蓝牙技术在医疗上的应用--可远程、安全、轻松地收集和存取病人数据

在个人数字助理(PDA)、笔记本电脑和蜂窝电话上使用蓝牙技术的产品,正在更加方便、可靠地通过远程、无线方式收集病人数据.这一现象使医疗设备制造商正在重新考虑通过蓝牙技术收集、处理和整理病人的数据.特别是,蓝牙技术的电缆替代能力、低功耗、高可移动性和近距离安全特性,使医疗设备制造商更希望使用这一技术.蓝牙技术最初只是一种电缆替代技术,现在它的发展已经远远超出了最初的设计,并仍在不断向前发展,成为一种能够为各种标准设备和Ad-Hoc(自组织网络)网络提供接入的技术.     

3G移动电话的系统级LSI

引言 无线移动电话仅具备语音功能的时代已经离我们远去了.目前的3G手机更多的是作为多媒体系统,提供彩显、游戏、音频、视频、相机、蓝牙、GPS、WLAN、高速广域数据服务以及其他高级特性.由于功能非常之多,因此处理新型3G电话比处理仅有语音功能的2G电话要复杂5倍至10倍,在应用处理方面则要求更高.     

通往10 Gbps以太网的低速之路

较低的速度通常不能算是创新，但在10 Gbps以太网的领域内，两种“低速”互连标准，即LX4和CX4，正在降低实现成本，并实现新的应用。     

High performance GaAs MESFETs with molecular implanted and optimized lowly-doped drain structure for maximized speed, gain and breakdown performance

GaAs MESFETs with novel lowly-doped drain structures have been developed utilizing molecular implants of silicon trifluoride. Short-channel effects in the 1/4 μm enhancement- and depletion-mode transistors have been suppressed with drain-induced barrier height lowering of less than 70 mV/V and pinch-off voltage shifts of less than 220 mV as the gate length was scaled from 1.0 to 1/4 μm. The 3-terminal breakdown, the transconductance to output conductance ratio, and the unity current gain, cut-off frequency were simultaneously optimized. The E-mode device possessed breakdown of >10 V, G_m · R_ds > 9.5, F_t > 55 GHz, and nominal on-resistance of 2.1 Ω mm while the D-mode device had breakdown >10 V, G_m · R_ds > 6.0, F_t > 45 GHz, and nominal on-resistance of 1.9 Ω mm. These optimized transistors enabled the realization of a variety of low-power digital and high-power mixed signal circuits, using 3-level source-coupled transistor and common-mode logic, such as laser and electro-optic drivers, highly integrated transceivers, multiplexers, demultiplexers, and clock data recover circuits.     

芯片尺寸是否越大越好?

把更多的功能和更多的门电路集成在一块芯片上的能力——无论你将这块芯片称为SoC(单片系统)、ASIC(专用集成电路)还是称为一块大型集成电路——正在迅速提高。在亚微米设计和亚微米制造工艺的推动下,以及在更好的EDA工具和程序库的支持下,人们可以把数百万个子电路集成在一块硅片上。这种情况也许会有人认为,一种定制的、一块集成电路的体系结构——或许还能得到几个新奇而又     

Cholinergic vasoconstrictor effects in the rabbit eye: vasomotor effects of pentobarbital anesthesia

Oculomotor nerve stimulation causes vasoconstriction in the anterior uvea, which is due partly to a muscarinic mechanism and partly to a non-sympathetic aminergic mechanism. The labelled microsphere method was used to analyze the effect of pentobarbital anesthesia on the resting cholinergic vasomotor tone in the anterior uvea and to determine the relationship between stimulation frequency and vasomotor response. An attempt was made also to ascertain whether the aminergic part of the vasoconstriction is caused by release of 5-hydroxytryptamine or norepinephrine. Induction of pentobarbital anesthesia caused a marked vasodilation in the iris and the ciliary processes and a subsequent muscarinic blockade had no effect on the blood flow. A similar result was obtained in the optic nerve. In the choroid plexus, heart muscle, pineal body and coecum, pentobarbital anesthesia caused vasodilation and a subsequent muscarinic blockade caused vasoconstriction. In the brain pentobarbital anesthesia caused a marked reduction in the blood flow of the grey matter and a moderate reduction in the white matter. After a muscarinic blockade there was some increase in the blood flow of the grey matter. Stimulation of the oculomotor nerve caused near maximum vasomotor responses at 10-20 Hz; maximum effect on the pupil size was obtained at 40-50 Hz. Depletion of 5-hydroxytryptamine with fenfluramine did not prevent the aminergic part of the vasoconstriction and a marked vasoconstriction was also observed after pretreatment with reserpine. The results indicate the pentobarbital anesthesia abolishes most of the spontaneous cholinergic vasoconstrictor tone of the anterior uvea and that the aminergic part of the oculomotor nerve induced vasoconstriction is caused by the stimulation of phentolamine-sensitive receptors by a mechanism probably not involving release of norepinephrine or 5-hydroxytryptamine.     

Generativity and social motives in young adults.

Different forms of generativity in the writings of E. H. Erikson (1950/1963) and J. Kotre (1984) were related to agentic and communal motives in a sample of young adults (M?=?28 yrs old). For women, the power motive related to parenting, whereas the achievement motive was associated with forms of generative expression outside of the household. The opposite pattern of achievement and power motive relationships was found for men, although in a weaker form. The affiliation–intimacy motive, on the other hand, related both to women's parenting and societal concerns. Differences in expectations and opportunities for young men and women may account for these gender differences. The results for women support D. P. McAdams's (1988) suggestions that agency and communion are important for understanding generativity. In addition, the results provide evidence that people begin to grapple with generative issues as young adults. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Linux加速便携式信息家电投放市场

Internet网上的信息家电或Web设备当前最流行的是用Linux操作系统作为嵌入式软件的开发平台。嵌入式Linux供应商打上“Linux Inside”标签,用开发快捷、省钱、甚至以潜在的股票为卖点。撇开广告宣传不谈,有经验的厂家经过慎重的商业和技术考虑也选用Linux。其实,选用Linux最重要的原因在于：它能够加速信息家电投放市场。便携式信息家电的生产周期特别短,手机、PDA等的上市时间一般只要6～9个月时间。封锁源码的专利软件商因资源有限,无法跟上产品如此快速上市的节奏。形成强烈对比的是,在基于Internet的全球开放源码的活动中,…     

Longitudinal analysis of midlife generativity, intergenerational roles, and caregiving.

Items from California Adult Q-Sort (CAQ) were used to assess psychosocial generativity (E. H. Erikson, 1950) in a sample of educated women at midlife. CAQ scores measured at age 43 demonstrated convergent validity with an inventory measure of generativity assessed at age 53. According to other longitudinal analyses, women who attained a generative stance at age 43 reported greater investment 10 years later in intergenerational roles (e.g. daughter, mother) but not nonintergenerational ones (e.g. friend, sister). Generative women also reported less subjective burden in caring for aging parents and more knowledge about community elder care programs. Further evidence suggests that participants felt embedded in a reciprocal caregiving network in which they themselves are recipients of care. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Dark Side of E-commerce — Cracking the Code or Passing the Buck?

In what may turn out to be one of the most interesting incidents of early 21st century electronic business, a French company, Canal+ Group and two subsidiaries recently filed a lawsuit in US District Court for Northern California against NDS Group [NASDAQ:NNDS]. The basis for the complaint is that NDS, a UK-based company ‘spent large amounts of money and resources’ to break the security system underlying Canal+’s digital TV smartcard. The suit claims that NDS masterminded ‘a conspiracy to harm Canal+’s competitive position in the digital television market.’ The plaintiffs allege violations of US copyright law and the Racketeer Influenced and Corrupt Organizations Act, as well as the California Unfair Competition statute, all of which carry very serious penalties.