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An Xin,Xing Guannan,Wang Jing,Tian Yanhong,Liu Yunfang,Wan Qiong 한국탄소학회 2021 Carbon Letters Vol.31 No.4
The carbon spheres (CSs) synthesized by an ultrasonic-spray pyrolysis method were activated for supercapacitor electrode. There are plenty of cracks on the surface of the activated carbon spheres (ACSs), which expend with increasing the activation temperature and activator dosage. The specifc capacitance of ACSs increases with the activation temperature and activator dosage and reach to maximal value at certain conditions. Importantly, the ACS sample activated at relatively low activation temperature (600 °C) and 7 of mass ratio of KOH to CSs has the highest specifc capacitance (about 209 F g−1 at 50 mA g−1 of current density) and indicates the excellent cycling stability after 1000 consecutive charge–discharge cycles. Furthermore, the graphene sheets could be found in the samples that were activated at 1000 °C. And the electrode prepared by the sample has the very low series resistance because of the excellent conductivity of the formed graphene sheets.
A Xin,Liu Mingliang,Chen Tong,Chen Feng,Qian Geng,Zhang Ying,Chen Yundai 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.9
Objective: To investigate the predictive value of radiomics features based on cardiac magnetic resonance (CMR) cine images for left ventricular adverse remodeling (LVAR) after acute ST-segment elevation myocardial infarction (STEMI). Materials and Methods: We conducted a retrospective, single-center, cohort study involving 244 patients (random-split into 170 and 74 for training and testing, respectively) having an acute STEMI (88.5% males, 57.0 ± 10.3 years of age) who underwent CMR examination at one week and six months after percutaneous coronary intervention. LVAR was defined as a 20% increase in left ventricular end-diastolic volume 6 months after acute STEMI. Radiomics features were extracted from the oneweek CMR cine images using the least absolute shrinkage and selection operator regression (LASSO) analysis. The predictive performance of the selected features was evaluated using receiver operating characteristic curve analysis and the area under the curve (AUC). Results: Nine radiomics features with non-zero coefficients were included in the LASSO regression of the radiomics score (RAD score). Infarct size (odds ratio [OR]: 1.04 (1.00–1.07); P = 0.031) and RAD score (OR: 3.43 (2.34–5.28); P < 0.001) were independent predictors of LVAR. The RAD score predicted LVAR, with an AUC (95% confidence interval [CI]) of 0.82 (0.75–0.89) in the training set and 0.75 (0.62–0.89) in the testing set. Combining the RAD score with infarct size yielded favorable performance in predicting LVAR, with an AUC of 0.84 (0.72–0.95). Moreover, the addition of the RAD score to the left ventricular ejection fraction (LVEF) significantly increased the AUC from 0.68 (0.52–0.84) to 0.82 (0.70–0.93) (P = 0.018), which was also comparable to the prediction provided by the combined microvascular obstruction, infarct size, and LVEF with an AUC of 0.79 (0.65–0.94) (P = 0.727). Conclusion: Radiomics analysis using non-contrast cine CMR can predict LVAR after STEMI independently and incrementally to LVEF and may provide an alternative to traditional CMR parameters.
XML 웹 서비스 기반 항공물류 포워딩 포탈 시스템 개발
조현준,사신우,박경환 東亞大學校附設情報技術硏究所 2005 情報技術硏究所論文誌 Vol.12 No.2
Existing Airway Logistics System is not made of standard data and papers. XML Web Services is considered solving these problems. In this paper, we study how to develop Airway Logistics Forwarding Portal System based on XML Web Services. And develop the actually usable system in real business.
Abundant Manganese Complex-Anchored BiOI Hybrid Photocatalyst for Visible Light-Driven CO2 Reduction
Xin Xin,Ning Ma,Changying Hu,Qi Liang,Zhaoyong Bian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.2
An abundant manganese complex-anchored BiOI hybrid system for CO2 photocatalytic conversion was constructed. Layered BiOI and tricarbonyl Mn bipyridyl complex with carboxyl acid groups were connected with covalent bonds and used as visible light antenna and CO2 reduction reaction centers, respectively. The covalent connection of this hybrid system benefits the transfer of electrons from the semiconductor to the Mn complex. The anchoring group (carboxyl) is the key to CO2 reduction for the direct coupling of the two units, facilitating the transfer of electrons from BiOI to the manganese complexes. The photocatalytic properties and stability of the tri-carbonyl Mn–bipyridyl complex were significantly enhanced with the aid of anchored BiOI. A high turnover number (TON = 74) of HCOO- formation from CO2 could be achieved using this hybrid system under visible light irradiation.
A Video Traffic Flow Detection System Based on Machine Vision
Xin-Xin Wang,Xiao-Ming Zhao,Yu Shen 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.5
This study proposes a novel video traffic flow detection method based on machine vision technology. The threeframedifference method, which is one kind of a motion evaluation method, is used to establish initialbackground image, and then a statistical scoring strategy is chosen to update background image in real time. Finally, the background difference method is used for detecting the moving objects. Meanwhile, a simple buteffective shadow elimination method is introduced to improve the accuracy of the detection for moving objects. Furthermore, the study also proposes a vehicle matching and tracking strategy by combining characteristics,such as vehicle’s location information, color information and fractal dimension information. Experimentalresults show that this detection method could quickly and effectively detect various traffic flow parameters,laying a solid foundation for enhancing the degree of automation for traffic management.
On the Energy Based Control for Underactuated Mechanical Systems
Xin Xin 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
The energy based control approach aiming to controlling the total energy and actuated variables of underactuated mechanical systems has generated renewed interests in studying these systems. Successful applications of the approach to the swing-up control for the Pendubot (2-link planar robot with passive first joint), the Acrobot (2-link planar robot with passive second joint), and an n-link revolute planar robot with a passive joint robot, have been reported. This paper investigates whether the objective of controlling the energy and actuated variables to some given desired values can be achieved for any underactuated mechanical system. In this paper, we attempt to answer this question by studying the problem of swinging up the Acrobot like robot with a counterweight connected to its first link, called CWA (Counter- Weighted Acrobot). By analyzing globally the behavior of the solution of the closed-loop system consisted of the CWA and the controller designed via the energy based control approach, we show that unless the mechanical parameters of the CWA satisfying a constraint, the swing-up controller fails to achieve the goal of driving the energy to the desired value and stabilizing the actuated variable. Numerical simulation results are provided to validate the theoretical results.
Xin-Xin Wang(왕신신) 한국엔터테인먼트산업학회 2020 한국엔터테인먼트산업학회논문지 Vol.14 No.7
시대별과 배경에서 나타를 주제로 한 애니메이션 영화로서, 〈나타지마동강세(2019)〉와 〈나타요해1979)〉는 나타의 각기 다른 예술 이미지의 가치와 중요성을 반영하였다. 나타 인물 이미지의 가치 전향 연구는 나타 예술 이미지의 다른 스타일을 보여준다. 본 논문은 영화 속 나타 캐릭터의 예술적 표현에 따라 그 뒤에 나타나는 가치의 변화를 해석하다. 나타의 ‘선’에서‘악’이미지로의 전환은 물론, 아버지의 뜻을 거스르기 어렵다 관념에서 운명이 자신의 손에 있다는 관념으로 옮겨가는 것은 나타 이미지의 다른 가치와 의미를 시대별 배경에서 반영한다. 모든 작품에는 선명한 시대성이 있다. <나타지마동강세(2019)>는 새로운 시기 나타 캐릭터의 영화적 혁신과 내용 깊이가 새롭게 드러난 작품이다. 예술적 표현에는 여러 가지 형식이 있는데, 이러한 차별화가 애니메이션을 주름잡는 매력을 크게 증가시켜 중국 애니메이션 영화가 더 많은 발전 공간과 가치를 갖도록 하다. Ne Zha: I am the destiny(2019)and Ne Zha Conquers the Dragon King(1979)as animated films based on the theme of Ne zha in different eras and contexts, reflecting the value and significance of different artistic images of Ne zha, The study of the value turn in the character image of Ne zha reflects the different styles of artistic images of Ne zha. This thesis attempts to interpret the changing values behind the different artistic expressions of the Ne zha character in different films. The transformation of Ne zha"s image from good to evil, and the shift from the idea of "submit to the will of heaven" to the idea of "taking one"s destiny into one"s own hands" reflect the different values and meanings of Ne zha"s image in different eras. Each film is distinctly contemporary, and Ne Zha: I am the destiny is an innovative and in-depth look at the character of Ne zha in the new era of cinema. There are many forms of artistic expression, and these differences greatly increase the appeal of Ne zha"s artistic image, making Chinese animation films more space and value for development.