Circle社交网络系统衍生的社区互助模式探究

探究Circle社区网络系统衍生的社区互助模式并总结传统设计与协同创新设计对于协同设计者的职能要求。从多元主体、理念衍生与模式思辨三个层次梳理Circle服务系统流程及利益相关者,剖析Circle社区网络系统的设计模式。基于此,文章从行为认同、情感互动及体验价值三个层面建构了社区协同互助模式的设计策略,并进一步扩展出协同设计者的四条职能:思辨设计思维、跨学科知识体系、能级导向设计及协调创新。Circle社交网络系统衍生的社区协同互助模式在一定程度上能够引导和优化本土化社区的弹性和韧性,朝着更加有利于社会创新模式的方向不断发展。

Closed circle DNA algorithm of change positive-weighted Hamilton circuit problem

Chain length of closed circle DNA is equal. The same closed circle DNA＇s position corresponds to different recognition sequence, and the same recognition sequence corresponds to different foreign DNA segment, so closed circle DNA computing model is generalized. For change positive-weighted Hamilton circuit problem, closed circle DNA algorithm is put forward. First, three groups of DNA encoding are encoded for all arcs, and deck groups are designed for all vertices. All possible solutions are composed. Then, the feasible solutions are filtered out by using group detect experiment, and the optimization solutions are obtained by using group insert experiment and electrophoresis experiment. Finally, all optimization solutions are found by using detect experiment. Complexity of algorithm is concluded and validity of DNA algorithm is explained by an example. Three dominances of the closed circle DNA algorithm are analyzed, and characteristics and dominances of group delete experiment are discussed.

Volume calculation of the spur gear billet for cold precision forging with average circle method

Forging spur gears are widely used in the driving system of mining machinery and equipment due to their higher strength and dimensional accuracy.For the purpose of precisely calculating the volume of cylindrical spur gear billet in cold precision forging,a new theoretical method named average circle method was put forward.With this method,a series of gear billet volumes were calculated.Comparing with the accurate three-dimensional modeling method,the accuracy of average circle method by theoretical calculation was estimated and the maximum relative error of average circle method was less than 1.5%,which was in good agreement with the experimental results.Relative errors of the calculated and the experimental for obtaining the gear billet volumes with reference circle method are larger than those of the average circle method.It shows that average circle method possesses a higher calculation accuracy than reference circle method(traditional method),which should be worth popularizing widely in calculation of spur gear billet volume.

Delineation of an Urban Community Life Circle Based on a Machine-Learning Estimation of Spatiotemporal Behavioral Demand

Delineating life circles is an essential prerequisite for urban community life circle planning. Recent studies combined the environmental contexts with residents’ global positioning system(GPS) data to delineate the life circles. This method, however, is constrained by GPS data, and it can only be applied in the GPS surveyed communities. To address this limitation, this study developed a generalizable delineation method without the constraint of behavioral data. According to previous research, the community life circle consists of the walking-accessible range and internal structure. The core task to develop the generalizable method was to estimate the spatiotemporal behavioral demand for each plot of land to acquire the internal structure of the life circle, as the range can be delineated primarily based on environmental data. Therefore, behavioral demand estimation models were established through logistic regression and machine learning techniques, including decision trees and ensemble learning. The model with the lowest error rate was chosen as the final estimation model for each type of land. Finally, we used a community without GPS data as an example to demonstrate the effectiveness of the estimation models and delineation method. This article extends the existing literature by introducing spatiotemporal behavioral demand estimation models, which learn the relationships between environmental contexts, population composition and the existing delineated results based on GPS data to delineate the internal structure of the community life circle without employing behavioral data. Furthermore, the proposed method and delineation results also contributes to facilities adjustments and location selections in life circle planning, people-oriented transformation in urban planning, and activity space estimation of the population in evaluating and improving the urban policies.

Mathematical Model of the Identical Slope Surface

The formation of the identical slope surface and the method of construction are discussed. On the basement of building the parameter equation of variable-radius circle family envelope, the frequently used parameter equation of the identical slope surface of the top of taper moving along column helix, horizental arc and line is built. The equation can be used to construct the identical slope surface’s contours, gradient lines and three dimensional figures correctly.

Semi-parametric Adjustment Model Methods for Positioning of Seafloor Control Point

This paper focus on solving the problem of seafloor control point absolute positioning with low vertical accuracy based on the survey ship sailing circle. The method of dealing with the systematic error based on a semi-parametric adjustment model was proposed. Firstly, the influence of sound velocity change on ranging error is analyzed. Secondly, a semi-parametric adjustment model for determining three-dimensional coordinates of seafloor control points was established. And respectively proposed solutions under two different conditions, the observation duration is an integral multiple or non-integer multiple of the long-period term of the ranging error. The simulation experiment shows that this method can obviously improve the accuracy of vertical solution of seafloor control point compared with the difference technique and the least-squares method when internal waves exist and observation duration is less than an integer multiple of the long-period term of the ranging error.

Synchronization–desynchronization transitions in networks of circle maps with sinusoidal coupling

Coupled phase oscillators are adopted as powerful platforms in studying synchrony behaviors emerged in various systems with rhythmic dynamics. Much attention has been focused on coupled time-continuous oscillators described by differential equations. In this paper, we study the synchronization dynamics of networks of coupled circle maps as the discrete version of the Kuramoto model. Despite of its simplicity in mathematical form, it is found that discreteness may induce many interesting synchronization behaviors. Multiple synchronization and desynchronization transitions of both phases and frequencies are found with varying the coupling among circle-map oscillators. The mechanisms of these transitions are interpreted in terms of the mean-field approach, where collective bifurcation cascades are revealed for coupled circle-map oscillators.

Physical Modeling of the Enzymatic Glucose-Fuelled Fuel Cells

An enzymatic glucose biofuel cell uses glucose as fuel and enzymes as biocatalyst, to transform biochemical energy into electrical energy. An analytical modelling of an enzymatic biofuel cell should be used, while developing fuel cell, to estimate its various enzymatic parameters, to obtain the highest voltage feasibly. The analytical model was developed, and the open circuit voltage (OCV) calculated by the model for various parameters of the fuel cell is in agreement with the experimental results. The OCV is interpreted by using this model, based on theoretical consideration of ions transportation in the solution. The generation and consumptions of the ions near the electrodes were defined in the model by exponential approximations, with different depletion coefficients. The model reveals that increasing the rates of hydrogen ions generation and (or) consumption by enzyme or chemical reactions leads to a higher value of OCV. The model points that the OCV is saturated with a glucose concentration and increased logarithmically with a surface enzyme concentration. Hence, a low glucose concentration is sufficient to obtain adequate OCV, on the one hand, but it can be increased by increasing electrode surface porosity, on the other hand. This model can be expanded to include time and close circuit voltage.

On Single Compartment Pharmacokinetic Model Systems that Obey Michaelis-Menten Kinetics and Systems that Obey Krebs Cycle Kinetics

The integration of Michaelis-Menten kinetics results in a trancedental equation. The results are not in a form that is readily usable. A more usable form of the model solutions is developed. This was accomplished by using Taylor series expansion of dimensionless concentration u in terms of its derivatives. The infinite series expression for dimensionless concentration is given. It can be seen that for times t < , the Taylor series expression evaluated near the origin up to the third derivative is a reasonable representation of the integrated solution. More terms in the Taylor series expression can be added to suit the application. It can vary with the apparent volume, dosage, enzyme concentration, Michaelis constant and the desired accuracy level needed. The single compartment model solution was obtained by the method of Laplace transform. It can be seen from Figure 2 that the dimensionless drug concentration in the compartment goes through a maxima. The curve is convex throughout the absorption and elimination processes. The drug gets completely depleted after a said time. The curve is asymmetrical with a right skew. The systems under absorption with elimination that obey the kinetics that can be represented by a set of reactions in circle were considered. A system of simple reactions in circle was taken into account. The concentration profile of the reactants were obtained by the method of Laplace transforms. The conditions when subcritical damped oscillations can be expected are derived. A model was developed for cases when absorption kinetics exhibit subcritical damped oscillations. The solution was developed by the method of Laplace transforms. The solution for dimensionless concentration of the drug in single compartment for different values of rate constants and dimensionless frequency are shown in Figures 6-9. The drug profile reaches a maximum and drops to zero concen-tration after a said time. The fluctuations in concentration depends on the dimensionless frequency resulting from the subcritical damped oscillations during absorption. At low frequencies the fluctuations are absent. As the frequency is increased the fluctuations in concentration are pronounced. The fre-quency of fluctuations were found to increase with increase in frequency of oscillations during ab-sorption.

长江经济带上中游地区城市工业生态效率时空演变及驱动机制——以成渝经济圈和武汉都市圈为例

实现最优工业生态效率对促进工业绿色发展有着重要的现实意义。本文通过非期望产出的SBM模型,测度长江经济带上中游代表性地区成渝经济圈和武汉都市圈26个城市2010—2021年工业生态效率,通过Arcgis可视化工具对比分析其时空演变规律,并运用Tobit模型和地理探测器模型分别识别工业生态效率的驱动因素。结果表明:1)两个城市群工业生态效率整体均呈现波动上升态势,且与最优效率还存在一定的差距;2)城市群内部的地级市之间效率值存在少部分两极分化的现象;3)工业生态效率受科技研发投入、经济发展水平、交通可达性、对外开放水平等多个因素的影响,其中经济发展水平和交通可达性对于工业生态效率的提升起到较强的促进作用,对外开放程度与科技研发投入对于工业生态效率的促进作用还不明显,还需要进一步提高外商投资水平和增强科技研发投入质量以实现其对工业生态效率的正向影响。为此,通过强化城市群内外部的融合发展、构建协同创新网络和提升对外开放水平,以提高长江经济带上中游地区工业生态效率水平,促进地区高质量发展。

课题研究型品管圈在早产儿经口胃管置入管理模式中的应用

目的探讨课题研究型品管圈活动在构建早产儿经口胃管置入管理模式中的应用价值。方法选取2020年1月至2022年12月该院需行经口胃管置入的280例早产儿,以品管圈活动前(2020年1月至2021年12月)收治的180例早产儿为对照组,实施品管圈活动后(2022年6-12月)收治的100例早产儿为观察组。比较2组胃管前端一次性到位率及恶心、呕吐发生率,分析品管圈活动前后圈员综合素质评分。结果2组胃管前端一次性到位率比较,差异有统计学意义(P<0.05),而恶心、呕吐发生率比较,差异无统计学意义(P>0.05)。观察组品管圈活动目标达成率110.9%。品管圈活动后,圈员综合素质评分较活动前得到不同程度的提升,其中品管手法及创新精神能力评分得到明显提高。结论基于课题研究型品管圈活动构建的早产儿经口胃管置入管理模式,能够有效提高早产儿经口胃管前端一次性到位率,降低置管相关并发症发生率。

老城区社区生活圈测度及公共服务设施优化研究--以宜宾市为例

在我国城镇化的下半场,以人为本、存量规划和集约发展成为当下城市的主旋律,作为承载城市记忆的老城区社区生活圈亟待更新优化。以宜宾市老城组团为例,采用连锁网络模型和基于真实路网的设施可达性分析等方法,结合10大类公服设施POI数据、当地居民对设施的重要性评价数据,对研究区域进行了10分钟社区生活圈的测度探索,并在测度结果的基础上,以生活圈为视角提出了相应公服设施的优化及择址建议。研究结果表明:第一,宜宾老城共可划定出4个10分钟社区生活圈,平均用地规模较小于平原、省会、特大型城市;第二,4个生活圈整体都存在公园广场、社会福利、科教文化这3类设施数量较为欠缺及覆盖范围较小的共性问题;第三,各生活圈生活便利度差异明显,发展不均衡。未来宜侧重优化过渡区、边缘生活圈欠缺设施;第四,基于设施覆盖率及居民可达程度考虑,每个生活圈宜提供中心度前三的地块中心点作为10分钟层级设施的推荐设置点。

基于组合基元法的非理想模型装配偏差预测算法研究

基于模型定义(model-based definition,MBD)体系的装配偏差算法适用于赛博空间中理想数模的装配场景,但不适用于物理空间中非理想状态的装配场景,导致现场产生大量修配工作。针对这一问题,文章模拟真实的装配场景,基于零件的非理想状态,并将配合特征之间的拓扑关系考虑在内,对装配偏差的传递与累积过程展开研究,给出一种装配偏差预测算法。首先,针对孔轴配合与槽轴配合,将装配约束转化为定位点约束,依据最大实体原则,构造柱面点云的最小包围圆,确定接触状态,给出串行装配偏差算法,并将以上两种配合定义为两种基元,对应的装配偏差算法定义为两种独立基元算法。其次,基于平面贴合、孔轴配合与槽轴配合给出并行装配偏差算法,并将其定义为组合基元算法。最后,基于非理想模拟数据进行实例验证,达到了准确预测装配偏差的目标,为后续在赛博空间基于实测数据的装配偏差计算提供理论依据,以促进高精度装配。

成渝地区双城经济圈数字化要素对产业结构升级的空间效应

数字要素赋能已成为成渝地区双城经济圈产业升级的新途径,然而,目前缺乏对其在地理、经济和数字新型基础设施建设(以下简称“新基建”)等距离特征条件下数字化要素产生的空间效应的深入研究。为对成渝地区双城经济圈产业高质量发展在政策层面提供理论支持,从数字化创新环境、数字化创新技术、数字化人力资本、数字化劳动力、数字化资本等维度构建数字化要素评价体系,选取2012—2021年成渝地区双城经济圈的空间面板数据,基于地理、经济和数字新基建距离特征建立内生增长模型,运用空间计量模型实证分析成渝地区双城经济圈数字化要素和产业结构升级的关系。结果表明:成渝地区双城经济圈数字化要素和产业结构升级具有禀赋差异特征和时空集聚特征,且域间集聚差异在逐步扩大,3种距离特征下“成都+重庆”中心城市产业呈现出显著的生态化、集群化和丛林化特征,其他地区产业发展呈现出显著的专业化特征,对中心城市的空间依赖性越来越强。赋能产业结构升级方面,3种距离特征下,数字化要素对域内带来空间效应、对域外带来空间外溢效应,资源禀赋对域内具有空间促进作用、对域外具有空间抑制作用;在地理距离特征条件下,数字化技术创新对域外具有空间抑制作用;在数字新基建距离特征条件下,数字化人力资本具有空间抑制作用。此外,动态空间面板模型可以修正静态空间面板模型产生的过高空间估计误差。据此,建议加强成渝两极协同发展,形成两地产业的梯度化分工格局,实现成渝“双核”驱动相邻区域发展。

“双碳”目标下山东省三大经济圈农业生态效率时空分异及影响因素

在“双碳”背景下农业生产要素的使用受到限制,实现农业绿色生产,提高农业资源利用率对尽快实现农业农村现代化显得尤为必要。山东省力争打造乡村振兴齐鲁样板,对提升农业生态效率的需求更为迫切。基于此,首先选用基于松弛变量测量(SBM)的超效率模型综合测度山东省农业生态效率,其次利用标准差椭圆、自然断点分级法、Dagum基尼系数分析山东省农业生态效率空间演化趋势及空间发展差异,最后利用OLS回归分析山东省农业生态效率影响因素。整体来看山东省农业生态效率有了显著提升,省域内达到了较高水平,但省内三大经济圈间及经济圈内部各地市有显著差异,发展不均衡;农村电力设施、农村水利设施、土地规模化水平对山东省整体农业生态效率有显著促进作用,工业化水平、财政支农力度、农业生产技术水平对山东省整体农业生态效率具有显著抑制作用;此外各因素对山东省三大经济圈农业生态效率的影响存在差异,具有明显的区域异质性。

网红打卡点图片能刺激乡村旅游游客出游意愿吗?——“封闭代表圈”理论的验证

网红打卡点图片本质上是“封闭代表圈”理论的现实应用,已成为乡村旅游刺激游客出游意愿的重要营销手段之一。文章基于刺激—个体—反应—结果(SOBC)模型,验证“封闭代表圈”理论在乡村旅游中的适用性。基于结构方程模型的实证结果表明,该理论同样适用于乡村旅游领域,网红打卡点图片的信息量、娱乐性、兴奋度和真实性可以显著提升游客出游意愿与图片分享意愿。此外,乡村旅游目的地品牌效应与适宜距离对出游意愿具有重要作用。但是,网红打卡点图片的刺激作用在自然景观类、人文景观类与休闲活动类乡村旅游目的地中存在差异。据此,文章为乡村旅游目的地管理者的网红打卡点营销提出可行性建议。

基于ISSA-LSTM模型的可再生能源电力需求预测

为了更精准地预测未来能源结构调整方向及成效,选用ISSA-LSTM组合预测模型对中国2023-2030年可再生能源的电力需求进行预测。首先,利用Circle混沌映射改进麻雀搜索算法(SSA)以提高搜索能力以及种群多样性;然后引入长短期记忆神经网络(LSTM)以有效捕捉可再生能源电力需求随机波动性和时序性;最后,通过ISSA-LSTM模型预测长期可再生能源的电力需求,验证测试集数据,并与其他传统模型进行对比。结果表明:ISSA-LSTM模型预测结果能够满足对可再生能源电力需求预测的精度要求;在未来2023-2030年可再生能源电力需求稳定,波动幅度不大,可达到全国用电量的1/3;利用Circle混沌映射改进策略能有效提升SSA寻优能力。与PSO算法相比,SSA算法寻找LSTM超参数最优解的能力更优,ISSA-LSTM模型预测可再生能源电力需求精度更高。

基于局部区域搜索的颗粒最小外接圆与最大内切圆优化算法

颗粒轮廓通常像素点数多、形状复杂,使得现有最小外接圆(minimum circumscribing circle,MCC)和最大内切圆(maximum inscribed circle,MIC)算法常因搜索点选择不当而导致算法无法收敛或者陷入局部最优。针对此问题提出了基于局部区域搜索(partial area search,PAS)的MCC与MIC优化算法。算法采用欧几里得距离变换(Euclidean distance transformation,EDT)获得中心点,根据此中心点划分不同的局部搜索区域,然后在局部区域中分别搜索MCC和MIC所需的候选点,最后通过计算分别得到需要的圆。在MCC计算中详细说明了通过两点直接确定MCC的方式,并在局部区域中优先选择最外围的点作为构建初始圆的依据。通过这种方式,部分颗粒无需迭代即可获得MCC,消除了由于搜索点选择不合适而导致的出错问题,同时减少了后续的迭代计算需求。MIC计算首先在局部区域中搜索候选点,然后利用Voronoi图计算MIC,免去了迭代步骤,提高了计算精度和效率。计算出MCC与MIC后,即可计算出颗粒的不规则度。通过对已有数据集的对比分析和实际颗粒的实验数据,证明了优化算法的稳定性和精确性,并具有较高的计算效率,同时适用于低分辨率的颗粒图像。研究结果为颗粒形态的分析提供了一种有效的优化算法。

生活圈视角下河谷型城市生活便利度评价——以兰州市为例

城市公共服务设施配置直接影响城市居民生活幸福感。以兰州市中心城区为例,基于生活圈视角,运用层次分析法与网络数据模型构建方法,计算兰州市中心城区生活便利度指数,同时采用多尺度地理加权回归模型对其影响因素及空间异质性进行分析。结果表明:公共服务设施在各区总体呈现“中心良好,外围依次递减”的布局模式;从城市社区便利度指数来看,西固区的便利度指数最高,其次依次为七里河区、城关区和安宁区;GDP、建筑密度和距公交的最短距离是影响城市社区生活便利度的主要因素。研究为兰州市中心城区公共服务设施配置等专项规划提供科学依据,并为同类型城市提供借鉴。

中部经济圈城市住宅价格空间分异格局及影响因素

以中部经济圈36个地级市住宅价格为研究对象,重点分析各城市住宅价格的空间分异格局及影响因素。采用空间自相关分析及空间热点分析等方法对城市住宅价格空间分异格局进行了探讨,基于供需理论(S-D)和特征价格理论(Hedonic),从土地与住宅供应、居民收入水平、人口规模、自然环境特征、经济发展水平和基础设施配套水平等6个维度建立城市住宅价格空间分异格局初选影响因素,通过相关性检验与多重共线性检验筛选出主要影响因素,并建立地理加权回归模型探讨各因素对城市住宅价格的作用差异。结果表明:中部经济圈的城市住宅价格在空间上表现为东北部高、西南部低,且呈现出空间聚集性和行政等级性;城市土地与住宅供给、城市人口规模与需求潜力和城市经济发展特征均对城市住宅价格空间分异产生重要影响。