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Transformational leadership style and holistic accountability mechanisms in not-for-profit organisations 非营利组织的变革型领导风格和整体问责机制
IF 1.7 4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-11-30 DOI: 10.1080/00014788.2023.2277919
Graeme Harrison, Jinhua Chen, Lu Jiao
This study examines: (i) the ability of the transformational leadership style of top management to effect holistic accountability in not-for-profit organisations (NFPs) through the use of downward ...
本研究考察:(i)高层管理变革型领导风格在非营利组织(NFPs)中通过使用向下…
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引用次数: 0
Does high-frequency trading cause stock prices to deviate from fundamental values? 高频交易是否会导致股价偏离基本价值?
IF 1.7 4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-11-23 DOI: 10.1080/00014788.2023.2258787
Michael Jung, Kyung Yoon Kwon, Hyungshin Park
We examine whether high-frequency trading (HFT) is associated with greater deviations of stock prices from firms’ fundamental, intrinsic values. Prior studies show that HFT can improve market liqui...
我们研究高频交易(HFT)是否与股票价格偏离公司基本内在价值的较大偏差有关。已有研究表明,高频交易可以提高市场流动性。
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引用次数: 0
The impact of cost stickiness on income smoothing: evidence from employment protection regulations 成本粘性对收入平滑的影响:来自就业保护法规的证据
4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-11-07 DOI: 10.1080/00014788.2023.2266803
Andrei Filip, Junqi Liu, Daphne Lui
AbstractPrior literature suggests that cost stickiness increases the ex-ante volatility and reduces the predictability of earnings. We examine whether managers intentionally undo such consequences by dampening earnings volatility. Exploiting the staggered adoption of wrongful discharge laws as an exogenous instrument for cost stickiness, we document that cost stickiness increases managers’ income-smoothing activities. This response is more pronounced in firms whose earnings are more sensitive to labour costs than their industry peers are and in firms with stronger information-provision incentives. Additional analyses indicate that income smoothing improves sticky-cost firms’ earnings informativeness and that the identified impact of cost stickiness is primarily driven by labour costs. Our results suggest that labour regulations can influence managers’ financial reporting incentives via cost behaviour.Keywords: cost stickinessincome smoothingemployment protectionearnings informativeness AcknowledgmentsWe are heavily indebted to the associated editor Stefano Cascino and two anonymous reviewers for their constructive and thoughtful guidance. We thank Beatriz García-Osma, Thomas Jeanjean, Anne Jeny, Sanjay Kallapur, Itay Kama, Reuven Lehavy, Andreea Moraru-Arfire, Naomi Soderstrom, Samuel Tan (discussant), and workshop participants at ESSEC Business School and the EAA Annual Congress 2019 in Paphos for their helpful comments and suggestions. Junqi Liu also gratefully acknowledges the financial support from the National Natural Science Foundation of China (NSFC), grant number 72202190, from the Social Science Foundation of Fujian Province, grant number FJ2022C034, from the Fundamental Research Funds for the Central Universities, grant number 20720221042, and from the Association Francophone de Comptabilité (AFC). All remaining errors are our own.Disclosure statementNo potential conflict of interest was reported by the author(s).Notes1 Cost stickiness arises primarily from the asymmetry in managers’ real resource commitment. When activity levels increase, managers add resources to meet growing demand; when activity levels fall, they retain some of their underutilized resources, because they perceive the adjustment costs of reducing the resources as higher than the costs of holding them (Anderson et al. Citation2003). In this sense, cost stickiness is distinct from managers’ financial reporting choice.2 In this study, we focus on accrual-based income smoothing, which reflects managerial effort to reduce earnings volatility through accounting methods (in contrast to real activities); see Section 2.2 for more detail. We do not discuss income smoothing through real activities such as discretionary adjustments of R&D or marketing expenditures because such activities are likely detrimental to firm performance in the long run.3 For example, if each employee uses a truck or a software license (i.e. complements to labour), then greater labour cost stickiness wi
摘要已有文献表明,成本粘性增加了事前波动性,降低了收益的可预测性。我们考察了管理者是否有意通过抑制收益波动来消除这种后果。利用错误解雇法的交错采用作为成本粘性的外生工具,我们证明成本粘性增加了管理者的收入平滑活动。这种反应在收入对劳动力成本比同行更敏感的公司和信息提供激励更强的公司中更为明显。进一步的分析表明,收入平滑提高了粘性成本企业的收益信息,成本粘性的确定影响主要由劳动力成本驱动。我们的研究结果表明,劳动法规可以通过成本行为影响管理人员的财务报告激励。关键字:成本粘性收入平滑就业保护收入信息确认我们非常感谢联合编辑Stefano Cascino和两位匿名审稿人的建设性和周到的指导。我们感谢Beatriz García-Osma、Thomas Jeanjean、Anne Jeny、Sanjay Kallapur、Itay Kama、Reuven Lehavy、Andreea Moraru-Arfire、Naomi Soderstrom、Samuel Tan(讨教嘉宾)以及ESSEC商学院和2019年帕福斯EAA年会上的研讨会参与者提供的宝贵意见和建议。刘俊琪也感谢国家自然科学基金(基金号:72202190)、福建省社会科学基金(基金号:FJ2022C034)、中央高校基本科研业务费(基金号:20720221042)和法语国家计算机协会(AFC)的资助。所有剩下的错误都是我们自己的。披露声明作者未报告潜在的利益冲突。注1成本粘性主要源于管理者实际资源承诺的不对称。当活动水平提高时,管理者会增加资源以满足不断增长的需求;当活动水平下降时,他们会保留一些未充分利用的资源,因为他们认为减少资源的调整成本高于持有资源的成本(Anderson等)。Citation2003)。从这个意义上说,成本粘性不同于管理者的财务报告选择在本研究中,我们关注基于权责发生制的收入平滑,这反映了管理层通过会计方法减少盈余波动的努力(与实际活动相反);参见2.2节了解更多细节。我们不讨论通过实际活动(如研发或营销支出的酌情调整)实现的收入平滑,因为从长远来看,这些活动可能对公司绩效有害例如,如果每个员工都使用卡车或软件许可证(即对劳动力的补充),那么更大的劳动力成本粘性将导致相关卡车或软件成本的更大粘性。或者,如果公司使用暂时闲置的员工来执行通常外包给外部承包商的任务(内部劳动力的替代品),那么更大的劳动力成本粘性可能导致这些外部成本的粘性降低。为此,运营成本适当地反映了这些跨资源效应最近的文献也确定了成本表现出抗粘性的条件(如Kama和Weiss Citation2013, Banker等)。Citation2014, Chen等。Citation2019)。我们将讨论重点放在成本粘性上,因为这是一个明显更为普遍的现象,我们采用WDL的设置主要增加了劳动力的调整成本,因此导致更强的运营成本粘性未列表分析表明,成本粘性与盈余持续性呈负相关,与预管理盈余波动性和经营性现金流波动性呈正相关,进一步证明成本粘性可能会降低盈余信息性,增加事前盈余波动性。我们对预管理盈余的定义见附录B.6。从理论上讲,低成本弹性(即成本对活动增加和减少的对称反应)也可能导致高盈余波动性。然而,投资者可以预测到响应活动变化的成本变化的对称模式(Banker和Chen Citation2006)。因此,与高成本粘性不同,低成本弹性对收益的可预测性没有影响(Hutton等)。引文2012),因为它不会阻碍投资者正确评估负面冲击在销售下降期间保留未使用的资源时,管理者牺牲了当前的收益,但节省了预期的未来调整成本,从而产生了未来的经济效益。 19在未制表的试验中,我们取消了11年的窗口限制,并将处理样本的所有观察结果保持在整个35年的样本周期内,我们的推断在质量上保持相似收入平滑度量(smooth +1)的描述性统计数据与Hamm等人(Citation2018)和Tucker和Zarowin (Citation2006)等其他研究中报告的统计数据相似我们需要提醒的是,我们的回归模型与Heath等人(2022)的标准规范不同,这种差异可能会导致统计推断目的的不同临界值我们不控制列(1)和(2)中的状态固定效应,因为在控制了公司固定效应之后,状态固定效应实际上是多余的。未列示的结果表明(1)和(2)列的结果在加入状态固定效应后没有变化相对于没有自举调整的估计的标准误差(0.035),有自举调整的STICKYt的标准误差(0.074)增加了一倍以上如果公司支持或反对即将采用的WDL,他们可以自行选择迁入或迁出一个州。为了减轻这种对企业自我选择与可观察变量相关的担忧,我们在一个未制表的测试中,在熵平衡样本中重复了这两个阶段的测试。质量相似的结果减轻了企业的自我区位选择驱动我们的结果的担忧我们警告说,可自由支配的收入只包括公司可自由支配的应计利润的一部分。基于可自由支配应计利润的收入平滑度量可能会忽略管理人员用来平滑收益的其他应计利润组成部分,从而导致可能存在偏差的结果。因此,我们在主要分析中不使用这种度量我们通过将ROAt-1替换为cft -1,并根据Baik等人(Citation2020)的公式(3)和脚注17排除ROAt-1,获得了相同的推断计算不同版本EPL分数的数据和方法可在www.oecd.org/employment/protection上获得。我们使用第一个版本的EPL分数,因为它涵盖了整个样本时期。版本2只有常规合同的分数,而版本3从2008年开始覆盖,这将大大减少我们的样本量。在未制表的测试中,我们也使用版本2和3中的分数作为捕获EPL严格性的替代方法,结果在质量上是相似的未列表的结果表明,EPL分数与运营成本的其他组成部分(即运营成本减去劳动力成本)无关,这表明运营成本的结果主要反映了对劳动力成本的影响。刘俊奇感谢中国国家自然科学基金委员会(NSFC)资助,资助号为72202190,福建省社会科学基金资助,资助号为FJ2022C034,中央高校基本科研业务费资助,资助号为20720221042,以及法语国家计算机协会(AFC)的资助。所有剩下的错误都是我们自己的。
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引用次数: 0
Multiple large shareholders and cost stickiness: evidence from China 多重大股东与成本粘性:来自中国的证据
4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-11-07 DOI: 10.1080/00014788.2023.2266804
Bo Zhang, Heyu Geng, Ruixue Zhou, Limei Yang
AbstractUsing a sample of Chinese listed firms from 2001 to 2017, this study investigates the impact of multiple large shareholders (MLS) on cost stickiness from the agency costs perspective. We find a positive association between MLS and cost stickiness after controlling for various determinants of cost stickiness. The results of additional analyses suggest that coordination costs among large shareholders make it challenging to monitor managers, and stronger protection of minority shareholders helps to eliminate the effect of MLS on cost stickiness. This paper extends our understanding of the ‘dark side’ of MLS and complements existing research investigating the determinants of cost stickiness from the ownership structure perspective.Keywords: multiple large shareholdersownership structurecost stickinessJEL classification: M41G32 Disclosure statementNo potential conflict of interest was reported by the author(s).Notes1 Since selling, general, and administrative (SG&A) costs account for a main portion, most research on cost management focuses on SG&A costs. In this study, ‘cost stickiness’ and ‘SG&A cost stickiness’ are used interchangeably.2 Our study focuses on the agency-driven incentives to build empires or enjoy a quiet life inducing cost stickiness. However, agency-driven incentives to meet earnings target reduce cost stickiness (Kama and Weiss, Citation2013). Therefore, we have controlled managerial incentives to meet earnings target throughout all regressions. We thank an anonymous reviewer for the insightful comment about this issue.3 Following Jiang et al. (Citation2018), we alternatively define the large shareholder as one who owns at least 5% ownership and our results hold for using this alternative measure.4 In China, shareholders with more than 10% ownership have the right to require an interim shareholders’ meeting or a board meeting besides the regular meetings and they could put forward or vote for a proposal in these meetings.5 Obvious errors include negative total assets, negative sales, negative SG&A costs, and negative number of employees.6 To mitigate the potential influence of China’s new accounting standards adopted in 2007, we have conducted a robustness test using an alternative sample from 2007 to 2017. Our results remain robust. We thank an anonymous reviewer for the insightful suggestion about this issue.7 Following Kama and Weiss (Citation2013), the interpretations of the coefficient β4 is presented below. In model (1), the slope for the sales increase in MLS firms is β1 + α1 + α2AI + α3 EI + α4SuccessiveDecrease + α5GDP + α6FCF + α7Target. In addition, the slope for sales decrease in MLS firms is β1 + β3 + β4 + δ1AI + δ2EI + δ3SuccessiveDecrease + δ4GDP + δ5FCF + δ6Target + α1 + α2AI + α3 EI + α4SuccessiveDecrease + α5GDP + α6FCF + α7Target. Thus, cost stickiness in MLS firms is the difference between the two slopes, which equals β3 + β4 + δ1AI + δ2EI + δ3SuccessiveDecrease + δ4GDP + δ5FCF + δ6Target. Similarly, cos
摘要本文以2001 - 2017年中国上市公司为样本,从代理成本的角度考察了多大股东对成本粘性的影响。在控制成本粘性的各种决定因素后,我们发现MLS与成本粘性之间存在正相关。进一步的分析结果表明,大股东之间的协调成本使得对管理者的监督具有挑战性,而加强对小股东的保护有助于消除最小抵押贷款对成本粘性的影响。本文扩展了我们对MLS“阴暗面”的理解,并补充了从所有权结构角度调查成本粘性决定因素的现有研究。关键词:多重大股东股权结构成本粘性jel分类:M41G32披露声明作者未报告潜在利益冲突。注1由于销售、一般和行政(SG&A)成本占主要部分,因此大多数成本管理的研究都集中在SG&A成本上。在本研究中,“成本粘性”和“SG&A成本粘性”可以互换使用我们的研究重点是代理驱动的动机,以建立帝国或享受安静的生活,引起成本粘性。然而,为了实现盈利目标,代理驱动的激励会降低成本粘性(Kama和Weiss, Citation2013)。因此,我们在所有回归过程中都控制了管理层激励以达到盈利目标。我们感谢一位匿名评论者对这个问题的深刻评论根据Jiang等人(Citation2018),我们将大股东定义为拥有至少5%所有权的人,并且我们的结果适用于使用这种替代措施在中国,持股超过10%的股东有权要求在定期会议之外召开临时股东会或董事会,并可在临时股东会或董事会上提出或表决议案明显的错误包括总资产为负,销售额为负,SG&A成本为负,员工人数为负为了减轻2007年中国采用的新会计准则的潜在影响,我们使用2007年至2017年的替代样本进行了稳健性检验。我们的业绩依然强劲。我们感谢一位匿名评论者对这个问题提出的有见地的建议继Kama和Weiss (Citation2013)之后,对系数β4的解释如下。在模型(1)中,MLS企业的销售增长斜率为β1 + α1 + α2AI + α3 EI + α 4successivereduction + α5GDP + α6FCF + α7Target。此外,MLS企业的销售额下降斜率为β1 + β3 + β4 + δ1AI + δ2EI + δ 3successivereduction + δ4GDP + δ5FCF + δ6Target + α1 + α2AI + α 3ei + α 4successivereduction + α5GDP + α6FCF + α7Target。因此,MLS企业的成本粘性为两个斜率之差,等于β3 + β4 + δ1AI + δ2EI + δ 3successivereduction + δ4GDP + δ5FCF + δ6Target。同样,非mls企业的成本粘性是两个斜率之间的差,等于β3 + δ1AI + δ2EI + δ 3successivereduction + δ4GDP + δ5FCF + δ6Target。综上所述,MLS企业与非MLS企业的成本粘性差为β4,衡量MLS对成本粘性的影响根据Hartlieb等人(Citation2020),如果销售额连续两年下降,我们可以选择将变量successivereduce定义为1,否则为零,并且我们的结果适用于使用此替代措施具体而言,我们将中国的大股东分为四种类型,即金融机构股东、国有股东、个人股东和非国有公司(Cronqvist和Fahlenbrach, Citation2009;Schwartz-Ziv和Volkova, Citation2021)。原因是Cronqvist and Fahlenbrach (Citation2009)和Schwartz-Ziv and Volkova (Citation2021)将大股东分为四类,即金融机构、对冲基金、个人和非国有企业。然而,很少有对冲基金持有中国公司超过10%的股份。可能的原因是对冲基金在中国的历史较短(Li et al., Citation2011)。此外,由于中国的国有制与其他类型的国有所有制有很大的不同,我们将国有制股东作为另一种类型的大股东由于行业平均值可能与驱动企业所有权结构和成本模式的行业特征相关,因此可能存在一个潜在的担忧,即行业年平均值可能不能完全满足排除限制。因此,在解释本文中Heckman两步法的结果时应谨慎根据Banker et al. (Citation2011),我们使用从以下模型(F1)估计的(SG&A)i,t的预测值作为工具变量。(SG&A)i,t = a+b (SG&A)2 +ui,t (F1) 然后,我们在模型(F2)中包含工具变量,以获得SG&A成本价值创造的度量。(OI/TA)i,t = β0+β1 (1/TA)i,t-1+∑k = nk = 0β2,k(SG&A/TA)i,t-k+ei,t (F2),其中OI为折旧前营业收入;SG&A是指SG&A费用;TA是总资产。我们估计了每个行业(SG&A/TA)的每个滞后系数,并控制了年固定效应。我们要求系数为正且显著,并采用赤池信息准则(Akaike Information Criterion, AIC)和施瓦茨贝叶斯准则(Schwartz Bayesian Criterion, SBC)选择最佳模型。最后,这些系数以10%的贴现率折现,这些折现值的总和就是SG&A成本(FV)的价值创造。
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引用次数: 0
The effect of natural disasters on big bath earnings management of banks: evidence from the 2005 US hurricane season 自然灾害对银行巨额盈余管理的影响:来自2005年美国飓风季节的证据
4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-11-07 DOI: 10.1080/00014788.2023.2258781
Qiurong Yang, Gang Bai
AbstractWe investigate the effect of the 2005 US hurricane strikes on big bath earnings management in the banking industry. Using a difference-in-differences approach, we find that banks affected by the hurricanes add more discretionary loan loss provisions (DLLP) after the shock relative to unaffected banks. Further tests suggest that the hurricane-induced DLLP increase is attributable to opportunistic big bath accounting rather than to a precautionary motive. We also show that the effect of the hurricanes on big bath earnings management is more pronounced in banks that were managing earnings upwards more aggressively before the hurricanes.Keywords: big bath earnings managementbankingdiscretionary loan loss provisionsnatural disastersJEL classification: G21M41 AcknowledgementsWe are grateful to Juan Manuel García Lara (the editor) and two anonymous referees for their valuable and constructive suggestions. We also appreciate comments and suggestions from seminar participants at Southwestern University of Finance and Economics.Disclosure statementNo potential conflict of interest was reported by the author(s).Data availability statementThe data that support the findings of this study are available from FEMA and the Statistics on Depository Institutions database of the FDIC. These data were derived via https://www.fema.gov/disasters and https: //www.fdic.gov/bank/statistical/.Notes1 Ng and Roychowdhury (Citation2014) point out that the increase in LLPs can increase a bank’s total regulatory capital under certain conditions. We detail these conditions in Section 4.3.1.2 In Section 3.2, we detail the definition of the treatment group (affected banks) and the control group (unaffected banks).3 Following Schüwer et al. (Citation2019), non-performing loans are measured as total assets past due 90 or more days and still accruing interest. Unreported findings indicate that the results are robust when we compute non-performing loans as the sum of total assets past due 30 days or more and still accruing interest and total assets no longer accruing interest.4 In Section 3.3, we detail the procedure of PSM.5 In Section 3.3, we detail the selection of the sample period.6 Data are acquired via https://www.fdic.gov/bank/statistical/.7 Data are acquired via https://www.fema.gov/disasters.8 According to the National Bureau of Economic Research, the 2001 recession ended in November 2001, and the 2008 financial crisis started in December 2007. Thus, we limit the sample period to Q1 2002–Q3 2007 to avoid the overlap with two recessions. In the robustness section, we shorten the sample period and the results remain similar.9 Specifically, Size equals the natural logarithm of total assets. Loan (Deposit, CAP) equals total loans (total deposits, the value of equity) divided by total assets. ROA is the return on assets.10 We only include the interaction term in our regressions because we focus on future performance improvement of those treatment banks increasing DLLP in
摘要本文研究了2005年美国飓风对银行业大额盈余管理的影响。使用差异中的差异方法,我们发现受飓风影响的银行在冲击后相对于未受影响的银行增加了更多的可自由支配贷款损失准备金(DLLP)。进一步的测试表明,飓风导致的DLLP增加是由于机会主义的大浴核算,而不是出于预防动机。我们还表明,飓风对大型银行盈利管理的影响在飓风前更积极地管理盈利的银行中更为明显。关键词:大浴盈余管理银行可自由支配的贷款损失准备金自然灾害jel分类:G21M41致谢感谢Juan Manuel García Lara(编辑)和两位匿名审稿人提出的宝贵和建设性意见。我们也感谢西南财经大学研讨会参与者的意见和建议。披露声明作者未报告潜在的利益冲突。数据可用性声明支持本研究结果的数据来自联邦应急管理局和联邦存款保险公司的存款机构统计数据库。这些数据来源于https://www.fema.gov/disasters和https:// www.fdic.gov/bank/statistical/.Notes1 Ng和Roychowdhury (Citation2014)指出,在一定条件下,llp的增加可以增加银行的总监管资本。在第3.2节中,我们详细说明了实验组(受影响的银行)和对照组(未受影响的银行)的定义根据sch等人(Citation2019)的研究,不良贷款被衡量为逾期90天或更长时间且仍在产生利息的总资产。未报告的研究结果表明,当我们将不良贷款计算为逾期30天或以上仍在计息的总资产和不再计息的总资产的总和时,结果是稳健的在第3.3节中,我们详细介绍了psm的程序。5在第3.3节中,我们详细介绍了样本周期的选择根据美国国家经济研究局(National Bureau of Economic Research)的数据,2001年的经济衰退于2001年11月结束,2008年的金融危机始于2007年12月。因此,我们将样本期限制在2002年第一季度至2007年第三季度,以避免与两次衰退重叠。在稳健性部分,我们缩短了样本周期,结果仍然相似具体来说,规模等于总资产的自然对数。贷款(存款,CAP)等于贷款总额(存款总额,权益价值)除以总资产。ROA是指资产的回报率我们只在回归中包含交互项,因为我们关注的是这些处理库在应对飓风时增加DLLP的未来绩效改善。未列表的结果表明,当我们仅使用治疗组的样本并分别检查DLLP_Pos对ΔROAt+4和ΔROAt+8的影响时,结果是稳健的我们只考虑飓风之前四个季度的盈余管理,因为在此期间之前的盈余管理可能会受到前期异常拨备的影响。因此,相对于早期,最近向上的盈余管理更有可能在飓风期间被大浴会计逆转我们从沃顿研究数据服务的银行监管数据库中获得了AFS证券的已实现和未实现收益和损失的数据。13未列表的发现表明,在飓风季节前后的三季度和四个季度期间,结果是稳健的《住房抵押贷款披露法》(HMDA)的数据文件提供了有关银行向每个县发放的抵押贷款金额的信息未列表的结果表明,当我们采用总资产、总贷款和资产回报率作为匹配变量时,我们的结果仍然稳健。
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引用次数: 0
Real-time Quantification of in vivo cerebrospinal fluid velocity using fMRI inflow effect. 利用fMRI流入效应估计体内脑脊液流速
4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-11-05 DOI: 10.1101/2023.08.14.553250
Tyler C Diorio, Vidhya Vijayakrishnan Nair, Neal M Patel, Lauren E Hedges, Vitaliy L Rayz, Yunjie Tong

In vivo estimation of cerebrospinal fluid (CSF) velocity is crucial for understanding the glymphatic system and its potential role in neurodegenerative disorders such as Alzheimer's disease and Parkinson's disease. Current cardiac or respiratory gated approaches, such as 4D flow MRI, cannot capture CSF movement in real time due to limited temporal resolution and in addition deteriorate in accuracy at low fluid velocities. Other techniques like real-time PC-MRI or time-spatial labeling inversion pulse are not limited by temporal averaging but have limited availability even in research settings. This study aims to quantify the inflow effect of dynamic CSF motion on functional magnetic resonance imaging (fMRI) for in vivo, real-time measurement of CSF flow velocity. We considered linear and nonlinear models of velocity waveforms and empirically fit them to fMRI data from a controlled flow experiment. To assess the utility of this methodology in human data, CSF flow velocities were computed from fMRI data acquired in eight healthy volunteers. Breath holding regimens were used to amplify CSF flow oscillations. Our experimental flow study revealed that CSF velocity is nonlinearly related to inflow effect-mediated signal increase and well estimated using an extension of a previous nonlinear framework. Using this relationship, we recovered velocity from in vivo fMRI signal, demonstrating the potential of our approach for estimating CSF flow velocity in the human brain. This novel method could serve as an alternative approach to quantifying slow flow velocities in real time, such as CSF flow in the ventricular system, thereby providing valuable insights into the glymphatic system's function and its implications for neurological disorders.

体内脑脊液(CSF)流速的估计对于了解淋巴系统及其在神经退行性疾病(如阿尔茨海默病、帕金森病和多发性硬化症)中的潜在作用至关重要。目前的心脏或呼吸门控入路,如4D Flow MRI,由于时间分辨率有限,无法实时捕获CSF运动,而且在低流体速度下准确性会下降。其他技术如实时PC-MRI或时空标记反转脉冲不受时间平均的限制,但即使在研究环境中也有限。本研究旨在量化动态脑脊液运动对功能磁共振成像(fMRI)的流入效应,用于体内实时测量脑脊液流速。我们考虑了速度波形的线性和指数模型,并经验地将它们拟合到控制流实验的功能磁共振成像数据中。为了评估该方法在人体数据中的实用性,我们从8名健康志愿者的fMRI数据中计算了脑脊液的流速。屏气方案用于放大脑脊液血流振荡。我们的实验流动研究表明,脑脊液流速与流入效应介导的信号增加呈指数相关。利用这种关系,我们从体内fMRI信号中恢复了速度,证明了我们估计人脑CSF流速的方法的潜力。这种新方法可以作为实时定量慢血流速度的替代方法,例如脑室系统的脑脊液流量,从而为淋巴系统的功能及其对神经系统疾病的影响提供有价值的见解。
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引用次数: 0
Reducing partner risk: the effect of feedback timing and incentives 降低合作伙伴风险:反馈时机和激励措施的影响
IF 1.7 4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-09-07 DOI: 10.1080/00014788.2023.2241135
Karen J. De Meyst, E. Cardinaels, Alexandra G. H. L. Van den Abbeele
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引用次数: 0
Short selling pressure and tone management: evidence from regulation SHO 卖空压力与基调管理:来自SHO监管的证据
IF 1.7 4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-08-08 DOI: 10.1080/00014788.2023.2227567
Ruichang Lu, Tenghui Wang, Xiaojun Zhang
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引用次数: 0
Tax systems: adaptability and resilience during a global pandemic 税收制度:全球大流行期间的适应性和复原力
IF 1.7 4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-07-29 DOI: 10.1080/00014788.2023.2219151
Stephen Daly
The tax system is traditionally understood as being geared primarily, but not exclusively, towards the raising of revenues. Taxes perform distributive and regulatory roles for instance. Furthermore, the tax system can also be engaged for the purpose of providing stability in times of uncertainty and for providing key information to government so that its policies (whether economic, social, health, environmental and so on) can be pursued. With its multivarious capabilities, it would be of little surprise to learn that governments turned to the tax system during the COVID-19 pandemic in order to alleviate the economic consequences of the emergency. The paper sets out to investigate the ways the tax system was used in response to the pandemic. It narrows in on two key findings: that the tax system was instrumental in providing stability and also in providing salient information for government use. A picture of the tax system as being adaptable and resilient is painted. But the key findings of the paper are not made without reservation.
传统上认为,税收制度主要是为了增加收入,但并非完全是为了增加收入。例如,税收起着分配和调节的作用。此外,还可以利用税收制度在不确定时期提供稳定,并向政府提供关键信息,以便执行其政策(无论是经济、社会、卫生、环境等)。鉴于税收系统的多种功能,在2019冠状病毒病大流行期间,各国政府转向税收系统以减轻紧急情况的经济后果,这不足为奇。该文件着手调查税收制度在应对疫情时的使用方式。它集中在两个关键发现上:税收制度在提供稳定性和为政府提供重要信息方面发挥了重要作用。他们描绘了一幅税收制度具有适应性和弹性的画面。但该论文的主要发现并非毫无保留。
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引用次数: 0
‘Access to finance: adaptability and resilience during a global pandemic’ A practitioner view "获得资金:全球大流行病期间的适应能力和复原力"
IF 1.7 4区 管理学 Q2 BUSINESS, FINANCE Pub Date : 2023-07-29 DOI: 10.1080/00014788.2023.2219157
Roslyn Gamsa
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引用次数: 0
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Accounting and Business Research
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