An appropriate optimal number of market segments(ONS)estimation is essential for an enterprise to achieve successful market segmentation,but at present,there is a serious lack of attention to this issue in market segm...An appropriate optimal number of market segments(ONS)estimation is essential for an enterprise to achieve successful market segmentation,but at present,there is a serious lack of attention to this issue in market segmentation.In our study,an independent adaptive ONS estimation method BWCON-NSDK-means++is proposed by integrating a newinternal validity index(IVI)Between-Within-Connectivity(BWCON)and a newstable clustering algorithmNatural-SDK-means++(NSDK-means++)in a novel way.First,to complete the evaluation dimensions of the existing IVIs,we designed a connectivity formula based on the neighbor relationship and proposed the BWCON by integrating the connectivity with other two commonly considered measures of compactness and separation.Then,considering the stability,number of parameters and clustering performance,we proposed the NSDK-means++to participate in the integrationwhere the natural neighbor was used to optimize the initial cluster centers(ICCs)determination strategy in the SDK-means++.At last,to ensure the objectivity of the estimatedONS,we designed a BWCON-based ONS estimation framework that does not require the user to set any parameters in advance and integrated the NSDK-means++into this framework forming a practical ONS estimation tool BWCON-NSDK-means++.The final experimental results showthat the proposed BWCONand NSDK-means++are significantlymore suitable than their respective existing models to participate in the integration for determining theONS,and the proposed BWCON-NSDK-means++is demonstrably superior to the BWCON-KMA,BWCONMBK,BWCON-KM++,BWCON-RKM++,BWCON-SDKM++,BWCON-Single linkage,BWCON-Complete linkage,BWCON-Average linkage and BWCON-Ward linkage in terms of the ONS estimation.Moreover,as an independentmarket segmentation tool,the BWCON-NSDK-means++also outperforms the existing models with respect to the inter-market differentiation and sub-market size.展开更多
Here we report a generalizable strategy for the synthesis of rare-earth metal–organic frameworks(RE-MOFs)with 12-connected RE_(9)clusters and shp topology.A total of 26 isostructural RE-MOFs(JNU-205-RE and JNU-206-RE...Here we report a generalizable strategy for the synthesis of rare-earth metal–organic frameworks(RE-MOFs)with 12-connected RE_(9)clusters and shp topology.A total of 26 isostructural RE-MOFs(JNU-205-RE and JNU-206-RE)were obtained from two X-shaped tetracarboxylate linkers,4,4′,4′′,4′′′-benzene-2,3,5,6-tetrayl-tetrabenzoate(BTEB)and 4,4′,4′′,4′′′-pyrazine-2,3,5,6-tetrayl-tetrabenzoate(BTTB).展开更多
基金supported by the earmarked fund for CARS-29 and the open funds of the Key Laboratory of Viticulture and Enology,Ministry of Agriculture,China.
文摘An appropriate optimal number of market segments(ONS)estimation is essential for an enterprise to achieve successful market segmentation,but at present,there is a serious lack of attention to this issue in market segmentation.In our study,an independent adaptive ONS estimation method BWCON-NSDK-means++is proposed by integrating a newinternal validity index(IVI)Between-Within-Connectivity(BWCON)and a newstable clustering algorithmNatural-SDK-means++(NSDK-means++)in a novel way.First,to complete the evaluation dimensions of the existing IVIs,we designed a connectivity formula based on the neighbor relationship and proposed the BWCON by integrating the connectivity with other two commonly considered measures of compactness and separation.Then,considering the stability,number of parameters and clustering performance,we proposed the NSDK-means++to participate in the integrationwhere the natural neighbor was used to optimize the initial cluster centers(ICCs)determination strategy in the SDK-means++.At last,to ensure the objectivity of the estimatedONS,we designed a BWCON-based ONS estimation framework that does not require the user to set any parameters in advance and integrated the NSDK-means++into this framework forming a practical ONS estimation tool BWCON-NSDK-means++.The final experimental results showthat the proposed BWCONand NSDK-means++are significantlymore suitable than their respective existing models to participate in the integration for determining theONS,and the proposed BWCON-NSDK-means++is demonstrably superior to the BWCON-KMA,BWCONMBK,BWCON-KM++,BWCON-RKM++,BWCON-SDKM++,BWCON-Single linkage,BWCON-Complete linkage,BWCON-Average linkage and BWCON-Ward linkage in terms of the ONS estimation.Moreover,as an independentmarket segmentation tool,the BWCON-NSDK-means++also outperforms the existing models with respect to the inter-market differentiation and sub-market size.
基金financially supported by the National Natural Science Foundation of China(nos 21731002,21975104,22101099 and 22150004)the Major Program of Guangdong Basic and Applied Research(2019B030302009)+1 种基金the Guangdong Basic and Applied Basic Research Foundation(no.2020A1515011005)the Special Fund Project for Science and Technology of Guangdong(STKJ2021172).We thank the high performance public computing service platform of Jinan University for providing computing resources.
文摘Here we report a generalizable strategy for the synthesis of rare-earth metal–organic frameworks(RE-MOFs)with 12-connected RE_(9)clusters and shp topology.A total of 26 isostructural RE-MOFs(JNU-205-RE and JNU-206-RE)were obtained from two X-shaped tetracarboxylate linkers,4,4′,4′′,4′′′-benzene-2,3,5,6-tetrayl-tetrabenzoate(BTEB)and 4,4′,4′′,4′′′-pyrazine-2,3,5,6-tetrayl-tetrabenzoate(BTTB).
