An Experimental Study on Damage Detection of Structures using a Timber Beam

Jianchun Li,Fook Choon Choi,Bijan Samali,Keith Crews 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.6

单篇幅全本白蛇故事年画的图像和叙事 -从图像与故事互文的角度切入

庞建春 ( Pang Jianchun ) 한국중국어문학회 2019 中國文學 Vol.101 No.-

This paper interprets the story deduction information contained in the Folk-Picture of White Snake Story from the perspective of image and story intertextuality. 6 full-text Folk-pictures of White Snake Story are divided into two categories: Gongjian, and Sancai genres of Folk-Picture have different units and ways of connecting stories. In this way, even if the story is roughly the same, it can bring different “reading” enjoyment. The Sancai of story comic books are practical and relatively close to the Chinese folk rap text. With the help of some scenes, we can judge which kind of story text the original is. However, because White Snake story has a rich form of popular literature, it is very difficult to determine which script the folk painter draws from. The deductive features of Folk-Picture can be interpreted according to some unfamiliar and common plots in the pictures. This paper points out that story Folk-Picture are not simply pictorial texts, but a kind of story telling relying on oral inheritance. For story study, the rich White Snake story Folk-Pictures are a treasury to be developed.

역사 인물의 문화콘텐츠 개발 고찰 - 청대 초기 청백리 우성룡(于成龍) 열풍 사례를 중심으로 -

방건춘 ( Pang Jianchun ) 동아대학교 석당학술원 2018 石堂論叢 Vol.0 No.70

본 논문은 문화가치 개발이라는 시각에서 ‘우성룡 열풍’을 개별 사례로 삼아 당대 중국의 역사인물에 대한 문화콘텐츠 산업 개발 사례를 고찰해 봄으로써 그 가운데에서 관련 경험과 교훈을 얻고자 한다. 전체적으로 우선 시대별로 역사 기록과 문예 창작 두 부분으로 나누어 현재 우성룡 관련 역사 자원과 문예창작의 현황을 살펴보고, 2장, 3장, 4장에서는 각각 문화 파워의 원천, 문화 파워의 재생, 신 문화 파워의 창조라는 시각에서 우성룡 열풍의 형성과정과 여러 창작 방법등의 관계 및 영향, 그리고 중국 산시(山西) 지역에서 우성룡이 인정받게 되는 배경을 살펴본다. 본 논문에서는 역사인물의 원생태적 자료와 그 개발 과정에서 서면문헌 이외에도 구전 자료의 역할이 매우 중요함을 말하고 있다. 이러한 유형의 개발 과정은 중앙정부와 지방정부가 각각 중요한 주도적 역할을 발휘해야 한다. 이 밖에도 현지 대중의 인정과 촉진작용 또한 기층의 원동력이 되고 있다. From the perspective of cultural value development, this paper is in the case of “Yu Chenglong fever”, disuse an example of the development of cultural contents for historical figures in contemporary China. The first part of the paper is divided into two categories: historical records & literary and artistic creations in accordance with the order of the times, and introduces the historical resources and literary works of Yu Chenglong. In the second, third, fourth part from the source of cultural power, the regenerative cultural power and the creation of new cultural power, carding and analysis of the forming process of Yu Chenglong fever, and the relationship between various creative ways, as well as the formation of local identity in the Shanxi area. This paper puts forward that in the primary resources and the operation of historical figures, the role of oral presentation should be paid full attention to in addition to the written literature. In this kind of operation, the central government and the local government have played an important leading role respectively. In addition, the identity and promotion of the local people are the motive force of the more grass-roots level.

The use of Displacement Threshold for Switching Frequency Strategy for Structural Vibration Mitigation

Joko Widjaja,Jianchun Li,Bijan Samali 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.6

Preparation and Characterization of Sisal Fiber-based Activated Carbon by Chemical Activation with Zinc Chloride

Xincheng Lu,Jianchun Jiang,Kang Sun,Xinping Xie 대한화학회 2014 Bulletin of the Korean Chemical Society Vol.35 No.1

Sisal fiber, an agricultural resource abundantly available in china, has been used as raw material to prepare activated carbon with high surface area and huge pore volume by chemical activation with zinc chloride. The orthogonal test was designed to investigate the influence of zinc chloride concentration, impregnation ratio, activation temperature and activation time on preparation of activated carbon. Scanning electron micrograph, Thermo-gravimetric, N 2 -adsorption isotherm, mathematical models such as t-plot, H-K equation, D-R equation and BJH methods were used to characterize the properties of the prepared carbons and the activation mechanism was discussed. The results showed that ZnCl 2 changed the pyrolysis process of sisal fiber. Characteristics of activated carbon are: BET surface area was 1628 m 2 /g, total pore volume was 1.316 m 3 /g and ratio of mesopore volume to total pore volume up to 94.3%. These results suggest that sisal fiber is an attractive source to prepare mesoporous high-capacity activated carbon by chemical activation with zinc chloride.

Semi-active control of smart building-MR damper systems using novel TSK-Inv and max-min algorithms

Mohsen Askari,Jianchun Li,Bijan Samali 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.18 No.5

Two novel semi-active control methods for a seismically excited nonlinear benchmark building equipped with magnetorheological dampers are presented and evaluated in this paper. While a primary controller is designed to estimate the optimal control force of a magnetorheological (MR) damper, the required voltage input for the damper to produce such desired control force is achieved using two different methods. The first technique uses an optimal compact Takagi-Sugeno-Kang (TSK) fuzzy inverse model of MR damper to predict the required voltage to actuate the MR dampers (TSKFInv). The other voltage regulator introduced here works based on the maximum and minimum capacities of MR damper at each time-step (MaxMin). Both semi-active algorithms developed here, use acceleration feedback only. The results demonstrate that both TSKFInv and MaxMin algorithms are quite effective in seismic response reduction for wide range of motions from moderate to severe seismic events, compared with the passive systems and performs better than original and Modified clipped optimal controller systems, known as COC and MCOC.

Overview of the development of smart base isolation system featuring magnetorheological elastomer

Yancheng Li,Jianchun Li 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.1

Despite its success and wide application, base isolation system has been challenged for its passive nature, i.e., incapable of working with versatile external loadings. This is particularly exaggerated during near-source earthquakes and earthquakes with dominate low-frequency components. To address this issue, many efforts have been explored, including active base isolation system and hybrid base isolation system (with added controllable damping). Active base isolation system requires extra energy input which is not economical and the power supply may not be available during earthquakes. Although with tunable energy dissipation ability, hybrid base isolation systems are not able to alter its fundamental natural frequency to cope with varying external loadings. This paper reports an overview of new adventure with aim to develop adaptive base isolation system with controllable stiffness (thus adaptive natural frequency). With assistance of the feedback control system and the use of smart material technology, the proposed smart base isolation system is able to realize real-time decoupling of external loading and hence provides effective seismic protection against different types of earthquakes.

Coal and gas outburst hazards and factors of the No. B-1 Coalbed, Henan, China

Liang Chen,Enyuan Wang,Jianchun Ou,Jiangwei Fu 한국지질과학협의회 2018 Geosciences Journal Vol.22 No.1

Coal and gas outburst disaster of the No. B-1 Coalbed, Henan, China, have lasted for nearly 60 years, and the threat will become more and more serious as mining depths continuously increase. However, coal and gas outburst characteristics and factors of the coalbed have not been studied in detail. To effectively prevent and control coal and gas outburst, we analyzed the type, intensity, location and precursors of coal and gas outburst occurring in the No. B-1 Coalbed. Moreover, the effects of geological conditions (burial depth, faults, folds, coalbed thickness and dip) and mining disturbances on coal and gas outburst were studied. The results showed that these outburst accidents were mostly typical, small-sized and medium-sized outburst, which mainly occurred at the coal roadway working faces. There were many precursors such as blasting sound, changes in coal structure, and abnormal gas emission prior to the accidents. Within a burial depth of 500 m, the average outburst intensity had a stronger correlation with the burial depth, which was more obvious at a burial depth of 301~400 m, and less obvious at a burial depth of 401~500 m. However, the distribution of these outbursts barely changed within the burial depth. Up to 99.15% of coal and gas outburst occurred at faults, folds, and areas with changes in coalbed thickness and dip. Up to 68.25% were induced by blasting and 18.04% occurred during shelving, coal-shoveling and no operation. The No. B-1 Coalbed was characterized by delayed outbursts. Moreover, specific suggestions were recommended for the prevention and control of coal and gas outburst. The study is useful to government regulators and staffs engaged in the prevention and control of coal and gas outburst.

Development and application of a UPLC method for studying infl uence of phenological stage on chemical composition of Scutellariae Radix

Hua Li,Hongjing Dong,Jianchun Su,Bin Yang 대한약학회 2021 Archives of Pharmacal Research Vol.44 No.9

The influence of phenological stages onchemical composition of Scutellariae Radix (SR), theroot of Scutellaria baicalensis Georgi, was investigated. In order to deal with a large quantity of samples, arapid ultra-performance liquid chromatographic (UPLC)was first developed and validated for the simultaneousquantification of five flavonoids, namely baicalin(baicalein-7-O-b-D-glucuronide, BG), wogonoside(wogonin-7-O-b-D-glucuronide, WG), baicalein (BA),wogonin (WO), oroxylin A (OA) in the samples. Goodlinearity was obtained in the range of 0.742–389 ng(r2[0.9999) and satisfactory recoveries were obtained(101.72–104.56 %) with the RSD value below 5.0 %,for all analytes. Also, extraction conditions were optimizedto obtain maximum extractive contents of thefive flavonoids. Content variations of the five activeingredients in 225 samples from three different originswere investigated in five major phenological periods. Itwas found that the effect of phenology on the contentsof the tested five flavonoids was similar in the threeorigins. The contents of flavone O-glycosides, i.e., BGand WG accumulated to the highest level in leafexpansion period, while flavonoid aglycones, i.e., BA, WO and OA appeared a maximum concentration inflowering period. The UPLC method established in thisstudy was rapid and of good accuracy, repeatability andresolution, and hence can assist in the quality control ofSR.

Theoretic Analysis on the Manufacture of Blended Yarn by One Spinneret

Wang, Ni,Zhang, Jianchun,Lai, Kan,Sun, Run-Jun The Korean Fiber Society 2007 Fibers and polymers Vol.8 No.3

The possibility of producing blended yam by using one spinneret is analyzed theoretically, especially the formation of differences in linear density and shrinkage between the monofils. Under the same spinning pressure, the die-spinning nozzles with different diameters are used to produce the differences in the flow of the melt. According to the hagen-poseuille equation for streamline flow in cylinder pipe, the volumetric flow rate and the mean melt speed of die-spinning nozzles increase with the increase of diameters. Under the conditions that the winding speeds are the same, so that the effective draw ratios decrease with the increase of the die-spinning nozzles diameters. Then, the filament formed through the die-spinning nozzle with large diameter is coarse and have a low birefringence. On the contrary, the filament formed through the die-spinning nozzle with small diameter is fine and have a high birefringence. The differences between the filament in structure and property could be acquired by one spinneret.