Field measurements of wind pressure on an open roof during Typhoons HaiKui and SuLi

Feng, Ruoqiang,Liu, Fengcheng,Cai, Qi,Yan, Guirong,Leng, Jiabing Techno-Press 2018 Wind and Structures, An International Journal (WAS Vol.26 No.1

Full-scale measurements of wind action on the open roof structure of the WuXi grand theater, which is composed of eight large-span free-form leaf-shaped space trusses with the largest span of 76.79 m, were conducted during the passage of Typhoons HaiKui and SuLi. The wind pressure field data were continuously and simultaneously monitored using a wind pressure monitoring system installed on the roof structure during the typhoons. A detailed analysis of the field data was performed to investigate the characteristics of the fluctuating wind pressure on the open roof, such as the wind pressure spectrum, spatial correlation coefficients, peak wind pressures and non-Gaussian wind pressure characteristics, under typhoon conditions. Three classical methods were used to calculate the peak factors of the wind pressure on the open roof, and the suggested design method and peak factors were given. The non-Gaussianity of the wind pressure was discussed in terms of the third and fourth statistical moments of the measured wind pressure, and the corresponding indication of the non-Gaussianity on the open roof was proposed. The result shows that there were large pulses in the time-histories of the measured wind pressure on Roof A2 in the field. The spatial correlation of the wind pressures on roof A2 between the upper surface and lower surface is very weak. When the skewness is larger than 0.3 and the kurtosis is larger than 3.7, the wind pressure time series on roof A2 can be taken as a non-Gaussian distribution, and the other series can be taken as a Gaussian distribution.

Stability and non-stationary vibration analysis of beams subjected to periodic axial forces using discrete singular convolution

Zhiwei Song,Wei Li,Guirong Liu 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.4

Dynamic instability of beams subjected to periodic axial forces is studied using the discrete singular convolution (DSC) method with the regularized Shannon’s delta kernel. The principal regions of dynamic instability under different boundary conditions are examined in detail, and the non-stationary vibrations near the stability-instability critical regions have been investigated. It is found that the results obtained by using the DSC method are consistent with the analytical solutions, which shows that the DSC algorithm is suitable for the problems considered in this study. It was found that there is a narrow region of beat vibration existed in the vicinity of one side (θ/Ω > 1) of the boundaries of the instable region for each condition.

Investigation on crystalline structure and dielectric relaxation behaviors of hot pressed poly(vinylidene fluoride) film

Xubo Jiang,Xiaojia Zhao,Guirong Peng,Wenpei Liu,Ke Liu,Zaiji Zhan 한국물리학회 2017 Current Applied Physics Vol.17 No.1

The dielectric relaxation behaviors of hot pressed poly(vinylidene fluoride) (PVDF) film have been studied using dielectric spectroscopy in the frequency domain from 20 Hz to 5 MHz at temperatures between 20 C and 200 C. Crystalline/amorphous interphase is suggested with methods of FTIR, XRD, and DSC. Frequency and temperature dependence of dielectric spectroscopy reveals the relaxation behavior and structural dynamics of the samples, and three types of relaxation processes are suggested, aAc relaxation process contributed by the hopping transport process near the periphery of conduction band or valence zones at Fermi energy, ac relaxation process related to the structure change of crystal lattice trapped dipoles in crystalline regions, and aa relaxation process arising from segmental dipole rearrangement of interphases in amorphous regions. Cole-Cole and Havriliak-Negami experimental equations were utilized to analyze these relaxation processes, and differences of Arrhenius parameters for aAc and ac relaxation processes obtained from Cole-Cole and Havriliak-Negami equations were discussed in detail. Activity energy of different relaxation processes obtained from Arrhenius equation and VFT equation indicates non-single thermal activation mechanism for hot pressed PVDF film. © 2016 Elsevier B.V. All rights

Stability and non-stationary vibration analysis of beams subjected to periodic axial forces using discrete singular convolution

Song, Zhiwei,Li, Wei,Liu, Guirong Techno-Press 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.4

Dynamic instability of beams subjected to periodic axial forces is studied using the discrete singular convolution (DSC) method with the regularized Shannon's delta kernel. The principal regions of dynamic instability under different boundary conditions are examined in detail, and the non-stationary vibrations near the stability-instability critical regions have been investigated. It is found that the results obtained by using the DSC method are consistent with the analytical solutions, which shows that the DSC algorithm is suitable for the problems considered in this study. It was found that there is a narrow region of beat vibration existed in the vicinity of one side (${\theta}/{\Omega}$ > 1) of the boundaries of the instable region for each condition.

Field measurements of wind pressure on an open roof during Typhoons HaiKui and SuLi

Ruoqiang Feng,Fengcheng Liu,Qi Cai,Guirong Yan,Jiabing Leng 한국풍공학회 2018 Wind and Structures, An International Journal (WAS Vol.26 No.1

Full-scale measurements of wind action on the open roof structure of the WuXi grand theater, which is composed of eight large-span free-form leaf-shaped space trusses with the largest span of 76.79 m, were conducted during the passage of Typhoons HaiKui and SuLi. The wind pressure field data were continuously and simultaneously monitored using a wind pressure monitoring system installed on the roof structure during the typhoons. A detailed analysis of the field data was performed to investigate the characteristics of the fluctuating wind pressure on the open roof, such as the wind pressure spectrum, spatial correlation coefficients, peak wind pressures and non-Gaussian wind pressure characteristics, under typhoon conditions. Three classical methods were used to calculate the peak factors of the wind pressure on the open roof, and the suggested design method and peak factors were given. The non-Gaussianity of the wind pressure was discussed in terms of the third and fourth statistical moments of the measured wind pressure, and the corresponding indication of the non-Gaussianity on the open roof was proposed. The result shows that there were large pulses in the time-histories of the measured wind pressure on Roof A2 in the field. The spatial correlation of the wind pressures on roof A2 between the upper surface and lower surface is very weak.When the skewness is larger than 0.3 and the kurtosis is larger than 3.7, the wind pressure time series on roof A2 can be taken as a non-Gaussian distribution, and the other series can be taken as a Gaussian distribution.

한자문화권 행정학의 시작과 초기 연구: 일본·중국·한국의 비교

박흥식 ( Heungsik Park ),毛桂榮 ( Guirong Mao ),刘伟 ( Wei Liu ) 서울대학교 한국행정연구소 2021 行政論叢 Vol.59 No.4

이 연구는 한자문화권 3국(일본, 중국, 한국)의 초기 행정학 성립 과정과 성과에 대한 역사적 분석과 비교, 시사점 제시이다. 크게 세 가지 의문을 다루었다. 첫째, 행정학의 등장 시기는 언제인가? 둘째, 성과는 무엇이었는가? 셋째, 3국간의 차이와 이들이 현대행정에 미친 영향이나 의미는 무엇인가이다. 연구방법은 근대 고문헌(古文獻)의 추적을 통한 검증과 해석이고, 대상은 학회창립 이전까지이다. 검토결과 3국에서 행정학 등장과 시작의 배경(환경), 학문 성격과 내용, 학자(주체), 발전과 지속성, 성과 등에서 큰 차이가 있었다. 일본은 1880년대 후반 독일 국가학(행정학)을, 중국은 1930년대 전후에 일본 행정학과 미국 행정학, 한국은 1950년대 중반에 미국 행정학을 도입한다. 일본과 중국은 쇠퇴나 중단 시기를 거쳐 학회를 창립한다. 반면 한국은 3국 중 가장 늦게 행정학을 도입하지만 미국의 직접적 교육지원을 받으면서 중단이나 재개 없이 단기간에 학회 설립, 본격적 연구도 시작할 수 있었다. 동북아 3국의 행정학 시작은 서구가 발전시킨 학문의 일방적 수입이고, 입헌국가 정치이념과 체제의 도입, 국민 주권적 사고의 채택, 전통적 학문인 유학과의 단절 등을 배경으로 한 것으로, 이 연구는 오늘날 행정학 발전 역사의 복원과 재구성, 정체성과 문화적 적합성 등에 관한 여러 논의 이슈를 제기한다. This study examined the beginning of public administration studies in three East Asian countries―Japan, the People’s Republic of China, and South Korea. Three major questions were addressed: When did the concept of public administration studies first appear? What were the early achievements in this area of study? What are the differences between the three countries in studying public administration? To answer these questions, historical methods were used to trace and interpret past events based on government records and the literature. The period analyzed was until the founding of the society for public administration in each country. The findings are as follows: Japan introduced the German science of state and public administration in the late 1880s, China imported Japanese and American public administration around the 1930s, as South Korea did in the mid 1950s. Japan and China experienced a decline or discontinuation in the studies of public administration during the period analyzed, but South Korea did not while it directly accepting American public administration. The introduction of public administration studies in the three countries transpired in a mostly unilateral way, as the countries were importing Western academic disciplines, and in a process that was accompanied by the adoption of democratic political ideology, a change in the concept of sovereignty, and the abandonment of Confucianism. These results illuminate the historical and intellectual identity of public administration studies and differences between the concept of the study of public administration between Western countries and the three East Asian countries.

한자문화권 ‘행정(行政)’용어의 탄생과 초기 확산

박흥식 ( Park¸ Heungsik ),毛桂榮 ( Mao¸ Guirong ),刘伟 ( Liu¸ Wei ) 한국행정학회 2021 韓國行政學報 Vol.55 No.3

이 연구는 한자문화권 3국(한국, 일본, 중국)에서 ‘행정(行政)’용어의 탄생부터 확산, 정착에 이르는 역사적 과정의 추적과 비교이다. 行政 용어가 어떠한 역사적 배경 하에서, 어떻게 태어났는가는 행정학에서 원초적 의문이다. 크게 다음 세 가지 질문을 다루었다. 첫째, 行政 용어의 등장 시기는 언제인가? 어떻게 태어났는가? 배경이 무엇인가? 무엇의 번역인가? 둘째, 확산과 공식적 채택 과정에서 누가, 어떤 역할을 하였는가? 셋째, 3국간의 차이는 무엇인가? 문헌기반 고증(考證) 방법을 사용하였고, 분석기간은 3국에서 용어의 등장부터 마지막 정착에 이르는 1911년까지이다. 연구결과, public administration의 첫 번역은 行法으로, 1838년 미국 선교사가 처음 싱가포르에서, 이후 중국에서 번역, 소개하였고, 일본은 메이지 원년 1868년 行政으로 개역(改譯)하였다. 이후 行政이 行法을 대체하였다. 용어 확산에는 일본이 중심적 역할을 하였고, 전파의 방향은 ‘일본→중국과 한국’이다. 조선은 중국이나 일본과 달리 行法의 시기가 없고, 制字에 참여도 없었다. 정착 기준을 정부의 용어 채택으로 보면 일본이 메이지 원년으로 가장 빨랐고, 조선은 1895년 갑오개혁, 중국은 1911년 「중화민국 임시정부 조직대강(中華民國臨時政府組織大綱)」이었다. 행정용어 수용은 근대 입헌국가 체제의 도입, 군주주권에서 국민주권적 사고로의 전환을 의미한다. 이 연구에서는 이러한 역사적 사실 확인에 기초하여 행정학과 行政 용어의 보다 나은 이해를 위한 시사점을 논의하였다. The purpose of this study was to identify the origin and trace the early spread of the term ‘行政’ in China, Japan, and South Korea. From a historical perspective, the evolution of the term 行政, which translates to “public administration” in English, is a fundamental question in public administration studies. Three major questions were addressed: First, when did the term 行政 appear, and how was 行政 translated? Second, who played a part in the process of its creation and diffusion? Third, what are the differences between the three countries? A historical approach was used to answer these questions. The period analyzed was until 1911, which is the year in which the last of the three countries officially adopted the term. The findings are as follows: 行法 first appeared in 1838 in Singapore, then in China, and the Meiji government in Japan retranslated “public administration” as 行政 in 1868; 行政 replaced 行法 over time. Japan played a central role in spreading the term 行政 to China and Korea. Unlike China and Japan, South Korea did not have a period of using 行法, nor was it involved in the process to create the term 行政. The term was accepted in 1868 during the Meiji Restoration period in Japan, by the Gabo Reform (甲午改革) in South Korea in 1895, and through the Provisional Government Organization Act (臨時政府組織大綱) in China in 1911. The use of the term 行政 delineates the moment that each of the three countries began to move toward the adoption of a constitutional system, a separation of power, and a shift from a monarchical sovereignty to a people’s sovereignty. These findings have significant implications for our understanding of the term 行政 and the early days of public administration.

Study on the role of gga-miRNA-200a in regulating cell differentiation and proliferation of chicken breast muscle by targeting Grb2

Keren Jiang,Fengbin Yan,Meng Zhang,Fang Li,Donghua Li,Guirong Sun,Xiaojun Liu,Hong Li,Ruili Han,Ruirui Jiang,Zhuanjian Li,Xiangtao Kang 한국통합생물학회 2017 Animal cells and systems Vol.21 No.6

Growth factor receptor-bound protein 2 (Grb2) have been proved by a lot of studies playing a major role in cell proliferation and cell differentiation. However, the regulation of Grb2 expression by microRNAs (miRNAs) in chicken breast muscle still remains unknown. The expression profile of Grb2 was checked based on our previous RNA sequencing data and the Grb2 relative expression level in breast muscle of aged hens (55-week-old) was validated significantly higher than juvenile hens (20-week-old) using qRT-PCR. miRNAs that interact with Grb2 have been predicted in chicken and the relationship between the potential miRNA and Grb2 was verified using dual luciferase reporter assay in chicken DF1 cells. Dual-luciferase reporter assays results demonstrated that the expression of luciferase reporter gene linked with part sequence of the 3′UTR of chicken Grb2 gene was down-regulated by the overexpression of gga (Gallus Gallus)- miR-200a-3p in the DF1 cells, and the down-regulation behavior was abolished when the ggamiR- 200a-3p binding site in 3′UTR of Grb2 was mutated, indicating that gga-miR-200a can suppress the expression level of its target gene Grb2. Therefore, we concluded that the significantly increased expression level of Grb2 in the breast muscle of aged chicken can (at least partly can) be explained by the decreased expression of miR-200a, which reduced the inhibitory effect on Grb2. Taken together, these findings suggest that gga-miR-200a can suppress the expression level of its target gene Grb2 and might be involved in the cell differentiation and proliferation of chicken breast muscle through binding with the 3’UTR of Grb2.