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51.
In face examinations, gender classification (GC) is one of several fundamental tasks. Recent literature on GC primarily utilizes datasets containing high‐resolution images of faces captured in uncontrolled real‐world settings. In contrast, there have been few efforts that focus on utilizing low‐resolution images of faces in GC. We propose a GC method based on a pixel classifier boosting with modified census transform features. Experiments are conducted using large datasets, such as Labeled Faces in the Wild and The Images of Groups, and standard protocols of GC communities. Experimental results show that, despite using low‐resolution facial images that have a 15‐pixel inter‐ocular distance, the proposed method records a higher classification rate compared to current state‐of‐the‐art GC algorithms. 相似文献
52.
53.
Evaluation of seismic behaviour of steel special moment frame buildings with vertical irregularities
Kien Le‐Trung Kihak Lee Jaehong Lee Do Hyung Lee 《The Structural Design of Tall and Special Buildings》2012,21(3):215-232
This paper concentrates on investigating the seismic behaviours of vertically irregular steel special moment frame (SMF) buildings by comparison with the regular counterpart. All buildings in this study were assumed to be located in Los Angeles, and subjected to 20 earthquake ground motions with a seismic hazard level of 2% probability of exceedance in 50 years. The beam–column connections of the buildings were modelled to consider the panel zone deformation. In addition, a ductile connection model accompanied by strength degradation was incorporated to the analysis programme in an effort to obtain more accurate response results. Three types of irregularities (mass, stiffness and strength irregularity) specified as vertical irregularities in the IBC 2000 provisions were imposed to the original building. Nonlinear static and dynamic analyses were performed, and the confidence levels of which the performance objective will be satisfied were calculated as well. The effects of different irregularity types and levels on the seismic behaviours of the buildings were investigated and discussed in terms of the height‐wise distribution of storey drifts, maximum storey drift demands, global collapse storey drift capacities and confidence levels. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
54.
Jung-Il Kim Seok-Gy Jeon Geun-Ju Kim Jaehong Kim Huyn-Haeng Lee Si-Hyun Park 《Journal of Infrared, Millimeter and Terahertz Waves》2012,33(2):206-211
The fabrication of two-dimensional terahertz photonic crystals using wet chemical etching of high-resistivity silicon is described.
Wet-etched photonic crystals with a sloped sidewall were fabricated in 16 × 10 square lattices with a period of 1430 μm and
a height of 150 μm, and were bonded between two parallel Au-coated silicon wafers for tight confinement in the vertical direction.
The formation of a photonic band gap at a frequency of about 0.1 THz with a width of 14 GHz is demonstrated by the experimental
results and the numerical simulations of the transmission frequency spectrum for the transverse magnetic mode. 相似文献
55.
Ketterer Holly L.; Han Kyunghee; Hur Jaehong; Moon Kyungjoo 《Canadian Metallurgical Quarterly》2010,22(3):504
In response to the concern that Minnesota Multiphasic Personality Inventory-2 (MMPI-2; J. N. Butcher, W. Dahlstrom, J. R. Graham, A. Tellegen, & B. Kaemmer, 1989; J. N. Butcher et al., 2001) Variable Response Inconsistency (VRIN) and True Response Inconsistency (TRIN) score invalidity criteria recommended for use with American samples results in an excessive number of exclusions in Asian samples (F. M. Cheung, W. Z. Song, & J. X. Zhang, 1996), we examined the cross cultural equivalence of the original VRIN and TRIN scales, and developed and validated Korean-specific VRIN and TRIN scales with Korean adult normative, clinical, and college samples. Although the results from item pair correlation analyses suggested the superiority of the Korean VRIN and TRIN over the original VRIN and TRIN, the mean comparison results and classification accuracy statistics using data with varying degrees of randomly inserted true and/or false responses did not reveal a strong advantage of one version over the other. We present and discuss plausible causes of the findings. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
56.
Hybrid deposition method was used to prepare CrNx/amorphous-WC (CrNx/a-WC) films. The effect of the arc ion plating and direct current magnetron sputtering on the changes in microstructure and properties such as hardness and thermal stability were studied. The amorphous WC phase of the CrNx/a-WC films was confirmed by X-ray photoelectron spectroscopy and high resolution transmission electron microscopy. A bi-phase nanocomposite kinetic model and the Koehler's theory were used to explain the growth mechanism of CrNx/a-WC films. A superhard superlattice Cr2N/a-WC film with hardness up to ~ 48 GPa was abtained. The CrN/a-WC films displayed better resistance to oxidation than pure CrN and CrN-based films. As such, CrNx/a-WC nanocomposite films are very promising for high-speed drying machines and other high-temperature applications. 相似文献
57.
Rate-compatible puncturing of low-density parity-check codes 总被引:5,自引:0,他引:5
Jeongseok Ha Jaehong Kim McLaughlin S.W. 《IEEE transactions on information theory / Professional Technical Group on Information Theory》2004,50(11):2824-2836
In this correspondence, we consider puncturing of low-density parity-check (LDPC) codes for additive white Gaussian noise (AWGN) channels. We show that good puncturing patterns exist and that the puncturing can be performed in a rate-compatible fashion. Furthermore, rate-compatible puncturing results in a small loss of performance with respect to threshold, namely, the punctured code is good (in terms of threshold) across a range of rates when compared with the optimal codes for each rate. This allows one to implement a single "mother" encoder and decoder that is good across a wide range of rates. 相似文献
58.
Chaebeen Kwon Sanghyeon Lee Chihyeong Won Kyu Hyoung Lee Minyoung Kim Jaehong Lee Seung-Jae Yang Minkyu Lee Seungmin Lee Kukro Yoon Sungjoon Cho Taeyoon Lee 《Advanced functional materials》2023,33(26):2300092
Fiber-based electronics are essential components for human-friendly wearable devices due to their flexibility, stretchability, and wearing comfort. Many thermoelectric (TE) fabrics are investigated with diverse materials and manufacturing methods to meet these potential demands. Despite such advancements, applying inorganic TE materials to stretchable platforms remains challenging, constraining their broad adoption in wearable electronics. Herein, a multi-functional and stretchable bismuth telluride (Bi2Te3) TE fabric is fabricated by in situ reduction to optimize the formation of Bi2Te3 nanoparticles (NPs) inside and outside of cotton fabric. Due to the high durability of Bi2Te3 NP networks, the Bi2Te3 TE fabric exhibits excellent electrical reliability under 10,000 cycles of both stretching and compression. Interestingly, intrinsic negative piezoresistance of Bi2Te3 NPs under lateral strain is found, which is caused by the band gap change. Furthermore, the TE unit achieves a power factor of 25.77 µWm−1K−2 with electrical conductivity of 36.7 Scm−1 and a Seebeck coefficient of −83.79 µVK−1 at room temperature. The Bi2Te3 TE fabric is applied to a system that can detect both normal pressure and temperature difference. Balance weight and a finger put on top of the 3 × 3 Bi2Te3 fabric assembly are differentiated through the sensing system in real time. 相似文献
59.
Janghoon Woo Hyeokjun Lee Changyoon Yi Jaehong Lee Chihyeong Won Saehyuck Oh Janghwan Jekal Chaebeen Kwon Sanggeun Lee Jaekang Song Byungwoo Choi Kyung‐In Jang Taeyoon Lee 《Advanced functional materials》2020,30(29)
Stretchable interconnects with invariable conductivity and complete elasticity, which return to their original shape without morphological hysteresis, are attractive for the development of stretchable electronics. In this study, a polydimethylsiloxane‐coated multifilament polyurethane‐based helical conductive fiber is developed. The stretchable helical fibers exhibit remarkable electrical performance under stretching, negligible electrical and mechanical hysteresis, and high electrical reliability under repetitive deformation (10 000 cycles of stretching with 100% strain). The resistance of the helical fibers barely increases until the applied strain reaches the critical strain, which is based on the helical diameter of each fiber. According to finite element analysis, uniform stress distribution is maintained in the helical fibers even under full stretching, owing to the fibers' true helix structure. In addition, the stretchable helical fibers have the ability to completely return to their original shapes even after being fully compressed in the vertical direction. Cylinder‐shaped connecting pieces made using 3D printing are designed for stable connection between the helical fibers and commercial components. A deformable light‐emitting diode (LED) array and biaxially stretchable LED display are fabricated using helical fibers. A skin‐mountable band‐type oximeter with helical fiber‐based electrodes is also fabricated and used to demonstrate real‐time detection of cardiac activities and analysis of brain activities. 相似文献
60.
Heetak Han Sangyul Baik Borui Xu Jungmok Seo Sanggeun Lee Sera Shin Jaehong Lee Ja Hoon Koo Yongfeng Mei Changhyun Pang Taeyoon Lee 《Advanced functional materials》2017,27(29)
Nanoscale architectures found in nature have unique functionalities and their discovery has led to significant advancements in various fields including optics, wetting, and adhesion. The sensilla of arthropods, comprised of unique hierarchical structures, are a representative example which inspired the development of various bioinspired systems, owing to their hypersensitive and ultrafast responsivity to mechanical and chemical stimuli. This report presents a geometry‐switchable and highly H2‐reactive Janus nanofiber (H‐NF) array inspired by the structural features of the arthropod sensilla. The H‐NF array (400 nm diameter, 4 µm height, 1.2 µm spacing distance, and hexagonal array) exhibits reversible structural deformation when exposed to a flammable concentration of hydrogen gas (4 vol% H2 in N2) with fast response times (5.1 s). The structural change can be detected with the bare eye, which is a result of change in the optical transmittance due to the structural deformation of the H‐NF array. Based on these results, an eye‐readable H2‐sensor that requires no additional electrical apparatus is demonstrated, including wetting‐controllable H2‐selective smart surfaces and H2‐responsive fasteners. 相似文献