Local Stereo Matching Using an VariableWindow, Census Transform and an Edge-preserving Filter

Vinh Quang Dinh,Dung Duc Nguyen,Vinh Dinh Nguyen,Jae Wook Jeon 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

In this paper, we propose an alternative blocking-matching approach to the correspondence problem in stereo matching. In blocking-matching algorithms, a local window is used to measure the similarity (or dissimilarity) between pixels of a stereo pair. Although some area-based stereo matching methods have been developed and work well in many kinds of regions such as textureless or object boundary regions, their performance can degrade when working in some types of radiometric conditions. Our proposed algorithm is an improved method that uses a non-parametric transform in the pre-processing step and an edge-preserving filter in the post-processing step. Input images are first pre-processed by the census transform, which makes the proposed method more robust when the image pair is captured in different light sources or camera exposure conditions. The window cost in our approach is computed from the transformed images using the Hamming distance, and the correspondence is finally chosen by a Winner-Takes-All strategy. The experimental results for the Middleburry images show that the proposed method outperforms test local stereo methods in radiometrically different images.

The Influence of Responsibility Shift on Warehousing Performance: The Case of Australia

Vinh V. THAI,Vinh V. THAI,Zaheed HALIM 한국해운물류학회 2019 The Asian journal of shipping and Logistics Vol.35 No.1

Although there have been extensive efforts to eliminate the use of warehousing due to its large requirement of resources, the need to connect manufacturing with end consumers will be difficult to coordinate without it. In Australia, the rapid advance of warehousing has facilitated the challenging demands of customers. In the literature, the challenges of increasing reliability, space utilisation, and reducing waste have been managed through improved warehousing processes and technology; however, the important role of employees through responsibility shift in enhancing warehousing performance has not yet been fully explored. This study therefore examines the relationship between the employment of Responsibility Shift (RS) and Warehousing Performance (WP) in Australia within the processes of Inbounding and Storage through the usage of a survey conducted with department supervisors and managers of warehousing companies which were members of the Chartered Institute of Logistics and Transport in Australia (CILTA) and Supply Chain and Logistics Association of Australia (SCLAA). It was found that RS positively causes a statistically significant influence on warehousing performance. This research contributes to enrich the literature on RS as it is perhaps the first study which examines the effects of RS on warehousing performance in Australia while also enables warehousing managers to explore ways to improve warehousing performance from the human resource management perspective. Although being significant both in terms of managerial and academic implications, the generalizability of this research is limited from a small sample size. Future research, therefore, needs to look into a wider population as well as further investigation into the effects of Responsibility Shift in the rapidly developing warehousing business environment elsewhere in the world.

Fuzzy Encoding Pattern for Stereo Matching Cost

Dinh, Vinh Quang,Nguyen, Vinh Dinh,Van Nguyen, Hau,Jeon, Jae Wook IEEE 2016 IEEE Transactions on Circuits and Systems for Vide Vol.26 No.7

<P>We propose a novel fuzzy encoding pattern that fuzzily encodes the relative orders between pixel pairs. An image window is divided into disjoint neighboring pixel sets for the window's center pixel, and the relative order is established not only between the center pixel and its neighbors but also between the pixel pairs in each neighboring pixel set. The relative orders are fuzzily encoded to extract more detailed information from a local structure. We successfully apply the pattern as a matching cost function for stereo correspondence under severe radiometric variations. We conduct experiments using the proposed matching cost function and compare it with functions employing the census transform, supporting local binary pattern, and adaptive normalized cross correlation, as well as a mutual information-based matching cost function, using different stereo data sets. Compared with the census transform, the proposed function reduces the error from 33.1% to 16.9% in the Middlebury data set and from 17.6% to 9.5% in the Kitti data set. The experimental results indicate that the proposed function is superior to the state-of-the-art functions under radiometric variations. In addition, the proposed function is faster than recently developed functions, such as the adaptive normalized cross correlation, a mutual information-based function, and support local binary pattern.</P>

Shear resistance behaviors of a newly puzzle shape of crestbond rib shear connector: An experimental study

Thi Hai Vinh Chu,Duy Kien Dao,Duc Vinh Bui,Van Phuoc Nhan Le,김인태,안진희 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.5

A newly puzzle shape of crestbond rib shear connector is a type of ductile perfobond rib shear connector. This shear connector has some advantages, including relatively easy rebar installation and cutting, as well as the higher shear resistance strength. Thus, this study proposed a newly puzzle shape of crestbond rib with a "Ʊ" shape, and its shear resistance behaviors and shear strengths were examined using push-out tests. Five main parameters were considered in the push-out specimens to evaluate the effects of shear resistance parameters such as the dimensions of the crestbond rib, transverse rebars in the crestbond dowel, concrete strength, rebar strength, and dowel action on the shear strength. The shear loading test results were used to compare the changes in the shear behaviors, failure modes, and shear strengths. It was found that the concrete strength and number of transverse rebars in the crestbond rib were significantly related to its shear resistance. After the initial bearing resistance behavior of the concrete dowel, a relative slip occurred in all the specimens. However, its rigid behavior to shear loading decreased the ductility of the shear connection. The cross-sectional area of the crestbond rib was also shown to have a minor effect on the shear resistance of the crestbond rib shear connector. The failure mechanism of the crestbond rib shear connector was complex, and included compression, shear, and tension. As a failure mode, a crack was initiated in the middle of the concrete slab in a vertical direction, and propagated with increasing shear load. Then, horizontal cracks occurred and propagated to the front and rear faces of the specimens. Based on the results of this study, a design shear strength equation was proposed and compared with previously suggested equations.

High-Efficiency Heterojunction with Intrinsic Thin-Layer Solar Cells

Vinh Ai Dao,Sangho Kim,Youngseok Lee,Sunbo Kim,Jinjoo Park,Shihyun Ahn,Junsin Yi 한국태양광발전학회 2013 Current Photovoltaic Research Vol.1 No.2

Heterojunction with Intrinsic Thin-layer (HIT) solar cells are currently an important subject in industrial trends for thinner solar cell wafers due to the low-temperature of production processes, which is around 200°C, and due to their high-efficiency of 24.7%, as reported by the Panasonic (Sanyo) group. The use of thinner wafers and the enhancement of cell performance with fabrication at low temperature have been special interests of the researchers. The fundamental understanding of the band bending structures, choice of materials, fabrication process, and nano-scale characterization methods to provide necessary understanding of the interface passivation mechanisms, emitter properties, and requirements for transparent oxide conductive layers is presented in this review. This information should be used for the performance characterization of the developing technologies for HIT solar cells.

Local Density Encoding for Robust Stereo Matching

Vinh Dinh Nguyen,Duc Dung Nguyen,Sang Jun Lee,Jae Wook Jeon IEEE 2014 IEEE transactions on circuits and systems for vide Vol.24 No.12

<P>Stereo correspondence is challenging under realistic conditions due to uncontrolled factors that affect input images, including illumination inconsistencies and radiometric variations. Many local and global models have been suggested to address these problems; however, their performance is often degraded due to the assumption of color consistency between the left and right images. Therefore, we present a new local pattern, local density encoding, for stereo matching measurements to improve the performance of existing stereo methods. Our experimental results indicate that the proposed method is less sensitive to illumination changes and radiometric variations. Moreover, in the cases with normal and severe illumination changes, the proposed method is more robust than state-of-the-art data costs.</P>

An Optimized Approach for Time-Constrained and Reliable Bursty Data Acquisition in WMSNs

Vinh, Phan Van,Oh, Hoon Taylor & Francis 2015 INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWOR Vol.2015 No.-

MARITIME SECURITY WITHOUT TEARS

Vinh Thai,Shu-Ling Chen,Solomon Chen 인하대학교 정석물류통상연구원 2008 인하대학교 정석물류통상연구원 학술대회 Vol.2008 No.3

In recent years, the issue of maritime security has become a major concern on the international maritime agenda. This, in turns, has sparked off lots of interests in the context of maritime logistics management. One of the issues in this respect is how to enhance security while not jeopardising organisational efficiency and effectiveness, or to manage security effectively, e.g. facilitating the smooth flows of materials while enhancing maritime security at the same time. In addressing this issue, we place three cornerstones for the effective management of security in maritime transport: quality management (QM), risk management (RM), and business continuity management (BCM). A conceptual model of critical success factors of effective security management is devised following this reasoning. It is further analysed and discussed following the analysis of a survey conducted with a sample of shipping companies in Vietnam and followed up by the same survey in Taiwan. Findings from the surveys proved that all proposed 24 critical success factors are valid and should be used as critical factors for success in effectively managing security in maritime transport. Although there are some differences in terms of perceived rankings of factors, Vietnamese and Taiwanese respondents are indifferent in their perceptions of some most important factors, especially relating to incident handling and response, and the role of senior management. The confirmed implication of this research is that effective security management can be achieved by employing critical success factors derived from the fundamental principles of quality, risk and business continuity management.

Photodetector and Pressure Sensor Based on Field-Effect Transistor with the Nanohybrid Channel of ZnO Nanorods and Graphene

Vinh Quang Dang,Tran Quang Trung,Do-Il Kim,Le Thai Duy,Bo-Yeong Kim,Byeong-Ung Hwang,Doo-Won Lee,Nae-Eung Lee 한국진공학회 2015 한국진공학회 학술발표회초록집 Vol.2015 No.2

Data Fusion Technique for Noisy and Multi-fidelity Data Processing in Support of Accurate Flight Simulation

Vinh Pham,MuKyeom Kim(김무겸),Nadhie Juliawan,Maxim Tyan,Jae-Woo Lee(이재우),Sangho Kim(김상호) 한국항공우주학회 2019 한국항공우주학회 학술발표회 논문집 Vol.2019 No.11