Complex psychiatry最新文献_第9页

Blockchain-Driven Supply Chain's Financing and Coordination Strategy under Nash Bargaining Scheme 纳什议价方案下区块链驱动供应链的融资与协调策略

Complex psychiatry

Pub Date : 2023-02-22 DOI: 10.1155/2023/9670398

Dan Tang

Blockchain-driven supply chain finance (SCF) has become an emerging supply chain financing mode. Compared with the traditional SCF mode, blockchain-driven SCF can shorten the transaction process and provide real trade data that cannot be tampered with, thereby improving the efficiency of capital operation. This article explores the financing and coordination problems of a blockchain-driven supply chain. Based on the three most common supply chain contracts (revenue-sharing contract, profit-sharing contract, and two-part tariff contract), we construct a comparative model of bank credit financing (BCF) and blockchain-driven SCF, discuss the optimal decision-making strategy of the supply chain, and quantitatively analyze the performance of supply chain under each mode. The results show the following: (i) there is a threshold for the usage rate of the blockchain-driven SCF platform; (ii) only when the platform usage rate is lower than the threshold, the blockchain-driven SCF mode which benefits both manufacturer and retailer is a better choice; (iii) the above results always hold if supply chain contracts can coordinate the supply chain in terms of quantity decisions; (iv) the blockchain-driven SCF mode is more efficient for supply chains which are less capital-constrained. This article provides a decision basis for the selection of supply chain financing channels and provides an idea for future research on blockchain-driven SCF.

区块链驱动的供应链金融(SCF)已经成为一种新兴的供应链融资模式。与传统的SCF模式相比，区块链驱动的SCF可以缩短交易流程，提供真实的不可篡改的交易数据，从而提高资本运作效率。本文探讨了区块链驱动供应链的融资和协调问题。基于三种最常见的供应链契约(收益共享契约、利润共享契约和两部分关税契约)，构建了银行信贷融资(BCF)和区块链驱动的供应链契约的比较模型，讨论了供应链的最优决策策略，并定量分析了每种模式下供应链的绩效。结果表明:(1)区块链驱动SCF平台的使用率存在阈值;(ii)只有当平台使用率低于阈值时，区块链驱动的SCF模式才是更好的选择，这对制造商和零售商都有利;(iii)如果供应链合同在数量决策方面能够协调供应链，则上述结果始终成立;(iv)区块链驱动的SCF模式对于资本约束较少的供应链来说效率更高。本文为供应链融资渠道的选择提供决策依据，为未来区块链驱动供应链金融的研究提供思路。

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引用次数: 0

Addressing Emotional Dysregulation and Potential Pharmacogenetic Implication of 5-HTTLPR Genotype in Attention Deficit Hyperactivity Disorder. 解决注意力缺陷多动障碍中的情绪失调和 5-HTTLPR 基因型的潜在药物遗传学影响。

Complex psychiatry

Pub Date : 2023-02-21 eCollection Date: 2023-01-01 DOI: 10.1159/000529732

Hao Xuan Tan, Adam Md Kamal, Sivakumar Thurairajasingam, Maude Elvira Phipps

Background: This review unpacks the emotional presentation of externalizing behaviors in attention deficit hyperactivity disorder (ADHD), by diving into the psychophysiology, neurophysiology, and neurogenetics in relation to executive function. The correlations among these three variables are identified, showing that standard assessments for ADHD leave out the emotional dysregulation element. This may lead to suboptimal management outcomes during the developmental progression into adolescence and adulthood.

Summary: The emotional impulsivity manifestation in adolescence and adulthood related to the under-managed emotional dysregulation in childhood is found to be associated with subtle confounding impact of 5-HTTLPR (serotonin-transporter-linked promoter region) genotype. The genotype of interest affects the neurochemistry, neurophysiology, and psychophysiology of the cognition for executive function. The established practice of using methylphenidate in treating ADHD surprisingly has a neurogenetic effect in targeting the genotype of interest. Methylphenidate provides neuroprotective effects throughout the neurodevelopment timeline from childhood to adulthood.

Key messages: The emotional dysregulation element in ADHD which is often overlooked should be addressed to improve the prognostic outcomes in adolescence and adulthood.

背景：这篇综述通过深入研究与执行功能相关的心理生理学、神经生理学和神经遗传学，揭示了注意力缺陷多动障碍（ADHD）患者外化行为的情绪表现。研究确定了这三个变量之间的相关性，表明对注意力缺陷多动障碍（ADHD）的标准评估忽略了情绪失调这一因素。摘要：研究发现，青少年期和成年期的情绪冲动表现与儿童期未得到充分管理的情绪失调有关，这与 5-HTTLPR（5-羟色胺转运体连接启动子区域）基因型的微妙混杂影响有关。相关基因型会影响执行功能认知的神经化学、神经生理学和心理生理学。使用哌醋甲酯治疗多动症的既有做法在针对相关基因型方面竟然具有神经遗传学效应。哌醋甲酯在从童年到成年的整个神经发育过程中都具有神经保护作用：关键信息：多动症中的情绪失调因素常常被忽视，应加以解决，以改善青少年和成年期的预后。

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引用次数: 1

Fluid Flow Behavior Prediction in Naturally Fractured Reservoirs Using Machine Learning Models 利用机器学习模型预测天然裂缝性油藏的流体流动行为

Complex psychiatry

Pub Date : 2023-02-20 DOI: 10.1155/2023/7953967

Mustafa Mudhafar Shawkat, A. R. Risal, Noor J. Mahdi, Ziauddin Safari, Maryam H. Naser, A. A. Zand

The naturally fractured reservoirs are one of the most challenging due to the tectonic movements that are caused to increase the permeability and conductivity of the fractures. The instability of the permeability and conductivity effects on the fluid flow path causes problems during the transfer of the fluids from the matrix to the fractures and fluid losses during production. In addition, these complications made it difficult for engineers to estimate fluid flow during production. The fracture properties’ study is important to model the fluid flow paths such as the fracture porosity, permeability, and the shape factor, which are considered essential in the stability of fluid flow. To examine this, this research introduced new models including decision tree (DT), random forest (RF), K-nearest regression (KNR), ridge regression (RR), and LASSO regression model,. The research studied the fracture properties in naturally fractured reservoirs like the fracture porosity (FP) and the shape factor (SF). The datasets used in this study were collected from previous studies “i.e., Texas oil and gas fields” to build an intelligence-based predictive model for fluid flow characteristics. The prediction process was conducted based on interporosity flow coefficient, storativity ratio, wellbore radius, matrix permeability, and fracture permeability as input data. This study revealed a positive finding for the adopted machine learning (ML) models and was superior in using statistical accuracy metrics. Overall, the research emphasized the implementation of computer-aided models for naturally fractured reservoir analysis, giving more details on the extensive execution techniques, such as injection or the creation of artificial cracks, to minimize hydrocarbon losses or leakage.

由于构造运动导致裂缝的渗透率和导流能力增加，天然裂缝性储层是最具挑战性的储层之一。渗透率和导电性的不稳定性对流体流动路径的影响导致了流体从基质向裂缝的转移过程中的问题以及生产过程中的流体损失。此外，这些复杂性使得工程师难以估计生产过程中的流体流动。裂缝性质的研究对于模拟流体流动路径(如裂缝孔隙度、渗透率和形状因子)具有重要意义，这些因素对流体流动的稳定性至关重要。为此，本研究引入了决策树(DT)、随机森林(RF)、k -最近回归(KNR)、岭回归(RR)和LASSO回归模型等新模型。研究了天然裂缝性储层的裂缝性质，如裂缝孔隙度(FP)和形状因子(SF)。本研究中使用的数据集收集自之前的研究(即德克萨斯州油气田)，以建立基于智能的流体流动特性预测模型。预测过程基于孔隙间流动系数、储气性比、井筒半径、基质渗透率和裂缝渗透率作为输入数据。该研究揭示了采用机器学习(ML)模型的积极发现，并且在使用统计准确性指标方面具有优越性。总体而言，该研究强调了自然裂缝油藏分析的计算机辅助模型的实施，提供了更多关于广泛执行技术的细节，例如注入或制造人工裂缝，以尽量减少碳氢化合物的损失或泄漏。

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引用次数: 0

A New Guess-and-Determine Method for Cryptanalysis of the GSM Encryption GSM加密分析中一种新的猜测-确定方法

Complex psychiatry

Pub Date : 2023-02-18 DOI: 10.1155/2023/7249127

Ashish Jain, I. Kaur, Akhilesh Kumar Sharma, N. Gupta, Partha Chakraborty

Cryptanalysis is the process of finding flaws or oversights in an encryption algorithm. Nearly, all encryption algorithms are carefully examined through cryptanalysis to determine the security of the system in which the encryption algorithm has been employed. A5/1 is a well-known encryption algorithm which is inbuilt in mobile phone for securing GSM communication, and therefore, cryptanalysis of this algorithm is also important. A5/1 consists of three linear feedback registers of lengths 23, 22, and 19 bits. Due to the nonlinear clocking mechanism of A5/1, cryptanalytic attacks of guess-and-determine (GD) nature are efficient and more successful. In this paper, we propose a new low keystream GD attack on GSM encryption algorithm A5/1. The basic idea of GD attack is guessing some portion of the registers of A5/1 and determining remaining portion of the registers via the relationship between the register’s state and the known intercepted keystream. The guessed and determined register’s state is validated by running the cipher forward from that state. If the intercepted keystream matches the generated keystream, we accept it. Otherwise, we discard and try the attack again. The computational complexity and the success rate of the proposed attack are O 2 52 and 96.6%, respectively.

密码分析是在加密算法中发现缺陷或疏忽的过程。几乎所有的加密算法都是通过密码分析来仔细检查的，以确定采用加密算法的系统的安全性。A5/1是一种众所周知的用于保护GSM通信安全的内置加密算法，因此对该算法的密码分析也很重要。A5/1由三个长度为23、22和19位的线性反馈寄存器组成。由于A5/1的非线性时钟机制，猜测和确定(GD)性质的密码分析攻击是高效和成功的。本文提出了一种新的针对GSM加密算法A5/1的低密钥流GD攻击方法。GD攻击的基本思想是猜测A5/1寄存器的一部分，并通过寄存器状态与已知截获密钥流之间的关系确定寄存器的剩余部分。通过从该状态向前运行密码来验证猜测和确定的寄存器状态。如果拦截的密钥流与生成的密钥流匹配，我们就接受它。否则，我们放弃并再次尝试攻击。该算法的计算复杂度和攻击成功率分别为0.52%和96.6%。

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引用次数: 1

Impact of High-Frequency Trading with an Order Book Imbalance Strategy on Agent-Based Stock Markets 高频交易与订单不平衡策略对基于代理的股票市场的影响

Complex psychiatry

Pub Date : 2023-02-17 DOI: 10.1155/2023/3996948

Isao Yagi, Mahiro Hoshino, Takanobu Mizuta

It is known that there is a positive correlation between order book imbalance and future returns. Although some previous studies using actual trading data have suggested that high-frequency trading (HFT) may take this characteristic into account, HFT firms have not disclosed their specific strategies. Furthermore, there has been a long-standing debate in the empirical research field as to whether HFT is the cause of flash crashes, but no final conclusion has been reached. In the present study, we analysed the impacts of HFT taking into account the correlation between order book imbalance and future returns on a stable market and on a market with a flash crash, using agent-based simulations, which are said to be capable of analysing events in their essence. We also analysed how HFT investment performance differs between those two market conditions. The results showed that HFT has the effect of further stabilizing the market when the market is stable but does not take place during flash crashes and so is unable to affect the market either for the good or the bad. The results also suggest that the proposed HFT’s performance is more sensitive to market price fluctuations than conventional HFT (i.e., HFT following a position market-making strategy) and tends to have high risk and high returns.

已知订单不平衡与未来收益呈正相关关系。尽管先前一些使用实际交易数据的研究表明，高频交易(HFT)可能会考虑到这一特征，但高频交易公司并没有披露他们的具体策略。此外，在实证研究领域，关于高频交易是否是闪电崩盘的原因一直存在争论，但尚未得出最终结论。在本研究中，我们分析了高频交易的影响，考虑了稳定市场和闪电崩盘市场上订单不平衡与未来回报之间的相关性，使用基于代理的模拟，据说能够从本质上分析事件。我们还分析了这两种市场条件下高频交易投资表现的差异。结果表明，高频交易在市场稳定时具有进一步稳定市场的作用，但不发生在闪崩期间，因此无法影响市场的好坏。结果还表明，与传统高频交易(即遵循仓位做市策略的高频交易)相比，所提出的高频交易的表现对市场价格波动更为敏感，并且往往具有高风险和高回报。

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引用次数: 1

Hyperarousal Symptom Severity in Women with Posttraumatic Stress Disorder Might Be Associated with LINE-1 Hypomethylation in Childhood Sexual Abuse Victims. 创伤后应激障碍女性的过度焦虑症状严重程度可能与童年性虐待受害者体内 LINE-1 基因的低甲基化有关

Complex psychiatry

Pub Date : 2023-02-15 eCollection Date: 2023-01-01 DOI: 10.1159/000529698

Carolina Muniz Carvalho, Bruno Messina Coimbra, Amanda Bugiga, Diogo Ferri Marques, Vanessa Kiyomi Ota, Andrea Feijó Mello, Marcelo Feijó Mello, Sintia Iole Belangero

Introduction: Sexual assault and a history of childhood sexual abuse (CSA) are related to posttraumatic stress disorder (PTSD) development. Long interspersed nuclear elements (LINE-1) are transposable elements, and their methylation is used to infer DNA global methylation. DNA methylation can be affected by trauma exposition which in turn would be associated with PTSD. Thus, we investigated if the LINE-1 methylation pattern is related to PTSD symptoms in females with a history of CSA.

Methods: This is a case-control study that examined, at baseline (W1), 64 women victims of sexual assault diagnosed with PTSD and 31 patients with PTSD who completed the 1-year follow-up (W2). Participants were categorized into two groups according to the presence of CSA (PTSDCSA+: NW1 = 19, NW2 = 10; PTSDCSA-: NW1 = 45, NW2 = 21). PTSD symptoms (re-experiencing, avoidance, hyperarousal, alterations in cognition/mood) were assessed using the Clinician-Administered PTSD Scale, and the history of CSA was assessed by the Childhood Trauma Questionnaire. LINE-1 methylation was measured in three sites (CpG1, CpG2, CpG3) located in the 5'UTR region using bisulfite conversion followed by pyrosequencing. Linear regression models were performed to test the relation between LINE-1 CpG sites methylation and PTSD symptoms.

Results: We found a negative association between CpG2 methylation and hyperarousal symptoms among those in the PTSDCSA+ group in W1 (adjusted p = 0.003) compared to the PTSDCSA- group (p > 0.05). Still, no association was observed between other PTSD symptoms and other CpG sites. Further, in the longitudinal analysis, LINE-1 hypomethylation was no longer observed in PTSD participants exposed to CSA.

Conclusion: Our findings suggest that LINE-1 methylation may help understand the relationship between trauma and PTSD. However, more studies are needed to investigate LINE-1 as an epigenetic marker of psychiatric disorders.

导言：性侵犯和童年性虐待（CSA）史与创伤后应激障碍（PTSD）的发展有关。长穿插核元素（LINE-1）是一种转座元件，其甲基化可用于推断 DNA 的全局甲基化。DNA甲基化会受到创伤暴露的影响，而创伤暴露又会与创伤后应激障碍有关。因此，我们研究了LINE-1甲基化模式是否与有CSA史的女性的创伤后应激障碍症状有关：这是一项病例对照研究，对基线（W1）时被诊断为创伤后应激障碍的 64 名女性性侵犯受害者和完成 1 年随访（W2）的 31 名创伤后应激障碍患者进行了研究。根据是否存在 CSA 将参与者分为两组（PTSDCSA+：NW1 = 19，NW2 = 10；PTSDCSA-：NW1 = 45，NW2 = 21）。创伤后应激障碍症状（再体验、回避、过度焦虑、认知/情绪改变）通过临床医师管理的创伤后应激障碍量表进行评估，CSA史通过童年创伤问卷进行评估。利用亚硫酸氢盐转化法和热释光测序法测量了位于5'UTR区域的三个位点（CpG1、CpG2和CpG3）的LINE-1甲基化情况。通过线性回归模型检验了LINE-1 CpG位点甲基化与创伤后应激障碍症状之间的关系：结果：我们发现，与 PTSDCSA- 组（p > 0.05）相比，W1 组中 PTSDCSA+ 组的 CpG2 甲基化与过度焦虑症状呈负相关（调整后 p = 0.003）。然而，在其他创伤后应激障碍症状和其他 CpG 位点之间没有观察到任何关联。此外，在纵向分析中，暴露于 CSA 的创伤后应激障碍参与者中不再观察到 LINE-1 低甲基化：我们的研究结果表明，LINE-1甲基化可能有助于理解创伤与创伤后应激障碍之间的关系。结论：我们的研究结果表明，LINE-1甲基化可能有助于理解创伤与创伤后应激障碍之间的关系，但还需要更多的研究来探讨LINE-1作为精神疾病表观遗传标记的作用。

{"title":"Hyperarousal Symptom Severity in Women with Posttraumatic Stress Disorder Might Be Associated with LINE-1 Hypomethylation in Childhood Sexual Abuse Victims.","authors":"Carolina Muniz Carvalho, Bruno Messina Coimbra, Amanda Bugiga, Diogo Ferri Marques, Vanessa Kiyomi Ota, Andrea Feijó Mello, Marcelo Feijó Mello, Sintia Iole Belangero","doi":"10.1159/000529698","DOIUrl":"10.1159/000529698","url":null,"abstract":"Introduction: Sexual assault and a history of childhood sexual abuse (CSA) are related to posttraumatic stress disorder (PTSD) development. Long interspersed nuclear elements (LINE-1) are transposable elements, and their methylation is used to infer DNA global methylation. DNA methylation can be affected by trauma exposition which in turn would be associated with PTSD. Thus, we investigated if the LINE-1 methylation pattern is related to PTSD symptoms in females with a history of CSA.Methods: This is a case-control study that examined, at baseline (W1), 64 women victims of sexual assault diagnosed with PTSD and 31 patients with PTSD who completed the 1-year follow-up (W2). Participants were categorized into two groups according to the presence of CSA (PTSDCSA+: NW1 = 19, NW2 = 10; PTSDCSA-: NW1 = 45, NW2 = 21). PTSD symptoms (re-experiencing, avoidance, hyperarousal, alterations in cognition/mood) were assessed using the Clinician-Administered PTSD Scale, and the history of CSA was assessed by the Childhood Trauma Questionnaire. LINE-1 methylation was measured in three sites (CpG1, CpG2, CpG3) located in the 5'UTR region using bisulfite conversion followed by pyrosequencing. Linear regression models were performed to test the relation between LINE-1 CpG sites methylation and PTSD symptoms.Results: We found a negative association between CpG2 methylation and hyperarousal symptoms among those in the PTSDCSA+ group in W1 (adjusted p = 0.003) compared to the PTSDCSA- group (p > 0.05). Still, no association was observed between other PTSD symptoms and other CpG sites. Further, in the longitudinal analysis, LINE-1 hypomethylation was no longer observed in PTSD participants exposed to CSA.Conclusion: Our findings suggest that LINE-1 methylation may help understand the relationship between trauma and PTSD. However, more studies are needed to investigate LINE-1 as an epigenetic marker of psychiatric disorders.","PeriodicalId":72654,"journal":{"name":"Complex psychiatry","volume":"9 1-4","pages":"44-56"},"PeriodicalIF":0.0,"publicationDate":"2023-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10080193/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"10376526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Time-Frequency Connectedness between Shariah Indices in a Systemic Crisis Era 系统性危机时代伊斯兰教法指数的时频关联性

Complex psychiatry

Pub Date : 2023-02-13 DOI: 10.1155/2023/5602895

Shafi Madhkar Alsubaie, Khaled H. Mahmoud, Emmanuel Asafo-Adjei, A. Bossman

We examine the time- and frequency-domain spillover connectedness between regional and world Shariah indices. The spillover index approach is employed with data over the period from April 30, 2012, to May 9, 2022, for African, American, Asian, European, and world emerging and developed markets’ Shariah-based equity indices. The results indicate significant time- and frequency-dependent spillovers between Shariah indices. The world and developed markets’ Shariah indices transmit the greatest return spillover to their African and Asian counterparts, which act as net recipients of system spillovers. Our findings show that Asian Shariah assets are a perfect hedge against all relevant market shocks over the last decade. Our findings have implications for Shariah market regulators, investors, practitioners, and policymakers.

我们研究了区域和世界伊斯兰教法指数之间的时间和频域溢出连通性。溢出指数方法采用了2012年4月30日至2022年5月9日期间的数据，涵盖了非洲、美洲、亚洲、欧洲以及世界新兴市场和发达市场的伊斯兰教股票指数。结果表明，伊斯兰教法指数之间存在显著的时间和频率依赖的溢出效应。世界和发达市场的伊斯兰教法指数将最大的回报溢出效应传递给了它们的非洲和亚洲同行，它们是体系溢出效应的净接受者。我们的研究结果表明，在过去十年中，亚洲的伊斯兰教资产是对所有相关市场冲击的完美对冲。我们的研究结果对伊斯兰教法市场监管机构、投资者、从业者和政策制定者具有启示意义。

引用次数: 1

Fractional Gradient Descent-Based Auxiliary Model Algorithm for FIR Models with Missing Data 基于分数梯度下降的FIR缺失模型辅助模型算法

Complex psychiatry

Pub Date : 2023-02-09 DOI: 10.1155/2023/7527478

Jia-Wei Tang

This study proposes a fractional gradient descent (FGD) algorithm for FIR models with missing data. By using the auxiliary model method, the missing data can be obtained. Then, the FGD algorithm is applied to update the parameters of the FIR models. Because of the fractional term in the conventional GD algorithm, the convergence rates of the GD algorithm can be increased. In addition, to avoid the step-size calculation, an Aitken FGD-based auxiliary model algorithm is also introduced. The convergence analysis and simulation examples are provided to show the effectiveness of the proposed algorithms.

本文提出了一种分数梯度下降(FGD)算法，用于数据缺失的FIR模型。利用辅助模型法，可以得到缺失的数据。然后，应用FGD算法对FIR模型参数进行更新。由于传统遗传算法中存在分数阶项，使得遗传算法的收敛速度得到提高。此外，为了避免步长计算，还引入了一种基于Aitken fgd的辅助模型算法。通过收敛性分析和仿真算例验证了所提算法的有效性。

引用次数: 1

Travel Matrix Decomposition for Understanding Spatial Long-Distance Travel Structure 基于旅行矩阵分解的空间长途旅行结构研究

Complex psychiatry

Pub Date : 2023-02-08 DOI: 10.1155/2023/1090277

Hiromichi Yamaguchi, Mashu Shibata, Shoichiro Nakayama

Mobile phone location data enable us to obtain accurate and temporally detailed long-distance travel distribution. However, the traditional long-distance travel distribution model cannot normally handle this detailed temporal information. This study proposes an approach for handling temporally detailed information of long-distance travel distribution. Considering this approach, the origin-destination matrix decomposes into two variables (indicators): destination amenity and travel cost. They can be interpreted as composite indicators of several variables that are treated in the travel-destination choice multinomial logit model. Because they are calculated only from the origin destination, we can discuss their detailed temporal variations. In this study, time changes in destination amenities and travel costs of interprefectural travel in Japan are calculated to confirm the value of this approach. These indicators have succeeded in describing the pattern of domestic long-distance travel in Japan. These quantified indicators have facilitated the understanding of the national land structure. They are useful as outcome measures for policy-making. Moreover, these indicators explain the temporal applicability of the destination choice model. Specifically, the results of destination amenities have a large seasonal variation. This indicates that the parameters of the destination amenity model (i.e., the coefficients of the destination variables) are not seasonally stable. Therefore, this must be considered when dealing with destination choice for long-distance travel.

手机定位数据使我们能够获得准确的、时间上详细的长途旅行分布。然而，传统的长途旅行分布模型无法正常处理这些详细的时间信息。本研究提出了一种处理长途旅行分布时间细节信息的方法。考虑到这种方法，起点-目的地矩阵分解为两个变量(指标):目的地舒适度和旅行成本。它们可以被解释为在旅游目的地选择多项逻辑模型中处理的几个变量的复合指标。因为它们只从原点和目的地计算，所以我们可以详细讨论它们的时间变化。在本研究中，计算了目的地便利设施的时间变化和日本解说旅行的旅行成本，以确认该方法的价值。这些指标成功地描述了日本国内长途旅行的模式。这些量化指标有助于了解国家土地结构。它们可以作为决策的结果衡量标准。此外，这些指标解释了目的地选择模型的时间适用性。具体来说，目的地便利设施的结果有很大的季节变化。这说明目的地舒适度模型的参数(即目的地变量的系数)不具有季节稳定性。因此，在选择长途旅行的目的地时，必须考虑到这一点。

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引用次数: 0

Extended Framework for Preventive Maintenance Planning: Risk and Behaviour Analysis of a Proposed Optimization Model 预防性维修计划的扩展框架:提出的优化模型的风险和行为分析

Complex psychiatry

Pub Date : 2023-02-08 DOI: 10.1155/2023/2701439

P. Viveros, Marco Espinoza, R. Mena, F. Kristjanpoller

The considerable increase in the complexity associated with the formulation of maintenance plans has enabled the development of new techniques to bring maintenance scheduling optimization models to more realistic environments. In this sense, a previous optimization model was proposed considering the use of time windows for the formation of grouping schemes under an opportunistic strategy for maintenance activities considering non-negligible execution times, thus offering the possibility of analysing scenarios with limited resources. This article proposes a risk analysis based on the failure probability of each component involved in the maintenance scheduling optimization model, which has the particularity of enabling a greater number of combinations of grouped PM activities. Moreover, it seeks to identify the general behaviour of the optimization model against different scenarios of periodicities and execution times of each maintenance activity. The proposed optimization model is formulated under a mixed integer linear programming (MILP) paradigm and its objective function seeks to minimize the unavailability of the system associated with the execution times of the activities developed, generating different experimental cases, and varying the start time scheduling under a tolerance factor from 0% up to a maximum of 25% for advance or delay. Results show in contrast with the base optimization model, an 8% less unavailability when the tolerance factor is 10%. Finally, it was possible to quantify the risk present in each maintenance schedule, at the same time a behaviour towards advancing PM activities is evidenced by the optimization model proposed over the delay.

与维护计划制定相关的复杂性的显著增加使得新技术的发展能够将维护计划优化模型带到更现实的环境中。在这个意义上，先前提出的优化模型考虑了在考虑不可忽略的执行时间的维护活动的机会主义策略下使用时间窗口来形成分组方案，从而提供了在有限资源下分析场景的可能性。本文提出了一种基于维护计划优化模型中涉及的每个组件的故障概率的风险分析，该模型具有支持更多组合的组合PM活动的特殊性。此外，它还试图确定针对每个维护活动的周期性和执行时间的不同场景的优化模型的一般行为。所提出的优化模型是在混合整数线性规划(MILP)范式下制定的，其目标函数旨在最小化与所开发活动的执行时间相关的系统不可用性，生成不同的实验案例，并在提前或延迟的容差因子从0%到最大25%的范围内改变启动时间调度。结果表明，与基本优化模型相比，当容差系数为10%时，不可用性降低8%。最后，有可能量化每个维护计划中存在的风险，同时，在延迟上提出的优化模型证明了推进PM活动的行为。

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引用次数: 1