Optimal Inner Case Design for Refrigerator by Utilizing Artificial Neural Networks and Genetic Algorithm

JianGuang Zhai,Jong-Rae Cho,Min-Shik Roh 한국마린엔지니어링학회 2010 한국마린엔지니어링학회지 Vol.34 No.7

Study on complex flow law near polymer flooding wellbores and adaptability evaluation of shaped charges

Jianguang Wei,Xidong Ren,Hongyan Shao,Yuanyuan Ma,Xuemei Liu,Xuesong Lin 한국자원공학회 2016 Geosystem engineering Vol.19 No.5

The flow law near polymer flooding wellbores under the condition of perforation is very complex and there are many types of shaped charges. In this study, a non-Darcy flow model near polymer flooding wellbores was given, and a flow experiment was carried out to measure the resistance coefficient, residual resistance coefficient, and flow viscosity of the polymer solution in porous media under the conditions of different permeability and different polymer molecular weight. According to the results of numerical simulation, this paper calculated the flow efficiency of different types of shaped charges and evaluated the adaptability of different charges under polymer flooding condition. The results of this study have an important significance for guiding the optimization of shaped charges and the optimization design of perforating parameters.

Fatigue optimization with combined ensembles of surrogate modeling for a truck cab

Jianguang Fang,Yunkai Gao,Guangyong Sun,Chengmin Xu,Qing Li 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11

In this study, we propose the ensembles of surrogates for an industrial application of fatigue optimization problem that aims to maximizea truck cab’s fatigue life. After validating the numerical model, different ensembles of surrogates comprised polynomial responsesurface (PRS), radial basis function (RBF) and Kriging (KRG) models are established to approximate the fatigue life function. A hybridPSO algorithm, which integrates the standard PSO with sequential quadratic programming (SQP), is implemented here to seek a quasiglobaloptimum. Compared with individual surrogates, the ensembles of surrogates can attain more competent optima and yield a smallersurrogate error at the optimal point. Moreover, the hybrid PSO technique proves to search the better optima than the standard PSO in thefatigue optimization problem considered. Finally, it is found that a more accurate surrogate model may not necessarily produce a betteroptimum for the ensembles of surrogates, thus multiple ensembles are recommended without increasing much extra computational cost.

A SMOOTHING NEWTON METHOD FOR NCP BASED ON A NEW CLASS OF SMOOTHING FUNCTIONS

Jianguang Zhu,Binbin Hao 한국전산응용수학회 2014 Journal of applied mathematics & informatics Vol.32 No.1

A new class of smoothing functions is introduced in this pa- per, which includes some important smoothing complementarity functions as its special cases. Based on this new smoothing function, we proposed a smoothing Newton method. Our algorithm needs only to solve one linear system of equations. Without requiring the nonemptyness and bounded- ness of the solution set, the proposed algorithm is proved to be globally convergent. Numerical results indicate that the smoothing Newton method based on the new proposed class of smoothing functions with θ∊(0,1) seems to have better numerical performance than those based on some other important smoothing functions, which also demonstrate that our al- gorithm is promising.

Optimization of Tree-like Core Overlay in Hybrid-structured Application-layer Multicast

( Jianguang Weng ),( Xuelan Zou ),( Minhong Wang ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.12

The tree topology in multicast systems has high transmission efficiency, low latency, but poor resilience to node failures. In our work, some nodes are selected as backbone nodes to construct a tree-like core overlay. Backbone nodes are reliable enough and have strong upload capacity as well, which is helpful to overcome the shortcomings of tree topology. The core overlay is organized into a spanning tree while the whole overlay is of mesh-like topology. This paper focuses on improving the performance of the application-layer multicast overlay by optimizing the core overlay which is periodically adjusted with the proposed optimization algorithm. Our approach is to construct the overlay tree based on the out-degree weighted reliability where the reliability of a node is weighted by its upload bandwidth (out-degree). There is no illegal solution during the evolution which ensures the evolution efficiency. Simulation results show that the proposed approach greatly enhances the reliability of the tree-like core overlay systems and achieves shorter delay simultaneously. Its reliability performance is better than the reliability-first algorithm and its delay is very close to that of the degree-first algorithm. The complexity of the proposed algorithm is acceptable for application. Therefore the proposed approach is efficient for the topology optimization of a real multicast overlay.

Damage Evolutions and AE Characteristics for Square Concrete-Filled Steel Tubular Columns Under Axial Load

Jianguang Yue,Hua Fang,Yuefei Xia,Hongquan Wang,Kai Wu 한국강구조학회 2020 International Journal of Steel Structures Vol.20 No.6

The damage evolutions of square concrete-fi lled steel tubular (CFT) columns were experimentally studied by the axial compression cyclic loading test and the acoustic emission (AE) monitoring technique. Based on the mechanical analysis and damage observations, the limit damage states, i.e. inner concrete cracking, confi nement of steel tube, yielding and buckling of steel tube, weld seam splitting and inner concrete spalling were verifi ed. The released strain energy due to the damage of CFT column was monitored by the AE technique and analyzed by the peak frequency classifi cation method. The results show that the buckling of steel tube is the damage state with the maximum load carrying capacity for CFT columns. Most of the released strain energy were detected by the AE signals with the peak frequency between 30 and 75 kHZ and most of the strain energy were released after the buckling of the steel tube.

10-m long slim sandpack experiments to investigate gel system transport behavior in porous media

Jianguang Wei,Xin Zhang,Jiangtao Li,Runnan Zhou,Songze Liu 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.10

Understanding the transport behavior of a gel system in porous media is of great significance in enhancing oil recovery (EOR) for high water cut oil reservoirs. However, the length of the experiment models (sandpack or core sample) in current studies is usually in the range of centimeter scale, which is too short to track the full movement path of gel particles. In this work, 10-m long slim sandpacks were adopted to conduct gel flooding experiments. The pressure and polymer concentration distribution along the sandpack was tracked, and scanning electron microscope (SEM) technique was employed to observe the pore morphology after the gel flooding. The results show that the movement of polymer particles is usually within 7m away from the inlet due to the adsorption and retention in the porous medium. For 0.4 PV injection cases, SEM images show that the pore morphology at the inlet region exhibits a stable polymer network, while the network structure disappears at the outlet, along with the decrease of fluid viscosity from 620.1mPa·s to 1.2mPa·s. However, we can still find the stringy state polymer after 5m movement and the viscosity is 584.0mPa·s for 1 PV gel injection cases. Four characterization parameters, including equivalent viscosity, breakthrough pressure gradient, dimensionless gelation gradient, and plugging ratio, were proposed to quantitatively characterize the performance of gel flooding. In addition, empirical models were also obtained to predict the four parameters through multi-parameters fitting, and these models facilitate the characterization of the gel flooding performance. This is the first work, to the best of the authors’ knowledge, using long slim sandpack (10m) to experimentally study gel system transport in porous media, which provides theoretical implications in enhancing oil recovery.

On the kinematic coupling of 1D and 3D finite elements: a structural model

Yue, Jianguang,Fafitis, Apostolos,Qian, Jiang Techno-Press 2010 Interaction and multiscale mechanics Vol.3 No.2

In most framed structures the nonlinearities and the damages are localized, extending over a limited length of the structural member. In order to capture the details of the local damage, the segments of a member that have entered the nonlinear range may need to be analyzed using the three-dimensional element (3D) model whereas the rest of the member can be analyzed using the simpler one-dimensional (1D) element model with fewer degrees of freedom. An Element-Coupling model was proposed to couple the small scale solid 3D elements with the large scale 1D beam elements. The mixed dimensional coupling is performed imposing the kinematic coupling hypothesis of the 1D model on the interfaces of the 3D model. The analysis results are compared with test results of a reinforced concrete pipe column and a structure consisting of reinforced concrete columns and a steel space truss subjected to static and dynamic loading. This structure is a reduced scale model of a direct air-cooled condenser support platform built in a thermal power plant. The reduction scale for the column as well as for the structure was 1:8. The same structures are also analyzed using 3D solid elements for the entire structure to demonstrate the validity of the Element-Coupling model. A comparison of the accuracy and the computational effort indicates that by the proposed Element-Coupling method the accuracy is almost the same but the computational effort is significantly reduced.

A SMOOTHING NEWTON METHOD FOR NCP BASED ON A NEW CLASS OF SMOOTHING FUNCTIONS

Zhu, Jianguang,Hao, Binbin The Korean Society for Computational and Applied M 2014 Journal of applied mathematics & informatics Vol.32 No.1

A new class of smoothing functions is introduced in this paper, which includes some important smoothing complementarity functions as its special cases. Based on this new smoothing function, we proposed a smoothing Newton method. Our algorithm needs only to solve one linear system of equations. Without requiring the nonemptyness and boundedness of the solution set, the proposed algorithm is proved to be globally convergent. Numerical results indicate that the smoothing Newton method based on the new proposed class of smoothing functions with ${\theta}{\in}(0,1)$ seems to have better numerical performance than those based on some other important smoothing functions, which also demonstrate that our algorithm is promising.

Three Dimensional Ecological Agriculture of Tan Can(谈参) - A Window of China’s Agricultural Marketization in the First Half of the 16th Century -

Yao Jianguang,Yu Ji Won 원광대학교 한중관계연구원 2021 韓中關係硏究 Vol.7 No.1

16세기 전반기 명(明)의 강남 지역에서는 농업의 상업화가 급속도로 진행되었다. 이 시기 깅남에서 활동한 담참(談參)형제의 농장 관리에 관한 기록은 당시 사회경제 발전 의 실상을 이해하는데 매우 중요한 자료이다. 이 시기에 활동했던 담참(談參)형제는 일반 농민들이 방기(放棄)한 수많은 황무지를 구입하고 노동자를 고용하여 지형에 따라 토질을 개선하여 각종 곡물, 어류, 돼지, 닭, 수예(樹藝), 채소재배 등을 혼합한 3차원적 생태농장을 건설하였다. 즉 폐기물을 활용 하는 먹이 사슬을 통해 입체적 생태농업을 실현했던 것이다. 또한 시장과의 거리 및 이윤 등을 고려하여 생산 활동을 조절함으로써 각 단계의 생산에 있어서 경제적 이익 을 극대화하여 몇 배의 수익을 창출하였다. 이러한 색다른 농업 생산 활동을 통해 막대한 부를 축적할 수 있었다. 이들 담참(談 參)형제는 축적한 부를 활용하여 다양한 공익활동을 통해 사회 환원을 실현하였다. 예 를 들면, 많은 재부(財富)를 기부하여 왜구(倭寇)에 대항하기 위한 성벽 축조에 참여하 였으며, 제방, 교각, 도로의 건설을 주도하였고, 적극적 구휼(救恤)활동 등을 통해 주변 의 칭송을 얻게 되었다. 결과적으로 이들 형제의 생태농경 방법과 행적이 『戒庵老人漫笔』등의 각종 문집에 기록되어 후세의 생태농업에 영향을 끼치게 되었다. In the first half of the 16th century, the commercialization of agriculture in Jiangnan area of the Ming Empire developed rapidly. The records of Tan Can brothers' farm management in historical materials are an important window for us to understand the social and economic development at that time. Tan Can brothers bought a large number of wasteland abandoned by peasants, hired laborers to transform it according to the terrain and soil quality, and built a three-dimensional ecological farm integrating grain, fish, pig, chicken, tree art, vegetable and many other functions, realized the utilization of waste through food chain. Meanwhile, the space level was also used, too. They arranged production according to the market and profits, and the economic benefits of all kinds of operations increased several times, and soon became rich. After becoming rich, Tan Can brothers donated a lot of money to resist Japanese pirates, build city walls and dikes, build bridges and roads, and help the poor, which won praise from the villagers and the government. Therefore, historians paid attention to them and recorded their deeds.