Line configuration and balancing is to select the type of line and allot a given set of operations as well as machines to a sequence of workstations to realize high-efficiency production. Most of the current researche...Line configuration and balancing is to select the type of line and allot a given set of operations as well as machines to a sequence of workstations to realize high-efficiency production. Most of the current researches for machining line configuration and balancing problems are related to dedicated transfer lines with dedicated machine workstations. With growing trends towards great product variety and fluctuations in market demand, dedicated transfer lines are being replaced with flexible machining line composed of identical CNC machines. This paper deals with the line configuration and balancing problem for flexible machining lines. The objective is to assign operations to workstations and find the sequence of execution, specify the number of machines in each workstation while minimizing the line cycle time and total number of machines. This problem is subject to precedence, clustering, accessibility and capacity constraints among the features, operations, setups and workstations. The mathematical model and heuristic algorithm based on feature group strategy and polychromatic sets theory are presented to find an optimal solution. The feature group strategy and polychromatic sets theory are used to establish constraint model. A heuristic operations sequencing and assignment algorithm is given. An industrial case study is carried out, and multiple optimal solutions in different line configurations are obtained. The case studying results show that the solutions with shorter cycle time and higher line balancing rate demonstrate the feasibility and effectiveness of the proposed algorithm. This research proposes a heuristic line configuration and balancing algorithm based on feature group strategy and polychromatic sets theory which is able to provide better solutions while achieving an improvement in computing time.展开更多
目的:研究益气健脾汤治疗脾气亏虚型糖耐量减低(IGT)患者的疗效以及对血糖波动指数的影响。方法:纳入2023年12月—2024年2月在黑龙江中医药大学附属第三医院内分泌(老年病)科门诊、住院部的60例IGT(脾气亏虚型)患者,按照随机数字表法分...目的:研究益气健脾汤治疗脾气亏虚型糖耐量减低(IGT)患者的疗效以及对血糖波动指数的影响。方法:纳入2023年12月—2024年2月在黑龙江中医药大学附属第三医院内分泌(老年病)科门诊、住院部的60例IGT(脾气亏虚型)患者,按照随机数字表法分为对照组和治疗组,每组30例。两组患者均给予饮食、宣教、运动等一般基础治疗。对照组在基础治疗的基础上给予阿卡波糖胶囊;治疗组在对照组基础上加用益气健脾汤联合治疗。两组患者均治疗6周。观察两组在治疗前后的空腹血糖(FPG)、2 h血糖(2 h PG)、糖化血红蛋白(HbA1c);甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白(LDL);血糖变异系数(GLUCV)、血糖标准差(GLUsd)、平均血糖值(GLUmean)、日内平均血糖波动幅度(MAGE)、日间血糖平均绝对差(MODD)及中医证候评分,并观察其疗程结束时的随访转归情况。结果:治疗6周后,两组患者的糖代谢指标、GLUsd、GLUmean、GLUCV、MAGE、中医证候评分均显著降低(P<0.05),治疗组的糖代谢指标、GLUsd、GLUCV、MAGE、中医证候评分显著低于对照组,差异有统计学意义(P<0.05)。结论:益气健脾汤能有效改善IGT患者症状,调节糖代谢,并能缩小血糖波动,延缓2型糖尿病发生发展,比单纯生活方式干预和阿卡波糖治疗持久有效。展开更多
基金Supported by Shanghai Municipal Science and Technology Commission(Grant No.12JC1408700)National Science and Technology Major Project of the Ministry of Science and Technology of China(Grant Nos.2013ZX04012-071,2011ZX04015-022)
文摘Line configuration and balancing is to select the type of line and allot a given set of operations as well as machines to a sequence of workstations to realize high-efficiency production. Most of the current researches for machining line configuration and balancing problems are related to dedicated transfer lines with dedicated machine workstations. With growing trends towards great product variety and fluctuations in market demand, dedicated transfer lines are being replaced with flexible machining line composed of identical CNC machines. This paper deals with the line configuration and balancing problem for flexible machining lines. The objective is to assign operations to workstations and find the sequence of execution, specify the number of machines in each workstation while minimizing the line cycle time and total number of machines. This problem is subject to precedence, clustering, accessibility and capacity constraints among the features, operations, setups and workstations. The mathematical model and heuristic algorithm based on feature group strategy and polychromatic sets theory are presented to find an optimal solution. The feature group strategy and polychromatic sets theory are used to establish constraint model. A heuristic operations sequencing and assignment algorithm is given. An industrial case study is carried out, and multiple optimal solutions in different line configurations are obtained. The case studying results show that the solutions with shorter cycle time and higher line balancing rate demonstrate the feasibility and effectiveness of the proposed algorithm. This research proposes a heuristic line configuration and balancing algorithm based on feature group strategy and polychromatic sets theory which is able to provide better solutions while achieving an improvement in computing time.
文摘目的:研究益气健脾汤治疗脾气亏虚型糖耐量减低(IGT)患者的疗效以及对血糖波动指数的影响。方法:纳入2023年12月—2024年2月在黑龙江中医药大学附属第三医院内分泌(老年病)科门诊、住院部的60例IGT(脾气亏虚型)患者,按照随机数字表法分为对照组和治疗组,每组30例。两组患者均给予饮食、宣教、运动等一般基础治疗。对照组在基础治疗的基础上给予阿卡波糖胶囊;治疗组在对照组基础上加用益气健脾汤联合治疗。两组患者均治疗6周。观察两组在治疗前后的空腹血糖(FPG)、2 h血糖(2 h PG)、糖化血红蛋白(HbA1c);甘油三酯(TG)、总胆固醇(TC)、低密度脂蛋白(LDL);血糖变异系数(GLUCV)、血糖标准差(GLUsd)、平均血糖值(GLUmean)、日内平均血糖波动幅度(MAGE)、日间血糖平均绝对差(MODD)及中医证候评分,并观察其疗程结束时的随访转归情况。结果:治疗6周后,两组患者的糖代谢指标、GLUsd、GLUmean、GLUCV、MAGE、中医证候评分均显著降低(P<0.05),治疗组的糖代谢指标、GLUsd、GLUCV、MAGE、中医证候评分显著低于对照组,差异有统计学意义(P<0.05)。结论:益气健脾汤能有效改善IGT患者症状,调节糖代谢,并能缩小血糖波动,延缓2型糖尿病发生发展,比单纯生活方式干预和阿卡波糖治疗持久有效。
