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Zi-Xing Liu,Zi-Yun Wang,Yan Wang,Zhi-Cheng Ji 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.6
To manage the state estimation and fault-diagnosis problem of linear discrete uncertain systems with time delay, a state estimation and fault-diagnosis algorithm based on an improved zonotopic Kalman filter is proposed under the assumption that the process interference and measurement noise of the systems are unknown but bounded. First, zonotopes are used to contain the nonzero initial conditions of the system with time delay, and an optimal zonotopic Kalman filter is designed by using an iterative replacement method to determine the relationship between the current time and the delayed time. Subsequently, the optimal observer gain of the optimal zonotopic Kalman filter is designed by minimizing the size of the zonotopic sets to estimate the state sets. Next, the fault occurrence is detected by determining whether the true output value of the system is within the upper and lower bounds of the estimated output value, and the fault identification process is completed by the matching probability of the fault type. Finally, the fault-diagnosis of a numerical system, and the pitch system of a wind turbine are used as examples to demonstrate the effectiveness and feasibility of the proposed method for systems with time delay by analyzing the fault diagnosis results. A comparison with a normal fault-matching method indicates that the proposed fault-diagnosis algorithm is more rapid in fault identification.
림자성(LIN ZI-CHENG),권오정(KWON OH-JUNG) 한국주거학회 2021 한국주거학회 학술대회논문집 Vol.33 No.2
The purpose of the study is to conclude the current situations of dwelling environments and objects are foreign university students in Seoul, South Korea. On-line questionnaire survey was used as main method to receive information, and period was from July 20th to August 29th, 2021. The samples were consisted by 72 respondents. The survey was made up by general characteristics, external and internal dwelling characteristics, life styles separated into total 48 items. Based on the data, descriptive statistics, ANOVA and other average data analysis methods were used to gain the values of dwelling satisfaction. Combined the data in different characteristics to compare, and try to discover the differences. Briefly arrange the results as follows: 1) Most of international students live in multiplex housing nearby colleges that they belong to. 2) Large part of students’ life cost is in range of 900,000~1,100,000won and dwelling cost is 400,000~600,000won, a main cost of it each month. 3) Most of students satisfy with their dwelling situations especially like cooling-heating system, but they are dissatisfied with the integrity of furniture or home appliances, storage and so on.
Morphological Factors and Cardiac Doses in Whole Breast Radiation for Left-sided Breast Cancer
Guan, Hui,Dong, Yuan-Li,Ding, Li-Jie,Zhang, Zi-Cheng,Huang, Wei,Liu, Cheng-Xin,Fu, Cheng-Rui,Zhu, Jian,Li, Hong-Sheng,Li, Miao-Miao,Li, Bao-Sheng Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.7
Background: To investigate the impact of the breast size, shape, maximum heart depth (MDH), and chest wall hypotenuse (the distance connecting middle point of the sternum and the length of lung draw on the selected transverse CT slice) on the volumetric dose to heart with whole breast irradiation (WBI) of left-sided breast cancer patients. Materials and Methods: Fifty-three patients with left-sided breast cancer undergoing adjuvant intensity-modulated radiotherapy (IMRT) were enrolled in the study. The primary breast size and shape, MHD and DCWH (chest wall hypotenuse) were contoured on radiotherapy (RT) planning CT slices. The dose data of hearts were obtained from the dose-volume histograms (DVHs). Data were analyzed by one-way analysis of variance (ANOVA), Student's t-test and linear regression analysis. Results: Breast size was independent of heart dose, whereas breast shape, MHD and DCWH were correlated with heart dose. The shapes of breasts were divided into four types, as the flap type, hemisphere type, cone type and pendulous type with heart mean dose being $491.8{\pm}234.6cGy$, $752.7{\pm}219.0cGy$, $620.2{\pm}275.7cGy$, and $666.1{\pm}238.0cGy$, respectively. The flap type of breasts shows a strong statistically reduction in heart dose, compared to others (p=0.008 for V30 of heart). DCWH and MHD were found to be the most important parameters correlating with heart dose in WBI. Conclusions: More attention should be paid to the heart dose of non-flap type patients. The MHD was found to be the most important parameter to correlate with heart dose in tangential WBI, closely followed by the DCWH, which could help radiation oncologists and physicsts evaluate heart dose and design RT plan in advance.
Zi-Yi ZHANG,Yu-Ping ZHA,San-ShanCAI,Cheng-Hao HONG,Peng Liang,Jing-Yuan CHEN 한국곤충학회 2020 Entomological Research Vol.50 No.1
Monochamus alternatus (Hope) is a severe wood-boring pest in coniferous forests and a major vector of pine wilt disease in East Asia. Harmonic radar is a powerful tool for studying the dispersal behavior of insects and it could be applied to control pine wilt disease. In this study, we validated the application of harmonic radar for analyzing the dispersal behavior of M. alternatus beetles in a field environment. We determined the wing capacities of the beetles and the effects of electronic tagging and marking on their movement, flight ability, survivorship, and food consumption in the laboratory to confirm the suitability of this technique. The detection rate and recovery rate for beetles were analyzed separately using radar on caged pine stands and in the field environment. The results showed that the minimum wing capacity of the Japanese pine sawyer was 24.9 mg, which was seven times the weight of the electronic tag (3.5 mg). Marking and tagging the beetles had no significant adverse effects on their movement, flight capacity, food consumption, and survivorship. The detection rate using the radar system and recovery rate based on visual observations of the beetles in caged pines were both 95.6%. However, in the field environment, the detection and recovery rates were only 55.6% and 37.8% after one week, respectively, and 33.3% and 7.8% after two weeks. Harmonic radar is a promising technique for studying the dispersal behavior of the Japanese pine sawyer, but its performance is not satisfactory and major improvements are required for both the radar system and electronic tags.
Sliding mode control based on neural network for the vibration reduction of flexible structures
Zi-chen Deng,Yong-an Huang,Wen-cheng Li 국제구조공학회 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.4
A discrete sliding mode control (SMC) method based on hybrid model of neural network and nominal model is proposed to reduce the vibration of flexible structures, which is a robust active controller developed by using a sliding manifold approach. Since the thick boundary layer will reduce the virtue of SMC, the multilayer feed-forward neural network is adopted to model the uncertainty part. The neural network is trained by Levenberg-Marquardt backpropagation. The design objective of the sliding mode surface is based on the quadratic optimal cost function. In course of running, the input signal of SMC come from the hybrid model of the nominal model and the neural network. The simulation shows that the proposed control scheme is very effective for large uncertainty systems.
Zi-Hao LYU,Delong KONG,Jie CHENG,Tong Lin 한국곤충학회 2020 Entomological Research Vol.50 No.2
Cytochrome P450 monooxygenases (CYPs) play an important role in the decomposition of insecticides. Plecoptera oculata Moore is a lepidopteran forestry pest that severely affects Dalbergia odorifera T. Chen. In this study, 27 putative CYP genes were identified in the transcriptome of larval P. oculata. Phylogenetic analysis showed that these genes are grouped into four clans, 15 families, and 22 subfamilies. The tissue-specific expression profile for each gene was determined using real-time reverse transcription-quantitative PCR (RT-qPCR), and the 27 genes were found to be ubiquitously expressed, mainly in the midgut, Malpighian tubules, and fat body. The expression profiles of all 27 PoCYP genes exposed to half the lethal concentration (LC50) of sendebao and lambda-cyhalothrin were determined using RT-qPCR. The results showed that six and twelve PoCYP genes were significantly down- and up-regulated, respectively, by exposure to sendebao, and three and twelve PoCYP genes were significantly down- and up-regulated, respectively, by exposure to lambda-cyhalothrin. To the best of our knowledge, this study is the first to show the expression of CYP genes in P. oculata. Our results provide a basis for further investigation of the roles of PoCYP genes in insecticide detoxification and as potential targets for novel pesticides.
Nian Cheng,Weiwei Li,Menghan Zhang,Hangjuan Wu,Shujie Sun,Zhiqiang Zhao,Zhenyu Xiao,Zhuzhu Sun,Wei Zi,Liang Fang 한국물리학회 2019 Current Applied Physics Vol.19 No.1
Employing additive to regulate the morphology of perovskite film is an effective method to enhance both the power conversion efficiency and long term stability of organic-inorganic hybrid perovskite solar cells. Here, we demonstrate that guanidinium thiocyanate (GuSCN) is a suitable additive for methylammonium lead iodide (MAPbI3) perovskite materials. Addition of GuSCN into MAPbI3 can simultaneously enhance the crystallinity, enlarge the crystal size, and reduce the trap density of the perovskite films. As a result, the MAPbI3 perovskite with 10% GuSCN exhibits superior power conversion efficiency of 16.70% compared to the pristine MAPbI3 perovskite solar cell (15.57%). At the same time, the MAPbI3 perovskite solar cell with GuSCN additive shows better stability, power conversion efficiency retains ∼90% of its initial value compared to only ∼60% for pristine MAPbI3 perovskite solar cells after being stored for 15 days without encapsulation
Hua Zi Huang,Cheng Hao Zhang,Hyung Kweon Yoon,Tae Cheol Seo 한국원예학회 2007 Horticulture, Environment, and Biotechnology Vol.48 No.1
Nutrient solution for various Chenopodiaceae leaf vegetables was developed. Various strength (1/2, 1, and 3/2) of nutrient solution recommended by National Horticultural Research Institute, Korea was applied to the crops in deep flow technique system for 27 days. Growth of ‘Atras’ spinach, ‘Detroit Dark’ beet, and ‘Swiss’ red chard was highest in the treatment of 3/2 strength. The proper constitution of nutrient solution for the Chenopodiaceae leaf vegetables was 11 N, 2.5 P, 8 K, 2 Ca, and 2 me/L Mg. The crops were grown two times in March and September to examine the appropriateness of the nutrient solution. Relative growth rate and the amount of ascorbic acid treated with the nutrient solution were increased by 1.1-1.4 and 1.1-1.2 times, respectively, and the amount of chlorophyll was increased by 1.0-1.2 times.