对现代教育技术应用度的深度反思

随着信息技术的迅猛发展,现代教育技术在教育教学中的应用越来越广泛。教学中应用现代教育技术已成为一种全新的教学手段,克服了传统教育手段的诸多弊端,提高了课堂教学效率,但同时也超出了应有的限度,即机器代替教师,忽略了教师服务于教学的价值与意义。因此,如何在教学中适度应用现代教育技术已成为摆在教师面前急需解决的问题。本文主要就教学中如何合理把握应用现代教育技术的"度"的问题谈谈自己的看法与体会,从而引发人们反思教育技术的应用,在注意发挥教师的主观能动作用的同时,最大限度地发挥现代教育技术作用,以提高教学质量。

小型水电站计算机监控系统应用度探讨

近年来随着计算机技术的发展,我国老旧水电站陆续进行技术改造,在小水电站采用计算机监控已经非常普遍。通过对小水电计算机监控技术发展的介绍,提出小型水电站计算机监控系统应用度概念,探讨计算机监控理念、监控方式、监控模式及其组成结构在小水电的恰当应用。

基于属性识别理论的电子商务应用度评价

本文首先分析了企业应用电子商务的特点,确定了评价电子商务应用深度的指标体系。其次应用属性识别模型来评价电子商务应用深度的等级。在确定二级评价指标的属性权重时,采用熵值法这一客观性方法来确定。最后文章通过实例,将这种方法应用于具体的评价,为企业电子商务应用深度提供了一种量化处理的方法。

病案信息管理应用于医院管理中的价值

目的分析病案信息管理应用于医院管理中的价值。方法选取天津市宁河区医院病案室于2019年2—9月整理的500份病历作为研究对象,采用抽签方式将其随机分为研究组和对照组,分别应用病案信息管理和常规的病历管理,对比两组病历的应用度。结果研究组病历中有40份应用于医学教学、有75份应用于科学研究,有128份应用于医疗保险,总应用度为97.20%;对照组病历中有30份应用于医学教学、有58份应用于科学研究,有96份应用于医疗保险,总应用度为73.60%,组间差异有统计学意义(P<0.05)。结论在医院管理中对病历应用病案信息管理有助于提高病历的应用度,效果显著。

信息化在中国的发展

进入新世纪以来,中国的信息化取得了快速的发展和显著的成就。首先利用描述信息化发展的S曲线,对中国信息化发展的情况进行了全面的介绍和评估。大量的数据表明,作为信息化基础的就绪度快速提升,体现信息化现状的应用度正向纵深发展,反映信息化带动经济社会发展的影响度则日益显著。然而,与发达国家相比,中国信息化仍然存在着极大的发展空间,也因而伴随着巨大的发展机遇。最后从我国的实际情况出发,讨论了我国信息化在向着全方位、深层次方向发展的过程中,需要重点关注的一些问题。

“一带一路”国家电子商务发展指数研究

电子商务发展指数是对“一带一路”沿线国家电子商务发展水平测度的重要形式.本文采用对称性设计指数编制方法,构建了“一带一路”沿线国家的电子商务发展综合评价体系,对其电子商务发展水平进行对比分析.研究发现:“一带一路”沿线国家的电子商务就绪度水平落后于应用度;具有电子商务发展优势的国家较少,在电子商务发展水平上,欧盟国家的总体情况良好,中西亚国家处于中等偏下水平,东南亚国家整体落后.

浅议大数据背景下事业单位人事档案管理工作

信息化时代下,各行业对数据的掌握和应用程度一定意义上决定了行业的发展程度。大数据背景下,事业单位人事档案管理工作面临着巨大的困境,但也有着新的发展契机,如摆脱传统的管理模式,弥补以往的信息统计不及时、信息应用度较低、管理效率低下等的不足,因此,探索信息化人事档案管理新发展势在必行。基于此,文章对大数据背景下事业单位人事档案管理工作进行浅议,首先论述大数据含义及人事档案创新管理,其次论述事业单位人事档案管理存在的问题,最后论述大数据背景下优化人事档案管理措施,以供参考。

2D multi-scale hybrid optimization method for geophysical inversion and its application

Local and global optimization methods are widely used in geophysical inversion but each has its own advantages and disadvantages. The combination of the two methods will make it possible to overcome their weaknesses. Based on the simulated annealing genetic algorithm （SAGA） and the simplex algorithm, an efficient and robust 2-D nonlinear method for seismic travel-time inversion is presented in this paper. First we do a global search over a large range by SAGA and then do a rapid local search using the simplex method. A multi-scale tomography method is adopted in order to reduce non-uniqueness. The velocity field is divided into different spatial scales and velocities at the grid nodes are taken as unknown parameters. The model is parameterized by a bi-cubic spline function. The finite-difference method is used to solve the forward problem while the hybrid method combining multi-scale SAGA and simplex algorithms is applied to the inverse problem. The algorithm has been applied to a numerical test and a travel-time perturbation test using an anomalous low-velocity body. For a practical example, it is used in the study of upper crustal velocity structure of the A＇nyemaqen suture zone at the north-east edge of the Qinghai-Tibet Plateau. The model test and practical application both prove that the method is effective and robust.

Analysis on Differences in Photosynthetic Characteristics of Korla Fragrant Pear among Different Planting Densities

[Objective] The aim of this study was to explore the differences in photosynthetic characteristics of Korla fragrant pear among different planting densities,providing a basis for the improvement of fruit yield and quality of Korla fragrant pear in production. [Method] The net photosynthetic rates, photoresponse curves and CO2 response curves of Korla fragrant pear under six different planting densities were determined using Li-6400 XT portable photosynthesis system. [Result] There were significant differences in photosynthetic parameters of Korla fragrant pear among six different planting densities. The net photosynthetic rate of Korla fragrant pear was highest under the planting density of 4.0 m × 6.0 m. At the planting density of4.0 m×6.0 m, when the light intensity reached 1 800 μmol/（m^2·s）, the net photosynthetic rate of Korla fragrant pear reached the peak [19.326 μmol/（m^2·s）], and the apparent quantum yield, carboxylation efficiency and dark respiration rate all reached the maximum values; at the planting density of 6.0 m ×7.0 m, Korla fragrant pear showed lower light compensation point and CO2 compensation point, but higher light saturation point. At the planting density of 3.0 m ×5.0 m, Korla fragrant pear had higher light saturation point. [Conclusion] Among the six different planting densities,Korla fragrant pear with planting density of 4.0 m ×6.0 m showed the highest net photosynthetic rate. It suggested that Korla fragrant pear, at the planting density of4.0 m ×6.0 m, had stronger utilization capacity for low light and low-concentration CO2. Therefore, the Korla fragrant pear with the planting density of 4.0 m ×6.0 m has the highest photosynthesis efficiency, and the planting density of 4.0 m ×6.0 m is the most ideal planting density for Korla fragrant pear.

Application of Microcalorimetric Technique for the Screening and Examination of Medicines

According to the heating effect caused by interaction between matters,a series of experiments on the interaction between drugs and cells from human bodies,DNA and physiological saline have been carried out with a MS-80 standard Calvet microcalorimeter.The experiments include: (1) Thermokinetic studies of the effect of anticancer drugs [sodium norcantharidate (ASN),the bioac- tire materials (Sp.P and Sp.S) from algae etc.]on the cancer cells [Hela,human breast carcinoma (Bcap-37),human adenocarcinoma gastric cells (SGc-7901 and MCF-7) etc.] and the normal cells from human bodies [diploid fibroblasts from human fetal lung (2BS) etc.] at 310.15 K:(2) Studies of the in- tercalation binding of some alkaloidal drugs with the bioactivity to inhibit monoamine oxidase (harmalinc and harmine etc.) to call thymus DNA in neutral aqueous solution at 298.15 K:(3) Studies of the interaction between long acting drugs (long acting oral contraceptive-norgestrel etc.) and slow- releasing drug (Contac) and aqueous solution of 0.9% NaCI at 310.15 K.All the experimental results have given their characteristic thermograms and the interaction enthalpy changes.On the analysis of all the results,the authors put forward a method on application of microcalorimetric technique for screen- ing and examination of medicines.The principle of application and the experimental operation of this method have been expounded,and some results of the above experiments have been discussed.As one of the methods for screening and examining medicines,the microcalorimctric method has some distin- guished features and advantages over other methods.

基于纤维增强复合材料的机械加工技术

在建筑领域复合材料的应用日益广泛,强化合金在生活中较为常用,且金属陶瓷也是应用度较高的复合材料之一,这些复合材料的应用都对社会的建设以发展起到了积极的推动作用。基于此,本文首先分析了纤维复合材料的性能,阐述了该材料的加工特点,并对不同的纤维增强复合材料的机械加工技术展开了探讨,以期为机械加工企业合理进行加工提供参考。

A Nonlinear Restoring Effect Study of Mooring System and its Application

Mooring system plays an important role in station keeping of floating offshore structures. Coupled analysis on mooring-buoy interactions has been increasingly studied in recent years. At present, chains and wire ropes are widely used in offshore engineering practice. On the basis of mooring line statics, an explicit formulation of single mooring chain/wire rope stiffness coefficients and mooring stiffness matrix of the mooring system were derived in this article, taking into account the horizontal restoring force, vertical restoring force and their coupling terms. The nonlinearity of mooring stiffness was analyzed, and the influences of various parameters, such as material, displacement, pre-tension and water depth, were investigated. Finally some application cases of the mooring stiffness in hydrodynamic calculation were presented. Data shows that this kind of stiffness can reckon in linear and nonlinear forces of mooring system. Also, the stiffness can be used in hydrodynamic analysis to get the eieenfrequencv of slow drift motions.

Do statins reduce hepatitis C RNA titers during routine clinical use?

AIM: To compare hepatitis C virus (HCV) titers in patients with chronic hepatitis C with and without exposure to 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins).METHODS: Medical records were reviewed for 6463 patients with documented HCV infection at a single center between March 2004 and September 2006. Patients with confi rmed viremia and meeting inclusion criteria were assigned to one of three groups: Group A (n = 50), dyslipidemic patients with statin usage during HCV RNA polymerase chain reaction (PCR) determination; Group B (n = 49), dyslipidemic patients with prior or future statin usage but not at the time of HCV RNA PCR determination; and Group C (n = 102), patients without statin usage during the study period. The primary analysis explored the effect of statin therapy on HCV viremia. Secondary analyses assessed class effect, dose response, and effect of other lipid-lowering therapies on HCV viral titers.RESULTS: Median HCV RNA titers did not signif icantly differ among the three groups (Group A: 4 550 000 IU/mL, Group B: 2 850 000 IU/mL, Group C: 3 055 000 IU/mL).For those subjects with longitudinal assessment of HCV viremia prior to and while on statins, there were no signif icant differences between pre- and post-HCV viral titers. Additionally, no differences in HCV titers were observed at any dose level of the most prescribed statin, simvastatin. However, hypertriglyceridemia independently correlated with HCV titers, and niacin exposure was associated with signif icantly lower viral titers (P < 0.05).CONCLUSION: There was no apparent effect of statins on HCV viral replication in this analysis. Further investigation is warranted to explore the possible antiviral properties of triglyceride-lowering agents and their potential role as adjuncts to standard HCV therapy.

Optimization model of unascertained measurement for underground mining method selection and its application

An optimization model of underground mining method selection was established on the basis of the unascertained measurement theory.Considering the geologic conditions,technology,economy and safety production,ten main factors influencing the selection of mining method were taken into account,and the comprehensive evaluation index system of mining method selection was constructed.The unascertained evaluation indices corresponding to the selected factors for the actual situation were solved both qualitatively and quantitatively.New measurement standards were constructed.Then,the unascertained measurement function of each evaluation index was established.The index weights of the factors were calculated by entropy theory,and credible degree recognition criteria were established according to the unascertained measurement theory.The results of mining method evaluation were obtained using the credible degree criteria,thus the best underground mining method was determined.Furthermore,this model was employed for the comprehensive evaluation and selection of the chosen standard mining methods in Xinli Gold Mine in Sanshandao of China.The results show that the relative superiority degrees of mining methods can be calculated using the unascertained measurement optimization model,so the optimal method can be easily determined.Meanwhile,the proposed method can take into account large amount of uncertain information in mining method selection,which can provide an effective way for selecting the optimal underground mining method.

Application of empirical mode decomposition in early diagnosis of magnetic memory signal

In order to eliminate noise interference of metal magnetic memory signal in early diagnosis of stress concentration zones and metal defects, the empirical mode decomposition method combined with the magnetic field gradient characteristic was proposed. A compressive force periodically acting upon a casing pipe led to appreciable deformation, and magnetic signals were measured by a magnetic indicator TSC-1M-4. The raw magnetic memory signal was first decomposed into different intrinsic mode functions and a residue, and the magnetic field gradient distribution of the subsequent reconstructed signal was obtained. The experimental results show that the gradient around 350 mm represents the maximum value ignoring the marginal effect, and there is a good correlation between the real maximum field gradient and the stress concentration zone. The wavelet transform associated with envelop analysis also exhibits this gradient characteristic, indicating that the proposed method is effective for early identifying critical zones.

Adaptive Application Offloading Decision and Transmission Scheduling for Mobile Cloud Computing

Offloading application to cloud can augment mobile devices' computation capabilities for the emerging resource-hungry mobile application, however it can also consume both much time and energy for mobile device offloading application remotely to cloud. In this paper, we develop a newly adaptive application offloading decision-transmission scheduling scheme which can solve above problem efficiently. Specifically, we first propose an adaptive application offloading model which allows multiple target clouds coexisting. Second, based on Lyapunov optimization theory, a low complexity adaptive offloading decision-transmission scheduling scheme has been proposed. And the performance analysis is also given. Finally, simulation results show that,compared with that all applications are executed locally, mobile device can save 68.557% average execution time and 67.095% average energy consumption under situations.

Application of Choline Chloride·xZnCl2 Ionic Liquids for Preparation of Biodiesel

The inexpensive and moisture-stable Lewis-acidic ionic liquids were prepared and applied for transesterification of soybean oil to biodiesel.The influences of molar ratio of methanol to soybean oil,reaction temperature and amount of ionic liquids were investigated.The transesterification of soybean oil to biodiesel catalyzed by choline chloride·xZnCl2 ionic liquids showed many advantages such as mild conditions and lower cost.On the other hand,the non-ideal yield and complicated separation between biodiesel and soybean oil were also investigated and analyzed.The improvement on the systems of choline chloride·xZnCl2 was proposed for further investigation.

Application of artificial neural network to predict Vickers microhardness of AA6061 friction stir welded sheets

The application of friction stir welding(FSW) is growing owing to the omission of difficulties in traditional welding processes. In the current investigation, artificial neural network(ANN) technique was employed to predict the microhardness of AA6061 friction stir welded plates. Specimens were welded employing triangular and tapered cylindrical pins. The effects of thread and conical shoulder of each pin profile on the microhardness of welded zone were studied using tow ANNs through the different distances from weld centerline. It is observed that using conical shoulder tools enhances the quality of welded area. Besides, in both pin profiles threaded pins and conical shoulders increase yield strength and ultimate tensile strength. Mean absolute percentage error(MAPE) for train and test data sets did not exceed 5.4% and 7.48%, respectively. Considering the accurate results and acceptable errors in the models' responses, the ANN method can be used to economize material and time.

Application of dynamic analysis of strength reduction in the slope engineering under earthquake

At present,the methods of analyzing the stability of slope under earthquake are not accurate and reasonable because of some limitations. Based on the real dynamic tensile-shear failure mechanism of slope,the paper proposes dynamic analysis of strength reduction FEM (finite element method) and takes the reduction of shear strength parameters and tensile strength parameters into consideration. And it comprehensively takes the transfixion of the failure surface,the non-convergence of calculation and mutation of displacement as the criterion of dynamic instability and failure of the slope. The strength reduction factor under limit state is regarded as the dynamic safety factor of the slope under earthquake effect and its advantages are introduced. Finally,the method is applied in the seismic design of anchors supporting and anti-slide pile supporting of the slope. Calculation examples show that the application of dynamic analysis of strength reduction is feasible in the seismic design of slope engineering,which can consider dynamic interaction of supporting structure and rock-soil mass. Owing to its preciseness and great advantages,it is a new method in the seismic design of slope supporting.

Design and performance analysis of adaptive ordered LDPC coded OFDM system

A novel adaptive ordered LDPC （low-density parity-check） coded OFDM （orthogonal frequency-division multiplexing） transmission technique is proposed to exploit different error probabilities of irregular LDPC coded bits in OFDM systems. Assuming that the CSI （channel state information） is known at the transmitter, the irregular LDPC coded bits are ordered according to their degrees and then allocated into subcarriers adaptively. Bits with higher degrees are allocated into less attenuated subcarriers and bits with lower degrees are allocated into deep attenuated subcarriers. Quantization on CSI feedback can be applied to minimize the signaling overhead. Performance of this strategy is analyzed by density evolution and numerical simulation. Simulation results show that about a 1 to 1.5 dB gain in terms of SNR （ signal to noise ratio） can be achieved over frequency-selective fading channels compared to conventional LDPC coded OFDM systems without ordering, and the proposed scheme is robust to CSI quantization.