A Time Dependent Inventory Model for Exponential Demand Rate with Constant Production Where Shelf-Life of the Product Is Finite

In this paper a time dependent inventory model is developed on the basis of constant production rate and market demands which are exponentially decreasing. It advances in quest of total average optimum cost considering those products which have finite shelf-life. The model also considers the small amount of decay. Without having any sort of backlogs, production starts. Reaching at the desired level of inventories, it stops production. After that due to demands along with the deterioration of the items it initiates its depletion and after certain periods the inventory gets zero. The decay of the products is level dependent. The objective of this paper is to find out the optimum inventory cost and optimum time cycle. The model has also been justified with proving the convex property and by giving a numerical example.

Energy Demand Growth Rate to Slow Down

China’s energy demand growth rate is expected to slow down next year, with the government’s efforts to curb energy consumption intensive industries taking effect, executives from State oil and power companies said yesterday. Refined oil product consumption in China is likely

TRANSFORM THE MECHANISM OF RENMINBI’S EXCHANGE RATE SYSTEM IN CONFORMITY WITH THE DEMAND OF MARKET ECONOMY——The academic report delivered at the Annual Meeting of NNCIFS on October 1993

Exchange rate functions under systems of centrallyplanned economy and market economy are quite different,and the mechanism to determine such exchange rate is alsodifferent. To adopt a socialist market economic system inChina, the exchange rate mechanism of Renminbi must bethoroughly transformed. To accomplish this goal, I believethere are three problems that must be solved: first,

An Optimal Policy with Quadratic Demand, Three-Parameter Weibull Distribution Deterioration Rate, Shortages and Salvage Value

The present paper focuses an optimal policy of an inventory model for deteriorating items with generalized demand rate and deterioration rate. Shortages are allowed and partially backlogged. The salvage value is included into deteriorated units. The main objective of the model is to minimize the total cost by optimizing the value of the shortage point, cycle length and order quantity. A numerical example is carried out to illustrate the model and sensitivity analyses of major parameters are discussed.

An Ordering Policy for Deteriorating Items with Time-Dependent Quadratic Demand and Salvage Value under Permissible Delay in Payment

The article deals with an economic order quantity (EOQ) inventory model for deteriorating items in which the supplier provides the purchaser a permissible delay in payment. This is so when deterioration of units in the inventory is subject to constant deterioration rate, demand rate is quadratic function of time and salvage value is associated with the deteriorated units. Shortages in the system are not allowed to occur. A mathematical formulation is developed when the supplier offers a permissible delay period to the customers under two circumstances: 1) when delay period is less than the cycle of time;and 2) when delay period is greater than the cycle of time. The method is suitable for the items like state-of-the-art aircrafts, super computers, laptops, android mobiles, seasonal items and machines and their spare parts. A solution procedure algorithm is given for finding the optimal order quantity which minimizes the total cost of an inventory system. The article includes numerical examples to support the effectiveness of the developed model. Finally, sensitivity analysis on some parameters on optimal solution is provided.

低出生率背景下省域学前教育资源供需关系与动态调配——基于对中部J省人口预测的分析

低出生率背景下研判省域学前教育资源供需关系的变化,对优化学前教育资源配置、实现学前教育优质均衡发展具有指导意义。本研究选择省域学前教育资源配置中低供给高需求类型的中部J省作为研究对象,运用PADIS-INT软件预测分析了J省2023—2035年低、中、高三种方案下城乡在园幼儿人数的变化,调查了J省学前教育人力资源与物力资源供给现状,进而预测分析了J省学前教育资源在供给动态变化与静态不变情况下的供需关系。结果发现,随着在园幼儿人数减少,学前教育资源需求将明显减少;现有人力资源供给存在结构性短缺,未来会出现城乡配置失衡;物力资源配备已达到高水平,未来会严重过剩。根据研究结果,建议地方政府根据资源供需关系的动态变化做好学前教育长期规划,控增量、调存量、疏余量;从结构与质量入手优化人力资源配置,稳定乡村教师队伍;谨慎增加办园条件投入,采用多种形式提升物力资源使用效益。

An Inventory Model of Production with Level Dependent Demand Allowing Few Defective Items

This paper considers a model regarding the products with finite life which allows defective items in reproduction and causes a small amount of decay. The market demand is assumed to be level dependent linear type. The model has also considered the constant production rate which stops after a desired level of inventories and that is the highest level of it. Due to the market demand, defective item and product’s decay, the inventory reduces to the zero level where again the production cycle starts. With a numerical search procedure, the proof of the proposed model has been shown. The objective of the proposed model is to find out the total optimum inventory cost, optimum ordering cost and optimum ordering cycle.

Research on Sales Strategy Based on Supermarket Pipeline Data

“Low profit and high sales” is a strategy to increase sales volume by reducing the profit of unit goods, so that businesses can gain more profits. For flexible goods, price reduction can increase the total revenue, but when the goods are lack of flexibility, price reduction will reduce the total revenue. In this paper, according to the sales data provided by a supermarket, we preprocess the data, establish appropriate indicators to measure the daily discount strength of the mall, and establish a mathematical model between the discount strength, sales and profit margin. Through these models, we found that meager profits do bring up sales, but too low discounts can also hurt total profits. In addition, when shopping malls implement discount promotions, they will also bring some negative effects, and we give some suggestions for this.

全社会物流成本的影响因素及下降空间测算

为了给有效降低全社会物流成本提供理论支持,支撑政府精准施策,首先,在深入剖析物流成本核算方法和衡量指标的基础上,系统分析了产业结构、产品价值、供需分布、流通速率、运输效能等因素的影响作用和影响趋势。然后,针对社会物流总费用与国内生产总值(GDP)的比率这一衡量指标,基于关联产业占比、工业增加值率、平均运距、存货周转天数、公路货物周转量占比5个关键参数建立了回归预测模型,对2024—2030年各影响因素贡献度开展预测分析。结果显示:2030年物流总费用与GDP的比率将降至12.36%;2024—2030年,关联产业占比贡献度将从20.9%波动降低至-0.48%;工业增加值率贡献度将从47.91%持续上升至78.39%;存货周转天数贡献度将从9.86%小幅上升至11.17%左右;平均运距贡献度将从33.49%持续下降至7.59%;公路货物周转量占比贡献度将从-12.15%稳定上升至3.33%。最后,基于测算成果,针对交通物流领域的降本工作提出推动交通物流融入现代化产业体系、推进新质生产力赋能、优化交通基础设施及重大生产力布局、引领构建现代流通体系、优化调整运输结构和促进多式联运发展等建议,为我国交通物流业的持续健康发展提供支撑。

新能源消纳与用户侧响应主从博弈的配电网智能软开关选址策略

分布式电源接入配电网后,配电网调控能力不足导致新能源消纳水平低、用户支出经济性指标差,提出一种新能源就地消纳和用户支出主从博弈的配电网智能软开关选址策略的嵌套模型和方法。外层建立以新能源渗透率最大、电能质量指标最佳且计及传统调控手段的模型结构;内层考虑新能源用户消纳的分时电价、储能装置充放电成本和日运行费用因素,构建能满足用户支出成本最低的需求响应模型。调用CPLEX求解器求解混合整数非线性规划模型,用户侧与配电网侧模型通过反复博弈优化决策变量,主从博弈内层优化采用改进粒子群优化算法加快收敛速度。以改进的IEEE 33节点系统为算例进行分析,验证了所提智能软开关选址策略的有效性。

Fuzzy Inventory Model with Variable Production and Selling Price Dependent Demand under Inflation for Deteriorating Items

The main purpose of this paper is to develop an inventory model under fuzzy approach by considering the effect of inflation and time value of money, to determine the optimal time period for inventory cycle and minimum total average costs. The model is integrated production inventory model developed where;the Demand has a direct linear impact on production rate. The model can be divided into four stages. In the first two stages with original production rate and subsequent change in production rate, inventory level rises. Third stage is time after the accumulation of inventory and before the deterioration starts, where demand which selling price dependent is depreciating the inventory level, while in the fourth stage deterioration occurs, which is considered to follow two parameter Weibull distribution. The back-order is not considered. Hexagonal fuzzy numbers are used to derive optimum solution and defuzzification by graded mean integration representation method. A numerical example is given to demonstrate the applicability of the purposed model and sensitivity analysis is carried out to reveal the impact of change in parameter values.

云储能模式下分布式用户虚拟储能需求评估

采用分布式储能技术可以改变能量的时空分布,提高配电网消纳分布式能源的灵活性。传统储能模式下储能成本过高、储能资源利用率低,而云储能是一种能够响应分布式储能需求的新型商业模式。文章考虑负荷、可再生能源出力、分时电价以及虚拟储能价格等影响用户虚拟储能需求的因素,建立了云储能模式下分布式用户虚拟储能需求配置优化模型。为验证该模型的有效性,选取社区内14个典型用户为分析对象。算例分析表明,与传统储能模式相比,云储能模式下用户的虚拟储能容量及功率需求分别降低了18.2%和7.1%,年化成本降低了4.12%,储能资源利用率提升了8.12%。因此,云储能模式具有很好的应用前景。

考虑故障率和修复次数的装备可修部件需求预计方法

针对装备可修部件的消耗预测粗放、困难、不准确,考虑可修部件故障率回退概率和修复次数约束限制,运用可靠性分析及随机过程理论,构建可修部件需求数量预计方法,通过算例分析说明,该预计方法比不考虑部件故障率回退的装备可修部件需求预计方法更为科学合理,证明了该预计方法的科学性和有效性,能够为保障部门确定合理的可修部件筹措、配置和供应数量提供参考。

养老机构入住率的多元供求驱动机制研究——基于NCA和fsQCA的双重分析

入住率是反映养老机构服务品质、养老服务资源利用效率的重要指标。运用必要条件分析方法和模糊集定性比较分析方法,探究重庆市38个区县养老机构入住率形成的多元供求驱动机制,结果显示:在入住率普遍偏低的背景下,不同地区养老机构入住率的形成机制不同,可将其归纳为以失能老人为核心的机构养老服务需求与综合照料服务供给协同形成的“传统型”高配供求驱动机制,以及以高水平养老资本为保障的机构养老服务需求与高水平医疗保健服务供给协同形成的“医养型”高配供求驱动机制,且后者更有可能产生高入住率。基于此,建议提高机构人员配比,逐步提升养老机构医养融合服务的供给能力,增强老年人的机构养老意愿,以及提升其机构养老服务购买能力。

考虑供需匹配特性的冷热电联供系统运行策略研究

针对以电定热和以热定电运行策略能量冗余以及混合热电运行策略能源不足的特性,在热电负荷平衡运行策略的基础上,提出了改进的热电负荷平衡运行策略。以北方某酒店为研究对象,并以最大化能源利用率为目标对系统的装机容量进行了优化,同时提出了能源综合指数,研究了在5种运行策略下购买能量和冗余能量对系统性能的影响。然后分析了在不同运行策略下系统的供需匹配特性和改进的热电负荷平衡策略下系统的能量平衡关系。最后,通过算例探究了改进的热电负荷平衡策略对提高系统经济性的作用,并经过对比分析验证了研究的合理性与有效性。研究结果表明,与其他4种运行策略相比,改进的热电负荷平衡运行策略下系统的能源利用率分别提高了4.3%、4.38%、4.75%、4.73%;能源综合指数分别降低了6.58%、5.96%、2.23%、3.45%;系统的年总成本分别降低了11.65%、2.74%、1.64%、0.74%。其中,改进的热电负荷平衡策略下系统的供需匹配性能最优(为0.9382)。

海拔对生活污水处理厂生化池曝气量影响探讨

我国地域广阔,平均海拔跨度大,海拔越高氧气越稀薄、气压越低,对污水处理厂标准传氧速率和曝气量具有明显影响。本文结合相关工程实例,对0、500、1000、1500、2000、2500、3000、3500、4000、4500、5000 m海拔下生化池实际需氧量、标准传氧速率和曝气量相关参数进行计算和校核。结果表明,考虑氧分压修正工况下曝气量与未考虑修正工况下差值随着海拔增加逐渐增大;实际需氧量不受海拔影响;标准传氧速率、供气量与海拔呈现一定指数关系,高海拔地区标准传氧速率和曝气量成倍增长,与平原地区差距显著。该研究结果也可为相关高原地区生化池曝气量的计算和设备选型提供参考。

中国纺织外贸企业面临的多重冲击及应对策略

随着近年来国际贸易环境的变化和国际市场竞争的加剧,中国纺织外贸企业面临诸多困境和挑战,如原料成本增大、汇率波动起伏、国际船运紧张、市场需求不稳定等。但各种稳外贸措施的出台、对东盟及“一带一路”沿线各国进出口贸易的持续增长、海外仓及多式联运货运方式的发展也给中国纺织外贸企业带来新机遇。鉴于此,政府应加强对纺织行业的规范管理,建立解决贸易壁垒的专门机构,中国纺织外贸企业要建数字外贸平台、树品牌形象、开拓多元市场、利用好海外营商环境等,多措并举,才能转危为机,更好地在全球纺织行业站稳脚跟。

建筑废水生化处理工艺与应用技术创新研究

为了提升建筑废水净化处理效果,考察了聚合氯化铝(PAC)、聚丙烯酰胺(PAM)投加量,pH值和预曝气对不同建筑废水样本进行处理的效果,对比分析了悬浮物(SS)、生化需氧量(COD)、浊度去除率的变化。结果表明,在PAC投加量为1200 mg时,COD、SS、NTU去除率取得最大值。在PAM投加量为20 mg时,COD、NTU去除率取得最大值;在PAM投加量为15 mg时,SS去除率取得最大值。在pH值为5时,COD、NTU去除率取得最大值;在pH值为7时,SS去除率取得最大值。经过预曝气30 min处理后,建筑废水的COD、SS、浊度去除率都较未经过预曝气样品有所上升。

科研建筑电力负荷密度研究

通过对中国科学院科研院所集中的北京市中关村和奥运村区域内数十家单位的电力负荷进行深入调查研究,结合有关单位运行维护的电力监测平台数据,通过数据统计、处理和分析,设计流程复盘、设计参数验算等方法,辅以科研院所实地走访等手段,从建设单位和设计单位共同关注的科研建筑“怎么算负荷,装机装多大”入手,针对科研建筑电力负荷密度的合理取值作出探索。

装备维修中备件需求率的预计方法

通过研究装备维修过程中器件的固有可靠性和维修性,着重分析了影响维修器件需求率的主要因素.利用系统建模和仿真的方法,分别针对耗损类型器件和可修复类型器件建立了相应的需求数学模型,最后给出了维修备件需求率的预计方法.