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Xue Zheng,Weimin Li,Armin G. Aberle,Selvaraj Venkataraj 한국물리학회 2016 Current Applied Physics Vol.16 No.10
Thin-film chalcopyrite Cu(In1x,Gax)Se (CIGS) solar cells have recently achieved an efficiency of ~22% at the lab scale, making the technology more promising for commercial applications than most other thinfilm solar cells. Using numerical device simulations, this study provides approaches to enhance the efficiency of ultra-thin CIGS solar cells. Effects of various Ga grading profiles in the CIGS absorber and of surface bandgap modifications are simulated. Our simulation results reveal that, in ultra-thin CIGS solar cells, back grading is an effective and practical approach to increase the cell efficiency, while front grading is unfeasible due to unacceptable current and fill factor losses. The quality of the back surface is of particular importance in moderately graded cells, while interface and bulk defect properties dominate in extremely graded cells. By introducing an ordered vacancy compound (OVC) layer with a downwardshifted valence band at the CIGS surface, the interface recombination losses can be significantly suppressed due to the reduced hole concentration. The thickness of the OVC layer and the valence band offset (VBO) between the OVC and CIGS materials are critical parameters for the cell efficiency. The simulations reveal that an optimized CIGS cell with a 300 nm thick CIGS absorber, a back-graded absorber profile and a 70 nm thick OVC layer at the CIGS surface can reach a 1-Sun efficiency of over 12%.
The influence of lattice defects on the crystal structure of hydrothermal BaTiO3 powders
Xuezheng Wei,Yali Lia 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
Fine powders of Barium titanate (BaTiO3) were hydrothermally prepared and heat treated at various temperatures from 400 oC to 1200 oC for 1 hour. The as-prepared and heat-treated powders were characterized by thermogravimetric analysis (TGA), Raman spectroscopy, and X-ray diffractometry (XRD). All these powders were identified as tetragonal phase by Raman spectroscopy. The XRD results show that the tetragonality or c/a ratio in heat-treated BaTiO3 powders increases with heat treatment temperature. This suggests that lattice water and lattice vacancies suppress the phase transition from cubic to tetragonal in hydrothermal BaTiO3 powders, but do not prevent it completely.
Devil or God: Image Transformation of Chinese Mythology Character “Nezha”(1927-2019)
Xuezheng Shen(심학정),Jingwen Li(이정문),Yunzhuo Zhang(장원탁),Shanshan Liu(유산산),Jangsun Hong(홍장선),Jongyoon Lee(이종윤) 한국만화애니메이션학회 2020 만화애니메이션연구 Vol.- No.58
중국 신화는 전 세계 문화 콘텐츠 산업에 풍부한 영감의 원천을 제공한다. Nezha(哪吒), 쑨우콩(孙悟空), 뮬란(花木兰)등 일부 중국 전통 캐릭터는 이미 널리 알려져 있다. 콘텐츠 제작자들은 반복적으로 각색하고 재창작하여 서로 다른 이미지를 다양한 형태로 중국, 일본, 미국 등 국가에게 퍼져나갔다. 그 중에서도 Nezha는 중국 본토의 신이 아니지만 가장 영향력 있는 신화 캐릭터다. 본 연구는 2019년 개봉된 인기 애니메이션 영화〈나타지마동강세〉를 시작으로 지난 100년 동안 서로 다른 작품에 등장한 50여개의 다른 이미지들을 연구 표본으로 삼았다. 본 연구는 이미지 분석 방법을 통해 이미지 변화의 이유관계를 서로 연결하기 위해 4개의 역사적 단계로 나누고 세계로부터 다문화주의의 영향을 받는 신화적 원형으로서 변화된 Nezha(哪吒)를 탐구한다. 마지막으로, 트랜드 미디어 스토리텔링에서 신화적 원형의 이미지는 문화적 유인과 문화적 활동가들로 인해 사회문화와 대중의 인지에 다원적인 변화를 수반한다고 보았다. Chinese mythology provides an inexhaustible source of inspiration for cultural content industries around the world. For instance, content producers are familiar with Nezha, Sun wukong, Mulan, and other traditional Chinese characters. These have subsquently been repeatedly adapted, recreated, and spread in different forms in China, Japan, the United States, and other countries. Among them, Nezha is the most influential mythical character, although he isn"t a native Chinese god. Starting from the most popular animated film 〈Nezha: Birth of the Devil〉in 2019, this paper sorts out 50 different Nezha"s images, which have appeared in various works over the past 100 years, as a research sample. Through the method of image analysis, this paper divides them into four historical stages to interpret the reason for image transformation. This paper explores "transformed" Nezha as a mythological archetype affected by multiculturalism from the world. Finally, the study concludes that the image of the mythical archetype in the transmedia storytelling will be accompanied by multiple changes in social culture and audience recognition because of the cultural attractors and cultural activators.
UPF Tracking Method Based on Color and SIFT Features Adaptive Fusion
Yibo Li,Xuezheng Zhuang,Yanmei Liu 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.6
Based on the problems that target appears rotation and noise interference in complex environment, an improved multi-feature adaptive fusion tracking method is proposed. The algorithm adopts unscented Kalman particle filter (UPF) to update the measurement information in the sample particles, better overcome the problem of the particle weight degradation. In addition, in order to overcome the defects of additive and multiplicative fusion algorithm in the feature selection, the multiple adaptive fusion characteristics method that target color distribution and scale invariance feature (SIFT) are used as complementary information. Experimental results show that the proposed method is superior to the traditional methods which are based on fixed weight or standard particle filter.
沈?政(Shen Xuezheng),?祝成(Su Zhucheng),李幸哲(Lee Haengcheol) 동아인문학회 2020 동아인문학 Vol.50 No.-
Through the study of tea poetry in Tang dynasty, this paper aims at sorting out the connotation elements of Chinese tea culture spirit. First of all, based on the contemporary literature related to tea culture with high citation rate, we sorts out the concept words of spiritual connotation of tea culture, and concludes that “Qing, Jing, He, Jing, Yi, Zhen” are the high-frequency words in the core spirit of Chinese tea culture. Secondly, combining with the analysis of tea poetry in the Tang dynasty as a specific text context, the text analysis and statistics of the core spiritual connotation of tea culture are carried out to trace and deconstruct the core spiritual connotation of tea culture. Thirdly, taking the Huzhou poets group in the Tang dynasty as the case study, carries on the detailed poetry analysis. Finally, the conclusion is drawn that the Chinese tea culture in the Tang dynasty has the cultural and spiritual connotation of “tranquility”, which, together with the current pursuit of “respect and harmony” culture, forms the dual characteristics of Chinese tea culture, reflecting the different use values of “we” and “others” respectively. With the development of history, Chinese tea culture shows the differences of mainstream thoughts due to the demands of specific times or social groups.
Narrative, Interaction, Visual, Emotion - Research on Chinese Indie Game Design
Peng Honglu(펑훙루),Shen Xuezheng(심학정),Kim Chee-Hoon(김치훈) 한국만화애니메이션학회 2021 만화애니메이션연구 Vol.- No.63
중국의 인디 게임은 비록 시작은 늦었지만 세계적으로 성공한 작품이 적지 않을 정도로 빠르게 성장하고 있다. 본 논문에서는 사례분석을 통해 중국의 대표적인 인디 게임 3편을 분석하였다. 게임의 네러티브와 게이머 입장의 장면 연출 그리고 게이머 감정의 관점에서 심층 분석을 하여 인디 게임과 일반적인 커머셜 게임과의 차이점을 도출하였다. 게임 이용자들에게 무엇이 게임 체험에 몰입을 더욱 유도하고 차별적인 예술적 특성이 무엇인지 분석함으로써 인디 게임 개발의 디자인 참고 자료로 활용될 수 있기를 기대한다. Although Chinese indie games started late, they have developed rapidly, and many works have been successful globally. Through case analysis, this paper selects three representative indie games in China, conducts in-depth analysis from the perspectives of narrative, visual scene of game-play, emotion, etc and summarizes the characteristics of indie games that distinguish from the general commercial games. It is hoped that game users will be able to use it as a design reference for indie game development by analyzing what makes users more immersed in the game experience and what discriminatory artistic characteristics are.
Hydrothermal synthesis of tetragonal BaxSr(1-x)TiO3 powders
Nitin P. Padture,Xuezheng Wei 한양대학교 세라믹연구소 2004 Journal of Ceramic Processing Research Vol.5 No.2
Barium-strontium titanate (BaxSr(1-x)TiO3 or BST) powders, with x ranging from 0 to 1, were synthesized hydrothermally at 200 oC by reacting a Ti(OH)4 gel with Ba(OH)2 and Sr(OH)2. The resulting BST powders were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy. The mean particle sizes were found to be between 80 nm to 150 nm. The BST powders were found to be richer in Sr relative to the compositions of the corresponding hydrothermal solutions, indicating easier incorporation of Sr, compared to Ba, in the powders. All powders were found to be single-phase solid-solutions, and were determined to be cubic using XRD. However, Raman spectroscopy has revealed, for the first time, the presence of tetragonality in Ba-rich hydrothermal BST powders.