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High-Performance Supercapacitor based on the NaOH Activated D-Glucose Derived Carbon
Chao Wu,Jiang Xu,Jianning Ding,Ningyi Yuan,Pengtao Yan,Ruijun Zhang,Huihan Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.7
In this work, a mechanism of catalytic graphitization of D-glucose derived carbon during NaOH activation process is disclosed. The catalytic graphitization is caused by sodium atom, which is produced in the reaction between NaOH and carbon. Due to the combined action of activation and catalytic graphitization resulting from the NaOH, the activated D-glucose derived carbon behaves as a hierarchical micro- and meso-porous structure and has high electrical conductivity. Electrochemical investigations demonstrate that the activated sample exhibits an outstanding rate capability (70% of capacity retention even at a scan rate of 2 V s-1) and high specific capacitance (106 F g-1) in 6 M KOH aqueous electrolyte, which makes it a promising electrode material for high-power supercapacitors.
Wu, Chao,Li, Fang,Jiao, Shun-Chang Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.10
The objective of this retrospective study was to investigate prognostic factors associated with survival of patients with extensive stage small cell lung cancer (ES-SCLC). Included were 200 patients admitted to the Liberation Army General Hospital with a diagnosis of ES-SCLC. The demographics of patients, disease characteristics, pre-treatment biochemical parameters and therapeutic plan were assessed or evaluated. Univariate analysis found that second-line chemotherapy, radiotherapy, and no liver metastasis were associated with improved survival. Tumor response to first-line chemotherapy and normal initial hemoglobin levels were also associated with a survival benefit (all P-values ${\leq}$ 0.0369). Multivariate Cox regression analysis indicated that liver metastasis and the total number of all chemotherapy cycles were independent prognostic factors of survival. The morbidity risk in patients with liver metastasis was 2.52-fold higher than that in patients without liver metastasis (hazard ratio (HR)=2.52 (1.69-3.76); P<0.0001). However, one unit increase in the total number of chemotherapy cycles decreased the risk of death by 0.86-fold (HR=0.86 (0.80-0.92); P<0.0001). Absence of liver metastasis and ability of a patient to receive and tolerate multiple lines of chemotherapy were associated with longer survival.
Chao-bin Wang,Hui Wang,Jun-shuang Zhao,Ze-jun Wu,Hao-dong Liu,Chao-jia Wang,An-rong Li,Dawei Wang,Juntao Hu 대한신경외과학회 2023 Journal of Korean neurosurgical society Vol.66 No.5
Penetrating head injury is a serious open cranial injury. In civilians, it is often caused by non-missile, low velocity flying objects that penetrate the skull through a weak cranial structure, forming intracranial foreign bodies. The intracranial foreign body can be displaced due to its special quality, shape, and location. In this paper, we report a rare case of right-to-left displacement of an airgun lead bullet after transorbital entry into the skull complicated by posttraumatic epilepsy, as a reminder to colleagues that intracranial metal foreign bodies maybe displaced intraoperatively. In addition, we have found that the presence of intracranial metallic foreign bodies may be a factor for the posttraumatic epilepsy, and their timely removal appears to be beneficial for epilepsy control.
Dynamic modeling method for active magnetic bearings-rotor system of steam turbines
Chao Wu,Zhenzhong Su,Dong Wang,Hao Jiang 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.4
As oil-free rotor support technology, active magnetic bearings (AMBs) are increasingly applied in turbinmachinery, including steam turbines. The compact multiple disksrotor bearing system of maglev steam turbines leads to complicated dynamic behaviors, which is the basis of AMBs controllers design. In this paper, an analytical modeling method is proposed to describe the dynamic characteristics of AMBs-rotor system of maglev steam turbines. The analytic rotor dynamic model consists of multiple rigid disks on a flexible shaft and AMBs. In modeling the rotor bearing system, the flexible shaft is discretized by Euler Bernoulli beam elements. The connection between rigid disks and flexible shaft is equivalent to spring dampers. Angular stiffness and angular damping coefficients are introduced to model the spring dampers and identified by 3D finite element simulation results. The bearings force takes the control system of AMBs into consideration. Moreover, experiments of a test rig are carried out. The results show that the proposed analytical rotor dynamic modeling method is effective.
A Practical Model for ICT-Integrated Music Education
Chao-Kuei Wu 한국문화교육학회 2012 문화예술교육연구 Vol.7 No.1
This paper aims to develop a practical model for better enactment of ICT integration and music in Taiwan. Currently, the progress of Information and Communication Technology (ICT) has changed the way music is experienced. ICT is presented as an efficient tool to enhance students’ attainment of listening, composition, performance, improvising, or music appreciation. Nevertheless, a growing body of evidence claims that the lack of funding, provision, teaching resource, or capability of employing ICT has restricted music teachers in developing new curriculum ICT use. In 1998, the Ministry of Education in Taiwan released a policy that encourages Grades 1-9 school educators to integrate ICT into all curricula. In order to explore more closely the enactment of integrating ICT into music curriculum, a qualitative single case study with multiple methods including observation, interview, and document analysis was conducted for four months at one ICT-Seeded junior high school in central Taiwan. Rather than the lack of ICT funding or equipment, the findings indicate that providing music teachers required support and training should be focused in future. Finally, a 'Staffing and Provision Model' is proposed to inform better implementation of ICT integration and music in Taiwan. 本文旨在發展一個改進台灣資訊融入音樂教育運作的實用模式。近年來資訊通訊科技已經改變體驗音樂的方式,且被認為是提升學生聽力、作曲、演奏、即興與欣賞成就最有效的工具。儘管如此卻有研究顯示推行資訊融入音樂教學所匱乏的經費、設備、教學資源及設備操作能力已經影響音樂教師使用資訊科技發展新課程設計的意願。1998年台灣教育部發佈政策,鼓勵國中小學校教師將資訊科技融入各科教學中,因此為深入了解資訊融入音樂教學的實施狀況,本研究利用實地觀察、訪談與文件分析等質性研究方法,針對台灣中部一所資訊融入教學種子學校進行個案研究。研究結果顯示在台灣經費跟設備因素對資訊融入音樂課程發展的影響較少,反而是對音樂教師在課程設計上所需要的技術支持與訓練在未來要更加重視。最後則根據研究結果,提出一個實用模式(SP Model)做為改進台灣資訊融入音樂課程的建議。
Partial Discharge Detection Method Based on DD-DT CWT and Singular Value Decomposition
Wu Chao,Gao Yiran,Wang Ruoyan,Wang Kai,Liu Siyang,Nie Yongjie,Wang Ping 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4
Partial discharge (PD) detection is signifi cant for insulation condition evaluation of electrical equipment. However, it often happens that the PD signals are submerged by interferences, which will cause the inaccurate detection results. In this paper, we propose a PD detection method based on double-density dual-tree complex wavelet transform (DD-DT CWT) and singular value decomposition (SVD) to solve this problem. The denoising method based on DD-DT CWT has better performance in both removing interferences and retaining features of PD signals. The inner product of the singular value matrix obtained by applying SVD to denoised high-frequency wavelet coeffi cient matrix can concisely represent the complexity of the tested signal, which can be used as a basis to judge the existence of the PD signal. Besides, Otsu algorithm is introduced to calculate the threshold to locate the appearance time of the PD signal. Experimental results show that the proposed method can detect the PD signal with the accuracy rate of 77.8% when PD signals are submerged by noises, while the traditional method cannot detect the existence of the PD signal. In addition, only the method proposed in this paper can detect the appearance time of the PD signal with the accuracy rate of 97.2%.
A Simple Reversible Watermarking Scheme Based on Difference Expansion
Chao-Ming Wu,Cheng-Kang Wu,Houshou Chen 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
A simple reversible watermarking scheme based on block-wise difference expansion is proposed. Pixels in a block are expanded with respect to a common reference point. The maximum capacity will exceed 0.5 bpp if the block size is larger than 2. According to local variances of the reference points, blocks introducing small distortion by difference expanding are selected firstly to embed watermark. In Tian’s difference expansion algorithm, the embedding of the location map causes large overhead cost, apparently in low payload region. A good lossless compression algorithm is required to reduce this cost but the complexity is increased. In the proposed algorithm, a simple all 0 pattern is used to distinguish between non-expandable and expandable blocks. In this way, the location map is no longer necessary and the complexity of the scheme will be reduced.