In the context of the continuous deepening of the“Double Reduction”policy and the growing demand for quality education,leveled mathematics readers,as an emerging form of publishing that integrates subject education ...In the context of the continuous deepening of the“Double Reduction”policy and the growing demand for quality education,leveled mathematics readers,as an emerging form of publishing that integrates subject education and reading experience,face challenges such as unclear leveling logic,insufficient functional support,and weak user engagement.This paper introduces the 4V marketing theory and constructs an analytical framework from four dimensions:differentiation,functionality,added value,and resonance.Two representative products,“Climbing Mathematics”and“Spark Mathematics,”are selected for a typical case comparison to identify their strengths and weaknesses in content design,service systems,and brand operation,and to extract transferable strategic elements.The study finds that the user-value-oriented strategy based on the 4V model can effectively address the core issues in the market promotion and user relationship building of leveled mathematics readers,providing practical paths and theoretical support for educational publishing institutions to achieve product innovation and brand upgrading in this niche field.展开更多
文摘In the context of the continuous deepening of the“Double Reduction”policy and the growing demand for quality education,leveled mathematics readers,as an emerging form of publishing that integrates subject education and reading experience,face challenges such as unclear leveling logic,insufficient functional support,and weak user engagement.This paper introduces the 4V marketing theory and constructs an analytical framework from four dimensions:differentiation,functionality,added value,and resonance.Two representative products,“Climbing Mathematics”and“Spark Mathematics,”are selected for a typical case comparison to identify their strengths and weaknesses in content design,service systems,and brand operation,and to extract transferable strategic elements.The study finds that the user-value-oriented strategy based on the 4V model can effectively address the core issues in the market promotion and user relationship building of leveled mathematics readers,providing practical paths and theoretical support for educational publishing institutions to achieve product innovation and brand upgrading in this niche field.
文摘目的:探讨实时剪切波弹性成像(shear wave elastography,SWE)在不同大小甲状腺TI-RADS 3~4类结节鉴别诊断中的应用。方法:常规超声观察164例患者(共197个结节)甲状腺结节的边界、内部回声、是否合并钙化、纵横比、内部及周边血流情况等,依据甲状腺TI-RADS分类方法对相应的甲状腺状腺结节进行分类,同时进行剪切波弹性成像,记录结节杨氏模量最大值(Emax),绘制ROC曲线,获得鉴别诊断甲状腺良恶性结节的Emax最佳界值。其中TI-RADS 3~4类结节186个,分直径≤10 mm组(Ⅰ组)和直径>10 mm组(Ⅱ组)。以病理结果为金标准,分别绘制ROC曲线,评价Emax值在Ⅰ、Ⅱ组病变中的应用价值。结果:杨氏模量Emax界值为52.5 k Pa。Ⅰ组和Ⅱ组的敏感性、准确性及特异性分别为57.4%、66.2%及90.0%和87.5%、79.5%及68.8%,ROC曲线下面积(area under the curve,AUC)分别为0.810和0.842。结论:SWE界值鉴别诊断甲状腺良恶性结节差异有统计学意义;SWE对>10 mm甲状腺结节良恶性鉴别诊断更有应用价值;SWE对≤10 mm甲状腺结节应用价值有限。
