• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.13 no.6
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• pp.281-288
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• 2013

This research is try to find what kind of LBS service & advertising methods are needed and demanded based on LBS technology by Delphi research method. The professional 50 panels are selected and questioned 3 times for what kind LBS service & advertising methods are needed and demanded. Through first questionnaire six category and detail kinds of LBS service & advertising method are found. and through second & third questionnaire degree of need & demand for detail LBS service & advertising methods are found. The result of this research will help to develope LBS industry & advertising industry by making them prepare for demanded LBS service.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.19 no.8
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• pp.826-831
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• 2008

This paper presents hybrid antenna(HA) design based on shaped reflector for mobile satellite communication. HA is composed of a shaped reflector and a feeder having $1{\times}8$ linear phased array, and reflector shaping method is applied for the performance optimization with minimum aperture size. And, in the feeder design, HA has another merit to minimize the manufacturing cost by optimizing the number of element. Proposed HA is designed at Ka-band and can electrically control a beam pattern within ${\pm}3^{\circ}$ in the basic angle of $+45^{\circ}$ in elevation. This antenna is designed to meet ITU-R S.465-5 for beam pattern including side-lobe level.

• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.709-712
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• 2003

이동체의 위치를 기반으로 하는 다양한 응용 어플리케이션들은 그 영역을 점차 확대하고 있다. 위치를 기반으로 한다는 것은 이동체의 현재위치 뿐만 아니라 과거 및 미래 위치에 대한 예측을 모두 포함한다. 이런 이동체의 위치를 효율적으로 적용할 수 있는 분야가 이동체의 위치 기반 라우팅 분석 이다. 이는 특정 이동체의 과거 위치 궤적, 실시간 현재 위치 추적, 그리고 지도정보와 결합된 최단 및 최적 경로 산출 등의 다양한 분야를 포함한다. 본 논문에서는 이런 위치 기반 라우팅 서비스를 웹 서비스 환경으로 확장한 내용을 언급한다. 웹 지리정보시스템은 사용자에게 친숙한 방법으로 지리, 속성데이터의 디스플레이 및 분석 등 다양한 서비스를 제공한다. 이는 위치기반 라우팅 서비스를 웹 지리정보시스템과의 결합하여 분산 웹 환경에서 효율적으로 라우팅 서비스를 제공할 수 있는 구조를 서술한다. 이동체의 위치는 GPS 기반의 획득 방법으로 얻어지고 지리정보와의 맵 매칭을 통해 실세계의 좌표로 변환하게 된다. 또한, 대용량 위치 데이터를 엑세스 하기 위한 메모리와 기억장치 간의 효율적인 데이터 엑세스 기법이 제시된다. 위치 기반 라우팅 분석의 결과물은 웹상에서 제공되기 위해 XML 기반의 웹 서비스 데이터로 변형된다. 이를 위한 XML 기반의 지리정보 데이터 스카마인 GML 의 적용 기술을 언급한다.

• Fire Science and Engineering
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• v.22 no.1
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• pp.68-75
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• 2008

In this paper, we introduce a fire-detection system which is robust to light sources and environment changing. We can decide the threshold values that classify the regions between a fire flame and light sources by analyzing them in RGB color space. But we could not discriminate quasi-flame region from fire flame region with the value. The difference of mean-histogram technique make it possible to extract flame region more efficient because fire flame is continuously changing after it occurs. In order to validate real fire, this paper uses regional compactness in the end of process. Computer simulation show that proposed method make more robust to light sources and environment changing.

• Journal of KIISE:Software and Applications
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• v.34 no.6
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• pp.530-538
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• 2007

Most existing deductive engines study for optimization of TBox based on Tableaux algorithm. However, in order to deduce mass-storing ABox in reality, it can't be decided in finite time. Therefore, for the efficiency of the deductive engine, there needs to be reasoning technique optimized for ABox. This paper uses the method that changes OWL-DL based Ontology to the form of Rule like Datalog in order to interlock store device such as RDBMS. Ultimately, it tries to in circumstance of real world. Therefor, using Axiom that OWL holds, it suggests reasoning method that applies rules including datatype.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.2
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• pp.143-150
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• 2010

Markerless augmented reality system must have the capability to recognize and match natural objects both in indoor and outdoor environment. In this paper, a novel approach is proposed for extracting features and recognizing natural objects using visual descriptors and codebooks. Since the augmented reality applications are sensitive to speed of operation and real time performance, our work mainly focused on recognition of multi-class natural objects and reduce the computing time for classification and feature extraction. SIFT(scale invariant feature transforms) and SURF(speeded up robust feature) are used to extract features from natural objects during training and testing, and their performance is compared. Then we form visual codebook from the high dimensional feature vectors using clustering algorithm and recognize the objects using naive Bayes classifier.

• Journal of Digital Convergence
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• v.11 no.3
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• pp.285-292
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• 2013

The method of recent information retrieval passes into an semantic search to provide more accurate results than keyword-based search. But in common user case, they are still accustomed to using existing keyword-based search. Hence they are hard to create a typed structured query language. In this paper, we propose to ontology knowledge-base scheme for query interpretation of these user. The proposed scheme was designed based on the OWL-DL for description logic reasoning, it can provide a richer representation of the relationship between the object by using SWRL(Semantic Web Rule Language). Finally, we are describe the experimental results of the similarity measurement for verification of a user query semantic interpretation.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.10a
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• pp.57-60
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• 2001

In this paper, I will describe the trends of multicast address allocation mechanism. IP Multicast efficiently supports this type of transmission by enabling sources to send a single copy of a message to multiple recipients who explicitly want to receive the information. Generally, MAAs server or MADCAP servers are used to allocate multicast addresses. As the need of home networking and autoconfiguring network mechanism has been increased, not only automatic host IP configuration but also automatic multicast address generation mechanism was demanded. in this paper, I will explain the automatic multicast address mechanism in a host. management techniques and the trends of multicast address generation and allocation mechanism that is bong now discussed In IETF.

• Proceedings of the Korea Society for Simulation Conference
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• 2000.11a
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• pp.241-247
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• 2000

날로 복잡해지고 거대해지는 시스템의 추세를 감안할 때 앞으로 시스템 분야의 주요 구성요소간 상호작용을 분석하여 최적의 시스템 운영방안을 도출하기 위해서는 시뮬레이션 기법의 도입이 필수적이다. Simplus 3D는 분석대상 시스템을 주요 객체 단위로 Model 상에 재구성하여 이들의 움직임과 주체적 의사결정 논리를 자체 서술어를 사용하여 묘사하도록 고안된 범용 그래픽 시뮬레이션 소프트웨어로 사용자가 정의한 Logic을 Procedure 또는 Function화하여 별도의 File에 저장하고 재활용 가능하며, 객체별 Logic Trace가 가능하여 객체 시나리오의 상세분석 및 Logic 디버깅이 용이하다. 또한 대상시스템의 특성에 따라 Macro한 수준의 개략적인 묘사부터 Micro한 수준의 제어 알고리듬에 이르기까지 묘사의 수준이 자유롭고, 시뮬레이션에 주로 사용되는 물류설비 및 Logic을 Module로 제공하며 필요시 Custom Logic을 추가할 수 있다. 분포형태는 일양분포, 지수분포, 정규분포 등 다양한 분포형태를 지원하며 9999개까지의 Random Number Seed 지정이 가능하다. 일반 PC에서도 실행 가능하며 3차원 Animation과 다양한 형태의 Report를 제공함으로써 비전문가나 의사결정자가 각종 대안에 대한 시뮬레이션 결과를 시각적으로 확인하여 쉽게 이해할 수 있도록 하였다. Simplus 3D는 현재까지 생산시스템, 항만 및 교통 등의 분야에 광범위하게 활용되고 있으며, 본 논문에서는 기아자동차 WBS 물류시스템 시뮬레이션 모델과 고속도로 톨게이트 시뮬레이션 모델을 활용사례로 소개하고자 한다.

• The Journal of Korean Association of Computer Education
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• v.5 no.1
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• pp.17-25
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• 2002

The purpose of this study is to utilize new way of learning, Problem-Based Learning, for learning of VisualBasic programming. Providing authentic problems is a critical factor for programming learning because the skill may be not such a simple command learning but includes a variety of complexity. The objective of the learning is to develop quiz using VisualBasic programming. With programming skill, students was expected to solve the problem through peer collaboration activities as well as evaluation by peer and group composites. According to descriptive survey, it is concluded that students figure out their own learning status clearly. Furthermore, improvement of learning attitude and participation affect satisfaction and self-confidence.