U SB( U niversal Serial Bus)经过了 9年发展 ,已经得到了市场的认可 ,其传输速度达到了最大 480 Mb/s的惊人地步 ,而 USB OTG ( On The Go)的推出更是鼓舞人心 ,其双重角色的强大功能可以使 U SB设备摆脱对 PC的完全依赖。 USB OTG是 ...U SB( U niversal Serial Bus)经过了 9年发展 ,已经得到了市场的认可 ,其传输速度达到了最大 480 Mb/s的惊人地步 ,而 USB OTG ( On The Go)的推出更是鼓舞人心 ,其双重角色的强大功能可以使 U SB设备摆脱对 PC的完全依赖。 USB OTG是 U SB 2 .0规范的补充 ,他使外设可以在无主机参与的情况下直接互连进行通信工程。本文简单介绍了 U SB OTG的工作原理 ,并分析了现在 U SB OTG的应用情况 ,重点针对数码相机伴侣存在的问题 。展开更多
USB OTG(On-The-Go)是USB2.0规范的补充,它使外设可以在无主机参与的情况下直接互连进行通信。本文讨论了USBOTG补充规范的新增特性,包括OTG事务请求协议SRP和主机流通协议HNP、连接器和电缆、两用OTG设备和外设式OTG设备、驱动程序以...USB OTG(On-The-Go)是USB2.0规范的补充,它使外设可以在无主机参与的情况下直接互连进行通信。本文讨论了USBOTG补充规范的新增特性,包括OTG事务请求协议SRP和主机流通协议HNP、连接器和电缆、两用OTG设备和外设式OTG设备、驱动程序以及数据流模型。展开更多
RIA Connect公司推出USB mini B连接器。这一USB产品可为便携装置在不与PC连接的情况下完成通信和数据共享。MiniB具有高速、超微型化的特点，针对USB2．0市场上的USB On-the-Go设备而推出。该连接器的应用对象是消费类、便携式与无线...RIA Connect公司推出USB mini B连接器。这一USB产品可为便携装置在不与PC连接的情况下完成通信和数据共享。MiniB具有高速、超微型化的特点，针对USB2．0市场上的USB On-the-Go设备而推出。该连接器的应用对象是消费类、便携式与无线电子产品市场，采用表面贴装式触点，全屏蔽，带有拱形导入部分。展开更多
Characterizing spatial variability of soil attributes, using traditional soil sampling and laboratory analysis, is cost prohibitive. The potential benefit of managing soils on a site-specific basis is well established...Characterizing spatial variability of soil attributes, using traditional soil sampling and laboratory analysis, is cost prohibitive. The potential benefit of managing soils on a site-specific basis is well established. High variations in glacial till soil render detailed soil mapping difficult with limited number of soil samples. To overcome this problem, this paper demonstrates the feasibility of soil carbon and clay mapping using the newly developed on-the-go near-infrared reflectance spectroscopy (NIRS). Compared with the geostatistics method, the partial least squares regression (PLSR), with NIRS measurements, could yield a more detailed map for both soil carbon and clay. Further, by using independent validation dataset, the accuracy of predicting could be improved significantly for soil clay content and only slightly for soil carbon content. Owing to the complexity of field conditions, more work on data processing and calibration modeling might be necessary for using on-the-go NIRS measurements.展开更多
USB-OTG(USB-On The Go)技术是USB2.0规范的重要补充,它实现了在无PC机参与的情况下,两个便携式设备直接互连通信,使USB设备摆脱了对PC的依赖。文中主要介绍了USB-OTG技术的工作原理、芯片类型及CSC3800型USB-OTG功能的应用。为了提高...USB-OTG(USB-On The Go)技术是USB2.0规范的重要补充,它实现了在无PC机参与的情况下,两个便携式设备直接互连通信,使USB设备摆脱了对PC的依赖。文中主要介绍了USB-OTG技术的工作原理、芯片类型及CSC3800型USB-OTG功能的应用。为了提高便携设备之间的互联性,研究这样一种新技术是十分必要的,同时也具有较高的市场价值。展开更多
In an agricultural field, monitoring the temporal changes in soil conditions can be as important as understanding spatial heterogeneity when it comes to determining the locally-optimized application rates of key agric...In an agricultural field, monitoring the temporal changes in soil conditions can be as important as understanding spatial heterogeneity when it comes to determining the locally-optimized application rates of key agricultural inputs. For example, the monitoring of soil water content is needed to decide on the amount and timing of irrigation. On-the-go soil sensing technology provides a way to rapidly obtain high-resolution, multiple data layers to reveal soil spatial variability, at a relatively low cost. To take advantage of this information, it is important to define the locations, which represent diversified field conditions, in terms of their potential to store and release soil water. Choosing the proper locations and the number of soil monitoring sites is not straightforward. In this project, sensor-based maps of soil apparent electrical conductivity and field elevation were produced for seven agricultural fields in Nebraska, USA. In one of these fields, an eight-node wireless sensor network was used to establish real-time relationships between these maps and the Water Stress Potential (WSP) estimated using soil matric potential measurements. The results were used to model hypothetical WSP maps in the remaining fields. Different placement schemes for temporal soil monitoring sites were evaluated in terms of their ability to predict the hypothetical WSP maps with a different range and magnitude of spatial variability. When a large number of monitoring sites were used, it was shown that the probability for uncertain model predictions was relatively low regardless of the site selection strategy. However, a small number of monitoring sites may be used to reveal the underlying relationship only if these locations are chosen carefully.展开更多
This paper describes the specification and implement of a Universal Serial Bus （USB） dual-mode function IP core used for embedded system. Controlled by micro controller/CPU, the novel IP core can function as a USB h...This paper describes the specification and implement of a Universal Serial Bus （USB） dual-mode function IP core used for embedded system. Controlled by micro controller/CPU, the novel IP core can function as a USB host controller or USB peripheral controller. When configured as a USB host controller, it supports all USB 1.1 transaction types; supports automatic preamble insertion, and automatic SOF generation and transmission. Otherwise, when it is configured as a USB device by a microprocessor, it operates as a USB peripheral controller comvliant with USB2.0 svecification.展开更多
文摘U SB( U niversal Serial Bus)经过了 9年发展 ,已经得到了市场的认可 ,其传输速度达到了最大 480 Mb/s的惊人地步 ,而 USB OTG ( On The Go)的推出更是鼓舞人心 ,其双重角色的强大功能可以使 U SB设备摆脱对 PC的完全依赖。 USB OTG是 U SB 2 .0规范的补充 ,他使外设可以在无主机参与的情况下直接互连进行通信工程。本文简单介绍了 U SB OTG的工作原理 ,并分析了现在 U SB OTG的应用情况 ,重点针对数码相机伴侣存在的问题 。
文摘RIA Connect公司推出USB mini B连接器。这一USB产品可为便携装置在不与PC连接的情况下完成通信和数据共享。MiniB具有高速、超微型化的特点，针对USB2．0市场上的USB On-the-Go设备而推出。该连接器的应用对象是消费类、便携式与无线电子产品市场，采用表面贴装式触点，全屏蔽，带有拱形导入部分。
基金Supported by the Agricultural S&T Cooperation Program of Zhejiang Province, China (No. N20100015)
文摘Characterizing spatial variability of soil attributes, using traditional soil sampling and laboratory analysis, is cost prohibitive. The potential benefit of managing soils on a site-specific basis is well established. High variations in glacial till soil render detailed soil mapping difficult with limited number of soil samples. To overcome this problem, this paper demonstrates the feasibility of soil carbon and clay mapping using the newly developed on-the-go near-infrared reflectance spectroscopy (NIRS). Compared with the geostatistics method, the partial least squares regression (PLSR), with NIRS measurements, could yield a more detailed map for both soil carbon and clay. Further, by using independent validation dataset, the accuracy of predicting could be improved significantly for soil clay content and only slightly for soil carbon content. Owing to the complexity of field conditions, more work on data processing and calibration modeling might be necessary for using on-the-go NIRS measurements.
文摘USB-OTG(USB-On The Go)技术是USB2.0规范的重要补充,它实现了在无PC机参与的情况下,两个便携式设备直接互连通信,使USB设备摆脱了对PC的依赖。文中主要介绍了USB-OTG技术的工作原理、芯片类型及CSC3800型USB-OTG功能的应用。为了提高便携设备之间的互联性,研究这样一种新技术是十分必要的,同时也具有较高的市场价值。
文摘In an agricultural field, monitoring the temporal changes in soil conditions can be as important as understanding spatial heterogeneity when it comes to determining the locally-optimized application rates of key agricultural inputs. For example, the monitoring of soil water content is needed to decide on the amount and timing of irrigation. On-the-go soil sensing technology provides a way to rapidly obtain high-resolution, multiple data layers to reveal soil spatial variability, at a relatively low cost. To take advantage of this information, it is important to define the locations, which represent diversified field conditions, in terms of their potential to store and release soil water. Choosing the proper locations and the number of soil monitoring sites is not straightforward. In this project, sensor-based maps of soil apparent electrical conductivity and field elevation were produced for seven agricultural fields in Nebraska, USA. In one of these fields, an eight-node wireless sensor network was used to establish real-time relationships between these maps and the Water Stress Potential (WSP) estimated using soil matric potential measurements. The results were used to model hypothetical WSP maps in the remaining fields. Different placement schemes for temporal soil monitoring sites were evaluated in terms of their ability to predict the hypothetical WSP maps with a different range and magnitude of spatial variability. When a large number of monitoring sites were used, it was shown that the probability for uncertain model predictions was relatively low regardless of the site selection strategy. However, a small number of monitoring sites may be used to reveal the underlying relationship only if these locations are chosen carefully.
文摘This paper describes the specification and implement of a Universal Serial Bus （USB） dual-mode function IP core used for embedded system. Controlled by micro controller/CPU, the novel IP core can function as a USB host controller or USB peripheral controller. When configured as a USB host controller, it supports all USB 1.1 transaction types; supports automatic preamble insertion, and automatic SOF generation and transmission. Otherwise, when it is configured as a USB device by a microprocessor, it operates as a USB peripheral controller comvliant with USB2.0 svecification.
