运用2.4GHz无线技术串连所有装置

随着科技的发达,人们的生活真是越来越舒适了。我们轻松地利用遥控器开启车库大门、电视机、录像机、DVD放映机,我们也能以无线电话、呼叫器、以PDA随时随地进行通讯联络。我们甚至能运用无线技术来监看婴儿房的动静。无线技术已成为生活中不可或缺的一部份,并且被视为理所当然的必须品。还记得必须从沙发上起身去按电视机按钮的日子吗? 现在即使是更换遥控器电池,就会被认为是不方便的事。近年来,我们对无线技术的接纳度已日趋成熟。我们不仅希望使用各种无线装置,更希望这些装置传输速度更快、价格更低廉、并能提供更高的频宽。我们也希望无线装置、家庭剧院系统以及数据网络能具备安全、稳定、以及可靠等特性;并且在彼此紧邻相近时,不会产生相互干扰的现象。而这个趋势将促使现今领先市场的红外线(IR)、27MHz、以及900MHz在内的装置难以继续发展;因此2.4GHz无线技术将取而代之成为市场的主流。     

Calibration control of robot vertical assembly

Calibration methods that apply relative techniques to map robot inaccuracy increase robot flexibility by allowing for greater use and application of off-line path planning techniques. To successfully implement the off-line techniques described in this article, methods have been integrated for off-line tool control frame (TCF) calibration, data base integration, and on-line robot inaccuracy correction. The TCF calibration methods presented in this article successfully determine the TCF origin of the end-effectors and sensors attached to the robot distal link to within the robot repeatability. When the methods were applied to a SEIKO DTRAN RT-3000 robot, the TCP origins were statically predicted correct to within 0.025mm (0.001 in.). On-line methods determine robot inaccuracy by mapping robot configurations relative to operational parts or to spatial templates, in contrast to the contemporary global mapping approaches. For the Seiko robot the resulting inaccuracy distributions permit simple error correction equations to be applied, improving robot positioning accuracy to less than ±0.1 mm in locally large regions and to within the repeatability of the robot ±0.025 mm) in smaller regions. This represents an order-of-magnitude decrease in robot inaccuracy.     

无线芯片商的生存之道

过去两年来,消费品市场的供应链出现一系列深刻的结构调整.无线芯片供应商面临一个关键问题:哪些公司将成为蠢笨的巨人,哪些公司能够灵巧地适应新环境并生存下来?     

Age and sex effects for emotional intensity.

Examined age and sex trends in emotional intensity in 432 Ss from adopting and nonadopting biological families. It was hypothesized that younger adults and females would report greater average levels of both positive and negative affect over time, as has been demonstrated in past research. 242 Ss (parents and offspring) completed a battery of mood scales. 190 Ss completed an affect intensity measure and a general behavior inventory. In support of the hypothesis, women scored higher on measures reflecting emotional intensity and manifestation of cyclothymic symptoms, and the scores on these measures decreased through the adult life span for both males and females. Potential reasons for the differences in emotional intensity are discussed. These include biological causes, cultural expectations, and current life experiences. (35 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Resources, personal strivings, and subjective well-being: A nomothetic and idiographic approach.

The covariation of resources such as money, family support, social skills, and intelligence with subjective well-being (SWB) was assessed in 195 college students. Informant ratings provided an index of resources. Self-reports, daily experience sampling, and informant reports were used to measure SWB. The authors concluded that resources taken together are moderately strong predictors of SWB. This conclusion, however, was qualified by the fact that life satisfaction was more closely related to resources than was affective well-being and that social and personal resources were in general more strongly related to SWB than were material resources. The findings also supported the hypothesis that resources correlate more strongly with SWB when they are relevant to an individual's idiographic personal strivings. A tendency was found for people to choose personal strivings for which they have relevant resources, and the degree of congruence of individuals' goals with resources was predictive of SWB. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Deindividuation, self-awareness, and disinhibition.

Assessed whether lack of self-awareness and conscious planning, group unity, and disinhibited behavior occurred together in deindividuating settings as predicted by E. Diener's (1979) theory of deindividuation. The characteristics and effects of group-induced deindividuation with non-socially-induced non-self-awareness was also compared. The 3 conditions were deindividuated, non-self-aware, and self-aware. After the manipulations, 126 undergraduates chose inhibited vs disinhibited tasks in a supposed "creativity" session, followed by a variety of deindividuation measures. Results reveal that the deindividuation group surpassed the other 2 on the deindividuation factor and on most of the individual measures. For some of the variables, the deindividuation and non-self-aware groups differed significantly, suggesting that deindividuation may not be identical in every respect to lack of self-awareness induced in a non-social way. (35 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Highy oblique impacts into thick and thin targets

Hypervelocity impact (HVI) tests have been conducted at the JSC Hypervelocity Impact Test Facility (HIT-F) with aluminum projectiles impacting semi-infinite (thick) and thin aluminum plates (with plate thickness to projectile diameter ratios of 6.4 and 0.14, respectively) at impact angles ranging from normal to the plate (0°) to highly oblique (88°). The targets were impacted by solid homogeneous aluminum spheres from 1 mm to 3.6 mm diameter. Results of the HVI tests were not unusual up to 65°, where impact damage is characterized as smooth craters and holes that become progressively elliptical and distended along the projectile flight path. Above 65° angles, however, a transition occurs to an irregularly shaped hole in thin materials and rough bottomed crater in thick targets. Above 80°, multiple damage sites in the targets were formed with the damage areas separated by variable distances of undamaged target surface. Analytical and numerical simulations of the impact process at oblique angles above 65° demonstrates that shock compression and release of the projectile into multiple fragments occurs before the projectile fully engages the target. The resulting projectile fragments are then responsible for the multiple impact sites observed on the targets.     

Discriminant validity of well-being measures.

The convergent and discriminant validities of well-being concepts were examined using multitrait-multimethod matrix analyses (D. T. Campbell & D. W. Fiske, 1959) on 3 sets of data. In Study 1, participants completed measures of life satisfaction, positive affect, negative affect, self-esteem, and optimism on 2 occasions 4 weeks apart and also obtained 3 informant ratings. In Study 2, participants completed each of the 5 measures on 2 occasions 2 years apart and collected informant reports at Time 2. In Study 3, participants completed 2 different scales for each of the 5 constructs. Analyses showed that (a) life satisfaction is discriminable from positive and negative affect, (b) positive affect is discriminable from negative affect, (c) life satisfaction is discriminable from optimism and self-esteem, and (d) optimism is separable from trait measures of negative affect. (PsycINFO Database Record (c) 2010 APA, all rights reserved)