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The Effect of Health Promotion Behavior on Emotional Happiness
이병현,김정애 국제문화기술진흥원 2019 International Journal of Advanced Culture Technolo Vol.7 No.1
This study was designed to examine the affect health promotion behavior to emotional happiness for 20-30’s in Korea through cross-sectional descriptive research. There were a total of 279 people who participatedin this study, 198(71.0%) were males and 81(29.0%) were females. The data collection period was fromDecember 1 to 15, 2018. The tools used to measure health promotion behaviors were HPB (Health PromotionBehavior) developed by Walker et al., and emotional happiness was PANAS (Positive and Negative AffectScale) by Developed by Watson et al., All data was analyzed using SPSS 18.0 program. As a result of analysis,62 (49.6%) were solving interpersonal problems and stress relief while drinking, and the people who ate twicea day were most frequent. In conclusion, health promotion behaviors have a strong correlation with emotionalhappiness. Based on the above results, it was suggested that the program of happiness for lining in the 20-30sage groups should strengthen the contents of health responsibility, guidance of substance abuse, formation ofsocial relations and self actualization.
Design and Analysis of Switching Timing for High Power GPS Meaconing Jammer
이병현,오인근,김성일 사단법인 항법시스템학회 2018 Journal of Positioning, Navigation, and Timing Vol.7 No.4
The purpose of satellite navigation meaconing jamming is to make the target GPS receiver calculate false navigation by meaconing the received satellite signals. At this time, since the received and transmitted signals have the same frequency, the back-lobe reduction level of antenna should be -160 dB when the Effective Radiated Power (ERP) is 1 Watt (30 dBm). Therefore, meaconing jamming is impossible by merely reducing the back-lobe level of antenna when the transmitter and receiver are in proximity to each other. In general, the transmitter and receiver are isolated by the time division method to eliminate such transmission/reception interference. This paper studied the optimal switching timing between transmitting and receiving when isolating the time division transmission and reception for GPS meaconing jamming.
Ranging Performance for Spoofer Localization using Receiver Clock Offset
이병현,서성훈,지규인,염동진 사단법인 항법시스템학회 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.3
Ranging Performance for Spoofer Localization using Receiver Clock Offset
Synthetic Jet을 이용한 실속 박리의 폐루프 제어
이병현,김민희,최병훈,김현진,김종암 한국항공우주학회 2013 한국항공우주학회 학술발표회 논문집 Vol.2013 No.11
앞전 실속 상태의 NACA 64A210 에어포일에 대한 synthetic jet의 유동 제어 능력을 검증하기 위해 단계적인 실험 및 전산수치해석을 수행했다. 첫 번째 단계에서는 synthetic jet-off 조건에서 NACA 64A210 에어포일의 기본 공력 특성을 분석했고, 이를 바탕으로 유동 박리를 감지하는 파라미터를 도출했다. 그 다음 단계에서는 실속 받음각 조건에서 open-loop control 실험을 수행했고, 전산수치해석에 의한 유동 구조와 비교하여 synthetic jet 작동 조건 변화에 따른 유동 특성을 분석했다. 마지막 단계에서는 받음각 변화에 따른 유동 박리를 감지하여 closed-loop control로 구동되는 synthetic jet 시스템을 구성하여 실험을 수행했다. 다양한 실험 및 수치 해석 분석 결과, 에어포일의 앞전 실속을 제어하기 위한 synthetic jet 유동 제어 성능이 효과적임을 확인할 수 있었다. Step-by-step experimental and computational studies were conducted to verify the flow control capability of synthetic jet on a stalled NACA 64A210 airfoil. First, experimental and numerical data were examined by analyzing the baseline characteristics of NACA 64A210 when synthetic jet was off. Next, open-loop control experiments were carried out to demonstrate the flow separation control in the post-stall regime. Experimental results were analyzed with the help of the computed flow structures. Finally, closed-loop control experiments were conducted by detecting the onset of flow separation. Based on various comparisons, active flow control using synthetic jet was found to be effective for the leading-edge stalled airfoil.
이병현,이기원,이상훈,김경희 한국식물생명공학회 2009 식물생명공학회지 Vol.36 No.4
Tall fescue is an open-pollinated, perennial, cool season grass species widely used for forage and turf. Tremendous progress has been made in genetic transformation of tall fescue in the past decade. Methods for generating transgenic tall fescue plants have been developed based on biolistic transformation and Agrobacterium-mediated transformation. Potentially useful agronomic genes have been tested to environmental stress tolerance, herbicide tolerance and improve forage quality in tall fescue plants. We review progress in biotechnological improvement of tall fescue and discuss future molecular breeding of this species.
이중 차분된 도플러 측정치의 특성을 이용한 위치 영역에서 평활화 기법
이병현,지규인,이달호 제어로봇시스템학회 2011 제어로봇시스템학회 각 지부별 자료집 Vol.2011 No.7
Precise positioning using differenced measurement is one of the most commonly used techniques. And in general for precise positioning, pseudo-range and carrier phase measurement is used. In this paper, double differenced pseudo-range and phase measurements are used for precise positioning. Furthermore, Doppler measurement is used to enhance the performance of velocity estimation. And the properties of double differenced Doppler enhance the performance of positioning by smoothing in position domain.