수피와 왕겨탄화물의 금속이온 흡착에 관한 연구

Jun, Yang 한국목재공학회 1983 목재공학 Vol.11 No.6

To remove copper and cadmium ions from their aquous solution, oak and pine bark and carbonated rice husk were tested. Results are as follows. 1. Bark and rice husk can be used as effective adsorbants to remove the metal ions from solution. 2. In case of copper ion, carbonated rice husk adsorbed more than bark. On the contrary barks adsorbed more cadmium ions than rice husk. 3. There were no significant difference in adsorption capacity between pine and oak barks.

CONTROL STRATEGIES FOR SHUNT ACTIVE POWER FILTERS IN DISTORTION SOURCE VOLTAGE SITUATION

Jun Yang,Zhaoan Wang 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-

The compensation strategy of shunt active power filters is one of the most important link that determine its compensation characteristics In this paper, a new interpretation of the instantaneous reactive power theory in three-phase circuits was proposed A compensation strategy (l_p, l_q mode) was introduced on the basis of the new interpretation. This compensation strategy was compared with other two compensation strategies (p, q mode and UPF mode). When source voltage is sinusoidal, the three compensation strategies are equivalent to each other When source voltage is distorted, a sinusoidal source current may result only by using l_p, l_q mode This js the advantage of l_p, l_q mode. The result is verified by simulation.

Optimal Cooperative Jamming for Multiuser Broadcast Channel with Multiple Eavesdroppers

Jun Yang,Il-Min Kim,Dong In Kim IEEE 2013 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.12 No.6

<P>Cooperative jamming for multiuser multiple input multiple output (MIMO) broadcast channel is studied to enhance the physical layer security with the help of a friendly jammer. We assume the base station transmits multiple independent data streams to multiple legitimate users. During the transmission, however, there are multiple eavesdroppers with multiple antennas that have interests in the streams from the base station. In order to wiretap the desired streams, the eavesdroppers may collude or not, and maximize the signal-to-interference-plus-noise ratio (SINR) of the desired streams using receive beamforming. The optimal cooperative jammer is designed to keep the achieved SINR at eavesdroppers below a threshold to guarantee that the transmission from the base station to legitimate users is confidential. One main advantage of the proposed cooperative jamming scheme is that no modification is needed for the existing precoding schemes at the base station and decoding schemes at legitimate users. Thus, any existing practical precoding/decoding schemes for multiuser MIMO broadcast channel can be applied directly with the help of a friendly jammer using the proposed cooperative jamming.</P>

Joint Design of Optimal Cooperative Jamming and Power Allocation for Linear Precoding

Jun Yang,Il-Min Kim,Dong In Kim Institute of Electrical and Electronics Engineers 2014 IEEE Transactions on Communications Vol. No.

<P>Linear precoding and cooperative jamming for multiuser broadcast channel is studied to enhance the physical layer security. We consider the system where multiple independent data streams are transmitted from the base station to multiple legitimate users with the help of a friendly jammer. It is assumed that a normalized linear precoding matrix is given at the base station, whereas the power allocated to each user is to be determined. The problem is to jointly design the power allocation across different users for linear precoding and the cooperative jamming at the friendly jammer. The goal is to maximize a lower bound of the secrecy rate, provided that a minimum communication rate to the users is guaranteed. The optimal solution is obtained when the number of antennas at the friendly jammer is no less than the total number of antennas at the users and eavesdropper. Moreover, a suboptimal algorithm is proposed, which can be applied for all the scenarios. Numerical results demonstrate that the proposed schemes are effective for secure communications.</P>

Engineered biomaterials for development of nucleic acid vaccines

Jun Yang,Yan Li,Shubin Jin,Jing Xu,Paul C Wang,Xing-Jie Liang,Xin Zhang 한국생체재료학회 2015 생체재료학회지 Vol.19 No.1

Nucleic acid vaccines have attracted many attentions since they have presented some superiority over traditional vaccines. However, they could only induce moderate immunogenicity. The route and formulation of nucleic acid vaccines have strong effects on the immune response and efficiency. Numerous biomaterials are used as a tool to enhance the immunogenicity of antigens. They deliver the antigens into the cells through particle- and non-particle-mediated pathway. However, challenges remain due to lack of comprehensive understanding of the actions of these biomaterials as a carrier/adjuvant. Herein, this review focuses on the evolution of biomaterials used for nucleic acid vaccines, discusses the advantages and disadvantages for gene delivery and immunostimulation of variety of structures of the biomaterials, in order to provide new thought on rational design of carrier/adjuvant and better understanding of mechanism of action in both immunostimulatory and delivery methods.

(m,N)-delay-partitioning Approach to stability Analysis for T-S Fuzzy systems with Interval Time-varying Delay

Jun Yang,Wenpin Luo,Yong-Hu Wang,Jun Cheng 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.2

This paper is concerned with improved stability criteria for uncertain T-S fuzzy systems with intervaltime-varying delay by means of a new (m;N)-delay-partitioning approach. Based on an appropriate augmented LKFestablished in the framework of state vector augmentation, some tighter bounding inequalities (Seuret-Wirtinger’sintegral inequality, Peng-Park’s integral inequality and the reciprocally convex approach) have been employed todeal with (time-varying) delay-dependent integral items of the derivative of LKF, therefore, less conservative delaydependentstability criteria can be obtained on account of none of any useful time-varying items are arbitrarilyignored. It’s worth mentioning that, when the delay-partitioning number m is fixed, less conservatism can beachieved by increase of another delay-partitioning number N, but without increasing any computing burden. Finally,one numerical example is provided to show that the proposed conditions are less conservative than existing ones.

Delay-dependent Stabilization for Stochastic Delayed Fuzzy Systems with Impulsive Effects

Jun Yang,Shouming Zhong,Wenpin Luo,Guihua Li 제어·로봇·시스템학회 2010 International Journal of Control, Automation, and Vol.8 No.1

This paper investigates the problem of stabilization for a class of stochastic delayed Takagi-Sugeno (T-S) fuzzy systems with impulsive effects. The time delay is assumed to appear both in the state and control input. The purpose is design of a state-feedback fuzzy controller such that the resulting closed-loop system is exponentially stable in the mean square. By means of Lyapunov-Krasovskii functional, the relaxed LMI approach and mathematical analysis technique, delay-dependent sufficient conditions for solvability of this problem are obtained in terms of linear matrix inequalities (LMIs). Finally, a simulation example is given to demonstrate effectiveness and applicability of the theoretical results.

Improved Stability Criteria for T-S fuzzy Systems with Time-varying Delay by Delay-partitioning Approach

Jun Yang,Wenpin Luo,Yong-Hu Wang,Chun-Sheng Duan 제어·로봇·시스템학회 2015 International Journal of Control, Automation, and Vol.13 No.6

This paper focuses on the robust stability criteria of uncertain T-S fuzzy systems with timevarying delay by delay-partitioning approach. An appropriate Lyapunov-Krasovskii functional is established in the framework of state vector augmentation. Then, on the basis of the Finsler’s lemma, some tighter bounding inequalities (Seuret-Wirtinger’s integral inequality and Peng-Park’s integral inequality) are employed to deal with (time-varying) delay-dependent integral items. Therefore, less conservative delay-dependent stability criteria are obtained in terms of linear matrix inequalities (LMIs), which can be solved efficiently with the Matlab LMI toolbox. Finally, two numerical examples are provided to show that the proposed conditions are less conservative than existing ones.

A Water-Soluble Polyimide Precursor

Jun Yang,Myong Hoon Lee 한국고분자학회 2004 Macromolecular Research Vol.12 No.3

Asymptotically Optimal Cooperative Jamming for Physical Layer Security

Jun Yang,Soheil Salari,김일민,김동인,김석기,임광애 한국통신학회 2016 Journal of communications and networks Vol.18 No.1

Design of effective cooperative jamming (CJ) algorithmis studied in this paper to maximize the achievable secrecy ratewhen the total transmit power of the source and multiple trustedterminals is constrained. Recently, the same problem was studiedin [1] and an optimal algorithm was proposed involving aone-dimensional exhaustive searching.However, the computationalcomplexity of such exhaustive searching could be very high, whichmay limit the practical use of the optimal algorithm. We propose anasymptotically optimal algorithm, involving only a fast line searching,which can guarantee to achieve the global optimality whenthe total transmit power goes to infinity. Numerical results demonstratethat the proposed asymptotically optimal algorithm essentiallygives the same performance as the algorithm in [1, (44)] butwith much lower computational complexity.