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( Xiaoxue Liu ),( Yanping Li ),( Juan Qu ),( Yong Ding ) 한국인터넷정보학회 2017 KSII Transactions on Internet and Information Syst Vol.11 No.2
Telecare Medical Information System (TMIS) helps the patients to gain the health monitoring information at home and access medical services over the mobile Internet. In 2015, Das et al proposed a secure and robust user AKA scheme for hierarchical multi-medical server environment in TMIS, referred to as DAKA protocol, and claimed that their protocol is against all possible attacks. In this paper, we first analyze and show DAKA protocol is vulnerable to internal attacks, impersonation attacks and stolen smart card attack. Furthermore, DAKA protocol also cannot provide confidentiality. We then propose a lightweight pseudonym AKA protocol for multi-medical server architecture in TMIS (short for PAKA). Our PAKA protocol not only keeps good security features declared by DAKA protocol, but also truly provides patient`s anonymity by using pseudonym to protect sensitive information from illegal interception. Besides, our PAKA protocol can realize authentication and key agreement with energy-saving, extremely low computation cost, communication cost and fewer storage resources in smart card, medical servers and physical servers. What`s more, the PAKA protocol is proved secure against known possible attacks by using Burrows-Abadi-Needham (BAN) logic. As a result, these features make PAKA protocol is very suitable for computation-limited mobile device.
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Partial discharge detection of insulated conductors based on CNN-LSTM of attention mechanisms
Li, Zhongzhi,Qu, Na,Li, Xiaoxue,Zuo, Jiankai,Yin, Yanzhen The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.7
Under the condition of a strong electric field, partial discharge often occurs when insulated wire is damaged. The recognition of partial discharge is an effective method for the fast and accurate detection of high voltage insulated wire faults. This paper proposes a PD recognition algorithm based on a convolutional neural network and long short-term memory (LSTM). In addition, attention mechanisms are introduced to give separate weights to LSTM hidden states through a mapping, weighting, and learning parameter matrix. This is done to reduce the loss of historical information and to strengthen the influence of important information. The complex relationship between the voltage signal change and the grid operation state response has been established. The proposed method is verified by the ENET data set published by VSB University. The recognition accuracy is 95.16% for no-PD and 94.44% for PD. Results from the proposed algorithm show that this method has a higher detection accuracy.
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Effects of Fengycin from Bacillus subtilis fmbJ on Apoptosis and Necrosis in Rhizopus stolonifer
Qunyong Tang,Xiaomei Bie,Zhaoxin Lu,Fengxia Lv,Yang Tao,Xiaoxu Qu 한국미생물학회 2014 The journal of microbiology Vol.52 No.8
The lipopeptide antibiotic fengycin, produced by Bacillussubtilis, strongly inhibits growth of filamentous fungi. Inthis study, we evaluated the effects of fengycin treatment onapoptosis and necrosis in Rhizopus stolonifer by means ofcell staining and epifluorescence microscopy. At fengycinconcentrations less than 50 μg/ml, treated fungal cells demonstrateda dose-dependent increase in apoptosis-associatedmarkers compared with the untreated control. These markersincluded chromatin condensation, reactive oxygen speciesaccumulation, mitochondrial membrane potential depolarization,phosphatidylserine externalization, and the occurrenceof DNA strand breaks. These results showed that fungalcells were impaired in a number of important functionsand entered apoptosis upon treatment with low concentrationsof fengycin. In contrast, high concentrations (>50 μg/ml)induced necrosis, indicating that the fungicidal action offengycin operates via two modes: apoptosis at low concentrationsand necrosis at high concentrations. Additionally,the apoptotic effect that we have shown suggests that lowerconcentrations of fengycin than previously thought may beeffective for food preservation.
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