SAR regional all-azimuth observation orbit design for target 3D reconstruction

Three-dimensional(3D) synthetic aperture radar(SAR)extends the conventional 2D images into 3D features by several acquisitions in different aspects. Compared with 3D techniques via multiple observations in elevation, e.g. SAR interferometry(InSAR) and SAR tomography(TomoSAR), holographic SAR can retrieve 3D structure by observations in azimuth. This paper focuses on designing a novel type of orbit to achieve SAR regional all-azimuth observation(AAO) for embedded targets detection and holographic 3D reconstruction. The ground tracks of the AAO orbit separate the earth surface into grids. Target in these grids can be accessed with an azimuth angle span of360°, which is similar to the flight path of airborne circular SAR(CSAR). Inspired from the successive coverage orbits of optical sensors, several optimizations are made in the proposed method to ensure favorable grazing angles, the performance of 3D reconstruction, and long-term supervision for SAR sensors. Simulation experiments show the regional AAO can be completed within five hours. In addition, a second AAO of the same area can be duplicated in two days. Finally, an airborne SAR data process result is presented to illustrate the significance of AAO in 3D reconstruction.

Design Method for Road Reconstruction and Expansion

This article analyzes the method for designing routes in road reconstruction and expansion projects,using an actual engineering project as an example.This includes an overview of a specific road reconstruction and expansion project,an analysis of the preexisting road,the basic principles of the design road project,and an analysis of the design methods and steps.This study aims to offer some guidance for road reconstruction and expansion design.

Analysis of Roadbed Pavement Designs for Highway Reconstruction and Upgrading

This paper focuses on the route and roadbed pavement design in highway reconstruction and upgrading projects.It discusses the importance of project design for highway reconstruction and upgrading,highlighting key aspects of route design and roadbed pavement design.The analysis reveals that the main design considerations in these projects include controlling factors of route reconstruction,expansion,and upgrading,as well as route plan design and longitudinal section design combined with roadbed pavement.In roadbed pavement design,it is crucial for designers to thoroughly collect existing data and make reasonable use of the current roadbed and pavement to develop a comprehensive design scheme.This analysis aims to provide a reference for the reasonable design of such projects.

Keystone design perforator island flap in facial defect reconstruction

Facial defect coverage is a common subject in the field of reconstructive surgery.There are many methods for facial defect reconstruction,and reconstructive surgeons should choose the most appropriate method on a case-by-case basis to achieve both functional and aesthetic improvement.Among various options for facial reconstruction,the local flap technique is considered the best reconstructive modality to provide good tissue matches of color and texture,which is consistent with the ideal goal of reconstruction(replacement of like-with-like).Keystone design perforator island flap(KDPIF),devised by Behan in 2003,has been applied to various fields of reconstructive surgery in the past decade due to its design simplicity,robust vascular supply,and reproducibility.Several studies have reported KDPIF reconstruction of facial defects,such as large parotid defects,small-to-moderate nasal defects,and eyelid defects.However,KDPIF has been used relatively less in facial defects than in other body regions,such as the trunk and extremities.The purpose of this review is to provide an organized overview of facial KDPIF reconstruction including the classification of KDPIF,modifications,physiology,mechanism of flap movement,consideration of facial relaxed skin tension lines and aesthetics,surgical techniques,clinical applications,and precautions for successful execution of KDPIF reconstruction.

Fault reconstruction observer design for continuous-time systems with measurement disturbances via descriptor system approach

This paper addresses a problem of observer-based sensor fault reconstruction for continuous-time systems subject to sensor faults and measurement disturbances via a descriptor system approach. An augmented descriptor plant is first formulated, by assembling measurement disturbances and sensor faults into an auxiliary state vector. Then a novel descriptor state observer for the augmented plant is constructed such that simultaneous reconstruction of original system states, sensor faults and measurement disturbances are obtained readily. Sufficient conditions for the existence of the proposed observer are explicitly provided, and the application scope of the observer is further discussed. In addition, an extension of the proposed linear approach to a class of nonlinear systems with Lipschitz constraints is investigated. Finally, two numerical examples are simulated to illustrate the effectiveness of the proposed fault-reconstructing approaches.

A Blade Altering Toolbox for Automating Rotor Design Optimization

The Blade Altering Toolbox(BAT)described in this paper is a tool designed for fast reconstruction of an altered blade geometry for design optimization purposes.The BAT algorithm is capable of twisting a given rotor’s angle of attack and stretching the chord length along the span of the rotor.Several test cases were run using the BAT’s algorithm.The BAT code’s twisting,stretching,and mesh reconstruction capabilities proved to be able to handle reasonably large geometric alterations to a provided input rotor geometry.The test examples showed that the toolbox’s algorithm could handle any stretching of the blade’s chord as long as the blade remained within the original bounds of the unaltered mesh.The algorithm appears to fail when the net twist angle applied the geometry exceeds approximately 30 degrees,however this limitation is dependent on the initial geometry and other input parameters.Overall,the algorithm is a very powerful tool for automating a design optimization procedure.

Reconstruction and paradigm of the thinking mode of environmental art design

Environmental art design covers almost all contemporary art and design, and is a comprehensive system of art and design.Therefore, the image of thinking dominated, integrated design thinking is the main feature of the environmental design. At present, the specialtyof environmental art design offered by universities in our country starts relatively late compared with foreign countries. The basic course and thespecialized course, the theory class and the practice class have the serious disconnection phenomenon. In addition, there are some problems in theconstruction of teaching staff. The teaching experience, academic level and professional level of teachers need to be further improved. Therefore,environmental art design specialty teaching reform must proceed from the actual environmental art design, strengthen the application of practiceteaching, which will be closely connected with the market, the theoretical knowledge learned in the classroom through the practice has beenconsolidated, cultivate creative design thinking of designer.

Measures for the Optimization of Subgrade and Pavement Design in the Reconstruction and Expansion of Highways

In comparison to the construction of modern highway engineering,several of China’s early pavement construction concerns,such as pavement collapse,are rather clear.Limited by historical and technical factors,the subgrade and pavement design for highways lacks scientificity,thus inducing potential safety problems in the operation.In order to comprehensively improve the subgrade and pavement design as well as ensure the quality and safety of highway engineering projects,this paper takes the reconstructed and expanded highway projects as research subjects and focuses on proposing optimization measures for the subgrade and pavement design of reconstructed and expanded highways,so as to provide adequate reference.

COMPLEX SURFACE RECONSTRUCTION BASED ON OBJECT-ORIENTED DEVELOPING TOOL VBA

Taking AutoCAD2000 as platform, an algorithm for the reconstruction ofsurface from scattered data points based on VBA is presented. With this core technology customerscan be free from traditional AutoCAD as an electronic board and begin to create actual presentationof real-world objects. VBA is not only a very powerful tool of development, but with very simplesyntax. Associating with those solids, objects and commands of AutoCAD 2000, VBA notably simplifiesprevious complex algorithms, graphical presentations and processing, etc. Meanwhile, it can avoidappearance of complex data structure and data format in reverse design with other modeling software.Applying VBA to reverse engineering can greatly improve modeling efficiency and facilitate surfacereconstruction.

Analysis of Energy Saving Reconstruction of Existing Campus Dormitories in Chongqing——Taking Dormitory Six on Campus B of Chongqing University as An Example

At present,a large number of historic buildings on campus are lack of energy-saving measures from the design time,especially the dormitories. And the reconstruction mostly focuses on functional reorganization or furniture replacement. However,energy efficiency design has not been paid enough attention,which leads to the high building energy consumption and the harsh physical environment. Based on the analysis of climatic characteristics of Chongqing area,taking Dormitory Six on campus B of Chongqing University as an example,the reconstruction of rooms on the top floor and West end are focused to guarantee the equal benefits of the dormitory environment. Through the simulation analysis of the software, on the basis of energy saving reconstruction of common maintenance structure,this thesis discusses the energy saving reconstruction methods and strategies of the existing campus dormitories,which are more suitable for the existing campus dormitories in Chongqing area.

Application of digital technology in nasal reconstruction

Nasal defects are facial defects caused by trauma,tumors,or congenital diseases that seriously damage a patient’s physical and mental health.Nasal defects,from skin defects to total nasal defects,require surgical repair and reconstruction to restore the appearance and function of the nose,which have always been challenges for rhinoplasty.The development of digital technology has increased the possibility of nasal reconstruction.Digital technology is involved in the preoperative,intraoperative,and postoperative stages of nasal construction and is of great significance in improving the effect of this surgery.This article reviews the application of major digital technologies,including three-dimensional(3D)imaging technology,computer-assisted surgical navigation,and 3D printing,in nasal reconstruction and discusses the shortcomings of the current application of digital technology.

基于Geomagic Design X的复杂零件逆向设计方法研究

逆向设计是一种快速获得已有产品(或零件)数字化模型的方法,可用于产品的再创新设计,利用3D打印技术,可直观呈现逆向后的数字化模型。以一种曲面光滑的回力马车为研究对象,详细阐述了逆向设计中点云采集、模型处理、逆向建模及模型精度检测等流程。采用的逆向设计方式精确地构建出回力马车的数字化实体模型,满足设计要求,对其他类似零件的结构创新、模型重建及制造有一定的借鉴意义,对复杂曲面的产品设计与制造也有一定的参考价值。

中国传统地域建筑文化的当代重构议题——基于徽州合院形式的设计探索

徽州合院是特定地域内自然环境和社会文化在建筑形式上的重要表征。本文针对中国传统地域建筑文化的当代重构议题,立足于徽州合院形式的设计探索,从形式美学、空间组织、场所营造三个方面解析传统徽州合院地域特征,运用特征归纳、比较分析、案例解读等方法解读三个当代建筑案例,进而揭示出徽州合院在形式操作、空间组织、组群构建三个层级上转译与重构方法,阐释当今地域创作中对徽州合院形式的传承与变异,探索徽州合院形式对当代创作的潜能,并探讨建筑实践中传统与当代、地域与全球的关系。

基于文化场域理论的武当文创产品设计研究

目的以文化场域理论为指导,梳理武当山文化场域中的符号类型与文化意象,探索武当山文创视觉设计新思路,为传统武当文化意象的推陈出新提供指引,并与新时代审美相融合。方法将武当山文创视觉设计分为四个层级,通过不同层级下的视觉语言,运用解构与重构、变异与重组等方法,提取出视觉符号并结合设计实践,构建符合新时代传播要素及文化赋能的创新理论框架。结果提炼出武当山文化场域内特有的文化符号和意象并融入设计中,得到一系列具有武当文化独特精神与韵味的文创产品设计。结论基于场域视角研究武当道教文化的视觉元素符号,可以更全面地挖掘和展示武当的文化特色,能从历史脉络与人文习俗中凝练文化符号,将传统与现代的审美特征相结合,为文化符号赋予趣味性和灵动性,从而清晰有效地向大众传播武当文化。

城市交通轨道车辆管控虚拟重构方法设计

为确保自动驾驶车辆在道路交通环境中的安全性,并实现对其整体化和精准化组织调度,文章引入了虚拟车辆管控理论,深入研究了城市交通轨道车辆的虚拟管控重构方法。该方法采用多目标排序方式,对交通轨道上的车辆进行虚拟重构,设计了一种多目标虚拟线路交通轨道重构策略。此外,构建了轨道交通车辆的虚拟调度重构模型,并通过动态交互处理方式实现了虚拟调度的计算。经过测试验证,在不同路段的时间控制下,该方法表现出良好的实时请求接受和处理能力,实时请求接受率超过1.2%,证明了其高性能和高效率。同时,虚拟重构的车辆平均行驶速度误差控制在3.2%以内,体现了其高精准性。

数字化背景下高校图书馆空间再造理论与实践

随着信息数字化技术的发展,高校图书馆自身空间功能日益丰富,读者外在需求不断刺激功能的完善与补充。在内外因双重影响下,高校图书馆发展与转型势在必行。在这样的发展背景下,文章从空间再造的角度探讨当下发展现状,分析现有研究理论,结合相关案例,提出了空间表现形式转型、保持空间弹性、功能的融合与生长、空间的开放与协同、空间融合技术创新、绿色节能环保技术等设计策略,期望对未来相关设计有所裨益。

工业遗产再利用背景下的城市亲子互动空间设计研究

工业建筑空间极具特色,将工业建筑遗产与亲子互动空间相结合,能增加亲子活动空间的独特性,又能赋予工业遗产新的功能,传播工业遗存本身所承载的文化符号,增强空间体验感受。文章通过对亲子互动空间设计的思考,将工业遗产改造为亲子互动空间的基本设计方法进行探究,提出适宜的改造策略,给亲子互动空间赋予新的文化内涵,推动工业遗产的发展,使工业遗产与亲子空间相互促进、相互融合。