• 한국컴퓨터정보학회논문지
• /
• 제24권1호
• /
• pp.167-178
• /
• 2019

In this paper, we study the multi-objectives vehicle and drone routing problem with time windows, MOVDRPTW for short, which is defined in an urban delivery network. We consider the dual modal delivery system consisting of drones and vehicles. Drones are used as a complement to the vehicle and operate in a point to point manner between the depot and the customer. Customers make various requests. They prefer to receive delivery services within the predetermined time range and some customers require fast delivery. The purpose of this paper is to investigate the effectiveness of the delivery strategy of using drones and vehicles together with a multi-objective measures. As experiment datasets, we use the instances generated based on actual courier delivery data. We propose a hybrid multi-objective evolutionary algorithm for solving MOVDRPTW. Our results confirm that the vehicle-drone mixed strategy has 30% cost advantage over vehicle only strategy.

• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.237-241
• /
• 2009

Automation and robotic technology (ART) has been successfully applied in the manufacturing and allied industries to achieve on-time delivery of quality products at increasingly reduced costs. Meeting time, quality and cost targets still remains a big challenge in the global construction industry with prevalence of time and cost overruns. Application of ART in the construction industry could contribute to significant improvement in the efficient and effective delivery of projects to meet and exceed client expectations. However, the uptake of ART is still low in the construction industry. This study investigates the various ways in which ART could be applied to improve construction project delivery, potential areas of applications, and constraints to the uptake of the technology in the construction industry. Recommendations are made for improving the uptake of ART in the construction industry.

• Advances in aircraft and spacecraft science
• /
• 제10권5호
• /
• pp.393-418
• /
• 2023

Drones are increasingly used in logistics delivery due to their low cost, high-speed and straight-line flight. Considering the small cargo capacity, limited endurance and other factors, this paper optimized the pickup and delivery vehicle routing problem with time windows in the mode of "truck+drone". A mixed integer programming model with the objective of minimizing transportation cost was proposed and an improved adaptive large neighborhood search algorithm is designed to solve the problem. In this algorithm, the performance of the algorithm is improved by designing various efficient destroy operators and repair operators based on the characteristics of the model and introducing a simulated annealing strategy to avoid falling into local optimum solutions. The effectiveness of the model and the algorithm is verified through the numerical experiments, and the impact of the "truck+drone" on the route cost is analyzed, the result of this study provides a decision basis for the route planning of "truck+drone" mode delivery.

• 방송공학회논문지
• /
• 제24권7호
• /
• pp.1259-1265
• /
• 2019

Maintaining timing relationships among packets in a single media stream or between packets from different media streams is an essential criterion in MMT system. It is the function of the synchronization and de-jittering algorithms to re-adjust timing relationship between the MMT packets to assure synchronized playback. Thus, delivery of time constrained MPEG media on time, according to their temporal requirements, is an important goal of MMT. For this purpose MMT needs to specify syntax and semantics of a timing model to be used by the delivery functions. In this paper, we propose a proper timestamp-related header format for MMT delivery timing model to support media synchronization in various delivery scenarios including hybrid delivery.

• Journal of Acupuncture Research
• /
• 제20권5호
• /
• pp.82-92
• /
• 2003

Objective: To appreciate the effect of San-Yin-Jiao(SP-6) pressure on duratof delivery time and quantity of blood loss in order to verify the possibility of application to clinic of San-Yin-Jiao pressure. Methods: The design of this study is nonequivalent control group non- synchronized design. The subjects are 39 persons who are made up of SP-6 pressure applied(experimental) group 20 persons and to control group 19 persons. Collected data were analyzed as frequency, percentage, t-test, $x^2-test$ using SPSS 10.0 WIN Program. Conclusions: San-Yin-Jiao(SP-6) pressure not only make short duration of delivery time, but also decline quantity of blood loss in effect. 1. It could be necessary that the study of the effects of San-Yin-Jio(SP-6) pressure on duration of delivery time and quantity of blood loss for primipara be done repeatedly. 2. It could be necessary to increase this sort of study through free random experimental design in order to generalize this experimental result.

• 한국군사과학기술학회지
• /
• 제25권4호
• /
• pp.425-433
• /
• 2022

This paper studies the method of delivering munitions using both drones and UGVs that are developing along with the 4th Industrial Revolution. While drones are more mobile than UGVs, their loading capacity is small, and UGVs have relatively less mobility than drones, but their loading capacity is better. Therefore, by simultaneously operating these two delivery means, each other's shortcomings may be compensated. In addition, on actual battlefields, time constraints are an important factor in delivering munitions. Therefore, assuming an actual battlefield environment with a time limit, we establish delivery routes that minimize delivery time by operating both drones and UGVs with different capacities and speeds. If the delivery is not completed within the time limit, penalties are imposed. We devised the hybrid genetic algorithm to find solutions to the proposed model, and as results of the experiment, we showed the algorithm we presented solved the actual size problems in a short time.

• 무역상무연구
• /
• 제77권
• /
• pp.1-22
• /
• 2018

Under CISG the places of delivery by the seller of the goods are: If the seller is not bound to deliver the goods at any other particular place and the contract of sale involves carriage of the goods, the seller has to hand the goods over to the first carrier for transmission to the buyer. However, if the contract does not involve carriage of the goods, he has to place them at the buyer's disposal at the place where, at the time of the conclusion of the contract, both the seller and the buyer knew that the goods were at, or were to be manufactured or produced. This rule applies when the contract relates to specific goods, or unidentified goods to be drawn from a specific stock or to be manufactured or produced. Finally, in ant other cases the seller has to place the goods at the buyer's disposal at the place where the seller had his place of business at the time of the conclusion of the contract. As to time of delivery, if a date is fixed by or determinable from the contract, the seller has to deliver the goods on that date. If a period for delivery is fixed by or determinable from the contract, he has to deliver the goods on any date within that period. In this way the seller chooses the specific date of delivery within that period, while circumstances indicate otherwise that the choice is to be made by the buyer. There no such date or period, the seller has to deliver the goods within a reasonable time after the conclusion of the contract. If the seller delivers the goods before such the date or period, the buyer is entitled to take delivery or refuse to take delivery. Under these backgrounds of provisions of CISG, this study first suggests the concepts of the handing over of the goods by the seller to the carrier and the placing them at the buyer's disposal. Then it goes further to looks into exactly where and when the delivery has to occur. In these context, this study more examines what happens if there is a breach of contract by the seller in connection with the delivery. That is, if the seller delivers non-conforming goods or at wrong place; what if there is a partial delivery or a premature delivery.

• 한국축산시설환경학회지
• /
• 제6권1호
• /
• pp.15-22
• /
• 2000

A monitoring and the forecasting system for the swine delivery was developed using CCD camera multi-function board microphone and data-recorder equipped on a personal computer. For the swine delivery monitoring and forecasting factors four factors were selected such as genitalia swine body shape breast color and sound. Image of physical variation of body shape, shape and color of genitalia area and color of breast of pregnant sow were grabbed using the CCD color camera and multi-function board and variation of voice of pregnant sow was acquired using microphone and data recorder. Acquired information of image and voice were analyzed using a custom developed algorithm and program. The result of the forecasting efficiency of swine delivery was 89%, 71% and 100% using the variation of genitalia are the body shape and the voice of pregnant sow. respectively. The efficiency of image processing was 100% for the delivery detection when the piglet was delivered half of its body from genitalia of pregnant sow, The monitoring and forecasting system informed the estimated time of the delivery of swine to a farm manager immediately if an estimated and established time set by the farm manager was the same and/or the estimated time ws earlier than the established time and the system detected the delivery.

• 한국시스템다이내믹스연구
• /
• 제9권1호
• /
• pp.199-218
• /
• 2008

Empirical studies have shown that government and human service nonprofit organizations have maintained active partnerships to deliver human services for the past several decades. However, the previous researches on resource dependent government-nonprofit service delivery have revealed serious methodological limitations to adequately demonstrate the dynamic relationship between both sectors over time. Since the dynamics underlying the government-nonprofit service delivery is a complex process, in which multiple factors dynamically interact over time, the assumptions of system dynamics can help improve these methodological drawbacks. This study aims to explore methodological issues and weaknesses observed in empirical studies on resource dependent government-nonprofit service delivery in the United States, and further attempts to provide insights on future research toward a dynamic approach, bringing the assumptions of system dynamics to the challenges of the previous researches.

• 한국경영과학회지
• /
• 제26권4호
• /
• pp.143-153
• /
• 2001

In this study we develop a computer simulation model to evaluate the effects of various production and order processing policies measured in terms of on-time delivery rate and average waiting time of job orders. Policies considered include : eliminating inflated due date, lot splitting, loss time reduction, attaining full flexibility in production lines, and selective order promising scheme. Actual order-production data from a chemical company were used in the simulation model. Based on the simulation results, we make several suggestions that can significantly reduce the production lead time and increase the on-time delivery rate.