Study on determination of implementation model in intermodal transportation

Dapeng Liu,Xiamiao Li,Yin Huang,Zhengdong Hu 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10

The determination of implementation model inintermodal transportation is the primary goal of the core transport enterprise. This paper analysis two models in the process of the core transport enterprise to seize market opportunities, and set up model of implementation model by means of NPV. We can get the results that the shorter of the life cycle of the market opportunities, the more earnings the core transport enterprise can get by means of established an intermodal transporation Alliance; if the life cycle of the market opportunities is long enough, the core transport enterprise can get more earnings from take over another enterprises; and longer the life cycle is, the more earning of the core transport enterprise through any way. The empirical analysis verified the conclusion.

Experimental Study on Spall Resistance of Steel‑Fiber Reinforced Concrete Slab Subjected to Explosion

Dapeng Yang,Bei Zhang,Guojun Liu 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.4

Steel-fiber reinforced concrete slabs have good blast and spall resistance. In this study, compression and splitting tensile experiments were carried out to obtain the basic quasi-static mechanical properties of the steel-fiber concrete specimens and the influence of steel-fiber parameters was revealed. In-field explosion experiments were performed to study the dynamic responses and damage modes of the steel-fiber reinforced concrete slabs. Five typical spall damage modes were observed, the distribution law of the spalling fragments was obtained, and the influence of steel-fiber shape, length, length–diameter ratio and volume percentage on the spall performance were revealed. These results will provide a basis for the application of steel-fiber reinforced concrete slabs in protective structures.

Distributed Adaptive Attitude Tracking of Multiple Spacecraft with a Leader of Nonzero Input

Dapeng Yang,Zhen Chen,Xiangdong Liu 제어·로봇·시스템학회 2013 International Journal of Control, Automation, and Vol.11 No.5

This paper considers the distributed attitude tracking problem of multiple spacecraft with a leader whose control input is possibly nonzero, bounded, and not available to any follower. Based on the relative attitudes and angular velocities of neighboring spacecraft, we design a distributed discon-tinuous adaptive controller to each follower to guarantee that the attitude errors between the followers and the leader converge to zero for any communication graph containing a directed spanning tree with the leader as the root. To tackle the chattering effect caused by the discontinuous controller, we further propose a distributed continuous adaptive controller, under which both the attitude tracking errors and the adaptive gains are ultimately bounded.

Combing Customizable Configuration and Interactive Control to Simulate Juicing and Filling Production Line

Changyu Liu,Dapeng Li,Bin Lu,Tiezhu Zhao 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.5

Both the rapid growth of global economy and the rapid improvement in living conditions have witnessed an explosive requirement of foods that are rich of vitamin. Juice beverage, as one kind of these foods, is very popular among people of all ages due to its higher portability and easier preservability. However, there are many issues, such as a very low device utilization rate, a very long design period and an inflexible manufacturing process, by using the traditional juicing and filling production line. The introduction of virtual reality simulation technologies can not only detect bottlenecks of the production line during design period, but also process fruits according to seasons for improving the total efficiency of one single production line. In this paper, we combine customizable configuration and interactive control to design and implement a simulation system of juicing and filling production line based on the traditional client-server architecture. Practical applications show that the developed simulation system can not only shorten effectively the design period but also improve greatly the design quality.

Thermo- and pH-Responsive CeF3 Nanocrystals/HPC–PAA Complex Nanogel and Its Drug Release Behavior

Ben Liu,Qiusheng Song,Qiancheng Zhang,Haihong Ma,Ziwen Zhang,Dapeng Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.8

In this study, a kind of novel rare-earth nanocrystals/hydroxypropylcellulose–poly (acrylic acid) (HPC–PAA) complex fluorescent nanogel, its responsive behavior to environmental temperature and pH value were reported. For preparation, with HPC being used as template, HPC–PAA nanogel was first synthesized by polymerization and crosslinking reaction of acrylic acid (AA) in water solution. In the process, a redox initiator, which composed of ammonium persulfate (APS) and N,N,N′,N′-tetramethylethylenediamine (TEMED), was used to initiate the reaction. Then, the as-prepared nanogel reacted with Ce(NO3)3 and NH4F solution successively, and a novel CeF3 nanocrystals/HPC–PAA complex nanogel was fabricated. The microstructure of the nanogel was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD), Thermogravimetric (TG) and Transmission electron microscopy (TEM). The environmental sensitivity of the nanogel was investigated by photoluminescence (PL) and UV–Visible spectrophotometer (UV–Vis). The thermo- and pH-sensitive fluorescence were studied by PL at various temperatures and pH values; besides, the behavior of drug loading and release was researched by PL with a famous antibiotic of Ibuprofen as model drug. The results show that the PL intensity of the nanogel was largely affected by environmental temperature, or content of Ibuprofen loaded in the nanogel. The as-prepared nanogel can be used as useful sensitive material to detect temperature and pH value change, and drug loading or release property of Ibuprofen can be detected by PL emission of the nanogels conveniently.

Investigation of The Magnetic Properties of Zn₂TiO₄ Single Crystal

Ying Liu,Liang Li,Huamin Yu,Tian Cui,Dapeng Xu 한국자기학회 2019 Journal of Magnetics Vol.24 No.3

The magnetic properties of Zn₂TiO₄ single crystals were investigated by physical property measurement system (PPMS). The field dependent magnetization (M-H) curves showed a weak ferromagnetism at low field and diamagnetism at high field for Zn₂TiO₄ single crystals. The zero-field-cooled (ZFC) and field-cooled (FC) curves further confirmed ferromagnetic behavior of the sample. With the temperature decreasing from 300 to 10 K, the weak ferromagnetism increased slowly. Around 50 K, the M-T curves had a shoulder. After the temperature decreased to 10 K, the ferromagnetism increased significantly. The magnetic mechanism was investigated using the first-principle calculations method. The origin of the ferromagnetic was discussed.

Cleavage Furrow Formation for Avascular Tumor Growth based on Finite Element Modeling

Changyu Liu,Dapeng Li,Bin Lu,Tiezhu Zhao 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.3

A number of studies have shown that the prevention and cure of malignant tumors may become much easier if growth mechanisms, such as the role of cleavage furrow formation in tumor cell division, could be discovered and understood in the earlier avascular phase. Although it is well known that metazoan mitotic spindle which is one of the most important substances during the cytokinesis of a cell division determines the position of the cleavage furrow formation, we are still on the verge of solving the puzzle of what molecules and how they control the formation of the cleavage furrow. In this paper, we propose a cleavage furrow formation approach based on finite element method, which combines nodes selection, mesh partition and matrix assembly in a total energy equation, for modeling the mechanisms of avascular tumor growth. We also perform several experiments. Results show that, by using our proposed approach for the avascular tumor growth, the positions of cleavage furrows are decided not only chemically but also physically and tumor cells are not symmetric, which demonstrates the effectiveness of our proposed approach.

A Fast Clustering Method for Identifying Rock Discontinuity Sets

Feng Gao,Dapeng Chen,Keping Zhou,Wenjing Niu,Hanwen Liu 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.2

Identifying rock discontinuity sets is a major factor for analyses of hydraulic properties and rock mass stability. To perform efficient and precise grouping of discontinuities, a new approach based on clustering by fast searches and finding density peaks is proposed for the identification of rock discontinuity sets. By measuring the similarity of each pair of discontinuities, the local density and controlled distance of each discontinuity can be calculated for a certain cutoff distance. The number of potential clusters and central discontinuities of corresponding clusters can be found by observing the decision graph constructed based on the decision values of all discontinuities in descending order. The discontinuities of each cluster are divided into core discontinuities and outlier discontinuities based on the corresponding boundary density. This strategy can avoid interference from subjective factors and improve the accuracy of the clustering analysis. The new approach is verified using artificial data, and the appropriate cutoff distance thresholds for identifying rock discontinuity sets are given. Finally, the new approach is applied to group discontinuities in an actualunderground mine. The clustering results obtained with the proposed approach are more reliable than those obtained with traditional methods.

Pharmaceutical R&D Project Management under Risk

Yin Huang,Xiamial Li,Dapeng Liu 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10

Market pressure and tough socio-political regulations are among the current factors that are changing the way in which the pharmaceutical business is operated. The pharmaceutical industries and faced with the question of the best use of the limited resources available to obtain the highest possible profit from a potential product portfolio. Pharmaceutical products differ somewhat from other products. In the sense, pharmaceutical R&D project management under risk is crucial for quick responses to changing market trends. For this reason, a great deal of the recent research has focused on the research and development(R&D) projects. This article reviews the current literature in R&D project management under risk for medical and pharmaceutical products., The review discusses some interesting open research questions in this field, and points out new directions for future research.

Radiation shielding optimization design research based on bare-bones particle swarm optimization algorithm

Jichong Lei,Chao Yang,Huajian Zhang,Chengwei Liu,Dapeng Yan,Guanfei Xiao,Zhen He,Zhenping Chen,Tao Yu Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6

In order to further meet the requirements of weight, volume, and dose minimization for new nuclear energy devices, the bare-bones multi-objective particle swarm optimization algorithm is used to automatically and iteratively optimize the design parameters of radiation shielding system material, thickness, and structure. The radiation shielding optimization program based on the bare-bones particle swarm optimization algorithm is developed and coupled into the reactor radiation shielding multi-objective intelligent optimization platform, and the code is verified by using the Savannah benchmark model. The material type and thickness of Savannah model were optimized by using the BBMOPSO algorithm to call the dose calculation code, the integrated optimized data showed that the weight decreased by 78.77%, the volume decreased by 23.10% and the dose rate decreased by 72.41% compared with the initial solution. The results show that the method can get the best radiation shielding solution that meets a lot of different goals. This shows that the method is both effective and feasible, and it makes up for the lack of manual optimization.