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( Changhong Yan ),( Shulan Guo ),( Jinzhong Tan ),( Yang Liu ),( Baotian Xu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
In recent years, due to the influence of extreme heavy rainfall weather, many large scale landslides occurred on the gentle slopes in Ningzhen area, which characteristically intermittent creep, large scale, and small slip distance (generally less than 30 m). The surface of gentle slope is dominated by fine-grained soil, while the middle and lower layers are dominated by coarse-grained soil, gravel or weathered rockmass, forming a special "binary stratigraphic structure" and the permeability of the soil layer is weak-strong-weak from top to bottom. Under the condition of heavy rainfall weather extremes, the bare rockmass fracture of upper mountain in favor of rainfall infiltration. The middle mountain by precipitation process prone to circular sliding, the lower part of the gentle slope is easy to form “Temporary confined groundwater”, which is prone to landslide under the combined with downslide force of the middle slide body. Based on this new type of landslide geological hazard, the stratum structure and sliding mechanism of the landslide had been researched by using the cybernetics of rockmass structure and preferred plane theory.
Changhong Wang,Shan Qi,Cheng Xie,Chunfu Li,Pu Wang,Dongmei Liu 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.6
Objective: The present study is to evaluate the biological functions of long non-coding RNA (lncRNA), X-inactive specific transcript, X-inactive specific transcript (XIST) in human epithelial ovarian cancer (EOC). Methods: XIST was upregulated in EOC cell lines, CAOV3 and OVCAR3 cells by lentiviral transduction. The effects of XIST overexpression on cancer cell proliferation, invasion, chemosensitivity and in vivo tumor growth were investigated, respectively. Possible sponging interaction between XIST and human microRNA hsa-miR-214-3p was further evaluated. Furthermore, hsa-miR-214-3p was overexpressed in XIST-upregulated CAOV3 and OVCAR3 cells to evaluate its effect on XIST-mediated EOC regulation. Results: Lentivirus-mediated XIST upregulation had significant anticancer effects in CAOV3 and OVCAR3 cells by suppressing cancer cell proliferation, invasion, increasing cisplatin chemosensitivity and inhibiting in vivo tumor growth. Hsa-miR-214-3p was confirmed to directly bind XIST, and inversely downregulated in XIST-upregulated EOC cells. In EOC cells with XIST upregulation, secondary lentiviral transduction successfully upregulated hsa-miR-214-3p expression. Subsequently, hsa-miR-214-3p upregulation functionally reversed the anticancer effects of XIST-upregulation in EOC. Conclusion: Upregulation of lncRNA XIST may suppress EOC development, possibly through sponging effect to induce hsa-miR-214-3p downregulation.
Changhong Zhou,Hongzhi Yue,Yuhua Li,Miaomiao Zhang,Jiayin Liu,Shahroz Aijaz 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.1
The angularity of particles has important effects on the mechanical properties of asphalt mixture and other granular materials. To simulate these effects, the glue-sphere method was usually used to create an arbitrary polyhedron particle. Unlike other studies, this paper aims to efficiently fill a polyhedron with as few spheres as possible through optimization technology in order to reduce the cost of calculation during mixture simulation. Four contents are mainly discussed here: a) how to produce non-spherical aggregates and control their sizes with the minimal bounding box; b) how to fill convex non-spherical particles with the fewest balls as possible using the constrained nonlinear optimization method; c) how to compute the typical shape factors of these particles; and d) how the control parameters affect the filling effect. The algorithm for this study was programmed by MATLAB software and was proven to have better filling performance and less computational cost compared to other methods.
A review of fine structures of nanoporous materials as evidenced by microscopic methods.
Liu, Zheng,Fujita, Nobuhisa,Miyasaka, Keiichi,Han, Lu,Stevens, Sam M,Suga, Mitsuo,Asahina, Shunsuke,Slater, Ben,Xiao, Changhong,Sakamoto, Yasuhiro,Anderson, Michael W,Ryoo, Ryong,Terasaki, Osamu Oxford University Press 2013 Microscopy Vol.62 No.1
<P>This paper reviews diverse capabilities offered by modern electron microscopy techniques in studying fine structures of nanoporous crystals such as zeolites, silica mesoporous crystals, metal organic frameworks and yolk-shell materials. For the case of silica mesoporous crystals, new approaches that have been developed recently to determine the three-dimensionally periodic average structure, e.g., through self-consistent analysis of electron microscope images or through consideration of accidental extinctions, are presented. Various structural deviations in nanoporous materials from their average structures including intergrowth, surface termination, incommensurate modulation, quasicrystal and defects are demonstrated. Ibidem observations of the scanning electron microscope and atomic force microscope give information about the zeolite-crystal-growth mechanism, and an energy for unstitching a building-unit from a crystal surface is directly observed by an anatomic force microscope. It is argued how these observations lead to a deeper understanding of the materials.</P>
A calculation method for finite depth free-surface green function
Liu, Yingyi,Iwashita, Hidetsugu,Hu, Changhong The Society of Naval Architects of Korea 2015 International Journal of Naval Architecture and Oc Vol.7 No.2
An improved boundary element method is presented for numerical analysis of hydrodynamic behavior of marine structures. A new algorithm for numerical solution of the finite depth free-surface Green function in three dimensions is developed based on multiple series representations. The whole range of the key parameter R/h is divided into four regions, within which different representation is used to achieve fast convergence. The well-known epsilon algorithm is also adopted to accelerate the convergence. The critical convergence criteria for each representation are investigated and provided. The proposed method is validated by several well-documented benchmark problems.
白長虹,劉熾 啓明大學校 産業經營硏究所 2002 經營經濟 Vol.35 No.1
충성스런 고객은 기업의 생존과 발전의 기초가 된다. 서비스 산업의 신속한 발전은 업계나 학계에 서비스업계의 고객충성에 대한 정확한 정의나 그 구성요소 및 결정요인 등에 관한 심도 깊은 이해를 요구하고 있다. 본 논문은 서비스업계의 고객충성에 대한 서구학자들의 연구결과들을 분석 정리한 후 직간접적인 영향을 미치는 요인들과 고객가치 개념에 입각한 고객 충성의 인과관계를 살펴보고, 끝으로 고객가치에 기초한 고객충성 관리에 관련된 몇 가지의 제의를 하고자 한다.
Yang Changhong,Meng Lin,Liu Da Gang,Zhang Kaizhi,Liao Shuqing,Dai Zhiyong 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.61
Firstly, the method of combining the finite difference time domain with particle-in-cell code is used for simulating and modeling a accelerated section of the LIA, and on this basis, the numerical simulation of the solenoid coils and steering coils in accelerated section are completed by writing independent calculation module of magnetic components ,then on the platform of the MPICH2 message passing system, a proper method for parallel computing of more accelerate sections is provided and solved LIA's great scale problems. Finally, the 18 accelerated sections was simulated by the software, and compared with the envelope diagram of documents, which proved the correctness of the method used.
A calculation method for finite depth free-surface green function
Yingyi Liu,Hidetsugu Iwashita,Changhong Hu 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.2
An improved boundary element method is presented for numerical analysis of hydrodynamic behavior ofmarine structures. A new algorithm for numerical solution of the finite depth free-surface Green function in threedimensions is developed based on multiple series representations. The whole range of the key parameter R/h is dividedinto four regions, within which different representation is used to achieve fast convergence. The well-known epsilonalgorithm is also adopted to accelerate the convergence. The critical convergence criteria for each representation areinvestigated and provided. The proposed method is validated by several well-documented benchmark problems.
Yingying Liu,Xuena Wei,Feng Chang,Na Yu,Changhong Guo,Hongsheng Cai 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.6
Fusarium root rot is an increasingly severe problem in soybean cultivation. Although several Fusarium species have been reported to infect soybean roots in Heilongjiang province, their frequency and aggressiveness have not been systematically quantified in the region. This study aimed to investigate the diversity and distribution of Fusarium species that cause soybean root rot in Heilongjiang province over two years. A total of 485 isolates belonging to nine Fusarium species were identified, with F. oxysporum and F. solani being the most prevalent. Pot experiments were conducted to examine the relative aggressiveness of different Fusarium species on soybean roots, revealing that F. oxysporum and F. solani were the most aggressive pathogens, causing the most severe root rot symptoms. The study also assessed the susceptibility of different soybean cultivars to Fusarium root rot caused by F. oxysporum and F. solani. The results indicated that the soybean cultivar DN51 exhibited the most resistance to both pathogens, indicating that it may possess genetic traits that make it less susceptible to Fusarium root rot. These findings provide valuable insights into the diversity and distribution of Fusarium species that cause soybean root rot and could facilitate the development of effective management strategies for this disease.