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Xuejun, Cao,Jianhang, Zhu,Dongzhi, Wei,Hur, Byong Ki 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.3
Partition behavior of cephalexin and 7-ADCA in PEG-salts and EOPO-salts aqueous two-phase systems has been investigated under various different conditions. Effect of polymer molecular weight, salts types, tie line length on partition coefficients of cephalexin and 7-ADCA were described. Additives such as salts, water miscible solvents and surfactants were used to improve partition of cephalexin and 7-ADCA. NaSCN shows greatest influence on partition of cephalexin and 7-ADCA in 20% PEG 400-17.5% (NH_4)_2SO_4. Cephalexin and 7-ADCA partition coefficients reached 12.92 and 2.58, respectively. While NaCI shows greatest influence on partition of cephalexin and 7-ADCA in E0_40PO_60-(NH_4)_2SO_4. In 15% E0_40P0_60-13% (NH_4)_2SO_4 ATPS, partition coefficients of cephalexin and 7-ADCA reached 0.08 and 0.42, respectively. Cephalexin and 7-ADCA shows different partition trend in PEG-(NH_4)_2SO_4 and EOPO-(NH_4)_2SO_4 ATPS. In EOPO-(NH_4)_2SO_4 ATPS, diagrams of PEG3000-(NH_4)_2SO_4, E0_40PO_60-(NH_4)_2SO_4, E0_20PO_80-(NH_4)_2SO_4 were prepared and their differences were analyzed, and recovery of E0_40PO_60-(NH_4)_2SO_4 ATPS was performed with yield of 90-95%.
Valley-dependent electron transport in ferromagnetic/normal/ ferromagnetic silicene junction
Xuejun Qiu,Yanfu Cheng,Zhenzhou Cao,Jiemei Lei 한국물리학회 2015 Current Applied Physics Vol.15 No.6
The electron transport through ferromagnetic/normal/ferromagnetic silicene junction with an induced energy gap is investigated in this work. The energy gap can be tuned by applying electric field or exchange fields due to the buckled structure of silicene. We analyze the local electric field, exchange field, length of normal region-dependence transmission probabilities of four groups and valley conductance. These transmission probabilities and valley conductance can be turned on or off by adjusting the local electric field and exchange field. In particular, a fully valley polarized conductance with 80% transmission is found in this junction, which can be caused by the interplay of valley-dependent massive Dirac electron, the exchange potential and the on-site potential difference of sublattices. Our findings will benefit applications in silicene-based high performance nano-electronics.
The Lightweight Ownership Transfer Protocol using Physically Unclonable Function
Xuejun Zhang,Wanlu Huang,He Xu,Yu Wang 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.2
RFID technology has increasingly used in the various fields of our lives, and in the entire life cycle of the tag, there may be several ownership changes. Therefore, it is very important to protect the security and privacy of customer’s information during transferring. Combining with the physical characteristics of the anti-clone tag and the low-cost requirement, we proposed a lightweight ownership transfer protocol using Physically Unclonable Function (PUF) to achieve a safe ownership transfer. Through using formal analysis, it shows that this protocol can also resist reply attack, desynchronization attack, tampering attack, to protect the old and the new owner’s private information.
ON COMPLETE CONVERGENCE AND COMPLETE MOMENT CONVERGENCE FOR A CLASS OF RANDOM VARIABLES
Xuejun Wang,Yi Wu 대한수학회 2017 대한수학회지 Vol.54 No.3
In this paper, the complete convergence and complete moment convergence for a class of random variables satisfying the Rosenthal type inequality are investigated. The sufficient and necessary conditions for the complete convergence and complete moment convergence are provided. As applications, the Baum-Katz type result and the Marcinkie\-wicz-Zygmund type strong law of large numbers for a class of random variables satisfying the Rosenthal type inequality are established. The results obtained in the paper extend the corresponding ones for some dependent random variables.
MAXIMAL INEQUALITIES AND STRONG LAW OF LARGE NUMBERS FOR AANA SEQUENCES
Xuejun, Wang,Shuhe, Hu,Xiaoqin, Li,Wenzhi, Yang Korean Mathematical Society 2011 대한수학회논문집 Vol.26 No.1
Let {$X_n$, $n{\geq}1$} be a sequence of asymptotically almost negatively associated random variables and $S_n=\sum^n_{i=1}X_i$. In the paper, we get the precise results of H$\acute{a}$jek-R$\acute{e}$nyi type inequalities for the partial sums of asymptotically almost negatively associated sequence, which generalize and improve the results of Theorem 2.4-Theorem 2.6 in Ko et al. ([4]). In addition, the large deviation of $S_n$ for sequence of asymptotically almost negatively associated random variables is studied. At last, the Marcinkiewicz type strong law of large numbers is given.
Strong limit theorems for weighted sums of NOD sequence and exponential inequalities
Xuejun Wang,Shuhe Hu,Andrei I. Volodin 대한수학회 2011 대한수학회보 Vol.48 No.5
Some properties for negatively orthant dependent sequence are discussed. Some strong limit results for the weighted sums are obtained, which generalize the corresponding results for independent sequence and negatively associated sequence. At last, exponential inequalities for negatively orthant dependent sequence are presented.
Four-cable-driven parallel robot
XueJun Jin,Dae Ik Jun,Andreas Pott,Sukho Park,Jong-Oh Park,Seong Young Ko 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper presents design and kinematic analysis for a cable-driven parallel robotic (CDPR) manipulator with four cables, The CDPR manipulator produces a planar motion including two translational and one rotational degrees of freedom. To move the end-effector of CDPR, its kinematic structure is analyzed and the inverse kinematics is formulated in the closed-form solution. The experimental tests using an implemented prototype have shown the feasibility of the system design and its operation.
Research on Urban Traffic Optimal Path Planning Method based on Improved Genetic Algorithm
Xuejun Liu,Yihan Chen 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.10
The traditional genetic algorithm randomly selects nodes in two chromosomes for crossover operation, which may result in individuals of disconnected or loop circuit and lead to issues as meaningless crossover operations. In order to increase the diversity of the population and prevent the occurrence of premature mutation algorithm which might cause local convergence, this essay presents a new urban traffic optimal path planning method. Initialized from the improvement of population genetic algorithm, it designs the fitness function and optimizes crossover and mutation operators so that the optimal or near-optimal solution can be quickly figured out. Moreover, the Matlab software simulation test exhibits the feasibility and effectiveness of the method.
A Framework for measuring query privacy in Location-based Service
( Xuejun Zhang ),( Xiaolin Gui ),( Feng Tian ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.5
The widespread use of location-based services (LBSs), which allows untrusted service provider to collect large number of user request records, leads to serious privacy concerns. In response to these issues, a number of LBS privacy protection mechanisms (LPPMs) have been recently proposed. However, the evaluation of these LPPMs usually disregards the background knowledge that the adversary may possess about users` contextual information, which runs the risk of wrongly evaluating users` query privacy. In this paper, we address these issues by proposing a generic formal quantification framework,which comprehensively contemplate the various elements that influence the query privacy of users and explicitly states the knowledge that an adversary might have in the context of query privacy. Moreover, a way to model the adversary`s attack on query privacy is proposed, which allows us to show the insufficiency of the existing query privacy metrics, e.g., k-anonymity. Thus we propose two new metrics: entropy anonymity and mutual information anonymity. Lastly, we run a set of experiments on datasets generated by network based generator of moving objects proposed by Thomas Brinkhoff. The results show the effectiveness and efficient of our framework to measure the LPPM.
XueJun Jin,Dae Ik Jun,Xuemei Jin,Sukho Park,Jong-Oh Park,Seong Young Ko 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Nowadays robotic technology is widely used in rehabilitation especially in stroke rehabilitation. Comparing conventional robots, cable-driven parallel robots have many advantages such as low moving inertia, high power efficiency, large workspace, low cost, and so forth. On this account, three-degree-of-freedom (3-DOF) cable-driven parallel for upper limb rehabilitation is currently under development. This paper presents motion analysis of upper limb to design a 3-DOF upper limb rehabilitation robot. Main feature of this rehabilitation robot is to provide the relatively large workspace and to be less dangerous in the situation of robot’s malfunction due to reduced moving part. Since our rehabilitation is being designed to have a planar workspace, the motion of upper limb is also analyzed in a plane.