Mathematical Model of Forest Fire Soil-thrower Movement

The design of a forest fire soil-thrower made to prevent and eliminate ground forest fires is presented. A mathematical model of machine movement has been developed, which enables to study the laws of the interaction process of the design with the soil. It is accepted that the machine has two degrees of freedom. The mathematical model has been obtained using the Lagrange equations of the second kind. The design and technological parameters of the forest fire soil-throwing machine, affecting the efficiency of its work, including mass and width of the grip of the ripper casing, mass, radius and frequency of rotation of the milling tool, the number and geometric parameters of the blades are taken into account. Mathematical model enables to determine the effect of these parameters on the characteristics of the movement of ripper casing and milling working body. A mathematical model is needed to synchronize the translational motion of the unit and the rotational motion of the rotor. Formulas have been obtained for the steady motion of the forest fire soil-thrower, that determine the hauling power of tractor and torque that ensures the operation of milling tools

Генерация ключевых слов для русскоязычных научных текстов с помощью модели mT5

In this work, we applied the multilingual text-to-text transformer (mT5) to the task of keyphrase generation for Russian scientific texts using the Keyphrases CS&Math Russian corpus. The automatic selection of keyphrases is a relevant task of natural language processing since keyphrases help readers find the article easily and facilitate the systematization of scientific texts. In this paper, the task of keyphrase selection is considered as a text summarization task. The mT5 model was fine-tuned on the texts of abstracts of Russian research papers. We used abstracts as an input of the model and lists of keyphrases separated with commas as an output. The results of mT5 were compared with several baselines, including TopicRank, YAKE!, RuTermExtract, and KeyBERT. The results are reported in terms of the full-match F1-score, ROUGE-1, and BERTScore. The best results on the test set were obtained by mT5 and RuTermExtract. The highest F1-score is demonstrated by mT5 (11,24 %), exceeding RuTermExtract by 0,22 %. RuTermextract shows the highest score for ROUGE-1 (15,12 %). According to BERTScore, the best results were also obtained using these methods: mT5 — 76,89 % (BERTScore using mBERT), RuTermExtract — 75,8 % (BERTScore using ruSciBERT). Moreover, we evaluated the capability of mT5 for predicting the keyphrases that are absent in the source text. The important limitations of the proposed approach are the necessity of having a training sample for fine-tuning and probably limited suitability of the fine-tuned model in cross-domain settings. The advantages of keyphrase generation using pre-trained mT5 are the absence of the need for defining the number and length of keyphrases and normalizing produced keyphrases, which is important for flective languages, and the ability to generate keyphrases that are not presented in the text explicitly.Авторами предлагается подход к генерации ключевых слов для русскоязычных научных текстов с помощью модели mT5 (multilingual text-to-text transformer), дообученнной на материале текстового корпуса Keyphrases CS&Math Russian. Автоматический подбор ключевых слов является актуальной задачей обработки естественного языка, поскольку ключевые слова помогают читателям осуществлять поиск статей и облегчают систематизацию научных текстов. В данной работе задача подбора ключевых слов рассматривается как задача автоматического реферирования текстов. Дообучение mT5 осуществлялась на текстах аннотаций русскоязычных научных статей. В качестве входных и выходных данных выступали тексты аннотаций и списки ключевых слов, разделенных запятыми, соответственно. Результаты, полученные с помощью mT5, были сравнены с результатами нескольких базовых методов: TopicRank, YAKE!, RuTermExtract, и KeyBERT. Для представления результатов использовались следующие метрики: F-мера, ROUGE-1, BERTScore. Лучшие результаты на тестовой выборке были получены с помощью mT5 и RuTermExtract. Наиболее высокое значение F-меры продемонстрировала модель mT5 (11.24 %), превзойдя RuTermExtract на 0.22 %. RuTermExtract показал лучший результат по метрике ROUGE-1 (15.12 %). Лучшие результаты по BERTScore также были достигнуты этими двумя методами: mT5 — 76.89 % (BERTScore, использующая модель mBERT), RuTermExtract — 75.8 % (BERTScore на основе ruSciBERT). Также авторами была оценена возможность mT5 генерировать ключевые слова, отсутствующие в исходном тексте. К ограничениям предложенного подхода относятся необходимость формирования обучающей выборки для дообучения модели и, вероятно, ограниченная применимость дообученной модели для текстов других предметных областей. Преимущества генерации ключевых слов с помощью mT5 — отсутствие необходимости задавать фиксированные значения длины и количества ключевых слов, необходимости проводить нормализацию, что особенно важно для флективных языков, и возможность генерировать ключевые слова, в явном виде отсутствующие в тексте

Keyphrase generation for the Russian-language scientific texts using mT5

In this work, we applied the multilingual text-to-text transformer (mT5) to the task of keyphrase generation for Russian scientific texts using the Keyphrases CS&Math Russian corpus. The automatic selection of keyphrases is a relevant task of natural language processing since keyphrases help readers find the article easily and facilitate the systematization of scientific texts. In this paper, the task of keyphrase selection is considered as a text summarization task. The mT5 model was fine-tuned on the texts of abstracts of Russian research papers. We used abstracts as an input of the model and lists of keyphrases separated with commas as an output. The results of mT5 were compared with several baselines, including TopicRank, YAKE!, RuTermExtract, and KeyBERT. The results are reported in terms of the full-match F1-score, ROUGE-1, and BERTScore. The best results on the test set were obtained by mT5 and RuTermExtract. The highest F1-score is demonstrated by mT5 (11,24 %), exceeding RuTermExtract by 0,22 %. RuTermextract shows the highest score for ROUGE-1 (15,12 %). According to BERTScore, the best results were also obtained using these methods: mT5 — 76,89 % (BERTScore using mBERT), RuTermExtract — 75,8 % (BERTScore using ruSciBERT). Moreover, we evaluated the capability of mT5 for predicting the keyphrases that are absent in the source text. The important limitations of the proposed approach are the necessity of having a training sample for fine-tuning and probably limited suitability of the fine-tuned model in cross-domain settings. The advantages of keyphrase generation using pre-trained mT5 are the absence of the need for defining the number and length of keyphrases and normalizing produced keyphrases, which is important for flective languages, and the ability to generate keyphrases that are not presented in the text explicitly

Mathematical Model of Forest Fire Soil-thrower Movement

The design of a forest fire soil-thrower made to prevent and eliminate ground forest fires is presented. A mathematical model of machine movement has been developed, which enables to study the laws of the interaction process of the design with the soil. It is accepted that the machine has two degrees of freedom. The mathematical model has been obtained using the Lagrange equations of the second kind. The design and technological parameters of the forest fire soil-throwing machine, affecting the efficiency of its work, including mass and width of the grip of the ripper casing, mass, radius and frequency of rotation of the milling tool, the number and geometric parameters of the blades are taken into account. Mathematical model enables to determine the effect of these parameters on the characteristics of the movement of ripper casing and milling working body. A mathematical model is needed to synchronize the translational motion of the unit and the rotational motion of the rotor. Formulas have been obtained for the steady motion of the forest fire soil-thrower, that determine the hauling power of tractor and torque that ensures the operation of milling tools.</jats:p