Analysis of handoff in distributed mobile communications system based on remote antenna unit selection

A remote antenna unit （RAU） selection model is presented, and two kinds of handoffs, intra-cell handoff （HO） and inter-cell HO, are defined in distributed mobile communications systems （DAS）. After that, an inter-cell HO model is proposed, in which the average power of the active set （AS） is used to predict the position of the mobile station （MS）. The total power of the AS and the handoff set （HOS） are utilized to determine whether an inter-cell HO is necessary. Furthermore, the relationship between HO parameters and performance metrics is studied in detail based on RAU selection. Simulation results show that both the intra-cell HO and the inter-cell HO can achieve oerfect performance by aoprooriate settings of HO parameters.

Receiving antenatal care via mobile clinic: Lived experiences of Jordanian mothers

Objective To understand the perceptions of pregnant Jordanian women who received antenatal care via mobile clinic,and to contribute new insights into the experiences of these mothers and how they evaluated the services that were available.Methods Ten Jordanian mothers who had received antenatal care at a mobile clinic discussed their experiences in semi-structured,audiotaped interviews in a study that adopted a qualitative research design.The analysis was done using interpretative phenomenological analysis.Results Three main themes were identified:Being informed about the medical campaign or missing the opportunity of being informed;The experience of receiving antenatal care was wonderful,although there was only one thing lacking;and they safeguard our life and take any opportunity to educate us.Conclusion Data indicate that the mothers were largely satisfied with most facets of the antenatal care services they had received at the mobile clinics.However,while services are generally well received,there are clear opportunities for ameliorating the quality of services provided.For mothers living in remote,deprived areas,outreach is not just an‘optional extra’but rather an essential service.

Optimal use of mobile cooling units in a deep-level gold mine

The South African gold mining sector remains a significant contributor to the country’s economy.Facing several challenges that hinder the realisation of South Africa’s full mineral potential,the sector’s sustainability and profitability can be enhanced through implementing operational improvement measures.Mobile cooling units(MCUs)were identified as a potential focus area for operational improvement.MCUs are used as tertiary or in-stope cooling in hot underground workings.In this paper,a method was presented to characterise the performance of existing MCUs based on three key performance indicators(KPIs),namely,the wet-bulb temperature ratio(WTR),efficiency and position.Optimisation strategies were then elected and implemented based on these KPIs.The implementation of this method in a South African gold mine attained a reduction in pumped water volumes,reduced operating costs through electricity cost savings and improvements in underground ventilation air temperatures.

Study of the intensive care unit activity scale in the early rehabilitation of patients after direct cardiac surgery

BACKGROUND Direct cardiac surgery often necessitates intensive post-operative care,and the intensive care unit(ICU)activity scale represents a crucial metric in assessing and guiding early rehabilitation efforts to enhance patient recovery.AIM To clarify the clinical application value of the ICU activity scale in the early recovery of patients after cardiac surgery.METHODS One hundred and twenty patients who underwent cardiac surgery between September 2020 and October 2021 were selected and divided into two groups using the random number table method.The observation group was rated using the ICU activity scale and the corresponding graded rehabilitation interventions were conducted based on the ICU activity scale.The control group was assessed in accordance with the routine rehabilitation activities,and the postoperative rehabilitation indexes of the patients in both groups were compared(time of tracheal intubation,time of ICU admission,occurrence of complications,and activity scores before ICU transfer).The two groups were compared according to postoperative rehabilitation indicators(time of tracheal intubation,length of ICU stay,and occurrence of complications)and activity scores before ICU transfer.RESULTS In the observation group,tracheal intubation time lasted for 18.30±3.28 h and ICU admission time was 4.04±0.83 d,which were significantly shorter than the control group(t-values:2.97 and 2.038,respectively,P<0.05).The observation group also had a significantly lower number of complications and adverse events compared to the control group(P<0.05).Before ICU transfer,the observation group(6.7%)had few complications and adverse events than the control group(30.0%),and this difference was statistically significant(P<0.05).Additionally,the activity score was significantly higher in the observation(26.89±0.97)compared to the control groups(22.63±1.12 points)(t-value;-17.83,P<0.05).CONCLUSION Implementation of early goal-directed activities in patients who underwent cardiac surgery using the ICU activity scale can promote the recovery of cardiac function.

Economic Evaluation of Mobile Mental Health Units in Greece: The Case of Cyclades Islands

Background: In Greece, the provision of mental health services is limited to people residing in rural and remote areas. The operation of Mobile Mental Health Units (MMHUs) has been introduced in the Cyclades islands. It is an innovative policy intervention that has been shown to be effective and efficient internationally. Objective: The aim was to evaluate the operation of MMHUs in the Cyclades islands based on real-world evidence (RWE), from a societal perspective. Methods: A cost-effectiveness analysis was performed where outcomes and costs were elaborated and classified based on two comparators, 1) with MMHUs’ operation and 2) without MMHUs’ operation. Clinical primary outcomes were based on RWE data and were elaborated for the Disability-Adjusted Life Years (DALYs) values calculation, for a 12 months’ time horizon. Data descriptive statistics were performed with SPSS Statistics 22.0. Direct medical, non-medical and indirect costs were incorporated. Unit costs and monetary values were extracted from published data. Sensitivity analysis was undertaken to test the robustness of the results. Results: The operation of MMHUs in the Cyclades islands led to an incremental cost of €12,250.78 per DALY averted. A substantial higher increase is observed in the direct non-medical costs of the non-MMHUs’ operation where patients had to pay approximately €2,602 per capita annually for their transportation and accommodation due to hospitalization and outpatient care. Informal care expenses are 3 fold increasing in the non-MMHUs’ operation arm. Both direct non-medical and informal care costs correspond to high out of pocket payments totally covered by the patients. The sensitivity analyses demonstrated that the decision does not change when we varied the unit costs by ±10%. Conclusions: The operation of MMHUs appears to be a cost-effective option for treating patients with mental disorders in remote areas and islands in Greece. MMHUs appear to overcome the existing NHS structural inefficiencies by minimizing public expenditures and patients’ income losses by preventing and improving their mental health status.

Design of a Mobile Mechanism for Missing Miner Search Robots in Underground Mines

A mobile mechanism with four tracked-units for a missing miner search robot (MMSR) is presented, with a design based on the terrain features and atrocious environment of an underground mine. Its structure and working prin- ciple is discussed. The four tracked-units are controlled independently and driven cooperatively. By means of two DC motors being controlled respectively, one tracked-unit can accomplish two types of driving mode: tracked travel and in- tegral unit legged rotation (IULR), forming a track-legged compound function mechanism. Its capabilities of surmount- ing obstacles and its toppling stability in underground mines have also been analyzed. The results show that the mobile mechanism can directly surmount an obstacle of the height less than the length of one tracked-unit and get across a raceway with a span less than the length of one tracked-unit by using tracked travel and IULR. Its unstable slope angle is 51.3°. Toppling stability is determined by its structural size, moving direction and slope angle. IULR of four tracked-units can adjust the robot’s posture and then enhance toppling stability or assist in surmounting obstacles. Its track-legged compound function mechanism makes it suitable for working in underground mines.

Early mobilization for mechanically ventilated patients in the intensive care unit:a systematic review and meta-analysis

Background: Early mobilization(EM) is a regimen that was carried out by physiotherapists in a relatively early stage. It has been investigated by an increasing number of researchers. However, there has not been a meta-analysis concerning whether EM could benefit the clinical outcomes of critically ill patients requiring mechanical ventilation(MV). The present systematic review aims to evaluate the effect of EM compared with immobilization for mechanically ventilated patients.Methods: A computerized literature search was performed in six databases for related articles from inception to June 2017. We included randomized controlled trials and controlled clinical trials and used the Physiotherapy Evidence Database scale to assess the quality of included studies. Primary outcomes were measures of muscle function, duration of MV, and incidence of mortality.Secondary outcomes were adverse effects and length of stay(LOS) in intensive care unit(ICU) and hospital.Results: Eight trials were included; of those, only one study without standard EM reported that the intervention was invalid to improve the outcomes. The result of meta-analysis indicated that EM shortened the duration of MV; however, it had no positive effect on mortality and LOS in ICU.Conclusions: This review suggests that EM improves the muscle function and ventilation duration. Further research highlighting standard intervention and specific groups is needed.

Mobile medical applications’state quo and underlying barriers:review of literature

Objective:To explore the current development and challenges regarding mobile medical applications(mmAPPs),so as to provide reference for application function elevation and quality improvement.Methods:We retrieved literature databases like Web of Science,PubMed,China National Knowledge Infrastructure,Wanfang,China Biomedical Network,time limit was from January 1,2010 to December 31,2021,and restricted to the Chinese or English language.Results:This study concluded with the following six aspects:Domestic and foreign development of mmAPP,reminder function,barriers and challenges(low quality;slow update rate;lack of standard evaluation tool or criterion),privacy and safety concerns,adverse drug event report state(low report rate-related reasons,different countries’report policies),and current hindrances in the progression(economic worries;personal education level;acceptance and study of technology;rural districts,and low-income countries).Conclusions:We should focus on the application’s quality elevation rather than quantity,pay more attention to patients’adverse drug event reports,privacy and safety,and place emphasis on rural districts and low-income countries.

Effect of the Early Introduction of Mild Mobilization Performed by Nurses on the Recovery of Patients in the Intensive Care Unit

Rationale: Recent studies have reported the effectiveness of the early introduction of rehabilitation for preventing muscle weakness in patients in the intensive care unit (ICU). The early introduction of full-scale rehabilitation by a physical therapist is difficult in some cases because of disease severity and/or patient conditions. However, mild mobilization by a nurse (MMN), as a part of standard care performed, may have a positive effect on patient recovery. We examined the effect of the early introduction of MMN on the recovery of patients in the ICU. Methods: We retrospectively examined patients admitted to Niigata University Hospital’s ICU during between April 2014 and March 2015 who were receiving mechanical ventilation for 7 days or more. Patients were divided into two groups according to the date of initiation of MMN: group L comprised patients for whom MMN was started after 72 hours and group E comprised patients for whom MMN was started within 72 hours after ICU admission. The data were analyzed using the Fisher test, Mann-Whitney U test, and Wilcoxon test. Statistical significance was defined as P Results: Sixty-three patients were included: 42 patients in group L and 21 in group E. There was no significant difference between the two groups in patients’ background, including the type of illness, steroid use, presence of sepsis or diabetes, and sequential organ failure assessment (SOFA) score on ICU admission;however, the SOFA score at ICU discharge was significantly decreased in group E compared to that in group L (6.21 versus 4.30;P = 0.034). Conclusion: Our results indicate that MMN may reduce disease severity if started within 72 hours after ICU admission.

早期目标导向活动对机械通气患者短期预后的应用研究

目的探讨早期目标导向活动在重症加强护理病房(ICU)机械通气患者中应用的短期预后效果。方法采用便利抽样法,选取76例机械通气患者作为研究对象,以病区为单位,入住ICU A区的38例患者为对照组,实施常规康复护理方案;入住ICU B区的38例患者为实验组,采用Richmond躁动-镇静评分、标准化5问题问卷、ICU活动量表评估研究对象镇静程度、配合程度及ICU活动能力,实施早期目标导向活动。观察2组患者肌力及握力水平、ICU活动能力、机械通气时间及ICU住院时间。结果干预第4 d及出科前实验组肌力、握力及出科前的活动能力得分高于对照组(P<0.05);实验组机械通气时间及ICU住院时间短于对照组(P<0.05)。结论早期目标导向活动有助于提高机械通气患者的肌力、活动能力,缩短ICU停留时间,改善患者短期预后。未来可进一步随访,探究早期目标导向活动的远期效果,为早期目标导向活动的推广及应用提供临床指导。

基于改进浮动单元的城市职住平衡时间尺度估计——以广州市为例

已有研究对城市职住平衡的测度往往存在可塑性面积单元问题,且忽略了交通网络在职住联系中的媒介作用。提出一种改进的浮动单元法,构建基于道路和城市轨道交通网络的数据集,以时间为职住分析尺度生成浮动单元,运用手机信令数据对职住平衡进行测度。以广州市为例,对就业中心和居住区的职住平衡时间尺度进行估计。研究发现:广州市中心城区职住平衡时间尺度分布呈圈层式空间特征,职住平衡时间尺度从一级就业中心向外围先减小再增大;城市轨道交通缩小了就业中心的职住平衡时间尺度;一级、二级(不处于一级就业中心的辐射范围内)和三级就业中心的职住平衡时间尺度分别为32~40 min、14~28 min和10~20 min,而居住组团的职住平衡时间尺度主要依附于就业中心且受到城市轨道交通的影响。最后,提出在合适的时间尺度下对职住空间结构进行评估和优化住房和就业等资源配置,并重视城市轨道交通对职住空间结构的影响。

防爆5G微基站研发及其在石化企业的应用

随着无线通信技术、超大规模集成电路技术的发展,无线移动通信在数年内从2G模拟阶段到3G、4G、5G数字阶段的数次跃迁,目前5G无线移动通信网络实现了民用场景全面覆盖。但是在油气开采、炼油、化工等易燃易爆工业现场受防爆条件的限制,5G无线移动通信网络覆盖推进困难,边缘计算、网络切片、物联网等新技术、新应用无法实现部署。本文所述通过研发设计防爆5G微基站,实现在工业危险环境部署5G无线移动通信网络,推进新技术在石化企业落地应用,助力石化企业提质增效,为我国石化行业的智能化、智慧化提供高效、稳定的无线网络保障。

我军机动医疗救护分队阶梯式岗位评价的质性研究

目的 探索机动医疗救护分队岗位评价指标构成要素,为实现科学、合理的岗位管理提供依据。方法采用目的抽样法在军队医院、研究院所等选取8名相关领域的专家作为研究对象,采用半结构式访谈法调查机动医疗救护分队岗位评价指标要素,借助NVivo12.0软件对访谈内容进行整理、编码、分类、归纳、提炼主题。结果 归纳出岗位准入、岗位技能、岗位强度、岗位环境、岗位职责5个层面,提炼出“岗位要求—岗位特性—岗位意义”阶梯式岗位评价模型。结论 在进行岗位评价时,应注重考察分队人员的能力和素质、岗位的责任和特性,为公正评价岗位、科学管理人员提供基础。

基于i-PARIHS模型的ICU机械通气病人早期目标导向活动审查指标的制定及障碍因素分析

目的:评估重症监护病房(ICU)机械通气病人早期目标导向活动相关证据的应用现状,分析其障碍因素及促进因素,为证据的临床转化提供参考。方法:汇总证据,确立审查指标,以健康服务领域研究成果应用的整合性行动促进框架(i-PARIHS)模型为理论框架对基线审查中临床依从率较低的指标进行障碍因素和促进因素分析,制订应对策略。结果:10条审查指标执行率均<60%,其中4条指标执行率为0。从变革、变革接受者、组织环境3个方面总结10个审查指标的障碍因素、促进因素及对策。结论:ICU机械通气病人早期活动最佳证据与现行临床护理实践尚存在较大差距,全面、科学地评估临床实践中的障碍与促进因素,制订相应变革策略,有助于推进证据在临床中的应用。

基于因子图的多传感器融合定位方法

针对移动机器人在室内环境中使用单一传感器或松耦合定位存在定位精度低和鲁棒性不足的问题,提出一种基于因子图的多传感器紧耦合定位算法。该算法分别接收来自惯性测量单元(IMU)、轮式编码器和2D激光雷达的数据,并构建IMU预积分因子、轮式里程计因子、位姿先验因子以及激光里程计因子;通过因子图对这些因子进行增量优化后输出得到移动机器人的状态信息,同时实时估计IMU的漂移量并进行校正。实验结果表明,无论是在未知环境还是已知环境下,该定位算法都可以有效提高移动机器人的定位精度和鲁棒性。

基于CNN-GRU的移动APP流行度预测模型

移动APP流行度预测对应用推荐、广告投放等意义重大。但是现有方法大多依赖手工特征工程,工作量大且效率较低。为此,提出一种基于深度神经网络的移动APP流行度预测模型。利用最大信息系数进行特征相关性分析以确保特征选取有效性,结合历史流行度特征,通过门控循环单元(gate recurrent unit,GRU)和注意力机制构建长期演化模型来推演发展趋势,基于多尺度卷积神经网络(convolutional neural networks,CNN)和注意力机制构建短期波动模型以实现预测动态优化,结合其他重要特征利用GRU和注意力机制建立多因素影响模型。通过时间注意力模块将上述模型融合,实现流行度预测。实验结果表明,所提模型在移动APP流行度预测方面相对更为精准有效。

移动卒中单元在急性缺血性脑卒中静脉溶栓患者中的应用效果

目的探讨移动卒中单元在急性缺血性脑卒中患者静脉溶栓中的应用效果。方法选取2021年3月至9月聊城市人民医院脑科医院卒中中心收治的98例急性缺血性脑卒中静脉溶栓患者作为研究对象,将其分为观察组(43例)和对照组(55例),应用移动卒中单元进行静脉溶栓的患者为观察组,使用传统溶栓模式进行静脉溶栓的患者为对照组。比较两组患者静脉溶栓流程中各时间节点:入院/上车至静脉溶栓时间、发病至CT检查完成时间、发病至静脉溶栓时间、呼叫120至静脉溶栓时间,两组患者静脉溶栓后7、14 d的美国国立卫生院卒中量表(NIHSS)评分,溶栓后90 d的改良Rankin量表(mRS)评分,溶栓后90 d神经功能转归良好(mRS评分0~2分)率。结果观察组患者入院/上车至静脉溶栓时间、发病至CT检查时间、发病至静脉溶栓时间和呼叫120至静脉溶栓时间均短于对照组,差异有统计学意义(P<0.05)。两组患者静脉溶栓后7、14 d的NIHSS评分均低于本组溶栓前,差异有统计学意义(P<0.05);对照组静脉溶栓后14 d的NIHSS评分与溶栓后7 d比较,差异无统计学意义(P>0.05),观察组患者静脉溶栓后14 d的NIHSS评分低于本组溶栓后7 d,低于对照组溶栓后14 d,差异有统计学意义(P<0.05)。两组患者溶栓后90 d的mRs评分均低于本组溶栓前,差异有统计学差异(P<0.05)。两组患者静脉溶栓后90 d的mRs评分、功能转归良好率(mRs评分0~2分)比较,差异无统计学意义(P>0.05)。结论运用移动卒中单元对急性缺血性脑卒中患者进行救治,可以明显缩短入院/上车至静脉溶栓时间、发病至CT检查时间、发病至静脉溶栓时间以及呼叫至静脉溶栓时间,提高救治率,改善患者症状,但对于急性脑卒中患者静脉溶栓的救治效果还需要多中心大样本研究进一步验证。

基于循证的ICU机械通气病人目标导向早期活动方案的构建

目的:构建基于循证的重症监护室(ICU)机械通气病人目标导向早期活动方案。方法:基于循证的方法,以目标导向为理论基础,形成ICU机械通气病人目标导向早期活动方案初稿,通过德尔菲法对初稿进行修订,最终形成ICU机械通气病人目标导向早期活动方案。结果:形成了包括早期活动原则、早期活动前准备、早期活动的评估、早期活动的实施、早期活动安全标准及早期活动效果评价指标6项一级指标的ICU机械通气病人目标导向早期活动方案,2轮专家函询问卷回收率分别为95.0%和100.0%,专家权威系数分别为0.94和0.96,变异系数均为0.00~0.11,指标重要性及可操作性的肯德尔和谐系数检验均P<0.001。结论:构建的ICU机械通气病人目标导向早期活动方案具有较好的科学性、可操作性,可为医务人员针对ICU机械通气病人开展早期活动提供参考。

移动式钻井平台零排放技术浅析

近年来,随着全民环保意识不断增强,政府相继出台了系列环保法规,加强对污染物的排放控制。根据渤海地区生态红线保护要求,以实现移动式钻井平台作业过程零污染为目标,定量分析了海洋钻探开发过程中固体污染物、生活污水、工业污水等排放量,优化钻井平台原液舱功能分布,校核了钻井平台结构强度与稳性,实现海洋钻探过程中的污染物零排放技术方案。相关技术成果已成功应用于多个钻井平台,可推广至同类大型海洋作业装备。

红柳林煤矿单驱分级破碎机的改造及应用

针对红柳林煤矿2PLF80/300单驱顺槽破碎机在检修时存在破碎机移出和复位耗费时间长、需要大量人力成本、存在一定的安全隐患等问题,结合现场实际情况,通过分析问题,提出对该破碎机的优化升级改造方案。生产实践表明:优化升级后的破碎机实现了“一键行走”,破碎机运行平稳可靠,整机性能达到最优状态,经济效益得到了显著提高。