The Band Offset at CdS/Cu2ZnSnS4 Heterojunction Interface

Ji Li,Qingyang Du,Weifeng Liu,Guoshun Jiang,Xuefei Feng,Wenhua Zhang,Junfa Zhu,Changfei Zhu 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4

The band offset at the CdS/Cu2ZnSnS4 heterojunction interface is studied by measuring the valence band spectra using synchrotron radiation photoemission spectroscopy. The Cu2ZnSnS4 thin films are prepared by the sulfurization of electrodeposited Cu-Zn-Sn precursors. A CdS overlayer is sequentially grown on the Cu2ZnSnS4 thin films from a chemical bath deposition process. Valence band spectra were obtained before and after each period of growth to study the electronic structure at the heterojunction interface. The valence band offset was determined to be 0.96 eV, and the conduction band offset was determined to be .0.06 eV. This means that the CdS/Cu2ZnSnS4 hetrojunction has a ‘type II’ band alignment which will cause largescale recombination at the interfaces and will not be suitable for solar cells fabrication.

Impact of Cardiovascular Disease on Health Insurance Coverage and Healthcare Use under Economic Stress: The National Health and Nutrition Examination Survey, 2003–2012

Ji Li,Shenghan Lai,Shaoguang Chen,Hong Lai 질병관리본부 2019 Osong Public Health and Research Persptectives Vol.10 No.3

Objectives: Cardiovascular disease (CVD) has a substantial financial impact on healthcare systems in the US. This study aimed to examine the impact of CVD on health insurance coverage and health service use under economic stress as indicated by the Great Recession in the US (December 2007-June 2009). Methods: Data of 26,483 adults aged ≥ 20 years from the 2003-2012 National Health and Nutrition Examination Survey were analyzed. There were 9,479 adults assigned to the group “before the Great Recession” (2003-2006), 5,674 adults assigned to “during the Great Recession” (2007-2008), and 11,330 adults assigned to “after the Great Recession” (2009-2012). Results: Patients with CVD from low-income families were more likely to have health insurance during the recession (OR:1.57, 95% CI: 1.01,2.45). Those participants without CVD, who were from low-income families or < 65 years, were more likely to use the emergency room rather than primary care facilities to gain access to routine healthcare (p < 0.05). Patients with CVD from high-income families were also more likely to use the emergency room (p < 0.05). Patients with CVD but not those without CVD, who reported a high family income or were ≥ 65 years old, were less likely to use mental health services during the recession than before the recession. Conclusion: Effective strategies need to be developed to promote primary care use among the general adult American population. In addition, use of mental health services among patients with CVD needs to be improved when financial stress occurs.

The Malleability of Culture and Leadership Style in East Asia

Ji Li,Ping Ping Fu,Zhiqiang Liu,Y.Y. Chen 한국조직경영개발학회 2008 조직경영개발연구 Vol.1 No.1

글로별 리더십과 조직행동유효성 프로그램 (GLOBE) 의 데이터를 분석하여 우리는 동아시아 국가들 사이에 문화와 리더십 스타일에 차이가 있다는 것을 발견하였다. 이런 차이를 설명하기 위하여 우리는 새로운 이론적 관점인 제도적 공생이라는 관점을 개발하였다. 생물학의 개념에 해당되는 이 제도적 공생의 관점은 상이한 개체 또는 종들이 어떻게 제도적 환경을 포함한 어떤 환경에서 함께 살아가게 되는지를 설명한다. 이 새로운 관점은 제도파 이론에서 보이는 한계들을 극복할 수 있게 한다. 또한 사회문화와 합법적 리더십 스타일을 포함한 사회제도의 동태적인 성격을 이해하는데 도움을 준다. 이 새로운 개념이 학자와 실무자들에게 주는 시사점으로 결론을 맺었다. Analyzing the data collected for the Global Leadership and Organizational Behavior Effectiveness Program (GLOBE), we found some interesting differences in culture and leadership style among economies in East Asia. To explain these differences, we develop a new theoretical perspective, institutional symbiosis. Developed from a similar concept in biology, the perspective of institutional symbiosis describes how different species or elements closely living together in a certain environment, including institutional environment. This new perspective helps overcome some limitations in the current literature of institutional theory. It can also improve our understanding of the dynamic nature of social institutions, including societal cultures and legitimate leadership style. The paper concludes with a discussion on the implications of this new perspective for researchers and practitioners.

Serrated Behaviors and Plasticity of Nb-Alloyed Cu-Based Bulk Metallic Glasses

Jili Wu,Ziyi Zhou,Zhen Peng 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.10

This paper is to disclose the plastic deformation mechanism of 3 Nb-alloyed bulk metallic glasses and composites via theanalysis of serration dynamics. The as-cast alloys with 1.0 at% and 2.0 at% of Nb element display the large time windowof serrated events, implying that the serrated behavior can dynamically retain in a long-time scale and thus the alloys areendowed the largest compressive plasticity. The statistic results suggest that the serrated flow of both alloys with 1.0 at% and2.0 at% Nb element achieves the self-organized critical state. The normal probability plots were utilized to further evaluateserrated dynamics and demonstrate that large deviations from the mean value of stress drops facilitate the self-organizedcritical state of serrations. This work suggests that large plastic bulk metallic glasses and composites are characterized bynon-normal probability of serration statistics during plastic deformation.

How Is Degenerative Lumbar Scoliosis Associated with Spinopelvic and Lower-Extremity Alignments in the Elderly

Wang Jili,Ushirozako Hiroki,Yamato Yu,Ide Koichiro,Hasegawa Tomohiko,Yoshida Go,Banno Tomohiro,Oe Shin,Arima Hideyuki,Mihara Yuki,Watanabe Yuh,Nakai Keiichi,Kurosu Kenta,Hoshino Hironobu,Matsuyama Yuk 대한척추외과학회 2023 Asian Spine Journal Vol.17 No.2

Study Design: A retrospective cohort study.Purpose: Our aim is to investigate the relationship between degenerative lumbar scoliosis (DLS), and whole-body alignment, including spinopelvic and lower extremity alignments. Overview of Literature: DLS is a deformity commonly associated with aging. However, the correlation between whole-body alignment and DLS remains controversial.Methods: Adult volunteers aged over 50 years were included in the study after participating in the screening program. Characteristic data and standing radiographic parameters were assessed. A propensity score model was established with adjustments for age and sex after a preliminary analysis, and cases were divided into DLS (Cobb angle >10°) and non-DLS (Cobb angle ≤10°) groups.Results: There were significant differences in age, sex, C2 sagittal vertical axis (C2-SVA), C7-SVA, T1 pelvic angle (TPA), lumbar lordosis (LL), pelvic incidence (PI), pelvic tilt (PT), PI minus LL (PI–LL), knee angle, ankle angle, pelvic shift, C7-center sacral vertical line, L4 tilt, femur-tibia angle, and hip-knee-ankle angle (all p <0.05) using a preliminary analysis of 261 cases (75 DLS and 186 non-DLS). A one-to-one propensity score-matched analysis was used after 70 pairs of cases were selected. There were no significant differences in the characteristic data for lower extremity parameters. There were still significantly higher values of C2-SVA, TPA, PI, PT, and PI–LL in DLS group than in non-DLS group (all p <0.05).Conclusions: This study showed an important relationship between DLS and sagittal spinal deformity. However, DLS was not associated with the sagittal and coronal lower extremity alignments.

중국의 “영업세 부가가치세 개혁”의 재정수입 효과와 향후 개혁대안에 대한 연구

Hu Jili 한국지방재정학회 2016 한국지방재정학회 세미나자료집 Vol.2016 No.10

중국의 “영업세 부가가치세 개혁”은 중국의 특유한 역사적조건과 배경하에 이루어진것으로서 개혁시행을 진행한 이후로 여러번 조정되여 왔다. 이번 개혁이 현재 “공급측” 구조조정에 큰 가치와 의미를 갖고 있음은 두말할것도 없다. 중국경제발전이 새 단계로 진입함에 따라 세수에 대한 요구도 새로운 변화를 나타내고 있으며 이번 “영업세 부가가치세 개혁” 은 이러한 배경하에서 추진되고 있다. 2012년 “영업세 부가가치세 개혁” 이후 중국의 세수제도가 점차 완성되고 산업구조의 그레드업이 점차 진행되고 있다.본연구에서는 CGE모델의 구출을 통해 “영업세 부가가치세 개혁”이 재정수입총액에 미치는 장기적과 단기적 영향을 분석하고자 하였다. 단기적으로 볼때 이번 개혁은 재정수입을 축소시키나 장기적으로 볼때 이번 개혁으로 인하여 큰 재정수입이 이루어질수 있다는것이다. 그리고 모델분석에 기초하여 향후 “영업세 부가가치세 개혁”의 구체적 대안에 대해 모색하였다.

Experimental Measurement and Monte Carlo Simulation the Correction Factor for the Medium-Energy X-ray Free-air Ionization Chamber

Yu Jili,Wu Jinjie,Liao Zhenyu,Zhou Zhenjie 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.73 No.10

A key comparison has been made between the air-kerma standards of the National Institute of Metrology (NIM), China, and other Asia Pacific Metrology Programme (APMP) members in the medium-energy X-ray. This paper reviews the primary standard Free-air ionization chamber correc- tion factor experimental method and Monte Carlo simulation method in the NIM. The experimental method and the Monte Carlo simulation method are adopted to obtain the correction factor for the medium-energy X-ray primary standard free-air ionization chamber at 100 kV, 135 kV, 180 kV, 250 kV four CCRI reference qualities. The correction factor has already been submitted to the APMP as key comparison data and the results are in good agreement with those obtained in pre- vious studies. This study shows that the experimental method and the EGSnrc simulation method are usually used in the measurement of the correction factor. In particular, the application of the simulation methods is more common.

The Typical Application of Building Energy Consumption Monitoring and Energy Management : A Case Study

Liang Zhao,Ruobing Liang,Jili Zhang 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1

Building energy consumption monitoring and management system plays a vital role in the advance of building energy conservation, because it offers abundant online real time data, which are mainly used to further analyze energy saving potential and put forward a feasibility methodology for implementation. In addition to its extreme importance in decreasing energy consumption and saving costs, the platform can also help to find the anomalies of the main equipment. In this paper, we first introduce the structure of the monitoring platform, and then put forward an error analysis principle to improve the precision of heat meters. A case study is given for a building in “hot summer and cold winter” area, including the installation of various measuring meters and data verification. Finally, the energy consumption data of the building from January to December in 2013 were analyzed.

Creep Fracture Mechanism of a Single Crystal Nickel Base Alloy Under High Temperature and Low Stress

Xiangfeng Liang,Jili Wu,Yutao Zhao 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4

This paper reports the creep behavior of a nickel-based single crystal alloy and the creep fracture mechanism under hightemperature and low stress was discussed. The creep curves were analyzed with the Kelvin model. The retardation spectrasuggest that the involved atoms during creep need more relaxation time to achieve the viscous flow, nevertheless, the creepunder the stress of 120 MPa may be caused by the mismatch of dislocation motion and visco-plastic deformation. The fracturemorphologies of crept alloys indicate that the nickel base single crystal alloy presents micro-pore aggregation fracturemechanism under the condition of high temperature and low stress creep.

A general structural design methodology for multi-hole orifices and its experimental application

Tianyi Zhao,Jili Zhang,Liangdong Ma 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.9

Compared to single-hole orifices (SOs), multi-hole orifices (MOs) have smaller orifice sizes and various patterns of orifice distribution. The geometric description of MOs is more complex, increasing the difficulty of MO structural design. Therefore, it is worthwhile to investigate the key factors affecting MO throttle or flow control characteristics and to develop a general MO design method. This work presents a practical geometric design methodology for MOs and applies this procedure in throttle experiments. To describe the MO geometry in detail, the methodology first introduces a comprehensive set of geometric architectures involving orifice arrangement criteria and geometric parameters such as the total orifice number, n; the orifice distribution density, Dd; and the equivalent diameter ratio, EDR. Then, a series of throttle tests in water flow are conducted to investigate the effect of various geometric features on the pressure loss characteristics of MOs. Finally, a simple model to calculate the pressure loss coefficient of MOs is presented.