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| 1 | An Approximation of the Customer Waiting Time for Online Restaurants Owning Delivery System显示文摘Online restaurants, which receive online orders and deliver food directly to the customer’s residence, are becoming increasingly popular. To be successful, online restaurants need to provide reliable and prompt deliveries. Careful design of the meal preparation and order delivery systems is needed to avoid excessive cust omer waiting time bet ween ordering and delivery. This paper considers the meal preparation and delivery processes simultaneously to approximate average customer waiting time for deliveries. The authors first discuss the system performance with one cook and unit-capacity delivery vehicles, using an M/G/1queue and a GI/G/1queue. Numerical experiments show that our approximation can adequately describe real waiting times. Then, series queues with multiple cooks and multi-capacity delivery vehicles, e.g., an M/G/n queue and a GI/Gn/1 queue, are examined. Results show that except for situations with a large meal preparation time and a small vehicle capacity, compared with the result of simulation, the approximation in this paper is acceptable with a deviation of less than 20%. The marginal decrease in waiting time associated with hiring more vehicles is est.imated under different meal preparation speeds, sizes of service area and vehicle capacities. | ZHANG Tianhua ZHAO Fu ZHANG Juliang MENDIS Gamini RU Yihong SUTHERLADN John W | 2019 | Journal of Systems Science & Complexity2019，32，3： | 2 |
| 2 | Effects of Sericite Modified by Macromolecular Dispersant on the Thermal, Mechanical and Electrical Properties of the NR/SBR Composites显示文摘 | HU W Z RU X ZHANG Y C | 2011 | Journal of Macromolecular Science Part A-Pure and Applied Chemistry2011，48，11： | 1 |
| 3 | New Concepts and New Design of Permanent Maglev Rotary Ar-tificial Heart Blood Pumps显示文摘 | Qian K X Zeng P Ru W M | | 0，，04： | 1 |
| 4 | Carbon-nanotube-reinforced Zr- based bulk metallic glass composites and their properties显示文摘 | ZAN B RU J W WEI H W | 2004 | Ad- vanced Functional Materials2004，14，1： | 1 |
| 5 | Two host cytoplasmic effectors are required for pathogenesis of Phytophthora sojae by suppression of host c]efenses 显示文摘 | Liu T Ye W Ru Y | 2011 | Plant Physio12011，155，： | 1 |
| 6 | Study on Sta-ble Equilibrium of Levitated Impeller in Rotary Pump with Passive Magnetic Bearings显示文摘 | Qian K X Wan F K Ru W M | | 0，，02： | 1 |
| 7 | New concepts and new design of permanent maglev rotary artificial heart blood pumps 显示文摘 | Qian K X Zeng P Ru W M | 2006 | Medical Engineering & Physics2006，28，4： | 1 |
| 8 | Kinetic modeling of liquid- phase adsorption of reactive dyesand metallonson ehitosan显示文摘 | Feng C W Ru L T Juang R S | 2001 | Water Resource2001，35，3： | 1 |
| 9 | Excellent ultrasonic absorption abil- ity of carbon-nanotube-reinforced bulk metallic glass composites 显示文摘 | ZAN B RU J W DE Q Z | 2003 | Applied Physics Letters2003，82，17： | 1 |
| 10 | Enhanced password authenticationthrough fuzzy logic显示文摘 | De Ru W G Eloff J H P | 1997 | IEEE Expert1997，12，6： | 1 |
| 11 | Removal of phosphate from polluted water by lanthanum doped vesuvianite显示文摘 | I Li H Ru J Y Yin W | 2009 | Journal of Hazardous Materials2009，168，1： | 1 |
| 12 | 17 beta-estradiol (E2) induces cdc25A gene expression in breast cancer cells by genomic and non-genomic pathways显示文摘 | Ru Lee W Chen CC Liu S | 2006 | J Cell Biochem2006，99，1： | 1 |
| 13 | Removal of phosphate from polluted water by lanthanum doped vesuvianite显示文摘 | Li H Ru J Y Yin W | 2009 | Journal of Hazardous Materials2009，168，1： | 1 |
| 14 | Novelmagnetic spring and magnetic 显示文摘 | QIAN K X ZENG P RU W M | 2003 | IEEE Transactionson Magnetics2003，39，： | 1 |
| 15 | Congenital dys- erythropoietic anemia in a Chinese family with a muta- tion of the CDANl-gene显示文摘 | RU Y X ZHU X F YAN W W | 2008 | Ann Hematol2008，87，： | 1 |
| 16 | GABA-opiates interactions in the activity of analgesics显示文摘 | Zakusov W Ostrovskaya RU Bulayev VM | 1983 | Arch Int Pharmacodyn Ther1983，265，1： | 1 |
| 17 | Targeting Toll-like receptor (TLR) signaling by Toll/ interleukin-1 receptor ( TIR ) domain-containing adapter protein/MyD88 adapter-like (TIRAP/Mal)- derived decoy peptides 显示文摘 | COUTURE L A PIAO W RU L W | 2012 | J Biol Chem2012，287，24： | 1 |
| 18 | Relationships between vege- tation and climate on the Loess Plateau in China显示文摘 | Zhang J T Ru W M Li B | 2006 | Folia Geobotanica2006，41，2： | 1 |
| 19 | Removal of phosphate from polluted water by lanthanum doped vesuvianite 显示文摘 | Li H Ru J Y Yin W et ul | 2009 | Journal of Hazardous Materials2009，168，1： | 1 |
| 20 | Evaluation of acute and chronic bacterial pros tatitis and diagnostic management of chronic prostatitis/chronic pelvic pain syndrome with special reference to infection/inflammation显示文摘 | Weidner W Anderson RU | | 0，，1： | 1 |
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