医用计算机教学中采用正误法评定学生成绩的探讨

长期以来,计算机的机房学习效果比较差已是大家的共识。老师已经想了很多办法来提高教学水平,改善教学方法,但学生的学习积极性总是不见高涨,学习效果依然低下。笔者从学生最关心的成绩入手,采用正误法来评定学生成绩,极大地刺激了学生的学习积极性,提高了计算机课程的学习效果。

采用正误法进行学生成绩

本文报告了在目标教学模式下对学生成绩采用正误法进行综合性评定的探讨，结果表明，在学生成绩评定时，结合态度目标、技能目标和认知目标对学生成绩进行综合评定，并用正误法表达评定结果，是切合目标教学理论要求的，并且深受学生欢迎。本文认为，在目标教学模式下，对学生成绩评定应全面推广正误法，取消百分制，并相应调整学生评“三好”

幼教思辨法

幼教思辨法是通过对事物和问题采取超越常规、新颖独特、灵活多变的思考辨别方式,来训练和开发幼儿创造性思维能力的一种实用思维训练方法。它属于较高层次的智力技巧,是一门成功的思维艺术。 一、几种方法 心理学告诉我们,智力的核心是思维。幼儿正处在思维发展的初始阶段,思维训练搞得好,智力发展则成直线上升。幼教思辨法就是为从根本上提高幼儿智力而编写的思维训练方法。它包括放射法、虚实法、比较法和正误法。

“符号填涂法”在数学教学中的应用

目前在国外的物理、化学、生物、外语等学科教学中,对知识的复习巩固方面广泛采用“符号填涂法”(参看华中师院学报自然科学版,1981年第一期,《符号填涂法的初步研究》展国瑞写)既然这种方法能用于其他学科的教学,当然也可以用于数学教学。利用符号填涂法的教学方式,使学生复习的知识不足点而是面,因此用较少时间可以得到较大的收益。同时还可以广泛而灵活地考查学生握掌和理解基本概念、基本技能的情况。“符号填涂法”的主要命题方式有选择法、组合法、正误法等。 1.

Performance Analysis and Parameter Optimizing Rules of LT Codes

As a new class of forward error correcting encoding algorithm,Luby Transform codes are suitable for the erasure channel environment based on the packet communication.The encoding,decoding algorithms and the implementation of LT codes are summarized in the paper.Meanwhile simulations of the ideal soliton distribution and robust soliton distribution are conducted to evaluate the performance of LT codes in terms of successful decoding probability,mean degree and decoding time over the erasure channel.The parameter optimization rules of LT codes are deeply discussed and proposed in the paper.The research results are of great practical importance for improving the real time performance in the erasure correction applications.

Error correction method of 6-HTRT parallel mechanics

The method of error correction is one of key techniques of parallel robot. A new method of end error correction of 6-HTRT parallel robot is presented for engineering and researching on correlative theory of 6-HTRT parallel robot. The method need calculate many kinematics equations of parallel robot such as position back solution, velocity Jacobin, position forward solution and error Jacobin. New methods presented for solving these questions are simpler and fitter for programming and calculating, because former methods are too complex to use in engineering. These questions may be solved by iterative method of numerical value which has fast velocity of calculating. These new methods may be used in other mechanism of parallel robot too, and so have wider using value. The experimental results demonstrate that the system may satisfy entirely high technical request and fit for engineering in new measures.

Error Analysis on Corrector Formula for Rectangular Rule

This paper presents truncation errors among Corrector Formula for left Rectangular rule and Corrector Formula for middle Rectangular rule respectively. It also displays an analysis on convergence order of compound corrector formulas for rectangular rule. Examples of numerical calculation have validated theoretical analysis.

Tooth surface error correction of hypoid gears machined by duplex helical method

In this work,synchronous cutting of concave and convex surfaces was achieved using the duplex helical method for the hypoid gear,and the problem of tooth surface error correction was studied.First,the mathematical model of the hypoid gears machined by the duplex helical method was established.Second,the coordinates of discrete points on the tooth surface were obtained by measurement center,and the normal errors of the discrete points were calculated.Third,a tooth surface error correction model is established,and the tooth surface error was corrected using the Levenberg-Marquard algorithm with trust region strategy and least square method.Finally,grinding experiments were carried out on the machining parameters obtained by Levenberg-Marquard algorithm with trust region strategy,which had a better effect on tooth surface error correction than the least square method.After the tooth surface error is corrected,the maximum absolute error is reduced from 30.9μm before correction to 6.8μm,the root mean square of the concave error is reduced from 15.1 to 2.1μm,the root mean square of the convex error is reduced from 10.8 to 1.8μm,and the sum of squared errors of the concave and convex surfaces was reduced from 15471 to 358μm^(2).It is verified that the Levenberg-Marquard algorithm with trust region strategy has a good accuracy for the tooth surface error correction of hypoid gear machined by duplex helical method.

Ranging Error Correction Based on a Prior Error Model

Wireless technology provides accurate positioning in indoor environments using time of arrival(TOA) based ranging techniques. However, the positioning accuracy is degraded due to the ranging errors caused by multipath and non-line-of-sight(NLOS) propagation. In this paper, a ranging error correction method is proposed to improve positioning performance. A TOA ranging error model(TREM) is built to provide the prior information for ranging error correction first. The mean value of TREM within a certain interval is used as the ranging error correction value(RECV). As the RECV may be unreasonable sometimes, we adjust it according to the actual positioning situation and then exploit the final RECV to correct ranging data. The experimental results show that the proposed method could well reduce ranging errors and the positioning performance is obviously improved when using corrected ranging data.

Multiple-Symbol Interleaved RS Codes and Two-Pass Decoding Algorithm

For communication systems with heavy burst noise, an optimal Forward Error Correction(FEC) scheme is expected to have a large burst error correction capability while simultaneously owning moderate random error correction capability. This letter presents a new FEC scheme based on multiple-symbol interleaved Reed-Solomon codes and an associated two-pass decoding algorithm. It is shown that the proposed multi-symbol interleaved Reed-Solomon scheme can achieve nearly twice as much as the burst error correction capability of conventional single-symbol interleaved Reed-Solomon codes with the same code length and code rate.

材料作文审题方法

面对材料作文,教师应该教会学生掌握以下的作文审题方法。一、探究本体法探究本体法就是探究所给材料中喻体暗中对应的本体的作文审题方法。例如：有一个人一直想成功,为此他做过种种尝试,但到头来,都以失败告终,他非常苦恼,就跑去问他的父亲。他父亲是一个老船员,他意味深长地对儿子说：＂要想有船来,就必须修建自己的码头。＂儿子听了这话沉思良久。这之后,他不再四处尝试,而是静下心来,好好读书。后来,终有所成。

Wavelength Dispersion Analysis on Fiber-Optic Raman Distributed Temperature Sensor System

The influence of the wavelength dispersion on the temperature accuracy of the Raman distributed temperature sensor system （RDTS） is analyzed in detail, and a simple correction algorithm is proposed to compensate the fiber position error caused by the wavelength dispersion. The principle of the proposed algorithm is described theoretically, and the correction on each point along the entire fiber is realized. Temperature simulation results validate that the temperature distortion is corrected and the temperature accuracy is effectively improved from ＋5 ℃ to ±1 ℃.

Measurement errors and correction of the UAT-2 ultrasonic anemometer

Two kinds of measurement errors have been observed in the recently developed UAT-2 ultrasonic anemometer.One is the flow distortion produced by a"blocking effect",and the other is the angle of attack caused by the vertical misalignment of the instrument.Here,we study these errors and discuss the possible correction methods.Via a wind tunnel experiment and numerical simulation,a 3D calibration matrix was developed to correct the"blocking effect".In the field test,the angle of attack was detected by an inclinometer settled on the reference plane of the anemometer,and the instrumental misalignment or tilt was corrected by a coordinate transformation.The combined use of an inclinometer and the proposed correction method may help find a new approach for vertical velocity correction.