• The Journal of Information Technology
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• v.3 no.3
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• pp.103-115
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• 2000

The cost of logistics has been highlighted in Korea due to the fact that it has been an obstacle for nation's economic competitiveness. There are a number of logistics information service companies relating to international logistics. The absence of an integration of these VAN services leads to occurring the additional time and cost of operating which the users have to pay for This directly affects the competitiveness of our economy, This study presents the importance of information integration between the VAN service companies. In addition, the schemes for the standardization and connectivity of these services are suggested. This paper analyses the current status of international logistics and suggests the improvement and betterment of the integration.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.04a
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• pp.15-18
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• 2009

지능형 휠체어 구현에 있어 초음파 센서의 배열은 전동휠체어가 장애물을 감지할 수 있는 능력을 결정한다. 따라서 본 논문에서는 지능형 휠체어의 장애물 감지를 위한 초음파 센서의 효과적인 배열 방법을 제안한다. 초음파 센서 모듈은 총 10개의 4개 세트로 구성되어 있다. 전동 휠체어의 전방, 좌, 우측에는 각각 3개의 센서를 48도씩 중첩되게 겹쳐 하나의 세트로 구성하고, 후방에는 하나의 센서를 구성한다. 지능형 휠체어는 사용자 인터페이스, 장애물 회피 모듈, 모터 제어 모듈, 초음파 센서 모듈로 구성된다. 사용자 인터페이스는 정해진 명령을 하달 받고, 모터 제어 모듈은 하달된 명령과 센서들에 의해 반환된 장애물과의 거리 정보로 모터제어보드에 연결되어 있는 두 개의 좌우 모터들을 조종한다. 센서 모듈은 전동휠체어가 움직이는 동안에 주기적으로 센서들로부터 거리 값을 반환 받아 벽 또는 장애물을 감지하여 장애물의 위치를 사용자 인터페이스를 통해서 알려 주고, 또한 장애물 회피 모듈에 의해 장애물을 우회 하도록 움직인다. 제안된 방법의 센서 배열은 실험을 통해 지능형 휠체어가 임의로 설치된 장애물을 효과적으로 감지하고 보다 정확하게 장애물을 회피 할 수 있음을 보였다.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.423-426
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• 2006

The present situation where the hearing handicapped can never get any information from IT related devices in his place of work and house, the development of the wireless device for communicating with the hearing handicapped can be regarded as the very important research which can solve the problem of the new obstacle in unbalanced information. In this paper, we propose the multipurpose wireless communication device using information and communication technology, for coping with quickly a state of emergency and assisting the normal life of the hearing handicapped.

• Journal of The Institute of Information and Telecommunication Facilities Engineering
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• v.3 no.1
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• pp.15-24
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• 2004

'The delay and control overhead during route discovery for destinations outside ad hoc networks are major obstacle to achieving scalability in the Internet. To solve this issue, we propose a novel route discovery scheme equipped with two augmented functions. In this paper, the Internet gateway maintains an address cache of Internet nodes frequently accessed from the ad hoc network and replies with an extended Route Response (RREP) message to the Route Request (RREQ) message based on its routing table and the address cache called EXIT(EXternal node Information Table). These augmented functions make the source node determine the location of the destination as fast as possible. Through simulations, the proposed route discovery scheme using both EXIT and extended RREP message shows considerable' reduction in both route discovery time and control message overhead.

• Journal of Korean Library and Information Science Society
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• v.39 no.1
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• pp.431-463
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• 2008

Scholarly journal is the important media of the scholarly communication and the representative noncommercial works which aim the openness and the share of the scholarly information. Recently the concern about the open access movement of the scholarly journal is increasing in Korea. However, the copyright issues are becoming the big obstacle of the open access and the archiving of the scholarly journal paper. This study investigated the copyright dispute examples of the scholarly journal paper and analyzed the present conditions on the copyright possession of 906 scholarly journals registered in Korean Research Foundation. On the basis of the result, the paper proposed the concrete copyright plan for the open access and the archiving of the scholarly journal paper in Korea.

• Journal of Communications and Networks
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• v.9 no.1
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• pp.56-66
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• 2007

Mobile ad-hoc networks (MANETs) have attracted great research interest in recent years. Among many issues, lack of motivation for participating nodes to collaborate forms a major obstacle to the adoption of MANETs. Many contemporary collaboration enforcement techniques employ reputation mechanisms for nodes to avoid and penalize malicious participants. Reputation information is propagated among participants and updated based on complicated trust relationships to thwart false accusation of benign nodes. The aforementioned strategy suffers from low scalability and is likely to be exploited by adversaries. In this paper, we propose a novel approach to address these problems. With the proposed technique, no reputation information is propagated in the network and malicious nodes cannot cause false penalty to benign hosts. Nodes classify their one-hop neighbors through direct observation and misbehaving nodes are penalized within their localities. Data packets are dynamically rerouted to circumvent selfish nodes. As a result, overall network performance is greatly enhanced. This approach significantly simplifies the collaboration enforcement process, incurs low overhead, and is robust against various malicious behaviors. Simulation results based on different system configurations indicate that the proposed technique can significantly improve network performance with very low communication cost.

• Korean Management Science Review
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• v.12 no.3
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• pp.17-44
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• 1995

The changing business environment requires that firms reengineer their fundamental processes in order to retain their competitive advantage. Most Business Proess Reengineering (BPR) projects, however, have failed partly because the essential enabler, ie. information technology, was unable to perpetuate the original vision. The information systems were unable to support the collaboration among the workers participating in the process. Workflow Management Systems (WfMS) have the potential to enhance not only individual performance as did traditional information systems, but also the group performance essential to the success of BPR by providing an effective means of communications through connectivity. It also enhances productivitiy through proceduralization of the fundamental processes, thus making it possible to empower the employee even while it controls the flow, and ultimately the delaly that originally made the BPR effort necessary. Therefore, though it is not a panacea, WfMS's can improve chances for the success of BPR projects. Managers who have realized this are faced with another obstacle - that of selecting the WfMS that best meets the particular organization's needs. This paper provids an evaluation structure of WfMS functions with emphasis on those functions that are essential for BPR, classifying the functions into an attribute hierarchy according to the Analytic Hierarchy Process (AHP) approach. It also suggests specific evaluation criteria for the main workflow functions provided by most vendors today, thus providing managers with a comprehensive guideline to facilitate the decision process.

• Transactions of the Society of Information Storage Systems
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• v.2 no.4
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• pp.251-256
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• 2006

There is a great demand of micro-actuators for mobile information devices such as SFF optical drives and mobile phone cameras. However, the magnetic coils used in conventional electromagnetic motors are a major obstacle for the miniaturization because of their complicated structures and large power consumption. In this paper, a linear ultrasonic motor to actuate focusing lens of mobile devices is proposed. The new actuator uses a ring type bimorph piezoelectric material, and $d_{31}$ mode is adopted for applying linear motion. The interaction between inertia force and friction force makes linear motion by high-frequency saw signal input. The saw signal gives steady forces on the one direction by asymmetric inclination property of the signal itself on time domain. A commercial FEM(ANSYS) was used in this investigation for simulating structural analysis, identification of dynamic property, such as resultant displacement and coupled analysis with piezoelectric material. To evaluate the performance of the new design, a prototype was manufactured and experiments were carried out. Experimental results show the actuator motion of 5.4 mm/s at 10V saw signal of 41 kHz.

• Journal of the Korean Institute of Intelligent Systems
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• v.15 no.3
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• pp.330-336
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• 2005

Existing Bayesian update method using ultrasonic sensors only for mobile robot map building has a problem of the quality of map being degraded in the wall with irregularity, which is caused by the wide beam distribution. For improving this problem, an infrared sensors aided map building method is presented in this paper. Information of obstacle at each region in ultrasonic sensor beam is acquired using the infrared sensors and the information is used to get the confidence of ultrasonic sensor information via fuzzy inference system and genetic algorithm. Combining the resulting confidence with the result of Bayesian update method, an improve map is constructed. The proposed method showed good results in the simulations and experiments.

• Journal of Korea Society of Digital Industry and Information Management
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• v.10 no.1
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• pp.73-79
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• 2014

In this study, the unmanned vehicle to develop a preliminary step, we were facilities for Automated Guided Vehicle (AGV) simulator is designed and implemented. Industry is increasingly the more advanced automation and management systems need to be efficient. These studies are at least 24-hour continuous unmanned vehicles and personnel can result in reduction of labor costs. In addition, safety accidents can be minimized in the industry as an effect of intelligent AGV is essential. This study is the initial step for the development of AGV. manufactured simulator to Simulation and drives the performance of the system is evaluated. The configuration of the simulator, ultrasonic sensors, infrared sensors, and using the obstacle were to follow a given path. In addition, two-way communication between the host computer and the main processor that was. communication method that IEE802.11 meets the standard is applied to high-speed wireless LAN systems, each of the sensor information is calculated. AGV having a drive shaft 4 of the four wheels are respectively independent structure. AGV's main processor is driven using a high-performance DSP, and the controller controls the steering device of the load could be significantly reduced.