Reconstruction of time series with missing value using 2D representation-based denoising autoencoder

Time series analysis is a key technology for medical diagnosis,weather forecasting and financial prediction systems.However,missing data frequently occur during data recording,posing a great challenge to data mining tasks.In this study,we propose a novel time series data representation-based denoising autoencoder(DAE)for the reconstruction of missing values.Two data representation methods,namely,recurrence plot(RP)and Gramian angular field(GAF),are used to transform the raw time series to a 2D matrix for establishing the temporal correlations between different time intervals and extracting the structural patterns from the time series.Then an improved DAE is proposed to reconstruct the missing values from the 2D representation of time series.A comprehensive comparison is conducted amongst the different representations on standard datasets.Results show that the 2D representations have a lower reconstruction error than the raw time series,and the RP representation provides the best outcome.This work provides useful insights into the better reconstruction of missing values in time series analysis to considerably improve the reliability of timevarying system.

Some Hybrid Mean Values of a New Number Theoretic Function

Let p and q be two distinct primes, epq（n） denotes the largest exponent of power pq which divides n. In this paper, we study the mean value properties of function epq（n）, and give some hybrid mean value formulas for epq（n） and Dirichlet divisor function d（n）. Key words： largest exponent; asymptotic formula; hybrid mean value; Dirichlet divisor function d（n）

Implications of vitamin D for flesh quality of grass carp(Ctenopharyngodon idella):antioxidant ability,nutritional value,sensory quality,and myofiber characteristics

Background Muscle represents a unique and complex system with many components and comprises the major edible part of animals.Vitamin D is a critical nutrient for animals and is known to enhance calcium absorption and immune response.In recent years,dietary vitamin D supplementation in livestock has received increased attention due to biological responses including improving shear force in mammalian meat.However,the vitamin D acquisition and myofiber development processes in fish differ from those in mammals,and the effect of vitamin D on fish flesh quality is poorly understood.Here,the influence of dietary vitamin D on fillet quality,antioxidant ability,and myofiber development was examined in grass carp(Ctenopharyngodon idella).Methods A total of 540 healthy grass carp,with an initial average body weight of 257.24±0.63 g,were allotted in 6 experimental groups with 3 replicates each,and respectively fed corresponding diets with 15.2,364.3,782.5,1,167.9,1,573.8,and 1,980.1 IU/kg vitamin D for 70 d.Results Supplementation with 1,167.9 IU/kg vitamin D significantly improved nutritional value and sensory quality of fillets,enhancing crude protein,free amino acid,lipid,and collagen contents;maintaining an ideal pH;and reduc-ing lactate content,shear force,and cooking loss relative to respective values in the control(15.2 IU/kg)group.Average myofiber diameter and the frequency of myofibers>50μm in diameter increased under supplementation with 782.5–1,167.9 IU/kg vitamin D.Levels of oxidative damage biomarkers decreased,and the expression of antioxi-dant enzymes and nuclear factor erythroid 2-related factor 2 signaling molecules was upregulated in the 1,167.9 IU/kg vitamin D treatment compared to respective values in the control group.Furthermore,vitamin D supplementation activated cell differentiation by enhancing the expression of myogenic regulatory factors and myocyte enhancer factors compared to that in the control group.In addition,supplementation with 1,167.9 IU/kg vitamin D improved protein deposition associated with protein synthesis molecule(target of rapamycin)signaling and vitamin D receptor paralogs,along with inhibition of protein degradation(forkhead box protein 1)signaling.Conclusions Overall,the results demonstrated that vitamin D strengthened antioxidant ability and myofiber devel-opment,thereby enhancing nutritional value and sensory quality of fish flesh.These findings suggest that dietary vitamin D supplementation is conducive to the production of nutrient-rich,high quality aquaculture products.

Analysis of Network Traffic with Extreme Value Theory

It is very im portant to analyze network traffic in the network control and management. In thi s paper, extreme value theory is first introduced and a model with threshold met hods is proposed to analyze the characteristics of network traffic. In this mode l, only some traffic data that is greater than threshold value is considered. Th en the proposed model with the trace is simulated by using S Plus software. The modeling results show the network traffic model constructed from the extreme va lue theory fits well with that of empirical distribution. Finally, the extreme v alue model with the FARIMA(p,d,q) modeling is compared. The anal ytical results illustrate that extreme value theory has a good application foreg round in the statistic analysis of network traffic. In addition, since only some traffic data which is greater than the threshold is processed, the computation overhead is reduced greatly.

ON MULTIPLE WIENER INTEGRAL EXPANSIONS FOR D'-VALUED NONLINEAR RANDOM FUNCTIONALS

In this paper, the multiple stochastic integral with respect to a Wiener D'-process is defined. And also it is shown that for a D'-valued nonlinear random functional there exists a sequence of multiple integral kernels such that the nonlinear functional can be expanded by series of multiple Wiener integrals of the integral kernels with respect to the Wiener D'-process.

Application value of 3D printing assisted pedicle screw placement in the treatment of thoracolumbar spinal fractures

Objective:To evaluate the value of 3D printing assisted pedicle screw placement in the treatment of thoracolumbar spinal fractures.Methods: 56 cases of thoracolumbar spinal fractures patients underwent 3D printing assisted pedicle screw placement (study group) and another 56 cases of thoracolumbar spinal fractures patients underwent conventional screw placement (control group) in our department from February 2016 to September 2017 were selected. Then the surgical related indicators, JOA score, the reduction of injured vertebrae and complications were recorded and compared between groups at different time points, including, before operation (T0), postoperative 1mon (T1), postoperative 6mon (T2) and postoperative 12mon (T3).Results: The operation time, intraoperative X-ray fluoroscopy frequency and intraoperative blood loss in the study group were significantly lower than those in the control group (P<0.05), meanwhile the accuracy rate of screw placement was significantly higher than that of the control group (P<0.05). JOA scores at T1, T2 and T3 in both groups were significantly higher than those at T0 (P<0.05), and JOA scores at all postoperative time points in the study group were significantly higher than those in the control group (P<0.05). Compared with T0, the ratio of the anterior and posterior border height of injured vertebrae in the two groups at T2 was significantly increased (P<0.05), while the Cobb Angle of sagittal kyphoid significantly was decreased (P<0.05). Meanwhile, the reduction of injured vertebrae in the study group was significantly better than that the control group at T2 (P<0.05). The incidence of complications in the study group was significantly lower than that in the control group (P<0.05).Conclusion: The application of 3D printing assisted pedicle screw placement in the treatment has the advantages of less injury to patients, good prognosis and high safety, which is worthy of clinical application.

The Effects of Heat Shock on the D-Values of <i>Listeria monocytogenes</i>on Selected Seafood Matrices

With more ready-to-eat foods and increased shelf-lives, prevention of Listeria monocytogenes contamination has become a necessity for the food industry. This study examined the effects of sublethal heat treatment on the decimal reduction time (D-values) of three L. monocytogenes serotypes (1/2a, 1/2b, 4c), and non-pathogenic L. innocua. The D70 (D-value at 70℃) values of heat-shocked (HS) and non-heat-shocked (NHS) Listeria grown in tryptic soy broth (TSB) were determined. The D70 values of HS L. monocytogenes serotype 1/2a and L. innocua were significantly higher compared to NHS cultures, although by 48 h, the values returned to NHS levels. When HS and NHS 1/2a and 1/2b were inoculated on crab meat and cooked shrimp, the D70 values of HS cultures were at least 2-fold higher, compared to when they were grown in TSB. This increase in heat resistance for the HS cultures may be attributed to the protective effect of the seafood matrix itself.

Seismicity Factor A-Value and Its Application to Mid-Term Earthquake Prediction in North China

The seismicity factor A-value is defined by synthesizing the seismicity precursors in time, space and magnitude in this paper. The seismicity data of moderate or small earthquakes during 1972 ~ 1996 in North China are used to perform spacial scanning of seismicity factor A-value. The result shows that there are obviously anomaly zones of A-value with better prediction effect in the mid-term of 2~3 years before most moderately strong earthquakes. Some problems regarding the mid-term prediction using A-value have been discussed.

D-二聚体与C反应蛋白对Stanford A型主动脉夹层动脉瘤患者术后远期预后的预测价值

目的分析D-二聚体(D-D)与C反应蛋白(CRP)在Stanford A型主动脉夹层动脉瘤(ADA)患者术后远期预后中的预测价值。方法选取76例胸痛患者为研究对象,所有患者均行心脏超声或主动脉CT血管成像检查,将45例Stanford A型ADA患者纳入观察组,均行手术治疗;非Stanford A型ADA的31例患者纳入对照组。对比2组发生胸痛72 h内的D-D与CRP水平。术后对观察组随访3年,按临床结局分成死亡组(n=10)与存活组(n=35),对比2组D-D与CRP水平;另绘制受试者工作曲线(ROC),分析D-D、CRP单独与联合预测Stanford A型ADA患者的远期预后临床价值。结果观察组的D-D[(1.31±0.35)mg/L]与CRP[(16.59±2.34)mg/L]水平高于对照组[(0.68±0.13)mg/L、(7.53±1.26)mg/L],差异有统计学意义(P<0.05);ADA患者中死亡组的D-D[(1.78±0.49)mg/L]与CRP[(30.46±4.77)mg/L]水平高于存活组[(1.03±0.26)mg/L、(13.59±2.36)mg/L],差异有统计学意义(P<0.05)。ROC结果显示,D-D与CRP联合检测预测Stanford A型ADA患者远期预后的曲线下面积(AUC)[0.909(95%CI:0.823~0.994)]高于D-D与CRP单独预测[0.806(95%CI:0.680~0.931)、0.840(95%CI:0.727~0.953)]。结论Stanford A型ADA患者血清内的D-D与CRP水平呈高表达,且表达水平越高,患者预后越差,两项指标联合可有效预测患者的远期预后,临床应用价值较高。

数字贸易对制造业全球价值链地位的影响研究——基于跨国面板数据的经验证据

基于2007-2020年54个国家的跨国面板数据,采用固定效应模型和面板门槛模型,实证检验了数字贸易发展对一国制造业全球价值链地位的影响。研究发现,数字贸易与制造业全球价值链地位之间存在“先负后正”的U型关系,即在数字贸易发展初期,其对制造业全球价值链地位会产生一定的抑制作用;超过一定门槛值后,这种抑制作用会慢慢演变成促进作用。研发强度和贸易开放度对数字贸易提升国家制造业全球价值链地位起到正向调节作用;进一步的异质性检验发现,数字贸易对发达国家制造业全球价值链地位具有更大的提升作用。据此,文章提出应加大数字贸易发展、重视研发投入力度、推进高水平贸易开放等对策建议。

骨质疏松患者EQ⁃5 D⁃5L量表健康相关影响因素分析

目的探讨住院骨质疏松症患者的健康相关生命质量状况及健康效用值,并分析其影响因素。方法以甘肃省人民医院住院骨质疏松症患者为调查对象,收集患者一般资料、检测骨代谢标志物,测量腰椎和髋部骨密度,评估患者跌倒风险、预测骨折、评估生命质量并计算健康效用值。采用Mann⁃Whitney检验及Kruskal⁃Wallis检验进行单因素分析,并用Tobit回归模型分析研究对象生命质量的影响因素。结果最终纳入241名住院骨质疏松症患者为研究对象,健康效用值为0.876(0.728~0.942)。单因素分析显示,年龄、文化程度、跌倒风险、居住地、吸烟、既往用抗骨松药物、低创骨折史、FRAX评分、左髋部T值、钙与骨质疏松患者健康效用值相关(P<0.05);Tobit回归模型结果显示,文化程度高(小学:β=0.119,P=0.043;初中:β=0.113,P=0.044;高中或中专或技校β=0.171,P=0.002)是生命质量的保护因素,跌倒风险高(中风险β=-0.138,P<0.001;高风险β=-0.316,P<0.001)、低创骨折史(β=-0.190,P<0.001)、FRAX评分为高危(β=-0.088,P=0.027)是生命质量的危险因素。结论与普通人群相比,住院骨质疏松症患者健康效用值下降,表明健康相关生命质量差。文化程度低、跌倒风险高、骨折以及FRAX评分高危的患者生命质量较差。为提高患者生命质量,应该加强对该类患者的健康宣教,预防跌倒并积极主动的进行干预,防止骨折及再骨折的发生。

首次复治菌阳肺结核合并糖尿病患者血清IAP、25(OH)D水平及对疗效的预测价值

目的探讨首次复治菌阳肺结核(TB)合并糖尿病(DM)患者血清免疫抑制酸性蛋白(IAP)、25-羟基维生素D[25(OH)D]表达变化及2者对治疗疗效的预测价值。方法选取本院2019年1月至2022年4月首次复治菌阳TB合并DM患者48例为实验组,另选同期单纯TB患者48例为对照组。测定并比较两组患者治疗前后血清IAP、25(OH)D水平;多因素Logistic回归分析影响菌阳TB合并DM患者痰菌阴转的可能因素;受试者工作特征(ROC)曲线评估IAP、25(OH)D对患者痰菌未转阴的预测价值。结果实验组痰菌阴转患者31例(64.58%)显著低于对照组痰菌阴转患者40例(83.33%)。治疗2个月后,实验组、对照组血清IAP均显著降低,25(OH)D水平均显著升高(P<0.05);且治疗2个月后实验组血清IAP水平显著低于对照组,25(OH)D水平显著高于对照组(P<0.05)。多因素Logistic回归分析显示,IAP高水平是首次复治菌阳TB合并DM患者痰菌未阴转的危险因素(P<0.05),25(OH)D高水平是首次复治菌阳TB合并DM患者痰菌未阴转的保护因素(P<0.05)。ROC曲线显示,IAP预测痰菌未阴转的AUC为0.719,25(OH)D预测痰菌未阴转的AUC为0.791,2者联合预测痰菌未阴转的AUC为0.871,明显高于2者单独诊断(Z_(联合vs IAP)=2.605、P=0.009;Z_(联合vs 25(OH)D)=2.408、P=0.016),且灵敏度、特异性分别为78.46%、82.86%。结论首次复治菌阳TB合并DM患者经治疗后血清IAP水平降低、25(OH)D水平升高,2者联合对菌阳TB合并DM患者痰菌未阴转具有一定预测价值。

NT-proBNP、D-D、CRP检测在中老年急性脑梗死患者中的临床诊断价值分析

目的 分析氨基末端脑钠肽前体(NT-proBNP)、D-二聚体(D-D)、C反应蛋白(CRP)检测对中老年急性脑梗死(ACI)患者的诊断价值。方法 选取中老年急性脑梗死患者52例为观察组[根据病灶直径不同分为大面积梗死组(>5 cm)10例、中面积梗死组(≤5 cm,>3 cm)16例、小面积梗死组(≤3 cm,>1.5 cm)26例],另选取健康体检者50例为对照组。观察组及对照组均进行D-D、CRP、NT-proBNP水平检测。比较观察组及对照组的CRP、D-D、NT-proBNP水平,观察组不同脑梗死面积患者的CRP、D-D、NT-proBNP水平。结果观察组CRP、D-D、NT-proBNP水平均高于对照组,差异具有统计学意义(P<0.05)。观察组中,大面积梗死组的NT-proBNP、D-D、CRP水平分别为(3351.70±940.97)pg/ml、(898.43±323.19)ng/ml、(41.79±11.08)mg/L,中面积梗死组的NT-proBNP、D-D、CRP水平分别为(1338.06±345.23)pg/ml、(573.88±312.67)ng/ml、(32.05±11.77)mg/L,小面积梗死组的NT-proBNP、D-D、CRP水平分别为(447.00±195.72)pg/ml、(334.15±229.81)ng/ml、(18.03±10.14)mg/L。大面积梗死组患者的NT-proBNP、D-D、CRP水平均高于中面积梗死组及小面积梗死组,中面积梗死组患者的NT-proBNP、D-D、CRP水平均高于小面积梗死组,差异具有统计学意义(P<0.05)。结论 D-D、CRP、NT-proBNP在诊断中老年急性脑梗死患者中存在较高的应用价值。

凝血功能联合平均血小板体积与血小板计数比值对脑梗死的诊断价值

目的探讨凝血功能指标联合平均血小板体积与血小板计数比值对急性脑梗死(ACI)的诊断价值。方法95例ACI患者按照疾病严重程度分为轻度39例、中度37例及重度19例,比较不同程度ACI患者入院时的凝血功能指标[凝血酶原时间(PT)、活化部分凝血活酶时间(APTT)、纤维蛋白原(FIB)、凝血酶时间(TT)、D二聚体(D-Dimer)、纤维蛋白溶解产物(FDP)]和平均血小板体积与血小板计数比值;采用ROC曲线下面积(AUC)评估凝血功能指标、平均血小板体积与血小板计数比值单项或联合检测对ACI严重程度的诊断价值;采用Pearson相关系数(r)分析各项检测指标与ACI的相关性。结果轻度组患者PT、APTT及TT长于中度组和重度组,FIB、D-Dimer、FDP及平均血小板体积与血小板计数比值低于中度组和重度组,差异有统计学意义(P<0.05);ROC曲线结果显示,凝血功能指标、平均血小板体积与血小板计数比值联合检测诊断ACI的AUC为0.943,高于其他单项检测的AUC;相关性分析显示,ACI患者PT、APTT、FIB、TT、D-Dimer、FDP及平均血小板体积与血小板计数比值均存在一定的相关性(P<0.05)。结论不同严重程度ACI患者的凝血功能指标及平均血小板体积与血小板计数比值存在明显差异,凝血功能指标及平均血小板体积与血小板计数比值对ACI诊断具有一定价值,联合检测诊断价值更高。

不同TyG水平糖尿病患者血糖波动、维生素D水平、铁代谢失衡特征及其与糖尿病并发症的相关性分析

目的探讨不同甘油三酯血糖(TyG)水平糖尿病患者血糖波动、维生素D水平、铁代谢失衡特征及其与糖尿病并发症的相关性。方法回顾性选择2019年1月至2023年12月来巴彦淖尔市医院诊治的2型糖尿病患者240例,根据TyG四分位水平分为Q1组:6.41≤TyG<8.45(n=58),Q2组:8.45≤TyG<8.80(n=61),Q3组:8.80≤TyG<9.41(n=64),Q4组:9.41≤TyG<10.43(n=57)4组;根据患者是否合并慢性并发症,将患者分为合并组(n=155)与未合并组(n=85)。收集所有患者的基本资料(性别、病程、身高、腰围、体重、臀围、计算体重指数、年龄、静息状态下的舒张压/收缩压、腰臀比),检测实验室指标[空腹血糖、糖化血红蛋白、高密度脂蛋白、总胆固醇、甘油三酯、低密度脂蛋白、丙氨转氨酶(ALT)、天冬氨酸转移酶(AST)、尿酸、肌酐、尿素氮、维生素D、铁蛋白、餐后2 h血糖]。对比不同TyG水平糖尿病患者的基本资料、实验室指标水平,分析TyG与有统计学意义指标的相关性,使用单因素分析糖尿病并发症的影响因素,使用Logistic多因素回归分析糖尿病并发症的影响因素,使用ROC曲线分析TyG、维生素D、铁蛋白及三者联合对糖尿病并发症的预测价值。结果Q1、Q2、Q3、Q4组中的高密度脂蛋白、维生素D水平逐渐降低,而空腹血糖、病程、甘油三酯、餐后2 h血糖、体重指数、低密度脂蛋白、尿酸、腰臀比、糖化血红蛋白、肌酐、总胆固醇、铁蛋白逐渐升高,4组组间比较,差异均有统计学意义(P<0.05)。TyG与病程、体重指数、腰臀比、空腹血糖、餐后2 h血糖、糖化血红蛋白、总胆固醇、甘油三酯、低密度脂蛋白、尿酸、肌酐、铁蛋白均呈正相关(P<0.05),与高密度脂蛋白、维生素D均呈负相关(P<0.05)。单因素分析,合并组的糖化血红蛋白、TyG、低密度脂蛋白、病程、尿酸、体重指数、空腹血糖、肌酐、餐后2 h血糖、总胆固醇、腰臀比、甘油三酯、铁蛋白均明显较未合并组高,高密度脂蛋白、维生素D均明显较未合并组低,差异均有统计学意义(P<0.05)。Logistic多因素回归分析结果表明,病程、体重指数、空腹血糖、甘油三酯、铁蛋白、TyG升高是糖尿病并发症的危险因素(P<0.05),维生素D升高是糖尿病发生并发症的保护因素(P<0.05)。TyG、维生素D、铁蛋白及三者联合对糖尿病并发症的预测价值均良好,AUC均>0.8,P<0.05。结论糖尿病患者的TyG水平与血糖水平、维生素D水平、铁代谢失衡特征、糖尿病并发症显著相关,TyG水平越高,血糖水平越高,维生素D水平越低,铁代谢失衡越严重,TyG、维生素D、铁蛋白及三者联合可被用于糖尿病并发症的预测。

联合检测D-二聚体、IL-6及FIB诊断急性胰腺炎的价值分析

目的分析联合检测D-二聚体、白细胞介素-6(interleukin-6,IL-6)及纤维蛋白原(fibrinogen,FIB)诊断急性胰腺炎的价值。方法回顾性分析2021年1月—2023年9月厦门大学附属中山医院救治的164例急性胰腺炎患者。根据急性胰腺炎病情的严重程度进行分组,即轻症急性胰腺炎组(n=67)、中度重症急性胰腺炎组(n=47)、重症急性胰腺炎组(n=50);同时选择同期200名健康者设为对照组。所有患者均于入院48 h内测定D-二聚体、IL-6、FIB水平,并进行对比;同时阐明D-二聚体、IL-6、FIB单一检测及联合检测对诊断急性胰腺炎的临床意义与价值。结果4组D-二聚体、IL-6、FIB水平比较,差异有统计学意义(P<0.05)。D-二聚体、IL-6、FIB水平均与急性胰腺炎病情严重程度呈正相关(P<0.05)。D-二聚体的曲线下面积(area under curve,AUC)、敏感度、特异度分别为0.941、86.57%、99.00%;IL-6的AUC、敏感度、特异度分别为0.844、79.10%、98.50%;FIB的AUC、敏感度、特异度分别为0.789、68.66%、81.00%;联合检测的AUC、敏感度、特异度分别为0.974、92.54%、93.00%。结论D-二聚体、IL-6、FIB均可用于急性胰腺炎的诊断中,且上述指标水平的变化与急性胰腺炎病情具有相关性,同时联合检测更有助于减少漏诊、误诊的发生。

纺织企业国际化程度、研发投入与企业价值——基于门槛回归的经验证据

本研究以2018—2022年纺织类上市企业的面板数据为基础,采用非线性视角与资源有限性理论,运用门槛模型探讨了在不同国际化程度下,研发投入与企业价值之间的关系。研究结果显示:(1)当国际化程度作为门槛变量时,研发投入与企业价值之间呈现出倒U型关系,存在两个门槛值,最优区间为DI≤0.389;(2)研发投入滞后一期和滞后二期与企业价值的关系同样呈现倒U型,最优区间为DI≤0.383;(3)在135个样本企业中,有29.63%的企业国际化程度高于第一门槛值0.389,但未处于最优区间;(4)企业成长性和人力投入回报率与企业价值呈显著正相关,资产负债率与企业价值呈显著负相关。研究结果表明,我国纺织类企业的研发投入整体偏低,引导纺织企业加大研发投入仍是提升企业价值的重要路径。本文对我国纺织企业有效参与国际市场竞争、实现可持续发展具有重要的参考意义。

基于降维机理模型的储能电池安全充电在线控制技术

大倍率充电会引起储能电池负极析锂,进一步可能会诱发电池热失控并导致安全事故。而析锂副反应与电池负极电位直接相关,通过模型精确预测负极电位,传输至储能电池管理系统调整充电工况,可以有效抑制负极析锂。因此,文中提出一种基于降维机理简化伪二维(simplified pseudo two-dimensional,SP2D)模型的储能电池安全充电在线控制技术。首先,对伪二维(pseudo two-dimensional,P2D)模型中部分偏微分方程进行降维简化,建立SP2D模型,同时采用不同的方法获取相应的模型参数。其次,使用实验数据的端电压和负极电位对模型进行验证,结果表明模型在不同倍率恒流工况下精度较高。再次,基于SP2D模型结合比例控制器开展电池无析锂安全充电的仿真工作,结果表明,电池经过1895 s充电即达到截止电压4.3 V,且充电过程中负极电位均处于无析锂安全电位区间。最后,对仿真得到的充电策略进行循环和拆解验证,结果表明提出的充电方法能够实现电池无析锂安全充电。

战略差异度对企业市场价值的影响

以2011—2020年沪深两市A股上市公司为研究样本,实证检验战略差异度作用于企业市场价值的传导路径。研究发现,战略差异度对企业市场价值具有显著的正向影响,战略差异度越大的企业其市场价值越高;对内在机制的研究表明,战略差异度可以通过研发投入和产品竞争优势两个独立中介路径以及“促进研发投入→增强产品竞争优势”的链式中介路径提高企业市场价值;此外,基于战略定位的分样本检验显示,战略差异度与企业市场价值的正向链式中介关系只有在实施较高差异化战略的企业中才显著成立。

供应链绿色技术研发与绿色金融服务协调策略

针对由单个供应商和制造商组成的绿色供应链与银行开展绿色技术研发和绿色金融服务协调问题,分别构建了三方集中决策、供应链集中决策以及三方独立决策模型,分析了绿色技术研发水平、最终产品零售价格、绿色金融服务水平以及市场需求与银行资金利率、贷款利率间的关系,研究了绿色金融服务水平对绿色技术研发水平、零售价格、市场需求以及供应链利润的影响,并对三种模型的最优解进行了比较。最后,利用Shapley值法得到三方集中决策下整体利润的分配方案。