Research on the Discrimination of Hatching Eggs Activity Based on Thermal Imaging : A Food Nondestructive Testing Practice

Liu Hai-ling,Cai Jian-rong,Sun Li,Yuan Lei-ming,Liu Meng-lei 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.2

The hatching eggs in 4-16 days incubation were from incubator of 38.5℃ to 22℃ for natural cooling and the time series images were acquired by thermal imaging technology. Analyzing the cooling curve and the cooling area and region growing, ellipse fitting, morphological processing and other methods were used to extract eggs region of interest; time series images superposition and contrast enhancement were used to raise the temperature close to the different categories of eggs gray differences; the ratio of gray value≦150 and entire ROI area was seen as characteristic parameters and the decision threshold was set according to minimum error rate Bayes rule. The non-fertilized eggs in incubating 4 days was 89.6% overall recognition and the dead embryo eggs in incubating 16 days was 96.3% overall recognition. Research showed that thermal imaging technology combined image processing technology can achieve non-destructive testing of hatching eggs activity.

Load adaptability of hybrid harmonic reduction method at DC-link of series-connected multi-pulse rectifiers

Meng, Fangang,Liu, Wei,Yin, Xinyu,Gao, Lei The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10

To verify the harmonic suppression capability of a series-connected 36-pulse rectifier and to improve the load adaptability of its harmonic injection circuit, a reliable selection method for the DC-side output capacitor of the rectifier is proposed. The sufficient and necessary conditions for ensuring the rectifier can operate under the 36-pulse rectification state is summarized, which is the basis for selecting capacitance values under different load types. After using the proposed selection method for the output capacitors, simulation and experimental results indicate that the hybrid harmonic suppression circuit has good performances under a resistive load, a resistive-inductive load, or a load mutation.

Effect of Sophora flavescens on the pharmacokinetics of carbamazepine in rats

Lei Shi,Xue-Liang Dang,Xin-You Liu,Hua-Mei Wei,Meng-Meng Yang,Yan Zhang 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.12

Carbamazepine (CBZ), an antiepilepticwith narrow therapeutic window, is a substrate ofCYP 3A4 which metabolizes CBZ to carbamazepine-10,11-epoxide (CBZE). CBZE is an active and toxicitymetabolite, and it is a substrate of MRP-2. UsingCBZ for a long time can cause hepatic injury. Sophora flavescens (SF) is a medicinal herb used forthe protected hepatic injury. This study investigatedthe acute and chronic effects of SF on the pharmacokineticsof CBZ in rats. The concentrations of CBZand CBZE in plasma and tissues were determined byHPLC method. The results showed that SF whichsignificantly decreased the AUC0-t of CBZ, increasedCBZE conversely. Tissue analysis showed that theconcentrations of CBZ and CBZE in brain and liverwere decreased by SF. In addition, the distribution ofCBZE in kidney was reduced significantly, whichinfluenced the CBZE excretion and increased the drugtoxic potentially. Results in the current study suggestthat patients using CBZ might be cautioned in the useof SF extract or Sophora-derived products. Meanwhile,patients receiving drugs which are substrates ofCYP 3A4 and/or MRP-2 should be advised of thepotential herb–drug interaction to reduce the risk oftherapeutic failure or increased toxicity of conventionaldrug therapy.

Creating Knowledge Graph of Electric Power Equipment Faults Based on BERT–BiLSTM–CRF Model

Meng Fanqi,Yang Shuaisong,Wang Jingdong,Xia Lei,Liu Han 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4

Creating a large-scale knowledge graph of electric power equipment faults will facilitate the development of automatic fault diagnosis and intelligent question answering (QA) in the electric power industry. However, most existing methods have lower accuracy in Chinese entity recognition, thus it is hard to build such a high-quality knowledge graph by extracting knowledge from Chinese technical literature. To solve the problem, a novel model called BERT–BiLSTM–CRF is proposed. It blends Bi-directional Encoder Representation from Transformers (BERT), Bi-directional Long Short-Term Memory (BiLSTM), and Conditional Random Field (CRF). The model fi rstly identifi es and extracts electric power equipment entities from preprocessed Chinese technical literature. Then, the semantic relations between the entities are extracted based on the relation classifi cation method based on dependency parsing. Finally, the extracted knowledge is stored in the Neo4j database in the form of the triplet and visualized in the form of a graph. Through the above steps, a Chinese knowledge graph of electric power equipment faults can be built. The novelty of the model just lies in its subtle blend: the BERT module can not only learn phrase-level information representation, but also learn rich semantic information features; the CRF module realizes the constraint on the label prediction value and reduces the irregular recognition rate, so the accuracy rate of entity recognition is improved. Taking the Chinese technological literature, which is about fault diagnosis of electric power equipment as the experimental object, the experimental results show that the model identifi es and extracts Chinese entities more accurately than traditional methods. Thus, a comprehensive and accurate Chinese knowledge graph of electric power equipment faults could be constructed more easily.

COMMON FIXED POINT THEOREMS FOR A PAIR OF MAPPINGS SATISFYING CONTRACTIVE INEQUALITIES OF INTEGRAL TYPE

ZEQING LIU,Lei Meng,Na Liu,CHAHN YONG JUNG 경남대학교 수학교육과 2020 Nonlinear Functional Analysis and Applications Vol.25 No.1

Five results involving the existence and uniqueness of common fixed points for mappings satisfying contractive inequalities of integral type in complete metric spaces are proved. And two examples are given. The results presented in this paper generalize or differ from a few results in the literature.

COMMON STATIONARY POINTS FOR MULTIVALUED CONTRACTIVE MAPPINGS OF INTEGRAL TYPE WITH δ-DISTANCE

ZEQING LIU,Ying Liu,Shin Min Kang,Lei Meng 경남대학교 수학교육과 2018 Nonlinear Functional Analysis and Applications Vol.23 No.3

The existence and uniqueness of stationary points for certain multi-valued con- tractive mappings of integral type with δ-distance in complete metric spaces are established and three illustrative examples are provided. The results presented in this paper extend or differ from several known results in the literature.

Identification of Primary Failure Modes of Tunnel System and Influence of Supporting Structures on Tunnel System Reliability using Multiple Response Surfaces

Zhiliang Liu,Liang Li,Guangming Yu,Jun Hu,Houlai Lin,Chunli Li,Shibao Lu,Kaiqi Meng,Jun Lei 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2

A method of calculating the failure probability of the tunnel system combining finite element numerical simulation with multiple response surface method (MRSM) and Monte-Carlo simulation (MCS) is presented. The applicability of the proposed methodology is verified through a subway interval soft rock tunnel in Qingdao, China. The sensitivity of Monte-Carlo sampling number and coefficients of variation for rock masses on the failure probability of tunnel system is conducted. The primary failure modes in tunnel system are identified by reanalyzing the failure samples. The simulation results demonstrate that the failure probability of a tunnel system within soft upper and hard lower surrounding rock mass is mainly attributed to the soft upper part of the surrounding rock. The coefficients of variation of the elastic modulus E1 and the internal friction angle ϕ1 of the pebble layer (soft upper part) have significant effect on the failure probability. The failure probability of tunnel system increases as the coefficients of variation of E1 and ϕ1 increase. Two primary failure modes are found to contribute to the tunnel system reliability. The effect of rock bolt length L and pipe-roof thickness H on tunnel system reliability and two primary failure modes as well are investigated. The simulation results indicate that both the enhancements in L and H tend to be more effective than the enhancement in either L or H if a small target failure probability of tunnel system is expected. The supporting structures design can be performed based on the potential sets of (L, H) satisfying target failure probability.

Improvement of Lipid and Terpenoid Yield in Thraustochytrids Using Chemical Regulators: A Review

Zi-Lei Chen,Lin-Hui Yang,Ling-Ling Tong,Yue Wang,Meng-Zhen Liu,Dong-Sheng Guo 한국생물공학회 2023 Biotechnology and Bioprocess Engineering Vol.28 No.5

For the increasing demand for lipids and terpenoids in humans, biological fermentation has become an attractive choice due to the safety and sustainability. Thraustochytrids have been identified as promising producers of polyunsaturated fatty acids because of their high lipid content and simple fatty acid composition. In addition, thraustochytrids are also potential producers of terpenoids for their completed mevalonate pathway. Chemical regulators can be used to stimulate or inhibit metabolic pathways, which are equivalent to effects of overexpression and suppression approaches. The application of chemical regulators is potentially an easy and practical approach to improve the lipid and terpenoid yield in thraustochytrids, which has become a research focus. In this review, the mechanisms of chemical regulators promoting lipid and terpenoid biosynthesis in thraustochytrids are elucidated. Various chemical regulators which can directly enhance the biosynthesis of lipids and terpenoids are summarized depending on the type of chemicals. In addition, some chemical regulators are demonstrated to indirectly improve lipid and terpenoid yield by reducing the conversion of metabolites and reducing oxidative stress. Therefore, the addition of chemical regulators can be a useful alternative strategy for improving lipid and terpenoid accumulation in large-scale cultivation of thraustochytrids.

Seismic Dynamic Response Analysis of Mountain Tunnels with Seismic Reduction and Isolation Measures

Zhongxian Liu,Tian-Chun Ai,Lei Huang,Si-Bo Meng,Ping-Lin Jiang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.1

In this paper, the multi-domain indirect boundary element method (IBEM) is developed for the seismic response analysis of double-line mountain tunnels with seismic reduction and isolation measures. The dynamic response of the tunnel with seismic reduction and isolation measures under incident SV waves is analyzed, and the effect of the mountain topography on the tunnel is also investigated. Further, the effects of the isolation layer and the grouting reinforcement with different thicknesses on the seismic response of the tunnel are discussed in detail. The results show that the scattering of seismic waves by mountain topography significantly increases tunnel stress. In general, with the increase of incident frequency, the isolation layer will increase the peak displacement of the tunnel by about 12.7% at most, and the isolation ratio of the isolation layer on the tunnel stress exceeds 40%. The seismic reduction performance of the grouting reinforcement also depends on the incident frequency, and the amplitude decreases by approximately 20% at most frequencies. However, it is possible that the lining displacement under high-frequency waves becomes larger. This method can provide valuable insights and assessments for damage prediction.

Long-term Prognosis in Hepatocellular Carcinoma Patients after Hepatectomy

Zhou, Lei,Liu, Chang,Meng, Fan-Di,Qu, Kai,Tian, Feng,Tai, Ming-Hui,Wei, Ji-Chao,Wang, Rui-Tao Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.2

Background: The hepatocellular carcinoma is very common in China. Our aim in this report was to investigate clinical and pathological factors based on the current decade data that could influence prognosis of HCC patients after hepatectomy. Methods: Between 2002 and 2009, all patients undergoing hepatectomy for HCC were followed up and reviewed retrospectively. Prognostic factors were studied by univariate and multivariate analysis, with Kaplan-Meier and Cox multivariate survival analyses. Results: Complete clinicopathologic and follow-up data were available for 114 patients. The estimated cumulative survival rates at 1, 3, and 5 yr were 84.6%, 60.2% and 51.8%, respectively. On univariate analysis, key prognostic factors were AFP level, GGT level, tumor size, number of tumors, portal vein invasion, liver cirrhosis status and TNM stage. In the multivariate analysis, tumor size, GGT level, liver cirrhosis status and portal vein invasion were significantly associated with patients' prognosis. Conclusion: Through follow-up of a relatively large cohort of Chinese patients, tumor size, GGT level, liver cirrhosis status, portal vein invasion were revealed as important factors for long-term survival after hepatectomy. Early diagnosis for tumor and the improvement of liver function before surgery are important ways to improve the prognosis.