我国产业学院研究的知识图谱——基于KH Coder的文献计量分析

为探究我国产业学院研究的发展脉络,以CNKI数据库中2005—2023年有关“产业学院”的核心期刊论文为数据源,采用文本数据挖掘软件KH Coder,从文献的外部特征及内部特征两个维度,系统分析我国产业学院研究的发展脉络和热点主题。研究表明:我国“产业学院”研究越来越受到学界重视,研究热度逐年增强;发文作者与合作机构的联络有待进一步加强;热点主题包含“产业学院”“人才培养”“治理”“校企合作”等十个热点主题。

网红图书馆用户体验分析及提升策略——基于KH Coder的用户评价文本挖掘

随着新馆建设和空间改造,越来越多的图书馆成为网红。为了分析网红图书馆的用户体验,采集大众点评网上天津市“滨海新区图书馆”词条下的用户点评文本,借助ROST EA软件进行情感分析,运用KH Coder软件进行词频、共现、主题和差评问题分析。研究发现:大多数用户对网红图书馆持正面情感,其关注焦点集中于拍照打卡、馆藏图书、阅读环境、地理位置、管理制度、人员服务和儿童进馆等方面;点评主题有6个,分别是地址及开馆事项、拍照感受体验、设计造型特色、读书环境评价、休闲观光功能和入馆相关事宜等;差评抱怨主要集中于6个方面,包括氛围、馆藏、环境、排队安检、管理制度和工作人员等。提出若干用户体验提升策略,如注重品牌营销、丰富建设内涵、增强人文关怀精神等。

Electro-optical properties cholesteric liquid of polymer stabilized crystal film＊

Liquid crystals （LCs） and polymers are extensively used in various electro-optical applications. In this paper, normal mode polymer stabilized cholesteric LC film is prepared and studied. The effects of chiral dopant and monomer concentrations on the electro-optical properties, such as contrast ratio, driving voltage, hysteresis width and response time, are investigated. The reasons of electro-optical properties influenced by the concentrations of the materials are discussed. Through the proper material recipe, the electro-optical properties of polymer stabilized cholesteric LC film can be optimized.

Experimental study of electro-optical-switched pulsed Nd:YAG laser

We report the specification of a compact and stable side diode-pumped Q-switched pulsed Nd：YAG laser. We ex- perimentally study and compare the performance of the pulsed Nd：YAG laser in the free-running and Q-switched modes at different pulse repetition rates from 1 Hz to 100 Hz. The laser output energy is stabilized by using a special configu- ration of the optical resonator. In this laser, an unsymmetrical concave-concave resonator is used and this structure helps the mode volume to be nearly fixed when the pulse repetition rate is increased. According to the experimental results in the Q-switched operation, the laser output energy is nearly constant around 70 mJ with an FWHM pulse width of 7 ns at 100 Hz. The optical-to-optical conversion efficiency in the Q-switched regime is 17.5%.

Electro-Optical Properties of Carbon Nanotubes Obtained by High Density Plasma Chemical Vapor Deposition

In this work, we studied the electro-optical properties of high-aligned carbon nanotubes deposited at room temperature. For this, we used the High Density Plasma Chemical Vapor Deposition system. This system uses a new concept of plasma generation: a planar coil is coupled to an RF system for plasma generation. This was used together with an electrostatic shield, for plasma densification, thereby obtaining high-density plasmas. The carbon nanotubes were deposited using pure methane plasmas. Three methods were used for the surface modification of the sample: reference substrate (silicon wafer only submitted to a chemical cleaning), silicon wafer with surface roughness generated by plasma etching, silicon wafer with a thin iron film and silicon wafer with diamond nano powder used as precursor materials. For each kind of silicon wafer surface, the carbon nanotubes were deposited with two different deposition times (two and three hours). The carbon nanotubes structural characteristics were analyzed by Atomic Force Microscope and Scanning Electronic Microscope. The carbon nanotubes electrical characteristics were observed by Raman Spectroscopy and the carbon nanotubes electro-optical properties were analyzed by current vs voltage electrical measurements and photo-luminescence spectroscopy measurements. The photoelectric effect in the carbon nanotubes were determined by photo-induced current measurements. In this work, we obtained carbon nanotubes with semiconductor properties and carbon nanotubes with metallic properties. The electro-optical effects depend strongly on the substrate preparation and the deposition parameters of the carbon nanotubes. The carbon nanotubes are high aligned and show singular properties that can be used for many applications.

Electro-optical properties of high birefringence liquid crystal compounds with isothiocyanate and naphthyl group

Liquid crystal（LC） compound with isothiocyanate and naphthyl group is an attractive high birefringence LC material,and can be used in optical devices. In this paper, the electro-optical properties of a series of this type of LC compounds were investigated. The melting points and enthalpy values of these LC compounds were higher than those of corresponding compounds with the phenyl group. These compounds exhibited high birefringence with a maximum value of 0.66. Fluorine substitution in the molecular almost does not affect the birefringence value. When these LC compounds with the naphthyl group were dissolved in a commercial LC mixture, the electro-optical properties depending on temperature were investigated. In the low-temperature region, LC mixtures with the naphthyl-group LC compounds exhibited higher viscosity than pure commercial LCs. In the high-temperature region, viscosity values very closely approached each other. When response performance was investigated, figure-of-merit（FoM） values were measured. The Fo M values of LC mixtures containing LC compounds with naphthyl group were lower than those of reference benzene LCs in the low-temperature region. However, in the high-temperature region, the results were reversed. These isothiocyanate LC compounds with naphthyl group can be applied in special fast-response LC device, particularly the ones used under high-temperature conditions.

Preparation and Microstructural,Structural,Optical and Electro-Optical Properties of La Doped Pmn-Pt Transparent Ceramics

Transparent relaxor ferroelectric ceramics of the system lanthanum modified lead magnesium niobate have been investigated for a variety of electro-optic properties could make these materials alternatives to (Pb,La)(Zr,Ti)O3. However, a study that relates the properties in function stoichiometric formula, it has not been analyzed heretofore. Therefore, in this work the effect of A-site substitution of La+3 in the characterization microstructural, structural, optical and electro-optical on (1-x)[Pb(1-3/2y)Lay(Mg1/3Nb2/3)O3]-xPbTiO3 and (1-z)[(1-x)Pb(Mg1/3Nb2/3)O3+xPbTiO3]+zLa2O3 has been performed. It was observed that the properties according to the stoichiometric formula and the PT had a maximum whose behavior was related to the addition of lanthanum in each stoichiometries.

Electro-optical dual modulation on resistive switching behavior in BaTiO3/BiFeO3/TiO2 heterojunction

The novel BaTiO3/BiFeO3/TiO2 multilayer heterojunction is prepared on a fluorine-doped tinoxide(FTO) substrate by the sol–gel method. The results indicate that the Pt/Ba TiO3/BiFeO3/TiO2/FTO heterojunction exhibits stable bipolar resistive switching characteristic, good retention performance, and reversal characteristic. Under different pulse voltages and light fields, four stable resistance states can also be realized. The analysis shows that the main conduction mechanism of the resistive switching characteristic of the heterojunction is space charge limited current(SCLC) effect. After the comprehensive analysis of the band diagram and the P–E ferroelectric property of the multilayer heterojunction, we can deduce that the SCLC is formed by the effect of the oxygen vacancy which is controlled by ferroelectric polarizationmodulated change of interfacial barrier. And the effective photo-generated carrier also plays a regulatory role in resistance state(RS), which is formed by the double ferroelectric layer Ba TiO3/BiFeO3 under different light fields. This research is of potential application values for developing the multi-state non-volatile resistance random access memory(RRAM) devices based on ferroelectric materials.

Electro-optical properties and(E,F) phase diagram of fluorinated chiral smectic liquid crystals

Fluorinated smectic liquid crystals each with a biphenyl benzoate rigid core are investigated. Molecular structures of the studied compounds have difference only in fluorine position and the length of the carbon chain. Dielectric relaxation study and electro-optical measurements are carried out with the classical SSFLC geometry. The field-induced phase transitions are studied and the（E,T） phase diagram is established.

Analysis of electro-optical intensity modulator for bunch arrival-time monitor at SXFEL

A bunch arrival-time monitor(BAM) based on an electro-optical intensity modulation scheme is currently under development at Shanghai Soft X-ray Free-Electron Laser to meet the high-resolution requirements for bunch stability. The BAM uses a radio frequency signal generated by a pickup cavity to modulate the reference laser pulses in an electro-optical intensity modulator(EOM), and the bunch arrival-time information is derived from the amplitude change of the laser pulse after laser pulse modulation.EOM is a key optical component in the BAM system.Through the basic principle analysis of BAM, many parameters of the EOM are observed to affect the measurement resolution of the BAM system. Therefore, a systematic analysis of the EOM is crucial. In this paper, we present two schemes to compare and analyze an EOM and provide a reference for selecting a new version of the EOM.

基于KH Coder文本数据挖掘中日农业经济发展特点对比

使用文本数据挖掘软件KH Coder,聚焦中日两国农业经济的研究论文,分析高频词与主题词共现关系网络,探讨两国农业经济的特点及异同。研究发现,日本的农业经济生产发展不仅注重产量,还注重农产品质量,政府扶持鼓励当地龙头企业发展,非常注重与地方特色相结合;我国农业经济生产发展特点是注重以科技推动农业现代化发展,关注产量,对于农产品质量的关注程度较低,对经济市场、农业组织的利用不足,需促进农业绿色可持续发展。

网络新媒体视阈下客家议题在日传播特征分析——基于日本Google News的考察

以日本Google News中的客家相关日文报道为语料,通过文本挖掘工具KH Coder进行文本数据挖掘,发现日本网络新闻媒体的客家议题日文报道具有分布零散性及以图片报道为主的特点。报道关注的客家区域主要涉及台湾地区、福建、香港地区、广东等地,其中,台湾地区的客家关注度最高。报道聚焦客家的观光旅游、产业振兴、客家书籍出版等相关内容,形成了客家传统建筑类、台湾地区客家文化交流类、客家文学作品推介类、客家观光旅游类等四大主要议题。本文提出要充分运用Google News等网络新媒体强大的技术功能和传播优势加大客家文化的传播力度。

某专科医院DRGs结算模式下未入组病例分析及改进措施

目的分析某专科医院在疾病诊断相关组(diagnosis related groups,DRGs)结算模式下存在的未入组病例问题,并提出相应的改进措施。方法通过回顾性分析和专家讨论,选取并总结某专科医院2021年1月—2022年6月上传至市医保平台病例信息管理系统中病例33935例中未入组病例300例,并对所有的未入组病例进行深入分析。结果未入组病例原因主要为主要诊断编码或者手术编码为灰码、医保版本切换导致原本入组的有效主诊断变成无效主诊断、主要诊断编码国家临床版医保版没有做好对照和临床医师主要诊断选择错误等方面。结论通过对医院DRGs结算模式下未入组病例的全面分析,找到改进措施,不断加强对临床医师和编码员的培训、加强病案首页质控、加强信息系统建设,从而提高DRGs入组率。

基于KH Coder文本数据挖掘的中日STEM教育研究模式对比

STEM教育由于强调跨学科融合和创新人才培养的理念而受到世界各国的广泛关注。我国学者的国际视野主要集中于欧美国家,而对日本的STEM教育研究甚少。造成这一现象的主要原因在于当前主流文献数据库并不支持对日语文献的检索,因此有必要借助KH Coder这一支持日语文献分析的文本数据挖掘软件来探索日本STEM教育研究的特色,以期为我国的STEM教育研究提供借鉴。通过对中日两国STEM教育研究主题高频词表与主题词共现关系网络的分析发现,日本的STEM教育研究更偏向于实践,且注重进行实证研究;实践指向下的开发主要关注教材开发,且非常注重与地方特色产业相结合;同时倡导和重视国际间合作开展STEM实践,不断输出和引进可贵经验。反观我国的STEM教育研究,则偏向于介绍国外特别是美国的STEM教育经验,课程内容偏向于STEM教育的理念及其设计等理论层面问题,非常缺乏融入本地境脉的实践和实证研究。为了更好地推进我国STEM教育的实践发展,我国学者应该借鉴日本STEM教育研究模式的特色,从实践与实证相结合、建立国际合作、融入地方境脉三方面探求STEM教育研究模式的转变。

Design optimization of a hexapod vibration isolation system for electro-optical payload

The electro-optical payloads on mobile platforms generally suffer undesirable vibrations generated by maneuvers and turbulence.These vibrations are in six degrees of freedom and cause line-of-sight jitters,resulting in image blurring and loss of tracking accuracy.In this paper,a Hexapod Vibration Isolation System(HVIS)is proposed and optimized to solve this problem.The optimization aims to centralize and minimize the natural frequencies of HVIS,for expanding the vibration isolation bandwidth and improving the vibration isolation in the higher frequency band.Considering that the design space for HVIS is limited and interfered with the frames of the mobile platform,a non-collision algorithm is proposed and applied in the optimization to obtain the feasible optimal design.The optimization result shows that the natural frequency bandwidth has been reduced by 42.9%,and the maximum natural frequency is reduced by 30.2%.The prototypes of initial and optimal designs are manufactured and tested.Both simulated and experimental results demonstrate the validity of the optimization,and the optimal design provides a maximum of 15 dB more isolation in rotation direction than the initial design.

Matlab Coder生成C代码的研究与应用

借助Matlab Coder可以缩短软件开发从方案到实现的时间,加速软件开发。本文提出一种方法:利用Matlab 2012a的Matlab Coder代码生成工具箱,将Matlab经典图像处理代码转换成高效、可移植的C代码静态库文件,成功移植到ARM9开发系统下运行。对比实验表明,用本文提出的方法生成的软件代码,在嵌入式目标系统中运行状况良好,其易维护性和执行效率等方面也优于手工编写的代码,实现了嵌入式系统软件代码的快速生成。

CodeRed.F会引起WIN2000服务器WEB服务中止

CodeRed.F病毒的发现是由于最近这段时间，我们单位的几台用win2000作服务器的内部网站web服务总是无故中断，且中断时间一般在上午上下班和下午上下班的时间，而装了win2003的服务器则不受影响。而在此之前，这些服务器已经服务了一年了，说明本身网站的设计是正常的，错误应出在别的地方。

基于梯度范数的暂态稳定评估模型的不平衡修正方法

为了解决电力系统中样本数量和质量不平衡造成的暂态稳定评估偏差问题,从评估模型的训练过程出发,通过预训练模型获得样本对模型参数修正的梯度范数,引入梯度范数均值比量化样本的不平衡程度,相较于先验信息,梯度范数均值比综合考虑了样本数量与样本质量的不平衡,并提出基于代价敏感法的不平衡修正方法,利用该方法改善模型的评估倾向性,以实现较好的修正效果。IEEE39节点系统和华东电网系统的仿真结果验证了所提方法的有效性。

Simulink PLC Coder在贝加莱运动控制系统中的应用

用MATLAB/Simulink对转速电流双闭环直流调速系统进行仿真调试,并通过Simulink PLC Coder自动生成C代码,集成至贝加莱PCC编程软件Automation Studio。贝加莱PCC执行C代码,转速电流双闭环直流调速系统便可在贝加莱运动控制系统上运行。

利用HDL Coder完成红外探测器图像死点的替换

利用HDL Coder工具从基于simulink模块的设计中生成可综合的硬件描述语言,并用FPGA实现红外探测器图像数据流的死点替换。以非致冷红外探测器成像系统中的死点替换为例,阐述了这一开发流程。将开发的关注点从HDL代码的底层编写转移到系统构架算法和仿真等更高级别的设计上来,提高了开发效率,并且取得了很好的图像处理效果。