Dual Biomimetic Thorn with Cone Structure and Hybrid Wettability for Efficient Fog Harvesting

Liang Jun Zheng(정량준),Hyun Wook Kang(강현욱) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.5

Experimental Study on a New Connection Method of Latticed Shell Joint

Liang Zheng,Xinrong Qu,Hong Guo,Shaobo Geng 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.9

In this research, the axial and eccentric pressure tests and finite element analysis (FEA) of a latticed shell joint with different parameters were carried out. The experimental and FEA results showed that the annular plate yielded first, followed by steel tube 1, and then steel tube 2 under the axial pressure and eccentric pressure. The ultimate bearing capacities of connection method II under axial pressure and eccentric pressure were 15% and 11% higher than that of connection method I, respectively. The wall thickness of steel tube 2 was reduced by 2 mm, and the ultimate bearing capacities under axial pressure and eccentric pressure is reduced by 15% and 11%, respectively. The wall thickness of steel tube 1 was reduced by 2 mm, and the ultimate bearing capacities under axial pressure and eccentric pressure is reduced by 6% and 9%, respectively. With the decrease of the concrete thickness, the ultimate bearing capacity under axial pressure and eccentric pressure reduced by 18% and 17%, respectively. The ultimate bearing capacity analysis showed that the height of the concrete and the thickness of steel tube 2 had a greater effect on the ultimate bearing capacity than the thickness of steel tube 1.

An Integrated Nomogram Combining Clinical Factors and Microtubule-Associated Protein 1 Light Chain 3B Expression to Predict Postoperative Prognosis in Patients with Intrahepatic Cholangiocarcinoma

Liang Chen,Hongyuan Fu,Tongyu Lu,Jianye Cai,Wei Liu,Jia Yao,Jinliang Liang,Hui Zhao,Jiebin Zhang,Jun Zheng,Yingcai Zhang,Yang Yang 대한암학회 2020 Cancer Research and Treatment Vol.52 No.2

Purpose Microtubule-associated protein 1 light chain 3B (LC3B) serves as a key component of autophagy, which is associated with the progression of carcinoma. Yet, it is still unclear whether LC3B is also an independent risk factor for intrahepatic cholangiocarcinoma (ICC). We aim to explore the predictive value of LC3B on prognosis of ICC, and to establish a novel and available nomogram to predict relapse-free survival (RFS) and overall survival (OS) for these patients after curative-intent hepatectomy. Materials and Methods From August 2004 to March 2017, 105 ICC patients were eligibly enrolled in the Third Affiliated Hospital of Sun Yat-sen University. Preoperative clinical information of enrolled patients was collected. Expression LC3B in the ICC specimen was detected by immunohistochemistry. Results The 5-year RFS and OS in this cohort were 15.7% and 29.6%, respectively. On multivariate Cox regression analysis, independent risk factors for 5-year OS were cancer antigen 125, microvascular invasion, LC3B expression and lymph node metastasis. Except for the above 4 factors, neutrophil/lymphocyte ratio and tumor differentiation were independent factors for 5-year RFS. The area under the curve of nomograms for OS and RFS were 0.820 and 0.747, respectively. Conclusion The nomograms based on LC3B can be considered as effective models to predict postoperative survival for ICC patients.

Computation Controllable Mode Decision and Motion Estimation for Scalable Video Coding

Liang-Wei Zheng,Gwo-Long Li,Mei-Juan Chen,Chia-Hung Yeh,Kuang-Han Tai,Jian-Sheng Wu 한국전자통신연구원 2013 ETRI Journal Vol.35 No.3

This paper proposes an efficient computation-aware mode decision and search point (SP) allocation algorithm for spatial and quality scalabilities in Scalable Video Coding. In our proposal, a linear model is derived to allocate the computation for macroblocks in enhancement layers by using the rate distortion costs of the base layer. In addition, an adaptive SP decision algorithm is proposed to decide the number of SPs for motion estimation under the constraint of the allocated computation. Experiment results demonstrate that the proposed algorithm allocates the computation resource efficiently and outperforms other works in rate distortion performance under the same computational availability constraint.

The In-Plane Effective Length Factor of Web Members of the Steel Truss

Liang Zheng,Xinrong Qu,Ying Gao,Hong Guo 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3

In the code for design of steel structures, the eff ective length factor of the support and other web members of the steel trusses composed of double angle steel were taken as 1.0 and 0.8, respectively. However, the eff ective length factor of the support and other web members did not take into account factors such as the stiff ness provided by non-adjacent members, the stiff ness of the joint itself, and the infl uence of load changes in the code for design of steel structures. To consider the above infl uencing factors, a fi nite element model, based on the steel truss atlas, was established in Abaqus, the elastic restraint stiff ness of the web member end was obtained through numerical analysis. The equation was established according to the restraints of the web member end, and the eff ective length factors of the web member were obtained by solving the equation with Matlab. The analysis found that the elastic restraint stiff ness of the web member provided by the bottom chord would not increase by increasing the tension of the bottom chord within the range of elastic deformation. The elastic restraint stiff ness of the web member provided by the top chord would not weak by increasing the pressure of the top chord within the range of elastic deformation. It was recommended that the eff ective length factors of the support and other web members of the steel truss should be 0.8 and 0.7, respectively.

Optimization of Parameters for LCL Filter of Least Square Method Based Three-phase PWM Converter

Zheng, Hong,Liang, Zheng-feng,Li, Meng-shu,Li, Kai The Korean Institute of Electrical Engineers 2015 Journal of Electrical Engineering & Technology Vol.10 No.4

LCL filters are widely used in three-phase PWM converter for its advantages of small volume, low cost and inhibition of high frequency current harmonic. However, it is difficult to optimize its design because its parameters are mutually influenced while the value of each parameter for LCL filter has impacts on the converter's cost and size. In this paper, the target of optimization is to minimize the parameter values of LCL filter, and an optimization method for parameters of LCL filter of three-phase PWM converter based on least square method is proposed. With this method, a quantitative calculation of the harmonic component of the converter’s side phase voltage is performed first, and then the quantitative relationship between phase voltage harmonics and grid phase current harmonics is analyzed. After that, the attenuation requirement of each harmonic is obtained by taking into account the requirements for each harmonic component of grid current. Then according to the optimization objective, the objective function with minimum harmonic attenuation deviation is established, and least squares method is adopted for three-dimensional global searching of parameters for LCL filter. Thus, the designed harmonic attenuation curve approximates the minimum attenuation requirements, and the optimized LCL filter parameters are obtained. Finally, the effectiveness of the method is verified by the experiments.

Theoretical analysis of natural evaporative cooling to enhance the efficiency of thermoelectric devices

Zheng, Liang Jun,Kang, Dong Hee,Kim, Na Kyong,Youn, Young Jik,Kang, Hyun Wook Elsevier 2019 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.143 No.-

<P><B>Abstract</B></P> <P>Theoretical model of thermoelectric generator (TEG) cooled by direct evaporative cooling technology is developed. In the theoretical model, thermoelectric material properties depending on temperature change and effects of heat loss by radiation, conduction, and Thomson phenomenon are considered. To investigate the effect of evaporative cooling to the efficiency of TEG, the simulation conditions are set as hot-side temperature of 40–120 °C and 1 mm thickness of thin water film covering for cold-side. The ambient temperature is 25 °C and the relative humidity of the air is set from 25% to 75%. Based on the developed theoretical model, the output power of TEG is increased as increasing hot side temperature under fixed relative humidity or as decreasing relative humidity under fixed hot-side temperature. Consequently, the maximum output power of 130.69 W m<SUP>−2</SUP> and an efficiency of 1.63% are obtained with 25% relative humidity and 120 °C for the hot-side temperature condition. The results show that the output power and efficiency are increased 100.53 and 10.53 times higher than without evaporative cooling (natural convection case, output power of 1.30 W m<SUP>−2</SUP> and efficiency of 0.1548%), respectively.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Theoretical model of TEG cooled by direct evaporative cooling technology. </LI> <LI> Thermophysical relations in TEG system and cooling process at theoretical model. </LI> <LI> Analyzing thermal resistance network for quantifying heat flow rates and heat dissipation rates. </LI> <LI> Increasing TEG performance by applying evaporative cooling technology. </LI> <LI> TEG performance evaluation based on hot-side temperature and relative humidity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Prognostic Value of C-Reactive Protein in Esophageal Cancer: a Meta-analysis

Zheng, Tian-Liang,Cao, Ke,Liang, Cui,Zhang, Kai,Guo, Hai-Zhou,Li, De-Ping,Zhao, Song Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.19

Background: The classical inflammatory biomarker, C-reactive protein (CRP), has been identified to be related to progression of esophageal cancer. Some research showed that elevated pretreatment serum CRP indicated a poor prognosis, but results have been inconsistent. Materials and Methods: We searched the Medline, Embase and the Cochrane Central Search Library for suitable studies and a meta-analysis of eleven (1,886 patients) was conducted to examine the relationship between elevated serum CRP level and overall survival (OS) in esophageal cancer cases. Moreover, correlation analyses were conducted to assess links between pretreatment serum CRP level and tumor node metastasis (TNM) stage as well as T, N, M grade, respectively. Results: The pooled analysis showed that elevated pretreatment serum CRP level was significantly associated with poorer overall survival (HR 2.09, 95%CI 1.52-2.87, p<0.01). Subgroup analyses were conducted by "country", "cut-off value", "treatment" and "number of patients", and no single factor could alter the result. Elevated pretreatment serum CRP was significantly correlated with more advanced TNM stage and T, N, M grade respectively. Conclusions: Elevated pretreatment serum CRP levels are associated with poorer prognosis in esophageal cancer patients, and could serve as a useful biomarker for outcome prediction.

Compound glycyrrhizin injection for improving liver function in children with acute icteric hepatitis: A systematic review and meta-analysis

Liang Shi-Bing,Hou Wen-Bin,Zheng Ruo-Xiang,Liang Chang-Hao,Yan Li-Jiao,Wang Hao-Nan,Cao Hui-Juan,Han Mei,Robinson Nicola,Liu Jian-Ping 한국한의학연구원 2022 Integrative Medicine Research Vol.11 No.1

Background: Compound glycyrrhizin injection (CGI) is a preparation with glycyrrhizin as the main active ingredient extracted from licorice. As clinical trials suggest that CGI is effective in improving liver function for acute icteric hepatitis in children (AIHC), this systematic review aimed to evaluate and verify its therapeutic effects and safety. Methods: Six electronic databases were searched from their inception to 15 May 2021. Randomized controlled trials (RCTs) assessing therapeutic effects and safety of CGI for AIHC were included. The risk of bias for each trial was assessed using the Cochrane Risk of Bias Tool 2.0. Primary outcomes were indexes related to liver function, including total bilirubin (TBiL), alanine aminotransferase (ALT) and aspartate transaminase (AST). RevMan 5.4 software was used for data analyses. The certainty of the evidence was assessed using the online GRADEpro tool. Results: Six RCTs involving 608 children were included. The overall bias was assessed as having “high risk of bias” in all trials. All trials compared the combination of CGI and conventional western medicine (CWM) with CWM alone. Regarding the effects of CGI for AIHC, results showed that CGI plus CWM was superior to CWM alone in reducing the levels of TBiL (mean difference (MD) = -8.19 mmol/L, 95% CI -9.86 to -6.53), ALT (MD = -24.09 U/L, 95% CI -30.83 to -17.34) and AST (MD = -18.67 U/L, 95% CI -21.88 to -15.45). No trial reported adverse events. The certainty of the evidence for outcomes were all evaluated as low or very low. Conclusion: CGI may have adjuvant therapeutic effects on improving the liver function of children with AIHC. There is no evidence to determine the safety of CGI for AIHC. As current evidence is weak, further well-designed RCTs are required for verification of the therapeutic effects of CGI. Background: Compound glycyrrhizin injection (CGI) is a preparation with glycyrrhizin as the main active ingredient extracted from licorice. As clinical trials suggest that CGI is effective in improving liver function for acute icteric hepatitis in children (AIHC), this systematic review aimed to evaluate and verify its therapeutic effects and safety. Methods: Six electronic databases were searched from their inception to 15 May 2021. Randomized controlled trials (RCTs) assessing therapeutic effects and safety of CGI for AIHC were included. The risk of bias for each trial was assessed using the Cochrane Risk of Bias Tool 2.0. Primary outcomes were indexes related to liver function, including total bilirubin (TBiL), alanine aminotransferase (ALT) and aspartate transaminase (AST). RevMan 5.4 software was used for data analyses. The certainty of the evidence was assessed using the online GRADEpro tool. Results: Six RCTs involving 608 children were included. The overall bias was assessed as having “high risk of bias” in all trials. All trials compared the combination of CGI and conventional western medicine (CWM) with CWM alone. Regarding the effects of CGI for AIHC, results showed that CGI plus CWM was superior to CWM alone in reducing the levels of TBiL (mean difference (MD) = -8.19 mmol/L, 95% CI -9.86 to -6.53), ALT (MD = -24.09 U/L, 95% CI -30.83 to -17.34) and AST (MD = -18.67 U/L, 95% CI -21.88 to -15.45). No trial reported adverse events. The certainty of the evidence for outcomes were all evaluated as low or very low. Conclusion: CGI may have adjuvant therapeutic effects on improving the liver function of children with AIHC. There is no evidence to determine the safety of CGI for AIHC. As current evidence is weak, further well-designed RCTs are required for verification of the therapeutic effects of CGI.

Tri-Axial Confining Numerical Test and Settlement Analysis of the Gravel Layer

Liang Zhang,Zhengwei Guo,Zheng Liang 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.9

The discrete element method (DEM) is used according to the discreteness of the gravel layer to analysis the gravel particle. This paper presents simulations of tri-axial experiment tests and settlement of gravel layer. The stress-strain curves of gravel layer were analysed with different confining pressure through tri-axial numerical test, and the effect with different particle parameters and confining pressures was analysed. The numerical model of gravel layer after the excavation was established by the DEM to statistically analyse the settlement of gravel layer. The analyses results show that confining pressure corresponds to axial pressure that be destroyed of gravel particle model. The static friction coefficient has little effect on the failure of the tri-axial confining experimental model. The experiment model with various particle sizes need higher axial stress that be destroyed than the same particle size. During the collapse of the gravel stratum, the gravels are closer to the top of the hole which have a larger shift of settlement and a faster sedimentation rate. If the gravel are further away from top of the hole which have a smaller shift of settlement and slower sedimentation rate. The settlement of gravel causes the forces variation in all directions.