A Risk Prediction Model for Invasive Fungal Disease in Critically Ill Patients in the Intensive Care Unit

Fangyi Li,Minggen Zhou,Zijun Zou,Weichao Li,Canxia Huang,Zhijie He 한국간호과학회 2018 Asian Nursing Research Vol.12 No.4

Purpose: Developing a risk prediction model for invasive fungal disease based on an analysis of the disease-related risk factors in critically ill patients in the intensive care unit (ICU) to diagnose the invasive fungal disease in the early stages and determine the time of initiating early antifungal treatment. Methods: Data were collected retrospectively from 141 critically ill adult patients with at least 4 days of general ICU stay at Sun Yat-sen Memorial Hospital, Sun Yat-sen University during the period from February 2015 to February 2016. Logistic regression was used to develop the risk prediction model. Discriminative power was evaluated by the area under the receiver operating characteristics (ROC) curve (AUC). Results: Sequential organ failure assessment (SOFA) score, antibiotic treatment period, and positive culture of Candida albicans other than normally sterile sites are the three predictors of invasive fungal disease in critically ill patients in the ICU. The model performs well with an ROC-AUC of .73. Conclusion: The risk prediction model performs well to discriminate between critically ill patients with or without invasive fungal disease. Physicians could use this prediction model for early diagnosis of invasive fungal disease and determination of the time to start early antifungal treatment of critically ill patients in the ICU.

Modulation of the lattice structure of 2D carbon‑based materials for improving photo/electric properties

Fangyi Li,Yulianti Anjarsari,Jiamei Wang,Rifda Azzahiidah,Jizhou Jiang,Jing Zou,Kun Xiang,Huijuan Ma,Arramel 한국탄소학회 2023 Carbon Letters Vol.33 No.5

Reliable, inexpensive, environment-friendly, and durable properties of carbon materials with unique and outstanding photoelectric performance is highly desired for myriad of applications such as catalysis and energy storage. Since lattice modulation is a vital method of surface modification of materials, which form by an external force during the synthesis process, causing the internal compression and stretching, leading to lattice sliding event. In this review, we present a summary of different methods to tailor the lattice modulation in 2D carbon-based materials, including grain/twin boundary, lattice strain, lattice distortion, and lattice defects. This overview highlights the implication control of the diverse morphologies of nanocrystals and how to tailor the materials properties without adding any polymers. The improvement in the performance of 2D carbon materials ranges from the enhancement of charge transport and conductivity, structural stability, high-performance of light absorption capacity, and efficient selectivity promote the future prospect of 2D carbon materials broaden their applications in terms of energy conversion and storage. Finally, some perspectives are proposed on the future developments and challenges on 2D carbon materials towards energy storage applications.

해수강애문(海水江崖纹)의 고찰과 현대적 응용을 위한 분석 연구

이방의(Li, Fangyi),이형규(Lee, Hyung Kyu) 한국디자인문화학회 2023 한국디자인문화학회지 Vol.29 No.4

약 5000년, 중국의 역사에는 다양한 신화가 있을 뿐만 아니라 화려한 토템과 다양한 문양이 있다. 해수강애문은 중국 전통문양 중의 하나로서 명나라⋅청나라시기의 복장에서 성행하였으며 산문과 수문으로 구성된다. 해수강애문은 현대 디자인의 장식 문양에서 매우 광범위하게 응용되고 있으나, 장신구에는 거의 적용되지 않는다. 그리하여 전통문양인 해수강애문과 장신구의 결합을 체계적으로 설계하는 연구가 필요한 시점이다. 본 연구는 해수강애문의 예술적 특징 및 문화적 내용을 매듭짓고 문양의 특징을 기반으로 현대 장신구 디자인에 응용한다. 다양한 경로를 통해 수집한 관련 문헌을 중심으로 해수강애문의 기원과 발전을 연구하고 시기별 해수강애문의 형태와 색채의 특징을 자세히 분석한다. 해수강애문을 주제로 장신구 디자인의 원칙을 제시하고 문양의 추출, 변형 및 재구성에 대하여 탐색한다. 연구의 구성내용과 디자인 사례를 비교하고 분석하고 가치가 있고 의미 있는 요소들을 뽑아낸다. 본 연구의 결과 해수강애문을 현대 디자인 기법으로 실현하는 것은 문양이 가진 외형적 아름다움을 재현할 뿐만 아니라 문양에 내재된 문화적 가치까지 표현할 수 있음 확인할 수 있었다. 전통문양을 계승하고 재현하는 것은 현대 디자인의 또 다른 숙제라 할 수 있다. 그러한 측면에서 본 논문이 해수강애문을 응용한 장신구 디자인 연구에서 가치 있는 기초자료가 되기를 바란다. Approximately 5,000 years ago, China’s history not only has various myths, but also colorful totems and various patterns. Sea and river cliff pattern is one of the traditional Chinese patterns and was popular in the clothing of the Ming and Qing Dynasties. It consists of a mountain pattern and a water pattern. Sea and river cliff patterns are widely applied in decorative patterns in modern design, but are rarely applied to jewelry. Therefore, the sea and river cliff patterns combined with traditional patterns and accessories are studied. This study concludes the artistic characteristics and cultural content of the sea and river cliff pattern and applies it to modern jewelry design based on the characteristics of the pattern. The origin and development of sea and river cliff pattern is studied based on various related literature, and the form and color characteristics of sea and river cliff pattern by period are analyzed in detail. The principles of jewelry design are presented under the theme of sea and river cliff pattern, and the extraction, transformation, and reconstruction of patterns are explored. Compare and analyze research composition and design cases and extract valuable and meaningful elements. As a result of this study, it was confirmed that realizing the sea and river cliff pattern using modern design techniques not only reproduces the external beauty of the pattern, but also expresses the cultural value inherent in the pattern. Inheriting and reproducing traditional patterns can be said to be another task of modern design. In that respect, I hope that it will serve as basic data for more active research on jewelry design using sea and river cliff pattern.

A Novel Vibration Model for Explanation of the Frequency Features in Multistage Wind Turbine Gearboxes Considering the Effects of Inter-stage Meshing Frequency Modulation

Yanyan Nie,Fangyi Li,Liming Wang,Jianfeng Li,Yanle Li,Mingshuai Sun,Mengyao Wang,Guoyan Li 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.10 No.1

As a kind of green energy, wind energy has become cost-competitive mainstream energy in the world. The gearbox is one of the most important and vulnerable components in the wind turbine (WT), which suffers a high failure rate and downtime. It is of great significance to the condition monitoring and fault diagnosis of the WT gearbox. However, in the multistage WT gearbox, the vibrations generated from different stages are coupled, which leads to a complex vibration spectral structure and brings difficulties in condition monitoring and fault diagnosis. Aiming to understand the vibration frequency features of multistage WT gearboxes, a novel phenomenological vibration model is established and the spectral structure is deduced by using the Fourier series analysis. In the vibration model, the phenomenon of inter-stage meshing frequency modulation (ISMFM) is considered, which is clearly proposed for the first time. The theoretical derivations are validated by both simulation and engineering tests using a 2.0 MW industrial WT gearbox. The results show that under healthy conditions, in addition to the meshing frequencies and their harmonics of each stage, there are also ISMFM sidebands in the vibration spectrum of the multistage WT gearbox, and the amplitude of the sidebands will change with the health status of the gearbox. The findings are not only applicable to the WT gearbox studied in this paper, but also to other similar multistage gearbox systems, which can provide a priori spectral structure for a multistage gear transmission system to assist its condition monitoring and fault diagnosis.

Recent advances of MXenes Mo2C‑based materials for efficient photocatalytic hydrogen evolution reaction

Jiamei Wang,Qin Qin,Fangyi Li,Yulianti Anjarsari,Wei Sun,Rifda Azzahiidah,Jing Zou,Kun Xiang,Huijuan Ma,Jizhou Jiang,Arramel 한국탄소학회 2023 Carbon Letters Vol.33 No.5

The emergence of Mo2C- based catalysts in recent years has been favored as promising contender within diverse class MXenes. In terms of rapid development in the photocatalytic application, these intriguing compounds exhibit excellent photocatalytic performance because of their superior optical properties and peculiar structure characteristics. Unfortunately, a systematic review of Mo2C- based catalysts is lacking. In this review, we abstract the implication of structure—property relationship of emerging Mo2C- based MXenes materials and their applications toward the photocatalytic hydrogen evolution reaction (HER). Furthermore, synthetic pathways to prepare high-quality, low cost Mo2C- based MXenes materials and their outcomes for high HER applications are systematically described. Finally, several insights are provided into the prospects and future challenges for the development of highly reactive Mo2C- based MXenes materials, which present large range opportunities in this promising 2D materials for green and clean energy in environmental fields. This review provides a comprehensive scientific guide to the preparation, modification, and photocatalytic HER of MXenes-based materials.

An Optimized Multi-load Wireless Power Transfer System with Constant Load Currents

Zhe Zhou,Weiguo Li,Chenwen Cheng,Zhanfeng Deng,Fangyi Li,Qiuyu Shi,Chris Mi 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

This paper proposes a multi-load wireless power transfer (WPT) system using repeater coils. The repeater unit that contains two repeater units is designed. The series-parallel-series (SPS) compensation method is used for each repeater unit. The constant load current for all the loads can be obtained with suitable resonant condition when neglecting the coils’ parasitic resistances. A feasible coil structure is designed where the two repeater coils in the same repeater unit are both bipolar that are placed perpendicularly so that the coupling between them can be neglected. A ferrite plate is inserted between the two bipolar coils in each repeater unit to enhance the magnetic coupling between adjacent units. Moreover, the proposed system has been optimized so that the system efficiency can be improved. The simulation results are given to validate the effectiveness of the proposed WPT system.

Phenomenological Modeling of Vibration Signal and Analyzing of Modulation Mechanisms in Multi-Stage Wind Turbine Gearboxes

Yanyan Nie,Jianfeng Li,Liming Wang,Fangyi Li 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11