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Xiaojun Tan,Dachun Jin,Jian Hu,Weili Zhang,Yu Zhou,Yunxiang Li,Yuanfeng Zhang,Ji Wu 대한비뇨의학회 2021 Investigative and Clinical Urology Vol.62 No.4
Purpose: This study aimed to develop a simple nomogram based on the Mayo Adhesive Probability (MAP) score combined with the RENAL nephrometry score (RNS) to predict intraoperative complications before partial nephrectomy (PN) in Asian populations. Materials and Methods: This study retrospectively collected patients undergoing PN at three medical centers. Each component of the MAP score and the RNS (6 variables) was evaluated to assess its association with intraoperative complications by multivariable logistic regression with backward elimination. Results: A total of 46 cases (7.2%) with intraoperative complications were identified among 637 patients. After backward elimination, three variables, including tumor diameter (4–7 cm vs. ≤4 cm: odds ratio [OR], 4.339; 95% confidence interval [CI], 1.943–9,692; ≥7 cm vs. ≤4 cm: OR, 8.434; 95% CI, 1.225–58.090), nearness to the collecting system (4–7 mm vs. ≥7 mm: OR, 2.988; 95% CI, 1.293–6.907; ≤4 mm vs. ≥7 mm: OR, 21.394; 95% CI, 6.122–74.756), and perirenal fat stranding type (type 1 vs. no stranding: OR, 3.119; 95% CI, 1.079–9.017; type 2 vs. no stranding: OR, 18.722; 95% CI, 6.757–51.868), were retained. The predictive power (measured by area under the curve [AUC]) of the nomogram was observed to be superior to the RNS or MAP score alone (RNS: 0.686, MAP score: 0.729, the nomogram: 0.837), but comparable to their combination (0.813). Conclusions: The simple nomogram contains fewer components than the combination of the RNS and MAP scores yet demonstrates equivalent predictive power for intraoperative complications.
Ji, Zhendong,Zhao, Jianfeng,Sun, Yichao,Yao, Xiaojun,Zhu, Zean The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
Cascaded H-Bridge (CHB) converters can be directly connected to medium-voltage grids without using transformers and they possess the advantages of large capacity and low harmonics. They are significant tools for providing grid connections in large-capacity renewable energy systems. However, the reliability of a grid-connected CHB converter can be seriously influenced by the number of power switching devices that exist in the structure. This paper proposes a fault-tolerant control strategy based on double zero-sequence voltage injection and DC voltage optimization to improve the reliability of star-connected CHB converters after one or more power units have been bypassed. By injecting double zero-sequence voltages into each phase cluster, the DC voltages of the healthy units can be rapidly balanced after the faulty units are bypassed. In addition, optimizing the DC voltage increases the number of faulty units that can be tolerated and improves the reliability of the converter. Simulations and experimental results are shown for a seven-level three-phase CHB converter to validate the efficiency and feasibility of this strategy.
Zhendong Ji,Jianfeng Zhao,Yichao Sun,Xiaojun Yao,Zean Zhu 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
Cascaded H-Bridge (CHB) converters can be directly connected to medium-voltage grids without using transformers and they possess the advantages of large capacity and low harmonics. They are significant tools for providing grid connections in large-capacity renewable energy systems. However, the reliability of a grid-connected CHB converter can be seriously influenced by the number of power switching devices that exist in the structure. This paper proposes a fault-tolerant control strategy based on double zero-sequence voltage injection and DC voltage optimization to improve the reliability of star-connected CHB converters after one or more power units have been bypassed. By injecting double zero-sequence voltages into each phase cluster, the DC voltages of the healthy units can be rapidly balanced after the faulty units are bypassed. In addition, optimizing the DC voltage increases the number of faulty units that can be tolerated and improves the reliability of the converter. Simulations and experimental results are shown for a seven-level three-phase CHB converter to validate the efficiency and feasibility of this strategy.
Junchang Lu,Li Xu,Xiaojun Jiang,Songhai Jia,Ming Li,Chongxi Yuan,Xingliao Zhang,Qiang Ji 한국고생물학회 2009 고생물학회지 Vol.25 No.1
A new dinosaur fauna, the Ruyang Gigantic Sauropod Dinosaurian Fauna from the early Late Cretaceous of the Ruyang Basin is named. The new dinosaurian fauna is dominated by large-sized sauropod dinosaurs, companying with theropod dinosaurs, such as omithomimid, oviraptorid, spinosaurid and carcharodontosaurid dinosaurs. Two new taxa are erected, they are a oviraptorid dinosaur Luoyanggia liudianensis gen. et sp. nov., and a sauropod Xianshanosaurus shijiagouensis gen et sp. nov. The dinosaur assemblage from the Ruyang Basin indicates that the dinosaur-bearing deposits are Cenomanian in age.
Distance Estimation Methods in Vehicular Application: An Experimental Study
Yiwen Cao,Xinglong Lu,Zhonghua Zhao,Xiaojun Ji,Yilin Yan 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
Passive Entry and Passive Start (PEPS) system allows drivers to enter the vehicle and start the engine without activating key fob. With growing demand for location-based service and rapid development of Bluetooth Low Energy (BLE), BLE PEPS with localization service becomes a promising choice for next generation of PEPS. This paper studies the critical problem of localizing the vehicle for user based on BLE received signal strength (RSS) provided by preinstalled BLE Access Points (APs) inside vehicle. Multiple APs are employed to reduce the error caused by RSS fluctuation on distance estimation. Fusion algorithms including Extended Kalman Filter, Monte Carlo Localization and Iterative Trilateration are compared based on experiments in vehicle. Experimental results show that distance estimation based on Extended Kalman Filter gets high accuracy in both long distance and short distance scenario.
67-fs pulse generation from a mode-locked Tm,Ho:CLNGG laser at 2083 nm
Zhao, Yongguang,Wang, Yicheng,Chen, Weidong,Pan, Zhongben,Wang, Li,Dai, Xiaojun,Yuan, Hualei,Zhang, Yan,Cai, Huaqiang,Bae, Ji Eun,Choi, Sun Young,Rotermund, Fabian,Loiko, Pavel,Serres, Josep Maria,Mat The Optical Society 2019 Optics express Vol.27 No.3
Sub-80 fs mode-locked Tm,Ho-codoped disordered garnet crystal oscillator operating at 2081 nm
Pan, Zhongben,Wang, Yicheng,Zhao, Yongguang,Kowalczyk, Maciej,Sotor, Jarosław,Yuan, Hualei,Zhang, Yan,Dai, Xiaojun,Cai, Huaqiang,Bae, Ji Eun,Choi, Sun Young,Rotermund, Fabian,Loiko, Pavel,Serres, Jose The Optical Society 2018 Optics letters Vol.43 No.20