排序方式: 共有56条查询结果,搜索用时 31 毫秒
1.
Lee Jusang Chung Minyoung Lee Minkyung Shin Yeong-Gil 《Multimedia Tools and Applications》2022,81(13):18327-18342
Multimedia Tools and Applications - Individual tooth segmentation and identification from cone-beam computed tomography images are preoperative prerequisites for orthodontic treatments. Instance... 相似文献
2.
Most blind and vision-impaired people use a white cane or a guide dog to aid their walking. The conventional white cane helps
the user to perceive the environment simply by identifying the presence of nearby obstacles. In the present study, three infrared
range sensors were used to identify the floor state. The sensor system, affixed to the user’s belt, does not require swinging
motion or any other movement by the user. The three sensors are configured radially, and the design parameters are selected
based on the sensor characteristics. The main difference from the conventional range sensor system for the blind is that the
infrared range sensor system identifies three discrete states (even surface, ascending stair, descending stair). The condition
for the state transition was derived from a sensor system model. Additionally, the effects of sensor system movement were
verified by covariance analysis. 相似文献
3.
Il-Nyoung YoonYoungsun Lee Docki KangJungsik Min Jongok Won Minyoung KimYong Soo Kang Sung-ho KimJeong-Jin Kim 《International Journal of Adhesion and Adhesives》2011,31(2):119-125
Color-stable hydrogenated Bisphenol A (HBA) epoxy adhesives, containing organic-inorganic hybrid nanomaterials, were prepared and their properties investigated. Poly(propylene glycol)bis(2-aminopropyl ether) (D230) was used as the room temperature curing agent, and functional organic-inorganic hybrid nanomaterials, to tailor the adhesives, were prepared by a sol-gel reaction of 3-glycidoxypropyltrimethoxysilane and tetraethoxysilane. The commercial polyhedral oligomeric silsesquioxanes (POSS) having epoxy functional groups were also used. The concentration dependence of different nanomaterials, containing epoxy functional group for HBA/D230 adhesives, was studied. The tensile strength increased with the addition of nanomaterials having glycidyl epoxy group; however, the dependence varied with the size, the number of functional groups, and the amount of the addition. HBA/D230 adhesives containing different amounts of nanomaterials, whose compositions are similar to that of granite, were applied to the Korean granite and the results were compared with those obtained by using commercial adhesives, which have the problem of significant color change and high viscosity. The mechanical properties of HBA/D230 adhesives, containing POSS having glycidyl epoxy group, are found to be similar to those of commercial adhesives. Besides, it has low viscosity and long-term color stability. 相似文献
4.
Jin-Hyeok Park Seok-Ju Kim Tae-Gyeong Eom Minyoung Seo Young-Gi Song Feng Tang Young Gyu Jeong 《应用聚合物科学杂志》2024,141(6):e54922
This article aims to investigate the impact of reduced graphene oxide (RGO) nanofillers on the curing kinetics, thermal stability, mechanical modulus, electrical conductivity, and EMI shielding effectiveness of unsaturated polyester resin (UPR). The curing rates of UPR/styrene (60/40 by wt%) mixtures with small amounts of RGO (0.1–0.3 wt%) exhibit slight delays owing to the barrier and scavenger roles of 2-dimensional RGO sheets. Nonetheless, it is observed that within the cured nanocomposites, RGOs are effectively dispersed and firmly bonded to the UPR matrix at interfaces through hydrogen bonding and π-π interactions. Consequently, the nanocomposites display heightened thermal decomposition temperatures and increased residue at 800°C with higher RGO loading content. The addition of RGO notably improves the elastic storage modulus and increases the temperature associated with glass transition-related relaxation. The electrical percolation threshold is attained at a specific RGO loading between 0.2 and 0.3 wt%. Thus, the nanocomposite with 0.3 wt% RGO is characterized to have an electrical conductivity of 1.9 × 10−6 S/cm and an EMI shielding effectiveness of ~9 dB at 8 GHz, for a thickness of 1 mm. 相似文献
5.
Minyoung Lee 《Metallurgical and Materials Transactions A》1983,14(8):1625-1629
The effect of crystallographic orientation and test temperature on hardness of WC single crystals was investigated along with
the hot hardness of poly crystalline tungsten carbide. Also investigated was the effect of carbide grain size and the amount
of binder phase on the hot hardness of some cemented tungsten carbides. The hot hardness of single crystal WC on all major
crystallographic orientations evaluated decreases very rapidly for increasing temperature, and the single crystal hardness
on its hardest orientation is only about half of the polycrystalline material depending on the test temperature. Because of
its polycrystalline character, some cobalt bonded cemented tungsten carbides can be harder than single crystal WC over some
intermediate temperature range. 相似文献
6.
Source tracking of microbial intrusion in water systems using artificial neural networks 总被引:3,自引:0,他引:3
A "what-if" scenario where biological agents are accidentally or deliberately introduced into a water system was generated, and artificial neural network (ANN) models were applied to identify the pathogenic release location to isolate the contaminated area and minimize its hazards. The spatiotemporal distribution of Escherichia coli 15597 along the water system was employed to locate pollutants by inversely interpreting transport patterns of E. coli using ANNs. Results showed that dispersion patterns of E. coli were positively correlated to pH, turbidity, and conductivity (R2=0.90-0.96), and the ANN models successfully identified the source location of E. coli introduced into a given system with 75% accuracy based on the pre-programmed relationships between E. coli transport patterns and release locations. The findings in this study will enable us to assess the vulnerability of essential water systems, establish the early warning system and protect humans and the environment. 相似文献
7.
Minyoung Jeong Se Gyo Han Woong Sung Seunghyun Kim Jiwoo Min Mi Kyong Kim Wookjin Choi Hansol Lee Dongki Lee Min Kim Kilwon Cho 《Advanced functional materials》2023,33(27):2300695
A photomultiplication (PM)-type organic photodetector (OPD) that exploits the ionic motion in CsPbI3 perovskite quantum dots (QDs) is demonstrated. The device uses a QD monolayer as a PM-inducing interlayer and a donor–acceptor bulk heterojunction (BHJ) layer as a photoactive layer. When the device is illuminated, negative ions in the CsPbI3 QD migrate and accumulate near the interface between the QDs and the electrode; these processes induce hole injection from the electrode and yield the PM phenomenon with an external quantum efficiency (EQE) >2000% at a 3 V applied bias. It is confirmed that the ionic motion of the CsPbI3 QDs can induce a shift in the work function of the QD/electrode interface and that the dynamics of ionic motion determines the response speed of the device. The PM OPD showed a large EQE-bandwidth product >106 Hz with a −3 dB frequency of 125 kHz at 3 V, which is one of the highest response speeds reported for a PM OPD. The PM-inducing strategy that exploits ionic motion of the interlayer is a potential approach to achieving high-efficiency PM OPDs. 相似文献
8.
We address the sequence classification problem using a probabilistic model based on hidden Markov models (HMMs). In contrast
to commonly-used likelihood-based learning methods such as the joint/conditional maximum likelihood estimator, we introduce
a discriminative learning algorithm that focuses on class margin maximization. Our approach has two main advantages: (i) As
an extension of support vector machines (SVMs) to sequential, non-Euclidean data, the approach inherits benefits of margin-based
classifiers, such as the provable generalization error bounds. (ii) Unlike many algorithms based on non-parametric estimation
of similarity measures that enforce weak constraints on the data domain, our approach utilizes the HMM’s latent Markov structure
to regularize the model in the high-dimensional sequence space. We demonstrate significant improvements in classification
performance of the proposed method in an extensive set of evaluations on time-series sequence data that frequently appear
in data mining and computer vision domains. 相似文献
9.
Journal of Intelligent Manufacturing - The deep learning (DL) model has performed successfully in various fields, including manufacturing. DL models for defect image data analysis in the... 相似文献
10.
Young Geun Kim Minyong Kim Jae Min Kim Minyoung Sung Sung Woo Chung 《ETRI Journal》2015,37(1):157-164
As GPU power consumption in smartphones increases with more advanced graphic performance, it becomes essential to estimate GPU power consumption accurately. The conventional GPU power model assumes, simply, that a GPU consumes constant power when turned on; however, this is no longer true for recent smartphone GPUs. In this paper, we propose an accurate GPU power model for smartphones, considering newly adopted dynamic voltage and frequency scaling. For the proposed GPU power model, our evaluation results show that the error rate for system power estimation is as low as 2.9%, on average, and 4.6% in the worst case. 相似文献