LSTM-based lane change prediction using Waymo open motion dataset: The role of vehicle operating space

Lane change prediction is critical for crash avoidance but challenging as it requires the understanding of the instantaneous driving environment.With cutting-edge artificial intelligence and sensing technologies,autonomous vehicles(AVs)are expected to have exceptional perception systems to capture instantaneously their driving environments for predicting lane changes.By exploring the Waymo open motion dataset,this study proposes a framework to explore autonomous driving data and investigate lane change behaviors.In the framework,this study develops a Long Short-Term Memory(LSTM)model to predict lane changing behaviors.The concept of Vehicle Operating Space(VOS)is introduced to quantify a vehicle's instantaneous driving environment as an important indicator used to predict vehicle lane changes.To examine the robustness of the model,a series of sensitivity analysis are conducted by varying the feature selection,prediction horizon,and training data balancing ratios.The test results show that including VOS into modeling can speed up the loss decay in the training process and lead to higher accuracy and recall for predicting lane-change behaviors.This study offers an example along with a methodological framework for transportation researchers to use emerging autonomous driving data to investigate driving behaviors and traffic environments.

HiLog:OpenHarmony的高性能日志系统

日志是计算机系统中记录事件状态信息的的重要载体,日志系统负责计算机系统的日志生成、收集和输出.OpenHarmony是新兴的、面向全设备、全场景的开源操作系统.在所述工作之前,包括日志系统在内OpenHarmony有许多关键子系统尚未构建,而OpenHarmony的开源特性使第三方开发者可以为其贡献核心代码.为了解决Open Harmony日志系统缺乏的问题,主要开展如下工作:(1)分析当今主流日志系统的技术架构和优缺点;(2)基于OpenHarmony操作系统的异构设备互联特性设计HiLog日志系统模型规范;(3)设计并实现第1个面向OpenHarmony的日志系统HiLog,并贡献到OpenHarmony主线;(4)对HiLog日志系统的关键指标进行测试和对比试验.实验数据表明,在基础性能方面,HiLog和Log的日志写入阶段吞吐量分别为1500 KB/s和700 KB/s,相比Android日志系统吞吐量提升114%;在日志持久化方面,HiLog可以3.5%的压缩率进行持久化,并且丢包率小于6‰,远低于Log.此外,HiLog还具备数据安全、流量控制等新型实用能力.

Open Gateway在运营商行业的应用前景与商业分析

网络能力开放是5G时代重要的商业模式之一。开放式网关(Open Gateway)是一种新型的通用网络应用程序可编程接口框架,5G引入Open Gateway可实现通信网络平台化,为开发者和云服务提供商提供对运营商网络的通用访问接口。通过分析Open Gateway技术原理、架构特点和试用案例,研究开源网关计划在无线网中的应用潜力与商业前景,并介绍了运营商典型的Open Gateway方案,为组建可互操作的、直观的和可编程的高度开放式5G网络提供借鉴。

LXI instrument development platform based on an open embedded operating system

This paper introduces the architecture and components of LXI instrument development platform based on an open embedded operating system,which is a modular and configurable platform.The platform is a total solution to develop LXI instrument modules and systems.On the other hand,it also supports other types of instrument development.This is a generic and efficient platform.At the end,this paper addresses the technical tends, challenges,and recormnends solutions.

Capacity Openness Boosts Digitization Transformation of Telecom Operators

With the emergence of digital transformation success stories,more and more enterprises are launching digital solutions to improve business efficiency or achieve optimal revenue growth.The traditional communication market tends to be saturated,and the digital transformation of telecom operators is imminent.This article combining the development trend of telecom operators’product business and the application situation of the pilot summarizes the innovative application categories that telecom operators continue to launch based on their own advantages and in response to the needs of the industry.This article focuses on the transformation of security capabilities in communication services,big data,Internet of Things,artificial intelligence,unified authentication and network information security,and deeply analyzes the business characteristics and application modes from the aspects of resource integration,open platform construction,new connection construction,and innovative business development.This article puts forward suggestions for the security development of telecom operators,and provides basic research content for the subsequent research on the innovative application of telecom operators’capability openness.

Combined urethral and suprapubic catheter drainage improves post operative management after open simple prostatectomy without bladder irrigation

AIM To compare outcomes after open simple prostatectomy without bladder irrigation, in subjects drained by combined 2-way urethral catheter and suprapubic catheter(SPC) vs those drained by 2-way urethral catheter only.METHODS A total of 84 participants undergoing Freyer's simple prostatectomy over an 18-mo period were randomized into 2 groups(n=42). Subjects in group 1 were managed with 2-way urethral catheter and in situ 2-way SPC while subjects in group 2 had a 2-way urethral catheter drainage only. In group 1 subjects, the SPC was spigotted and only used for drainage if there was clot retention. The primary outcomes were number of clot retention episodes, and number of clot retention episodes requiring bladder syringe evacuation. Other secondary outcomes evaluated were blood loss, requirement of extra analgesics, duration of surgery, hospital stay and presence or absence of post-op complications. RESULTS The mean age in the groups was 65.7(± 7.6) in group 1 vs 64.8(±6.8) in group 2.The groups were similar with respect to age, prostate specific antigen, prostate volume, blood loss, duration of surgery, blood transfusion and overall complication rate. However statistically significant differences were observed in clot retention episodes between group 1 and 2:0.8(±1.5)vs3.5(±4.4), P<0.000, clot retention episodes requiring evacuation with bladder syringe 0.4(± 0.9) vs 2.6(± 3.8), P = 0.001, requirement of extra analgesics 0.4(±0.5)vs4.0(±1.5), P<0.000 and duration of admission 8.6d(± 1.2) vs 7.3 CONCLUSION Subjects drained with a combination of urethral and SPCs have fewer clot retention episodes and reduced requirement of extra analgesics but slightly longer hospital stay.

Ferroresonance at Open Phase Operating Conditions of Power Transformers

The reliability of electric supply to consumers is one of the most important factors that determine the requirements imposed on modem utility companies. This paper presents the results of investigation by computer software of the overvoltages resulting from a ferroresonance conditions in MV networks at open phase operating condition with and without connection to earth on source and load sides of distribution transformer. This overvoltage may reach 4.2 pu on one of the HV side of transformer unswitched phases. The results of the study show that ferroresonance overvoltage may be controlled by replacing fuses with circuit breakers on HV side to ensure switching-off all phases. Insertion of resistor or reactor in the neutral of source and loadsides of the transformer with 5% active load will help in suppressing overvoltages.

Application of Opening and Closing Morphology in Deep Learning-Based Brain Image Registration

In order to improve the registration accuracy of brain magnetic resonance images(MRI),some deep learning registration methods use segmentation images for training model.How-ever,the segmentation values are constant for each label,which leads to the gradient variation con-centrating on the boundary.Thus,the dense deformation field(DDF)is gathered on the boundary and there even appears folding phenomenon.In order to fully leverage the label information,the morphological opening and closing information maps are introduced to enlarge the non-zero gradi-ent regions and improve the accuracy of DDF estimation.The opening information maps supervise the registration model to focus on smaller,narrow brain regions.The closing information maps supervise the registration model to pay more attention to the complex boundary region.Then,opening and closing morphology networks(OC_Net)are designed to automatically generate open-ing and closing information maps to realize the end-to-end training process.Finally,a new registra-tion architecture,VM_(seg+oc),is proposed by combining OC_Net and VoxelMorph.Experimental results show that the registration accuracy of VM_(seg+oc) is significantly improved on LPBA40 and OASIS1 datasets.Especially,VM_(seg+oc) can well improve registration accuracy in smaller brain regions and narrow regions.

北京某公立医院新院区筹备与初期运营实践

建设新院区是大型公立医院的重要发展战略之一,可以有效促进医疗资源扩容和合理布局,满足群众对优质医疗服务的需求。新院区的开办筹备和初期运营管理是其平稳运行、高质量发展的起点。本文介绍了北京某大型公立综合三甲医院新建院区开办筹备和初期运营管理的实践经验,为公立医院新院区的建设开办和多院区运营管理提供参考。

腹腔镜Lich-Gregoir术与开放Cohen术治疗儿童原发性膀胱输尿管反流的疗效分析

目的探讨腹腔镜Lich-Gregoir术与开放Cohen术在儿童原发性膀胱输尿管反流(vesicoureteral reflux,VUR)治疗中的应用价值。方法本研究为回顾性研究,将2018年6月至2022年6月首都医科大学附属北京儿童医院接受手术治疗的150例原发性VUR且资料完整的患儿纳入研究。按照手术方式的不同分为腹腔镜Lich-Gregoir组(n=69)和开放Cohen组(n=81);根据VUR侧别的不同以及术中是否行输尿管裁剪,将腹腔镜Lich-Gregoir组进一步分为单侧未裁剪输尿管腹腔镜Lich-Gregoir组(A组,n=33)、双侧未裁剪输尿管腹腔镜Lich-Gregoir组(C组,n=16)、单侧裁剪输尿管腹腔镜Lich-Gregoir组(E组,n=12)、双侧裁剪一侧输尿管腹腔镜Lich-Gregoir组(G组,n=8),开放Cohen组进一步分为单侧未裁剪输尿管开放Cohen组(B组,n=30)、双侧未裁剪输尿管开放Cohen组(D组,n=20)、单侧裁剪输尿管开放Cohen组(F组,n=18)、双侧裁剪一侧输尿管开放Cohen组(H组,n=13)。将8个亚组配为4对(A组&B组/C组&D组/E组&F组/G组&H组),比较各组性别、年龄、症状、侧别、反流程度、术中以及术后情况。结果以上4对进行组内比较,每对当中的两组在性别、年龄、症状、侧别、反流程度方面差异均无统计学意义(P>0.05)。A组、B组的住院时间分别为(6.78±1.76)d和(10.43±1.25)d;C组、D组的住院时间分别为(7.12±2.02)d和(11.05±1.82)d;E组、F组的住院时间分别为(8.83±1.33)d和(11.11±1.27)d;G组、H组的住院时间分别为(8.62±1.59)d和(11.46±1.39)d;差异均有统计学意义(P<0.05)。A组、B组的手术时间分别为(78.90±12.54)min和(85.60±13.11)min;C组、D组的手术时间分别为(89.43±12.37)min和(99.55±15.14)min;差异均有统计学意义(P<0.05)。术后6~12个月复查VCUG,共9例出现高级别反流;其中腹腔镜Lich-Gregoir组7例,开放Cohen组2例;2例再次行腹腔镜Lich-Gregoir术,7例行开放Cohen手术,术后均恢复良好。结论腹腔镜Lich-Gregoir术和开放Cohen术均为治疗原发性VUR的有效方法。腹腔镜Lich-Gregoir术可以保持输尿管和膀胱的正常生理走行,同时缩短患儿住院时间。对于术中未裁剪输尿管者,腹腔镜Lich-Gregoir术可以缩短手术时间。

政务数据开放运营制度的目标偏离及纠偏

政务数据开放之价值目标,应定位于在公平合理条件下保障多元的市场和社会主体获取和利用公共数据,从而推动政务数据利用的经济、政治效益和社会福利的整体增长。国家应协调政务数据开放的多元价值目标,为社会主体公平利用政务数据提供实质条件,形成一套兼顾多元利益、具有系统性和整体性的开放、运营和管理体制。当前一些地方规定政务数据归政府所有,进而采取“国有资产管理式”策略进行授权运营的做法,缺乏法理层面的依据,在制度功能上也将引发“与民争利”和“地方数据壁垒”的双重负面效果,亟需予以纠偏。政务数据授权运营制度的再建构,需要考虑政务数据开放的价值目标,从而匹配相应的手段选择。应考虑建立“二元授权运营机制”:一是在数据基础设施层面,完善“公私合作履职式”的授权运营模式,避免过度商业导向和政务数据资产化的法律风险,增强政务数据开放的便捷性与数据生态的构建;二是在具体政务数据的管制策略层面,将侧重政务数据资源资产化思路的“国有资产管理式授权运营”,转变为基于风险防控与市场秩序而审慎限定数据利用主体资格的授权运营模式,从而保障政务数据利用的公平竞争,提升政务数据利用的社会效益。

露天矿山无人驾驶编组运行关键技术

分析了当前国内外露天矿山智能化发展现状;介绍了无人驾驶编组运行阶段关键技术,包括:构建智能化管理与监控系统、无人驾驶改造、数据实时传输,以及构建协同作业管理系统和无人运输安全防护网,从而实现露天矿山装、运、排联合作业智能化。结果表明:逐步完善监控、数据处理、路径规划、防护措施,可保障无人驾驶编组运行稳定推进,为消除人员不安全行为、保障职工生命健康、降本增效提供现实可行性,从而实现智能化露天矿山安全稳定发展目标。

大型仪器设备分层化与特征化运行管理探索

随着高校和科研院所大型仪器设备数量及其功能复杂性的增加,运行管理模式需持续创新与优化,该文基于网络共享平台的运行管理模式和土壤与环境研究领域的测试特征,对大型仪器设备的运行管理模式进行了探索。根据大型仪器设备运行特点,该文将仪器划分为常规型、环节型、耗时型、高难型等4种类型,分别采用“专职人员”“专职人员培训-操作视频-送样人”“专职人员培训-送样人”“专职人员-送样人”等分层化模式进行运行管理,统计分析这些仪器的运行机时、操作故障、自然故障、维修情况、共享率、支撑成果等多个运行指标,结果均较为满意。该文提出的分层化与特色化大型仪器设备运行管理模式,可为大型仪器设备共享率与运行效率的提升提供参考。

三门峡水库控制运用方式的优化探讨

三门峡水库“蓄清排浑”运用为多沙河流的治理提供了宝贵经验,随着来水来沙情况的变化及对水库功能需求和对水库泥沙冲淤规律认识的深化,该运行方式亦在实践中不断调整和完善。为此,针对不同的典型年份设定集中敞泄与分段敞泄的敞泄排沙方案,采用一维非恒定水沙数学模型,对选取的2018~2019年丰水少沙年和2014~2016年枯水少沙年设定12种控制运用方案进行模拟,比较各方案下库区冲淤变化的优劣,据此选取适合三门峡水库的控制运用方式。结果表明,2018~2019年分段敞泄方案的冲刷效果优于集中敞泄方案,即使在后汛期的控制水位抬高至310 m,也能达到较好的冲刷效果;2014~2016年分段敞泄方案虽优于集中敞泄方案,但其冲刷主要集中于2014年汛期,2015、2016年整体呈淤积状态,综合考虑建议枯水少沙年份水库采用“泥沙年际调节”运用模式。

兆瓦级高效紧凑型核动力系统运行特性研究

为研究兆瓦级高效紧凑型核动力系统的运行特性,使用自主开发的热管堆瞬态分析程序TAPIRS(Transient Analysis code for heat Pipe and AMTEC power conversion space Reactor power System)和超临界二氧化碳布雷顿循环的瞬态分析程序SCTRAN/CO_(2)(Super Critical reactors Transient Analysis code/Carbon Dioxide)的耦合程序对其反应性、负荷、冷却水温度和流量等扰动进行了开环动态响应分析,并据此进行了控制系统设计。在此基础上,对线性变负荷、阶梯式变负荷以及甩负荷这三种变负荷运行工况进行了计算分析。结果表明:该核动力系统的转速对扰动的变化较为敏感,需要加以控制;低负荷下旁通会使压缩机流量上升,需对压缩机流量加以控制;系统在控制方案下能以6%FP(Full Power)·min^(−1)的速度实现0%~100%的负荷变动,且可以在任意负荷水平下运行;甩负荷下系统的波动时间变长,但是仍可达到新的稳态进行工作,且各参数处于安全范围内。本研究可为新型核动力系统的概念设计提供参考。

开放性手外伤术后感染危险因素及预测分析

目的探讨开放性手外伤术后感染危险因素并进一步分析相关因素风险预测临床效能。方法回顾性纳入2020年6月至2023年6月于本院行手术治疗开放性手外伤患者共106例,根据术后有无感染出现分组,比较感染组和无感染组临床特征资料,采用Logistics回归模型多因素分析评估开放性手外伤术后感染独立危险因素,描绘ROC曲线分析上述独立危险因素用于开放性手外伤术后感染风险预测临床效能。结果本研究纳入于本院行手术治疗开放性手外伤患者106例中出现术后感染11例,发生率为10.38%。单因素分析结果显示,年龄、吸烟、合并糖尿病、有无手术创面污染、受伤至手术时间、ASA评分、手术时间及是否行负压引流均可能与开放性手外伤术后感染发生有关(P<0.05)。Logistic回归模型多因素分析结果显示,年龄≥60岁、合并糖尿病、受伤至手术时间≥6 h、手术创面污染及未行负压引流均是开放性手外伤术后感染发生独立危险因素(P<0.05)。ROC曲线分析结果显示,年龄、是否合并糖尿病、受伤至手术时间、有无手术创面污染及有无行负压引流均可用于开放性手外伤术后感染发生风险预测,且上述指标联合预测效能显著优于单一指标(P<0.05)。结论开放性手外伤术后感染发生与年龄、是否合并糖尿病、受伤至手术时间、有无手术创面污染及有无行负压引流关系密切;而上述指标联合在预测开放性手外伤术后感染发生风险方面显示出更优临床效能。

基于CFD仿真的煤炭港口堆场垛位起尘特性研究

露天堆放的煤堆是煤炭码头堆场粉尘污染的主要来源。现行港口管理中针对各煤堆除尘作业的实施多依赖经验,未能充分考虑煤堆起尘区域的特点,造成抑尘效果不佳或资源浪费。对考虑外界影响因素变化下的煤炭码头露天堆场散逸性粉尘扩散进行定量研究,以中国北方某煤炭出口码头堆场为例,考虑在不同风速、多种风向入射角(0°、45°、90°)下的多组合试验工况,采用计算流体力学(CFD)软件对各煤堆粉尘扩散进行数值模拟,将具体起尘区域可视化,并计算得到煤堆表面的粉尘扩散量。针对性分析不同位置的煤堆起尘特点,可为相应条件下堆场除尘作业提供理论参考。

跨校区办学模式下科研仪器开放共享探索与实践

科研条件建设,尤其是大型科研仪器设备的装备与运行,是高校开展学科建设和科研创新的重要支持条件。在跨校区办学模式下,仪器设备的管理机制、技术开发与交流、技术管理人力等因素等均是直接影响高校大型仪器设备平台开放共享效率的关键因素。该文总结探讨了高校多个校区间大型仪器设备论证验收流程、信息互联建设、分级管理模式和多元化考核等开放共享机制,为跨校区办学的高校科研条件平台管理提供借鉴与参考。

基于Criminisi算法的四经绞罗纹样修复研究

文章针对古代罗织物受到诸多因素影响而产生破损、难以提取修复这一问题,提出了一种结合开运算和Criminisi算法的图像修复方法。收集具有规律性特征的四经绞罗传统纹样,用图谱分析法分析最具代表性的菱形纹,使用原算法和开运算改进过的Criminisi算法,对图像进行剪裁,得出掩膜,计算优先权后进行纹样填充,完成了四经绞罗规律型图样的数字化修复。结果表明,经过开运算改进的Criminisi算法弥补了原算法的不足,修复后的图像和原算法修复的相比更加清晰平滑,验证了此算法修复四经绞罗纹样的可行性与可信性,为罗织物的传承和修复提供了较为可靠的方法。

低空经济的内涵、特征和运行模式

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