• Journal of the Korean Society for Aviation and Aeronautics
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• v.29 no.3
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• pp.15-23
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• 2021

Personal Air Vehicle is expected to be a promising solution to relieve traffic congestion using urban airspace. The development of related technologies such as materials or batteries has been accelerated. In addition, commercial transportation services are being prepared. When fierce competition begins in the PAV market, even technologically superior products will disappear without choices by consumers. Therefore, demand factors should be reflected in PAV development to enhance competitiveness. In the paper, values were estimated for the major technological attributes of PAV. Stated preference data were collected through a survey, and the conjoint method and ordered probit model were adopted. Thereafter, it was confirmed that the value would be high in the order of dual mode, drone-type appearance, and noise reduction. Some R&D strategies were proposed based on this.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.31 no.1
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• pp.107-117
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• 2023

본 연구의 목적은 공항 내 혁신시설에 대한 공항이용객의 평가를 통해 혁신적 서비스 양상과 기틀을 파악하는 것이다. 본 연구는 소비행동의 관점에서 공항이용객의 추구 혜택, 지각된 혁신성, 수용 의도, 구조화에 대한 욕구 등 4가지 개념의 이론에 근거하여 수행되었다. 공항의 혁신시설을 이용한 경험이 있는 299명 성인을 대상으로 2022년 7월 5일부터 9일까지 자료를 수집하였다. 수집된 자료는 공항이용객의 추구혜택과 수용의도 간의 관계에서 공항이용객의 지각된 혁신성의 매개효과 및 공항 이용객의 추구혜택과 지각된 혁신성 간의 관계에서 구조화에 대한 욕구의 조절효과를 분석하였다. 연구 결과, 공항이용객의 추구 혜택은 수용 의도에 긍정적 영향을 미치고, 지각된 혁신성은 수용 의도에 긍정적 영향을 미치는 것으로 나타났다. 이러한 결과는 공항 이용객의 욕구에 근거하여 혁신적인 기능을 향상시켜야 함을 시사한다.

• Journal of the Semiconductor & Display Technology
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• v.23 no.2
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• pp.28-32
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• 2024

The personal mobility Sharing service is currently active. Especially, electric scooters are widely utilized because they can move comfortably at a high speed over a short distance with a simple driving method. Its driving method is easy, but there is no protection device to protect the bare body. So, there is a greater accident than other means of transportation, and if two people are on board, there is higher accident probability. However, since there is no specific ways to prevent multi-person boarding yet, we propose a multi-person boarding detection model using tilt and pressure sensor. The proposed method measures the tilt degree and direction by using a tilt sensor installed in the center of the board plate and detects multi-people riding.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2007.05a
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• pp.53-54
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• 2007

It is predicted that Japan will be in super-aged society at 2010. Recently elderly house buildings with self-supporting life and personal care senior house types have supplied over the area. So Elderly house buildings in Japan were studied for characters of room arrangement, through documents and internet from Jan. 2007 to Apr. 2007. Five cases built since 2000 were examined. There were self-supporting life house type, personal care senior house type, convenient facilities, etc. There were not lots of facilities in the building. Generally multi-purpose dining room and general bath room, lots for car and bicycle or restaurant or kindergarten or home helper station or green food shop or day service or moving service or clinic were there. These facilities were shared with local community. The reason of not being many facilities in the building was that the houses were located at urban with good transportation and convenient facilities. The residents in the building were get the utmost of regional facilities and the local people did the facilities in it because scare facilities in the building and fluent facilities in region. So strong community was composed of the residents and local people, on the contrary.

• Journal of Korean Society of Transportation
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• v.12 no.1
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• pp.43-54
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• 1994

The major concern of this paper is to investigate the properties of a stochastic equilibrium for each model system in terms of a consumer welfare measure. The primary assumption for this study is that a trip-maker would choose the trip from his origin zone which maximizes his personal welfare. This assumption, finally, leads to a singly constrained gravity model. The consumer welfare measure is derived from the concept of expected welfare of randomly sampled trip-makers. Each of the four different models considered in this paper is differentiated depending on the complexity of its model or the definition of its travel function. In this study, three different regions are chosen for the purpose of taking into account the effects of different zone-systems on the properties of a stochastic equilibrium : (i) Archerville region (5 zone) ; (ii) San Francisco Bay regions (30 zones) ; (iii) Houston, TX region (199 zones). It is concluded that almost identical, "global" consumer welfare values can be obtained in some cases of the gravity-type trip distribution models based on a stochastic equilibrium.

• Transactions of the Korean Society of Automotive Engineers
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• v.20 no.3
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• pp.37-44
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• 2012

In this paper, the application of robust fuel gauge algorithm in the external environment to general fuel gauge system is proposed. The proposed fuel gauge system is composed of two modules which are Moving Average Filter (MAF) and Inclination Filter (IF). They are used to show correctly the amount of fuel in the external environment which are curve road, slope or acceleration/deceleration driving. In parallel, verification and validation processes using Software In the Loop Simulation (SILS) in personal computer and Hardware In the Loop Simulation (HILS) similar to actual vehicle environments are established. Through this research, it turned out to be possible to operation of gauge become correct of external environment.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.19 no.2
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• pp.37-44
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• 2011

This paper summarizes the HVO concept and procedures, presents a summary of the research and results, and outlines areas where future HVO is required. This concept enables people to get their destinations through shortest paths with advanced air traffic control system and equipments. The concept's key feature is that pilots maintain their own separation from other aircraft using air-to-air datalink and on-board software which are needed for supporting flight information present on the high Way in the sky display and airborne internet. By assigning Self-Controlled Area which assume pilot have separation responsibility, controllers evaluated SATS HVO concept as a successful method on the view of reduced workload and increased traffic level on high volume operation.

• The Korean Journal of Emergency Medical Services
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• v.17 no.3
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• pp.39-51
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• 2013

Purpose: The purpose of the study is to investigate the influencing factors of turnover intention in hospital paramedics. The factors included the job condition, job stress, and turnover intention. Methods: The subjects were 200 paramedics in hospital. Data were analyzed using frequency, t-test or one way ANOVA, Pearson's correlation, and multiple regression analysis with SPSS WIN 20.0 program. Results: Job stress was 3.59 points; job condition, 2.96 points; turnover intention 3.64 points. When the job stress was high, the satisfaction with job condition was very low and the turnover intention increased. When the job satisfaction was high, turnover intention decreased. factors affecting the turnover intention were annual income, turnover frequency, workload, and working department, role conflict, and personal relationship. Conclusion: It is necessary to establish the job description of paramedics and improve the working condition in the hospitals.

• Journal of Institute of Control, Robotics and Systems
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• v.5 no.8
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• pp.907-913
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• 1999

For an automated transportation system like PRT(Personal Rapid Transit) system or IVHS, an efficient vehicle-merging algorithm is required for smooth operation of the network. For management of merging, collision avoidance between vehicles, ride comfort, and the effect on traffic should be considered. This paper proposes an unmanned vehicle-merging algorithm that consists of two procedures. First, a longitudinal control algorithm is designed to keep a safe headway between vehicles in a single lane. Secondly, 'vacant slot and ghost vehicle' concept is introduced and a decision algorithm is designed to determine the sequence of vehicles entering a converging section considering energy consumption, ride comfort, and total traffic flow. The sequencing algorithm is based on fuzzy rules and the membership functions are determined first by an intuitive method and then trained by a learning method using a neural network. The vehicle-merging algorithm is shown to be effective through simulations based on a PRT model.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1203-1208
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• 2010

Recently, there are environmental issues for sustainable transportation system to pursue the energy-efficient and environment-friendly public urban transit. These transportation system needs to offer demand-oriented high-quality service being on the same level with cab service for urban space. PRT(Personal Rapid Transit), small track-guided vehicle, is repeatedly mentioned as a possible alternative for the new urban public transportion system, but but there are not many researches on the operational optimal routing for PRT network. In this paper, the concept of PRT and general optimal routing methods are reviewed. And we suggest the optimal routing method for city-wide PRT network with multi-vehicles and stations, junctions and directional arcs. Futher research directions for PRT routing are presented.