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( Xuelei Gou ),( Libo Zhang ),( Shiwei Zhao ),( Wanping Ma ),( Zibiao Yang ) 한국미생물생명공학회(구 한국산업미생물학회) 2021 Journal of microbiology and biotechnology Vol.31 No.6
To improve the bile salt and acid tolerance of probiotics against gastrointestinal stresses, we investigated the effects of soybean lecithin and whey protein concentrate (WPC) 80 on the bile salt tolerance of Lacticaseibacillus paracasei L9 using a single-factor methodology, which was optimized using response surface methodology (RSM). The survival rate of L. paracasei L9 treated with 0.3% (w/v) bile salt for 2.5 h, and combined with soybean lecithin or WPC 80, was lower than 1%. After optimization, the survival rate of L. paracasei L9 incubated in 0.3% bile salt for 2.5 h reached 52.5% at a ratio of 0.74% soybean lecithin and 2.54% WPC 80. Moreover, this optimized method improved the survival rate of L. paracasei L9 in low pH condition and can be applied to other lactic acid bacteria (LAB) strains. Conclusively, the combination of soybean lecithin and WPC 80 significantly improved the bile salt and acid tolerance of LAB. Our study provides a novel approach for enhancing the gastrointestinal tolerance of LAB by combining food-derived components that have different properties.
A New Distributed Log Anomaly Detection Method based on Message Middleware and ATT-GRU
Wei Fang,Xuelei Jia,Wen Zhang,Victor S. Sheng 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.2
Logs play an important role in mastering the health of the system, experienced operation and maintenance engineer can judge which part of the system has a problem by checking the logs. In recent years, many system architectures have changed from single application to distributed application, which leads to a very huge number of logs in the system and manually check the logs to find system errors impractically. To solve the above problems, we propose a method based on Message Middleware and ATT-GRU (Attention Gate Recurrent Unit) to detect the logs anomaly of distributed systems. The works of this paper mainly include two aspects: (1) We design a high-performance distributed logs collection architecture to complete the logs collection of the distributed system. (2)We improve the existing GRU by introducing the attention mechanism to weight the key parts of the logs sequence, which can improve the training efficiency and recognition accuracy of the model to a certain extent. The results of experiments show that our method has better superiority and reliability.
Life Prediction of Hydraulic Concrete Based on Grey Residual Markov Model
Li Gong,Xuelei Gong,Ying Liang,Bingzong Zhang,Yiqun Yang 한국정보처리학회 2022 Journal of information processing systems Vol.18 No.4
Hydraulic concrete buildings in the northwest of China are often subject to the combined effects of lowtemperaturefrost damage, during drying and wetting cycles, and salt erosion, so the study of concretedeterioration prediction is of major importance. The prediction model of the relative dynamic elastic modulus(RDEM) of four different kinds of modified concrete under the special environment in the northwest of Chinawas established using Grey residual Markov theory. Based on the available test data, modified values of thedynamic elastic modulus were obtained based on the Grey GM(1,1) model and the residual GM(1,1) model,combined with the Markov sign correction, and the dynamic elastic modulus of concrete was predicted. Thecomputational analysis showed that the maximum relative error of the corrected dynamic elastic modulus wassignificantly reduced, from 1.599% to 0.270% for the BS2 group. The analysis error showed that the modelwas more adjusted to the concrete mixed with fly ash and mineral powder, and its calculation error wassignificantly lower than that of the rest of the groups. The analysis of the data for each group proved that themodel could predict the loss of dynamic elastic modulus of the deterioration of the concrete effectively, as wellas the number of cycles when the concrete reached the damaged state.
Junli Gao,Haibing Zhang,Xuelei Xie,Yapo Zhang 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
In response to the environmental problems caused by the difficulty of direct degradation of the raw materials usedin traditional geogrids and the impact of different temperatures on the mechanical properties of geogrids in practicalengineering applications, based on 3D printing technology, polylactic acid (PLA), carbon fiber reinforced polylactic acid(PLA/CF), and thermoplastic polyurethane (TPU) geogrids were fabricated. The 3D printed geogrids and the fiberglassgeogrids used in the actual project were tested in indoor tensile tests under different temperature conditions. The mechanicalproperties of the geogrids of the four kinds of materials and six kinds of temperature were analyzed. The microstructure of thegeogrids after tensile tests was investigated based on scanning electron microscopy technology to further analyze the effectsof different materials and temperatures on the mechanical properties of the geogrids. The results showed that the tensilestrength of PLA/CF geogrids and PLA geogrids decreased with increasing temperature. The tensile strength of fiberglassgeogrids increased with rising temperatures. The tensile strength of PLA/CF geogrids was significantly better than PLAgeogrids. Due to the addition of carbon fiber in PLA, PLA/CF can bear more tensile force at high temperatures. With theincrease of temperature, the elongation at break of PLA/CF geogrids and fiberglass geogrids increased, but the elongation atbreak of PLA geogrids decreased. The elongation at break of PLA/CF geogrids was significantly lower than that of PLAgeogrids. TPU geogrids had high tensile capacity in a high-temperature environment, and they also had high elasticity andmore significant elongation at break, which was not suitable to be used as geogrid material.
Zhao Liu,Qi Liu,Xinyuan Cao,Xuelei Zhang 한국기상학회 2022 Asia-Pacific Journal of Atmospheric Sciences Vol.58 No.2
Burning of fireworks at the Chinese New Year (CNY) is a traditional culture in China, but it may adversely deteriorate air quality, cause fire accident and damage residential health. Numeral studies had proved into this environmental problem on the city scale, it is also important to quantify the spatio-temporal effects of fireworks emissions on air quality and their associations with residential customs during the CNY. Based on the monitored data, we analyzed the characteristics of primary air pollutants caused by fireworks burning, as well as the temporal and spatial variations in the concentrations of particulate matters during the periods of fireworks burning and non-fireworks (one day before CNY’s Eve and two days after CNY’s Eve). The results indicated that the main air pollutants were particles released from fireworks burning over the whole China, with showing an obvious peak during the CNY of 2015 and 2016. The highest concentrations of particulate matters with size less than 10 μm (PM10) and 2.5 μm (PM2.5) were occurred during the early morning at 1:00–3:00 on 19th (2015), reaching 408 μg/m3 and 112 μg/m3in Northeast China (NEC), respectively. And the highest values in 2016 were 358 μg/m3 and 126 μg/m3, but occurred in North China (NC), respectively. It revealed that the residential customs had significant effects on the temporal distribution of fireworks pollution on the regional scale. The patterns of temporal variations in SO2, NO2 and CO were similar to those of PM10 and PM2.5, but CO was opposite to that of other pollutants. The spatial distributions of particulate pollutants concentrations showed that the most severely polluted regions were located at NEC, East China (EC) and Central China(CC), where had higher population density and gross domestic product (GDP) and local conservative customs. Otherwise, although stricter regulations were implemented in 2016, the concentrations of pollutants were still greater than them in 2015, revealing that meteorological conditions can have a significant effect on mass concentrations of particles. The governments should make control strategies of fireworks burning with comprehensive considering the balance between environmental protection and traditional culture heritage.
( Lili Gu ),( Chao Ding ),( Hongliang Tian ),( Bo Yang ),( Xuelei Zhang ),( Yue Hua ),( Yifan Zhu ),( Jianfeng Gong ),( Weiming Zhu ),( Jieshou Li ),( Ning Li ) 대한소화기기능성질환·운동학회(구 대한소화관운동학회) 2017 Journal of Neurogastroenterology and Motility (JNM Vol.23 No.2
Background/Aims Chronic intestinal pseudo-obstruction (CIPO) is a serious, life-threatening motility disorder that is often related to bacterial overgrowth. Fecal microbiota transplantation (FMT) results in restoration of the normal intestinal microbial community structure. We investigated the efficacy of FMT in the treatment of CIPO patients. Methods Nine patients (age 18-53 years) with CIPO were enrolled in this prospective, open-label study. Patients received FMT for 6 consecutive days through nasojejunal (NJ) tubes and were followed up for 8 weeks after treatment. We evaluated the rate of clinical improvement and remission, feeding tolerance of enteral nutrition, and CT imaging scores of intestinal obstructions. Lactulose hydrogen breath tests were performed before FMT and 8 weeks after FMT to evaluate for the presence small intestinal bacterial overgrowth (SIBO). Results FMT significantly alleviated bloating symptoms, and symptoms of pain were relieved 2 weeks after FMT. Enteral nutrition administered through a NJ tube after FMT was well-tolerated by 66.7% (6/9) of patients. CT scores of intestinal obstructions were significantly reduced after FMT (P = 0.014). SIBO was eliminated in 71.0% (5/7) of patients. Conclusions This pilot study demonstrated the safety of using FMT. FMT may relieve symptoms in selected patients with CIPO. FMT may also improve patient tolerance of enteral nutrition delivered via a NJ tube. (J Neurogastroenterol Motil 2017;23:289-297)