The preliminary study in property of oxidation of Polyethylene Glycols

Ran Shen,정태섭(Tae Seop Jeong),신철호(Chul Ho Shin),Long Zhe Cui 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12

This paper summarized the basic principle of the advanced oxidation process (AOP), varying with molecular weight in Polyethylene Glycols solution (MW200~20000), which is focused on the COD removal efficiency and molecular weight distribution (MWD). The experiment studied on the efficiency of O₃/UV/O₃+UV as assessed by COD, molecular weight (MW) distribution which detected by Gel filtration chromatography (TSK-GEL G4000PW 7.5*300 mm). Total oxidation of these compounds to carbon dioxide was proved difficult. On the reduction of COD, O₃ coupled with UV is not as effective as UV or O₃, but it seems more effective breaking the molecular bond, converting the original polymer to lower molecular weight compounds. Additionally, we studied on the oxidation effect to PEG couple the PAC (-200 mesh) with UV/O₃ which shows a COD removal efficiency up to 87.9% in 4 hours.

The characteristic of chemical wastewater degradation by advanced oxidation process

Ran Shen,김명희(Ming Ji Jin),Tae Seop Jeong,Chan Hee Won 대한환경공학회 2006 대한환경공학회 학술발표논문집 Vol.2006 No.12

Evaluation of the anti-Toxoplasma gondii Activity of Hederagenin in vitro and in vivo

Run-Hui Zhang,Runhao Jin,Hao Deng,Qing-Kun Shen,Zhe-Shan Quan,Chun-Mei Jin 대한기생충학열대의학회 2021 The Korean Journal of Parasitology Vol.59 No.3

Toxoplasma gondii infection is widespread worldwide, not only posing a serious threat to human food safety and animal husbandry, but also endangering human health. The selectivity index was employed to measure anti-T. gondii activity. Hederagenin (HE) exhibited potent anti-T. gondii activity and low cytotoxicity. For this reason, HE was selected for in vivo experiments. HE showed 64.8%±13.1% inhibition for peritoneal tachyzoites in mice, higher than spiramycin 56.8%±6.0%. Biochemical parameters such as alanine aminotransferase, aspartate aminotransferase, glutathione, and malondialdehyde, illustrated that HE was a good inhibitor of T. gondii in vivo. This compound was also effective in relieving T. gondii-induced liver damage. Collectively, it was demonstrated that HE had potential as an anti-T. gondii agent.

[P10-48] Antioxidative and ACE inhibitory activity of Kimchi's condiment treated with lactic acid bacteria

Shen Jing,Young Ran Jeong,Hyun Soo Lim,Myeong Rak Choi 한국식품영양과학회 2005 한국식품영양과학회 학술대회발표집 Vol.2005 No.10

A New Furostanol Saponin from Asparagus cochinchinensis

Yang Shen,Hai-Sheng Chen,Cong-Li Xu,Wei-Dong Xuan,Hui-Liang Li,Run-Hui Liu,Xi-Ke Xu 대한약학회 2011 Archives of Pharmacal Research Vol.34 No.10

A new furostanol saponin, (25S)-26-O-β-D-glucopyranosyl-5β-furost-20(22)-en-3β, 15β,26-triol-3-O-[α-L-rhamnopyranosyl-(1-4)]-β-D-glucopyranoside, namely, aspacochioside D (1) were isolated from Asparagus cochinchinensis (Lour.) Merr, along with three known saponins, aspacochioside C (2), (25S)-5β-spirostan-3β-yl-O-[O-α-L-rhamnopyranosyl-(1-4)]-β-D-glucopyranoside (3), and pseudoprotoneodioscin (4). The structure of 1 was elucidated on the basis of chemical reactions and spectral analysis (IR, GC, ESI-MS, ^1H-NMR, ^13C-NMR, DEPT, HMBC, HMQC and NOESY). The antiproliferative effects of 1-4 were evaluated in a cytotoxicity assay against the human tumor cell line, A549. Compound 2 (Aspacochioside C) exhibited moderate cytotoxicity against A-549, with an IC_50 value of 3.87 μg/mL.

Triangulated surface flattening based on the physical shell model

Bing-yin Shen,Yue Yang,Ran Zheng,Xiongbing Li,Minhan Yi 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.5

Triangulated surface flattening plays an important role in the surface shape design of a complex product, such as a vehicle, a train and an air plane. We propose a new method of generating 2D flat patterns from a 3D triangulated surface by the physical shell model to assist in the design of the surface model. The proposed method can be divided into two primary steps: Local and global steps. In the local step, edge based spring stretching and hinge based bending model are constructed and only the local spring stretch element is projected onto the constraint manifold. In the global step, the results of individual projections are combined, and by solving a simplified global matrix, a compromise between all of the individual constraints is obtained, and the global effects are also considered. The result indicates that the proposed method can compute a flattenable mesh surface from complex 3D mesh surfaces successfully and efficiently.

Test on the anchoring components of steel shear keys in precast shear walls

Shao-Dong Shen,Peng Pan,Wen-Feng Li,Qi-Song Miao,Run-Hua Gong 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.6

Prefabricated reinforced-concrete shear walls are used extensively in building structures because they are convenient to construct and environmentally sustainable. To make large walls easier to transport, they are divided into smaller segments and then assembled at the construction site using a variety of connection methods. The present paper proposes a precast shear wall assembled using steel shear keys, wherein the shear keys are fixed on the embedded steel plates of adjacent wall segments by combined plug and fillet welding. The anchoring strength of shear keys is known to affect the mechanical properties of the wall segments. Loading tests were therefore performed to observe the behavior of precast shear wall specimens with different anchoring components for shear keys. The specimen with insufficient strength of anchoring components was found to have reduced stiffness and lateral resistance. Conversely, an extremely high anchoring strength led to a short-column effect at the base of the wall segments and low deformation ability. Finally, for practical engineering purposes, a design approach involving the safety coefficient of anchoring components for steel shear keys is suggested.

Comparison of cecal microbiota composition in hybrid pigs from two separate three-way crosses

Yang, Yuting,Shen, Liyan,Gao, Huan,Ran, Jinming,Li, Xian,Jiang, Hengxin,Li, Xueyan,Cao, Zhenhui,Huang, Ying,Zhao, Sumei,Song, Chunlian,Pan, Hongbin Asian Australasian Association of Animal Productio 2021 Animal Bioscience Vol.34 No.7

Objective: The intestinal microbiota plays an important role in host physiology, metabolism, immunity, and behavior. And host genetics could influence the gut microbiota of hybrid animals. The three-way cross model is commonly utilized in commercial pig production; however, the use of this model to analyse the gut microbial composition is rarely reported. Methods: Two three-way hybrid pigs were selected, with Saba pigs as the starting maternal pig: Duroc× (Berkshire×Saba) (DBS) pig, Berkshire×(Duroc×Saba) (BDS) pig. One hundred pigs of each model were reared from 35 days (d) to 210 d. The body weight or feed consumption of all pigs were recorded and their feed/gain (F/G) ratio was calculated. On day 210, 10 pigs from each three-way cross were selected for slaughter, and cecal chyme samples were collected for 16S rRNA gene sequencing. Results: The final body weight (FBW) and average daily gain (ADG) of DBS pigs were significantly higher than those of BDS pigs (p<0.05), while the F/G ratios of DBS pigs were significantly lower than those of BDS pigs (p<0.05). The dominant phyla in DBS and BDS pigs were Bacteroidetes (55.23% vs 59%, respectively) and Firmicutes (36.65% vs 34.86%, respectively) (p>0.05). At the genus level, the abundance of Prevotella, Roseburia, and Anaerovibrio in DBS pigs was significantly lower than in BDS pigs (p<0.01). The abundance of Eubacterium, Clostridium XI, Bacteroides, Methanomassiliicoccus, and Parabacteroides in DBS pigs was significantly higher than in BDS pigs (p<0.05). The FBWs and ADGs were positively correlated with Bacteroides, ClostridiumXI, and Parabacteroides but negatively correlated with the Prevotella, Prevotella/Bacteroides (P/B) ratio, Roseburia, and Anaerovibrio. Conclusion: These results indicated that host genetics affect the cecal microbiota composition and the porcine gut microbiota is associated with growth performance, thereby suggesting that gut microbiota composition may be a useful biomarker in porcine genetics and breeding.

An Optimal LED Light Source Arrangement to Reduce SNR Fluctuation for MISO VLC System Using Fireworks Algorithm

Chunxia You,Shen Zhang,Ran Zhang 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.12

This paper investigates a novel LED lamp arrangement to reduce SNR fluctuation in indoor visible light communication system. In VLC system, the signal sources often come from several LED lamps. The different positions of the LED lamps will influence the system quality. In our proposed scheme, the LED lamp arrangement consists of N LED lamps spreading in the ceiling. The heights of all lamps are the same of 3 meters which is the height of communication room. An optimal LED arrangement with the firework algorithm is presented for the minimum SNR factor and SNR fluctuation on the light receiver plane no matter the number of lamps. In order to compare the effect of SNR distributions, the total power of N LED lamps is identical. Our studies show that the SNR factor under such a LED arrangement is reduced from 118.5 to 4.09 with 16 LED lamps multi-input system which effectively reduces the SNR fluctuation between different users. Such arrangement guarantees all users obtain almost identical communication quality regardless of users’ locations.

The New Ecosystem of Cross-border E-Commerce among Korea, China and Japan Based on Blockchain

Xiang-Dong Shen,Xi Chen,Ran Ji,Ren-Hong Wu 한국무역학회 2020 Journal of Korea trade Vol.24 No.5

Purpose - The purpose of the study is to propose a theoretical framework of cross-border e-commerce ecosystems based on blockchain technology. The ecosystem includes five systems, namely, crossborder supply chain intelligent system, cross-border logistics system, cross-border payment system, cross-border product quality traceability system and cross-border customs supervision system. Design/methodology - This study firstly derived the main improvement factors for the new ecosystem based on blockchain through prior research and expert interviews on cross-border e-commerce. Then explored the use of virtue of decentralization, anti-counterfeiting traceability, consensus mechanism, smart contract and other means of the core technology of blockchain to overcome the bottleneck of cross-border e-commerce development among Korea, China, and Japan. Finally, proposed valuable implications in both theoretical and practical perspectives. Findings - As a result, we combined with the problems existing in cross-border e-commerce among Korea, China and Japan, this paper proposes a solution based on blockchain. On this basis, it constructs a cross-border e-commerce ecosystem among these three countries, including five systems. In addition, we discuss the main problems existing in the current blockchain, such as low transaction concurrency, security loopholes, and inconsistent standards, the corresponding countermeasures are proposed from the technical level, security level and industry standards. Originality/value - This study is the first to apply the blockchain technology to solve the cross-border e-commerce problems in Korea, China and Japan, which is of pioneering significance in both literature and practice. Block chain technology is in the ascendency. This study provides technical solutions for promoting the development of cross-border e-commerce import and export trade between Korea, China and Japan.