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Lv Yan Ling,Tengchong,Ge Bao Jun,Wen Ruxin,Xiao Shiyong,Li Mengqiao 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.5
Choosing a correct main protection configuration schemes for stator internal short circuits in generator is the premise of safe and reliable operation of the large generator. This paper firstly analyzes the general large hydro-generator stator internal short circuit fault type and fault number. It mainly does some statistics works on SF600-42/1380 generator fault location and fault number. And then through the finite element method, calculate each phase and each branch current if the generator internal short circuit happens. In the paper, we calculate the sensitivity of various kinds of main protection scheme. Get the dead zone position which easily lets the main protection device take action. Finally we summarize various factors that determine SF600-42/1380 generator main protection scheme of configuration.
Establishment and Clinical Application of an Electronic Database for Breast Cancer in China
Lv, Yong-Gang,Huang, Mei-Ling,Xiao, Jing-Jing,Ling, Rui Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.2
Purpose: To establish a database for breast cancer patients to save and manage clinical data and to preliminarily investigate its clinical application. Materials and Methods: Information on breast cancer patients hospitalized in our department from 2008.01 to 2013.01 were input into our breast cancer management system. SPSS 16.0 software was used as a convenient reference to evaluate the accuracy of the newly built database. Results: A database of 2403 breast cancer patients was successfully established. Information in the database clearly displayed capabilities of storage, addition, retrieval, statistical analysis and other functions. As the continuously updated database showed, the distribution of age, sex, nationality, allergy history, pausimenia and marriage of patients was identical to that achieved by SPSS analysis, indicating reliable and accurate data analysis. Conclusions: The described database is easy and convenient to operate and manage, and should prove suitable for application in clinical research and treatment.
An FPGA-Based Modified Adaptive PID Controller for DC/DC Buck Converters
Ling Lv,Changyuan Chang,Zhiqi Zhou,Yubo Yuan 전력전자학회 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2
On the basis of the conventional PID control algorithm, a modified adaptive PID (MA-PID) control algorithm is presented to improve the steady-state and dynamic performance of closed-loop systems. The proposed method has a straightforward structure without excessively increasing the complexity and cost. It can adaptively adjust the values of the control parameters (Kp, Ki and Kd) by following a new control law. Simulation results show that the line transient response of the MA-PID is better than that of the adaptive digital PID because the differential coefficient Kd is introduced to changes. In addition, experimental results based on a FPGA indicate that the MA-PID control algorithm reduces the recovery time by 62.5% in response to a 1V line transient, 50% in response to a 500mA load transient, and 23.6% in response to a steady-state deviation, when compared with the conventional PID control algorithm.
An FPGA-Based Modified Adaptive PID Controller for DC/DC Buck Converters
Lv, Ling,Chang, Changyuan,Zhou, Zhiqi,Yuan, Yubo The Korean Institute of Power Electronics 2015 JOURNAL OF POWER ELECTRONICS Vol.15 No.2
On the basis of the conventional PID control algorithm, a modified adaptive PID (MA-PID) control algorithm is presented to improve the steady-state and dynamic performance of closed-loop systems. The proposed method has a straightforward structure without excessively increasing the complexity and cost. It can adaptively adjust the values of the control parameters ($K_p$, $K_i$ and $K_d$) by following a new control law. Simulation results show that the line transient response of the MA-PID is better than that of the adaptive digital PID because the differential coefficient $K_d$ is introduced to changes. In addition, experimental results based on a FPGA indicate that the MA-PID control algorithm reduces the recovery time by 62.5% in response to a 1V line transient, 50% in response to a 500mA load transient, and 23.6% in response to a steady-state deviation, when compared with the conventional PID control algorithm.
Lv Duo-Duo,Zhou Ling-Yun,Tang Hong 생화학분자생물학회 2021 Experimental and molecular medicine Vol.53 No.-
Hepatocyte nuclear factor 4α (HNF4α), a member of the nuclear receptor superfamily, is described as a protein that binds to the promoters of specific genes. It controls the expression of functional genes and is also involved in the regulation of numerous cellular processes. A large number of studies have demonstrated that HNF4α is involved in many human malignancies. Abnormal expression of HNF4α is emerging as a critical factor in cancer cell proliferation, apoptosis, invasion, dedifferentiation, and metastasis. In this review, we present emerging insights into the roles of HNF4α in the occurrence, progression, and treatment of cancer; reveal various mechanisms of HNF4α in cancer (e.g., the Wnt/β-catenin, nuclear factor-κB, signal transducer and activator of transcription 3, and transforming growth factor β signaling pathways); and highlight potential clinical uses of HNF4α as a biomarker and therapeutic target for cancer.
Wei, Ling,Wang, Xing-Wu,Sun, Ju-Jie,Lv, Li-Yan,Xie, Li,Song, Xian-Rang Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.3
Mediator 19 (Med19) is a component of the mediator complex which is a coactivator for DNA-binding factors that activate transcription via RNA polymerase II. Accumulating evidence has shown that Med19 plays important roles in cancer cell proliferation and tumorigenesis. The involvement of Med19 in sensitivity to the chemotherapeutic agent cisplatin was here investigated. We employed RNA interference to reduce Med19 expression in human non-small cell lung cancer (NSCLC) cell lines and analyzed their phenotypic changes. The results showed that after Med19 siRNA transfection, expression of Med19 mRNA and protein was dramatically reduced (p<0.05). Meanwhile, impaired growth potential, arrested cell cycle at G0/G1 phase and enhanced sensitivity to cisplatin were exhibited. Apoptosis and caspase-3 activity were increased when cells were exposed to Med19 siRNA and/or cisplatin. The present findings suggest that Med19 facilitates tumorigenic properties of NSCLC cells and knockdown of Med19 may be a rational therapeutic tool for lung cancer cisplatin sensitization.
Design of Open Language Laboratory Information System in Network Environment
Hua Lv,Mei Ling Jiang,Cheng Shuang Han 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.7
College language lab is “the second classroom” of foreign language teaching. It is a place of effectively cultivating students' ability of self-learning and practicing. This paper analyzes the significance and role of the language laboratory for cultivating students' self-learning and innovation ability, designs out the model of function structue for the openning of the language laboratory, proposes the form of database design, and discusses the system architecture.
Influence of Salts on Compressibility of Loess in Heifangtai Terrace, China
( Borui Lv ),( Ling Xu ),( Chongyang Gao ),( Dongdong Yan ),( Yili Wan ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Many researches had demonstrated that salts, including soluble and insoluble salts, played a considerable role on loess structure and mineral composition. It was found salts were leached out of the loess because of agricultural irrigation, in Heifangtai terrace in China, where a large number of landslides occurred. To study the effect of salts on compressibility of loess, a series of one-dimensional oedometer tests were performed. The loess washed by water or acetic acid solution, which was to avoid the interference of original salts, was powdered and reconstituted with distilled water, then the samples were immersed in NaCl solution or added a certain mass of lime and contacted with carbon dioxide to form calcium carbonate. Comparing the compression behavior, the results showed that the variation of compressibility of samples reconstituted by loess treated by distilled water or acid solution was indistinctive. The NaCl solution had a little effect on loess compressibility at high water content, while the NaCl solution would weaken loess compressibility at low water content, compared with samples treated by distilled water, and a threshold water content was gained. Besides, the compressibility of loess treated by adding lime was strongly improved. These findings can rich the study in microstructure of loess and are of importance to guide the geotechnical application.
Dependence of Cross-Termination Rate on RAFT Agent Concentration in RAFT Polymerization
Yanggang Gao,Ling Lv,Gang Zou,Qijin Zhang 한국고분자학회 2017 Macromolecular Research Vol.25 No.9
Rate retardation is an intrinsic property of reversible addition-fragmentation chain transfer (RAFT) radical polymerization. One of reasons for this phenomenon is cross-termination reaction between intermediate radicals and other active radicals. With the help of Stationary State Model and experimentally controlling on kt,cross, the kinetics of styrene RAFT polymerization were performed at different concentrations of RAFT agent. Results show that there is a difference in two effects of cross-termination rate coefficient and concentration of intermediate radicals on cross-termination at different RAFT agent concentrations: at the low concentration range, the cross-termination reaction is mainly affected by its rate coefficient, and at the high concentration range, the cross-termination reaction is mainly affected by the concentration of the intermediate radicals. It shows that there is an optimal concentrations of RAFT agent for a RAFT polymerization with the least rate retardation by considering the balance between these two effects.