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Search Results: 1 - 10 of 235604 matches for " 陈俊东 "
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网络认知力与学生后设认知、自我效能、情境兴趣之相关研究——以数字逻辑学习为例
Internet Cognitive Failure Predict Vocational Students’ Metacognition, Self-Efficacy, Online Learning Interest by Using Computer Game to Learn Digital Logic
 [PDF]

,, 志杰
Advances in Education (AE) , 2014, DOI: 10.12677/AE.2014.43B017
Abstract:

网页学习的方式为目前信息爆炸时代一种新型态的学习方式,因此本研究目的主要想探讨若将网页游戏式的学习方式套用至高职电子电机类群科中的数字逻辑科目,将会产生甚么样的学习效果,并观察学习者对于网络认知障碍上所产生的影响效果。使用网络进行自学的方式来学习,学习者本身的自我效能与后设认知也会影响学习动机外,本身网络所提供的情境兴趣也是个值得关注的议题。因此本研究透过“Games Free”公司所制作的“Gates Of Logic”小游戏来进行数字学习的实验,针对该游戏进行网站建置发放网络问卷,回收问卷数为103份,扣除4份无效问卷,共有99份问卷进行分析比较,有效问卷之回收率为96.1%,而后使用PLS 1.04结构方程模式进行研究架构配适度实证与分析。而本研究发现网络认知障碍越高,则后设认知与自我效能的部分越低;而后设认知与自我效能越高,则情境兴趣也越高;另情境兴趣越高,则学习动机越高。本研究指出,若网络认知障碍越低的情况下,使用网络进行数字逻辑的学习,本身的学习动机将越良好。

The concept of Digital logic is a fundamental knowledge should be possessed to those students who take electronic courses in vocational high schools or related. There are many educational games or simulations relevant to Digital gates in social network websites, the present study took “Gates of Logic” from “Games Free” website as a learning tool for 2nd years vocational high school students to play with in five minute for three times. According to cognitive-affective interaction in media learning theory, the measuring scales included internet cognitive failure, internet self-efficacy, metacognition, and online learning interest were given to 103 students. Effective data of 99 were subjected to confirmatory factor analysis and structural equation modeling by PLS 1.04. The results of this study revealed that internet cognitive failure was negatively correlated to internet self-efficacy and metacognition. Internet self-efficacy and metacognition were positively associated with online learning interest. The results implied that the internet cognitive failure played the essential role for students to learn “Gates of Logic” and suggested students could take more time with less time pressure to learn those concepts.


应用社群媒体进行汽车修护的学习成效:探讨成就动机与学习兴趣及价值之相关研究
Using Social Media to Enhance Students' Online Learning Interest and Epistemic Value Predicted by Their Achievement Motivation Relevant to Continuance Intention to Learn Auto Repairing
 [PDF]

志杰,,
Advances in Education (AE) , 2014, DOI: 10.12677/AE.2014.43B014
Abstract:

自我导向学习是利用社群媒体学习,这是十分必要的,而成就动机是会影响自我导向学习关键作用,并且对使用社群媒体学习兴趣与学习价值都会有所相关。为了了解上述之关系,本研究改编自Youtube视频,让学生透过拨放或重复拨放影片来学习汽车维修知识。针对高职学生共回收99份有效问卷,并使用PLS 1.04结构方程模式进行研究架构配适度实证与分析。本研究结果显示成就动机与学习兴趣和感知使用社群媒体的学习价值是呈现正相关的。学习兴趣也和感知使用社交媒体的学习价值及持续使用社群媒体的意图有相关。最后,感知学习价值与持续使用意图是呈现正相关。由此研究可以得知,使用社会媒体作为一种自我导向的学习工具将是非常实用的教育环境。

Self-directed learning is very essential to use social media learning, where achievement motivation play the key role of self-directed learning which may be related to individual learning interest in using social media and perceived the value of using social media to learn. To understand this interrelatedness, this study adapted videos from Youtube for students to manipulate the functions of playing speed, or re-playing etc. to learn auto repairing knowledge. Effective data from 99 secondary years of vocational high schools were subjected to confirmatory factor analysis and structural equation modeling by PLS 1.04. The results of this study revealed that achievement motivation was positively correlated to the learning interest and perceived learning value of using social media. The learning interest was also associated with perceived learning value and continuance intention to use social media to learn auto-repairing. Finally, perceived learning value was positively correlated to continuance intention. The implication of this study suggested that using social media as a self-directed learning tool would be very practical in educational settings. 


不确定性风险、治理冲突与审计师选择----来自1998--2004年中国A股IPO市场的经验证据
,,汉文,
浙江大学学报(人文社会科学版) , 2010,
Abstract: ?审计需求偏好及其演进趋势是理解我国经济转型过程中独立审计经济角色,进而评价独立审计制度绩效的重要研究议题。基于我国新股发行市场化改革背景,首次从信息需求和监督需求双重视角进行的实证研究发现,一方面,随着新股发行市场化进程加快,新兴的高质量审计需求开始出现,核准制实施后不确定性风险越低的IPO公司更为偏好高质量审计师。另一方面,尽管一定程度上股东与经理人间的治理冲突与高质量审计需求正相关,但有效市场约束机制的匮乏导致现阶段我国大股东与中小股东间的治理冲突难以引发有效审计需求,而国有控股股东的“所有者缺位”问题则进一步削弱了该需求。上述研究结果表明,当前进一步改善我国资本市场有效审计需求不足问题首先需要解决大股东的有效治理问题。
基于石墨烯光机械系统的光学三极管和相干光学存贮
Optical Transistor and Coherent Optical Storage Based on Graphene Optomechanics System
 [PDF]

, 方贤文, 唐旭, 缪广红, 朱卡的
Applied Physics (APP) , 2015, DOI: 10.12677/APP.2015.510016
Abstract:
原子尺寸厚度的二维纳米材料——石墨烯,由于它对于研究其量子运动行为的独特性质,石墨烯也许是构成纳米机械振子的最终纳米材料。本文在红边带条件下,通过用一个强的微波泵浦场和一个弱的信号场驱动石墨烯纳米机械振子–微波腔耦合系统,理论证明了系统中的光机械诱导透明。在蓝边带条件下,通过计算信号场的透射谱,发现信号场可以实现有效地减弱和放大取决于栅极场(泵浦场)的功率强度。这样在蓝边带下石墨烯光机械系统呈现出类似一个光学三极管实现弱微波信号的放大。此外通过控制强泵浦场,石墨烯光机械系统可以实现快光和慢光效应,并且通过调节腔场与泵浦场之间的失谐能实现快光和慢光效应之间的转换。石墨烯光机械系统对于光的存储将会是一个很有希望的方案,同时对于在通讯和量子信息技术上的应用也指出了一个方向。
Graphene, atomically thin two-dimensional nanomaterials, may be considered as the ultimate nanomaterial for fabricating nanomechanical resonator due to its unique properties for studying its quantum behavior of the motion. In this work, we theoretically demonstrate optomechanically induced transparency based on the coupled graphene nanomechanical resonator-microwave cavity system with a strong microwave pump field and a weak signal field under the condition of red sideband. At the blue sideband, the signal field can be efficiently attenuated or amplified with calculating the transmission spectrum of the signal field, depending on the power of a second “gating” (pump) field which can behave as an optical transistor to amplify a weak microwave field. In addition, the graphene optomechanics can obtain the slow and fast light effect with controlling the strong pump field, and the slow and fast light effect can be switched via adjusting the detuning between the cavity field and the pump field. This scheme may be a promising candidate for light storage and pave the way for numerous applications in telecommunication and quantum information technologies.
添加不同营养助剂对石油污染土壤生物修复的影响
,,张承
环境化学 , 2015,
Abstract: 实验室条件下研究NPK复合肥、诺沃肥和腐殖酸三种物质不同配比添加对石油污染土壤的生物修复效果.在60d的修复实验中,定期取样测定土壤含油量、总异养菌数、石油烃降解菌数和脱氢酶活性,并采用PCR-DGGE技术研究修复过程中微生物多样性变化.结果表明,NPK肥的添加和NPK肥-诺沃肥-腐殖酸复合添加能够提高土壤中微生物的数量、微生物多样性和脱氢酶活性.在含油量为84600mg·kg-1的土壤中,添加营养助剂的处理60d后石油烃降解率为31.3%—39.5%,不添加营养助剂的石油烃降解率仅为3.5%.NPK肥-诺沃肥-腐殖酸复合添加对石油烃的降解率要高于NPK肥的单独添加(高8%),其原因可能是诺沃肥-腐殖酸能够有效提高土著微生物的活性,增加微生物的多样性,增强石油烃的降解.
血清诱捕受体3的水平与膀胱移行细胞癌的关系
,王健,
南方医科大学学报 , 2013,
Abstract: 目的探讨诱捕受体3(dcr3)蛋白在膀胱移行细胞癌患者血清中的表达水平及其与膀胱移行细胞癌发生发展的关系。方法采用用酶联免疫吸附试验(elisa)检测膀胱移行细胞癌患者血清dcr3的水平,分析其与患者年龄、性别、膀胱移行细胞癌病理分级及临床分期的关系。结果膀胱移行细胞癌患者血清中dcr3[(183.43±78.45)pg/m1]的水平明显高于正常人[(116.65±97.43)pg/m1],差异有统计学意义(p<0.05)。膀胱移行细胞癌患者血清dcr3水平与肿瘤的tnm分期、病理分级密切相关(p<0.05);与患者的年龄、性别无关(p>0.05)。结论dcr3表达水平可能与膀胱肿瘤的恶性程度密切相关。
一种基于混沌的代换-置换结构图像加密算法
,昕?,向旭
计算机科学 , 2014, DOI: 10.11896/j.issn.1002-137X.2014.09.030
Abstract: 近年来,随着多媒体技术的发展,互联网上数字图像相关内容和应用的比例越来越高,其安全性也日益受到人们的关注。图像的安全性,一般通过加密方法来保证。图像加密算法中,基于置乱-扩散结构的加密算法因其充分考虑图像数据二维分布的特点,特别适合图像数据的加密。然而,该加密算法存在安全性不高、扩散效率低,以及密钥扩展计算复杂度高等问题。通过引入分组密码学中的代换-置换(sp,substitution-permutation)结构,提出了一种基于混沌的sp结构图像加密算法spcme,该算法采取3种策略:(1)通过混沌映射进行置换和扩散,采用aes算法的s盒进行字节代换,以增强算法安全性;(2)使用双向的置乱-扩散策略,加快扩散速度;(3)运用简单的异或和移位操作,提高密钥扩展效率。为评价该算法的性能,文中做了密钥空间分析、密钥敏感性分析、统计直方图分析、相邻像素相关性分析、信息熵分析、差分攻击分析等大量的性能分析实验。实验结果表明,该算法仅通过3轮迭代就可达到与以前提出的图像加密算法相同的安全级别,加密效率明显提高。
纤维小体在燃料乙醇中的应用
,,黄日波
中国生物工程杂志 , 2011,
Abstract: 纤维小体在木质纤维素的降解中起着重要作用。它不仅含有降解纤维素所需的各种纤维素酶系,而且组装成具有高效催化活性的多酶复合体形式。介绍了纤维小体基本结构与功能,重点概述了其在生物燃料乙醇中的应用并对纤维小体的研究提出了展望。
诱导喷嘴改进滤筒脉冲清灰效果的实验研究
张情,海焱,巨敏,
环境工程 , 2012, DOI: 10.13205/j.hjgc.201201017
Abstract: 改善清灰效果是提高滤筒除尘效率的关键和难点问题。运用自制脉冲喷吹实验台,采用诱导喷嘴(超音速引流喷嘴和气流散射器)对325mm×660mm滤筒进行脉冲喷吹清灰实验研究,并与采用普通喷吹孔的实验结果进行比较分析,得出采用诱导喷嘴时侧壁正压力峰值平均值是普通喷吹孔的1.465倍;且采用诱导喷嘴时各测点的不均衡系数为0.768~1.336,普通喷口为0.270~2.251,而不均衡系数越接近于1,其清灰效果越好;同时,采用诱导喷嘴时各测点基本在同一时刻达到正峰值。实验充分表明采用诱导喷嘴确保了滤筒长度方向上内壁清灰压力的均匀性,且对滤筒清灰效果有明显的改善作用。
?基于dea的我国“985”高校科技投入产出效率分析
符银丹,,
天津大学学报(社会科学版) , 2012,
Abstract: ?选取“985”高校投入指标创新基础能力、创新投入能力、环境支持能力、创新产出能力和成果转化能力,建立基于dea的高校科技投入产出效率评价模型。产出变量选取专著数量、国外及全国性刊物发表论文数、鉴定成果数、技术转让当年实际收入、国家级奖项等,应用该模型对我国37所“985工程”高校2008年的科技投入产出效率进行了比较。研究结果表明,37所“985工程”高校科技投入产出一部分处于dea有效率,一部分处于非dea有效率,非dea有效率其很大程度上是缘于规模无效率。规模不当已成为制约我国部分高校科技投入产出效率提高乃至可持续发展的症结所在,而要解决这一问题的关键在于妥当处理高校科技投入产出发展过程中所必须面临的技术提升与规模扩张之间的关系。?
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