Non-contact wide-field viewing system-assisted scleral buckling surgery for retinal detachment in silicone oilfilled eyes

AIM:To evaluate scleral buckling(SB)surgery using a noncontact wide-field viewing system and 23-gauge intraocular illumination for the treatment of rhegmatogenous retinal detachment in silicone oil(SO)-filled eyes.METHODS:Totally 9 patients(9 eyes)with retinal detachment in SO-filled eyes were retrospectively analyzed.All patients underwent non-contact wide-field viewing system-assisted buckling surgery with 23-gauge intraocular illumination.SO was removed at an appropriate time based on recovery.The patients were followed up for at least 3mo after SO removal.Retinal reattachment,complications,visual acuity and intraocular pressure(IOP)before and after surgery were observed.RESULTS:Patients were followed up for a mean of 8.22mo(3-22mo)after SO removal.All patients had retinal reattachment.At the final follow-up,visual acuity showed improvement for 8 patients,and no change for 1 patient.The IOP was high in 3 patients before surgery,but it stabilized after treatment;it was not affected in the other patients.None of the patients had infections,hemorrhage,anterior ischemia,or any other complication.CONCLUSION:This new non-contact wide-field viewing system-assisted SB surgery with 23-gauge intraocular illumination is effective and safe for retinal detachment in SO-filled eyes.

Comparison of scleral buckling using wide-angle viewing systems and indirect ophthalmoscope for rhegmatogenous retinal detachment

AIM：To compare the effects of scleral buckling using wide-angle viewing systems（WAVS） with that using indirect ophthalmoscope for the treatment of rhegmatogenous retinal detachment.METHODS：The study was a retrospective analyses of the medical records of 94 eyes（94 patients） with rhegmatogenous retinal detachment.Among them,47 eyes underwent scleral buckling using WAVS with endoiiluminator（Group W）,and 47 eyes underwent scleral buckling using indirect ophthalmoscope（Group I）.Surgical durations,primary success rate,best-corrected visual acuities（BCVA）,delayed subretinal fluid absorptions and surgical complications were compared between the two groups.RESULTS：At baseline,there were no statistical differences between the two groups in patient＇s age（P=0.997）,gender（P=0.853）,symptom duration（P=0.216）,BCVA（P=0.389）,refractive error（P=0.167）,intraocular pressure（P=0.595）,the number of retinal breaks（P=0.832）,the extent of retinal detachment（P =0.246）,subretinal demarcation line（P=0.801）,and macular detachment（P=0.811）.The follow-up period was 12 mo.The surgical durations in Group W（with or without encircling buckling） were significant shorter than those in Group I（P〈0.001 respectively）.The primary success rate was94.27%in Group W,which was similar to that in Group I（92.38%,P=0.931）.The BCVA in Group W was better than that in Group I（P〈0.001） at 1-month follow-up visit.However,there were no significant differences between the two groups at 3-month（P=0.221）,6-month（P =0.674）,and 12-month（P=0.363） follow-up visits respectively.Delayed subretinal fluid absorptions were more common in Group I than in Group W at 1-month（P=0.045） follow-up visit,but there were no significant differences between the two groups at 3-month（P=0.111）,6-month（P =1.000） and 12-month follow-up visits respectively.CONCLUSION：Scleral buckling using WAVS can be an alternative choose for rhegmatogenous retinal detachment

Preventing condensation of objective lens in noncontact wide-angle viewing systems during vitrectomy

AIM： To assess the optimal conditions for preventing condensation of objective lens during vitrectomy with noncontact wide-angle viewing systems（WAVSs）. METHODS： We explored the effectiveness of the coating with ophthalmic viscoelastic device（OVDs） on the corneal surface and the soaking the objective lens in warm-saline for preventing condensation of objective lens. First, to find the optimal soaking time to keep the objective lens warm, we measured the temperature of objective lens every minute after soaking in warm saline. Second, to find optimal distance between cornea and objective lens, which provide as wide a view as possible and less condensation at the same time, we measured the condensation time with different distances. With the obtained optimal soaking time and distance, we explored the effect of coating cornea with OVDs and soaking objective lens in warm saline on condensation time.RESULTS： One and 5 min of soaking in warm saline was most effective for keeping the lens warm enough（45.1℃±2.1℃ for 1 min and 46.4℃±1.0℃ for 5 min, P=0.109）. The mean condensation times for the control group at 1, 3, and 5 mm from corneal surface to objective lens were 1±0.4, 4±1.4, 190±26.1 s, respectively, thus 5 mm was most optimal distance for vitrectomy with WAVSs. For the OVD coating group, the mean condensation times were 1.5±0.3, 13±1.4, and 200±23.9 s at 1, 3, and 5 mm distance and borderline significant compared with control group（P=0.068, 0.051, and 0.063, respectively）. With the 1-minute warm saline soaking group, the mean condensation time were extended to 188±34.4, 416±65.7, and 600±121.3 s at 1, 3, and 5 mm distance and statistically significant compared with control（P=0.043, 0.041 and 0.043, respectively）.CONCLUSION： OVD coating on corneal surface shows no difference on condensation time with control group. However, soaking the objective lens in warm saline revealed statistically significant extension of condensation time compared to control group. Therefore, keeping the objective lens warm with soaking in warm saline is a simple but effective to prevent condensation of objective lens during vitrectomy. The thermodynamics between objective lens and cornea during vitrectomy warrants further investigation.

Research on Feature Matching Optimization Algorithm for Automotive Panoramic Surround View System

In response to the challenges posed by insufficient real-time performance and suboptimal matching accuracy of traditional feature matching algorithms within automotive panoramic surround view systems,this paper has proposed a high-performance dimension reduction parallel matching algorithm that integrates Principal Component Analysis(PCA)and Dual-Heap Filtering(DHF).The algorithm employs PCA to map the feature points into the lower-dimensional space and employs the square of Euclidean distance for feature matching,which significantly reduces computational complexity.To ensure the accuracy of feature matching,the algorithm utilizes Dual-Heap Filtering to filter and refine matched point pairs.To further enhance matching speed and make optimal use of computational resources,the algorithm introduces a multi-core parallel matching strategy,greatly elevating the efficiency of feature matching.Compared to Scale-Invariant Feature Transform(SIFT)and Speeded Up Robust Features(SURF),the proposed algorithm reduces matching time by 77%to 80%and concurrently enhances matching accuracy by 5%to 15%.Experimental results demonstrate that the proposed algorithmexhibits outstanding real-time matching performance and accuracy,effectivelymeeting the feature-matching requirements of automotive panoramic surround view systems.

探究新课标下高中英语读思课中Viewing技能与学科素养的融合策略

本文率先介绍了Viewing渗透下高中英语阅读中的核心素养,再精准找出Viewing在高中英语读思课中的运用模块,然后全面探究出阅读思维和Viewing技能融合的有效策略,内容包含搭建多模态互动场景、丰富语言教学活动、科学运用思维导图及拓展英语阅读资源等,更好地培养学生的学习能力、语言能力、思维品质、文化意识与知识扩展能力,增强学生英语阅读综合素质。

Analysis of Viewing Paintings from the Perspective of Iconography

Distinguished from purely formalistic research methods,iconography pursues the interpretation of the hidden historical and humanistic connotations behind artworks,and is a discipline that combines visual text and content analysis methods.Combining the three stages of iconography proposed by Panofsky,the paper studies Shizeng Chen’s Viewing Paintings from the perspective of iconography,summarizing the formation and change of the images and contents of the artworks in the cultural system and civilization at that time,as well as their implied ideology,and analyzing the hidden spirit of the times and the historical significance behind them,so as to expound their iconographic significance.Through an in-depth discussion at three levels:pre-pictorial iconographic description,iconographic analysis,and iconographic interpretation,the facts and surface contents reproduced in the images,the traditional level of literary,artistic,and cultural knowledge,as well as the interpretation of the potential meanings are revealed.

基于SystemView的AM通信系统仿真设计

利用System View实现了AM通信系统。在发送端,产生了临界调幅的AM信号,信道考虑了加性高斯白噪声信道,接收端采用相干解调器解调。利用Sink库显示模块显示了AM系统中的标志性波形,并利用System View的分析功能求出各标志性信号的频谱并予以显示。实验表明,System View非常适合通信原理课程实验。

基于System View的通信系统仿真

介绍了通信系统仿真和仿真专用工具 System View,分析了 CNI (Communication、Navigation &Identification System)系统中最小频移健控 (MSK)调制方式 ,并用 System View工具仿真了 MSK调制 /解调过程 。

MATLAB和System View在通信原理实验中的应用

以二进制频移键控(2FSK)调制为例,针对仿真软件System View和MATLAB在通信原理实验教学中的应用进行了研究,给出了仿真电路和仿真波形图,同时进行了讨论。

System View用于通信原理实验课教学的研究

以分析线性模拟调制中调幅指数β与波形失真的关系为例,针对仿真软件System View在通信原理实验教学中的应用进行了研究。给出了仿真电路和仿真波形图,同时结合应用问题进行了相关的讨论。

SystemView和MATLAB在通信原理课程中的应用比较

MatlaB和SystemView软件在通信专业课程中的应用越来越多,也在通信行业得到了广泛的应用。通过分析两种软件的特点,并以通信原理课程中的重要内容PCM原理为例子分别使用Matlab和SystemView对其进行仿真,以说明这两种软件在通信仿真过程中的侧重点和思路的不同。

基于System View软件的《通信原理》教学研究与探讨

针对System View软件的特点,提出将该软件应用于理论教学中.结合《通信原理》教学难点:PCM编码调制,验证该软件在教学中的应用情况.结果表明:System View软件可完整、准确地完成从模拟信号到数字信号的转化,并以可视化波形显示,有助于学生理解并掌握理论知识,进一步提高教学质量.

System View软件在“移动通信”课程教学中的应用

针对高校“移动通信”课程教学中存在的教学脱离实际、学生参与不积极等问题,提出一种将System View软件应用于理论教学中的教学方法。该方法主要以System View软件辅助理论教学,通过与硬件实验相结合,提升课程质量。首先在System View软件中设计“移动通信”理论原理图,运行程序后分组讨论相关参数,最后将软件运行结果与硬件实验结果进行对比,启发学生思考问题。调查结果表明:对该教学方法认可满意的学生比例为86%,较满意的为9.2%,不满意的为4.8%。“移动通信”的理论教学实验表明该方法有效可行,能提高学习自主性,并能有效提高教学质量。

基于SystemView的引信用GPS弹道敏感器仿真

介绍了引信用GPS弹道敏感器的工作原理和SystemView的应用,并使用SystemView建立了引信用GPS弹道敏感器的仿真系统,得到了不同噪声条件下的仿真结果。通过建立仿真模型可以在系统设计中针对不同的方案对系统参数进行调整,提高设计效率。

应用System View仿真软件进行《通信原理》课程的辅助教学

针对《通信原理》课堂教学理论性强的特点,提出利用System View软件平台来进行辅助教学,以加强课本理论知识的理解和实践补充.通过该软件平台对课程所涉及的复杂理论和系统设计方面进行形象、直观的演示,培养学生的系统设计和实践能力,并以MSK为例说明了该软件平台的使用.实践教学中取得了较好的应用效果,也对类似的课程教学具有借鉴意义.

基于System View的串行MSK调制与解调的仿真研究

MSK作为一种性能优良的调制方式,被广泛应用于卫星通信和无线移动通信中的数据传输。串行MSK调制多用于数据速率较高的场合,在工程实现上有着较为广泛的应用。简要分析了基于带通滤波器和基于低通滤波器的两种MSK串行调制与解调方式,利用通信系统仿真软件System View,对两种调制与解调方式进行了仿真,给出了详细的仿真电路,并通过仿真分析了不同干扰条件下的抗干扰性能。

Estimation of IFOV of Rosette Scan System

The methods of estimating the minimum allowed value of IFOV (instantaneous field of view) of the detector in a rosette scan system are investigated. The common method for the estimation of IFOV is described. A new method which uses the maximum distance between two neighboring petals as the estimated value of IFOV is developed and a comparison between the common method and the new method is given. It is concluded that the minimum allowed value of IFOV of rosette scanning is over estimated by the common method while this value can be calculated accurately with the new method.

System View与MATLAB数据通信的研究

在很多应用场合,需要在SystemView与MATLAB之间进行数据通信。本文提出了一种以M-LINK为桥梁的通信方式,并给出了具体操作步骤。为了验证通信方式的可行性,以PCM为例,探讨如何通过M-LINK模块进行两种软件的数据通信,实现通信系统联合仿真。仿真结果表明,本文提出的通信方式是可行的。

SystemView与VC混合编程在通信仿真中的应用

利用 System View中自定义模块的功能 ,可实现复杂或专用的算法功能。分析了该功能的生成及调用方法 ,结合 VC+ + 6 .0设计了一个抑制载波调幅的实例 ,可作为用户编制自定义模块的参考。

System View在《高频电子电路》课程教学中的应用

《高频电子电路》基本内容属于非线性电子电路,在电子信息、通信工程等专业的学习过程中是学生感到比较难学的一门重要基础课程。如果利用SystemView仿真软件建立幅度调制和解调、频率调制与解调等高频电子电路主要系统,直观生动地演示该课程重点和难点内容,能使学生印象深刻、易于理解。SystemView仿真软件应用受到了学生的普遍欢迎,亦极大地提高了他们的学习兴趣。取得了较好的教学实践效果。