatening to restructure the whole sector, data-driven educational technologies provide the latest example in a series of ‘new’ ideas offered in an ever-expanding market. Based on the notion of ‘conceptual metaphors’, which encapsulate specific ways of perceiving, thinking and relating with the world, this article examines key metaphors underpinning discourses surrounding data-driven educational technologies in Brazil. In particular, the article analyses ways in which these specific metaphors may be promoting perspectives that ignore difference and obscure broader questions concerning education, thus contributing to the reproduction of previously existing problems and supporting new forms of colonisation.  相似文献   

企业决策的诚信分析     

刘祚柱 《南宁职业技术学院学报》2007,12(1):91-93

企业决策的诚信分析是市场经济的需求,也是决策理论的重要课题。影响企业诚信决策的要素有个体层面、组织层面、社会层面和利益相关者等。一个完整的企业决策过程包括提出问题、确定目标→信息整合、设计方案→分析方案、选定方案→执行决策、信息反馈。  相似文献   

主成分分析法在工业经济效益指标评价中的应用     

赵海青 《保定师专学报》2004,17(4):12-14

主成分分析法能够在保证原始数据信息损失最小的情况下，以少数的综合变量取代原有的多维变量，使数据结构简化，并且客观地确定权数，避免主观随意性，是经济效益综合评价的一种简单易行的有效方法．运用第一主成分分析，对全国16个省、直辖市的主要工业经济效益进行排序．  相似文献   

智能情报分析模式:数据驱动型与知识驱动型     

邱韵霏  李春旺 《情报理论与实践》2020,43(2):28-34

[目的/意义]研究智能情报分析模式特点、发展方向及研究建设策略。[方法/过程]在分析神经网络、知识工程两类人工智能核心技术演变过程及发展趋势的基础上,提出支撑智能情报分析服务的大数据资源体系框架结构及建设原则,并分析数据驱动和知识驱动方法在情报分析中的单独应用与融合发展问题。[结果/结论]认为数据和知识双轮驱动是智能情报分析未来发展的一个方向;而实现智能情报分析的关键,一是加强一次数据资源和二次数据资源建设,二是加强深度学习技术与知识图谱技术在科技情报分析中应用的研究,三是建立数据驱动与知识驱动相融合的分析模式。  相似文献   

中国定圆足球梦——再论球艺     

茅鹏 《体育与科学》1997,(3)

事业的长期停滞常由于基本理论的失误。我国足球长期奉行的基本理论,在自然体育学方面,就是体能与技战术分家而以体能为基础;在社会体育学方面,就是用行政手段统一全国训练方法的大框架。从足球建设丰富的经验教训来看,一些重大的学术问题已经提到面前,需要研究解决。在这个基础上形成进步的战略决策,中国定圆足球梦。  相似文献