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Assessment of Equivalent Elastic Modulus of Perforated Spherical Plates
collins juma,남궁인 한국압력기기공학회 2019 한국압력기기공학회 논문집 Vol.15 No.1
Perforated plates are used for the steam generator tube-sheet and the Reactor Vessel Closure Head in the Nuclear Power Plant. The ASME code, Section III Appendix A-8000, addresses the analysis of perforated plates, however, this analysis is only limited to the flat plate with a triangular perforation pattern. Based on the concept of the effective elastic constants, simulation of flat and spherical perforated plates and their equivalent solid plates were carried out using Finite Element Analysis (FEA). The isotropic material properties of the perforated plate were replaced with anisotropic material properties of the equivalent solid plate and subjected to the same loading conditions. The generated curves of effective elastic constants vs ligament efficiency for the flat perforated plate were in agreement with the design curve provided by ASME code. With this result, a plate with spherical curvature having perforations can be conveniently analyzed with equivalent elastic modulus and equivalent Poisson’s ratio.
Collins Usunobun Inegbenosun 대한수의학회 2023 Journal of Veterinary Science Vol.24 No.1
Background: Intestinal parasites in livestock cause huge economic setbacks. Moreover, these parasites can threaten human health when also present in companion animals. Objectives: The study examined the prevalence and burden of intestinal parasites among roaming/migrating animals (goats, sheep, cattle, and dogs) to provide insights into the risk of potential human parasitic infections. Methods: A total of 1,741 fecal samples from goats (n = 920), sheep (n = 335), cattle (n = 230) and dogs (n = 256) were obtained randomly across 18 local government areas in Edo State, Nigeria. The parasite samples were recovered and identified under a microscope. Molecular tools were used to identify Toxocara spp. Results: Eighteen different parasites were isolated. Among the different groups of parasites observed, nematodes occurred the most, followed by protozoans. Among nematodes, Haemonchus was most prevalent in goats (28.04%) and sheep (29.85%), while Strongyloides (10.86%) and Bunostomum (8.69%) were relatively high in cattle. Strongyloides (3.9%), hookworm (3.9%), and Toxocara (3.12%) were the predominant parasites in dogs. For protozoan parasites, Eimeria was most common in all 4 animal hosts. Several goats (2.39%) and sheep (2.38%) tested positive for Fasciola spp. Molecular analysis confirmed Toxocara canis in dogs for the first time in Nigeria. Conclusions: The major parasites recovered from these roaming/migrating animals have zoonotic potentials that can threaten human health.
THE MILITARY BALANCE BETWEEN SUPERPOWERS IN THE FAR EAST: A STUDY IN CONSTRAINTS
Collins, John M. The Institute for Far Eastern Studies Kyungnam Uni 1978 ASIAN PERSPECTIVE Vol.2 No.2
The U.S./Soviet military balance in Central Europe is easy to calculate. Threats to U.S and allied interests are credible and clean cut. Soviet armed services and key associates are clearly converting to offensive capabilities that match stated concepts. Capacities for surprise attacks are increasing in that continental cockpit, which is well suited for massed combat power, a Soviet specialty.
( Collins Wakholi ),( Byoungkwan Cho ),( Changyeun Mo ),( Moon S. Kim ) 한국농업기계학회 2015 바이오시스템공학 Vol.40 No.3
Purpose: Fruit and vegetable production is a fast-growing sector in East Africa, and it bears considerable local and international market potential. In an effort to analyze the challenges within this sector and suggest possible solutions, this study reviews the postharvest handling technologies commonly used with fruits and vegetables in East Africa. Methods: During the course of this study, small-scale farmers were identified as the most prominent producers of fruit and vegetable crops in the region. Results: We found that many of these small-scale farmers employed relative simple and inexpensive techniques in handling their limited volumes of produce. Several factors could be addressed to reduce postharvest losses, including weak policies, inferior infrastructure, and poor market strategies. However, the lack of basic knowledge (including demographic, scientific, and economic knowledge) among the stakeholders (e.g., researchers, farmers, governments, nongovernment organizations, and merchants) on how to develop, implement, use, and sustain the recommended handling technologies is probably the most problematic. Conclusions: We recommend that high priority be placed on closing the knowledge gap, which could enhance the efforts of all the stakeholders to address and reduce postharvest losses.
Beef Carcass Yield Estimation Using 3D Reconstruction From Structured Light and Multi-view Geometry
( Collins Wakholi ),( Kyungdo Kwon ),( Changyeun Mo ),( Wang-hee Lee ),( Byoung-kwan Cho ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Reconstruction of 3D models from real objects is gaining popularity in computer vision and graphics nowadays. This is because it has numerous applications in areas such as industrial inspection, autonomous driving, reverse engineering, multimedia. However, 3D reconstruction is complex and often limited by factors such as sensor specifications, computer resources and expertise. While much efforts have been done to refine the reconstruction algorithms, not much has been done to optimize the scanning technologies. Advances in 3D scanning technology have introduced new techniques to obtain depth information from a scene such as multi-view geometry, structured light and laser scanning. Obtaining 3D information using structured light scanning is become popular because of its precision while using multi-view geometry is relatively low cost but still lacks in accuracy. Since all 3D scanning methods have advantages, the pursuit for accurate resultant 3D models at low cost calls for integration of the scanning technologies. This study therefore aims to develop a 3D system using 1) multi-view structured light scanning, MVSLS and 2) multiple view geometry for accurate beef carcass yield estimation. For the MVSLS-based system, a trinocular system (involving two cameras matched to a single projector) was used and a 360-degree scan of the samples was done in intervals of 45 degrees. The multiple view photogrammetry-based 3D scanning system employed two cameras and independent light sources to capture a 360-degree scan of the samples in intervals of 10 degrees. Using multi-view reconstruction algorithms and data from both setups, point clouds were obtained from matched features that were reconstructed into visual 3D models. Evaluation and comparison of the developed models was done based on the accuracy of volume estimation and reproduction of planar surface texture. The 3D model from best method was selected to estimate the volume and subsequently weight and price of the beef carcass. This study serves as a precursor to the development of a real-time beef carcass yield estimation method for industrial use.
The impact of global warming on the tropical Pacific Ocean and El Niño
Collins, Mat,An, Soon-Il,Cai, Wenju,Ganachaud, Alexandre,Guilyardi, Eric,Jin, Fei-Fei,Jochum, Markus,Lengaigne, Matthieu,Power, Scott,Timmermann, Axel,Vecchi, Gabe,Wittenberg, Andrew Springer Science and Business Media LLC 2010 Nature geoscience Vol.3 No.6