• Journal of Korean Institute of Industrial Engineers
• /
• v.22 no.3
• /
• pp.313-324
• /
• 1996

A new policy to determine the waiting position of an idle Automated Guided Vehicle(AGV) is proposed and its performance is compared with the existing waiting position policies. Unlike the existing policies, the queue length in the input buffer is considered in the new policy. As a result, the waiting position based on the new policy depends on the status of the system. The simulation result indicates that the proposed policy reduces the waiting time in both the input and the output buffers significantly, regardless of the number of AGVs in the system. Therefore, the manufacturing lead time can be minimized.

• Journal of the Korea Society of Computer and Information
• /
• v.8 no.2
• /
• pp.1-7
• /
• 2003

This study is a research on character recognition based on image processing, using only color tape to mark guidelines instead of magnetic tape or electric wire used by existing AGV. AGV must follow given courses, and stop recognizing signs such as marks and numbers that indicate destinations. In this study. marks to stop AGV employed blue characters of the same font and size as those of number plates. Yellow driving lines and blue numeric characters were marked in corridors. AGV ran ing the characteristics of colors and detecting lines, and temporarily stopped recognizing numbers of 100％ through DP pattern matching. This study presented the image processing technique and the result of operating AGV.

• Journal of Digital Convergence
• /
• v.15 no.5
• /
• pp.207-215
• /
• 2017

With rapid development of IT technology and biotechnology, human lifespan is extended rapidly, and we are living in the era where aging becomes the social issue. Due to this aging problem, manpower is mainly replaced by Automated Guided Vehicles (AGV) in manufacturing factories or warehouse logistics transportation. Rate of AGV use increases sharply every year. AGVs, which were used only in Smart Factories, extends its usage into indoor and outdoor operation by changing their usages to container transportation that can carry huge containers in the harbor. With the expansion of AGVs usage, the importance of RCS (Remote Control System) is also increased. In this study, we surveyed and analyzed the characteristics and technology trends of technical features of AGV's RCS that are developing in various ways to establish quality evaluation system of AGV RCS. Based on this, and by referring to international quality assessment standards, ISO/IEC 25000 series, we derived evaluation items on functional suitability and usability to secure reliability of AGV RCS. Also, it is our intention to develop evaluation model using those derived usability and reliability evaluation items.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2000.11a
• /
• pp.177-184
• /
• 2000

This study is to choose the most proper model for AGV throughout simulation of behavior of suspension to reduce trial and error because there is no AGV treating heavy weight at harbor loading and unloading at home. Therefore, we estimate the vibration modes of the various suspensions applied to AGV, which is over 75 ton included the weight of two containers using the Matlab in the case of G and 5G, one of the simulation programs.

• Management Science and Financial Engineering
• /
• v.5 no.1
• /
• pp.1-25
• /
• 1999

There is a worldwide trend to automate the handling operations in port container terminals in an effort to improve productivity and reduce labor cost. This study iscusses how to apply an AGV(automated guided vehicle) system to the handling of containers in the yard of a port container ter-minal. The main issue of this paper is how to assign tasks of container delivery to AGVs during ship operations in an automated port container terminal. A dual-cycle operation is assumed in which the loading and the discharging operation can be performed alternately. Mixed integer linear program-ming formulations are suggested for the dispatching problem. The completion time of all the dis-charging and loading operations by a quayside crane is minimized, and the minimization of the total travel time of AGVs is also considered as a secondary objective. A heuristic method using useful properties of the dispatching problem is suggested to reduce the computational time. The perfor-mance of the heuristic algorithm is evaluated in light of solution quality and computation time.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 1999.10a
• /
• pp.315-320
• /
• 1999

Obstacle Detection System(ODS) is a essential system for automated vehicle, such as AGV(Automatic Guided Vehicle), mobile robot. Automated vehicle must have a capability to detect and to avoid obstacles to guarantee a safe driving condition. To implement obstacle detection system, virtual bumper concept adapted. Like real bumper in a car, such as in the truck, it protects vehicle from collision using laser distance sensor. When an obstacle(such as other vehicle, building, etc) intrudes this virtual bumper area, a virtual force is calculated and produces necessary strategy to be able to avoid collision. In this paper, simplified virtual bumper concept is presented, and various problems when happens to implement are discussed.

• The Journal of Korea Robotics Society
• /
• v.5 no.4
• /
• pp.332-338
• /
• 2010

This paper presents a study of path-planning method for AGV(automated guided vehicle) based on path-tracking. It is important to find an optimized path among the AGV techniques. This is due to the fact that the AGV is conditioned to follow the predetermined path. Consequently, the path-planning method is implemented directly affects the whole AGV operation in terms of its performance efficiency. In many existing methods are used optimization algorithms to find optimized path. However, such methods are often prone with problems in handling the issue of inefficiency that exists in system's operation due to inherent undue time delay created by heavy load of complex computation. To solve such problems, we offer path-planning method using modified binary tree. For the purpose of our experiment, we initially designed a AGV that is equiped with laser navigation, two encoders, a gyro sensor that is meant to be operated within actual environment with given set of constrictions and layout for the AGV testing. The result of our study reflects the fact that within such environments, the proposed method showed improvement in its efficiency in finding optimized path.

• Proceedings of the Korea Inteligent Information System Society Conference
• /
• 2005.05a
• /
• pp.103-112
• /
• 2005

자동화 컨테이너 터미널의 생산성을 향상시키기 위해서는 장치장과 안벽 사이를 오가며 컨테이너를 운반하는 무인유도 차량(Automated Guided Vehicle: AGV)들이 효율적으로 주행하여 제 시간에 필요한 위치에 도착함으로써 연계 작업들의 지연을 최소화하여야 한다, 만일 AGV들이 목적지까지 주행하여야 하는 거리가 길거나 주행 중에 다른 AGV들과의 충돌이나 교축을 피하기 위하여 대기하여야 하는 상황이 빈번히 발생하면 주행 효율이 떨어지게 된다, 주행 경로의 길이를 줄이기 위하여 경로들을 보다 유연하게 설정할 수 있게 허용하면 경로들간의 교차 가능성이 높아져 교통 통제가 어려워지고 결과적으로 충돌과 교착이 발생할 가능성은 높아진다. 특히 교착을 사전에 방지하기 위하서는 문제가 발생할 소지가 있는 영역을 미리 파악하여 일부 영역을 다른 AGV들이 점유하지 못하도록 제한하여야 하는데, 이는 자칫 AGV 주행 공간의 활용도를 떨어뜨릴 수 있다. 또한 교착의 파악과 이를 방지하기 위한 제어는 실시간에 이루어져야 하므로 연산 부담이 상당하다. 본 논문에서는 유연한 주행 경로 설정이 가능하며 주행 공간을 효율적으로 활용할 수 있는 주행 경로 표현법과 충돌 방지 방안을 제안한다. 또한 교착 발생 가능성을 사전에 파악하고 회피(avoidance)하는데 소요되는 연산비용을 줄여 실시간 적용 가능성을 높이기 위하여 교착해결(deadlock resolution)에 기반을 둔 AGV 주행 관리 방안을 제시한다. 본 논문에서 제안하는 방안의 효율성을 시뮬레이션을 통하여 검증해 보았다.

• Proceedings of the Korea Association of Information Systems Conference
• /
• 1996.11a
• /
• pp.199-204
• /
• 1996

It is discussed how to determine the home location of idle vehicles in an AGVS with a loop guide path in a way of maximizing the request-call response probabilities for all demand. Optimal home position is selected by solving the simultaneous equations easily. Static positioning strategy is analyzed in which a single home position is allocated to which every vehicle is routed whenever it becomes idle. The cases of unidirectional guidepath is considered only. We provide a numerical example to illustrate the search algorithm developed for the case and compare the searched optimal solutions with the others.

• 제어로봇시스템학회:학술대회논문집
• /
• 1991.10a
• /
• pp.793-798
• /
• 1991

Implementation of AGVS (Automated Guided Vehicle System) in CIMS (Computer Integrated Manufacturing System) generally requires substantial study to optimize design and performance of the guide path. Traditional mathematical approaches have been used with limited success to analyze AGVS. These approaches, however, do not provide a practical opportunity to use by path designers. This paper presents a new approach based on Jules in designing and assessing AGV path to have better design of the closed-loop layout. A framework for the approach is proposed and a case study is reported to demonstrate the framework. Deletion of seldom used paths and addition of bypasses to solve the congestion problem are conducted automatically through simulation expefiments. To visualize die results a graphic control program is developed and integrated with AutoMod/AutoGram simulation package.