基于多尺度及DESTIN约束的高分遥感影像田块语义分割方法研究

[目的]本研究旨在改善基于深度学习的遥感影像田块语义分割中出现的区域不封闭、边缘不贴合、噪点问题,并进一步修正语义分割的识别错误。[方法]以安徽省阜南县、江苏省淮安市为研究地点,自建了农田田块数据集,引入考虑影像多尺度特征的尺度分割思想与基于物候学的DESTIN(delineation by fusing spatial and temporal information)分割算法,提出了基于多尺度及DESTIN约束的高分遥感影像农田田块语义分割方法。[结果]多尺度与DESTIN约束下基于深度模型的田块语义分割有效改善模型出现的区域不封闭、边缘不贴合、噪点和块状模糊等问题,一定程度修正了深度模型语义分割的错误识别,IoU指标在2个测试集上分别达到94.08%和90.79%,相较深度模型的遥感影像田块语义分割分别提高1.65%和2.32%,对研究区域的田块提取区域更完整、精度更高。[结论]多尺度及DESTIN约束进一步改善了田块语义分割问题,有助于提高高分遥感影像的田块识别精度。

基于多源大数据的城市旅游目的地吸引力评价研究--以武汉市为例

目的地吸引力是旅游者选择前往某地旅游的重要因素,对目的地旅游业的发展至关重要。已有研究虽然在特定领域内取得了丰富的成果,但在数据来源的多样性和全面性、评价方法的科学性和高效性等方面仍存在需改进的空间。本文以武汉市为研究对象,构建城市和景区两个层面的旅游吸引力评价指标体系,融合旅游网站数据、兴趣点数据、街景图像数据等多源数据,采用两步移动搜寻法和图像语义分割法对景区吸引力评价指标进行计算;并采用熵权–TOPSIS方法定量分析武汉市及其各级旅游景区的吸引力。结果表明:尽管武汉市的旅游资源丰富,其总体旅游吸引力水平仍落后于其他热门旅游城市,如西安、成都等;旅游景区吸引力与景区等级正相关,高等级景区具有更高的吸引力;位于中心城区的景区,其旅游吸引力得分明显高于郊区。研究成果可为武汉市及类似城市的旅游资源优化配置和旅游政策制定提供数据支持依据。

Multi-features Based Approach for Moving Shadow Detection

In the video-based surveillance application, moving shadows can affect the correct localization and detection of moving objects. This paper aims to present a method for shadow detection and suppression used for moving visual object detection. The major novelty of the shadow suppression is the integration of several features including photometric invariant color feature, motion edge feature, and spatial feature etc. By modifying process for false shadow detected, the averaging detection rate of moving object reaches above 90% in the test of Hall-Monitor sequence.

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST)

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST, also called the Guo Shou Jing Telescope) is a special reflecting Schmidt telescope. LAMOST’s special design allows both a large aperture (effective aperture of 3.6 m–4.9 m) and a wide field of view (FOV) (5°). It has an innovative active reflecting Schmidt configuration which continuously changes the mirror’s surface that adjusts during the observation process and combines thin deformable mirror active optics with segmented active optics. Its primary mirror (6.67m×6.05 m) and active Schmidt mirror (5.74m×4.40 m) are both segmented, and composed of 37 and 24 hexagonal sub-mirrors respectively. By using a parallel controllable fiber positioning technique, the focal surface of 1.75 m in diameter can accommodate 4000 optical fibers. Also, LAMOST has 16 spectrographs with 32 CCD cameras. LAMOST will be the telescope with the highest rate of spectral acquisition. As a national large scientific project, the LAMOST project was formally proposed in 1996, and approved by the Chinese government in 1997. The construction started in 2001, was completed in 2008 and passed the official acceptance in June 2009. The LAMOST pilot survey was started in October 2011 and the spectroscopic survey will launch in September 2012. Up to now, LAMOST has released more than 480 000 spectra of objects. LAMOST will make an important contribution to the study of the large-scale structure of the Universe, structure and evolution of the Galaxy, and cross-identification of multiwaveband properties in celestial objects.

A Comparative Study of Acute Hemodynamic Effects of Multi -site Cardiac Pacing in patients with cardiac function NYHA class ⅠtoⅡ without bundle branch block

Objective To compare the acute hemodynamic effects of five different pacing modes in patients with cardiac function NYHA class Ⅰ to Ⅱ without bundle branch block (BBB). Methods This study included 12 patients (SSS 7, Ⅲ°AVB 5) undergoing pacemaker implantation. Right ventricular apex (RVA), right ventricular outflow tract (RVOT), right ventricular bifocal (RV-Bi), left ventricular base (LVB) and bi -ventricular (Bi-Ⅴ) pacing at 60 -80 ppm were done in VVI mode prior to implantation of DDD pacemaker. The cardiac index (CI), mean pulmonary artery pressure (mPAP) and pulmonary capillary wedge pressure (PCWP) were measured with Swan - Ganz thermodilution catheter after 5 minutes of each pacing mode. Results (1) Comparing to pacing at RVA (CI: 2. 41± 0. 38 L/min per m2, PCWP: 16. 7 ±3.3 mmHg), the CI increased and the PCWP decreased significantly in pacing at RVOT(CI: 2. 63 ± 0.46, PCWP: 13. 8±2. 3), LVB(CI: 2. 78±0.52, PCWP: 14. 4±3.1), RV-Bi(CI: 2. 83±0.57, PCWP: 12. 8± 2. 5) and Bi -Ⅴ pacing (CI: 2. 94± 0.60, PCWP: 12. 7±2. 5), P < 0. 01, respectively. (2) The CI of RV-Bi and Bi-Ⅴ pacing was higher than that of RVOT and LVB pacing, the PCWP was lower, P < 0. 05, respectively. (3) There was no significant difference between RV - Bi pacing and Bi-Ⅴ pacing in CI and PCWP. Conclusion There is no significant difference between RV - Bi pacing and Bi -V pacing in the acute hemodynamic effects; however,dual - site pacing is much better than single site pacing in that aspect for patients with cardiac function NYHA class Ⅰ to Ⅱ without BBB. Among single site pacing, the RVOT and LVB pacing is better than RVA pacing in cardiac function.

Research on A Master - slave Multi - microcomputers Control System for Hollow Spindle Fancy Yarn Spinning Machine

In this paper, a successfully studied and developed master - slave muld - microcomputers control system based on PC - BUS for hollow spindle fancy yarn spinning machine, mainly Its overall scheme, software and hardware construction, is introduced. Spinning experiments show that the system achieves satisfactory result. This system can solve the diftkultles of mechatronical fusion between domestic hollow splndk fancy yarn spuming muchine and its microcomputer control technology.

On the Representation of Multi-layer Woven Structure

A quantitative method is developed to identify the structures of multi-layer woven fabric in this study. Six structural parameters are selected to represent the fabric structure. With some design criteria for the reinforcement of textile composites, the relationships among the structural parameters are derived for different binding patterns of the fabric structure. The conditions, which meet the requirements of structural cell stability,are also discussed.

Computer-aided Pattern Design of Multi-bar Warp Knitted Fabrics

To meet the development trend of multi-bar warp knit-ting machine towards high-speed,advanced technologyand computer control and the requirements of variousproducts with small quantity,there are many researcheson the computer-aided pattern design of multi-barwarp knitted fabrics.In terms of the special propertiesof the computer-aided pattern design of multi-barwarp knitted fabrics,the Object Oriented Program(OOP)programming-Object Windows class Library(OWL)programming is selected.According to thecharacters of the OWL programming,various functionsare defined.Pattern design and technical parameters canbe output,which offers a great convenience for the fac-tory.

MODS： A Novel Metaheuristic of Deterministic Swapping for the Multi-Objective Optimization of Combinatorials Problems

This paper states a new metaheuristic based on Deterministic Finite Automata （DFA） for the multi - objective optimization of combinatorial problems. First, a new DFA named Multi - Objective Deterministic Finite Automata （MDFA） is defined. MDFA allows the representation of the feasible solutions space of combinatorial problems. Second, it is defined and implemented a metaheuritic based on MDFA theory. It is named Metaheuristic of Deterministic Swapping （MODS）. MODS is a local search strategy that works using a MDFA. Due to this, MODS never take into account unfeasible solutions. Hence, it is not necessary to verify the problem constraints for a new solution found. Lastly, MODS is tested using well know instances of the Bi-Objective Traveling Salesman Problem （TSP） from TSPLIB. Its results were compared with eight Ant Colony inspired algorithms and two Genetic algorithms taken from the specialized literature. The comparison was made using metrics such as Spacing, Generational Distance, Inverse Generational Distance and No-Dominated Generation Vectors. In every case, the MODS results on the metrics were always better and in some of those cases, the superiority was 100%.

Determining capacity of multimodal multi-commodities freight transportation network from critical link volumes

The commodity transportation capacity between all origin-destination （ OD ） pairs over the multimodal multi-commodities freight transportation network （MMFTN） is determined. A multi-ob- jectives mathematical model is formulated for determining the OD capacity over the MMFTN accord- ing to a transporting capacity matrix that increased from the reference matrixes. The corresponding incremental factor for estimating the capacity matrix is obtained via the maximal likelihood estima- tion method that samples data of differences between the estimated commodity volumes and carrying capacities of the critical links. The proposed formulations are tested by an experimental highway and railroad freight transportation network in an existing literature. The relevant results of OD capacities are displayed and applicability of the algorithm is certified.

多维邻近性与流动人口家庭迁移的迁入地选择

理解流动人口核心家庭迁移模式和迁入地选择机制,对于推进流动人口市民化、实现“以人为本的城镇化”具有重要意义。研究基于2017年全国流动人口动态监测调查数据,运用条件logit模型,从户籍地与迁入地城市相似性的视角出发,分析户籍地与迁入地间多维邻近性对流动人口家庭迁移迁入地选择的影响。结果表明:(1)城市间工资、产业结构、信息和服务邻近降低了城市被选的概率,而地理和制度邻近则相反。以地理和制度因素为代表的环境阻力对流动人口核心家庭迁移的影响最大;此外,经济势能和社会势能高会提高迁入地被选择的概率。(2)邻近性存在调节效应,有利的制度、较低的信息搜寻成本,以及相似的平均工资、产业结构和公共服务均会抑制地理距离的负面影响。(3)不同迁入地、户籍地和家庭类型具有异质性效应,迁往东部的家庭受服务邻近影响较小,迁往中部地区的家庭受经济势能影响较大,迁往西部和东北地区则受社会势能影响较大;户籍所在区域也会先决性影响其迁入地的选择;不同人力资本水平、户口类型的家庭间迁入地选择策略也不同。

网红经济时代旅游地意象塑造演化的过程机制研究——以“淄博烧烤”为例

聚焦网红旅游地淄博,参照网络文本分析法,探究旅游地和游客多主体间互动推动旅游地意象持续塑造演化过程机制。结果显示:(1)网红经济时代“淄博烧烤”意象是在旅游地和游客互动耦合下被塑造并不断叠加演化;(2)意象演化经历了网络发酵期、政府主导期、游客自发期和意象回稳期,各阶段意象驱动力分别是网络媒介、政府主体、游客行为和稳固意象,且演化过程类似旅游地生命周期理论,但因网红经济特性,其生命周期时长及演化速度有所不同;(3)居民以积极参与和热情态度一改“主客”不平衡关系,勾勒出良好意象的清晰事实,凸显其在意象塑造中的地位和作用。

多目的地ZTCM在旅游价值评估中的应用--以嘉峪关市为例

在旅行费用法(TCM)理论与应用的研究基础上,考虑游客出游时对于多个旅游目的地的选择以及旅行时间机会成本等问题,提出了多目的地ZTCM的基本思路与技术路线以及评估流程,并以嘉峪关市为例,对其国内旅游客源地划分为39个出游小区选定11个旅游目的地出游组合,利用门票价格及居民消费水平等指标计算各出游组合中嘉峪关市所占的旅游价值比例,对其进行合理的游憩价值评估。结果显示嘉峪关市2006年的旅游价值为7.384762亿元,其中国内旅游价值为6.227939亿元,海外旅游价值为1.156823亿元,与当年旅游收入4.62673亿元进行对比,可以发现嘉峪关市发展旅游的潜力比较大。此外,还对多目的地ZTCM的可行性以及评估结果进行了讨论分析。

基于多源数据的自然旅游地旅行者时空分布及其驱动因素

为真实反映旅行者行为,优化自然旅游目的地的规划与管理,以“两步路”中的旅行者活动标记点作为数据源,根据标记点集中程度界定的自然旅游目的地为研究对象,借助GIS时空分析工具及地理探测器分析,总结旅行者的时空分布特征,并选取自然环境因子、人文社会因子作为驱动指标,探究旅行者空间分布的驱动因素。研究结果发现:(1)旅行者活动表现出明显的空间异质性特征,形成了27个旅行者活动热区。(2)旅行者年际分布处于集聚状态,最近邻指数呈现“U”型曲线形式,空间分布均比较集中,但热点区域年际变化明显,“单核心”集聚到“平行多核心”再到“双核心”“单核心”,说明该旅游目的地内部竞争格局处在变动中。(3)夏、秋2个季节旅行者活动集聚,旅行活动热区比较集中,但不同季节旅行者空间分布差异性明显。(4)景点、餐饮、住宿等服务设施是旅行者活动空间分异性的决定因素,其中景点是主导因素。综上所述,以旅行者标记点为主的时空大数据能更细致的刻画自然旅游地的旅游者行为特征。

民族旅游地游客的地方信任变动及主体响应策略

在地方消费与情感消费叠加的背景下,地方信任日渐成为民族旅游地的新型旅游资源,关系到其可持续发展以及民族间的交往交流交融。文章以凤凰古城作为典型案例地,通过深度访谈、非参与式观察、网络民族志等质性研究方法开展实证分析,研究发现:游客的地方信任具有鲜明的变动性,具体表现为时空变动性与结构变动性两个层面。时空变动性在时间层面意味着在旅游前、旅游中以及旅游后的时间维度上,游客的地方信任账户因游客的地方想象与临场体验的不断协商而有所变动,在空间层面上体现为游客的地方信任在虚拟空间与现实空间之间双向迁移。结构变动性在信任状态层面处于信与不信交织的状态,在信任对象层面表现为地方品牌信任、旅游消费信任、地方政府信任之间互相传递,形成一幅由不同情境、不同信任对象、不同信任状态拼贴而成的马赛克式信任景观。游客、商家、地方政府分别采取自我应对与协同应对、主动履行公民责任、给予制度保障等策略以响应动态变化的地方信任。

多维邻近性与城-城流动人口的流入地选择——基于嵌套Logit模型的实证分析

基于2017年中国流动人口动态监测调查数据,采用嵌套Logit模型分析了地理、制度、信息和知识等多维邻近性对城-城流动人口流入地选择的影响。结果表明:城-城流动人口倾向于流入与户籍地地理相邻、制度相似、信息联系密切以及与自身知识水平相匹配的城市,这在一定程度上缓解人口向工资水平高、就业机会多和公共服务水平好的大城市集聚的趋势;不同维度的邻近性之间存在替代效应,省内流动能够降低距离对流入地选择的负面影响;多维邻近性的影响强度存在群体差异,女性对知识邻近性更加敏感;新生代流动人口对正式制度和信息邻近的城市有更强的偏好,但受知识邻近性的影响较弱;高学历群体更能远距离、跨省迁移并受到城市间互联网信息联系更强的影响;而有过流动经历的劳动力再流动时更能克服地理、文化和知识距离的限制。

Pressure Gradient Force,Saffman Lift,and Magnus Lift on the Fiber-like Particle in Fluid

Flher-like particle suspensions are common in both na-ture and industry, but there is little work reported on it.The forces acting on the fiber - like particle in fluid arestudied in this paper, and the Magnus lift, Saffman lift,pressure gradient force, and then the dynamics modelhave been received. The numerical study of the simpleshear flow past the cylinders shows that the particles ’motion is controlled by the vortex.

FORTH与MCS-51相结合——一种考虑及实现

本文讨论了FORTH与MCS-51微控制器相结合的一些概念及细节。介绍一种MCS-51 FORTH开发系统。

基于蚁群决策与滚动控制的多目的地航迹规划

在战时无人机多目的地物资运输任务中,因其复杂的环境和多变的物资需求,存在目的地决策困难和航迹规划实时性要求高的问题。为了解决这一问题,提出一种基于蚁群决策与滚动控制的多目的地航迹规划方法。该方法借助蚁群算法中的寻优机制,建立以最小损耗为目标的多目的地决策函数;此外,采用基于扩充解的滚动时域控制(RHC_eS)法,采取边走边决策的策略,进行多目的地航迹规划;最后,为了验证该方法的有效性,在带有障碍物的多目的地环境下进行实验。结果表明,与其他方法相比,所提方法具有规划航路短、产生损耗小的优越性能。

多维感官体验视阈下目的地感官印象的识别与分析——以环巢湖旅游目的地为例

感官印象是旅游体验的重要影响因素,创造与众不同的感官印象是旅游目的地打造竞争优势的重要途径之一。基于游客的游记数据,分析得到游客对环巢湖旅游目的地的感官印象,识别目的地的感官体验供给状况。结果表明:环巢湖旅游目的地感官印象存在视觉印象差异化不明显、听觉印象缺乏区域特色、嗅觉体验来源单一、触觉感官刺激的利用不充分和味觉印象表现不佳等问题。需要运用营造感官景观、保护感官景观、丰富旅游活动类型和运用感官营销工具等策略推进环巢湖旅游目的地可持续发展。