Clinical prediction of insufficient vaults after implantable collamer lens implantation

AIM:To determine the factors related to preoperative ocular characters that are predictive of insufficient vault(<250μm)after implantable collamer lens(ICL V4c;STAAR Surgical)implantation.METHODS:The participants underwent ICL surgery and were divided into the low(<250μm)and normal(250-1000μm)vault groups based on the postoperative vault at 3mo.The preoperative biometric parameters and clinical outcomes were compared between the two groups.The relationship between the 3-month vault values and preoperative ocular parameters were evaluated by Generalized estimating equations.RESULTS:Sixteen(23 eyes)and 36 patients(63 eyes)were in the low and normal vault groups,respectively.All implantation procedures were uneventful with no cataract formation in the early postoperative period.The sulcusto-sulcus lens rise(STSL)and iris ciliary angle(ICA)were correlated with vault at 3mo after surgery.Every 0.1 mm increase in STSL was associated with 38.9μm decrease in the postoperative 3-month vault.A rise of 1 degree in ICA is associated with a reduction of 4μm in vault.CONCLUSION:Eyes with a narrow ciliary sulcus are associated with a higher rate of low vault after ICL implantation,suggesting a need for adjustments to the ICL size in these patients.Evaluating the characteristics of the ciliary sulcus contributes valuable information to predict low vault after surgery.

Biometric and ICL-related risk factors associated to sub-optimal vaults in eyes implanted with implantable collamer lenses

Background To identify biometric and implantable collamer lens(ICL)-related risk factors associated with sub-optimal postoperative vault in eyes implanted with phakic ICL.Methods This study reports a retrospective case series of the first operated eye in 360 patients implanted with myopic spherical or toric ICL.Preoperatively,white-to-white(WTW),central keratometry(Kc)and central corneal thickness(CCT)were measured using the Pentacam.Anterior-segment optical coherence tomography(AS-OCT,Visante)was applied preoperatively for measuring the horizontal anterior-chamber angle-to-angle distance(ATA),internal anterior chamber depth(ACD),crystalline lens rise(CLR),anterior-chamber angle(ACA)and postoperatively the vault.Eyes were divided into three vault groups:low(LVG:≤250μm),optimal(OVG:>250 and<1000μm)and high(HVG:≥1000μm).Multinomial logistic regression(MLR)was used to find the sub-optimal vault predictors.Results MLR showed that CLR,ICL size minus the ATA(ICL size-ATA),age,ICL spherical equivalent(ICLSE)and ICL size as contributing factors for sub-optimal vaults(pseudo-R2=0.40).Increased CLR(OR:1.01,CI:1.00–1.01)and less myopic ICLSE(OR:1.22,CI:1.07–1.40)were risk factors for low vaults.Larger ICL size-ATA(OR:41.29,CI:10.57–161.22)and the 13.7 mm ICL(OR:7.08,CI:3.16–15.89)were risk factors for high vaults,whereas less myopic ICLSE(OR:0.85,CI:0.76–0.95)and older age(OR:0.92,CI:0.88–0.98)were protective factors.Conclusion High CLR and low ICLSE were the major risk factors in eyes presenting low vaults.In the opposite direction,ICL size-ATA was the major contributor for high vaults.This relationship was more critical in higher myopic ICLSE,younger eyes and when 13.7 mm ICL were used.The findings show that factors influencing the vault have differentiated weight of influence depending on the type of vault(low,optimal or high).

基于管立得和Revit软件实现多专业协同BIM模型设计给水泵站的应用探索

以光明科学城大科学装置集群大科学装置集群给水加压泵站项目为例,通过BIM建模将鸿业管立得与Revit结合,并利用vault软件进行多专业协同设计,探索了多软件建模、协同设计提高建模及设计效率,可为类似工程提供借鉴。

一种免预对齐的指纹模板隐私加密方法

针对指纹模板明文存储所带来的隐私问题,设计了一种基于Fuzzy Vault改进的免对齐指纹模板加密方法。不同于基于特征点坐标的Fuzzy Vault加密方法,所提出的方法通过圆盘结构的设计,更多考虑了特征点间的空间关系。通过引入圆盘结构,可在解密阶段对特征点进行粗细两级筛选,以提高识别效率。实验结果表明,所提出的方法通过结合坐标方向信息与邻域空间关系提高了指纹识别的准确度,通过对特征点数据进行粗筛选,大幅减少了全局几何配准所需计算量。

Biometric and ICL-related risk factors associated to sub-optimal vaults in eyes implanted with implantable collamer lenses

Background:To identify biometric and implantable collamer lens(ICL)-related risk factors associated with suboptimal postoperative vault in eyes implanted with phakic ICL.Methods:This study reports a retrospective case series of the first operated eye in 360 patients implanted with myopic spherical or toric ICL.Preoperatively,white-to-white(WTW),central keratometry(Kc)and central corneal thickness(CCT)were measured using the Pentacam.Anterior-segment optical coherence tomography(AS-OCT,Visante)was applied preoperatively for measuring the horizontal anterior-chamber angle-to-angle distance(ATA),internal anterior chamber depth(ACD),crystalline lens rise(CLR),anterior-chamber angle(ACA)and postoperatively the vault.Eyes were divided into three vault groups:low(LVG:≤250μm),optimal(OVG:>250 and<1000μm)and high(HVG:≥1000μm).Multinomial logistic regression(MLR)was used to find the sub-optimal vault predictors.Results:MLR showed that CLR,ICL size minus the ATA(ICL size-ATA),age,ICL spherical equivalent(ICLSE)and ICL size as contributing factors for sub-optimal vaults(pseudo-R2=0.40).Increased CLR(OR:1.01,CI:1.00-1.01)and less myopic ICLSE(OR:1.22,CI:1.07-1.40)were risk factors for low vaults.Larger ICL size-ATA(OR:41.29,CI:10.57-161.22)and the 13.7mm ICL(OR:7.08,CI:3.16-15.89)were risk factors for high vaults,whereas less myopic ICLSE(OR:0.85,CI:0.76-0.95)and older age(OR:0.92,CI:0.88-0.98)were protective factors.Conclusion:High CLR and low ICLSE were the major risk factors in eyes presenting low vaults.In the opposite direction,ICL size-ATA was the major contributor for high vaults.This relationship was more critical in higher myopic ICLSE,younger eyes and when 13.7mm ICL were used.The findings show that factors influencing the vault have differentiated weight of influence depending on the type of vault(low,optimal or high).

Wind Pressure Distribution and Wind-induced Dynamic Response for Spatial Groined Latticed Vaults

The wind pressure distribution and wind-induced vibration responses of long-span spatial groined latticed vaults （SGLVs） were numerically simulated, which always are ones of the most important problems in the structural wind resistance design. Incompressible visco-fluid model was introduced, and the standard k - two equation model and semi-implicit method for pressure linked equation （SIMPLE） were used to describe the flow turbulence. Furthermore, the structural dynamic equation was set up, which is solved by Newmark-fl method. And several sort of wind-induced vibration coefficients such as the wind-induced vibration coefficient corresponding to the nodal displacement responses and wind loads were suggested. In the numerical simulation where the SGLV consisting of the cylindrical sectors with different curved surface was chosen as the example, the influence on the relative wind pressure distribution and structural wind-induced vibration responses of the closed or open SGLV caused by such parameters as the number of cylindrical sectors, structural curvature and the ratio of rise to span was investigated. Finally, some useful conclusions on the local wind pressure distribution on the structural surface and the wind-induced vibration coefficients of SGLV were developed.

Vault predicting after implantable collamer lens implantation using random forest network based on different features in ultrasound biomicroscopy images

AIM:To analyze ultrasound biomicroscopy(UBM)images using random forest network to find new features to make predictions about vault after implantable collamer lens(ICL)implantation.METHODS:A total of 450 UBM images were collected from the Lixiang Eye Hospital to provide the patient’s preoperative parameters as well as the vault of the ICL after implantation.The vault was set as the prediction target,and the input elements were mainly ciliary sulcus shape parameters,which included 6 angular parameters,2 area parameters,and 2 parameters,distance between ciliary sulci,and anterior chamber height.A random forest regression model was applied to predict the vault,with the number of base estimators(n_estimators)of 2000,the maximum tree depth(max_depth)of 17,the number of tree features(max_features)of Auto,and the random state(random_state)of 40.0.RESULTS:Among the parameters selected in this study,the distance between ciliary sulci had a greater importance proportion,reaching 52%before parameter optimization is performed,and other features had less influence,with an importance proportion of about 5%.The importance of the distance between the ciliary sulci increased to 53% after parameter optimization,and the importance of angle 3 and area 1 increased to 5% and 8%respectively,while the importance of the other parameters remained unchanged,and the distance between the ciliary sulci was considered the most important feature.Other features,although they accounted for a relatively small proportion,also had an impact on the vault prediction.After parameter optimization,the best prediction results were obtained,with a predicted mean value of 763.688μm and an actual mean value of 776.9304μm.The R²was 0.4456 and the root mean square error was 201.5166.CONCLUSION:A study based on UBM images using random forest network can be performed for prediction of the vault after ICL implantation and can provide some reference for ICL size selection.

Application of femtosecond laser in assisted cataract after ICL implantation with different vault

Dear Editor,We are writing this letter to report two unusual cases of femtosecond laser-assisted cataract surgery(FLACS)in two ICL-implanted patients with significant different vault.FLACS has been confirmed by accumulating evidence to improve the safety and precision of surgery from common cases to complicated cases in treating cataracts[1-3].Implantable collamer lens(ICL)implantation possesses a good performance in its predictability,reversibility,and the rapid visual recovery.

Bone Defect of the Cranial Vault: Difficulty of the Diagnostic about a Case, and Revew of Literature

The bone defects of the cranial vault encompassed rare malformations including acalvaria, hypocalvaria, acrania, hypocrania, anencephaly and exencephaly. They are also described in some pathological entities such as aplasia cutis congenita of the scalp. We report an unusual case of cephalic malformation which combine defects of the skin, the dura mater, and the bones of the vault, with a malformation of the central nervous system. This unique case emphasizes a problem of nosological definition between the terms mentioned above. acalvaria, the acrania, the hypocalvaria and the aplasia cutis congenita. Thus, herein, we proceed to a literature review of bone defects of the skull and their differential diagnosis.

改进的可撤销指纹Fuzzy Vault方案

Fuzzy Vault系统是生物特征加密(Biometric Encryption,BE)领域中广泛应用的密钥绑定框架,适用于集合特征(例如指纹细节点)与密钥的绑定.然而,Vault模板中包含了真实指纹细节点特征,攻击者可以从多个发布的Vault模板中获取真实指纹信息,因而严重威胁到用户的隐私和密钥安全.笔者提出一种改进的可撤销指纹Fuzzy Vault方案.首先,基于口令构造一个不可逆变换函数,应用该变换函数对细节点特征进行变换,然后使用变换后的细节点输入Fuzzy Vault系统.攻击者即使得到多个应用系统上的Vault也不能获得原始指纹细节点特征,且用户可以通过随时更换口令来发布新的Vault模板.在FVC2002 DB2上的实验表明,所提出的方案能有效降低交叉匹配带来的安全隐患,提高系统安全性.

基于指纹的可撤销Fuzzy vault方案

Fuzzy vault是一种用生物特征保护密钥的加密框架,其主要缺点在于攻击者可以通过交叉比较同一用户的不同vault来获得生物模板的准确信息,从而可以破解vault。提出了一种使用基于指纹细节点的可撤销的变换模板作为生成vault的模板,保护不同密钥时采用不同变换模板,从而解决了这个问题。采用以巴特沃斯低通滤波器为核的函数组作为生成可撤销模板的变换函数。此外还使用了用户口令加密vault,从而进一步增强了被保护密钥的安全性。

GRS解码在Fuzzy Vault中应用

将指纹细节点和密钥进行绑定,并用fuzzy vault方法对结果进行保护。在密钥恢复时,用GRS解码进行纠错处理。对GRS的传统解码和表单解码的效果进行了比较,实验表明表单解码比传统解码的密钥恢复效果更好。

基于Fuzzy Vault方案的指纹细节特征加密

指出了现有指纹Fuzzy Vault方法用于加密长度较短的密钥时安全性不足的问题,并基于Fuzzy Vault方案,提出了一种指纹细节特征加密方法。首先指定Fuzzy Vault编码多项式的幂次,并根据指定幂次对加密密钥进行处理和隐藏。通过这种处理,避开了现有方法中密钥长度决定Fuzzy Vault编码多项式幂次的弊端,解除了现有方法加密长度较短的密钥时所存在的安全隐患。

面向企业级数据中心的分布式ETL研究与设计

随着信息技术的不断发展与成熟,数据中心建设是值得我们探讨的课题。本文从大数据时代ETL所面临的挑战进行分析,提出解决问题的思路和措施,研究和设计了企业级数据中心的分布式ETL方案,并就ETL关键技术、Data Vault混合数据建模、异常处理及保障进行了探讨。

指纹Fuzzy Vault加密方案

本文基于Fuzzy Vault方案提出了一种使用指纹细节点对系统密钥进行加密的方法,该方法将指纹细节特征点与系统密钥很好地结合在一起,有效地解决了传统加密方法存在的不足。

基于B样条曲线的指纹Fuzzy Vault对齐方法

指纹设备采集到的指纹图像由于不能用统一的参照表示指纹细节点的坐标,因此,同一枚指纹分别在录入和注册时得到的指纹细节点需要对齐。本文采用指纹纹线作为指纹Fuzzy vault对齐的方法,在目标纹线上提取B样条控制点,用这些控制点数据与纹线的距离作为辅助数据来对齐指纹模板。研究分析表明这种方法不会泄露指纹细节点的任何信息。实验结果证明,这种方法具有很好的实时性并能提高指纹Fuzzy vault的配准率。

提升设计能力的唯一选择

用Autodesk Inventor取代AutoCAD软件进行真空泵工程项目的设计,并用Autodesk Vault进行图纸资料的管理,这一选择彻底改变了令人沮丧的设计和数据管理现状。

生物特征加密技术研究现状与解决方案

随着信息技术的快速发展,传统加密方法由于口令难以记忆以及容易被破解,而存在被攻击的潜在威胁;生物特征加密技术由于其将密钥和个体生物特征相互绑定而更为安全便捷.对生物特征加密技术的国内外研究现状进行了概述,重点介绍了两种经典的生物特征加密技术解决方案,并分析指出了各自的不足之处.

Design between Architecture and Structure: Case Studies of Pilot Interventions on Italian Monumental Buildings

Two case studies,referring to historic Italian buildings housing city halls,provide an opportunity to investigate the design of non-standard elements aimed at protecting masonry vaults,with particular reference to the preliminary works prior to the actual structural restoration work.There is in fact a phase in which it is a priority to secure the vault to avert possible risks to the users of that portion of the building.This phase is temporarily intermediate between the detection and aggravation of injuries and the renovation and consolidation project.Although these are provisional works,they are intended for buildings that are often public and therefore intended for a wide range of users,such as schools,offices or monumental buildings.In analyzing traditional techniques and systems used in similar cases,the possibility of developing evolutionary aspects with respect to,above all,simple shoring techniques emerged.In these areas,hybrids between a structural and architectural project,it is possible to reconcile static requirements with architectural techniques of space management,attentive to the quality of the interior and the integration of the provisional work with the reference context.

一种基于BioHashing和洗牌算法的可撤销密钥绑定方案

针对传统加密方案中密钥管理困难的问题,提出了一个新的通过指纹管理密钥的密钥绑定方案。该方案通过BioHashing方法得到用户指纹特征的二进制序列,对得到的序列执行一个改进的洗牌算法进行置乱,最后通过Fuzzy Vault方案将特征值与密钥进行绑定。仿真分析表明,利用Fuzzy Vault方案的容错机制和BCH码的纠错机制,该方案可以在保证指纹信息安全的情况下正确恢复密钥。同时,改进的洗牌算法实现了特征模板的可撤销性和不可逆性。