基于感知的多代理的120急救系统

多代理系统以一种分布式的计算模式有助于信息协作分析和决策,而代理的智能感知能力让系统可以根据周围环境而动态调整行为。本文基于多代理技术,介绍了一个普适计算环境下的医疗急救原型系统。通过对Agent技术、感知技术的研究,将其运用到系统的多代理模型的设计中,并介绍了多代理的信息协作算法,感知的多代理系统能够有效提高急救效率和成功率。     

基于RFID识别的校园物联网

为了将各类校园资源通过虚拟网络进行实时有效地即时管理,详细介绍了基于无线射频标签（RFID）及RF读写器的校园物联网的系统构架和软件设计.该系统实现了学生个人信息与校园资源信息的双向沟通,在方便学生校园生活的同时方便了学校相关部门对于校园资源的统筹管理.该系统的最大特色在于通过物联网技术对每一位校园中的学生进行动态定位,并针对校园资源的利用情况即时地与每一位学生进行双向的交流反馈,以此方式实现了资源利用率的最大化.     

ASE噪声偏振化对偏振分光光信噪比监测的影响

偏振相关损耗(PDL)引起的自发辐射(ASE)噪声偏振化是导致偏振分光方法监测光信噪比(OSNR)不准确的重要因素,分别研究了ASE噪声与信号偏振平行和偏振正交2种情况下OSNR监测的误差,推导得出了误差计算公式并通过仿真实验得到验证.理论分析和信真实验结果表明:测量误差随着ASE噪声偏振度(DOP)的增加而变大,且与待测信道本身的OSNR基本无关;比较而言,ASE噪声与信号偏振平行时对监测的影响更严重.当与信号偏振平行的ASE噪声的DOP为0.75时,误差值达6 dB.     

Effect of nitridation on the electrical properties of W:Ti resistors

The electrical properties of tungsten-titanium (W:Ti) thin film resistors sputtered in an argon-nitrogen atmosphere were investigated. The resistivity ρ and the thermal coefficient of resistivity α were calculated as a function of film thickness and nitrogen content. A bulk resistivity of 70±4 μΩ-cm and the mean free path λ_o), of 0.8±0.1 μm were obtained for samples sputtered without nitrogen. The authors believe this to be the first report for the value of the λ_o in sputtered W:Ti. By appropriately controlling the nitrogen content during sputtering, it is possible to vary the value of α from positive to negative. It was found that α decreases with the nitrogen content and is zero at 0.5% N₂. This added degree of freedom in controlling α allows the integrated circuit designer to compensate the thermal effects within a circuit by customizing the resistor parameters without significant layout modifications.     

Effect of relative humidity and temperature on the stability of DNTT transistors: A density of states investigation

Exposure to moisture and elevated temperatures usually results in significant degradation of organic thin film transistor (OTFT) performance. Typical observations include reduced mobility, unstable threshold voltage and the appearance of hysteresis in electrical characteristics. In this contribution we investigate the effects of environmental conditions on OTFTs based on DNTT, a high-mobility, small-molecule, organic semiconductor, with polystyrene (PS) as the gate insulator. Device characteristics were measured after consecutive 30-min exposures to a relative humidity (RH) that was gradually increased from 20% to 80% with temperature fixed at 20 °C and for temperatures increasing from 20 °C to 90 °C with RH held at 10%. Despite significant negative shifts in turn-on and threshold voltages, only slight changes in the hole mobility were observed at the highest RH and temperature. The DNTT density of states (DoS) extracted from transfer characteristics in the linear regime using the Grünewald approach showed little change with environmental conditions. In all cases, the DoS decreased from ∼1 × 10²⁰ down to ∼1 × 10¹⁷ cm⁻³ eV⁻¹ in the 0.45 eV energy range above the hole mobility edge. Some evidence was obtained for a weak trap feature between ∼0.25 and 0.35 eV above the mobility edge. These results confirm the high stability of DNTT as a semiconducting material and that OTFT instability observed here is associated almost entirely with a flatband voltage shift caused by hole trapping in the polystyrene gate dielectric or at the polystyrene/DNTT interface.     

Effect of packing on the cluster nature of C nanotubes: An information entropy analysis

The possibility of the existence of single−wall carbon nanotubes (SWNTs) in organic solvents in the form of clusters is discussed. A theory is developed based on a bundlet model for clusters, which enables describing the distribution function of clusters by size. Comparison of the calculated values of solubility with experiments would permit obtaining energetic parameters characterizing the interaction of an SWNT with its surrounding, in a solid or solution. Fullerenes and SWNTs are unique objects, whose behaviour in many physical situations is characterized by remarkable peculiarities. Peculiarities in solutions show up first in that fullerenes and SWNTs represent the only soluble forms of carbon, what is related to the originality in the molecular structure of fullerenes and SWNTs. The fullerene molecule is a virtually uniform closed spherical or spheroidal surface, and an SWNT is a smooth cylindrical unit. Both structures give rise to the relatively weak interaction between the neighbouring molecules in a crystal and promote interaction of the molecules with those of a solvent. Another peculiarity in solutions is related to their trend to form clusters, consisting of a number of fullerene molecules or SWNTs. The energy of interaction of a fullerene molecule or SWNT with solvent molecules is proportional to the surface of the former molecule and roughly independent of the orientation of solvent molecules. All these phenomena have a unified explanation in the framework of the bundlet model of a cluster, in accordance with which the free energy of an SWNT involved in a cluster is combined from two components, viz. a volume one proportional to the number of molecules n in a cluster, and a surface one proportional to n^1/2. Algorithms for classification are proposed based on the criteria information entropy and its production. Many classification algorithms are based on information entropy. When applying these procedures to sets of moderate size, an excessive number of results appear compatible with data, and this number suffers a combinatorial explosion. However, after the equipartition conjecture, one has a selection criterion between different variants resulting from classification between hierarchical trees. According to this conjecture, for a given charge or duty, the best configuration of a flowsheet is the one in which the entropy production is most uniformly distributed. Information entropy, cluster and principal component analyses agree.