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  • 1
    Online Resource
    Online Resource
    Fuzzy sliding mode control of an offshore container crane
    Elsevier BV ; 2017
    In:  Ocean Engineering Vol. 140 ( 2017-08), p. 125-134
    Details
    In: Ocean Engineering, Elsevier BV, Vol. 140 ( 2017-08), p. 125-134
    Type of Medium: Online Resource
    ISSN: 0029-8018
    URL: Article
    DOI: 10.1016/j.oceaneng.2017.05.019
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2017
    detail.hit.zdb_id: 1498543-3
    detail.hit.zdb_id: 160791-1
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  • 2
    Online Resource
    Online Resource
    Ứng dụng công nghệ UAV (drones) theo dõi sinh trưởng và dự báo năng suất lúa tại vùng canh tác lúa tỉnh Hậu Giang
    Can Tho University ; 2023
    In:  Can Tho University Journal of Science Vol. 59, No. ETMD ( 2023-05-19), p. 35-44
    Details
    In: Can Tho University Journal of Science, Can Tho University, Vol. 59, No. ETMD ( 2023-05-19), p. 35-44
    Abstract: Nghiên cứu ảnh hưởng của độ cứng đất và chỉ số khác biệt thực vật chuẩn hóa (NDVI) và chỉ số khác biệt rìa đỏ (NDRE) đến khả năng sinh trưởng và năng suất thực tế (NSTT) của lúa thật sự cần thiết. Trong nghiên cứu này, kiểm định hệ số tương quan Pearson được áp dụng để phân tích sự tương quan giữa các yếu tố. Kết quả nghiên cứu chỉ ra độ cứng đất tăng dần theo độ sâu và phân bố không đều trên đồng; mối quan hệ giữa độ cứng đất tại thời điểm lúa 26 ngày tuổi với sự sinh trưởng và NSTT của lúa chưa được xác định. NDVI và NDRE tăng và giảm đều khi đạt giá trị lớn nhất (0,79-0,86) trong giai đoạn lúa làm đồng. NDVI và NDRE có mối quan hệ cao với năng suất thành phần của lúa, nhưng thấp với chiều cao cây và số chồi lúa. Hai mạng nơron nhân tạo được xây dựng, huấn luyện và kiểm tra theo thuật toán huấn luyện tích hợp trong bộ công cụ của phần mềm Matlab cho kết quả dự đoán NSTT của lúa với độ tin cậy cao.
    Type of Medium: Online Resource
    ISSN: 2815-5599 , 1859-2333
    URL: Article
    DOI: 10.22144/ctu.jvn.2023.027
    Language: Unknown
    Publisher: Can Tho University
    Publication Date: 2023
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  • 3
    Online Resource
    Online Resource
    Unmanned aerial vehicle imaging application for crop health in rice field
    Viet Nam National University Ho Chi Minh City ; 2022
    In:  Science & Technology Development Journal - Engineering and Technology ( 2022)
    Details
    In: Science & Technology Development Journal - Engineering and Technology, Viet Nam National University Ho Chi Minh City, ( 2022)
    Abstract: Precision agriculture is now a topic that attracts many researchers due to the important of food security. In this topic, using the Unmmaed Aerial Vehicle (UAV) for pesticides, monitoring and mapping are under consideration. In addition, the combination of UAV and multi-spectral camera for imaging has been extensively used for vegetation mapping in the farm. This paper aims to introduce a method for mapping fields by using the multispectral camera mount on an UAV. Ariel images have been captured by multi-spectral Sentera camera mounted on Phantom 4 Pro. Successive images, including the NDVI spectral images and NDRE spectral images with GPS information, are the output of the Sentera camera. A combination of the UAV imaging and image processing techniques were used to create the rice planting area mapping. Agisoft software was used to create the Ortho-mosaic images of NDVI spectral image and NDRE spectral image. After that, digital maps contain information about Normalised Difference Vegetation Index (NDVI) and Normalised Difference Red-Edge (NDRE) were created. An observation area was created from the map to evaluate crop health by using these indices. This area included both the middle-stage rice field and the dragon fruits farm with cannels. The crop health is validated again by using the RGB aerial image. By comparing the maps and actual survey, the health of the rice fields is able to evaluate and improve the rice cultivation management. It seems that the NDRE value was the best indicator in visualizing the health of the rice field while the NDVI was better for the dragon fruits field. Utilizing these maps, field visits by farmers can be minimized and farmers can concentrate on the diseased location and give appropriate treatment.
    Type of Medium: Online Resource
    ISSN: 2615-9872
    URL: Article
    DOI: 10.32508/stdjet.v5i1.941
    Language: Unknown
    Publisher: Viet Nam National University Ho Chi Minh City
    Publication Date: 2022
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  • 4
    Online Resource
    Online Resource
    Build coconut counting system using image technology
    Can Tho University ; 2022
    In:  Can Tho University Journal of Science Vol. 14, No. 1 ( 2022-03-30), p. 54-61
    Details
    In: Can Tho University Journal of Science, Can Tho University, Vol. 14, No. 1 ( 2022-03-30), p. 54-61
    Abstract: In our country today, the counting of dried coconuts at the production facilities is done manually, takes a lot of time and is not accurate. The goal of this study is to build an automatic, fast and accurate coconut counting system. The study was conducted on the peeled dried coconut fruit with a diameter of 15 cm to 20 cm using image processing technology and open-source computer vision library - OpenCV library. The algorithm includes four main steps. First, determine the object and the background using the Otsu segmentation method. Next, estimate the distance between the background and the object to determine the closest area to the center of the object. Then, find the contour, determine the center and area of the object to reduce the noise. The watershed segmentation algorithm is used to separate overlapping and stacking objects. Finally, count the number of objects contained in the image. In the initial experimental results, the counting system has had an accuracy of over 95% with processing time per image about 75 ms and the counting capacity of the system is over 2000 fruits/hour has confirmed the efficiency of the proposed method.
    Type of Medium: Online Resource
    ISSN: 2815-5602 , 2615-9422
    URL: Article
    DOI: 10.22144/ctu.jen.2022.006
    Language: Unknown
    Publisher: Can Tho University
    Publication Date: 2022
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  • 5
    Online Resource
    Online Resource
    Fuzzy sliding mode control of container cranes
    Springer Science and Business Media LLC ; 2015
    In:  International Journal of Control, Automation and Systems Vol. 13, No. 2 ( 2015-4), p. 419-425
    Details
    In: International Journal of Control, Automation and Systems, Springer Science and Business Media LLC, Vol. 13, No. 2 ( 2015-4), p. 419-425
    Type of Medium: Online Resource
    ISSN: 1598-6446 , 2005-4092
    URL: Article
    DOI: 10.1007/s12555-014-0150-0
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2015
    detail.hit.zdb_id: 2486545-X
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  • 6
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    Online Resource
    Payload pendulation and position control systems for an offshore container crane with adaptive‐gain sliding mode control
    Wiley ; 2020
    In:  Asian Journal of Control Vol. 22, No. 5 ( 2020-09), p. 2119-2128
    Details
    In: Asian Journal of Control, Wiley, Vol. 22, No. 5 ( 2020-09), p. 2119-2128
    Abstract: When container ports are not available for heavy ships, the offshore ship‐to‐ship transfer operation is an alternative method to an inland container terminal. This process is performed between a large container ship and a smaller ship, which is equipped with a container crane, called the mobile harbor or the ship‐mounted crane. The sea‐state condition is a crucial factor in open‐sea operations. The presence of waves, wind, and current disturbances excite the pendulum oscillations of the crane's hanging container. In this study, the problem of payload pendulation and container position for an offshore container crane using an adaptive‐gain sliding mode control (SMC) scheme is investigated. The primary control task during the loading and unloading process is to keep the container in the desired region under the harsh oceanic environment. The proposed control architecture incorporates an adaptive‐gain SMC with a compensation part and a prediction mechanism. Therein, a sliding surface is design to combine the desired sway motion of the payload with the desired trolley trajectory. Furthermore, a varying control gain is proposed in the sliding control, obtained by an adaption law that transitions the system into sliding mode. By constructing an appropriate Lyapunov function, we show that the proposed control law ensures the asymptotic stability of the ship‐mounted crane. Numerical simulations are presented to show the effectiveness and robustness of the proposed control system.
    Type of Medium: Online Resource
    ISSN: 1561-8625 , 1934-6093
    URL: Issue
    URL: Article
    DOI: 10.1002/asjc.v22.5
    DOI: 10.1002/asjc.2124
    Language: English
    Publisher: Wiley
    Publication Date: 2020
    detail.hit.zdb_id: 2438393-4
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  • 7
    Online Resource
    Online Resource
    Biến Chứng Ngoại Khoa Sau Ghép Thận
    Pham Ngoc Thach University of Medicine ; 2022
    In:  Pham Ngoc Thach Journal of Medicine and Pharmacy , No. 1 - Volume 1 ( 2022-3-1)
    Details
    In: Pham Ngoc Thach Journal of Medicine and Pharmacy, Pham Ngoc Thach University of Medicine, , No. 1 - Volume 1 ( 2022-3-1)
    Abstract: Mục tiêu nhằm: Khảo sát đặc điểm lâm sàng, cận lâm sàng bệnh nhân ghép thận và tỉ lệ các biến chứng ngoại khoa sau ghép thận, kết quả điều trị các biến chứng ngoại khoa tại Bệnh viện nhân dân (BVND) 115. Đối tượng và phương pháp nghiên cứu: Hồi cứu mô tả hàng loạt ca. Kết quả: Tuổi trung bình: 43,60 ± 11,97 tuổi (16-76 ) với nam: 220/313 trường hợp (TH) (70,3%) và nữ: 93/313 TH (29,7%). Có 4,2% TH ghép thận lần 2. Lấy thận trái để ghép: 70,6% TH, đặt thận ghép ở hố chậu phải: 94,2% TH. Thận ghép có bất thường mạch máu: 18,21% TH trong đó bất thường ĐM: 11,82%, TM: 6,07% và bất thường cả ĐM và TM: 0,31%. - Biến chứng mạch máu (hẹp chỗ nối): 0,95%, huyết khối TM: 0,63%, chảy máu vết mổ: 0,63%. Biến chứng niệu (rò): 0,31%. Gập cuống thận: 0,31%, Biến chứng tụ dịch Lymphocele: 0,63% được điều trị thành công. Kết luận: Ghép thận tại BVND 115 là hiệu quả, an toàn, tỉ lệ biến chứng ngoại khoa thấp. Abstract Introduction: To evaluate the clinical features of the recipients and the surgical complications of renal transplantation from living donor andresults of treatment at 115 People’s Hospital. Materials and Methods: Retrospective 313 consecutive recipients at 115 People’s Hospital Results: The average age of recipients: 43.60 ± 11.97 years old (16-76 years old), with 220 cases (70.3 %) were male and 93 cases (29.7 %) were female. The second transplant: 4.2% cases, kidney transplant from left kidney: 70.6% cases, Place the transplanted kidney in the right iliac fossa: 94.2% cases. There are 18.21 % had abnormal vascular kidney transplant which abnormal artery is 11.82%, abnormal vein is 6.07% and 0.31% is both. The vascular complications (anastomotic stenosis): 0.95% cases, veinous thrombosis: 0.63% cases, incision bleeding: 0.63% cases. The urologic complications (leak): 0.31%, angulation of the renal peduncle: 0.31% cases, Lymphatic complication: 0.63% with good results of treatment. Conclusions: The kidney transplantation at 115 people’s Hospital is good results, low rate of surgical complications.
    Type of Medium: Online Resource
    ISSN: 2815-6366 , 2815-6366
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.59715/pntjmp.1.1
    DOI: 10.59715/pntjmp
    DOI: 10.59715/pntjmp.1.1.17
    Language: Vietnamese
    Publisher: Pham Ngoc Thach University of Medicine
    Publication Date: 2022
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  • 8
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    Online Resource
    Giant schwannoma on the lower leg: A case report and review of the literature
    Elsevier BV ; 2023
    In:  International Journal of Surgery Case Reports Vol. 109 ( 2023-08), p. 108468-
    Details
    In: International Journal of Surgery Case Reports, Elsevier BV, Vol. 109 ( 2023-08), p. 108468-
    Type of Medium: Online Resource
    ISSN: 2210-2612
    URL: Article
    DOI: 10.1016/j.ijscr.2023.108468
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 2558001-2
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  • 9
    Online Resource
    Online Resource
    Application of Fuzzy Moving Sliding Surface Approach for Container Cranes
    Springer Science and Business Media LLC ; 2021
    In:  International Journal of Control, Automation and Systems Vol. 19, No. 2 ( 2021-02), p. 1133-1138
    Details
    In: International Journal of Control, Automation and Systems, Springer Science and Business Media LLC, Vol. 19, No. 2 ( 2021-02), p. 1133-1138
    Type of Medium: Online Resource
    ISSN: 1598-6446 , 2005-4092
    URL: Article
    DOI: 10.1007/s12555-019-0595-2
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2021
    detail.hit.zdb_id: 2486545-X
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  • 10
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    Online Resource
    Mô phỏng khảo sát chất lượng của hệ thống tìm đường và bám đường cho xe tự hành lái bằng nguyên lý ackermann trên ROS và Gazebo
    Can Tho University ; 2023
    In:  Can Tho University Journal of Science Vol. 59, No. ETMD ( 2023-05-19), p. 63-69
    Details
    In: Can Tho University Journal of Science, Can Tho University, Vol. 59, No. ETMD ( 2023-05-19), p. 63-69
    Abstract: Bài báo này được thực hiện nhằm nghiên cứu xe tự hành lái theo nguyên lý Ackermann. Mô hình xe được xây dựng để mô phỏng hệ thống định vị, tìm đường, bám đường dựa trên Gazebo và Robot Operating System (ROS). Mô phỏng thực hiện dựa trên cấu trúc Cây hành vi và các node được thiết lập trong ROS 2 nhằm đưa xe đến đúng vị trí theo yêu cầu. Kết quả mô phỏng cho thấy giải pháp đề xuất đã đáp ứng tốt hơn so với nguyên lý lái hai bánh chủ động và lái đa hướng khi thực hiện trên địa hình dễ bị trượt và gồ ghề. Kết quả khảo sát cho thấy robot di chuyển đến mục tiêu với độ lệch khoảng cách lớn hơn hoặc bằng 1 m đạt 96% và nhỏ hơn 1 m đạt 79%. Đồng thời, nghiên cứu này có thể làm tiền đề để triển khai mô hình thực tế trên cơ sở định vị bằng hệ thống GPS.
    Type of Medium: Online Resource
    ISSN: 2815-5599 , 1859-2333
    URL: Article
    DOI: 10.22144/ctu.jvn.2023.030
    Language: Unknown
    Publisher: Can Tho University
    Publication Date: 2023
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