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김정래,김민규,Kim, Jeongrae,Kim, Mingyu 한국항공운항학회 2014 한국항공운항학회지 Vol.22 No.3
The coverage area of GNSS regional ionospheric correction model is mainly determined by the disribution of GNSS ground monitoring stations. Outside the coverage area, GNSS users may receive ionospheric correction signals but the correction does not contain valid correction information. Extrapolation of the correction information can extend the coverage area to some extent. Three interpolation methods, Kriging, biharmonic spline and cubic spline, are tested to evaluate the extrapolation accuracy of the ionospheric delay corrections outside the correction coverage area. IGS (International GNSS Service) ionosphere map data is used to simulate the corrections and to compute the extrapolation error statistics. Among the three methods, biharmonic method yields the best accuracy. The estimation error has a high value during Spring and Fall. The error has a high value in South and East sides and has a low value in North side.
국내 과일·채소음료시장의 소비활성화를 위한 시장분석 및 마케팅 전략
김정래 ( Kim Jeongrae ),김범수 ( Beom-su Kim ),김성진 ( Seong-jin Kim ),박지훈 ( Ji-hoon Park ),김종화 ( Jonghwa Kim ) 한국식품유통학회 2022 한국식품유통학회 학술대회 Vol.- No.하계
최근 국내 과채류음료 시장의 성장이 크게 둔화되고 있다. 그동안 과채류음료는 국내 가공용 과일, 채소의 대량 수요처로서 그 중요성이 강조되어 왔으나, 탄산음료, 액상커피 등의 대체품이 등장하면서 과채음료 시장이 급속히 위축되고 있다. 이에 본 연구에서는 소비자의 과채류음료에 대한 선택속성(원료, 가격, 첨가물, 포장용기)을 살펴보고, 그에 따른 마케팅전략을 제시하였다. 이를 위하여 마케팅 분야에서 널리 사용되는 컨조인트 분석의 부분가치 함수모형을 이용하였으며, 시장세분화를 위한 군집분석을 실시하였다. 그 결과, 국내 과채류시장은 ‘맛선호그룹’, 원료선호그룹’,‘편의선호그룹’으로 세분될 수 있으며, 그에 따른 그룹별 마케팅전략을 제시하였다.
김정래 ( Jeongrae Kim ),김종우 ( Jong-woo Kim ),권순민 ( Soon-min Kwon ),박총명 ( Chong-myung Park ),정인범 ( In-bum Jung ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2
유비쿼터스 컴퓨팅 환경에서는 사용자의 의도를 정확히 파악하고 그에 따른 정확한 정보 또는 서비스를 제공하는 것이 중요하다. 현재 보편적으로 사용 중인 키보드와 마우스는 직관성이 결여되었거나 휴대성이 부족하므로 유비쿼터스 환경에 적합한 새로운 입력 시스템이 필요하다. 본 논문에서는 2축 가속도 센서와 2개의 압력센서를 사용하여 무선 센서네트워크 환경에서 사용자의 손동작을 감지하여 컴퓨터를 직관적으로 사용할 수 있는 유비쿼터스 환경에 적합한 입력 시스템(u-Glove)을 설계 및 구현한다.
김정래(Jeongrae Kim),박규식(Kyushik Park),김광일(Kwangil Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
An electro-mechanical actuator is increasingly applied for the active roll control system to improve fuel efficiency and to simplify system configurations. The electric active roll control system (eABC System) has an advantage of rapid response, but it needs gear box with high reduction ratio to generate high torque for vehicle roll attitude control. This reduction gear amplifies the effect of friction and rotating inertia when the actuator rotates, and it influences negative effect on riding performance. The paper introduces some arrangements of motor and gears of the actuator for eARC system, and proposes the optimized actuator structure to improve ride feeling by estimating dynamic characteristics of each arrangement through simulating the dynamic model of the system.
GPS 전리층 모델의 장기간 가용성 및 정확도 변화 분석
김정래 ( Jeongrae Kim ),김용래 ( Yongrae Kim ) 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.6
The Klobuchar ionospheric model included in GPS navigation messages provides ionospheric correction information to single-frequency users. This ionospheric model accuracy has a significant impact on the accuracy of navigation solutions. We examine the GPS navigation messages from 1993 to 2022 and analyze their accuracy, presence of coefficients and accuracy of the Klobuchar model. Early GPS navigation messages often did not include ionospheric data, and even when they did include ionospheric models, the accuracy was often quite low. From 2002, when the accuracy of the ionospheric model was stabilized, until 2022, the accuracy of the ionospheric model is analyzed by comparing it with the ionospheric model of the International GNSS Service (IGS). Changes in accuracy per day and per year and accuracy differences along geomagnetic latitude are analyzed.
김정래(Jeongrae Kim),김태준(Taejoon Kim),신충화(Chunghwa Shin),이제홍(Jehong Lee),이희용(Heeyoung Lee) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
In this study, clutch adaptation algorithm for auto transmission with non-driving condition was proposed. As part of the first study, a survey was evaluated the pressure control of the clutch adaptation control with driving condition. Based on the current pressure adaptation system, new clutch control system was constructed and a MATLAB/Simulink simulator was developed. With this study, TCU(proposed control algorithm) can work more effectively the clutch adaptation of all pressure system with non-driving condition.
김정래(Jeongrae Kim),김태준(Teajun Kim),배수용(Suyong Bae),황승민(Seongmin Hwang),이도희(Dohee Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Automatic transmission is convenient for drivers to drive. Because of fuel economy regulations and , recognition about pollution, Many kinds of Multi-Step Automatic Transmissions are developed. This study has developed an optimal shift control parameter calculation model for automatic transmission. It was carried out for the purpose of quickly developing the TCU shift control base hydraulic data(TCU ROM). As part of the first study, we investigated the torque on the output side and the optimum shifting time of the 8-speed automatic front wheel. Analysis on this survey data can predict responsiveness and shifting. The second study constructed the optimal(ideal) hydraulic model of the control parameters at the shifting time using the automatic transmission hardware specification. Finally, the model were simulated in Matlab Simulink to prove the validity of the development results, and the reliability of the model was finally verified by applying it to a test vehicle. As a result, the precision and robustness of the TCU shift hydraulic pressure value was verified using the shift control parameter calculation model. In addition, it is possible to shorten the overall development schedule through the rapidity of the TCU base ROM production.
편대비행 위성용 거리 및 가속도 관측기 시뮬레이션 모델링
김정래(Jeongrae Kim) 한국항공우주학회 2005 韓國航空宇宙學會誌 Vol.33 No.2
NASA와 독일 DLR의 Gravity Recovery and Climate Experiment (GRACE)는 편대비행을 하는 두 개의 저궤도 위성을 이용하여 지구중력장을 측정하는 연구이다. 주요 관측 장비는 위성 사이의 거리를 측정하기 위한 초단파 거리측정기와 비중력 가속도를 측정하기 위한 정전기 방식의 3축 가속도계이다. 기본설계 및 허용오차 분석 등에 활용하기 위하여 정밀한 관측기 시뮬레이션 모델을 개발하였는데, 본 논문에서는 이러한 모델링 기법과 이를 적용한 궤도 및 중력장 추정기법에 관해 살펴보았다. NASA/DLR Gravity Recovery and Climate Experiment (GRACE) mission, which consists of two co-orbiting low altitude satellites, is to measure the Earth gravity field with unprecedented accuracy. Its key instruments include inter-satellite ranging systems and three-axis accelerometers. For the preliminary design and requirements analysis, extensive instrument simulation models are developed. These modeling techniques and orbit-gravity field estimation techniques are described.