MRI Segmentation of a Prostate Based on Distance Regularized Level Set Evolution with a Priori Shape

Jingchun Peng,Yongde Zhang,Gang Liu,Jingang Jiang,Yanjiang Zhao 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.11

Prostate segmentation from MRI is a necessary first step and plays a key role in different stages of clinical decision making process. In this paper, we propose a MR T1 Image segmentation method of the prostate based on distance regularized level set evolution with a deformable shape prior. To smooth the prostate image to reduce the noise, we introduce a prostate image with Gaussian kernel and get an edge indicator. To avoid the leakage induced on account of prostate boundaries missing, or blending with surrounding tissues, we introduce priori shape information to construct an energy function with a distance regularization term and an external shape energy term containing the edge indicator and minimize it by solving the gradient flow which can be implemented with a finite difference scheme. To verify the MRI segmentation method of a prostate presented in this paper, we utilize the optimal value of parameters λ, μ, α and ε in the distance regularized level set evolution model and the deformable shape prior of prostate to segment a part of images from normal prostate, benign hyperplasia prostate and cancer prostate. The experiment results show that the MRI segmentation method of prostate presented in this paper is effective for different situation of different patients.

Cross-Linked Sulfonated Poly(arylene ether nitrile)s with Low Swelling and High Proton Conductivity

Jingchun Liu,Penglun Zheng,Mengna Feng,Renbo Wei,Xiaobo Liu 한국고분자학회 2017 Macromolecular Research Vol.25 No.12

A series of cross-linked composite membranes were prepared from sulfonated poly (arylene ether nitrile) (SPEN) and 2, 5-diaminobenzensulfonic acid (DABSA) via a direct cross-linking method aiming to obtain low-swelling and excellent proton conductivity membrane. This experiment had two advantages: expectant low-swelling in the extreme temperatureand excellent proton conductivity. Besides, all cross-linked membranes showed excellent thermal stability which exhibiting a temperature of initial decomposition about 250 °C. The membranes showed the IEC values varying from 1.449 to 1.675 mmol·g-1. The result suggested that the SPEN-DABSA membranes are potential candidates as PEM in DMFCs.

Nanocrystalline Copper Coatings Produced by Cold Spraying

Jingchun Liu,Hua Cui,Xianglin Zhou,Jishan Zhang,Xiangkun Wu 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1

Copper powder was cryomilled for 12 hours to achieve particle size in the range of 2 µm to 25 µm, which powder was subsequently used as feedstock for the deposition of nanocrystalline (nc) Cu coating via cold spraying. The as-milled copper powder was characterized by X-ray diffraction (XRD), scanning electron micros-copy (SEM) and high resolution transmission electron microscopy (HRTEM). The particle size of the cryomilled Cu powder was detected by laser scattering. The microstructure of the coating was analyzed using SEM and scanning transmission electron microscopy (STEM). The XRD and HRTEM analysis showed that the grain size of the cryomilled Cu powder was about 5 to 40 nm. This nanoscale structure was retained after the cold spraying. The nanoindentation analysis showed that the nc Cu coating hardness value reached 3.3GPa, which was higher than that of its coarse grained counterpart.

Robust hypothesis generation method using binary blob analysis for multi-lane detection

Piao, Jingchun,Shin, Hyunchul Institution of Electrical Engineers 2017 IET image processing Vol.11 No.12

Static and Seismic Experiments on the Beam-Column Joints of a Underground Cylindrical Garage Prefabricated Integrated Structure

Zhenbo Zhang,Jingchun Wang,Qian Yang 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3

An innovative prefabricated integrated structure for a cylindrical underground garage is designed as the bracing system during the excavation phase. A new beam-column joint for this structure is proposed. Laboratory tests are implemented to obtain the capacity, hysteresis, skeleton curve and stiff ness attenuation performance of the joint. The process of these tests is introduced in detail. Four full-scale specimens are analyzed in laboratory tests to study the infl uence of lateral loads, connection beam cross sections and column base thicknesses on the static and seismic performance of the joint. The test results show the following conclusions: (1) The lateral load only has a great infl uence on the stress in the connecting beam. (2) Reducing the cross section of the connection beam and thickness of the base column infl uence the static and seismic performance of the joints. (3) The thickness of the column base has the greatest infl uence on the vertical ultimate bearing capacity, skeleton curve, and stiff ness attenuation of the joint, followed by the cross section of the connecting beam, and fi nally the lateral load.

Elemental geochemical characteristics of Lower−Middle Permian mudstones in Taikang Uplift, southern North China Basin: implications for the FOUR-PALEO conditions

Qingshao Liang,Jingchun Tian,Xiang Zhang,Xiao Sun,Chenyu Yang 한국지질과학협의회 2020 Geosciences Journal Vol.24 No.1

The paleo-sedimentary environment can be restored qualitatively or semiqualitatively using elements or combinations of elements that are sensitive to the depositional environment. Through the analysis and testing of the main elements, trace elements and rare earth elements of twenty-one Lower–Middle Permian coal-bearing strata mudstone samples in Taikang Uplift, southern North China Basin, this study explored the FOUR-PALEO conditions (paleo-water depth, paleo-redox conditions, paleoclimate and paleo-provenance). The La and Co contents indicate that the water depth of the northern margin of the southern North China Basin became gradually shallower during the Lower–Middle Permian period. According to the U/Th, Uau, V/Cr, Ni/Co and V/Sc ratios, it is known that this section of the basin is in an oxidizing environment, and the oxidation is gradually enhanced from the Taiyuan Formation to the Lower Shihezi Formation. Paleoclimate from bivariate plot diagrams of C-value and Sr/Cu versus Ga/Rb shows that the Taikang Uplift was characterized by a warm and arid climate during the depositional period of Permian Taiyuan Formation and a warm and humid climate during the Lower Shihezi Formation and shows that the depositional period of Permian Shanxi Formation was in a transitional period of humid and arid. CIA, PIA, ICV, Th/U and K/Rb reflect the tectonic settings of the source area. From the Taiyuan Formation to the Lower Shihezi Formation, the CIA and PIA gradually increase, and the ICV gradually decreases, indicating enhanced chemical weathering and the transition from arid to humid in the source area, the arid and humid frequent change in the Taiyuan Formation, and a sudden climate change in the Shanxi Formation. Additionally, the provenance discriminant function, Zr/Sc-Th/Sr, REEs ratios, Th versus Hf-Co, Hf versus La/Th and ΣREE vs. La/Yb indicate that the type of provenance is associated with magmatic differentiation. Moreover, discriminant diagrams, consisting of K2O/Na2O versus SiO2, La-Th-Sc, Th-Sc-Zr/10 and Th-Co-Zr/10, suggest that the mudstones of Lower–Middle Permian were deposited in active continental margin tectonic settings.

Thermal Analysis of the PediaFlow Pediatric Ventricular Assist Device :

Gardiner, Jeffrey M.,Wu, Jingchun,Noh, Myounggyu D.,Antaki, James F.,Snyder, Trevor A.,Paden, David B.,Paden, Brad E. Published for the Society by J.B.Lippincott Co 2007 ASAIO journal Vol.53 No.1

Application Research on Mechanical Strength and Durability of Porous Basalt Concrete

Zhu, Yuelei,Li, Jingchun,Zhu, He,Jin, Long,Ren, Qifang,Ding, Yi,Li, Jinpeng,Sun, Qiqi,Wu, Zilong,Ma, Rui,Oh, Won-Chun Materials Research Society of Korea 2022 한국재료학회지 Vol.32 No.3

Porous basalt aggregate is commonly used in roadbed engineering, but its application in concrete has rarely been studied. This paper studies the application of porous basalt in concrete. Porous basalt aggregate is assessed for its effects on mechanical strength and durability of prepared C50 concrete; because it has a hole structure, porous basalt aggregate is known for its porosity, and porous basalt aggregates can be made full of water through changing the content of saturated basalt; after full-water condition is achieved in porous basalt aggregate mixture of C50 concrete, we discuss its mechanical properties and durability. The effects of C50 concrete prepared with basalt aggregate on the compressive strength, water absorption, and electric flux of concrete specimens of different ages were studied through experiments, and the effects of different replacement rates of saturated porous basalt aggregate on the properties of concrete were also studied. The results show that porous basalt aggregate can be prepared as C50 concrete. For early saturated porous basalt aggregate concrete, its compressive strength decreases with the increase of the replacement rate of saturated aggregate; this occurs up to concrete curing at 28 d, when the replacement rate of saturated basalt aggregate is greater than or equal to 40 %. The compressive strength of concrete increases with the increase of the replacement rate of saturated aggregate. The 28 d electric flux decreases with the increase of the replacement rate of saturated aggregate, indicating that saturated porous basalt aggregate can improve the chloride ion permeability resistance of concrete in later stages.

Dynamic Multi-objective Construction Site Layout Planning Based on BIM

Guowu Tao,Haibo Feng,Jingchun Feng,Tianhao Wang 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.4

The planning effectiveness of construction site layout greatly influences construction efficiency. Many previous studies assumed that all the facilities exist on the construction sites for the whole duration of the projects. Some researchers found the shortcomings and developed models to improve it. But these models also have different limitations, such as ignoring the future impact of the layout decision in early construction phases on the later layout quality, only considering transportation costs when optimize the layouts, etc. To address these issues, this study proposes a building information modeling (BIM)-based model that dynamically optimizes the multi-objective construction site layout. In this model, BIM and construction schedules provide the updated construction project information. This model introduces the construction phase impact on layout. The layout of each construction phase is optimized in order of corresponding phase impact. Considering the sustainable development for construction industry, the noise pollution level is chosen to be the optimization objective together with the total transportation cost. In order to balance the noise pollution level and total transportation cost, the multi-objective particle swarm optimization (MOPSO) is applied to obtain trade-off solutions. A case study is presented to demonstrate the capability of the proposed model. The results indicate that the proposed dynamic construction site layout plan (CSLP) reduces transportation cost by 43.45% and 11.46% compared with the original and static construction site layout. This study breaks the traditional site layout plan order and locates the facilities in order of their phase impact, which can greatly reduce the transportation cost on the site. It also incorporates the noise pollution reduction into CSLP to enhance on-site sustainability.

Response of Manas River fluvial landforms to tectonic movement, at the north flank of the Tianshan Mountain, China

Xingmin Shi,Youli Li,Jingchun Yang 한국지질과학협의회 2010 Geosciences Journal Vol.14 No.3

Manas River is the largest river at the north foot of Tianshan Mountain, and it is obvious that the landforms at the north flank of Tianshan Mountains respond to the tectonic movement. A hypothesis has been put forward that geomorphology of the north flank of the Tianshan Mountain Range is the result of active tectonic processes. Based on the filed survey and analysis, the hypothesis has been proved by the results of the research. By investigating into the evolutions of Manas River valley fold hills, alluvial fans and terraces, it is indicated that Tianshan Mountain piedmont has been constantly uplifted along with main body of Tianshan Mountain since Quaternary, and continues to be thrust from south to north, which makes the piedmont range constantly extend to the basin direction. The deformed main body also moves from south to north. Meanwhile, the alternant Pleistocene ice age and interglacial age climate also has significant impact on the current landform patterns of north piedmont of Tianshan Mountain.