• Journal of Positioning, Navigation, and Timing
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• 제5권3호
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• pp.119-129
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• 2016

This paper presents an integrated navigation system for accurate navigation solution-based safety and convenience services in the vehicular augmented reality (AR)-head up display (HUD) system. For lane-level guidance service, especially, an accurate navigation system is essential. To achieve this, an inertial navigation system (INS)/global positioning system (GPS)/vision/digital map (IGVM) integrated navigation system has been developing. In this paper, the concept of the integrated navigation system is introduced and is implemented based on a multi-model switching filter and vehicle status decided by using the GPS data and inertial measurement unit (IMU) measurements. The performance of the implemented navigation system is verified experimentally.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.1015-1017
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• 2003

Recently, DGPS or RTK-GPS techniques enable us to use satellite based positioning systems with high accuracy. But in urban area, navigation systems suffer from problems such as signal blockage by high-rise buildings, multi-path problems, and so on. So we have to know numbers of visible satellites and quality of signals received at the ground level in urban area as accurate as possible. In this paper, we developed a simulation system called LoQAS [Location service Quality Assessment System, 2002, the University of Tokyo] which can simulate numbers of visible satellites and DOP values using accurate satellite orbital data and 3-D digital map. In this time, we evaluated this system and extended it to deal with reflected signals to assess multi-path problems.

• 한국병원경영학회지
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• 제22권3호
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• pp.105-117
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• 2017

This study was performed to provide medical service providers with useful information for their market competitiveness and decision making. It is regarding positioning map and repositioning map strategy to enforce market competitiveness through bench marking of a specific hospital which has been relatively underestimated in the market. With AHP and biplot analyses for this study, we could identify priority of properties that medical service consumers consider when they choose a university hospital and market competitiveness of alternative university hospitals. It is expected that the study of repositioning strategy to Strengthening Market Competitiveness will provide efficient problem solving method to allocation restricted resources by repositioning the specific university hospital through benchmarking with evaluation factors of the most market competitiveness university hospital. When Inje University Paik Hospital was benchmarked and repositioned, the share of Paik hospital increased and there was only 3.1% difference from Dongah Dong-A University Hospital, which occupied the first place in market competitiveness. Such the results of this study may suggestion management strategies to provide efficient problem solving methods when companies responding to rapidly changing management environments allocation restricted resources.

• 유통과학연구
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• 제19권2호
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• pp.15-24
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• 2021

Purpose: The research is to find out the perception of consumers for the convenience store (c - store) image in an emerging market, with a sample from Ho Chi Minh City. Research design, data, and methodology: Data were collected using a 24 - item structured questionnaire into six factors, namely: store atmospheric, merchandise, supplementary service, customer convenience, sales personnel, promotion. Five hundred consumers shopped at the different c - stores were collected for a multidimensional scaling technique that creates a perceptual map illustrating of c - store image. Results: The results point out that consumers' perception of a different c - store is different. The trend of c- stores are focusing on the dimensions of the function aspect. The customers also put their attention on the psychological dimension, which, in this case, is customer convenience with a sharp point. Almost all stores are bad on store atmospheric in customer- based. Conclusions: The modern retail store chains need to focus on elements to create a store image positioning and improve the perceptions of the consumers towards the store. Besides, customers not only visit the stores, not due to its convenient location, mass media or shopping experience, but also a strong identity for the store's brand image.

• 대한원격탐사학회지
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• 제19권3호
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• pp.181-190
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• 2003

Since the operation of the first satellite-based navigation service, satellite positioning has played an increasing role in both surveying and geodesy, and has become an indispensable tool for precise relative positioning. However, in some situations, e.g. at a low angle of elevation, the use of satellites for navigation is seriously restricted because obstacles like buildings and mountains can block signals. As a mean to resolve this problem, the quasi-zenith satellite system has been proposed as a next-generation satellite navigation system. Quasi-zenith satellite is a system which simultaneously deploys several satellites in a quasi-zenith geostationary orbit so that one of the satellites always stay close to the zenith if viewed from a specific point on the ground of East Asia. Thus, if a position measurement function compatible with CPS is installed in the quasi-zenith and stationary satellites, and these satellites are utilized together with the CPS, four satellites can be accessed simultaneously nearly all day long and a substantial improvement in position measurement, especially in metropolitan areas, can be achieved. The purpose of this paper is to evaluate the effectiveness of quasi-zenith satellite system on positioning accuracy improvement through simulation by using precise orbital information of the satellites and a three-dimensional digital map. Through this developed simulation system, it is possible to calculate the number of simultaneously visible satellites and available area for positioning without the need of actual observation. Furthermore, this system can calculate the Dilution Of Precision (DOP) and the error distribution.

• 지능정보연구
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• 제29권4호
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• pp.69-90
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• 2023

본 연구의 목적은 최근 확산되고 있는 국내 비대면 의료 서비스 애플리케이션의 서비스 속성과 소비자 반응을 정확히 평가하고 각 서비스간 차별성을 시각화하기 위한 방안을 모색하는 것이다. 이를 위해 국내에서 서비스 중인 주요 6개 비대면 진료 애플리케이션의 구글 플레이스토어 사용자 리뷰 데이터 총 2만 건을 수집하였다. 수집된 데이터에 대해 문장 단위로 분리한 후, BERTopic 모델링 기법을 적용하여 각 문장이 속한 서비스 속성에 대한 토픽을 도출하였다. 다음으로 미세조정된 KoBERT 모델을 통해 각 문장의 토픽에 대한 감성 점수를 예측하였다. 분석 결과, 사용자 리뷰로부터 애플리케이션 속성과 진료 속성 두 가지 범주 아래에서 각각 5개와 3개의 서비스 특성 토픽이 발견되었다. 애플리케이션 속성으로는 '예약 시스템', '사용 용이성', '재고 확인', '디자인', '안정성' 등이, 진료 속성으로는 '원격 의료적 속성', '편의성', '배송' 등이 도출되었다. 각 애플리케이션은 이러한 속성들에 대해 다른 수준의 감성 점수를 보였다. 주성분분석을 통해 속성별 감성 점수를 축약하여 2차원 공간 상의 포지셔닝 맵을 생성하였다. 결과적으로 본 연구는 비대면 진료 애플리케이션 사용자 리뷰 텍스트를 바탕으로 실증적 통계 방법과 텍스트 마이닝 기술을 접목하여 서비스 속성 도출, 감성 분석, 제품 포지셔닝 이라는 일련의 체계를 제시하고 있다. 이는 비대면 진료 애플리케이션의 서비스 품질과 소비자 반응을 객관적으로 진단할 수 있는 효과적인 방안이 될 것으로 기대된다.

• Journal of Platform Technology
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• 제11권5호
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• pp.97-103
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• 2023

전 세계에서 보편 일률적으로 사용되는 실외 측위 기술인 GPS와 달리, 실내 측위 기술분야는 아직 다양한 기술이 난립하고 있다. 정확한 실내 위치 정보를 획득하기 위해 대표적인 실내 측위 기술의 표준이 필요한 실정이다. 최근 실내 측위 기술이 고정밀 위치 데이터를 기반으로 한 RTLS(Real Time Location Service) 영역으로 확대되고 있다. 이에 따라 새로운 방식의 실내 측위 기술들이 제안되고 있는데, 인공지능의 발전에 힘입어 스마트폰의 무선 신호 데이터를 사용하는 인공지능 기반의 실내 측위 기술이 빠르게 발전하고 있다. 이때 인공지능 학습에 필요한 데이터를 수집하는 과정에서, 왜곡되거나 학습에 부적합한 데이터가 포함되어 실내 측위 정확도가 낮아지는 결과가 발생하기도 한다. 본 연구에서는 수집된 데이터의 정제 과정을 통해 향상된 실내 위치 확인 결과를 얻기 위한 인공지능학습용 데이터 전처리 기술을 제안한다.

• 경영과학
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• 제29권2호
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• pp.79-90
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• 2012

Focusing on the rapid market penetration of smart phones, the importance of LBS (Location Based Service) is drastically increased. However, traditional GPS method has critical weakness caused by limited availability, such as indoor environment. WPS is newly attractive method as a widely applicable positioning method. In WPS, RSSI (Received Signal Strength Indication) data of all Wi-Fi APs (Access Point) are measured and stored into a huge database. The stored RSSI data in database make single radio fingerprint map. By the radio fingerprint map, we can estimate the actual position of target point. The essential factor of radio fingerprint database is data integrity of RSSI. Because of millions of APs in urban area, RSSI measurement data are seriously contaminated. Therefore, we present the unified filtering method for RSSI measurement data. As the results of filtering, we can show the effectiveness of suggested method in practical positioning system of mobile operator.

• International Journal of Advanced Culture Technology
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• 제9권4호
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• pp.302-306
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• 2021

Indoor localization is one of the basic elements of Location-Based Service, such as indoor navigation, location-based precision marketing, spatial recognition of robotics, augmented reality, and mixed reality. We propose a Voxel Labeling-based visual positioning system using object simultaneous localization and mapping (SLAM). Our method is a method of determining a location through single image 3D cuboid object detection and object SLAM for indoor navigation, then mapping to create an indoor map, addressing it with voxels, and matching with a defined space. First, high-quality cuboids are created from sampling 2D bounding boxes and vanishing points for single image object detection. And after jointly optimizing the poses of cameras, objects, and points, it is a Visual Positioning System (VPS) through matching with the pose information of the object in the voxel database. Our method provided the spatial information needed to the user with improved location accuracy and direction estimation.

• 한국조리학회지
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• 제12권3호
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• pp.219-236
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• 2006

The purpose of this study is to examine the elements that satisfy customers in order for restaurants to survive in competition, and to examine effective positioning strategies. Since the designation of Haeundae in Busan as a Special Tourism Zone, diverse food service markets have been established and various marketing activities are anticipated accordingly. The results of this study can be summarized as follows: First, after the examination of the competitive relationships among restaurants, based on the image similarity data, it was found that Bennigan's, Outback Steakhouse, and T.G.I. Friday's are in close proximity with one another. Hence the fierce competition between them. Secondly, as a result of PC-MDS PROFIT analysis, a positioning map was drawn with image similarity measurement of the restaurants and scores 9 evaluation categories for each brand name as follows: food taste, food price, service, access convenience, hygienic condition and cleaning, atmosphere, various events, circumferential environment, and public image. Thirdly, as a result of MDPREFMAP analysis based on the customer preference, data from the restaurant brand names, an ideal location of a restaurant preferred by customers and the position of restaurant brand names were indicated at the same time.