• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2009년도 춘계학술대회 논문집 에너지변화시스템부문
• /
• pp.212-214
• /
• 2009

The polymer electrolyte membrane fuel cell(PEMFC) with the advantages of low-operating temperature, high current density, low cost and volume, fast start-up ability, and suitability for discontinuous operation becomes the most reasonable and attractive power system for transportation vehicle and micro-grid power plant in a household. 200W PEMFC(Polymer electrolyte membrane fuel cell) system applied to middle and small-scaled micro-grid power system was constructed by this study, then the electrical characteristics and diagnosis of the fuel cell were analyzed with thermal variation.

• 신재생에너지
• /
• 제1권3호
• /
• pp.42-50
• /
• 2005

This paper deals with the economic feasibility model and analysis of a hydrogen fuel-cell vehicle [FCV] against two similar types of non-business vehicles fueled with gasoline [GV] and diesel [DV] considering greenhouse gas [GHG]. Considering the price of vehicles and annual operating cost, we build a classical economic feasibility model. Since the economic feasibility could be affected by many input factors such as the prices of vehicles, the price of fuels, annual driving distance and so on, we estimate the average future values of input factors, which is defined as "the average case". Based on the average case, we assess the representative economic feasibility of a FCV with/without GHG, and by changing various annual driving distances, we assess its economy in terms of net-present value, internal rate of return, and payback period. In addition, we make some sensitivity analysis of its economic feasibility by changing the values of the critical input factors one at time. Based on the average case, it turns out that the consumer of a FCV could save 25,000 won/year for a GV, but the consumer could pay 120,000 won/year more for a DV. This indicates that gasoline vehicles could be replaced gradually by FCVs in Korean market which might be formed by those consumers driving annually more than approximately 14,800 km. As the results of our sensitivity analysis, it turns out that a FCV is no more economical if the difference of the prices between FCV and GV is more than 10,130,000 won or the price of hydrogen fuel could be more than 5,136 won/kg.

• 한국해양공학회지
• /
• 제21권2호
• /
• pp.67-74
• /
• 2007

Maritime and Ocean Engineering Research Institute (MOERI), a branch of KORDI, has designed and manufactured a model of an autonomous underwater vehicle (AUV) named ISiMI (Integrated Submergible for Intelligent Mission Implementation). ISiMI is an AUV platform to satisfy the various needs of experimental test required for development of challenging technologies newly investigated in the field of underwater robot; control and navigational algorithms and software architectures. The main design goal of ISiMI AUV is downsizing which will reduce substantially the operating cost compared to other vehicles previously developed in KORDI such as VORAM or DUSAUV. As a result of design and manufacturing process, ISiMI is implemented to be 1.2 m in length, 0.17 m in diameter and weigh 20 kg in air. A series of tank test is conducted to verify the basic functions of ISiMI in the Ocean Engineering Basin of MOERI, which includes manual control with R/F link, auto depth, auto heading control and a final approach control for underwater docking. This paper describes the implementation of ISiMI system and the experimental results to verify the function of ISiMI as a test-bed AUV platform.

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2006년 창립20주년기념 정기학술대회 및 국제워크샵
• /
• pp.347-350
• /
• 2006

Maritime and Ocean Engineering Research Institute (MOERI), a branch of KORDI, has designed and manufactured a model of an autonomous underwater vehicle (AUV) named ISiMI(Integrated Submergible for Intelligent Mission Implementation). ISiMI is an AUV platform to satisfy the various needs of experimental test required for development of challenging technologies newly investigated in the field of underwater robot; control and navigational algorithms and software architectures. The main design goal of ISiMI AUV is downsizing which will reduce substantially the operating cost compared to other vehicles previously developed in KORDI such as VORAM or DUSAUV. As a result of design and manufacturing process, ISiMI is implemented to be 1.2m in length, 0.17m in diameter and weigh 20 kg in air. A series of tank test is conducted to verify the basic functions of ISiMI in the Ocean Engineering Basin of MOERI, which includes manual control with R/F link, auto depth, auto heading control and a final approach control for underwater docking. This paper describes the implementation of ISiMI system and the experimental results to verify the function of ISiMi as a test-bed AUV platform.

• 한국IT서비스학회지
• /
• 제15권4호
• /
• pp.25-39
• /
• 2016

The drone is an unmanned aerial vehicle which has no human pilot. Drones can be classified into military drones, commercial drones, and personal drones by usage. Also, drones can be classified from large-sized to nano-sized drone by size and autonomous, remote controlled drone by control type. Especially, military drones can be classified into low-altitude drones, medium-altitude, and high-altitude drones by altitude. Recently, the drone industry is one of the fast growing industries in the world. As drone technologies have become more advanced and cost-effective, Korean government has set its goal to become a top-level country in drone business. However, the government's strict regulation for drone operations is one of the biggest hurdles for the development of the related technologies in Korea and other countries. For example, critical problems for drone delivery can be classified into technical issues and institutional issues. Technical issues include durability, conditional awareness, grasp and release mechanisms, collision avoidance systems, drone operating system. Institutional issues include pilot and operator licensing, privacy rules, noise guidelines, security rules, education for drone police. This study analyzes the trends of the drone industry from the viewpoint of technology and regulation. Also, we define the business areas of drone utilization. Especially, the drone business types or models for public sector are proposed. Drone services or functions promoting public interests need to be aligned with the business reference model of Korean government. To define ten types of drone uses for public sector, we combine the business types of government with the future uses of drones that are proposed by futurists and business analysts. Future uses of drones can be divided into three sectors or services. First, drone services for public or military sectors include early warning systems, emergency services, news reporting, police drones, library drones, healthcare drones, travel drones. Second, drone services for commercial or industrial services include parcel delivery drones, gaming drones, sporting drones, farming and agriculture drones, ranching drones, robotic arm drones. Third, drone services for household sector include smart home drones.

• 항공우주시스템공학회지
• /
• 제14권1호
• /
• pp.68-73
• /
• 2020

본 논문은 산악 지형, 도심, 함정, 교량 등에서 수직 이·착륙 비행, 제자리 비행, 고정익기처럼 저속 및 고속비행을 할 수 있는 덕티드 추진체를 사용한 수직 이·착륙 초소형 무인 항공기 개발 동향을 기술한다. 이 항공기는 여러 측면에서 헬리콥터와 고정익기와는 비행 특성이 다르다. 미육군 미래 전투 체계와 DARPA의 OAV 프로그램의 목적은 운용자에 안전하고 낮은 음향 특성을 갖는 수직 이·착륙 덕티드 팬 초소형 무인 항공기 개발이다. 현재의 초소형 무인 항공기에 영상/적외선 카메라를 탑재하고 숲이나 언덕 뒤에 숨어 있는 적을 정지비행과 응시로 약 1 시간 동안 감시 및 정찰을 한다. OAV의 Class-I은 개인 병사가 배낭에 담아 운반할 수 있는 크기와 무게의 수직 이·착륙 덕티드 MAV 개발이다. Class-II는 Class-I보다 두 배의 운용 시간과 더 넓은 범위의 비행이 가능한 유기체의 수직 이·착륙 덕티드 팬 초소형 무인 항공기 개발이다. 초소형 무인기는 장시간 운용을 위해 현재의 '호버 및 응시'에서 '퍼치-앤-응시'으로 기술을 발전시켜야 한다. 근 미래의 OAV 개념은 유·무인 지상 차량이 주행하는 동안에 차량의 상부에 자동 이착륙하고, 탑재된 상태로 이동하고, 재급유, 재충전, 재이륙하는 합동 운용으로 임무 능력과 효율성을 확장하는 것이다. 덕티드 MAV는 지상 차량의 착륙 패드에서 자동으로 이착륙하기 위해 저렴한 초소형 GPS를 활용한 고정밀 상대 위치 기술 개발이 필요하다. 또한, VTOL 덕티드 MAV와 유·무인 지상 차량 간에 유기체의 협업 동작이 가능케하는 공통 명령과 제어 아키텍처를 개발할 필요가 있다.

• 한국ITS학회 논문지
• /
• 제16권4호
• /
• pp.54-63
• /
• 2017

본 연구는 광역전철 활성화를 목표로 승용차 대비 경쟁력 평가를 위한 수단선택모형을 개발하였다. 연구대상 노선은 수도권의 경의선과 중앙선이며, 열차운행 구간은 두 노선을 연결하는 일산역부터 구리역까지 설정하였다. 수단선택모형은 잠재선호조사(SP) 자료를 이용한 개별행태모형이며, 교통수단선택의 경쟁구도는 승용차와 급행열차이다. 연구 결과, 수단선택모형이 적정한 수준으로 도출되었으며, 이를 이용하여 통행자의 시간가치와 탄력성 값이 나타내는 특성을 분석하였다. 분석결과 광역전철에서 급행열차를 운행할 경우에는 통행비용의 감소보다는 통행시간의 단축에 주안점을 두는 것이 더욱 효과적으로 나타났다. 또한 이 같은 측면에서 개별노선간의 직결운행을 확대하고 급행열차를 운행하여 환승시간과 차내시간을 줄여주는 정책 추진이 요구된다.

• 한국전자통신학회논문지
• /
• 제7권6호
• /
• pp.1479-1485
• /
• 2012

주차관리 시스템은 주차장에서 주차 정보를 제공하여 운전자에게 주차의 편리성을 제공한다. 동시에 다수의 센서, 디스플레이와 제어모듈을 이용하여 아주 소량의 전기 에너지 만을 소모한다. 친환경 빌딩 설계의 요구가 점차 증가함에 따라 주차관리 시스템의 운용 전력 감축 문제가 이슈화 되고 있다. 본 논문에서는 주차관리 시스템의 감지기와 디스플레이 장치의 설계와 소비 전력 감축의 결과를 제시한다. 이 시스템은 무선 Park Tile 과 Park Disk를 사용하여 전력소비를 감축 시키고, 여러 개의 주차 공간 감지기와 자동차 카운터, 정보 디스플레이 장치, 안내 터미널과 제어장치로 구성되어 있다. 그리고 시스템구조 설계와 통신망 설계, 주차 정보 서비스 시나리오 계획, 배터리 수명 제어, 운영전력 평가 등이 수행되었다. 주차장당 운영전력은 0.93KW로 평가 되었으며, 이는 기존 시스템의 20%정도 이고 매년 유지비는 기존 시스템에 비해 18%에 해당된다.

• 한국항행학회논문지
• /
• 제28권1호
• /
• pp.68-76
• /
• 2024

최근 국내외 무인기 시장이 급속도로 성장하고 UAM과 같은 도심 내 UAV 운용의 중요성이 증가함에 따라 UAV의 고장으로 인한 인명 및 재산 피해에 대한 안전 관리 및 규제 체계가 부각되고 있다. 본 연구에서는 안전한 UAM 비행 경로 계획을 위해 운용 지역의 위험을 평가하는 위험 비용 모델들을 비교 분석하고, 각 모델의 주요 한계점을 식별하여 향후 모델 개발 시 고려해야 할 사항들을 도출하였다. 본 연구는 UAM 운용의 안전성 향상을 위한 기초적인 모델을 제공함으로써, UAM 비행 경로 계획 관련 분야의 기술적 개선과 정책 결정에 중요한 기여를 할 것으로 기대된다.

• Journal of Power Electronics
• /
• 제11권4호
• /
• pp.408-417
• /
• 2011

The plug-in hybrid electric vehicles (PHEVs) are specialized hybrid electric vehicles that have the potential to obtain enough energy for average daily commuting from batteries. The PHEV battery would be recharged from the power grid at home or at work and would thus allow for a reduction in the overall fuel consumption. This paper proposes an integrated power electronics interface for PHEVs, which consists of a novel Eight-Switch Inverter (ESI) and an interleaved DC/DC converter, in order to reduce the cost, the mass and the size of the power electronics unit (PEU) with high performance at any operating mode. In the proposed configuration, a novel Eight-Switch Inverter (ESI) is able to function as a bidirectional single-phase AC/DC battery charger/ vehicle to grid (V2G) and to transfer electrical energy between the DC-link (connected to the battery) and the electric traction system as DC/AC inverter. In addition, a bidirectional-interleaved DC/DC converter with dual-loop controller is proposed for interfacing the ESI to a low-voltage battery pack in order to minimize the ripple of the battery current and to improve the efficiency of the DC system with lower inductor size. To validate the performance of the proposed configuration, the indirect field-oriented control (IFOC) based on particle swarm optimization (PSO) is proposed to optimize the efficiency of the AC drive system in PHEVs. The maximum efficiency of the motor is obtained by the evaluation of optimal rotor flux at any operating point, where the PSO is applied to evaluate the optimal flux. Moreover, an improved AC/DC controller based Proportional-Resonant Control (PRC) is proposed in order to reduce the THD of the input current in charger/V2G modes. The proposed configuration is analyzed and its performance is validated using simulated results obtained in MATLAB/ SIMULINK. Furthermore, it is experimentally validated with results obtained from the prototypes that have been developed and built in the laboratory based on TMS320F2808 DSP.