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11.
Paul Chul-ho Paik 《Digital Creativity》2013,24(4):310-326
Avatar gender is a basic element of an MMORPG user's identity. Gender customisation in a virtual space is an expansion of identity, an attempt to express oneself in more diverse ways. A survey showed that numerous users manage gender-swapped avatars, and men in particular prefer using female avatars. This study analysed user attitudes toward gender using a Q methodology. In the process, it confirmed the generalisations and motivating factors of gender swapping. The advanced graphic technology and high degree of freedom available in recent MMORPGs has led to an increased demand for avatar physical qualities, and the motives that underlie gender selection have become more diverse and complex. In particular, the notion of experimental and playful creation through customisation has been illuminated and treated as the core consideration of game design. 相似文献
12.
We propose an adaptive unmanned aerial vehicle (UAV)-assisted object recognition algorithm for urban surveillance scenarios. For UAV-assisted surveillance, UAVs are equipped with learning-based object recognition models and can collect surveillance image data. However, owing to the limitations of UAVs regarding power and computational resources, adaptive control must be performed accordingly. Therefore, we introduce a self-adaptive control strategy to maximize the time-averaged recognition performance subject to stability through a formulation based on Lyapunov optimization. Results from performance evaluations on real-world data demonstrate that the proposed algorithm achieves the desired performance improvements. 相似文献
13.
Yeongin Kim Chenxin Zhu Wen-Ya Lee Anna Smith Haowen Ma Xiang Li Donghee Son Naoji Matsuhisa Jaemin Kim Won-Gyu Bae Sung Ho Cho Myung-Gil Kim Tadanori Kurosawa Toru Katsumata John W. F. To Jin Young Oh Seonghyun Paik Soo Jin Kim Lihua Jin Feng Yan Jeffrey B.-H. Tok Zhenan Bao 《Advanced materials (Deerfield Beach, Fla.)》2023,35(1):2203541
Hemispherical image sensors simplify lens designs, reduce optical aberrations, and improve image resolution for compact wide-field-of-view cameras. To achieve hemispherical image sensors, organic materials are promising candidates due to the following advantages: tunability of optoelectronic/spectral response and low-temperature low-cost processes. Here, a photolithographic process is developed to prepare a hemispherical image sensor array using organic thin film photomemory transistors with a density of 308 pixels per square centimeter. This design includes only one photomemory transistor as a single active pixel, in contrast to the conventional pixel architecture, consisting of select/readout/reset transistors and a photodiode. The organic photomemory transistor, comprising light-sensitive organic semiconductor and charge-trapping dielectric, is able to achieve a linear photoresponse (light intensity range, from 1 to 50 W m−2), along with a responsivity as high as 1.6 A W−1 (wavelength = 465 nm) for a dark current of 0.24 A m−2 (drain voltage = −1.5 V). These observed values represent the best responsivity for similar dark currents among all the reported hemispherical image sensor arrays to date. A transfer method was further developed that does not damage organic materials for hemispherical organic photomemory transistor arrays. These developed techniques are scalable and are amenable for other high-resolution 3D organic semiconductor devices. 相似文献
14.
Pu J Paik DS Meng X Roos JE Rubin GD 《IEEE transactions on visualization and computer graphics》2011,17(1):115-124
In three-dimensional medical imaging, segmentation of specific anatomy structure is often a preprocessing step for computer-aided detection/diagnosis (CAD) purposes, and its performance has a significant impact on diagnosis of diseases as well as objective quantitative assessment of therapeutic efficacy. However, the existence of various diseases, image noise or artifacts, and individual anatomical variety generally impose a challenge for accurate segmentation of specific structures. To address these problems, a shape analysis strategy termed "break-and-repair" is presented in this study to facilitate automated medical image segmentation. Similar to surface approximation using a limited number of control points, the basic idea is to remove problematic regions and then estimate a smooth and complete surface shape by representing the remaining regions with high fidelity as an implicit function. The innovation of this shape analysis strategy is the capability of solving challenging medical image segmentation problems in a unified framework, regardless of the variability of anatomical structures in question. In our implementation, principal curvature analysis is used to identify and remove the problematic regions and radial basis function (RBF) based implicit surface fitting is used to achieve a closed (or complete) surface boundary. The feasibility and performance of this strategy are demonstrated by applying it to automated segmentation of two completely different anatomical structures depicted on CT examinations, namely human lungs and pulmonary nodules. Our quantitative experiments on a large number of clinical CT examinations collected from different sources demonstrate the accuracy, robustness, and generality of the shape "break-and-repair" strategy in medical image segmentation. 相似文献
15.
Wonseok Lee Young-bong Bang Kyung-min Lee Bu-hyun Shin Jamie Kyujin Paik In-su Kim 《International Journal of Control, Automation and Systems》2010,8(5):1072-1081
Conventional robot motion teaching methods use a teaching pendant or a motion capture device and are not the most convenient
or intuitive ways to teach a robot sophisticated and fluid movements such as martial arts motions. Ideally, a robot could
be set up as if it were a clothing mannequin that has light limbs and flexible yet frictional joints which can be positioned
at desirable shape and hold all the positions. To do the same with a robot, an operator could pull or push the links with
minor forces until the desired robot posture is attained. For this, a robot should measure the applied external force by using
torque sensors at the robot joints. However, torque sensors are bulky and expensive to install in every DOF joints while keeping
a compact design, which is essential to humanoid robots. In this paper, we use only motor current readings to acquire joint
torques. The equations used to compensate for the effect of gravity on the joint torques and the self-calibration method to
earn link parameters are presented. Additionally, kinematic restrictions can be imposed on the robot’s arms to simplify the
motion teaching. Here, we teach the Kendo training robot with this method and the robot’s learnt martial art motions are demonstrated. 相似文献
16.
The aim of this paper is to provide a composite likelihood approach to handle spatially correlated survival data using pairwise joint distributions. With e-commerce data, a recent question of interest in marketing research has been to describe spatially clustered purchasing behavior and to assess whether geographic distance is the appropriate metric to describe purchasing dependence. We present a model for the dependence structure of time-to-event data subject to spatial dependence to characterize purchasing behavior from the motivating example from e-commerce data. We assume the Farlie-Gumbel-Morgenstern (FGM) distribution and then model the dependence parameter as a function of geographic and demographic pairwise distances. For estimation of the dependence parameters, we present pairwise composite likelihood equations. We prove that the resulting estimators exhibit key properties of consistency and asymptotic normality under certain regularity conditions in the increasing-domain framework of spatial asymptotic theory. 相似文献
17.
Kyung-Hoon Hyun Sangkyu Lee Chae-Woong Cho Ungyu Paik Dae-Hwan Kim Eun-Sang Na Jea-Gun Park 《Journal of Electroceramics》2006,17(2-4):351-354
An attempt was made to improve the conventional lamination process in the multilayered ceramic capacitors (MLCCs) fabrication by adapting a solvent treatment on the BaTiO3 green sheets. During the lamination process, additional particle rearrangement in the BaTiO3 green block was stimulated by solvent treatment. This rearrangement resulted in a more compact structure of the BaTiO3 green sheets compared to that obtained through the conventional lamination process. The overall thickness of BaTiO3/Ni/BaTiO3 laminates was also reduced after solvent treatment. It is suggested that miniaturization in the fabrication of MLCCs can be improved by adapting a solvent treatment during the lamination process. 相似文献
18.
Youngha Kim Sungkwan Kim Young-Ah Jeon Yunseok Kim Hanjong Paik Yangsoo Kim Sang-Chul Han Young-Hee Han Nyeon-Ho Jeong Tae-Hyun Sung Jong-In Hong Kwangsoo No 《Journal of Electroceramics》2006,17(2-4):1063-1067
YBa2Cu3Ox (Y123) superconducting films were fabricated on Cu substrates using a simple screen-printing method, from Cu-free powders
(Y2O3 and BaCO3). In the process, CuO, which causes superconducting properties of Y123 films to deteriorate, was formed on the film surface.
By varying the atomic ratio of Y to Ba (Y:Ba = 1:1∼1:4), the ratio needed to prevent CuO formation was found for the film
surface that had been heat-treated at 980∘C for 17 s. The film, with the ratio of Y to Ba (Y:Ba = 1:1), is reheat-treated at 930∘C for 9 min 30 s to form a superconducting Y123 phase. It was possible to prevent CuO formation by controlling the ratio of
Cu-free powders in the mixture and to fabricate YBCO superconductors on Cu substrates using a two-step heat-treatment. 相似文献
19.
Juhyun Yoo Changbae Lee Yeongho Jeong Kwanghyun Chung Duckchool Lee Dongsoo Paik 《Materials Chemistry and Physics》2005,90(2-3):386-390
PMN-PZT ceramics doped with Li2CO3 and Bi2O3 as sintering aids were manufactured in order to develop the low temperature sintering ceramics for multilayer piezoelectric transformer, and their micro structural, dielectric and piezoelectric properties were investigated. The sintering aids were proved to lower the sintering temperature of doped PMN-PZT ceramics due to the effect of LiBiO2 liquid phase. Optimal values for multilayer piezoelectric transformer application, such as electromechanical coupling factor (kp) of 0.50, mechanical quality factor (Qm) of 2264, and dielectric constant (K) of 1216, and curie temperature (Tc) of 317 °C were found at 0.1 wt.% Li2CO3 added ceramics sintered at 940 °C. 相似文献
20.
Point fingerprint: a new 3-D object representation scheme 总被引:1,自引:0,他引:1
Yiyong Sun Joonki Paik Koschan A. Page D.L. Abidi M.A. 《IEEE transactions on systems, man, and cybernetics. Part B, Cybernetics》2003,33(4):712-717
This paper proposes a new, efficient surface representation method for surface matching. A feature carrier for a surface point, which is a set of two-dimensional (2-D) contours that are the projections of geodesic circles on the tangent plane, is generated. The carrier is named point fingerprint because its pattern is similar to human fingerprints and plays a role in discriminating surface points. Corresponding points on surfaces from different views are found by comparing their fingerprints. The point fingerprint is able to carry curvature, color, and other information which can improve matching accuracy, and the matching process is faster than 2-D image comparison. A novel candidate point selection method based on the fingerprint irregularity is introduced. Point fingerprint is successfully applied to pose estimation of real range data. 相似文献