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排序方式: 共有166条查询结果,搜索用时 31 毫秒
1.
Keen SD Cole DJ 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》2012,42(2):434-443
Recent developments in modeling driver steering control with preview are reviewed. While some validation with experimental data has been presented, the rigorous application of formal system identification methods has not yet been attempted. This paper describes a steering controller based on linear model-predictive control. An indirect identification method that minimizes steering angle prediction error is developed. Special attention is given to filtering the prediction error so as to avoid identification bias that arises from the closed-loop operation of the driver-vehicle system. The identification procedure is applied to data collected from 14 test drivers performing double lane change maneuvers in an instrumented vehicle. It is found that the identification procedure successfully finds parameter values for the model that give small prediction errors. The procedure is also able to distinguish between the different steering strategies adopted by the test drivers. 相似文献
2.
Nuchanart Suealek Thipaporn Tharavanij Robert M. Hackman Carl L. Keen Roberta R. Holt Benjapun Burawat Ammara Chaikan Rattana Tiengtip Panadda Rojpibulstit 《European Journal of Lipid Science and Technology》2021,123(2):2000126
The potential cardiovascular benefit of virgin olive oil (VOO) is widely recognized. However, the use of VOO at very high cooking temperatures makes these oils poorly suited for many Asian dishes. The use of tea seed oil (TSO) is increasing in Thailand, with TSO having a higher smoke point than VOO. The current study examines the effects of daily TSO intake in healthy adults. In a randomized, single-blind crossover design, 12 men consumed for 3 weeks 40 g day−1 of food prepared with either TSO or VOO as a cooking oil. Plasma lipids, thiobarbituric acid reactive substances (TBARS), and oxidant defense enzyme activities are measured before and after each 3-week intervention period. Gas chromatography analysis of TSO and VOO demonstrates that both oils are equally high in monounsaturated fatty acid. The dietary incorporation of TSO and VOO for three weeks reduces low-density lipoprotein cholesterol (LDL-C) concentrations by 15% and 13%, respectively; with total cholesterol (TC) levels lowered by 10% in both groups. No significant changes in TBARS or antioxidant enzyme activity is observed. These results support the concept that Thai TSO can be utilized as a suitable and healthy alternative oil for high-temperature cooking in many Thai and Asian diets. Practical Applications: Tea seed oil from Camellia oleifera grown in Thailand has been recently reported to favorably lower lipid profiles in hamsters fed a high-fat diet in a manner similar to feeding refined olive oil or grapeseed oil. A pilot crossover trial is conducted to compare the effects of three weeks of daily intake of either TSO or VOO in healthy human adults. Consumption of both oils produced significant reductions in TC and LDL-C. Thai TSO leads to favorable lipid profiles and is a reasonable choice for many Thai and Asian food recipes. 相似文献
3.
A proposed method for estimating the electrical conductivity of cement paste pore solution at 25 °C is based on the concentrations of OH−, K+ and Na+. The approach uses an equation that is a function of the solution ionic strength, and requires a single coefficient for each ionic species. To test the method, the conductivity of solutions containing mixtures of potassium hydroxide and sodium hydroxide with molar ratios of 4:1, 2:1 and 1:1, and having ionic strengths varying from 0.15 to 2.00 mol/l were measured in the laboratory and compared to predicted values. The proposed equation predicts the conductivity of the solutions to within 8% over the concentration range investigated. By comparison, the dilute electrolyte assumption that conductivity is linearly proportional to concentration is in error by 36% at 1 mol/l and in error by 55% at 2 mol/l. The significance and utility of the proposed equation is discussed in the context of predicting ionic transport in cement-based systems. 相似文献
4.
S. A. R. Scrivener S. M. Clark N. Keen 《Computer Supported Cooperative Work (CSCW)》1994,2(3):137-157
This paper describes a shared workspace system known as the LookingGlass. The system allows pairs of geographically distributed designers to work together in real-time via a computer-based shared drawing surface, a video link and an audio link. The system integrates many of the features found in previous shared drawing surface systems and additionally provides eye-to-eye contact between the users; awareness of onea's partner's direction of gaze in relation to oneself and the worksurface; and the ability to communicate using gestures in relation to the worksurface.These features are achieved in the LookingGlass system using a technique referred to as video-overlay which combines a full screen video image of a remote partner with a full screen shared drawing surface. Various configurations of video-overlay have been explored and the results of these studies are presented. The results of trials into the suitability of the LookingGlass for various types of design work are also presented and described. 相似文献
5.
Message passing notations (language, package, etc.) typically include some form of asynchronous or synchronous invocation. In a synchronous invocation, the invoker waits for the invocation's servicer to pass back results. Some message passing notations also include early reply or deferred reply (including forwarding), which alters how and when the servicer passes back its results; this additional flexibility is useful in realistic applications. It is well known how to transform a synchronous invocation into only asynchronous invocations. This paper extends such transformations to early reply and forward. This paper also describes the use of these transformations within the implementations of programming notations. Using the transformation simplifies the implementation without significantly affecting run‐time costs. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
6.
Spaceborne synthetic aperture and scatterometer radars currently under development for Earth remote sensing may require the provision of ground calibration targets with very large scattering cross-sections. One way of providing these would be to adapt existing parabolic radio telescopes or satellite Earth station antennas by replacing the feed by a metallic sphere. A dichroic surface would facilitate tracking. 相似文献
7.
8.
A complementary pair of embedding principles for the differential-input earthed-output operational amplifier are combined to obtain a general-purpose resistive embedding which is universal from the strict synthesis point of view in that all four types of controlled source (`transactor?) may be realised with either sign. 相似文献
9.
The r.f. surface reflectivity of a parabolic antenna reflector fabricated from carbon fibre reinforced plastic with high modulus fibres, has been investigated at L- and S-band frequencies by a swept frequency gain comparison method. The gain of the antenna with the reflector uncoated was compared with that of the same unit but with a metal coating on the reflector. 相似文献
10.
The choked waveguide feed antenna, which exhibits E- and H-plane radiation pattern equality, good pattern symmetry and low cross polarisation, is an excellent feed for symmetrical reflector antennas with f/D ratios in the range of about 0.3 to 0.4. An experimental programme has been carried out to determine the variation of beamwidth with feed aperture diameter, and the results are presented here. 相似文献