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Research on Using IMRT Plan for Preoperative Rectal Cancer Patients

International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2020年第4期9卷 165-177页

作者： Quang Bui Vinh Soai dang Quoc Cuong Bui xuan Toan Hoang Van Truong Vu Radiotherapy Department Hanoi Oncology Hospital Hanoi Vietnam Medicinal Supplies-Medical Physics Division Hanoi Oncology Hospital Hanoi Vietnam

Aims: Research the possibility of using IMRT for rectal cancer patients in preoperative radiotherapy. Methods and Material: The research object is the preoperative radiotherapy plan for rectal cancer patients. The research group made two plans (IMRT, 3DCRT) for each image series of 34 rectal cancer patients who have received preoperative radiotherapy in Hanoi Oncology Hospital;and then compared the dose distribution on PTV, bladder, intestine, femoral bones, the average MU, and QA results of two types of plan. Results: The 95% isodose line and 50% isodose of IMRT plan are closer than those of 3DCRT plan. The average dose of PTV in IMRT plan and 3DCRT plan are 5006 ± 23 cGy and 5036 ± 42 cGy, respectively. The HTCI and HI values of IMRT and 3D plan are 0.97 ± 0.026 and 5.37 ± 1.32;1.00 ± 0.003 and 7.08 ± 0.88. About the dose of organ at risk: The maximum dose, average dose on the right, left femoral head in the IMRT plan are less than those values in the 3DCRT plan (6.2 Gy, 6 Gy, 7.4 Gy, 9 Gy, respectively). The maximum dose and average dose on the bladder of the IMRT plan are smaller than those values of the 3DCRT plan (5.3 Gy, 1.5 times, respectively). The maximum dose and average dose of intestine in the IMRT plan was less than those values in the 3DCRT plan (4.3 Gy, 1.54 times, respectively). The MU number of IMRT plan is 1.5 times bigger than that of 3DCRT plan. Gamma index of IMRT plan is better than that of 3DCRT plan (99% compared with 97%). Conclusions: Using IMRT plan in preoperative radiotherapy for rectal cancer patients can still ensure covered PTV as well as the 3D PLAN. Furthermore, the dose of PTV in the IMRT plan is more uniform than those in the 3D plan, and the dose effect on the OAR surrounding PTV is much lower than when using the 3D plan. When IMRT plan were used to treat the preoperative rectal cancer patients, the LINAC took more time than when using 3DCRT plan.

关键词： Rectal Cancer Preoperative Radiotherapy IMRT HI HTCI Gamma Index

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Bouc-Wen迟滞模型的改进与音圈电机非光滑迟滞特性的描述

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振动与冲击 2010年第9期29卷 82-85,112页

作者：曾思霖党选举张霖桂林电子科技大学电子工程与自动化学院桂林541004 国家软件与集成电路公共服务平台广西分中心桂林541004

Bouc-Wen模型是基于非线性微分方程的一种迟滞模型,由于三角波等非光滑输入拐点处导数不存在,此模型无法适应此类非光滑输入信号。受信号预处理方法启发,基于不完全微分的柔化思想,对Bouc-Wen迟滞模型进行了改进,论述了其对音圈电机非... 详细信息

Bouc-Wen模型是基于非线性微分方程的一种迟滞模型,由于三角波等非光滑输入拐点处导数不存在,此模型无法适应此类非光滑输入信号。受信号预处理方法启发,基于不完全微分的柔化思想,对Bouc-Wen迟滞模型进行了改进,论述了其对音圈电机非光滑迟滞特性描述的合理性,给出了改进模型的离散形式。在三角波输入下,对原模型和改进模型传输特性进行了仿真比较。结果表明,改进Bouc-Wen模型克服了原模型不足,能有效描述迟滞特性,可实现性好,算法简洁,特别符合高速实时要求。

关键词：音圈电机 Bouc-Wen迟滞模型非光滑不完全微分

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补体系统及其糖基化

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生物化学与生物物理进展 2017年第10期44卷 888-897页

作者：赵菲党刘毅赵璇李可 Leibniz Institute for Natural Product Research and Infection Biology 西安交通大学第二附属医院 Department of Molecular Biotechnology Ghent University 商洛市中心医院检验科

补体系统是固有免疫系统的重要组成部分,同时也是连接固有免疫和适应性免疫系统的重要桥梁.补体系统由30多种蛋白质组成,且其中绝大多数都经过糖基化修饰.近年来对补体系统的研究,不断揭示出补体系统在抗击病原微生物入侵和维持有机体... 详细信息

补体系统是固有免疫系统的重要组成部分,同时也是连接固有免疫和适应性免疫系统的重要桥梁.补体系统由30多种蛋白质组成,且其中绝大多数都经过糖基化修饰.近年来对补体系统的研究,不断揭示出补体系统在抗击病原微生物入侵和维持有机体生理稳态过程中发挥着重要作用.然而补体系统需要严格的调控,不论是激活不足、抑或是过度激活都可能引起疾病的发生.本文概述了近年来对于补体系统的激活、调控和功能研究的最新进展,并首次从糖生物学角度对补体系统蛋白质组分的糖链结构及糖链对相应蛋白质功能的影响进行了综述和小结.

关键词：补体糖基化糖蛋白调控 H因子

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Analyzing Planning Techniques for Whole Brain Radiotherapy

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2020年第1期9卷 1-13页

作者： Soai dang Quoc Quang Bui Vinh Cuong Bui xuan Toan Hoang Van Truong Vu Medicinal Supplies Medical Physics Division Hanoi Oncology Hospital Hanoi Vietnam Radiotherapy Department Hanoi Oncology Hospital Hanoi Vietnam

Aims: This study compares data between the Field in Field planning and Wedge planning techniques to figure out which technique has better dose coverage and distribution for PTV, and, if using FiF technique for whole brain treatment, how many beams will have better plan. Methods: 56 patients, who need to radiate whole brain with 30 Gy/10 fractions, have been selected for this study. Four plans have been made for each patient (FiF1—one subfield per field plan, FiF2—two subfields per field plan, FiF3—three subfields per field plan, and a Wedge plan). Results: The results of Field in Field plans including Compare dose distribution on the transverse CT slice, plan evaluation using DVH, number MU of plan, Dmax, HI, HTCI, DmaxPTV, DmeanPTV. Volume of PTV with the dose over 105% prescribed dose, dose of organ at risk, and Quality Assurance (QA) plan, are better than those of Wedge plan. Conclusions: Plans using Field in Field technique has better coverage, is more homogeneous in dose distribution than plan using Wedge technique. When using Field in Field technique for whole brain radiotherapy, using three subfields per field has better result than two subfields per field and one subfield per field.

关键词： Field in Field Whole Brain Radiotherapy HI HTCI Gamma Index

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Comparative Study of Streamers＇ Characteristics in Different Seed Based Insulating Oils under Lightning Impulse Voltages

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Journal of Energy and Power Engineering 2014年第4期8卷 735-740页

作者： Abderrahmane Beroual1 Viet-hung dang Essam Al-Ammar Muhammad Iqbal Qureshi Laboratoire Ampere-CNRS UMR 5005 Ecole Centrale de Lyon University of Lyon Ecully 69130 France Saudi Aramco Chair in Electrical Power Department of Electrical Engineering King Saud University Riyadh 11421 Saudi Arabia

This paper is aimed at the streamers in natural esters （vegetable oils） in point--plane electrode arrangement under lightning impulse voltage. The shape, stopping length, velocity and current of streamers are investigated. Six untreated commercial oils extracted from grape seeds, sunflower and rape seeds, corn, rice and sesame that could constitute potential liquids for high voltage applications are tested. A naphthenic mineral oil is also tested for comparison. It＇s shown that the streamers are filamentary for both polarities. For a given voltage, the stopping lengths （Lf） of streamers are longer when the point is positive than when it is negative; also, except mineral oil when the point is negative, the values of Lf-are very close in all tested oils. The streamers＇ velocities are in the same range for all vegetable oils and they vary between 0.4 km/s and 1.2 km/s for positive polarity and 0.2 km/s and 0.8 km/s for negative polarity.

关键词： Natural esters mineral oil streamer shape stopping length streamer velocity streamer current.

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无词典中文特征词自动抽取的桥接模式滤除算法

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计算机应用研究 2007年第7期24卷 168-170页

作者：宣照国党延忠大连理工大学系统工程研究所辽宁大连116023

提出一种不依赖于词典的抽取文本特征词的桥接模式滤除算法(BPFA)。该算法统计文本中的汉字结合模式及其出现频率,通过消除桥接频率得到模式的支持频率,并依此来判断和提取正确词语。实验结果显示,BPFA能够有效提高分词结果的查准率和... 详细信息

提出一种不依赖于词典的抽取文本特征词的桥接模式滤除算法(BPFA)。该算法统计文本中的汉字结合模式及其出现频率,通过消除桥接频率得到模式的支持频率,并依此来判断和提取正确词语。实验结果显示,BPFA能够有效提高分词结果的查准率和查全率。该算法适用于对词语频率敏感的中文信息处理应用,如文本分类、文本自动摘要等。

关键词：自动分词桥接模式滤除算法中文信息处理

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Ecoregional variations of aboveground biomass and stand structure in evergreen broadleaved forests

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Journal of Forestry Research 2020年第5期31卷 1713-1722页

作者： Tran Van Do Mamoru Yamamoto Osamu Kozan Vo Dai Hai Phung Dinh Trung Nguyen Toan Thang Lai Thanh Hai Vu Thanh Nam Trieu Thai hung Hoang Van Thang Tran Duc Manh Cao Chi Khiem Vu Tien Lam Nguyen Quang hung Tran Hoang Quy Pham Quang Tuyen Trinh Ngoc Bon Nguyen Thi Thu Phuong Ninh Viet Khuong Nguyen Van Tuan dang Thi Hai Ha Tran Hai Long dang Van Thuyet dang Thinh Trieu Nguyen Van Thinh Tran Anh Hai Duong Quang Trung Nguyen Van Bich Dinh Hai dang Pham Tien Dung Nguyen Huy Hoang Le Thi Hanh Phan Minh Quang Nguyen Thi Thuy Huong Hoang Thanh Son Nguyen Thanh Son Nguyen Thi Van Anh Nguyen Thi Hoai Anh Pham Dinh Sam Hoang Thi Nhung Hoang Van Thanh Nguyen Huu Thinh Tran Hong Van Ho Trung Luong Bui Kieu hung Research Institute for Sustainable Humanosphere Kyoto UniversityUjiKyotoJapan Silviculture Research Institute Vietnamese Academy of Forest SciencesNorth Tu LiemHanoiVietnam Center for Southeast Asian Studies Kyoto UniversityKyotoJapan Vietnamese Academy of Forest Sciences North Tu LiemHanoiVietnam Vietnam Administration of Forestry No.2 Ngoc HaBa DinhHanoiVietnam

Biotic and abiotic factors control aboveground biomass(AGB)and the structure of forest *** study analyses the variation of AGB and stand structure of evergreen broadleaved forests among six ecoregions of Vietnam.A data set of 1731-ha plots from 52 locations in undisturbed old-growth forests was *** results indicate that basal area and AGB are closely correlated with annual precipitation,but not with annual temperature,evaporation or hours of *** area and AGB are positively correlated with trees>30 cm *** areas surveyed(52.6%)in these old-growth forests had AGB of 100–200 Mg ha^-1;5.2%had AGB of 400–500 Mg ha^-1,and 0.6%had AGB of>800 Mg ha^-*** percent of the areas surveyed had stand densities of 300–600 ***^-1,and 64%had basal areas of 20–40 m^2 ha^-*** is an important factor influencing the AGB of old-growth,evergreen broadleaved forests in *** causing the loss of large-diameter trees(e.g.,>100 cm DBH)affects AGB but may not seriously affect stand density.

关键词： Aboveground biomass Carbon storage Climatic variables Ecoregion Edaphic variables Oldgrowth forest

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Cost Optimization of Surface Grinding Process

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Journal of Environmental Science and Engineering(A) 2016年第12期5卷 606-611页

作者： Vu Ngoc Pi Luu Anh Tung Le xuan hung Banh Tien Long Thai Nguyen University of Technology Thai Nguyen 23000 Vietnam Ha Noi University of Technology Ha Noi 100000 Vietnam

This paper introduces a new study on cost optimization of surface grinding. In the study, the effects of grinding parameters including the dressing regime parameters, the wheel life and the initial grinding wheel diameter on the exchanged grinding wheel diameter which were investigated. In addition, the influence of cost parameters including the machine tool hourly rate and the grinding wheel cost were taken into account. In order to find the optimum exchanged grinding wheel diameter, a cost optimization problem was built. From the results of the optimization problem, a model for determination of the optimum exchanged grinding wheel diameter was found. By using the optimum diameter, both the grinding cost and grinding time can be reduced significantly.

关键词： Grinding grinding process surface grinding cost optimization.

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Cost Optimization of Internal Grinding

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材料科学与工程（中英文B版） 2016年第6期6卷 291-296页

作者： Vu Ngoc Pi Le xuan hung Luu Anh Tung Banh Tien Long Thai Nguyen University of Technology Thai Nguyen 23000 Vietnam Ha Noi University of Technology Ha Noi 100000 Vietnam

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高频响应下音圈电机复杂迟滞特性建模与验证

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振动与冲击 2012年第9期31卷 107-112页

作者：党选举王占军杨大磊桂林电子科技大学电子工程与自动化学院桂林541004

为实现音圈电机(Voice Coil Motor,VCM)在高频、高速、高加速情况下的精确定位控制,针对引起音圈电机产生振动、系统不稳定等问题的特殊复杂迟滞特性,建立其复杂迟滞模型。改进C-S迟滞模型,提出C-S神经网络混合动态复杂迟滞模型;用音圈... 详细信息

为实现音圈电机(Voice Coil Motor,VCM)在高频、高速、高加速情况下的精确定位控制,针对引起音圈电机产生振动、系统不稳定等问题的特殊复杂迟滞特性,建立其复杂迟滞模型。改进C-S迟滞模型,提出C-S神经网络混合动态复杂迟滞模型;用音圈电机的两组实测数据验证模型的有效性。实验结果为:音圈电机工作在低频、低速、低加速时(10 Hz)表现出一般的迟滞特性,这时建模的最大误差为4.8μm,是最大输出值的0.48%,表明该方法能够有效地补偿音圈电机一般的迟滞特性;音圈电机工作在高频、高速、高加速时(40 Hz)表现出特殊的复杂迟滞特性,其建模的最大误差为6μm,是最大输出值的0.97%。说明该方法能够满足复杂迟滞特性建模的要求。

关键词：音圈电机复杂迟滞神经网络 C-S模型非单调

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