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Zhao, Yan,Kim, Sung Woo Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.5
Objective: Two experiments were conducted using 28 healthy multiparous sows to evaluate the oxidative stress status and reproductive performance of sows during gestation and lactation under different thermal environments. Methods: Fourteen multiparous sows were used in Exp. 1 under a high thermal environment, and the other 14 multiparous sows were used in Exp. 2 under a moderate thermal environment. In both experiments, reproductive performances of sows were recorded. Plasma samples were collected on d 35, 60, 90, and 109 of gestation, and d 1 and 18 of lactation for malondialdehyde, protein carbonyls, 8-hydroxy-deoxyguanosine, immunoglobulin g (IgG), and IgM analysis. Results: For sows in Exp. 1, plasma malondialdehyde concentration on d 109 of gestation tended to be greater (p<0.05) than it on d 18 of lactation. Plasma concentration of protein carbonyl on d 109 of gestation was the greatest (p<0.05) compared with all the other days. Plasma concentrations of 8-hydroxy-deoxyguanosine on d 109 of gestation was greater (p<0.05) than d 18 of lactation in Exp. 1. For sows in Exp. 2, there was no difference of malondialdehyde and protein carbonyl concentration during gestation and lactation. In both Exp. 1 and 2, litter size and litter weight were found to be negatively correlated with oxidative stress indicators. Conclusion: Sows under a high thermal environment had increased oxidative stress during late gestation indicating that increased oxidative damage to lipid, protein, and DNA could be one of the contributing factors for reduced reproductive performance of sows in this environment. This study indicates the importance of providing a moderate thermal environment to gestating and lactating sows to minimize the increase of oxidative stress during late gestation which can impair reproductive outcomes.
Constructing foldable cylindrical surfaces via unfolded waterbomb origami units
Zhao Yan,Wei Yinglei,Jia Yiyang,Li Shiling,Zhang Mingyue,Zeng Lanling,Yang Yang,Mitani Jun 한국CDE학회 2022 Journal of computational design and engineering Vol.9 No.4
Origami tessellations have shown the potential to be utilized for approximating curved target surfaces by folding a set of elemental units. As those units are in partially folded states, the origami approximation captures the outline of the target while demonstrating a corrugated surface. In this paper, we focus on the cylindrical surface and propose a method for constructing its discrete version via square or rectangular units with crease patterns inspired by the waterbomb tessellation. We unify the unit size through optimization to realize cost-efficient constructions. Three-dimensional curved structures are deployed by folding collinear creases between adjacent rows of units and the other creases in each row are remained unfolded. The deployed structure can still be folded to a compact state by folding all creases. To flexibly approximate the outline of the target surface, we analyse relationships between the width and height of the rectangular unit and utilize variations of the waterbomb tessellation to control the region of the origami structure when fully folded. The proposed method provides a novel solution to the so-called inverse-origami-design problem for generating foldable cylindrical surfaces using unfolded waterbomb origami units.
Large eddy simulation of flow around a stay cable with an artificial upper rivulet
Zhao, Yan,Du, Xiaoqing,Gu, Ming,Yang, Xiao,Li, Junjun,He, Ping Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.4
The appearance of a rivulet at the upper surface of a stay cable is responsible for rain-wind-induced vibration (RWIV) of cables of cable-stayed bridges. However, the formation mechanism of the upper rivulet and its aerodynamic effects on the stay cable has not been fully understood. Large eddy simulation (LES) method is used to investigate flow around and aerodynamics of a circular cylinder with an upper rivulet at a Reynolds number of 140,000. Results show that the mean lift coefficients of the circular cylinder experience three distinct stages, zero-lift stage, positive-lift stage and negative-lift stage as the rivulet located at various positions. Both pressure-induced and friction-induced aerodynamic forces on the upper rivulet are helpful for its appearance on the upside of the stay cable. The friction-induced aerodynamic forces, which have not been considered in the previous theoretical models, may not be neglected in modeling the RWIV. In positive-lift stage, the shear layer separated from the upper rivulet can reattach on the surface of the cylinder and form separation bubbles, which result in a high non-zero mean lift of the cylinder and potentially induces the occurrence of RWIV. The separation bubbles are intrinsically unsteady flow phenomena. A serial of small eddies first appears in the laminar shear layer separated from the upper rivulet, which then coalesces and reattaches on the side surface of the cylinder and eventually sheds into the wake.
Complex Systems Smart Home Security Studies based Big Data Analytics
Zhao Yan 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.6
Intelligent home system, due to smart appliances and home access points, communication method used copy, and its electric load and the impact brought about by economic considerations, it makes the intelligent home control and power delivery system has become very complex, complicated accord characteristics of the network; this complex network, its security and Lupin performance becomes extremely important; simply consider the performance of the network topology and other network anomalies can only be expected short-term, however, a large area of network failure systemic, primarily business-related, for this problem, according to the data herein smart home business, a new web-based method of stabilizing the complex network theory.
Research on Mobile Cloud Computing Services for Electric Vehicle Charging Facilities
Zhao Yan 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.7
With the development of Internet of things, especially the development of mobile Internet, electric vehicle charging device and location data and power allocation can reach the cloud through mobile Internet, providing reliable basis for public decision-making and public services. However, the provided real-time performance and cost is the key problem of the implementation of the vehicle area network cloud computing. In this paper, aiming at this problem, proposing the mobile Internet scheduling and transmission strategy based on cloud computing, the simulation results show the effectiveness of the proposed method.