Variations of Earth Magnetic Field Intensity for the Past 5 Myr Derived From Marine Magnetic Anomalies in a Slow-to-Intermediate Spreading South Atlantic Ridge

Li, Yuanjie,Liu, QingSong,Wei, Dongping,Li, Sanzhong,Yu, Yongjae American Geophysical Union 2018 Journal of Geophysical Research: Solid Earth Vol.123 No.9

Biochemical Adaptation to the Freezing Environment - the Biology of Fish Antifreeze Proteins

Li, Zhengjun,Li, n Qingsong,Low Woon-Kai,Miao Megan,Hew Choy L. Korea Institute of Ocean ScienceTechnology 2003 Ocean and Polar Research Vol.25 No.4

Many organisms are known to survive in icy environments. These include both over wintering terrestrial insects and plants as well the marine fish inhabiting high latitudes. The adaptation of these organisms is both a fascinating and important topic in biology. Marine teleosts in particular, can encounter ice-laden seawater that is approximately $1^{\circ}C$ colder than the colligative freezing point of their body fluids. These animals produce a unique group of proteins, the antifreeze proteins (AFPs) or antifreeze glycoproteins (AFGPs) that absorb the ice nuclei and prevent ice crystal growth. Presently, there are at least four different AFP types and one AFGP type that are isolated from a wide variety of fish. Despite their functional similarity, there is no apparent common protein homology or ice-binding motifs among these proteins, except that the surface-surface complementarity between the protein and ice are important for binding. The remarkable diversity of these proteins and their odd phylogenetic distribution would suggest that these proteins might have evolved recently in response to sea level glaciations just 1-2 million years ago in the northern hemisphere and 10-30 million years ago around Antarctica. Winter flounder, Pleuronectes americanus, has been used as a popular model to study the regulation of AFP gene expression. It has a built-in annual cycle of AFP expression controlled negatively by the growth hormone. The signal transduction pathways, transcription factors and promoter elements involved in this process have been studied in our laboratory and these studies will be presented.

Tourism Planning Platform Based on Big Data

李林(Li Lin),汪资,蕾,(Wang Zilei),黄,政霖(Huang Zhenglin),高雅(GaoYa),唐榕(Tang Rong),李青,嵩(Li Qingsong) 아시아사회과학학회 2021 International Science Research Vol.1 No.1

Due to the rapid development of economy, tourism has become a hot activity at present, and tourism planning has become an important planning. However, ordinary travel plans can no longer meet people s needs, and the travel plan platform based on big data can recommend travel routes and travel plans that users are interested in according to users browsing and their own relevant information, so as to reduce users travel troubles.

Biochemical Adaptation to the Freezing Environment - the Biology of Fish Antifreeze Proteins

Zhengjun Li,Qingsong Lin,Woon-Kai Low,Megan Miao,Choy L. Hew 한국해양과학기술원 2003 Ocean and Polar Research Vol.25 No.3s

Many organisms are known to survive in icy environments. These include both over wintering terrestrial insects and plants as well the marine fish inhabiting high latitudes. The adaptation of these organisms is both a fascinating and important topic in biology. Marine teleosts in particular, can encounter ice-laden seawater that is approximately 1oC colder than the colligative freezing point of their body fluids. These animals produce a unique group of proteins, the antifreeze proteins (AFPs) or antifreeze glycoproteins (AFGPs) that absorb the ice nuclei and prevent ice crystal growth. Presently, there are at least four different AFP types and one AFGP type that are isolated from a wide variety of fish. Despite their functional similarity, there is no apparent common protein homology or ice-binding motifs among these proteins, except that the surface-surface complementarity between the protein and ice are important for binding. The remarkable diversity of these proteins and their odd phylogenetic distribution would suggest that these proteins might have evolved recently in response to sea level glaciations just 1-2 million years ago in the northern hemisphere and 10-30 million years ago around Antarctica. Winter flounder, Pleuronectes americanus, has been used as a popular model to study the regulation of AFP gene expression. It has a built-in annual cycle of AFP expression controlled negatively by the growth hormone. The signal transduction pathways, transcription factors and promoter elements involved in this process have been studied in our laboratory and these studies will be presented.

Environment-dependent Broadband Perfect Absorption of Metal-insulator-metal Metamaterial Systems

Feng Li,Yulong Tang,Qingsong Peng,Guosheng Hu 한국광학회 2023 Current Optics and Photonics Vol.7 No.2

Based on calculations using the macroscopic Maxwell’s equations with mesoscopic boundary conditions, light absorption by a layered metal-insulator-metal (MIM) metamaterial system embedded in three different environments is investigated. Increasing the top metal thickness shifts the broad absorption band to lower dielectric-constant regions and longer wavelengths, for either TM or TE waves. Boosting the dielectric-layer thickness redshifts the broadband absorption to regions of larger dielectric constant. In air, for the dielectric-constant range of 0.86–3.40, the absorption of the system exceeds 98% across680–1,033 nm. In seawater with optimized dielectric constant, ≥94% light absorption over 400–1,200nm can be achieved; particularly in the wavelength range of 480–960 nm and dielectric-constant range of 0.82–3.50, the absorption is greater than 98%. In an environment with even higher refractive index(1.74), ≥98% light absorption over 400–1,200 nm can be achieved, giving better performance. Theinfluence of angle of incidence on light absorption of the MIM system is also analyzed, and the angle tolerance for ≥90% broadband absorption of a TM wave is up to 40° in an environment with large re-fractive index. While the incident-angle dependence of the absorption of a TE wave is nearly the same for different circumstances, the situation is different for a TM wave.

A Self-adaptive Workload Balancing Algorithm on GPU Clusters

Jianjiang Li,Yajun Liu,Peng Zhang,Qingsong Miao,Lei Zhang,Wei Chen 보안공학연구지원센터 2016 International Journal of Grid and Distributed Comp Vol.9 No.11

With the wide application of GPU in High Performance Computing, more and more heterogeneous CPU+GPU clusters have been establishedin many fields. But with the comprehensive using of heterogeneous CPU+GPU clusters, workload balancing has become an important problem when the process nodes coordinate with each other, and the execution time of a program on imbalanced clusters resides on the slowest node. Although there are many strategies and algorithms that can solve the problem of workload balancing to some extent, they generally face the problem of high consumption of communication caused by the task migration. In order to make up for the existing deficiencies, this paper proposes a virtual task migration algorithm adapted to GPU clusters on CUDA platform. This algorithm uses virtual task migration to avoid actual data transmission between nodes, so the communication overhead is obviously decreased. At last, this paper performs an actual test using matrix multiplication to verify this algorithm. The experiment results show that compared with static task partitioning, the algorithm proposed in this paper can effectively achieve dynamic workload balancing and reduce the execution time of programs on GPU clusters, thus the algorithm can significantly improve program execution performance of GPU clusters on CUDA platform.

The Information Diffusion Model Based on the Different Information Value Evaluated by Social Network Users

Sun Qingsong,Li Ying 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10

We subdivide social network user’s state to four kinds, Unknown state, Known state, Informed state,refractorystate.Different users may have different judgment for th same information, they transmit the information to their friends in social network lie on the information value and compare with the information threshold, we think unknown users in social network have different thresholds of an information value and sub divide these users to i class, and assume accumulated information valueof users follow uniform distribution. Apply mean field theory to build the diffusion model,from the number of refractory nodes, we can know the diffusion effect of an information in asocial network.

S-I model of horizontal jet grouting reinforcement for soft soil

Zhang, Ning,Li, Zhongyin,Ma, Qingsong,Ma, Tianchi,Niu, Xiaodong,Liu, Xixi,Feng, Tao Techno-Press 2018 Geomechanics & engineering Vol.15 No.5

A superposition-iteration (S-I) model is proposed to simulate the jet grouting pre-reinforcing impact for a shallow-buried tunnel. The common model is deduced by theoretical (force equilibrium) analysis and then transformed into the numerical formulation. After applying it to an actual engineering problem, the most obvious deficiency was found to be continuous error accumulation, even when the parameters change slightly. In order to address this problem, a superposition-iteration model is developed based on the basic assumption and superposition theory. First, the additional deflection between two successive excavation steps is determined. This is caused by the disappearance of the supporting force in the excavated zone and the soil pressure in the disturbed zone. Consequently, the final deflection can be obtained by repeatedly superposing the additional deflection to the initial deflection in the previous steps. The analytical solution is then determined with the boundary conditions. The superposition-iteration model is thus established. This model was then applied and found to be suitable for real-life engineering applications. During the calculation, the error induced by the ill-conditioned problem of the matrix is easily addressed. The precision of this model is greater compared to previous models. The sensitivity factors and their impact are determined through this superposition-iteration model.

An elasto-plastic damage constitutive model for jointed rock mass with an application

Wang, Hanpeng,Li, Yong,Li, Shucai,Zhang, Qingsong,Liu, Jian Techno-Press 2016 Geomechanics & engineering Vol.11 No.1

A forked tunnel, as a special complicated underground structure, is composed of big-arch tunnel, multi-arch tunnel, neighborhood tunnels and separate tunnels according to the different distances between two separate tunnels. Due to the complicated process of design and construction, surrounding jointed rock mass stability of the big-arch tunnel which belongs to the forked tunnel during excavation is a hot issue that needs special attentions. In this paper, an elasto-plastic damage constitutive model for jointed rock mass is proposed based on the coupling method considering elasto-plastic and damage theories, and the irreversible thermodynamics theory. Based on this elasto-plastic damage constitutive model, a three dimensional elasto-plastic damage finite element code (D-FEM) is implemented using Visual Fortran language, which can numerically simulate the whole excavation process of underground project and perform the structural stability of the surrounding rock mass. Comparing with a popular commercial computer code, three dimensional fast Lagrangian analysis of continua (FLAC3D), this D-FEM has advantages in terms of rapid computing process, element grouping function and providing more material models. After that, FLAC3D and D-FEM are simultaneously used to perform the structural stability analysis of the surrounding rock mass in the forked tunnel considering three different computing schemes. The final numerical results behave almost consistent using both FLAC3D and D-FEM. But from the point of numerically obtained damage softening areas, the numerical results obtained by D-FEM more closely approach the practical behaviors of in-situ surrounding rock mass.

The characteristics of abnormal gas emission in tunneling through the small fault groups of Yizhong coal mine

Shu Ma,Qingsong Li,Zhenli Han,Pengxiang Zhang,Furu Kang 한국자원공학회 2016 Geosystem engineering Vol.19 No.5

In light of the complex tectonic structure, and large quantities of buried faults in Yizhong coal mine, the paper, on the basis of analyzing the characteristics of abnormal gas emission caused by production factors such as tunneling and blasting technologies, blasting strength, and tunneling rate, investigates the characteristics of abnormal gas emission in the context of diversified combinations of faults in tunneling through the fault groups in Yizhong coal mine. The study demonstrates the maximum absolute gas emission rate under the procedure of blasting in Yizhong coal mine is approximately 5 times higher than under other procedures, and generally returns to its normal level in 30–40 min; the tunneling rate and blasting strength are in direct proportion to absolute gas emission rate, and the mined coal surpassing 18 tons an hour for a time can cause the risk of gas concentration in return air exceeding limits; in tunneling through the small fault groups, the group largely embodies the influences of individual faults on gas emission, and it is easy to form a space sealed with gas between two sealing faults, where the gas emission intensity and its influence sphere are far greater than separate small faults.