A Dual-Channel Secure Transmission Scheme for Internet-Based Networked Control Systems

Two significant issues in Internet-based networked control systems （ INCSs）, transport performance of different protocols and security breach from Internet side, are investigated. First, for improving the performance of data transmission, user datagram protocol （UDP） is adopted as the main stand for controllers and plants using INCSs. Second, a dual-channel secure transmission scheme （DCSTS）based on data transmission characteristics of INCSs is proposed, in which a raw UDP channel and a secure TCP （transmission control protocol） connection making use of SSL/TLS （secure sockets layer/transport layer security） are included. Further, a networked control protocol （NCP） at application layer for supporting DCSTS between the controllers and plants in INCSs is designed, and it also aims at providing a universal communication mechanism for interoperability of devices among the networked control laboratories in Beijing Institute of Technology of China, Central South University of China and Tokyo University of Technology of Japan. By means of a networked single-degree-of-free- dom robot arm, an INCS under the new protocol and security environment is created. Compared with systems such as IPSec or SSL/TLS, which may cause more than 91% network throughput deduction, the new DCSTS protocol may yield results ten times better, being just 5.67%.

Cascaded dual-channel fiber SPR temperature sensor based on liquid and solid encapsulations

In order to control the working wavelength range of the fiber surface plasmon resonance(SPR)temperature sensor and realize the wavelength division multiplexing type multi-channel fiber SPR temperature sensor,by comprehensively investigating the influence of liquids with different thermal-optical coefficients and solid packaging materials on the performance of fiber SPR temperature sensor,a dual-channel fiber SPR temperature sensor based on liquid-solid cascade encapsulation was designed and fabricated.The liquid temperature sensing stage encapsulated in capillary worked in 616.03 nm-639.05 nm band,the solid sensing stage coated with pouring sealant worked in 719.37 nm-825.27 nm band,and the two stages were cascaded to form a fiber dual-channel temperature sensor.The testing results indicated that when the temperature range was 35℃-95℃,the sensitivity of two-stage temperature detection was−0.384 nm/℃and−1.765 nm/℃respectively.The proposed fiber sensor has simple fabrication and excellent performance which can be widely used in various fields of dual-channel temperature measurement and temperature compensation.

Significant improvements in mechanical properties of AA5083 aluminum alloy using dual equal channel lateral extrusion

Dual equal channel lateral extrusion (DECLE), as a severe plastic deformation (SPD) process, was employed forimproving the mechanical properties of AA5083 aluminum alloy. Several experiments were conducted to study the influences of theroute type, namely A and B, and pass number on mechanical properties of the material. The process was conducted up to 6 passeswith decreasing process temperature, specifically from 573 to 473 K. Supplementary experiments involving metallography, hardnessand tensile tests were carried out in order to evaluate the effects of the process variables. The hardness measurements exhibitedreasonably uniform distributions within the product with a maximum increase of 64% via a 6-pass operation. The yield and ultimatestrengths also amended 107% and 46%, respectively. These significant improvements were attributed to the severe shear deformationof grains and decreasing pass temperature, which intensified the grain refinement. TEM images showed an average grain sizereduction from 100 μm for the annealed billet to 200 nm after 6 passes of DECLE. Finally, the experimental findings for routes A andB were compared and discussed and some important conclusions were drawn.

Fiber cladding dual channel surface plasmon resonance sensor based on S-type fiber

Fiber cladding surface plasmon resonance(SPR)sensors have few structures,and a clad SPR sensor based on S-type fiber is proposed in this paper.This new type of fiber cladding SPR sensor was formed by electrofusing an S-shaped structure on the fiber to couple the light in the fiber core to the cladding.In this paper,the effects of fiber parameters on the performance of the sensor were studied by simulation and experiment.Based on the conclusion that the smaller the core diameter is,the closer the working band of the SPR resonance is to long wavelengths,and that the geometric characteristics mean that a multimode fiber can receive the fiber cladding light from a small core diameter few-mode fiber,a dual channel SPR sensor with a double S-type fiber cascade was proposed.In the refractive index detection range of 1.333–1.385refractive index units(RIU),the resonant working band of channel I is 627.66 nm–759.78 nm,with an average sensitivity of 2540.77 nm/RIU,and the resonant working band of channel II is 518.24 nm–658.2 nm,with an average sensitivity of2691.54 nm/RIU.The processing method for the S-type fiber cladding SPR sensor is simple,effectively solving the problem of this type of SPR sensor structure and the difficult realization of a dual channel.The sensor is expected to be used in the fields of medical treatment and biological analysis.

A dual channel perturbation particle filter algorithm based on GPU acceleration

The particle filter（PF） algorithm is one of the most commonly used algorithms for maneuvering target tracking. The traditional PF maps from multi-dimensional information to onedimensional information during particle weight calculation, and the incorrect transmission of information leads to the fact that the particle prediction information does not match the weight information, and its essence is the reduction of the information entropy of the useful information. To solve this problem, a dual channel independent filtering method is proposed based on the idea of equalization mapping. Firstly, the particle prediction performance is described by particle manipulations of different dimensions, and the accuracy of particle prediction is improved. The improvement of particle degradation of this algorithm is analyzed in the aspects of particle weight and effective particle number. Secondly, according to the problem of lack of particle samples, the new particles are generated based on the filtering results, and the particle diversity is increased. Finally, the introduction of the graphics processing unit（GPU） parallel computing the platform, the “channel-level” and “particlelevel” parallel computing the program are designed to accelerate the algorithm. The simulation results show that the algorithm has the advantages of better filtering precision, higher particle efficiency and faster calculation speed compared with the traditional algorithm of the CPU platform.

Dual transfer channels of photo-carriers in 2D/2D/2D sandwich-like ZnIn2S4/g-C_(3)N_(4)/Ti_(3)C_(2) MXene S-scheme/Schottky heterojunction for boosting photocatalytic H2 evolution

Construction of multi-channels of photo-carrier migration in photocatalysts is favor to boost conversion efficiency of solar energy by promoting the charge separation and transfer.Herein,a ternary ZnIn_(2)S_(4)/g-C_(3)N_(4)/Ti_(3)C_(2) MXene hybrid composed of S-scheme junction integrated Schottky-junction was fabricated using a simple hydrothermal approach.All the components(g-C_(3)N_(4),ZnIn_(2)S_(4) and Ti_(3)C_(2) MXene)demonstrated two-dimensional(2D)nanosheets structure,leading to the formation of a 2D/2D/2D sandwich-like structure with intimate large interface for carrier migration.Furthermore,the photogenerated carriers on the g-C_(3)N_(4) possessed dual transfer channels,including one route in S-scheme transfer mode between the g-C_(3)N_(4) and ZnIn_(2)S_(4) and the other route in Schottky-junction between g-C_(3)N_(4) and Ti_(3)C_(2) MXene.Consequently,a highly efficient carrier separation and transport was realized in the ZnIn_(2)S_(4)/g-C_(3)N_(4)/Ti_(3)C_(2) MXene heterojunction.This ternary sample exhibited wide light response from 200 to 1400 nm and excellent photocatalytic H_(2) evolution of 2452.1μmol∙g^(–1)∙h^(–1),which was 200,3,1.5 and 1.6 times of g-C_(3)N_(4),ZnIn_(2)S_(4),ZnIn_(2)S_(4)/Ti_(3)C_(2) MXene and g-C_(3)N_(4)/ZnIn_(2)S_(4) binary composites.This work offers a paradigm for the rational construction of multi-electron pathways to regulate the charge separation and migration via the introduction of dual-junctions in catalytic system.

Mode Selection Strategy of Dual Distribution Channel Based on Revenue Analysis

Within the scope of dual distribution channel(DDC)modes—ME&T-C and M-T&E-C,a game model designed for channel members was proposed.Based on this game model,the game equilibrium under both centralized and decentralized decisionmaking situations was analyzed,the channel members' and overall revenues of two modes under the same decision-making situation are compared,and the influence of demand shift coefficient to the overall and members' revenue was also studied through example analysis.Based on the comparison and analysis of the revenue yielded from the two DDC modes,it's discovered that within a certain hypothetical range,the M-T&E-C mode seems to be a better option for the manufacturer than the ME&T-C mode.Therefore,this discovery can be served as a theoretical reference for manufacturers when choosing the optimal DDC mode in real life.

Dual Channel SIS Receiver of Trao Telescope

We have developed the dual channel receiver with 100GHz and 150GHz band, which is used to make the simultaneous observation with two bands. The SIS mixers are used in both bands. The constructed dewar for receiver has the performance with the vacuum of 10 -8 Torr and the temperature of 4 2K. The receiver noise temperature is 50K (DSB) for 100GHz band and 80K (DSB) for 150GHz band ,respectively. In order to achieve the simultaneous observations, the quasioptical system is precisely designed, and also evaluated by the measurement in the laboratory. We have observed the various sources using this receiver since October 1998. The relative pointing offset between two bands is 3″.

Research on the Mediating Effect of Market Benefit Between Dual Distribution Channel Conflicts and Financial Performance of Garment Enterprises

The paper discussed the impact of dual distribution channel conflicts on financial performance of garment enterprises by multiple regression and mediation effect has been analyzed with market benefit as the mediated variable based on the survey data of Shanghai region. The results show that： first, channel contention, channel areal differences and channel perception differences have a negative effect on financial performance and channel communication has a positive effect on financial performance significantly; second, market benefit has a positive effect on financial performance significantly; third, channel contention, channel areal differences and channel perception differences have a negative effect on market benefit and channel communication has a positive effect on market benefit significantly; forth, market benefit has a partial mediation effect on the influence of channel areal differences and channel communication on financial performance. Therefore, channel areal differences and channel communication are two major aspects among the dual distribution channel conflicts which may have influences on financial benefit of garment enterprises, and clothing company should lay emphasis on the settling of these two matters.

Clinical efficacy and safety of double-channel anastomosis and tubular gastroesophageal anastomosis in gastrectomy

BACKGROUND With the continuous progress of surgical technology and improvements in medical standards,the treatment of gastric cancer surgery is also evolving.Proximal gastrectomy is a common treatment,but double-channel anastomosis and tubular gastroesophageal anastomosis have attracted much attention in terms of surgical options.Each of these two surgical methods has advantages and disadvantages,so it is particularly important to compare and analyze their clinical efficacy and safety.AIM To compare the surgical safety,clinical efficacy,and safety of double-channel anastomosis and tubular gastroesophageal anastomosis in proximal gastrectomy.METHODS The clinical and follow-up data of 99 patients with proximal gastric cancer who underwent proximal gastrectomy and were admitted to our hospital between January 2018 and September 2023 were included in this retrospective cohort study.According to the different anastomosis methods used,the patients were divided into a double-channel anastomosis group(50 patients)and a tubular gastroesophageal anastomosis group(49 patients).In the double-channel anastomosis,Roux-en-Y anastomosis of the esophagus and jejunum was performed after proximal gastric dissection,and then side-to-side anastomosis was performed between the residual stomach and jejunum to establish an antireflux barrier and reduce postoperative gastroesophageal reflux.In the tubular gastroesophageal anastomosis group,after the proximal end of the stomach was cut,tubular gastroplasty was performed on the distal stump of the stomach and a linear stapler was used to anastomose the posterior wall of the esophagus and the anterior wall of the stomach tube.The main outcome measure was quality of life 1 year after surgery in both groups,and the evaluation criteria were based on the postgastrectomy syndrome assessment scale.The greater the changes in body mass,food intake per meal,meal quality subscale score,and total measures of physical and mental health score,the better the condition;the greater the other indicators,the worse the condition.The secondary outcome measures were intraoperative and postoperative conditions,the incidence of postoperative long-term complications,and changes in nutritional status at 1,3,6,and 12 months after surgery.RESULTS In the double-channel anastomosis cohort,there were 35 males(70%)and 15 females(30%),33(66.0%)were under 65 years of age,and 37(74.0%)had a body mass index ranging from 18 to 25 kg/m2.In the group undergoing tubular gastroesophageal anastomosis,there were eight females(16.3%),21(42.9%)individuals were under the age of 65 years,and 34(69.4%)had a body mass index ranging from 18 to 25 kg/m2.The baseline data did not significantly differ between the two groups(P>0.05 for all),with the exception of age(P=0.021).The duration of hospitalization,number of lymph nodes dissected,intraoperative blood loss,and perioperative complication rate did not differ significantly between the two groups(P>0.05 for all).Patients in the dual-channel anastomosis group scored better on quality of life measures than did those in the tubular gastroesophageal anastomosis group.Specifically,they had lower scores for esophageal reflux[2.8(2.3,4.0)vs 4.8(3.8,5.0),Z=3.489,P<0.001],eating discomfort[2.7(1.7,3.0)vs 3.3(2.7,4.0),Z=3.393,P=0.001],total symptoms[2.3(1.7,2.7)vs 2.5(2.2,2.9),Z=2.243,P=0.025],and other aspects of quality of life.The postoperative symptoms[2.0(1.0,3.0)vs 2.0(2.0,3.0),Z=2.127,P=0.033],meals[2.0(1.0,2.0)vs 2.0(2.0,3.0),Z=3.976,P<0.001],work[1.0(1.0,2.0)vs 2.0(1.0,2.0),Z=2.279,P=0.023],and daily life[1.7(1.3,2.0)vs 2.0(2.0,2.3),Z=3.950,P<0.001]were all better than those of the tubular gastroesophageal anastomosis group.The group that underwent tubular gastroesophageal anastomosis had a superior anal exhaust score[3.0(2.0,4.0)vs 3.5(2.0,5.0),Z=2.345,P=0.019]compared to the dual-channel anastomosis group.Hemoglobin,serum albumin,total serum protein,and the rate at which body mass decreased one year following surgery did not differ significantly between the two groups(P>0.05 for all).CONCLUSION The safety of double-channel anastomosis in proximal gastric cancer surgery is equivalent to that of tubular gastric surgery.Compared with tubular gastric surgery,double-channel anastomosis is a preferred surgical technique for proximal gastric cancer.It offers advantages such as less esophageal reflux and improved quality of life.

Designing cost-effective network-on-chip by dual-channel access mechanism

A dual-channel access mechanism to overcome the drawback of traditional single-channel access mechanism for network-on-chip （NoC） is proposed. In traditional single-channel access mechanism, every Internet protocol （IP） has only one chan- nel to access the on-chip network. When the network is relatively idle, the injection rate is too small to make good use of the network resource. When the network is relatively busy, the ejection rate is so small that the packets in the network cannot leave immediately, and thus the probability of congestion is increased. In the dual-channel access mechanism, the injection rate of IP and the ejection rate of the network are increased by using two optional channels in network interface （NI） and local port of routers. Therefore, the communication performance is improved. Experimental results show that compared with traditional single-channel access mechanism, the proposed scheme greatly increases the throughput and cuts down the average latency with reasonable area increase.

Rapid Framing Mass Storage System on the Internet

Mass storage system is now very important for storing huge volume of data in many application system such as VOD systems, electronic library, scientific computation and so on. Besides the storage device and network devices, the real performance of mass storage system is greatly influenced by the connection way between the host and storage system. Here we propose a new design of mass storage system by promoting the storage devices' functions and involving, them directly into data delivering. It can easily meet the demands both for capacity and I/O bandwidth in those applications, and has better service quality and performance compared with the traditional system in delivering mass data over network.

Dual-channel quantum meta-hologram for display

Quantum technologies rely on creating and manipulating entangled sources,which are essential for quantum information,communication,and imaging.By integrating quantum technologies and all-dielectric metasurfaces,the performance of miniature display devices can be enhanced to a higher level.Miniature display technology,such as virtual reality display,has achieved original commercial success,and was initially applied to immersive games and interactive scenes.While the consumer market has quickly adopted this technology,several areas remain for improvement,including concerns around bulkiness,dual-channel display,and noise reduction.Here,we experimentally realize a quantum meta-hologram concept demonstration of a miniature display.We fabricate an ultracompact meta-hologram based on 1μm thick titanium dioxide(TiO_(2)).The meta-hologram can be remotely switched with heralding technique and is robust against noise with the quantum entangled source.The platform can alter the miniature display channel by manipulating heralding photons’polarization,removing speckles and multiple reflective light noise,improving imaging contrast,and potentially decreasing device weight.Imaging contrast increases from 0.36 dB under speckle noise influences to 6.8 dB in quantum correlation imaging.This approach has the potential to miniaturize quantum displays and quantum communication devices.

差异定价和跨渠道退货的双渠道供应链复杂特性研究

考虑决策主体的有限理性行为,构建零售商双渠道差异定价的跨渠道退货价格博弈模型,从系统复杂特性的角度分析供应链系统的局部渐近稳定性和演化行为。根据朱利判据给出系统的稳定域,借助数值仿真刻画系统的动力学行为特征,探究系统状态对价格决策和企业利润的影响,并对失稳系统进行有效控制。研究结果表明,价格调整速度过快容易导致供应链系统经倍周期分岔而陷入混沌状态,存在价格调整的稳定域以确保系统稳定;作为博弈主导者的制造商调整批发价格会影响整个系统的稳定性,而零售商的价格调整仅影响自身稳定;混沌的系统对制造商和零售商都不利,倍周期分岔的系统对制造商有利而对零售商有害,稳定的系统对两者都有利;延迟反馈控制法能有效控制混沌系统;消费者满意度对价格的影响受制于供应链系统状态的制约。

双通道GC-SCD系统测定乙烯和丙烯气体中痕量硫化物

建立了一种采用双通道气相色谱-硫化学发光检测器(GC-SCD)系统分析乙烯、丙烯中痕量硫化物的方法。考察了硫化物在双通道系统的分离效果以及方法的重复性、准确性,并比较了色谱柱的惰性。实验结果表明,该方法可实现硫化氢、羰基硫、甲硫醇、乙硫醇、甲硫醚和乙硫醚6种硫化物的分离和定量,避免了单根色谱柱的烃类干扰问题。该方法的重复性好,含量在0.1~1μmol/mol以下硫化物组分的相对标准偏差在10%以内,回收率在80%~120%之间,灵敏度高,检测限可达30 nmol/mol。

特高压真型塔操作冲击放电电场测量

鉴于研究长空气间隙放电特性对于发展特高压输电技术具有重要意义,开发了光电集成电场传感器,并建立了双通道的电场测量系统。利用球板间隙冲击电场对测量系统进行了校验,并且用冲击信号均匀电场考察了测量系统的时域波形性能,证明了测量系统对电力系统的冲击信号具有较小的误差和良好的时域特性。利用该系统在特高压真型酒杯塔中相塔窗内开展了操作波放电电场测量实验,得到了电场峰值和波形,并与计算值进行了对比,分析了电晕、流注和先导等因素的影响。实验结果表明,光电集成电场测量系统可以用于特高压长空气间隙放电的研究工作。

视觉预期的类型及神经机制

视觉预期是一种运用视觉信息的部分资源和先行资源对即将发生的事件进行预测的能力。为了人们更加清楚地认识视觉预期的内在加工过程,同时也有助于国内外研究者更为科学深入地探讨这种自上而下的加工。本文首先论述了视觉预期的两种研究技术:眼动追踪技术和运动轨迹技术。然后介绍了婴幼儿和成人两个发展阶段的研究发现。最后指出今后研究应加强视觉预期相关技术在临床诊断中的应用,注重环境在视觉预期中的作用,从神经网络角度研究视觉预期的神经基础。

一种基于误差电压比例记忆的无塔校相方法

针对大部分航天测控站下行链路校相功能还依赖标校塔的现状,分析了偏馈模式和有线模式下方位、俯仰误差电压比例值保持稳定的原理,提出了利用该稳定性实现测控站无塔校相的方法。实验证明,利用该方法得到的校相结果交叉耦合小于七分之一,定向灵敏度满足要求。该方法解决了设备组合变更或设备检修后需要重新标定的问题,可应用于双通道跟踪体制的统一测控系统,具有很强的实用性。

双通道开关磁阻起动/发电机系统建模与仿真

针对双通道开关磁阻电机运行时两个通道存在强烈电磁耦合的特点,提出一种双通道开关磁阻电机的建模方法。基于有限元模型,对双通道开关磁阻电机的磁场进行有限元分析,建立考虑互感耦合影响的双通道开关磁阻电机的非线性数学模型,对电机在不同工作模式下的稳态和动态特性进行对比仿真分析。搭建以功率变换器和DSP为核心的控制系统实验平台,分别在单通道和双通道工作模式下进行电动和发电运行实验以及闭环建压实验,实现双通道开关磁阻电机系统的两个通道的同步稳定运行和控制,实验结果验证了建模方法和理论分析的正确性。

双通道视觉质量系统评估不同方位白内障透明角膜切口手术疗效

目的探讨不同方位白内障透明角膜切口手术疗效以及双通道视觉质量分析系统在白内障手术前后视觉质量评估中的应用。方法收集白内障超声乳化联合囊内人工晶状体植入术患者共64例64眼,根据术中透明角膜切口的位置分为A组(透明角膜切口位于双眼颞侧)和B组(采用正上方透明角膜切口)。所有入选病例均行标准对数视力评估,双通道视觉质量分析系统检测。比较两组视力、MTF截止空间频率(MTF cut-off)、斯特列尔比值(strehl ratio,SR)、客观散射指数(objective scattering index,OSI)值及对比度为100%、20%、9%时的OQAS值(OQAS value,OV100%、OV20%和OV9%)。结果所有患者术后1d、1周裸眼视力及最佳矫正视力均逐渐上升,较术前差异均有统计学意义(P<0.05),1周后视力逐渐趋于稳定;其中A组术后1d、1周裸眼视力及最佳矫正视力均高于同时间点B组患者,差异均有统计学意义(均为P<0.05)。术后1个月及3个月两组间裸眼视力及最佳矫正视力无明显差异(P>0.05)。术后1d及1周两组患者OSI值均较术前逐渐下降,各时间点比较差异均有统计学意义(均为P<0.05),其中A组术后1d(2.81±0.89)及1周(1.98±0.73)OSI值明显低于B组术后1d(3.46±1.17)及1周(2.61±1.20)(均为P<0.05)。两组患者术后1个月及3个月与术后1周比较OSI值均无明显差异(均为P>0.05)。术后1d、1周、1个月及3个月两组患者OV9%值均较术前逐渐上升,各时间点比较差异均有统计学意义(均为P<0.05),其中A组术后1d(0.29±0.09)、1周(0.33±0.12)、1个月(0.37±0.14)及3个月(0.42±0.17)均明显高于B组术后1d(0.24±0.10)、1周(0.27±0.09)、1个月(0.31±0.09)及3个月(0.34±0.14)(均为P<0.05);所有患者术后各时间点MTF值、SR值、OV100%值、OV20%值与术前比较差异均无统计学意义(均为P>0.05)。结论白内障术中采用颞侧角膜切口,术后眼内散射小,视力恢复快,视觉质量高,远期效果有待进一步研究。双通道视觉质量分析系统能进一步量化视觉质量参数,在视觉质量评估方面具有一定优势。