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邱瑞中,崔昌源 韓國外國語大學校 外國學綜合硏究센터 中國硏究所 2004 中國硏究 Vol.34 No.-
A large number of ambassadors of Koryo and Korea left for China from 13th century to the end of 19th century, which are Yuan, Ming and Qing Dynasty in China. Some of them wrote YonHaengRok, which became an important document to study this 700-year history. Foreigners recorded what they saw and heard in China, and some of them were not suprising for Chinese people at that time: some of them were closely guarded as secrets: and some of them were burned down and buried in oblivion because of politics. All of them are the historical documentsthat China needs urgently today. Korea has put out these precious documents in the past 20 years. Therefore it is essential to introduce them to Chinese academic circles. The DongGuk University Publishing House has printed 100 copies, whose content includes the historical events from the end of Song Dynasty to the end of Qing Dynasty in 700 years. This article introduces the historical events from JiaJing to WanLi in Ming Dynasty in 16th century.
Chang-Mook Choi,Dong-Il Kim,Rui Li,Dong-Han Choi 한국항해항만학회 2006 한국항해항만학회지 Vol.30 No.10
In this paper, the EM wave absorbers were designed and fabricated for X-band sensors using Carbon of dielectric material with CPE. The complex relative permittivity of samples is calculated by using measurement results of S-parameter. We simulated the double-layered type EM wave absorber with broad bandwidth using the measured complex relative permittivity by changing the thickness and layer, which was fabricated based on the simulated design. The fabricated EM wave absorber consists of 1 mm first layer sheet facing metal with Carbon composition ratio 70 vol.% and 1.5 mm second layer sheet with Carbon composition ratio 60 vol.%. The measured results showed a good agreement to the simulated ones. It is found that the optimized absorption ability of double-layered type EM wave absorber with thickness of 2.5 mm is higher than 10 dB from 7.8 GHz to 13.3 GHz.
Stabilization Control for Spacecraft-manipulator System After Capturing Tumbling Target
Rui Chang,Qingxuan Jia,Ming Chu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.11
Non-cooperative target capturing is a great challenge for space robots among space tasks, because of the difficulty of target detumbling and base stability maintaining, which increasing the requirements for the control performances of the attitude control systems. In this paper, a contact force model combining an optimized Hertz’s model and the LuGre friction model is established, to estimate the contact force without additional sensors. And a novel control methodology for stabilization control of space robot based on an adaptive backstepping nonsingular fast integral terminal sliding mode control (ABNFITSMC) is developed, which significantly improve the convergence speed and satisfied the requirements of robustness of the complex system after capturing. First, the fully controllable dynamic model of the free-flying (no position control) space robot is established by using the Lagrange method. Then, the contact force between the end effector (gripper) and the target is analyzed by combining modified Hertz model and the LuGre friction model. Finally, a novel nonsingular fast integral terminal sliding mode (NFITSM) surface is proposed, so a finite-time convergence, non-singularity, fast transient response, precise trajectory tracking, robustness with uncertainties and disturbances is achieved. Then, an adaptive control law is used to approximate the upper bound value of the disturbance and uncertainties, and a backstepping control method is employed to guaranty the global asymptotic stability of the control system. The numerical simulation results show that the proposed algorithm can stable the attitude of the space robot in a quick limited time, and reduce the chattering significantly compared to the traditional sliding surface, the results demonstrates the superior performance of the proposed approach., and proves the feasibility of its application in non-cooperative target capturing task.
A Multi-level Perception Security Model Using Virtualization
( Rui Lou ),( Liehui Jiang ),( Rui Chang ),( Yisen Wang ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.11
Virtualization technology has been widely applied in the area of computer security research that provides a new method for system protection. It has been a hotspot in system security research at present. Virtualization technology brings new risk as well as progress to computer operating system (OS). A multi-level perception security model using virtualization is proposed to deal with the problems of over-simplification of risk models, unreliable assumption of secure virtual machine monitor (VMM) and insufficient integration with virtualization technology in security design. Adopting the enhanced isolation mechanism of address space, the security perception units can be protected from risk environment. Based on parallel perceiving by the secure domain possessing with the same privilege level as VMM, a mechanism is established to ensure the security of VMM. In addition, a special pathway is set up to strengthen the ability of information interaction in the light of making reverse use of the method of covert channel. The evaluation results show that the proposed model is able to obtain the valuable risk information of system while ensuring the integrity of security perception units, and it can effectively identify the abnormal state of target system without significantly increasing the extra overhead.
In-situ photoelectron spectroscopy with online activity measurement for catalysis research
Rui Chang,Young Pyo Hong,Stephanus Axnanda,Baohua Mao,Naila Jabeen,Suidong Wang,Renzhong Tai,Zhi Liu 한국물리학회 2012 Current Applied Physics Vol.12 No.5
We report Ambient pressure X-ray Photoelectron Spectroscopy Endstation with an integrated chemical analytical system that consists of a residual gas analyzer in the 2nd differential pumping stage and a new low-reactive sample holder heating assembly. This system has a linear response to the reaction chamber gas pressure. The sample heating assembly also has a low dark reaction rate up to 400 ℃ for H2 and CO oxidation. We expect this chemical analytical system will expand our capabilities in conducting inoperando catalysis research.
Chang-Mook Choi,Dong-Il Kim,Rui Li,Dong-Han Choi 한국항해항만학회 2006 한국항해항만학회지 Vol.30 No.9
In this paper, the EM wave absorbers were designed and fabricated for X- band sensors using Carbon of dielectric material with CPE. The complex relative permittivity of samples is calculated by using measurement results of S-parameter. We simulated the double-layered type EM wave absorber with broad bandwidth using the measured complex relative permittivity by changing the thickness and layer, which was fabricated based on the simulated design The fabricated EM wave absorber consists of 1 mm first layer sheet facing metal with Carbon composition ratio 70 vol.% and 1.5 mm second layer sheet with Carbon composition ratio 60 vol.%. The measured results showed a good agreement to the simulated ones. It is found that the optimized absorption ability of double-layered type EM wave absorber with thickness of 2.5 mm is higher than 10 dB from 7.8 GHz to 13.3 GHz.
Chang Shu,Rui Yang,Likun Yin,Xizhen Ai,Shaohui Wang,Wenchao Zhao 한국원예학회 2016 Horticulture, Environment, and Biotechnology Vol.57 No.4
To promote the stress resilience of sweet pepper crops (Capsicum annuum L.) and phase out the use of pesticides and other environmentally harmful materials, grafting has been used to integrate biotic or abiotic stress-resistance characteristics with sustainable crop production. This study aimed to determine the changes in the morphological characteristics, physiological features and low-temperature resistance of the sweet pepper cultivar ‘Hongxing No. 2’ grafted onto five rootstocks (‘No. 14’, ‘No. 15’, ‘No. 16’, ‘Jiaozhen108’, and ‘J4-908’) and itself. The morphological features of the aerial organs and roots of the different graft combinations were monitored, as were the activities of active oxygen-scavenging enzymes. Most morphological and physiological characteristics were significantly improved in the graft combination No. 2/Jiaozhen108, which indicated that Jiaozhen108 had a higher graft affinity with Hongxing No. 2 than the other rootstocks. No. 2/Jiaozhen108 also had a higher resistance to low temperatures. Therefore, the Jiaozhen108 rootstock is considered a quality candidate for grafting with the sweet pepper cultivar Hongxing No. 2, providing a theoretical basis for the screening and greenhouse production of low-temperature resistant stocks.
Choi, Chang-Mook,Kim, Dong-Il,Li, Rui,Choi, Dong-Han Korean Institute of Navigation and Port Research 2006 한국항해항만학회지 Vol.30 No.9
In this paper, the EM wave absorbers were designed and fabricated for X -band sensors using Carbon of dielectric material with CPE. The complex relative permittivity of samples is calculated by using measurement results of S-parameter. We simulated the double-layered type EM wave absorber with broad bandwidth using the measured complex relative permittivity by changing the thickness and layer, which was fabricated based on the simulated design The fabricated EM wave absorber consists of 1 mm first layer sheet facing metal with Carbon composition ratio 70 vol. % and 1.5 mm second layer sheet with Carbon composition ratio 60 vol. %. The measured results showed a good agreement to the simulated ones. It is found toot the optimized absorption ability of double-layered type EM wave absorber with thickness of 2.5 mm is higher than 10 dB from 7.8 GHz to 13.3 GHz.