关系数据库上SDAI实现的研究

ＳＤＡＩ是ＳＴＥＰ的数据接口规范，它为工程应用与ＥＸＰＲＥＳＳ描述的数据模型间定义了一个功能界面。本文讨论了关系数据库上ＳＤＡＩ实现的方法，阐述了ＳＴＥＰ模型与关系模型的一种转换机制，开发了关系数据库上数据交换ＳＤＡＩ接口函数库，为ＳＴＥＰ的工程应用奠定了基础     

SDAI建模研究

ＳＴＥＰ标准数据存取接口ＳＤＡＩ在工程应用模型与ＳＴＥＰ模型间定义了一个功能界面，使数据应用与数据存储分离成为可能。本文阐述了一种ＳＤＡＩ的建模理论和方法，并实现了材料质量信息的ＳＤＡＩ建模。     

Internet服务器应用程序编程接口—动态链接库（ISAPIDLL）

本文介绍了在微软ＷｉｎｄｏｗｓＮＴ４．０服务器和Ｉｎｔｅｒｎｅｔ信息服务器（ＩＳ）支持下的Ｉｎｔｅｒｎｅｔ服务器应用程序编程接口———动态链接库（ＩＳＡＰＩＤＬＬ）的应用,并推荐用Ｄｅｌｐｈｉ３客户机／服务器版本编写ＩＳＡＰＩＤＬＬ程序。     

CIMS系统集成接口的研究

本文讨论了ＣＩＭＳ系统中集成的数据接口和操作接口,并通过对ＣＩＭＳ系统集成接口的分析,提出了一种ＥＲＰ系统和ＰＤＭ系统以及３Ｃ系统（ＣＡＤ／ＣＡＰＰ／ＣＡＭ）集成的体系结构。     

SDAI的C++联编及其基于VERSANT的实现

ＳＤＡＩ是ＳＴＥＰ的标准数据访问接口,Ｃ＋＋作为一种面向对象语言,可以全面包容ＳＴＥＰ信息建模语言ＥＸＰＲＥＳＳ的语义功能,本文论述了ＳＤＡＩ的Ｃ＋＋早,晚联编的有关概念,从ＳＤＡＩ的原始数据类型／实体数据类型／聚集数据类型的Ｃ＋＋联编,父／子类关系等方面对Ｃ＋＋晚联编展开讨论,并介绍基于面向对象数据库ＶＥＲＡＮＴ进行ＳＤＡＩ／Ｃ＋＋联编实现的工作。     

一种外设端SCSI接口的软件设计

在 Ｔ Ｍ Ｓ３２０ Ｃ３１ 与 Ｄ Ｐ５３８０ 建立起来的外设端 Ｓ Ｃ Ｓ Ｉ接口电路的基础上,详细介绍了针对该电路实现 Ｓ Ｃ Ｓ Ｉ通信和 Ｄ Ｍ Ａ 传输的原理、具体方法和程序流程。     

让您的网络更加畅通

看到旁边的这张图片,你会想起什么？是手提式笔记本电脑？错了,这是北京沃泰丰通信公司生产的ＷＩＦ－２０００多链路多时隙多协议规程分析仪。 该仪表可对七号信令（ＳＳ７）、接入网（ＡＮ）、智能网（ＩＮ）．综合业务数字网（ＩＳＤＮ）、数字移动网（ＧＳＭ）等多种网络提供协议监测、解码、分析、一致性测试、模拟仿真等强大的测试功能。 ＷＴＦ－２０００可支持２至３２条双向链路,同时监测大型网络节点上的多个接口的链路协议,每条链路可任意配置多个信令时隙,支持的协议包括ＳＳ７协议：ＭＴＰ、ＴＵＰ、ＳＣＣＰ、ＩＳＵＰ、ＴＣＡＰ; ＡＮ协议：Ｖ５．１、Ｖ５．２;ＩＮ协议：ＩＮＡＰ; ＩＳＤＮ用户协议;ＧＳＭ协议：ＭＡＰ,、Ａ接口、Ａ－ｂｉｓ等,能对多个大话务负荷的链路同时测量并分析复杂信令规程,并通过开放数据库连接（ＯＤＢＣ）长期存放大量数据。支持在线或中断两种方式的线路告警及误码测试和分析统计     

一种支持SDAI的数据库模式定义语言

本文介绍ＯＳＣＡＲ中的数据库模式定义语言（ＤＤＬ），它支持ＳＴＥＰ标准下的标准数据存取接口（ＳＤＡＩ），并详细地描述了ＯＳＣＡＲ对数据字典的信息管理策略，以及这些策略为ＳＤＡＩ提供的底层支持。     

采用标准数据接口SDAI的CAD／CAM系统集成

如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心，实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文讨论通过ＳＴＥＰ的标准数据接口ＳＤＡＩ实现系统集成的集成方法，采用ＳＴＥＰ的数据交换、建模思想，实现了一个产品模型为核心的ＣＡＤ、ＣＡＭ集成系统－ＧＨＣＡＤ（高化ＣＡＤ）。     

GHCAD：一个产品模型为基础的CAD／CAM集成系统

ＳＴＥＰ是关于产品数据表达和交换的国际标准，如何将ＳＴＥＰ的方法和规范应用于系统开发是解决计算机集成制造系统（ＣＩＭＳ）开发的关键问题之一。集成化ＣＡＤ／ＣＡＭ系统是ＣＩＭＳ的核心，实现将ＣＡＤ的工程设计功能和ＣＡＭ的制造功能的结合。本文介绍一个产品模型为基础的ＣＡＤ／ＣＡＭ集成系统－ＧＨＣＡＤ。系统采用ＳＴＥＰ的数据交换、建模思想，以产品模型为核心，通过ＳＴＥＰ的标准数据接口ＳＤＡＩ实现了系统的集成。     

The Death of spam?

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Registration of arbitrary multi-view 3D acquisitions

To register 3D meshes representing smooth surfaces we track the 3D digitization system using photogrammetric techniques and calibrations. We present an example by digitizing a 800 mm × 600 mm portion of a car door. To increase the tracking accuracy the 3D scanner is placed in a cubic frame of side 0.5 m covered with 78 targets. The target frame moves in a volume that is approximately 1100 mm × 850 mm × 900 mm, to digitize the area of interest. Using four cameras this target frame is tracked with of an accuracy of 0.03 mm spatially and 0.180 mrad angularly. A registration accuracy between 0.1 mm and 2 mm is reached. This method can be used for the registration of meshes representing featureless surfaces.     

Web页制作中的动态表现技术

主要动态几种Ｗｅｂ页制作中的动态表现技术,即网页外观表现技术。继内联动画－ＧＩＦ８９ａ动画技术之后,又产生了一系列更高级的动态网页技术,如Ｓｈｏｃｋｗａｖｅ技术、ＤＨＴＭＬ技术与ＶＲＭＬ技术等。     

Impact of spatial variability of tropical forest structure on radar estimation of aboveground biomass

Understanding the spatial variability of tropical forest structure and its impact on the radar estimation of aboveground biomass (AGB) is important to assess the scale and accuracy of mapping AGB with future low frequency radar missions. We used forest inventory plots in old growth, secondary succession, and forest plantations at the La Selva Biological Station in Costa Rica to examine the spatial variability of AGB and its impact on the L-band and P-band polarimetric radar estimation of AGB at multiple spatial scales. Field estimation of AGB was determined from tree size measurements and an allometric equation developed for tropical wet forests. The field data showed very high spatial variability of forest structure with no spatial dependence at a scale above 11 m in old-growth forest. Plot sizes of greater than 0.25 ha reduced the coefficients of variation in AGB to below 20% and yielded a stationary and normal distribution of AGB over the landscape. Radar backscatter measurements at all polarization channels were strongly positively correlated with AGB at three scales of 0.25 ha, 0.5 ha, and 1.0 ha. Among these measurements, PHV and LHV showed strong sensitivity to AGB < 300 Mg ha^− 1 and AGB < 150 Mg ha^− 1 respectively at the 1.0 ha scale. The sensitivity varied across forest types because of differences in the effects of forest canopy and gap structure on radar attenuation and scattering. Spatial variability of structure and speckle noise in radar measurements contributed equally to degrading the sensitivity of the radar measurements to AGB at spatial scales less than 1.0 ha. By using algorithms based on polarized radar backscatter, we estimated AGB with RMSE = 22.6 Mg ha^− 1 for AGB < 300 Mg ha^− 1 at P-band and RMSE = 23.8 Mg ha^− 1 for AGB < 150 Mg ha^− 1 at L-band and with the accuracy optimized at 1-ha scale within 95% confidence interval. By adding the forest height, estimated from the C-band Interferometry data as an independent variable to the algorithm, the AGB estimation improved beyond the backscatter sensitivity by 20% at P-band and 40% at L-band. The results suggested the estimation of AGB can be improved substantially from the fusion of lidar or InSAR derived forest height with the polarimetric backscatter.     

Influence of indoor and outdoor temperatures on the fingertip blood flow rate

A total of 58 healthy subjects participated to elucidate the influence of indoor and outdoor temperatures on blood flow. After walking outdoors for 20 min, the blood flow rate of a subject was measured. The subject then entered a classroom and studied for 120 min, and afterwards, the blood flow rate was measured again. The subjects were exposed to outdoor temperature ranging from −2.5 to 33.7 °C. During the summer, the average blood flow rate after walking outdoors was 45.95 ± 25.790 TPU (tissue perfusion units); after the class, this decreased to 36.14 ± 21.837 TPU (p < 0.05). During the autumn, the blood flow rate decreased from 27.69 ± 12.334 TPU to 12.47 ± 12.255 TPU (p < 0.001). When the outside air temperature was below 3 °C, the blood flow rate indoors increased significantly from 6.74 ± 3.540 TPU to 13.95 ± 11.522 TPU (p < 0.05). In a comfortable and healthy environment, the blood flow rate was not constant but fluctuated between 15 TPU and 40 TPU.     

Motivation of computer based learning across adulthood

This research investigates learning motivation of young and old adults. In detail, we explore motives of young and old adults to participate in two ICT-course settings: e-learning and face-to-face courses. In a first study young (n = 53, M = 26.0 years) and old (n = 55, M = 69.8 years) participants of e-learning courses completed an online questionnaire on learning motivation and personality. In a second study young (n = 46, M = 26.7 years) and old (n = 57, M = 69.5 years) participants of face-to-face ICT courses completed the same learning motivation questionnaire and questions about personality, subjective age and life satisfaction. Exploratory factor analysis revealed four factors of learning motivation: belonging, instrumentality, personal growth, and competition. As expected, older adults expressed stronger motives of belonging and personal growth, and thus expressed a stronger interest in self-determined and intrinsic learning. Young adults, in contrast, strongly endorsed competitive-related motives of learning. Instrumentality was influenced by the interaction of age and subjective age; older participants showed higher instrumentality when the difference between chronological age and subjective age is big. Findings of this study shed new light on assumptions of socioemotional selectivity theory.     

采用遗传算法的简单L系统反演研究

研究如何将任何一个0L符号串经过反向搜索，得出一套能够通过迭代复原的0L基因组。运用遗传算法，针对反演搜索的特性，高定相应的编码、选择、交叉和变异更新等策略，在研究反演的各种基本约束基础上进行反演搜索。实验表明：只要所研究的信息能够通过各种手段得到一串0L符号串描述，那么通过这种反向搜索算法就可以判定该串是否为迭代串，若是迭代串，是可以给出它的最小或较小的基因组结构。为L系统的识别、压缩等提供一种可行的方法。     

Nature of sensitive high-order resonant modes in piezoelectric excited millimeter sized cantilever (PEMC) sensors

High-order resonant modes of piezoelectric-excited cantilever (PEMC) sensors were previously shown to be very highly sensitive at 0.3-2 fg/Hz for in-liquid applications. The purpose of this work is to show experimentally and with finite element model (FEM) simulations that such sensitive modes are strongly influenced by the sensor width, suggesting that the sensitive modes are torsional or buckling modes. From experimental observations the resonant frequency of high-order modes had a strong dependence on width, where a sensor with a smaller width had resonant modes at a higher frequency. Also the FEM simulations indicate that in this frequency range there are resonant modes with a buckling nature that change for a decrease in width, consistent with experimental observations. In order to establish that the width-dependent modes are mass-sensitive in liquids, resonant frequency change to density changes in flow experiments under fully liquid-immersed conditions were determined. Average frequency shifts of 475 ± 49 Hz (n = 5), 533 ± 31 Hz (n = 5), 715 ± 103 Hz (n = 5) and 725 ± 37 Hz (n = 5) were obtained for the four designs investigated in response to a density change of 0.0118 g/cm³. The results show that the resonant frequency response to variations in the geometry provides insightful data on the role of width in PEMC sensor design.     

可达性等价于状态方程可满足性的petri网子类

定义了一个petri网子类:PN=(S,T;F,M0),满足条件s∈S→｜·s｜≤1。证明:当目标标识Md>0时,此petri网子类的可达性等价于状态方程Md=M0+ATX的可满足性。同时,当此petri网子类的可达性等价于状态方程可满足性时,可得出如下两点结论:(1)对于满足M0+ATX>0的每个非平凡的非负整数向量X,都■t∈Tx:M0[t>;(2)对于满足M0+ATX>0的每个非平凡的非负整数向量X,X都是PN的一个可执行向量。     

Evaluation of the HUT modified snow emission model over lake ice using airborne passive microwave measurements

The algorithms designed to estimate snow water equivalent (SWE) using passive microwave measurements falter in lake-rich high-latitude environments due to the emission properties of ice covered lakes on low frequency measurements. Microwave emission models have been used to simulate brightness temperatures (Tbs) for snowpack characteristics in terrestrial environments but cannot be applied to snow on lakes because of the differing subsurface emissivities and scattering matrices present in ice. This paper examines the performance of a modified version of the Helsinki University of Technology (HUT) snow emission model that incorporates microwave emission from lake ice and sub-ice water. Inputs to the HUT model include measurements collected over brackish and freshwater lakes north of Inuvik, Northwest Territories, Canada in April 2008, consisting of snowpack (depth, density, and snow water equivalent) and lake ice (thickness and ice type). Coincident airborne radiometer measurements at a resolution of 80 × 100 m were used as ground-truth to evaluate the simulations.The results indicate that subsurface media are simulated best when utilizing a modeled effective grain size and a 1 mm RMS surface roughness at the ice/water interface compared to using measured grain size and a flat Fresnel reflective surface as input. Simulations at 37 GHz (vertical polarization) produce the best results compared to airborne Tbs, with a Root Mean Square Error (RMSE) of 6.2 K and 7.9 K, as well as Mean Bias Errors (MBEs) of −8.4 K and −8.8 K for brackish and freshwater sites respectively. Freshwater simulations at 6.9 and 19 GHz H exhibited low RMSE (10.53 and 6.15 K respectively) and MBE (−5.37 and 8.36 K respectively) but did not accurately simulate Tb variability (R = −0.15 and 0.01 respectively). Over brackish water, 6.9 GHz simulations had poor agreement with airborne Tbs, while 19 GHz V exhibited a low RMSE (6.15 K), MBE (−4.52 K) and improved relative agreement to airborne measurements (R = 0.47). Salinity considerations reduced 6.9 GHz errors substantially, with a drop in RMSE from 51.48 K and 57.18 K for H and V polarizations respectively, to 26.2 K and 31.6 K, although Tb variability was not well simulated. With best results at 37 GHz, HUT simulations exhibit the potential to track Tb evolution, and therefore SWE through the winter season.