• KSII Transactions on Internet and Information Systems (TIIS)
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• v.11 no.10
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• pp.4698-4716
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• 2017

Wireless signal transmission is influenced by environmental effects. These effects have also been challenging for Vehicular Ad hoc Network (VANET) in real-time communication. More specifically, in an urban environment, with high mobility among vehicles, a vehicle's status from the transmitter can instantly trigger from line of sight to non-line of sight, which may cause loss of real-time communication. In order to overcome this, a deterministic signal propagation model is required, which has less complexity and more feasibility of implementation. Hence, we propose a realistic path loss model which adopts ray tracing technique for VANET in a grid urban environment with less computational complexity. To evaluate the model, it is applied to a vehicular simulation scenario. The results obtained are compared with different path loss models in the same scenario based on path loss value and application layer performance analysis. The proposed path loss model provides higher loss value in dB compared to other models. Nevertheless, the performance of vehicle-vehicle communication, which is evaluated by the packet delivery ratio with different vehicle transmitter density verifies improvement in real-time vehicle-vehicle communication. In conclusion, we present a realistic path loss model that improves vehicle-vehicle wireless real-time communication in the grid urban environment.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.1021-1024
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• 2000

In this paper, a neuro-fuzzy system for quantitative characterization of chaotic signals is proposed. The proposed system is differ from the previous methods in that the nonlinear functions of the nonlinear dynamical systems are calculated as the invariant factor. In the proposed neuro-fuzzy system, the nonlinear functions are determined by supervised learning. From the reconstructed nonlinear functions, the proposed system can generate extrapolated chaotic signals. This feature will help the study of nonlinear dynamical systems which require large number of chaotic data. To confirm the validity of the proposed system, nonlinear functions are reconstructed from 1-dimensional and 2-dimensional chaotic signals.

• Proceedings of the IEEK Conference
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• 2000.07b
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• pp.1017-1020
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• 2000

In this paper, a CNN using 1-dimensional chaos circuits with controllable nonlinear functions is proposed. The proposed CNN consists of $\p{times}q$ chaos circuits which are called cell circuits. The nonlinear functions of the cell circuits can be controlled by employing fuzzy scheme. Thanks to the controllability of the nonlinear functions, the proposed circuit can adjust transition behavior of the CNN electronically. Furthermore, the chaotic behavior of the cell circuit which is a portion of the proposed CNN is simple since the cell circuit is a 1-dimensional chaos circuit. To confirm the validity of the circuit design, SPICE simulations were performed concerning the proposed CNN.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1015-1018
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• 2003

과거 우리는 플랫폼 독립적인 XML과 GUI 기반의 툴들을 제공하여 장비에 대한 제어 및 모니터링 소프트웨어의 효율적인 생성과 유지보수성을 향상하기 위한 프레임워크[1][2]를 제안하였다. 제안한 프레임워크는 세 가지의 XML 문서(IID, MAP, CMIHL), VI Wizard, Generator로 구성되었다. 본 논문에서는 제안한 프레임워크의 한 구성요소인 Generator에 대한 설계와 구현을 보인다. Generator는 장비의 제어정보 모니터링 정보, 통신 정보, 스케줄 정보, 제어 소프트웨어의 사용자 인터페이스 정보 등을 기술하는 CMIML(Control & Monitor ing Instrument Markup Language) 문서를 이용해서 GUI 기반의 사용자 인터페이스 편집 환경을 제공하고, CMIML 문서를 소프트웨어 코드로 변환함으로써 제어 및 모니터링 소프트웨어를 자동 생성한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.915-918
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• 2003

본 논문은 OPC 기반 장비의 제어 소프트웨어 생성 시스템(iMaker)의 중앙 집중식 제어 모델의 취약점(제어 컴퓨터의 오류시 모든 제어 중지)을 해결하고 성능 향상을 위하여 제어 소프트웨어를 구성하는 제어 로직들의 분산 배치 및 통합 방법을 사용하여 소기 목적을 달성하고자 한다. 우리가 제안하는 분산 배치 통합 모델은 제어 소프트웨어 실행 시에 발생할 수 있는 오류(시스템 에러, 네트웍 오류)를 극복하는 구조로 디자인하였기 때문에 PC 기반의 제어시스템에 대하여 안전성을 보장하는 방법을 제공한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.05a
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• pp.325-328
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• 2003

문장분석은 문장의 의미를 파악하기 위한 작업이다. 문장분석에는 문장 구성성분에 종합적인 정보를 필요로 한다. 문장분석을 위해서는 다양한 언어학적 도구와 자원이 필요하다. 가용 도구와 자원은 대부분 독립적으로 개발 축적된 것들이다. 이러한 도구와 자원을 이용하여 문장분석 정보들을 단계적으로 관리하고 처리하기에는 어려움이 있다. 이를 위해 본 논문에서는 문장분석용 통합 사용자 인터페이스 ISAAC를 개선하여 구문분석의 성공률과 그 정보의 상호보완성을 높이고자 하였다.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.932-935
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• 2004

In this paper, we present a framework that is easy to develop, modify, maintain and extend a control and monitoring software for any kinds of instruments. The presented framework is composed of three XML documents (IID, MAP, and CMIML) and two tools (Virtual Instrument Wizard, Generator). Interface information about behaviors and states of instruments is written on IID. Mapping information between the interface information in IID and API of a real instrument driver is written on MAP. Finally information about control and monitoring software is written on CMIML. IID, MAP and CMIML are written with XML format to provide common usage and platform independence of the suggested framework. VI Wizard generates CMIML (platform independent intermediate document) using IID and existing CMIML, and Generator generates source code of a control and monitoring software (platform dependent code) automatically using CMIML and MAP. The suggested framework that automatically generates control and monitoring software based on GUI provides easy development and maintenance. Also, reusability can be increased by reusing platform independent software description documents.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1996.06b
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• pp.128-133
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• 1996

In this paper, we describe the design and implementation of a multimedia information system integrating hypermdia, information retrieval, and DBMS technologies. We browse the information space through hypermedia link navigation and also use ad hoc queries for direct retrieval of information from the database. Both the hypermedia and the information retrieval systems are integrated into a database management system (DMBS) so that concurrent edition, update, and retrieval of documents can have the ACID properties of atomicity, consistency, isolation, and durability. We will first explain the architecture of the system and then, describe how the hypermedia system is integrated with information retrieval capability, and finally integrated with DBMS capabilities.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.964-966
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• 2005

This paper proposes a distributed algorithm to maintain the Delaunay triangulation of moving points. We assume that every point is a processor which can only communicate with the adjacent points connected by edges in the Delaunay triangulation. The topology changes of the Delaunay triangulation due to the movement of the points are updated automatically by local operations of the points without any centralized processor or global information.

• International Journal of Computer Science & Network Security
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• v.22 no.6
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• pp.275-287
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• 2022

As a result, for the increasing expansion by the university faculties in the field of postgraduate studies, The Deanship of Graduate Studies at the university has been established in 1430 AH/2009 CE to specifically address the needs of the current and prospective graduate population to supervise postgraduate studies programs in coordination with the concerned faculties. This comes as a result for the university being certain of the importance of providing postgraduate studies opportunities that follow the bachelor's degree to qualify our ambitious youth appropriately. The University offers 72 different Graduate programs, awarding doctoral and master's degrees along with fellowships and diplomas in various disciplines like health, engineering, science, literary, and educational. Currently, the financial model for admission and students' payment is manual and paper based. This paper proposes to provide a user interface for Financial Management in Deanship of Graduate studies The basic purpose of the system was to minimize human interference and reduce mistakes placed by human interference, also to have efficient and a fast performance, and perform Electronic Data Interchange (EDI) for various tasks such as billing and scheduling details.