Given two graphs G and H,the Ramsey number R(G,H)is the smallest positive integer N such that every 2-coloring of the edges of K_(N)contains either a red G or a blue H.Let K_(N-1)■K_(1,k)be the graph obtained from K_...Given two graphs G and H,the Ramsey number R(G,H)is the smallest positive integer N such that every 2-coloring of the edges of K_(N)contains either a red G or a blue H.Let K_(N-1)■K_(1,k)be the graph obtained from K_(N-1)by adding anew vertexνconnecting k vertices of K_(N-1).A graph G withχ(G)=k+1 is called edge-critical if G contains an edge e such thatχ(G-e)=k.A considerable amount of research has been conducted by previous scholars on Ramsey numbers ofgraphs.In this study,we show that for an edge-critical graph G with x(G)=k+1,when k≥2,1≥2,and n is sufficiently large,R(G,K_(1)+nK_(t))=knt+1 and r,(G,K_(1)+nK_(t))=(k-1)nt+1.展开更多
In response to issues such as incomplete segmentation and the presence of breakpoints encountered in extracting debris-flow fans using semantic segmentation models,this paper proposes a local feature and spatial atten...In response to issues such as incomplete segmentation and the presence of breakpoints encountered in extracting debris-flow fans using semantic segmentation models,this paper proposes a local feature and spatial attention mechanism to achieve precise segmentation of debris-flow fans.Firstly,leveraging the spatial inhibition mechanism from neuroscience theory as a foundation,an energy function for the local feature and spatial attention mechanism is formulated.Subsequently,by employing optimization theory,a closed-form solution for the energy function is derived,which ensures the lightweight nature of the proposed attention mechanism algorithm.Finally,the performance of this algorithm is compared with other mainstream attention mechanism algorithms embedded in semantic segmentation models through comparative experiments.Experimental results demonstrate that the proposed method outperforms both the original models and mainstream attention mechanisms across various classic models,effectively enhancing the performance of network models in debris-flow fan segmentation tasks.展开更多
Deepwater oil and gas exploration is the key to sustainable breakthroughs in petroleum exploration worldwide.The Central Canyon gas field has confirmed the Lingshui Sag is a hydrocarbon-generating sag,and the deepwate...Deepwater oil and gas exploration is the key to sustainable breakthroughs in petroleum exploration worldwide.The Central Canyon gas field has confirmed the Lingshui Sag is a hydrocarbon-generating sag,and the deepwater reservoirs in the Lingshui Sag still have more fabulous oil and gas exploration potential.Based on drilling data and three-dimensional(3D)seismic data,this paper uses seismic facies analysis,seismic attribute analysis,and coherence slice analysis to identify the types of submarine fans(lobe-shaped and band-shaped submarine fans)that developed in the Lingshui Sag during the Middle Miocene,clarify the source-to-sink system of the submarine fans and discuss the genesis mechanism of the submarine fans.The results show that:(1)the deepwater source-to-sink system of the Lingshui Sag in the Middle Miocene mainly consisted of a“delta(sediment supply)-submarine canyon(sediment transport channel)-submarine fan(deepwater sediment sink)”association;(2)the main factor controlling the formation of the submarine fans developed in the Lingshui Sag was on the relative sea level decline;and(3)the bottom current reworked the lobe-shaped submarine fan that developed in the northern Lingshui Sag and formed the band-shaped submarine fan with a greater sand thickness.This paper aims to provide practical geological knowledge for subsequent petroleum exploration and development in the deepwater area of the Qiongdongnan Basin through a detailed analysis of the Middle Miocene submarine fan sedimentary system developed in the Lingshui Sag.展开更多
The linguistic influence of the Korean Wave （Hallyu, which refers to the Korean pop and drama） on the language of International fans is that of a salient but not linguistically examined phenomenon. This study invest...The linguistic influence of the Korean Wave （Hallyu, which refers to the Korean pop and drama） on the language of International fans is that of a salient but not linguistically examined phenomenon. This study investigates the major aspects of this influence and the linguistic reasons behind its global prevalence. The practical part of this study is conducted on Algerian Hallyu fans from which a sample of 139 participants responded to the questionnaire used as a research instrument for achieving the goal of this study. Findings reveal that Hallyu influence is widely spread in Algeria, where by 98.5% of the participants declared the existence of this influence. This impact on participants＇ language starts from using Korean words in their daily discourse to using English words with an adapted Hallyu meaning and to naming phone contacts with the accurate Korean terms of kinship and endearment. Then, they start using linguistically odd inside jokes taken from Korean idols＇ and K-dramas＇ speech, employing Korean proverbs in their conversations, and gradually adopting a different pronunciation of some English sounds. Moreover, their language stands as a sample of Corpus Planning with two types： Modernization and Graphization. Some words are modernized in order to bridge the gap through Hallyu pals＇ communication with more precise words, while other words are graphitized for the sake of developing new terms or new meanings or to shorten long ones. This thesis contributes to the study of random language, generally, and to Hallyu language, specifically, as an aspect of Conversation Analysis （CA）.展开更多
The League of Legends World Championship finals took place on November 6,a timing welcomed by fans of the game,many of whom work on weekdays.While looking forward to the day,one such fan,Lin Weicang,said the choice of...The League of Legends World Championship finals took place on November 6,a timing welcomed by fans of the game,many of whom work on weekdays.While looking forward to the day,one such fan,Lin Weicang,said the choice of day was considerate,even though Chinese fans would need to stay awake through the night due to the time difference as the game was held in Reykjavik,Iceland.They have another day to relax.展开更多
基金supported by the National Key Research and Development Program of China(2023YFA1010200,2020YFA0713100)the National Natural Science Foundation of China(12071453)the Innovation Program for Quantum Science and Technology(2021ZD0302902).
文摘Given two graphs G and H,the Ramsey number R(G,H)is the smallest positive integer N such that every 2-coloring of the edges of K_(N)contains either a red G or a blue H.Let K_(N-1)■K_(1,k)be the graph obtained from K_(N-1)by adding anew vertexνconnecting k vertices of K_(N-1).A graph G withχ(G)=k+1 is called edge-critical if G contains an edge e such thatχ(G-e)=k.A considerable amount of research has been conducted by previous scholars on Ramsey numbers ofgraphs.In this study,we show that for an edge-critical graph G with x(G)=k+1,when k≥2,1≥2,and n is sufficiently large,R(G,K_(1)+nK_(t))=knt+1 and r,(G,K_(1)+nK_(t))=(k-1)nt+1.
基金National Natural Science Foundation of China,No.61966040.
文摘In response to issues such as incomplete segmentation and the presence of breakpoints encountered in extracting debris-flow fans using semantic segmentation models,this paper proposes a local feature and spatial attention mechanism to achieve precise segmentation of debris-flow fans.Firstly,leveraging the spatial inhibition mechanism from neuroscience theory as a foundation,an energy function for the local feature and spatial attention mechanism is formulated.Subsequently,by employing optimization theory,a closed-form solution for the energy function is derived,which ensures the lightweight nature of the proposed attention mechanism algorithm.Finally,the performance of this algorithm is compared with other mainstream attention mechanism algorithms embedded in semantic segmentation models through comparative experiments.Experimental results demonstrate that the proposed method outperforms both the original models and mainstream attention mechanisms across various classic models,effectively enhancing the performance of network models in debris-flow fan segmentation tasks.
基金The National Natural Science Foundation of China under contract No.42372154。
文摘Deepwater oil and gas exploration is the key to sustainable breakthroughs in petroleum exploration worldwide.The Central Canyon gas field has confirmed the Lingshui Sag is a hydrocarbon-generating sag,and the deepwater reservoirs in the Lingshui Sag still have more fabulous oil and gas exploration potential.Based on drilling data and three-dimensional(3D)seismic data,this paper uses seismic facies analysis,seismic attribute analysis,and coherence slice analysis to identify the types of submarine fans(lobe-shaped and band-shaped submarine fans)that developed in the Lingshui Sag during the Middle Miocene,clarify the source-to-sink system of the submarine fans and discuss the genesis mechanism of the submarine fans.The results show that:(1)the deepwater source-to-sink system of the Lingshui Sag in the Middle Miocene mainly consisted of a“delta(sediment supply)-submarine canyon(sediment transport channel)-submarine fan(deepwater sediment sink)”association;(2)the main factor controlling the formation of the submarine fans developed in the Lingshui Sag was on the relative sea level decline;and(3)the bottom current reworked the lobe-shaped submarine fan that developed in the northern Lingshui Sag and formed the band-shaped submarine fan with a greater sand thickness.This paper aims to provide practical geological knowledge for subsequent petroleum exploration and development in the deepwater area of the Qiongdongnan Basin through a detailed analysis of the Middle Miocene submarine fan sedimentary system developed in the Lingshui Sag.
文摘The linguistic influence of the Korean Wave （Hallyu, which refers to the Korean pop and drama） on the language of International fans is that of a salient but not linguistically examined phenomenon. This study investigates the major aspects of this influence and the linguistic reasons behind its global prevalence. The practical part of this study is conducted on Algerian Hallyu fans from which a sample of 139 participants responded to the questionnaire used as a research instrument for achieving the goal of this study. Findings reveal that Hallyu influence is widely spread in Algeria, where by 98.5% of the participants declared the existence of this influence. This impact on participants＇ language starts from using Korean words in their daily discourse to using English words with an adapted Hallyu meaning and to naming phone contacts with the accurate Korean terms of kinship and endearment. Then, they start using linguistically odd inside jokes taken from Korean idols＇ and K-dramas＇ speech, employing Korean proverbs in their conversations, and gradually adopting a different pronunciation of some English sounds. Moreover, their language stands as a sample of Corpus Planning with two types： Modernization and Graphization. Some words are modernized in order to bridge the gap through Hallyu pals＇ communication with more precise words, while other words are graphitized for the sake of developing new terms or new meanings or to shorten long ones. This thesis contributes to the study of random language, generally, and to Hallyu language, specifically, as an aspect of Conversation Analysis （CA）.
文摘The League of Legends World Championship finals took place on November 6,a timing welcomed by fans of the game,many of whom work on weekdays.While looking forward to the day,one such fan,Lin Weicang,said the choice of day was considerate,even though Chinese fans would need to stay awake through the night due to the time difference as the game was held in Reykjavik,Iceland.They have another day to relax.
