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Liquid Level Sensor based on Microstrip Patch Antenna
Jeehyun Lee(이지현),Kibae Lee(이기배),Jinho Bae(배진호),Chong Hyun Lee(이종현) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
We propose a liquid level sensor based on microstrip patch antenna, which has resonant frequencies dependent on physical dimensions of its radiation patch and permittivity of dielectric material between radiation patches. By investigating resonant frequency shift caused by the dielectric materials composed of liquid and air gap, we can detect the specific level of liquid. We also derive a relative permittivity according to the ratio of the liquid to air. By adopting a microstrip patch antenna of which chamber is 5mm height, we show that the proposed sensor can detect level of water with 2mm resolution of which frequency separation is at least 30MHz.
In Search of the Characteristics IB Educational System and Backward Design
( Jeehyun Lee ) 경북대학교 중등교육연구소 2019 Asia Pacific Journal of Educational Research Vol.2 No.2
International Baccalaureate(IB), which is spreading around the world, transcends the boundaries of the specific subject. It focuses on the international perspective and emphasizes working together with others through fusion and harmony. It teaches creative and practical ability to solve complicated problems. We need people who can work with others to solve the problem with their own personality. Through education, students can grow into either passive and trapped thinkers, or active and open minded thinkers. To become a person of the capabilities and skills who is required by the present age, he must be able to access a lot of information and use what he has learned. Thus, the purpose of this study is to explore the characteristics of curricula meanings of IB educational System and its implications. The main reason of this study is to explore the signification of IB curriculum, the relevance of IB educational system and backward design by analyzing the previous educational implications and the discussions.
Optimal Control of an Influenza Model with Seasonal Forcing and Age Structure
Jeehyun Lee,Jungeun Kim,Hee-Dae Kwon 한국산업응용수학회 2012 한국산업응용수학회 학술대회 논문집 Vol.7 No.1
This study considers an optimal intervention strategy for influenza outbreaks. Variations in the SEIAR model are considered to include seasonal forcing and age structure, and control strategies include vaccination, antiviral treatment, and social distancing such as school closures. We formulate an optimal control problem by minimizing the incidence of influenza outbreaks while considering intervention costs. We examine the effects of delays in vaccine production, seasonal forcing, and age-dependent transmission rates on the optimal control and suggest some optimal strategies through numerical simulations.
Lee, Jeehyun,Cho, Gilsoo THE KOREAN FIBER SOCIETY 2014 FIBERS AND POLYMERS Vol.15 No.3
A short audible distance for the rustling sound of combat uniform fabric helps to reduce soldiers' exposure to the enemy forces. The objectives of this study were to evaluate mechanical properties and sound characteristics of combat uniform fabrics, to investigate their influence on audible distance at which fabric's rustling sound can be reached to human ear, and to establish prediction models for audible distance using mechanical and psychoacoustic parameters. Six types of combat uniform fabrics were used as test specimen. Mechanical properties of the specimens were measured according to the KES-FB system and the acoustic characteristics of the fabrics were analyzed by the Sound Quality System. Audible distances of the fabric sounds were assessed by 30 male soldiers. The audible distances were determined by the distance of which the participants walked away from a starting point in a straight line until they could not hear the sound. Water repellent finished fabric (W-WR), which showed the highest values of bending rigidity, shear stiffness, sound pressure level, loudness(Z) and sharpness(Z) among all fabrics, had the longist audible distance. Fabric for summer season (W-S) had the shortest audible distance in all frictional speed levels, which indicates the best auditory camouflage performance. Coefficient of friction was chosen as the variable affecting loudness(Z) of fabric sounds. Loudness(Z) was finally chosen as the prediction parameter for the audible distance by path analysis.
Lee, Changho,Kim, Kyungun,Han, Seunghoon,Kim, Sehui,Lee, Jun Hoon,Kim, Hong Kyun,Kim, Chulhong,Jung, Woonggyu,Kim, Jeehyun SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS 2014 JOURNAL OF BIOMEDICAL OPTICS Vol.19 No.3
<P>An intraoperative surgical microscope is an essential tool in a neuro- or ophthalmological surgical environment. Yet, it has an inherent limitation to classify subsurface information because it only provides the surface images. To compensate for and assist in this problem, combining the surgical microscope with optical coherence tomography (OCT) has been adapted. We developed a real-time virtual intraoperative surgical OCT (VISOCT) system by adapting a spectral-domain OCT scanner with a commercial surgical microscope. Thanks to our custom-made beam splitting and image display subsystems, the OCT images and microscopic images are simultaneously visualized through an ocular lens or the eyepiece of the microscope. This improvement helps surgeons to focus on the operation without distraction to view OCT images on another separate display. Moreover, displaying the OCT live images on the eyepiece helps surgeon's depth perception during the surgeries. Finally, we successfully processed stimulated penetrating keratoplasty in live rabbits. We believe that these technical achievements are crucial to enhance the usability of the VISOCT system in a real surgical operating condition.</P>