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Jang, Jaeson,Paik, Se-Bum Society for Neuroscience 2017 The Journal of neuroscience Vol.37 No.50
<P>In higher mammals, orientation tuning of neurons is organized into a quasi-periodic pattern in the primary visual cortex. Our previous model studies suggested that the topography of cortical orientation maps may originate from moire interference of ON and OFF retinal ganglion cell (RGC) mosaics, but did not account for how the consistent spatial period of maps could be achieved. Here we address this issue with two crucial findings on the development of RGC mosaics: first, homotypic local repulsion between RGCs can develop a long-range hexagonal periodicity. Second, heterotypic interaction restrains the alignment of ON and OFF mosaics, and generates a periodic interference pattern map with consistent spatial frequency. To validate our model, we quantitatively analyzed the RGC mosaics in cat data, and confirmed that the observed retinal mosaics showed evidence of heterotypic interactions, contrary to the previous view that ON and OFF mosaics are developed independently.</P>
Duckhee Chae,Keiko Asami,Jaeson Kim,Kukhyeon Kim,Jeeheon Ryu 한국간호과학회 2021 한국간호과학회 학술대회 Vol.2021 No.10
Aims: There is a higher prevalence of depression and lack of exercise in midlife immigrant women than in native women. Virtual reality videos can provide emotional well-being and activity trackers that can facilitate physical activity. However, no combined intervention has targeted midlife immigrant women. The purpose of this pilot test is to assess the feasibility, acceptability, and preliminary efficacy of home-based intervention with virtual reality and Fitbit activity trackers. Methods: One group pre- and post-test design was used. Participants were 11 community-dwelling midlife immigrant women in South Korea. The 4-week home-based intervention consisted of a wearable activity tracker and 360-degree nature videos in virtual reality. Participants were taken through an orientation and provided with brochures on the proper use of virtual reality headsets (Oculus Go) and activity monitors (Fitbit charge 3). During the intervention period, participants were instructed to practice the intervention at their home for 35-40 minutes (5-10 minutes of virtual videos and 30 minutes of walking) every day, at least 5 days per week. Feasibility was assessed by examining participant retention, while acceptability was assessed using a 5-point scale of satisfaction. Physical activity, mood, depression, self-efficacy, and body composition were compared before and after intervention. To evaluate the difference between the baseline and 4 weeks after, paired t tests were conducted. Results: Participant retention was 91.7%. Participants had significant improvements in activity hours (t=-5.23, p<.001) and negative affect (t=2.82, p=.018). There were no statistically significant differences in body composition, depression, positive affect, and self-efficacy. Furthermore, most participants (90.9%) answered “satisfied” or “very satisfied” with the intervention. Conclusions: Home-based intervention delivered through virtual reality videos and Fitbit activity trackers seems feasible and has preliminary efficacy in improving mood and physical activity. Further research is warranted to evaluate the effectiveness in a more rigorous randomized controlled trial.
Sailamul, Pachaya,Jang, Jaeson,Paik, Se-Bum Springer US 2017 Journal of computational neuroscience Vol.43 No.3
<P>Correlated neural activities such as synchronizations can significantly alter the characteristics of spike transfer between neural layers. However, it is not clear how this synchronization-dependent spike transfer can be affected by the structure of convergent feedforward wiring. To address this question, we implemented computer simulations of model neural networks: a source and a target layer connected with different types of convergent wiring rules. In the Gaussian-Gaussian (GG) model, both the connection probability and the strength are given as Gaussian distribution as a function of spatial distance. In the Uniform-Constant (UC) and Uniform-Exponential (UE) models, the connection probability density is a uniform constant within a certain range, but the connection strength is set as a constant value or an exponentially decaying function, respectively. Then we examined how the spike transfer function is modulated under these conditions, while static or synchronized input patterns were introduced to simulate different levels of feedforward spike synchronization. We observed that the synchronization-dependent modulation of the transfer function appeared noticeably different for each convergence condition. The modulation of the spike transfer function was largest in the UC model, and smallest in the UE model. Our analysis showed that this difference was induced by the different spike weight distributions that was generated from convergent synapses in each model. Our results suggest that, the structure of the feedforward convergence is a crucial factor for correlation-dependent spike control, thus must be considered important to understand the mechanism of information transfer in the brain.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (10.1007/s10827-017-0657-5) contains supplementary material, which is available to authorized users.</P>
Designing an Integrated Curriculum for Preschool
Greg Tabios Pawilen,Jaeson P. Arre,Eloida F. Lindo 환태평양유아교육연구학회 2010 Asia-Pacific journal of research in early childhoo Vol.4 No.2
Integrated curriculum is a popular curriculum design used in organizing preschool curriculum. This study aims to analyze how teachers design an integrated curriculum. Specifically, it describes: (1) how do teachers plan an integrated curriculum; (2) what common themes are used; and (3) what factors are influential or considered in integrating the curriculum. Since the study was conducted in a Christian school, it also analyzes the influence of the Christian faith in the curriculum. Curriculum analysis and focus-group discussion with preschool teachers and administrators were done to gather the necessary data for the study. The results of the study show that the thematic approach is dominantly used in integrating the curriculum. The themes usually derived from big ideas or topics related to science, social studies, and some concepts and activities that are interesting to the learners. Several factors are also found to be influential in designing the curriculum. The study also found out that Christianity has a great impact or influence in designing the curriculum. Biblical stories, and Christian values are always integrated in the selection of sub-topics and activities in the curriculum.
BRAF somatic mutation contributes to intrinsic epileptogenicity in pediatric brain tumors
Koh, Hyun Yong,Kim, Se Hoon,Jang, Jaeson,Kim, Hyungguk,Han, Sungwook,Lim, Jae Seok,Son, Geurim,Choi, Junjeong,Park, Byung Ouk,Do Heo, Won,Han, Jinju,Lee, Hyunjoo Jenny,Lee, Daeyoup,Kang, Hoon-Chul,Sho Nature Publishing Group 2018 Nature medicine Vol. No.
UWB/WiFi 모듈 기반의 내시경 카메라용 무선전송 설계
심동하 ( Dongha Shim ),이재곤 ( Jaegon Lee ),이재선 ( Jaeson Yi ),차재상 ( Jaesang Cha ),강민구 ( Mingoo Kang ) 한국인터넷정보학회 2015 인터넷정보학회논문지 Vol.16 No.1
본 논문에서는 초광각 무선 내시경을 제안하고 구현하였다. 내시경은 초광각 카메라 모듈과 무선전송 모듈로 구성된다. 162도의 초광광 렌즈와 이미지 센서 및 카메라 프로세서가 3x3x9 cm3 크기의 케이스에 함께 패키지 된다. 무선전송 모듈로 UWB 기반 및 WiFi 기반의 플랫폼을 각각 구현한다. UWB 기반 모듈은 의 고화질 영상을 MJPEG로 압축하여, 2048x1536 (QXGA)의 해상도에서 15 fps의 속도로 영상을 전송하며, 최대 데이터 전송속도는 41.2 Mbps에 달한다. 구현된 내시경은 의료용 내시경의 화각과 해상도 수준을 가지며, 상용 고성능 WiFi 내시경과 비교할 때 ~3X의 화각과 16X의 해상도를 갖는다. WiFi 기반의 모듈은 640x480 (VGA)의 해상도에서 30 fps의 속도로 영상을 스마트 기기로 스트리밍 하며, 최대 1.5 Mbps의 데이터 전송속도를 보여준다. 구현된 모듈은 저가격의 의료용 무선 전자 내시경의 구현 가능성을 보여주며, U-헬스케어, 응급처치, 가정의료, 원격진료 등에 효과적으로 활용될 수 있을 것으로 기대된다. Ultra-wide-angle wireless endoscopes are demonstrated in this paper. The endoscope is composed of an ultra-wide-angle camera module and wireless transmission module. A lens unit with the ultra-wide FOV of 162 degrees is designed and manufactured. The lens , image sensor, and camera processor unit are packaged together in a 3x3x9-cm3 case. The wireless transmission modules are implemented based on UWB- and WiFi-based platform, respectively. The UWB-based module can transmit HD video to a computer in resolution of 2048x1536 (QXGA) and the frame rate of 15 fps in MJPEG compression mode. The maximum data transfer rate reaches 41.2 Mbps. The FOV and the resolution of the endoscope is comparable to a medical-grade endoscope. The FOV and resolution is ~3X and 16X higher than that of a commercial high-performance WiFi endoscope, respectively. The WiFi-based module streams out video to a smart device with th maximum date transfer rate of 1.5 Mbps at the resolution of 640x480 (VGA) and the frame rate of 30 fps in MJPEG compression mode. The implemented components show the feasibility of cheap medical-grade wireless electronic endoscopes, which can be effectively used in u-healthcare, emergency treatment, home-healthcare, remote diagnosis, etc.