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AN ANALYSIS AND RESEARCH OF ROUTING PROTOCOL FOR MANET
Lejun Chi,Zhongxiao Hao,Chunlong Yao,Yating Zhang,Kun Wang,Yang Liu 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
In typical methods for accessing Internet or intranet in mobile wireless environment, users can access to fixed networks without multi-relay based on Broad Band access networks. Especially in some special applications, messages from source users can only arrive at destination terminals by multi-relay among several mobile users because wireless network is infrastructural, which is so called Ad hoc networks. There are many up-to-date research results in table driven routing and on-demand routing for ad hoc mobile networks are proposed in this paper. In the mentioned two kinds of routing protocols, DSR and DSDV, this paper not only introduces the contents of the routing protocol, but also points out their advantages and drawbacks, and evaluates these protocols based on a given set of parameters such as deliverance, end-to-end-delay, meanhop and load. This paper also evaluates some drawbacks of above routing protocols. Finally, the authors suggest the research direction in routing for ad hoc mobile wireless networks in the future
Sui Wanmei,Luan Shijun,Song Ranran,Wang Chunlong 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Abnormal grain growth in the traditional sintering process of (SrxBax−1)Nb2O6 limites its application and the localized liquidphase exsisting is regarded the main reason for the presence of abnormal grain growth. To prevent the presence of a localized liquid-phase, the sol-gel method was employed to synthesize nano-sized powders of Sr0.5Ba0.5Nb2O6, which was followed by a pure solid-phase sintering process of nano-sized powders to observe the evolution of the grain morphology. SEM observation revealed that the abnormal and preferential rod-like grain growth along the c-axis existed in the pure state-phase sintering for the Sr0.5Ba0.5Nb2O6 material companied with some of the smaller grains being diminished or consumed. This behavior would exist in the traditional solid-phase sintering with or without the localized liquid-phase. This would be another important factor to aid the abnormal grain growth and should be prevented in the manufacturing process. The effects of grain sizes on the dielectric constant, Tc and diffuse phase transion (DPT) were observed in the Sr0.5Ba0.5Nb2O6 ceramics.
Yue Weiming,Zhang Shengxue,Li Chunlong,Jiang Tiancai,Liu Lubei,Wang Ruoxu,Huang Yulu,Tan Teng,Guo Hao,Zaplatin Evgeny,Xiong Pingran,Wu Andong,Wang Fengfeng,Zhang Shenghu,Huang Shichun,He Yuan,Yao Zeen 한국원자력학회 2020 Nuclear Engineering and Technology Vol.52 No.8
As a part of R&D work for the high intensity proton linac of China Accelerator Driven Sub-critical System project, a superconducting half-wave cavity with a frequency of 162.5 MHz and an optimal beta of 0.15 (HWR015) has been developed at Institute of Modern Physics (IMP), Chinese Academy of Sciences. In this paper, the design and test results will be described in detail. We introduced a new stiffening strategy for the HWR cavity, the simulation results show that the cavity has much lower frequency sensitivity coefficient (df/dp), Lorentz force detuning coefficient (KL), and can achieve more stable mechanical properties. The performance of the HWR cavity operated in cryostat will be also reported.
Bin Dong,Yanjun Lin,Jun Wang,Wen Du,Chunlong Sun,Tao Wu,Shijun Fu 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.5
Pork and its products are preferably contaminated by bacteria; thus, it is essential to develop low-cost, high-efficiency and biologically safe preservatives to prevent the growth of bacteria during storage. In the current study, grass carp β-defensin 1 (gcDefb1) was produced and purified from Pichia pastoris through the heterologous expression method. The in vitro antimicrobial assay demonstrated that yeast-derived gcDefb1 possesses a broad antibacterial spectrum, including both Gram-positive and -negative bacteria, and the MIC values against Escherichia coli ATCC 25,922 were as low as 30 μg/mL and showed no cytotoxicity or hemolytic activity. The bactericidal rate of gcDefb1 was less than 60 min by disrupting the cell membranes, and it inhibited the formation of bacterial biofilms. Moreover, gcDefb1 was used as a biopreservative for pork storage, indicating that the physicochemical and sensory qualities were improved. This study provides an efficient method to prepare and utilize gcDefb1 as a novel biopreservative.
Bin Dong,Yanjun Lin,Zhiwei Su,Chunlong Sun,Jun Wang,Shijun Fu,Wen Du,Tao Wu 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.7
Foodborne pathogens causing food poisoning and infections are detrimental to human health, and the abuse of antibiotics induced severe antibiotic resistance in past decades. Thus, it is urgent to develop new antimicrobial agents. In the current study, human β-defensin 130 (hBD130), which is an antimicrobial peptide identified in human macrophages in 2017, was initially produced in Pichia pastoris. The purified hBD130 demonstrated broad bactericidal spectrum against foodborne pathogens through a membrane disruption, with concentrations ranging from 10 to 45 μg/mL. Moreover, hBD130 showed a low hemolytic effect and nearly no cytotoxicity to mammalian cells with a dosage of 400 μg/mL. In addition, the secretion amounts and mRNA levels of NO, IL-6, IL-1β, and TNF-α in LPS-induced mouse macrophage were significantly decreased with 1 mg/mL of hBD130. Taken together, these results showed that hBD130 is a promising antimicrobial agent to treat foodborne bacterial infections and inflammation.
Dong Bin,Zhou Guowen,Lin Yanjun,Yu Cailing,Wang Jun,Sun Chunlong,Wu Tao 한국응용생명화학회 2021 Applied Biological Chemistry (Appl Biol Chem) Vol.64 No.5
Lactolisterin BU is a novel bacteriocin identified from Lactococcus lactis in 2017. It exhibits antimicrobial activity against food spoilage and foodborne pathogens. In this study, Lactolisterin BU was expressed in Pichia pastoris (P. pastoris) and isolated from the supernatant of yeast culture for the first time. It was found to exhibit a broad antimicrobial spectrum and rapid bactericidal activity against foodborne bacterial pathogens, both gram-positive and gramnegative ones, with minimum inhibition concentrations ranging within 10–60 μg/mL. The recombinant Lactolisterin BU (rLactolisterin BU) also had an antioxidant effect and was resistant to heating, acid–base, and high-dose-saline treatments and barely had any hemolytic activity or cytotoxicity. Moreover, rLactolisterin BU effectively suppressed the growth of bacterial pathogens; suppressed the increases in pH, total volatile basic nitrogen (TVB-N), and thiobarbituric acid reactive substances (TBARS) of pork samples; and maintained a high quality of fresh pork during storage at 4 ℃. Furthermore, rLactolisterin BU effectively inhibited the growth of three kinds of bacteria in a pork-spoilage model. Taken together, rLactolisterin BU could be a promising preservative for food storage.
Low beta superconducting cavity system design for HIAF iLinac
Mengxin Xu,Yuan He,Shengxue Zhang,Lubei Liu,Tiancai Jiang,Zehua Liang,Tong Liu,Yue Tao,Chunlong Li,Qitong Huang,Fengfeng Wang,Hao Guo,Feng Bai,Xianbo Xu,Shichun Huang,Xiaoli Li,Zhijun Wang,Shenghu Zha Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
A superconducting ion-Linac (iLinac), which is supposed to work as the injector in the High Intensity heavy-ion Accelerator Facility project, is under development at the Institute of Modern Physics (IMP), Chinese Academy of Sciences. The iLinac is a superconducting heavy ion linear accelerator approximately 100 meters long and contains 96 superconducting cavities in two types of 17 cyromodules. Two types of superconducting resonators (quarter-wave resonators with a frequency of 81.25 MHz and an optimal beta β = v/c = 0.07 called QWR007 and half-wave resonators with a frequency of 162.5 MHz and an optimal beta β = 0.15 called HWR015) have been investigated. The cavity design included extensive multi-parameter electromagnetic simulations and mechanical analysis, and its results are described in details. The fundamental power coupler and cavity dynamic tuner designs are also presented in this article. The prototypes are under manufacturing and expected to be ready in 2023.