Pathogen-induced MdWRKY1 in ‘Qinguan’ Apple Enhances Disease Resistance

Hongke Fan,Fei Wang,Hua Gao,Leicun Wang,Jihua Xu,Zhengyang Zhao 한국식물학회 2011 Journal of Plant Biology Vol.54 No.3

The WRKY transcription factors have important functions in plant-defense signalling networks. We isolated MdWRKY1 from the Chinese ‘Qinguan’ apple, which is resistant to Alternaria blotch or leaf spot. The MdWRKY1protein was targeted to the nucleus and activated the expression of a reporter gene, consistent with the functioning of a transcription factor. When plants were infected with the pathogen Alternaria alternata f. sp. mali, MdWRKY1 was induced dramatically. Similarly, treatment with hormones SA and MeJA increased transcription significantly. Overexpression in tobacco also enhanced resistance to Phytophthora parasitica var. nicotianae Tucker. These results suggest that MdWRKY1 is a positive regulator of the defense response in higher plants.

Particle deposition behaviors of monolithic De-NOx catalysts for selective catalytic reduction (SCR)

Hongke Feng,Chunhua Wang,Ying Huang 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11

A major issue when using selective catalytic reduction (SCR) De-NOx catalysts is the risk of physical deactivation due to particle deposition and plugging of the monolithic catalysts. In the present study, numerical computations were carried out to investigate the particle deposition behaviors in monolithic SCR catalysts. Based on the calculation results, the effects of particle diameter, particle density, gas velocity, turbulent intensity, chemical reaction and channel size on particle deposition were analyzed in detail. Increasing gas velocity and equivalent diameter of channel can mitigate particle deposition. The increases of turbulent intensity and channel length both lead to the rise of particle deposition ratio. For particles with high Stokes number, particle deposition mainly takes place in the inlet section of catalysts. For particles with low Stokes number, sediment can be observed in the middle and outlet sections of catalysts. De-NOx chemical reaction can mitigate particle deposition, but the effect of chemical reaction on particle deposition is inactive.

SybilBF: Defending against Sybil Attacks via Bloom Filters

Hengkui Wu,Dong Yang,Hongke Zhang 한국전자통신연구원 2011 ETRI Journal Vol.33 No.5

Distributed systems particularly suffer from Sybil attacks, where a malicious user creates numerous bogus nodes to influence the functions of the system. In this letter, we propose a Bloom filter-based scheme, SybilBF, to fight against Sybil attacks. A Bloom filter presents a set of Sybil nodes according to historical behavior, which can be disseminated to at least n∙(e–1)/e honest nodes. Our evaluation shows that SybilBF outperforms state of the art mechanisms improving SybilLimit by a factor of (1/e)gamma at least.

A Default Discrimination Method for Manufacturing Companies by Improved PSO-based LS-SVM

Weiwei Wang,Jie Cao,Hongke Lu,Jian Wang 보안공학연구지원센터 2013 International Journal of Hybrid Information Techno Vol.6 No.2

Multi-constrained Shortest Disjoint Paths for Reliable QoS Routing

Ke Xiong,Zheng-ding Qiu,Yuchun Guo,Hongke Zhang 한국전자통신연구원 2009 ETRI Journal Vol.31 No.5

Finding link-disjoint or node-disjoint paths under multiple constraints is an effective way to improve network QoS ability, reliability, and so on. However, existing algorithms for such scheme cannot ensure a feasible solution for arbitrary networks. We propose design principles of an algorithm to fill this gap, which we arrive at by analyzing the properties of optimal solutions for the multi-constrained link-disjoint path pair problem. Based on this, we propose the link-disjoint optimal multi-constrained paths algorithm (LIDOMPA), to find the shortest link-disjoint path pair for any network. Three concepts, namely, the candidate optimal solution, the contractive constraint vector, and structure-aware non-dominance, are introduced to reduce its search space without loss of exactness. Extensive simulations show that LIDOMPA outperforms existing schemes and achieves acceptable complexity. Moreover, LIDOMPA is extended to the node-disjoint optimal multi-constrained paths algorithm (NODOMPA) for the multi-constrained node-disjoint path pair problem.

Cache-Filter: A Cache Permission Policy for Information-Centric Networking

( Bohao Feng ),( Huachun Zhou ),( Mingchuan Zhang ),( Hongke Zhang ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.12

Information Centric Networking (ICN) has recently attracted great attention. It names the content decoupling from the location and introduces network caching, making the content to be cached anywhere within the network. The benefits of such design are obvious, however, many challenges still need to be solved. Among them, the local caching policy is widely discussed and it can be further divided into two parts, namely the cache permission policy and the cache replacement policy. The former is used to decide whether an incoming content should be cached while the latter is used to evict a cached content if required. The Internet is a user-oriented network and popular contents always have much more requests than unpopular ones. Caching such popular contents closer to the user`s location can improve the network performance, and consequently, the local caching policy is required to identify popular contents. However, considering the line speed requirement of ICN routers, the local caching policy whose complexity is larger than O(1) cannot be applied. In terms of the replacement policy, Least Recently Used (LRU) is selected as the default one for ICN because of its low complexity, although its ability to identify the popular content is poor. Hence, the identification of popular contents should be completed by the cache permission policy. In this paper, a cache permission policy called Cache-Filter, whose complexity is O(1), is proposed, aiming to store popular contents closer to users. Cache-Filter takes the content popularity into account and achieves the goal through the collaboration of on-path nodes. Extensive simulations are conducted to evaluate the performance of Cache-Filter. Leave Copy Down (LCD), Move Copy Down (MCD), Betw, ProbCache, ProbCache⁺, Prob(p) and Probabilistic Caching with Secondary List (PCSL) are also implemented for comparison. The results show that Cache-Filter performs well. For example, in terms of the distance to access to contents, compared with Leave Copy Everywhere (LCE) used by Named Data Networking (NDN) as the permission policy, Cache-Filter saves over 17% number of hops.

A study of predicting irradiation-induced transition temperature shift for RPV steels with XGBoost modeling

Xu, Chaoliang,Liu, Xiangbing,Wang, Hongke,Li, Yuanfei,Jia, Wenqing,Qian, Wangjie,Quan, Qiwei,Zhang, Huajian,Xue, Fei Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8

The prediction of irradiation-induced transition temperature shift for RPV steels is an important method for long term operation of nuclear power plant. Based on the irradiation embrittlement data, an irradiation-induced transition temperature shift prediction model is developed with machine learning method XGBoost. Then the residual, standard deviation and predicted value vs. measured value analysis are conducted to analyze the accuracy of this model. At last, Cu content threshold and saturation values analysis, temperature dependence, Ni/Cu dependence and flux effect are given to verify the reliability. Those results show that the prediction model developed with XGBoost has high accuracy for predicting the irradiation embrittlement trend of RPV steel. The prediction results are consistent with the current understanding of RPV embrittlement mechanism.

A Novel Bio-inspired Trusted Routing Protocol for Mobile Wireless Sensor Networks

( Mingchuan Zhang ),( Changqiao Xu ),( Jianfeng Guan ),( Ruijuan Zheng ),( Qingtao Wu ),( Hongke Zhang ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.1

Routing in mobile wireless sensor networks (MWSNs) is an extremely challenging issue due to the features of MWSNs. In this paper, we present a novel bio-inspired trusted routing protocol (B-iTRP) based on artificial immune system (AIS), ant colony optimization (ACO) and Physarum optimization (PO). For trust mechanism, B-iTRP monitors neighbors` behavior in real time and then assesses neighbors` trusts based on AIS. For routing strategy, each node proactively finds routes to the Sink based on ACO. When a backward ant is on the way to return source, it senses the energy residual and trust value of each node on the discovered route, and calculates the link trust and link energy of the route. Moreover, B-iTRP also assesses the availability of route based on PO to maintain the route table. Simulation results show how B-iTRP can achieve the effective performance compared to existing state-of-the-art algorithms.

Stability Analysis of Grid-connected Inverter System Containing Virtual Synchronous Generator under Time Delay and Parameter Uncertainty

Le Jian,Zhao Liangang,Liao Xiaobing,Zhou Qian,Liang Hongke 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4

Virtual synchronous generator (VSG) control is an eff ective way to increase the equivalent inertia of grid connected inverter system and improve the stability of the power grid. However, the infl uence of this control on the stability of the whole system with time delay and parameter uncertainty should be researched further. In this paper, the state space model of the whole grid connected inverter system adopting VSG under control time-delay and parameter uncertainty is established. The Lyapunov functional with time-delay is constructed by employing time-delay dependent free weight matrix transformation. Furthermore, Lyapunov stability theorem is used to obtain the more conservative time-delay stability conditions with and without parameter uncertainty, linear matrix inequality is used to calculate the time-delay stability margin of the system under uncertainty, and the infl uence of the parameters of VSG control on the delay stability margin is analyzed. The validity of the proposed stability analysis and stability margin solution method are verifi ed by simulation examples.

The Optimal Current Account in the Presence of Capital Control and Excessiveness of Capital Inflows

Hongkee Kim 서울대학교 경제연구소 2002 Seoul journal of economics Vol.15 No.4

This paper investigates whether the current account and capital flows are excessive or not, prior to the financial crisis in East Asian five countries, using the intertemporal model. The optimal current account series are calculated on the basis of intertemporal approach both under perfect capital mobility and under capital controls, against which actual current account and capital flows are compared and judged. The empirical results show that actual current accounts move closely in line with the optimal current account under perfect capital mobility in Korea, Malaysia, the Philippines and Thailand. In the case of Indonesia, actual current accounts are similar to the restricted optimal current accounts in the presence of capital controls. The analytical results show that capital inflows in Malaysia, Thailand and Indonesia seem to be too much in the sense that they are much larger than optimal level of capital flows prior to financial crisis. But actual capital flows move in the same way both in level and in direction as the optimal capital flows in Korea.