Welcome the Challenges and Imaging the Sky Town

Cheng, Jiang Huan Council on Tall Building and Urban Habitat Korea 2017 International journal of high-rise buildings Vol.6 No.3

Safety, livability, and efficiency are the three prominent problems of tall buildings, which are also the severe challenges to designers. We proposed the idea of building the sky town to solve these problems, which can be summarized in two sentences, one is tall building multi-storised, and another one is vertical facilities municipal-infrastructurised. The tall building can be horizontally cut into several multi-storey buildings by some large platforms. The platform extends a certain width to block the fire from spreading. Tall buildings are connected together as a group. One of them is a traffic core, which is used for vertical transportation and MEP. It connects to traffic center such as metro, while most of the other tall buildings' cores can be very much released, so as to achieve maximum efficiency of floor usable area and to give good traffic organization. By combining traffic core, platforms, and multi-storey buildings' inner traffic, a transportation network is formed. Finally, we refer to the design of Raffles City Chongqing to make a sketch of sky town.

Probabilistic determination of initial cable forces of cable-stayed bridges under dead loads

Cheng, Jin,Xiao, Ru-Cheng,Jiang, Jian-Jing Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.17 No.2

This paper presents an improved Monte Carlo simulation for the probabilistic determination of initial cable forces of cable-stayed bridges under dead loads using the response surfaces method. A response surface (i.e. a quadratic response surface without cross-terms) is used to approximate structural response. The use of the response surface eliminates the need to perform a deterministic analysis in each simulation loop. In addition, use of the response surface requires fewer simulation loops than conventional Monte Carlo simulation. Thereby, the computation time is saved significantly. The statistics (e.g. mean value, standard deviation) of the structural response are calculated through conventional Monte Carlo simulation method. By using Monte Carlo simulation, it is possible to use the existing deterministic finite element code without modifying it. Probabilistic analysis of a truss demonstrates the proposed method' efficiency and accuracy; probabilistic determination of initial cable forces of a cable-stayed bridge under dead loads verifies the method's applicability.

Stability and electronic properties of CuAlO2 (112 0) surfaces

Cheng-Lu Jiang,Qi-Jun Liu,Fu-Sheng Liu,Zheng-Tang Liu 한국물리학회 2017 Current Applied Physics Vol.17 No.2

We have studied the stability and electronic properties of CuAlO2 ð112 『 0Þ surfaces using the firstprinciples calculations. The structural parameters, band structures, surface energies, work functions, densities of states and charge densities of CuAlO2 ð112 『 0Þ surfaces have been investigated. The calculated results show that five layers are needed to maintain convergence. After the formation of surfaces, the bandgaps of stable surfaces decrease, the covalency between Cu and O atoms in surfaces increases, and the positive charge layer in the fisrt layer appears.

Exploring computer vision and artificial intelligence-based distance measurement tools for the standing long jump

Cheng Jiang(강성),Jia-Qi Sun(손가기),Ke-Xin Qi(기가심),Xue Jiang(강설),Xiangchuan Jin(김향천),Xuanshang Jin(김현상) 한국체육측정평가학회 2022 한국체육측정평가학회지 Vol.24 No.1

이 연구에서 제자리 멀리뛰기의 측정 범위에 대한 핵심 기술은 주로 두 가지의 단계를 거친다. 첫 번째 단계는 환경 초기화 단계로, 주로 제자리 멀리뛰기의 필드, 카메라 및 인체의 핵심 지점의 정량적 식별을 포함한다. 두 번째 단계는 범위 설정 단계로 카메라의 점프 프레임과 착지 프레임의 적정 세트를 추출하고 발가락과 발뒤꿈치 영역 또는 범위의 핵심 포인트를 식별하는 것으로 구성된다. 이 연구의 목적을 달성하기 위해서 총 20회의 제자리 멀리 뛰기 동작을 측정하였으며 정확도를 평가한 결과 측정 오차는 0.58cm, 표준편차는 0.24로 나타났다. 따라서 이 연구는 제자리 멀리뛰기 동작의 결과에 대한 오차를 1㎝ 이내로 조절할 수 있다는 것이 입증되었으며, 이는 곧 높은 정확도를 지닌 도구로서 판단된다. 또한 이 연구는 일반적인 웹캠을 사용하기 때문에 다른 제자리 멀리뛰기 검사 방식에 비해 장비의 가격이 저렴하고, 유지비용 또한 부담을 덜어줌과 동시에 높은 지능을 가지고 있는 도구라는 장점이 있다. 따라서 이 연구 결과를 통해 널리 보급되는 것을 기대할 수 있다. The key technology of standing long jump ranging in this study are mainly manifested in two stages: the first stage is the environment initialization stage, which mainly includes the quantitative identification of standing long jump field, camera and human body key points; the second stage is the ranging stage, which consists of extracting the set of jump frame and landing frame and identifying the key points of toe and heel. After the evaluation of test accuracy, the measurement is conducted 20 times, the error is 0.58cm, and the standard deviation is 0.24. It is proved that this study can control the error of standing long jump test results within 1cm, which shows that the research results have high test accuracy. Because this study uses an ordinary webcam, compared with other standing long jump test methods, it has the advantages of higher intelligence, low price and low maintenance cost. The research results are easy to be widely popularized.

Two New Phenolic Glycosides from Hypoxis aurea Lour

Cheng, Zhong-Quan,Yang, Dan,Liu, Yu-Qing,Hu, Jiang-Miao,Jiang, He-Zhong,Wang, Peng-Cheng,Li, Ning,Zhou, Jun,Zhao, You-Xing Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.10

Construction and Differential Screening of a cDNA Library Specific to Osmotic Stress of Haloxylon ammodendron Seedlings

Jiang, Xiao-Cheng,Guo, Xin-Hong,Pan, Xiao-Ling,Song, Song-Quan Korean Society for Biochemistry and Molecular Biol 2004 Journal of biochemistry and molecular biology Vol.37 No.5

A subtracted cDNA library specific to osmotic stress of Haloxylon ammodendron (Mey.) Bge seedlings was constructed by suppression subtractive hybridization (SSH) and T/A cloning. SSH was performed between two groups of H. ammodendron seedlings, one was cultivated in Hoagland (H) solution as a driver and the other group was treated with osmotic stress of the Hoagland solution by the addition of 400 mM mannitol (M), as a tester. The library consisted of about 400 recombinant clones, with the average size being of 500 bp, ranging from 300 bp to 1500 bp. Using a PCR-select differential screening kit, 100 recombinant clones were randomly chosen from the subtracted cDNA library and hybridized with forward,reverse subtracted and unsubtracted probes for two rounds. As a result, 21 positive clones specific to osmotic stress were obtained and some of them were verified by Northern blot analysis. The sequencing analysis of 6 positive clones and the following homology comparison to GenBank [blastx] non-redundant databases characterized that two sequences obtained in this experiment may contribute to novel drought-related genes.

Optimal Design and Dynamic Control of Construction Dewatering with the Consideration of Dewatering Process

Cheng-hua Shi,Cheng-yong Cao,Ming-feng Lei,Li-min Peng,Jing Jiang 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.4

Design optimization of construction dewatering has important values in protecting the surrounding environment and reducing the engineering cost. The existing dewatering design methods are mostly based on the optimization of pumping rate needed to maintain a stable water level, while the drop and rise of water level are not considered in the estimation of pumping rate and dewatering time. The dynamics process of construction dewatering is taken into account in this article. The method for calculating the total water yield and dewatering time from the initial groundwater level to the target water level is established. Then, the design optimization of well group dewatering is provided with the consideration of total water yield and dewatering time in dynamic dewatering process. Finally, the method for the calculation of total water yield and dewatering time when dewatering regions change is derived. The proposed method can realize design optimization and dynamic control of dewatering as the dewatering regions and water level changes in construction. The reliability of this method is verified in on-site engineering applications.

Improved kinetics of LiNi_1/3Mn_1/3Co_1/3O₂ cathode material through reduced graphene oxide networks

Jiang, Ke-Cheng,Xin, Sen,Lee, Jong-Sook,Kim, Jaekook,Xiao, Xiao-Ling,Guo, Yu-Guo The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.8

<P>An electronically conducting 3D network of reduced graphene oxide (RGO) was introduced into LiNi<SUB>1/3</SUB>Mn<SUB>1/3</SUB>Co<SUB>1/3</SUB>O<SUB>2</SUB> (LNMC) cathode material in a special nano/micro hierarchical structure. The rate test and cycling measurement showed that the hierarchical networks remarkably improve the high rate performance of LNMC electrode for lithium-ion batteries. The effect of RGO conducting networks on kinetic property was investigated by electrochemical impedance spectroscopy (EIS) and potentiostatic intermittent titration (PITT). The EIS results reveal that the RGO network greatly decreases the resistance of lithium batteries, especially the charge transfer resistance which can be attributed to the significantly improved conducting networks. The enhancement of apparent diffusion coefficient by the RGO conducting networks is shown by PITT. The power performance was found to be limited by the electrical conduction in the two-phase region, which can be greatly facilitated by the hierarchical RGO network together with carbon black. The as-obtained LNMC/RGO cathode exhibits an outstanding electrochemical property supporting the design idea of electronically conducting 3D networks for the high-energy and high-power lithium-ion batteries.</P> <P>Graphic Abstract</P><P>A 3D conducting network of reduced graphene oxide nanosheets is introduced into LiNi<SUB>1/3</SUB>Mn<SUB>1/3</SUB>Co<SUB>1/3</SUB>O<SUB>2</SUB> and is found to significantly promote the kinetics for Li storage. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp23363k'> </P>

Superior Hybrid Cathode Material Containing Lithium-Excess Layered Material and Graphene for Lithium-Ion Batteries

Jiang, Ke-Cheng,Wu, Xing-Long,Yin, Ya-Xia,Lee, Jong-Sook,Kim, Jaekook,Guo, Yu-Guo American Chemical Society 2012 ACS APPLIED MATERIALS & INTERFACES Vol.4 No.9

<P>Graphene-wrapped lithium-excess layered hybrid materials (Li<SUB>2</SUB>MnO<SUB>3</SUB>·LiMO<SUB>2</SUB>, M = Mn, Ni, Co, hereafter abbreviated as LMNCO) have been synthesized and investigated as cathode materials for lithium-ion batteries. Cyclic voltammetry measurement shows a significant reduction of the reaction overpotential in benefit of the graphene conducting framework. The electrochemical impedance spectroscopy results reveal that the graphene can greatly reduce the cell resistance, especially the charge transfer resistance. Our investigation demonstrates that the graphene conducting framework can efficiently alleviate the polarization of pristine LMNCO material leading to an outstanding enhancement in cell performance and cycling stability. The superior electrochemical properties support the fine hybrid structure design by enwrapping active materials in graphene nanosheets for high-capacity and high-rate cathode materials.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2012/aamick.2012.4.issue-9/am301202a/production/images/medium/am-2012-01202a_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am301202a'>ACS Electronic Supporting Info</A></P>

The Application of E / R Model Theory

Jiang Feng Cheng,Qin Guo Dong,Xuan Zhong Wu 대한전자공학회 1995 ICEIC:International Conference on Electronics, Inf Vol.1 No.1