Using IoT to Smart Security Door System with Face Tracking Camera

Security is a serious concern, whether it may be the security of assets, data and human life. Providing humans with security and safety for their belongings and items is an important need. A smart lock door project/ with different types of methods for entry, like fingerprint and authentication PIN code is suggested with an unnoticeable face tracking camera capturing a photo in case of error data entry. It is to be controlled via the user’s smartphone using Blynk with the implementation of IoT. This technology is made with two microcontrollers. ESP32 is used to control the solenoid lock, fingerprint sensor and keypad. ESP32-CAM is used to capture a photo and send it to the owner’s smartphone to be viewed on Telegram application. Many conclusions are extracted from system results, as well as suggested ideas for future work.

DUAL MODE WIDEBAND BAND-PASS FILTER WITH NOTCHED BAND FOR COMMUNICATION SYSTEM

This paper presents a planar microstrip wideband dual mode Band-Pass Filter(BPF) from 2 GHz to 3.4 GHz with a notched band at 2.62 GHz.The dual mode band-pass filter consists of a ring resonator with two quarter-wavelength open-circuited stubs at =90o and =0o,respectively.A square perturbation stub has been put at the corner of the ring resonator to increase the narrow stopbands and improve the performance of selectivity.By using a parallel-coupled feed line,a narrow notched band is introduced at the required frequency and its Fractional BandWidth(FBW) is about 5%.The proposed filter has a narrow notched band and a wide pass-band with a sharp cutoff frequency characteristic,the attenuation rate for the sharp cutoff frequency responses is 297.17 dB/GHz(cal-culated from 1.959 GHz with-34.43 dB to 2.065 GHz with-2.93 dB) and 228.10 dB/GHz(calculated from 3.395 GHz with-2.873 dB to 3.507 GHz with-28.42 dB).This filter has the advantages of good insertion loss in both operating bands and two rejections of greater than 16 dB in the range of 1.59 GHz to 1.99 GHz and 3.49 GHz to 3.98 GHz.Having been presented in this article,the measurement results agree well with the simulation results,which validates our idea.

The Conceptual Design Experience of Sea-Going Ships with Alternative Propulsion System, Equipped with Dual-Mode Contra Propeller

The paper presents a technical solution which provides energy saving at full speed, as well as duplication of screw propeller and main propulsion system incase it＇s out of order. The description of the corresponding device, designed for transport refrigerator ship, is shown as well as its location on board. Value of energy saving from the use of contra propeller is estimated. The results of the assessment required power to move the ship at low speed by the action of the contra propeller operating in the reactive mode are demonstrated. It is shown, that the ship equipped with the proposed device will get the additional class notation related to the redundancy or duplication of the propulsion system of Russian Maritime Register of Shipping.

Dual Mode-Multiple Output SEPIC Converter Integrated with Passive Ripple Cancelling Circuit for Standalone PV Energy Harvesting System

This document addresses an exhaustive standalone Photovoltaic (PV) energy harvesting system considering two crucial issues: system efficiency and cost effectiveness. It contributes a compact resolution with a combined feature of Dual Mode-Multiple Output (DMMO) associated with input ripple reduction technique. Control strategy incorporates with aspect of Maximum Power Point Tracking (MPPT) and output voltage levels regulation. A theoretical analysis is conducted to evaluate the effect of ripple current on PV power. Proposed dual mode converter achieves efficiency of 98.36% and 97.76% respectively for mode-1 and mode-2 operation. However, simulation is performed applying MATLAB/SIMULINK tools to analyze the feasibility of the recommended system.

Modeling of Ad-hoc and Infrastructure Dual Mode Mobile Networks

This paper investigates a mobile telecommunications system that supports both ad hoc and infrastructure mode operations. Based on analytic and simulation models, our study investigates how base station (BS) and ad hoc channel capacity, and the mobility and locality of mobile stations affect the performance of a dual mode system. We show that a dual mode system can significantly outperform a single mode (infrastructure) system when the degree of locality is high. Furthermore, a dual mode system can support much faster mobile users with less BS channels in comparison to an infrastructure mode system. Our study quantitatively identifies the threshold value for the number of ad hoc channels such that beyond this threshold, increasing ad hoc channel capacity will not improve the performance of a dual mode system. Keywords Ad-hoc - infrastructure - dual mode system Yi-Hung Chen received B.S. degree in 2001 and M.S. degree in 2003 of Computer Science and Information Engineering from National Chiao Tung University, HsinChu, Taiwan. He is an engineer of QUALCOMM CDMA technologies Taiwan.His research interests include wireless communication and ad-hoc networking.Hui-Nien Hung received the B.S. degree in mathematics from the National Taiwan University, Taipei, Taiwan, in 1989, the M.S. in mathematics degree from National Tsin-Hua University, Hsinchu, Taiwan, in 1991, and the Ph.D. degree in statistics from the University of Chicago, Chicago, IL, in 1996. He is a Professor at the Institute of Statistics, National Chiao Tung University, Taiwan.His current research interests include applied probability, financial calculus, bioinformatics, statistical inference, statistical computing, and industrial statistics. Yi-Bing Lin (M’96-SM’96-F’04) is Chair Professor and Vice President of Research and Development, National Chiao Tung University.His current research interests include wireless communications and mobile computing Dr. Lin has published over 190 journal articles and more than 200 conference papers. His current research interests include wireless communications and mobile computing Dr. Lin has published over 190 journal articles and more than 200 conference papers. Lin is coauthor of the book Wireless and Mobile Network Architecture (with Imrich Chlamtac; published by John Wiley & Sons). Lin is an IEEE Fellow, an ACM Fellow, an AAAS Fellow, and an IEE Fellow.

A Dual Mode Dielectric Resonator and Its Design to Bandpass Filter

In this paper, the resonant frequency of a dual\|mode dielectric resonator is calculated using a finite difference time\|domain method. A new type of bandpass filter is designed with the calculated coupling coefficient. The filter designed in this paper has reached the design goal, verified by simulation with Ansoft HFSS.

Simulation of Aviation Kerosene Combustion in Dual-mode Scramjet Combustor

Supersonic combustion of aviation kerosene is investigated under the flight conditions of Mach number 5 and fuel-air equivalence ratio 0.551.The trajectories of the fuel droplets and the heat/mass transfer between them are simulated by means of discrete phase model(DPM).The k-ω model is chosen for turbulence closure and the non-premixed probability density function(PDF)approach is used to calculate the turbulence-chemistry interaction.The calculated wall static pressure and the total pressure loss coefficient are very close to the experiment results.The strut and cavity devices significantly increase the combustion efficiency.

适应-系统双模式心理护理在结直肠癌手术病人的应用及对希望水平、生活质量的影响

目的:探讨适应-系统双模式心理护理在结直肠癌手术病人的应用及对希望水平、生存质量的影响。方法:选取78例结直肠癌手术病人为研究对象,按入院顺序将2019年6月至2021年6月入院病人分成对照组(40例),2021年7月至2022年6月入院病人分成观察组(38例)。对照组给予常规心理护理干预,观察组给予适应-系统双模式心理护理干预,比较2组病人的心理状态量表(SCL-90)评分、Herth希望量表(HHI)评分、适应能力量表评分、癌症生命质量量表(FACT-G)评分和治疗依从性的差异。结果:干预后,2组焦虑、抑郁、恐惧、紧张评分均低于同组干预前,且观察组SCL-90各项评分均低于对照组(P<0.05~P<0.01);2组HHI、适应能力量表、FACT-G各项评分均高于同组干预前,且观察组均高于对照组(P<0.05~P<0.01);观察组的治疗依从性高于对照组(P<0.05)。结论:结直肠癌手术病人适应-系统双模式心理护理干预对结肠癌手术病人的护理效果显著,能有效改善病人负面心理状态,提高希望水平、适应能力和治疗依从性,进而提高生活质量。

适应-系统双模式下心理护理对甲状腺全切除手术患者的负性情绪与依从性的影响

目的探讨针对行甲状腺全切除手术的患者,予以常规护理基础上实施适应-系统双模式心理护理措施,观察分析对患者负性情绪以及依从性的影响。方法此次研究时段选取在2020年1月至2023年12月,从本院选取临床需要行甲状腺全切除手术患者80例作为本次研究目标群体,将其依据计算机内随机分组,分为两组即对照组(涵括40例,实施常规护理模式)与观察组(涵括40例,在常规模式上予以实施适应-系统双模式心理护理模式),就两组患者的心理情绪、护理依从性、生活质量、并发症率施以对比。结果观察组的焦虑自评量表(SAS)、抑郁自评量表(SDS)评分以及并发症发生率均低于对照组(均P<0.05);护理后,观察组精神状态、躯体功能、物质生活、周围环境等生活质量各项评分以及患者总依从率均高于对照组(均P<0.05)。结论对行甲状腺全切除手术的患者,予以常规护理基础上实施适应-系统双模式心理护理措施,可有效改善患者的负性情绪,提高其护理依从性,生活质量得到提升,且护理期间的并发症发生更少。

“校企联培制”模式下应用型卓越人才培养路径探究——以湖北大学知行学院为例

近年来地方应用型本科高校以服务地方经济和产业需求为己任,着重培养学生的工程和创新技术应用能力,高校与企业合作,发挥各自优势,实现生产、教学、科研的深度合作,共同完成人才培养。介绍机械类专业在新工科背景下,以培养应用型卓越人才为目标,基于“校企联培制”的总体思路,实施学校专业教学计划与企业工程师培养计划“双计划”,在人才培养体系设计、校企资源整合、就业平台搭建和师资力量提升等方面进行改革,实施产教融合,提升就业能力,最终实现人才的高质量培养和就业。

适应-系统双模式护理干预在肺癌根治术患者中的应用

目的 探究适应-系统双模式护理干预在肺癌根治术患者中的应用效果。方法 选取2021年5月至2022年5月在河南省胸科医院治疗的102例患者为研究对象,以随机数字表法分为两组,给予常规组(51例)常规护理,给予研究组(51例)常规护理联合适应-系统双模式护理。对比两组术后拔管时间、首次下床活动时间、住院时间及干预前后视觉模拟评分法(VAS)、心理弹性量表(CD-RISC)、Kolcaba的舒适状况量表(GCQ)、癌症患者生命质量测定量表(FACT-G)评分。结果 研究组首次下床活动时间、术后拔管时间、住院时间均短于常规组(P<0.05);出院时研究组VAS评分均低于常规组(P<0.05);干预后研究组CD-RISC、GCQ、FACT-G评分均较常规组高(P<0.05);研究组并发症发生率[5.88%(3/51)]低于常规组[21.57%(11/51)](P<0.05)。结论 适应-系统双模式护理干预应用于肺癌根治术中可减轻患者疼痛感,提升住院舒适度,增强心理韧性,还能降低并发症发生风险,有助于提升生活质量,促进预后恢复。

电气化铁路“车-网”系统串/并联双模式宽频谐波扰动产生装置设计与测量方法

精确测量动车组与电力机车(简称机车)四象限变流器(four-quadrant converter,4QC)和牵引网的宽频带阻抗特性是识别电气化铁路“车-网”系统振荡和不稳定问题的重要途径。然而,已有研究采用单一电压/电流扰动注入方式对牵引网或机车4QC阻抗进行测量,可能造成部分谐波扰动流向非目标测量对象,导致被测对象的谐波扰动信噪比低,影响阻抗测量精度。因此,该文提出一种适用于电气化铁路“车-网”联合系统的串/并联双模式宽频谐波扰动产生装置与阻抗测量方法,装置具有电压和电流两种工作模式,可以发出频带为1~3000Hz的宽频谐波扰动。扰动产生装置拓扑主要由多绕组降压变压器、谐波功率放大单元、并联LC谐振电路和反串联绝缘栅双极晶体管(insulated gate bipolar transistor,IGBT)模块等部分构成,结合双闭环dq解耦控制和载波移相开环脉宽调制(pulse-width modulation,PWM)控制策略,实现频带双边可控、幅值可控且分布均匀的大功率谐波扰动输出。最后,利用MATLAB/Simulink仿真和RT-Lab硬件在环实验验证该文串/并联双模式宽频谐波扰动产生装置设计方案及阻抗测量方法的正确性与有效性。

双模功率分流式混合动力汽车传动系统设计

针对双模功率分流式混合动力汽车传动系统的构型,首先,对比分析了单、双模式混合动力系统结构特征及应用范围;然后,结合复合分配式特点,选定3种复合分配式四结点杆模型,通过逆向拆分得到所有可行的复合分配式构型,并根据杆长度和特征参数约束条件,确定构型方案;最后,在此基础上,参考某款车型参数,通过分析输入分配模式、模式切换点和机械点特性确定第3排行星排和离合器位置及结构参数,设计出传动系统构型,为研究双模功率分流式混合动力汽车传动系统提供理论依据。

数字经济专业课程教学评价指标体系研究

当前我国面临严重的数字经济人才短缺约束,迫切需要构建数字经济专业课程双线融合教学质量评价指标体系,以推动数字经济专业师资队伍建设与人才培养。以OBE理念为质量导向、以建构主义理论为新型师生互动理念,构建数字经济专业课程双线融合教学多元评价体系的互动逻辑机制。基于专家打分法构建同行(管理者、督导)评价指标、学生对教师的评价指标、教师自评评价指标、教师对学生的评价指标,从五维视角对数字经济专业课程双线融合教学进行综合评价。

课程思政融入“双元制”教育模式的路径研究

将课程思政有机融入“双元制”教育模式中是保证学生树立正确的价值取向,提升专业课程的教育质量的重要途径。但是融入的过程中出现轻视思政教育、缺乏体系建设、背离思政目标等问题。课程思政融入“双元制”教育,应做好顶层设计,提炼思政目标;深挖思政元素,有机融入课程;创新思政方法,提升育人能力;理论实践结合,强化思政实效;加强教学反思,优化考核评价。

基于用电信息采集系统的双模通信技术研究

本文介绍了目前基于用电信息采集系统的双模通信技术的研究现状及研究内容,梳理了双模通信单元研究的技术路线,解答了何为双模通信和双模通信的技术难点。通过对基于用电信息采集系统的双模通信技术的研究,在传统用电信息采集业务技术上为客户提供多元化的本地通信技术方案,并能快速地掌握高速无线通信技术,巩固和扩大现有的通信模块市场份额。

广播播出系统双核冗余模式传输架构设计

本文提出了广播播出系统中双核冗余模式传输架构,通过常态时单核处理、异态时相互接管的模式,实现了传输系统数据处理核心的实时热备份,有效规避了播出链路中出现故障节点导致后续整条播出链路中断的安全隐患,极大提升了传输系统的安全性与稳定性。

M4224双模数字列尾安全防护系统通信异常原因分析及解决措施

双模数字列尾安全防护系统已在铁路货运列车上普及。针对现场时有发生的列尾风压查询不到的问题,通过在系统上加装空口监测设备,捕捉到发送端和接收端数据的异常记录,找到问题根源在于双模数字列尾机车台和列尾主机扫描制式的时间不匹配。通过多次模拟试验,总结出列尾主机数字模式锁定、改进查询间隔时间、增加列尾机车台查询命令次数、增加备用查询手段等措施,可有效解决该问题,确保列尾机车台各项指标均符合性能要求,为双模数字列尾安全防护系统良好运用提供技术支持。

基于北斗/GPS双模定位的土地面积测绘技术及土地信息系统研究

为提高土地面积测绘的精度、减少测量结果误差,规范土地资源的利用与开发,将北斗/GPS双模定位技术作为核心与支撑,对土地面积测绘技术展开设计与研究,并以此为依据,开展土地信息系统的开发。通过计算卫星信号与接收机距离、土地面积测绘与误差补偿,完成测绘技术的设计。将测绘技术作为基础,进行测量仪选型、土地信息无线通信部署、定位信息获取传输、土地信息系统数据库连接展示,以此实现对系统的开发。通过测试证明了设计的测绘技术测量结果与实际结果的误差较小,可以在实际工作中忽略此误差,将测量结果作为真实结果,同时,综合测试结果可知,本文开发的系统可以达到预期的设计标准与效果。

用电信息采集系统中无线通信技术的应用

无线通信技术是用电信息采集系统的重要组成部分,主要介绍其特点和发展,分析其在用电信息采集系统中的应用场景和需求,比较其在用电信息采集系统中的应用方案和技术特点,评价其在用电信息采集系统中的应用效果和性能指标。此外,提出一种基于高速电力线载波和无线融合的双模通信技术方案,能够有效提高用电信息采集系统的通信效率和质量,为智能电网的建设和运行提供更好的服务。