ON THE GENERALIZED CONVOLUTION WITH A WEIGHT-FUNCTION FOR THE FOURIER COSINE, MELLIN AND FOURIER SINE INTEGRAL TRANSFORMS

Joint Research on Environmental Science and Technology for the Eart

An Image-Based Rice Weighing Estimation Approach on Clock Type Weighing Scale Using Deep Learning and Geometric Transformations

AI impacts surrounding human life, such as the economy, health, education, and agricultural production; however, the crop prices in the harvest season are still on manual calculation, which causes doubts about accuracy. In this study, an image-based approach is proposed to help farmers calculate rice prices more accurately. YOLOv5 is used to detect and extract the scales in the images taken from the harvesting of rice crops. Then, various image processing techniques, such as brightness balance, background removal, etc., are compiled to determine the needle position and number on the extracted scale. Lastly, geometric transformations are proposed to calculate the weight. A real dataset of 709 images is used for the experiment. The proposed method achieves good results in terms of [email protected] at 0.995, mAP@[0.5:0.95] at 0.830 for scale detection, and MAE at 3.7 for weight calculation

VBD-MT Chinese-Vietnamese Translation Systems for VLSP 2022

We present our systems participated in the VLSP 2022 machine translation shared task. In the shared task this year, we participated in both translation tasks, i.e., Chinese-Vietnamese and Vietnamese-Chinese translations. We build our systems based on the neural-based Transformer model with the powerful multilingual denoising pre-trained model mBART. The systems are enhanced by a sampling method for backtranslation, which leverage large scale available monolingual data. Additionally, several other methods are applied to improve the translation quality including ensembling and postprocessing. We achieve 38.9 BLEU on ChineseVietnamese and 38.0 BLEU on VietnameseChinese on the public test sets, which outperform several strong baselines

MÔ PHỎNG PHÂN BỐ VÀ KHẢ NĂNG CHỊU TẢI ĐỐI VỚI CHẤT LƠ LỬNG KHU VỰC ĐẦM CẦU HAI - TỈNH THỪA THIÊN-HUẾ BẰNG MÔ HÌNH TOÁN

By applying of regression methods to assimilate data for suspended particulate matter as the input data to mathematical model, the paper presents the results on the distribution and carrying capacity of suspended particulate matter in Cau Hai lagoon, Thua Thien-Hue province during the dry season (7/2013) and rainy season (10/2013). The initial simulation show that the water exchange in Cau Hai lagoon is weak in comparsion with that in Thuy Tu lagoon as well as Tam Giang lagoon, leading the distribution of suspended particulate matter to be dominated by seasonal and the suspended particulate matter from Truoi river. The overall mean concentration of suspended particulate matter is 30 g/m3 during dry season and 48 g/m3 in the rainy season. Notably, the carrying capacity of suspended particulate matter in Cau Hai lagoon is very low in the rainy season, with the remaining capacity of receiving being only 4%. Therefore, a small increase in the suspended particulate matter can result in the overload of suspended particulate matter in Cau Hai region.Ứng dụng phương pháp hồi quy đơn trong việc đồng hóa số liệu đối với chất lơ lửng làm đầu vào cho mô hình toán, bài báo đã đưa ra những kết quả về phân bố và khả năng chịu tải chất lơ lửng tại khu vực đầm Cầu Hai tỉnh Thừa Thiên-Huế trong mùa khô (7/2013) và mùa mưa (10/2013). Các kết quả mô phỏng ban đầu cho thấy, sự trao đổi nước trong khu vực đầm Cầu Hai là yếu so với sự trao đổi nước ở đầm Thủy Tú cũng như đầm Tam Giang, dẫn tới sự phân bố chất lơ lửng trong đầm chủ yếu bị chi phối theo mùa và phụ thuộc vào nguồn chất lơ lửng từ sông Truồi đưa ra. Hàm lượng chất lơ lửng trung bình toàn đầm đạt 30 g/m3 vào mùa khô và 48 g/m3 vào mùa mưa. Đáng chú ý là khả năng chịu tải chất lơ lửng đối với đầm Cầu Hai trong mùa mưa là rất thấp, khả năng tiếp nhận chỉ còn 4%. Bởi vậy chỉ cần một tác động nhỏ làm gia tăng hàm lượng chất lơ lửng vào đầm cũng dẫn đến kết quả quá tải chất lơ lửng trong khu vực đầm Cầu Hai

Speed profile optimization of an electrified train in Cat Linh-Ha Dong metro line based on pontryagin's maximum principle

An urban railway is a complex technical system that consumes large amounts of energy, but this means of transportation still has been obtained more and more popularity in densely populated cities because of its features of high-capacity transportation capability, high speed, security, punctuality, lower emission, reduction of traffic congestion. The improved energy consumption and environment are two of the main objectives for future transportation. Electrified trains can meet these objectives by the recuperation and reuse of regenerative braking energy and by the energy - efficient operation. Two methods are to enhance energy efficiency: one is to improve technology (e.g., using energy storage system, reversible or active substations to recuperate regenerative braking energy, replacing traction electric motors  by energy-efficient traction system as permanent magnet electrical motors; train's mass reduction by lightweight material mass...); the other is to improve operational procedures (e.g. energy efficient driving including: eco-driving; speed profile optimization; Driving Advice System (DAS); Automatic Train Operation (ATO); traffic management optimization...). Among a lot of above solutions for saving energy, which one is suitable for current conditions of metro lines in Vietnam. The paper proposes the optimization method based on Pontryagin's Maximum Principle (PMP) to find the optimal speed profile for electrified train of Cat Linh-Ha Dong metro line, Vietnam in an effort to minimize the train operation energy consumption

Batrachochytrium salamandrivorans is the predominant chytrid fungus in Vietnamese salamanders

The amphibian chytrid fungi, Batrachochytrium dendrobatidis (Bd) and B. salamandrivorans (Bsal), pose a major threat to amphibian biodiversity. Recent evidence suggests Southeast Asia as a potential cradle for both fungi, which likely resulted in widespread host-pathogen co-existence. We sampled 583 salamanders from 8 species across Vietnam in 55 locations for Bsal and Bd, determined scaled mass index as a proxy for fitness and collected environmental data. Bsal was found within 14 of the 55 habitats (2 of which it was detected in 2013), in 5 salamandrid species, with a prevalence of 2.92%. The globalized pandemic lineage of Bd was found within one pond on one species with a prevalence of 0.69%. Combined with a complete lack of correlation between infection and individual body condition and absence of indication of associated disease, this suggests low level pathogen endemism and Bsal and Bd co-existence with Vietnamese salamandrid populations. Bsal was more widespread than Bd, and occurs at temperatures higher than tolerated by the type strain, suggesting a wider thermal niche than currently known. Therefore, this study provides support for the hypothesis that these chytrid fungi may be endemic to Asia and that species within this region may act as a disease reservoir

The influence of income tax rate, tunneling incentives, and return on equity on transfer pricing behavior of foreign direct investment enterprises in Vietnam

The utilization of competitive advantages in international trading has fortuitously put transnational manufacturing enterprises in the position of distorting transfer pricing techniques to maximize profits. The paper aims to explore the influence of the determinants on the transfer pricing behavior of foreign direct investment enterprises in Vietnam. The paper collects primary data from the financial statements of 96 foreign direct investment enterprises in Vietnam over six years from 2016 to 2021. The paper gets a final panel data of 576 observations to be processed by the fixed effects model estimation method using EViews 12. Supporting agency theory and positive accounting theory, the results show that the income tax rate negatively influences transfer pricing behavior, while tunneling incentives and return on equity positively affect transfer pricing behavior. The paper highlights that government agencies should reperform and implement fiscal policies synchronously to be able to monitor transfer pricing behaviors of foreign direct investment enterprises in Vietnam

LAND USE CHANGE AND RELATED PROBLEMS UNDER URBANIZATION IN SUBURBAN AREA OF HANOI CITY (A CASE STUDY OF HOANG LIET COMMUNE, THANH TRI DISTRICT)

Joint Research on Environmental Science and Technology for the Eart