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Centrifuge Model Tests and Numerical Simulations of the Landslide Evolution Process
Han-Dong Liu,Jia-Xing Chen,Wen-Xi Han,Ye Wu,Dong-Dong Li 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.6
Centrifuge model tests and numerical simulations were performed to study the landslide evolution process and failure mechanism. A TLJ-500 geotechnical centrifuge was used for the experiments and landslide deformation and stress was monitored using high-precision differential displacement sensors and earth pressure micro-sensors. Discrete element numerical simulations were performed using PFC2D based on the experimental results. The findings show that the landslide evolution process can be divided into three stages: 1) compaction and consolidation; 2) uniform deformation; and 3) accelerated deformation and failure. The numerical simulation results verify the distinct stage characteristics of the landslide evolution process. According to the migration of microscopic soil mass particles within the landslide, stage 3) can be further divided into a deformation development stage and instability and failure stage. The simulation displacement monitoring curves and displacement map show distinct deformation characteristics and displacement indicators from stages 2) to 3) and from the deformation development stage to the instability and failure stage. The experimental and numerical results reveal the landslide failure mechanism: the upper part of the landslide thrusts and slides; the middle part squeezes; the lower part collapses; and shear plane penetration leads to landslide failure.
Deterministic Secure Quantum Communication Without Maximally Entangled States
Xi-Han Li,Fu-Guo Deng,Chun-Yan Li,Hong-Yu Zhou,Ping Zhou,Yu-Jie Liang 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.4
Two deterministic secure quantum communication schemes are proposed, one based on pure entangled states and the other on d-dimensional single-photon states. In these two schemes, only single-photon measurements are required for the two authorized users, which makes the schemes more convenient than others in practical applications. Although each qubit can be read out after a transmission of additional classical bit, it is unnecessary for the users to transmit qubits double the distance between the sender and the receiver, which will increase their bit rate and their security. The parties use decoy photons to check eavesdropping efficiently. The obvious advantage in the first scheme is that the pure entangled source is feasible with present techniques.
한홍석(Han Hong-Xi) 한국문화산업학회 2005 문화산업연구 Vol.5 No.2
This paper tries to investigate a desirable cooperative model between Korean and Chinese enterprises in culture industry, by analyzing an example that the Korean on-line game enterprise had been sold to the Chinese enterprise in 2004. At the beginning of the 2000’s, many Korean on-line game enterprises entered the Chinese market vigorously and cooperated with the Chinese enterprises, reclaiming and developing the huge Chinese network game market. Up to now, the Korean enterprises mainly adopted the method that provides the advanced game products and charges royalty. But, the Chinese market is fast-growing, and the technical catch-up ability of Chinese enterprises is also fast-growing; therefore, the limit of that method is very clear. The most important problem is that Korean enterprises can not attain any gains by Chinese enterprise's growth. This paper insists that not only the cooperation between Korean and Chinese enterprises is important, but also the selection of desirable cooperative model is needed. Korean and Chinese enterprises both need to share profit and risk from market expansion. Also they must pay more attention to expanding the Chinese and world markets than distributing profits. This paper tries to investigate a desirable cooperative model between Korean and Chinese enterprises in culture industry, by analyzing an example that the Korean on-line game enterprise had been sold to the Chinese enterprise in 2004. At the beginning of the 2000’s, many Korean on-line game enterprises entered the Chinese market vigorously and cooperated with the Chinese enterprises, reclaiming and developing the huge Chinese network game market. Up to now, the Korean enterprises mainly adopted the method that provides the advanced game products and charges royalty. But, the Chinese market is fast-growing, and the technical catch-up ability of Chinese enterprises is also fast-growing; therefore, the limit of that method is very clear. The most important problem is that Korean enterprises can not attain any gains by Chinese enterprise's growth. This paper insists that not only the cooperation between Korean and Chinese enterprises is important, but also the selection of desirable cooperative model is needed. Korean and Chinese enterprises both need to share profit and risk from market expansion. Also they must pay more attention to expanding the Chinese and world markets than distributing profits.
Effect of Template Removal on Synthesis of Organic-Inorganic Hybrid Mesoporous MCM-48
Ya Nan Zhao, San Xi Li,Chong Soo Han,San Xi Li 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.10
Post-synthesis is used to synthesize organic hybrid inorganic mesoporous sieves. In this method, the activity and structure of the base sieve are crucial to obtain the definable hybrid materials. The chemical and physical properties of the base can be largely changed either by the final step of its synthesizing processes, by template removal which is accomplished with the oxidative thermal decomposition (burning) method or by solvent extraction method. In this paper we compared two methods for the post-synthesis of organic hybrid MCM-48. When the template was extracted with HCl/alcohol mixture, the final product showed larger pore size, larger pore volume and better crystallinity compared to the case of the thermal decomposition. The reactivity of the surface silanol group of template free MCM-48 was also checked with an alkylsilylation reagent CH2=CHSi(OC2H5)3. Raman and 29Si NMR spectra of MCM-48 in the test reaction indicated that more of the organic group was grafted to the surface of the sample after the template was removed with the solvent extraction method. Direct synthesis of vinyl-MCM-48 was also investigated and its characteristics were compared with the case of post-synthesis. From the results, it was suggested that the structure and chemical reactivity can be maintained in the solvent extraction method and that organic grafting after the solvent extraction can be a good candidate to synthesize a definable hybrid porous material.
Han Hu,Jian Yan,Liyue Zhu,Hong-Sheng Xi 제어·로봇·시스템학회 2012 International Journal of Control, Automation, and Vol.10 No.6
This paper presents a novel Markov switching state space control model for dynamically switching resource configuration scheme to achieve power conservation for multimedia server cluster systems. This model exploits the hierarchical dynamic structure of network system and its construction is flexible and scalable. Using this analytical model, the problem of power conservation is posed as a constrained stochastic optimization problem with the goal of minimizing the average power consump-tion subject to the constraint on the average blocking ratio. Applying Lagrange approach and online estimation of the performance gradient, a policy iteration algorithm is proposed to search the optimal policy online. This algorithm does not depend on any prior knowledge of system parameters, and con-verges to the optimal solution. Simulation results demonstrate the convergence of the proposed algo-rithm and effectiveness to different access workloads.