Investigation of the Mechanism of Period-doubling Bifurcation in Voltage Mode Controlled Buck-Boost Converter

Ling-Ling Xie,Ren-Xi Gong,Hao-Ze Zhuo,Jiong-Quan Wei 대한전기학회 2011 Journal of Electrical Engineering & Technology Vol.6 No.4

An investigation of the mechanism of period-doubling bifurcation in a voltage mode controlled buck-boost converter operating in discontinuous conduction mode is conducted from the viewpoint of nonlinear dynamical systems. The discrete iterative model describing the dynamics of the close-loop is derived. Period-doubling bifurcation occurs at certain values of the feedback factor. Results from numerical simulations and experiments are provided to verify the evolution of perioddoubling bifurcation, and the results are consistent with the theoretical analysis. These results show that the buck-boost converters exhibit a wide range of nonlinear behavior, and the system exhibits a typical period-doubling bifurcation route to chaos under particular operating conditions.

Improved Design of High School Girl`s Summer Uniform Based on Style Theory

Ling Xi Zhang,Jian Ping Wang 한국복식학회 2015 International journal of costume and fashion Vol.15 No.2

By means of statistical analysis and module concept, this paper investigated the current situation of high school girl’s uniform and put forward its improved design and database establishment. Combined with the survey data, the future design direction and trend of the high school girls’ uniform were proposed. By using modular design concept, the uniform is divided into five modules, and a style database has been built. Meanwhile, the parametric pattern database has been completed by using garment CAD system, based on the style database above, which has 42,336 possibilities to assemble a pair of school uniform. Combining with digital sewing techniques and by using computerized embroidery machine, the personalized design of high school girl’s summer uniform has been realized. And two simulated case have been given for examples to prove its feasibility. The idea of modular design and parametric design method proposed in this study offer references for establishing the modular design database and parametric pattern database for other types of school uniform and are of relatively high practical and theoretical value.

Structural Stability and Electronic and Optical Properties of Coinage-Metal (4; 2) Alloy Nanotubes: A First-Principles Study

Xi-Zhi Wang,Liang-Cai Ma,Ling Ma,Xue-Ling Lin,Jian-Min Zhang 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.6

Using rst-principles calculations, we have systematically investigated the structural stability and the electronic and optical properties of bimetallic AgAu, CuAu, and CuAg (4; 2) alloy nanotubes (NTs). We found that the tip-suspended AgAu and CuAu alloy NTs were stable structures due to the existence of local minima in both the binding energies and the string tensions variation with their unit-cell lengths and that the stability was enhanced when the content of Au was increased. However, a tip-suspended CuAg alloy NT would be difficult to form in future experiments. We also found that both the relativistic effect of elemental gold and the string tension applied by the tip contacts play important roles in suppressing effectively the self-purication effect, leading to the formation of these coinage alloy NTs. The quantum conductance of the stable alloy NTs is increased by 1G0 as compared with that of the corresponding pure coinage-metal NTs.

실험적 애니메이션의 Deformation에 관한 연구 Hand-drawn animation을 중심으로

이영희 ( Ling Xi Lee ),정성환 ( Sung Whan Chung ) 한국기초조형학회 2014 기초조형학연구 Vol.15 No.5

Hand-drawn animation은 실험애니메이션중의 중요한 형식과 표현방식으로 강한 친화력과 예술상에서의 특별한 의미를 지니고 있다. Hand-drawn animation은 여전히 많은 애니메이션 예술가들의 사랑하는 것을 있다. 어떠한 회화예술 표현수법이든 모두 Hand-drawn animation을 이용하여 창작이 가능하며 예술가들로 하여금 예술의 형식과 그 내포의미에 대한 더 깊은 탐구실험을 지속한다. 다양한 예술매체를 만들어내게 있다. Deformation은 애니메이션 기법 중 중요한 예술수단의 하나이며 Static와 Dynamic 두 가지 형식으로 나뉘어져 있다. Dynamic-Deformation은 Hand-drawn animation 중에서 유연하고 창의적인 모습으로 충분하게 표현되며 형태변환이 가장 효과적이며 애니메이션 중 에도 역동적인 형태로 표현되어진다. 움직임이 음악의 리듬을 타면서 새로운 의도로 전환될 때 관중들은 새로운 체험을 할 수 있는 동시에 심미적 유쾌함을 느끼면서 애니메이션 창작의 상상력과 창조력에 감탄할 수밖에 없다. 따라서 본문은 Hand-drawn animation을 연구체제로 하여 이에 대한 예술특징과 스타일, 심미적 관점에 대해서 비교론적 논증을 하였는데 주로 Hand-drawn animation을 활용한 형태전환현상에 대해 분석하고 도형설계와 게슈탈트의 심리학에 관한 연관이론을 표본으로 하였다. 새로운 견지로부터 Hand-drawn animation의 창작에 대해 새로운 가이드라인을 찾을 수 있었다.첫째로, Hand-drawn animation은 강한 친화감과 예술적인 흡인력이 있다. 둘째로, 이는 비교적 짧은 분량으로 깊은 의식형태와 풍부한 표정을 표현해 낼수 있다. 셋째로, 비전통적인 애니메이션 언어는 사람들의 잠재적인 상상력을 불러일으킬 수 있으며 이는 다른 시각적인 예술형태에서는 비교도 할수 없는 것이다. Deformation is an important artistic handling in animation. Dynamic deformation has been fully reflected in the hand-drawn experimental animation, being flexible and creative. This article focuses the compared arguments in its artistic features, style and aesthetic aspects. The study of hand-drawn experimental animation, focusing on the analysis of form conversion, re-examining the hand-drawn experimental animation from a new perspective using graphic design and the theory of Gestalt psychology. The experimental results shows: First, hand-drawn experiment all animation has a strong affinity and artistic appealing; Second, it can show profound ideological content and a wealth of emotion with the shorter length; Third, unconventional animated language can inspire people`s potential imagination, with which other visual art forms cannot be compared. This article may inspire the creation of hand-drawn experimental animation, and it also useful in the film and/or television as special effects and animation.

Investigation of the Mechanism of Period-doubling Bifurcation in Voltage Mode Controlled Buck-Boost Converter

Xie, Ling-Ling,Gong, Ren-Xi,Zhuo, Hao-Ze,Wei, Jiong-Quan The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.4

An investigation of the mechanism of period-doubling bifurcation in a voltage mode controlled buck-boost converter operating in discontinuous conduction mode is conducted from the viewpoint of nonlinear dynamical systems. The discrete iterative model describing the dynamics of the close-loop is derived. Period-doubling bifurcation occurs at certain values of the feedback factor. Results from numerical simulations and experiments are provided to verify the evolution of perioddoubling bifurcation, and the results are consistent with the theoretical analysis. These results show that the buck-boost converters exhibit a wide range of nonlinear behavior, and the system exhibits a typical period-doubling bifurcation route to chaos under particular operating conditions.

Improved Design of High School Girl's Summer Uniform Based on Style Theory

Zhang, Ling-Xi,Wang, Jian-Ping The Korean Society of Costume 2015 International journal of costume and fashion Vol.15 No.2

By means of statistical analysis and module concept, this paper investigated the current situation of high school girl's uniform and put forward its improved design and database establishment. Combined with the survey data, the future design direction and trend of the high school girls' uniform were proposed. By using modular design concept, the uniform is divided into five modules, and a style database has been built. Meanwhile, the parametric pattern database has been completed by using garment CAD system, based on the style database above, which has 42,336 possibilities to assemble a pair of school uniform. Combining with digital sewing techniques and by using computerized embroidery machine, the personalized design of high school girl's summer uniform has been realized. And two simulated case have been given for examples to prove its feasibility. The idea of modular design and parametric design method proposed in this study offer references for establishing the modular design database and parametric pattern database for other types of school uniform and are of relatively high practical and theoretical value.

Cervical Cancer Mortality Trends in China, 1991-2013, and Predictions for the Future

Du, Pei-Ling,Wu, Ku-Sheng,Fang, Jia-Ying,Zeng, Yang,Xu, Zhen-Xi,Tang, Wen-Rui,Xu, Xiao-Ling,Lin, Kun Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15

Background: To analyze cervical cancer mortality trends in China from 1991-2013 and forecast the mortality distribution in future five years (2014-2018), and provide clues for prevention and treatment. Materials and Methods: Mortality data for cervical cancer in China from 1991 to 2013 were used to describe the epidemiological characteristics and distribution, including the trend of the standardized mortality rate, urban-rural differences, and age variation. Trend-surface analysis was used to analyze the geographical distribution of mortality. Curve estimation, time series, gray modeling, and joinpoint regression were performed to predict and forecast mortality trends. Results: In recent years, the mortality rate of cervical cancer has increased, and there is also a steady increase in the incidence from 2003 to 2013 in China. Mortality rates in rural areas are higher than in urban areas. The mortality dramatically increases in the 40+ yr age group, reaching a peak in the >85 yr age group. In addition, geographical analysis showed that the cervical cancer mortality increased from the southwest to west-central and from the southeast to northeast of the country. Conclusions: The incidence rate and the mortality rate are increasing from 1991 to 2013, and the predictions show this will continue in the future. Thus, implementation of prevention and management programs for cervical cancer are necessary in China, especially for rural areas, young women in urban areas, and high risk regions (the west-central).

Mortality Characteristic and Prediction of Nasopharyngeal Carcinoma in China from 1991 to 2013

Xu, Zhen-Xi,Lin, Zhi-Xiong,Fang, Jia-Ying,Wu, Ku-Sheng,Du, Pei-Ling,Zeng, Yang,Tang, Wen-Rui,Xu, Xiao-Ling,Lin, Kun Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.15

Background: To analyze the mortality distribution of nasopharyngeal carcinoma in China from 1991 to 2013, to predict the mortality in the ensuing five years, and to provide evidence for prevention and treatment of nasopharyngeal carcinoma. Materials and Methods: Mortality data for Nasopharyngeal Carcinoma in China from 1991 to 2013 were used to describe its epidemiological characteristics, such as the change of the standardized mortality rate, sex and age differences, urban-rural differences. Trend-surface analysis was used to study the geographical distribution of the mortality. Curve estimation, time series, gray modeling, and joinpoint regression were used to predict the mortality for the ensuing five years in the future. Results: In China, the standardized mortality rate of Nasopharyngeal Carcinoma increased with time from 1996, reaching the peak values of $1.45/10^5$ at the year of 2002, and decreased gradually afterwards. With males being 1.51 times higher than females, and the city had a higher rate than the rural during the past two decades. The mortality rate increased from age 40. Geographical analysis showed the mortality rate increased from middle to southern China. Conclusions: The standardized mortality rate of Nasopharyngeal Carcinoma is falling. The regional disease control for Nasopharyngeal Carcinoma should be focused on Guangdong province of China, and the key targets for prevention and treatment are rural men, especially after the age of 40. The mortality of Nasopharyngeal Carcinoma will decrease in the next five years.

关于中国山东省大数据企业创意役量与组织创新的研究

ling ming Kong,김영길,xi ze Geng 국민대학교 중국인문사회연구소 2020 중국지식네트워크 Vol.16 No.-

Purpose The purpose of this paper is to prove the effect of creative competencies on organizational innovation, and provides a new theoretical basis for organizational innovation research. Design- This paper studies organizational innovation by using creative competencies model and 3M organizational achievement model. Findings - This paper proves that the Portfolio level of the original 5 creative competencies influences the level of organizational innovation of enterprises. The higher the level of organizational innovation, the organizational achievements are higher. Research Implications - In this paper, the proposal of the original 5 creative competencies realizes the concrete, scientific and theoretical connotation of the creative competencies, which provides a powerful theoretical method for the follow-up research. 本文通过关于创意役量与组织创新关系的理论与实证研究,证明了创意役量对组织创新的影响作用,并为组织创新研究提供了全新的理论依据。以创意役量理论和3M组织成果模型为工具研究组织创新问题。本论文证明根源性5创意役量的Portfolio程度影响了企业 的组织创新水平,企业的组织创新水平越高,组织成果就越好。根源性5创意役量的提出实现了创意役量内涵的具体化,科学化,理论化,为后续研究提供了有力的理论支持。

Molecular Identification of a Trichinella Isolate from a Naturally Infected Pig in Tibet, China

Ling Zhao Li,Zhong Quan Wang,Peng Jiang,Xi Zhang,Hui Jun Ren,Jing Cui 대한기생충학열대의학회 2011 The Korean Journal of Parasitology Vol.49 No.4