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Lianjin Guo,Guosheng Wang,Xiaoqiong Yu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.1
This paper aims to construct an environmental monitoring system for newly decorated room. Digital temperature-humidity sensors, formaldehyde sensors, benzene sensors, ARM11 and Linux embedded system were selected. According to the application characteristics of the sensors, hardware device drivers were designed, generated kernel module files were loaded into the Linux kernel, and the user application programs operating the sensors’ devices were written. To get accurate measurement and reliable evaluation for environmental condition, a two-level fusion algorithm was designed, which was composed of data-level fusion based on adaptive weighted fusion algorithm and decision-level fusion based on fuzzy set theory and judging principle of composite index. The system was capable of realizing the real-time acquisition and transmission for environmental data. Thus, the indoor environment quality could be accessed conveniently by users via PC terminal on the Internet.
The New Structural Design Process of Supertall Buildings in China
Lianjin, Bao,Jianxing, Chen,Peng, Qian,Yongqinag, Huang,Jun, Tong,Dasui, Wang Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.3
By the end of 2014, the number of completed and under-construction supertall buildings above 250 meters in China reached 90 and 129, respectively. China has become one of the centers of supertall buildings in the world. Supertall buildings in China are getting taller, more slender, and more complex. The structural design of these buildings focuses on the efficiency of lateral resisting systems and the application of energy dissipation. Furthermore, the research, design, and construction of high-performance materials, pile foundations, and mega-members have made a lot of progress. Meanwhile, more and more challenges are presented, such as the improvement of structural system efficiency, the further understanding of failure models, the definition of design criteria, the application of high-performance materials, and construction monitoring. Thus, local structural engineers are playing a more important role in the design of supertall buildings.
Analysis on the Dynamic Characteristics of Cross-Tunnel Structures under Wheel-Rail Impact Forces
Zhigang Wang,Lianjin Tao,Jie Dong 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.9
The dynamic behaviour of cross-tunnel structures under the wheel-rail impact forces of heavyhaultrains is complicated. This paper establishes an impact force excitation input model tosimulate the wheel-rail vertical forces of rail welded joints. The calculated results of thecorrection formula of wheel-rail vertical forces for seamless rail joints are in good agreementwith the measured data and meet the accuracy requirements. The present paper describes a1/50 scale model experiment based on the case of the newly-built Jing-Zhang Railwayunderneath the existing Tang-Hu Heavy Haul Railway. Numerical simulation analysis usesFLAC3D to simulate the experiments and investigate the dynamic soil pressure characteristicsunder different factors. The test and numerical results showed that the dynamic responses ofthe upper tunnel monitoring points are stronger than the lower tunnel, but the maximumvertical settlement of the lower tunnel vault is bigger and prone to damage. As the depthincreases, the stress of the surrounding rock interlayer at each monitoring point graduallydecreases. In-depth, the surrounding rock stress decreased approximately non-linearly withincreasing surrounding rock grade and surrounding rock interlayer thickness.
Study on Structural Efficiency of Super-Tall Buildings
Jianlong, Zhou,Lianjin, Bao,Peng, Qian Council on Tall Building and Urban Habitat Korea 2014 International journal of high-rise buildings Vol.3 No.3
Based on a 405m high super-tall building, the influence of outriggers, different shapes and layouts of structural plane and elevation on structural efficiency under lateral forces is studied in this paper. A calculation formula concerning the structural efficiency is given. The study shows that structural efficiency can be improved by triangulating the plane shape, using mega columns, the peripherization of the plane layout, tapering the elevation shape and setting bracing structure in the elevation. The arrangement of outriggers between the core tube and flange frame can reduce the shear lag effect in order to improve structural efficiency. The essence of improving structural efficiency of super-tall buildings is to maximize the plane bending stiffness and to make its deformation approach to plane section assumption.
Wenwei, Jiang,Qi, Yu,Lianjin, Bao,Mingguo, Liu,Jun, Ji,Dasui, Wang Council on Tall Building and Urban Habitat Korea 2019 International journal of high-rise buildings Vol.8 No.3
Three cases of supertall connected structures are presented and each of them represents a quite style. The first case is a strong-connected structure. The coupling function of towers and connector contributes a lot to the structural stiffness and stability. Its special construction scheme had great impact on the construction quality and the structural safety, and must be accurately considered. For the second case which is a weak-connected structure, the influences of different connecting modes to the structural dynamic characteristic were explained. Then the combined bearings were proposed to achieve the design presume. In the third case which represents the multi-supported structures, the structural distinctive mechanical properties were discussed. For the structural state during construction process is quite different from that in final service condition, two construction procedures were simulated to get an optimal one. Although there are great challenges to designers, the advantages of the supertall connected buildings are obvious. Further work is needed in this area to adapt to the development of future cities.
Fiber-Optic Current Sensor Head Based on the Giant Magnetostrictive Materials
Naikui Ren,Yanling Xiong,Mingze Wu,Yuelan Lv,Lianjin Hong 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.6
A current sensing method based on giant magnetostrictive material (GMM) and fiber Bragg grating (FBG) was proposed, which not only combines the advantages of FBG such as wavelength encoding, compatibility with fiber and distributed measurement system realization, but also the advantages of GMM as large flexible coefficient, high electromechanical coupling coefficient and short response time. The minimal residual method was put forward to effectively identify the Jiles-Atherton model parameters of ferro-magnetic material. The parameters of the giant magnetostrictive ( Terfenol-D bar ) and the Jiles-Atherton model was established and optimized by using the Mathematica software. Then the optical fiber current test system with ferromagnetic loop was set up to investigate the current sensing properties of the sensor. The relationship between current excitation and GMM-FBG reflected wavelength was obtained, which provides basic support for further current sensing experiment research.
Sung Hyun Yoo,김진,Hee-Seung Lee,Jintaek Gong,Lianjin Zhang,Seoneun Jeong 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.11
Coordination polymers from α-amino acids are promising organic–inorganichybrid composites with chirality and biocompatibility. However, coordinationpolymers from unnatural amino acids are rarely studied. Here, we report thetransition metal complexes from an unnatural β-amino acid, (1S,2S)-2-aminocyclopentanecarboxylic acid, affording two possible coordination modesfrom the conformationally rigid cyclopentane ring. X-ray crystallographic analysisrevealed that Zn(II) formed a two-dimensional (2D) coordination polymer viaN,O-bridging mode. In contrast, Cu(II) formed a discrete complex via N,Ochelatingmode and then constructed a 2D supramolecular network stabilizedby hydrogen bonding between water and the ligands.