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        • KCI등재

          중학교 초임체육교사의 생활지도 경험에 대한 현상학적 연구

          김승환 ( Kim¸ Seunghwan ),김민규 ( Kim¸ Minkyu ) 인하대학교 교육연구소 2021 교육문화연구 Vol.27 No.4

          본 연구는 중학교 초임체육교사의 생활지도 경험과 교직생활에서의 변화는 무엇인지에 대해 심층적으로 탐색하고, 교육적 의미를 현상학적으로 도출하는데 목적이 있다. 이를 위해 중학교 초임체육교사 5인을 연구 참여자로 선정하여 개인별 심층면담을 진행하고 문자서술자료를 수집하였다. 본 연구의 결과는 다음과 같다. 생활지도의 중심현상은 총 4가지 범주, 12가지 주제 모음으로 분류되었다. 첫째, ‘편협하게 알고 있던 생활지도’ 는 예비체육교사 시절의 단편적 경험에 바탕을 둔 것으로 생활지도 개념과 중요성을 잘 알지 못했던 것으로 나타났다. 둘째, ‘학교 일상에서의 경험을 통해 습득한 생활지도’는 생활지도의 진정한 의미를 알게 되고 역량을 갖추며 발전하는 과정으로 나타났다. 셋째, ‘교과 지도와 함께하는 생활지도’ 는 체육수업을 생활지도의 무대로, 신체활동을 생활지도의 수단으로 활용하는 과정을 통해 체육수업이 생활지도가 될 수 있고, 생활지도가 체육교과의 또 다른 역할로 받아들여지는 등 상호 간의 선순환적 환류가 일어나는 것으로 나타났다. 넷째, ‘초임체육교사의 생활지도 경험을 통한 삶의 변화’ 는 생활지도 활동이 학생의 학교생활은 물론 교사에게도 전이되어 교사들의 삶도 변화되는 것으로 나타났다. 중학교 초임교사의 생활지도 경험과 의미 탐색을 통해 교사양성기관과 학교현장의 문제점과 개선점 등을 제시하였으며 온라인 교육이 일상적인 수업운영 방식이 되어가는 상황 속에서 생활지도 활동의 운영에 대한 후속연구가 필요하다는 점을 함께 제시하였다. The purpose of this study is to conduct in-depth examination on the experiences and changes on guidance for new middle school physical education teachers, and to phenomenologically deduce its educational meaning. For this study, five novice middle school physical education(PE) teachers were purposefully recruited. These participants took part in in-depth interview and provided documents for this study. The core phenomena of guidance were categorized into a total of 4 categories and 12 topics. First, ‘narrowly-known guidance’ was found to be based on fragmentary experiences while preparing to be a physical education teacher and it was determined that the concept and importance of guidance was unknown. Second, ‘guidance acquired through experiences at school’ was found to be the process of development by knowing the true meaning of guidance and gaining capacities. Third, ‘guidance with class lessons’ used physical education classes the stage for guidance and allowed physical education class serve as guidance through the process of using physical activities as the method for guidance, and that guidance has mutual circulation such as being received as a role other than physical education class. Fourth, it was found that ‘change of life through guidance experience of new physical education teachers’ changed not only the school life of students through guidance activities, but also spread to teachers, thus changing the lives of teachers as well. Through examinations on guidance experience and meaning of new middle school teachers, issues and areas for improvement among teacher fostering institutes and schools were presented, and it was also suggested that follow-up research on the operation of guidance activities are needed in this situation where online education is becoming the normal class operation method.

        • KCI우수등재

          전통무용 태평무 지도자의 전문내용지식 분석

          지승환 ( Ji¸ Seung-hwan ),이한주 ( Lee¸ Han-joo ),곽주현 ( Kwak¸ Ju-hyun ),구소현 ( Koo¸ So-hyun ) 한국체육학회 2021 한국체육학회지 Vol.60 No.2

          전문내용지식(SCK)과 PCK는 학생들의 학업성취 또는 수행 향상과 관련하여 긴밀하게 연결되어 있다. SCK는 교사들이 학생들에게 전달하는 다양한 학습과제를 통해 학업성취에 긍정적인 영향을 미치기 때문이다(Ward, Kim, Ko & Li, 2015). 이 연구의 목적은 한국무용 태평무 지도자들의 SCK를 조사하는 것이다, 중요무형문화재 제 92호 강선영류 태평무를 이수한 지도자 20명이 연구에 참여 하였다. 지도자들의 SCK를 조사하기 위해 (1) 오류지식과 (2) 과제제시 지식관련 자료를 수집하였다. 연구문제는 첫째, 가르치는 학습자의 수준에 따라 지도자들의 오류지파악식은 차이가 있는가? 둘째, 학생들에게 제시하는 연습과제는 학습자 수준에 따라 차이가 있는가? 이었다. 연구결과 첫째, 중급/고급 무용수에 대한 지도자들의 오류지식은 비슷하였다. 둘째, 전달형과 확장형 과제를 가장 많이 제시하였다. 그리고 중급수준 무용수에게는 실제공연 발표상황으로 연습하는 비게임형(AN), 게임형(AG) 과제제시를 많이 제시하였다. 이러한 연구결과는 실제 무용지도자들의 교수행동을 향상시키고, PCK를 개발하기 위한 무용 예술분야에 적합한 전문내용지식 조사연구가 필요함을 시사한다. The purpose of this study was to examine the specialized content knowledge(SCK) of traditional Korean dance instructors. Research questions were whether there were any difference in (1) error detection and (2) instructional task presentation according to dancing ability of observed dancers. Total of twenty dance instructors participated in this study. The SCK data were collected using (1) the description of performance errors of dancers based on video clip of previous performance, and (2) content map (Ward et al., 2015). Data were analyzed using descriptive statistics in relation to the research questions. The results of this study showed that: 1) instructors indicated that there were no big different performance errors of dancers based on the ability of dancers. 2) Also, they presented different instructional task to correct errors of dancers. Instructor used the most common tasks: informing, extension, extension-applying tasks more often than any other tasks. This study provides depth of specialized content knowledge of Korean traditional dance instructors. Analysis of the SCK is a valuable tool to modify teaching behaviors of dance instructor.

        • IPMSM 속도 제어를 위한 비선형 백스텝핑 제어기 설계

          정승환(Seunghwan Jung),서석환(Suhkhoon Suh),조승환(Seunghwan Cho) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11

          본 논문에서는 IPMSM(Interior Permanent Magnetic Synchronous Motor)에서 적용할 수 있는 비선형 백스텝핑 제어 방법을 제안한다. 기존 방법으로 설계한 백스텝핑 제어기는 수식이 매우 복잡하여 수식을 도출하는데 쉽지 않은 반면에, 제안한 설계 방법은 dq축 전류에 관한 수식을 간단히 하였기 때문에 보다 쉽게 설계할 수 있다. 설계한 제어기는 시뮬레이션을 통해 PI 제어기와 비교하여 검증하였다. In this paper, a nonlinear back-stepping control technique is proposed for a speed control of IPMSM(Interior Permanent Magnet Synchronous Motor). A back-stepping controller with conventional method is designed with complex formulas. But, the proposed method is easier to design, because of simplifying the formulas of the dq-axis current. Proposed controller is proved by the simulation comparing with PI controller.

        • KCI등재

          페나키토스코프(Phenakistoscope)를 활용한 영상시스템 연구

          오승환(Oh Seunghwan),오승환(Oh Seunghwan) 한국디지털디자인학회 2011 디지털디자인학연구 Vol.11 No.4

          페나키토스코프의 회전에 의한 움직이는 이미지를 활용하여 동영상을 지각하기 위한 장치들은 현재까지 교구나 에듀테인먼트 등으로 꾸준하게 활용되고 있다. 과거의 장치를 그대로 구현하는 단계에서부터 기업의 마케팅 홍보 퍼포먼스 등 다양하게 응용되고 있다고 판단되나 소수에 의하여 이러한 장치를 직접 구현하기에는 고가장비에 대한 부담이나 표현의 한계가 있다고 사료된다. 따라서 본 연구에서는 과거 회전(回轉)을 통하여 동영상을 구현하기 위한 쏘마트로프부터 포노스코프 까지 잔상효과와 원판 실험의 노력들을 살펴보고 모레이 맥라렌의 뮤직비디오 등 사례 분석을 통하여 회전에 의한 잔상효과와 원판 디스크를 활용한 페나키토스코프 시스템을 3가지로 분류하여 개발 제시하였다. 첫 번째로 2D형 페나키토스코프 시스템은 카메라나 턴테이블 등을 사용하지 않고 원판 디스크 이미지만을 사용하여 구현되는 손쉬운 시스템을 구현 하였고 두 번째로 3차원 가상공간에서의 원판 이미지를 이동 확대 축소 등 조작이 가능하며 색의 명도에 따라 입체 오브젝트로 변조되는 시스템을 개발하였으며 세 번째로 카메라로 촬영된 동영상을 이미지화하여 입체 오브젝트에 맵핑시킨 페나키토스코프 시스템을 제시하였다. Images moving by rotations of Phenakistoscope in other words equipments to perceive moving images are continuously used as education tools and for edutainment until now. They are variously utilized from past ways of using the equipments to business marketing promotion and performances. However there are limits for individuals to use such equipments independently. Therefore in this study persistence of vision in old ways of producing moving images by rotation shown in from Thaumatrope to Phonoscope and efforts of negative disc experiments were researched. Through case analysis of Moray McLaren's music video and such persistence of vision made by rotation and Phenakistoscope system using negative discs are developed and suggested as follows. First 2D Phenakistoscope system was made easily by using only negative disc images without using cameras or turntables. Second a system that allows controls such as moving enlarging and reducing of negative images in 3D virtual space and changes to three dimensional objects with the color brightness was developed. Third a Phenakistoscope system that maps imaged camera filmed movies to three dimensional objects.

        • Contribution to Knowledge of Longhorn Beetles Fauna (Coleoptera: Chrysomeloidea: Cerambycidae) in Korea

          Seunghyun Lee,Seunghwan Oh,Hyunkyu Jang,Woong Choi,Seunghwan Lee 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04

          The longhorn beetle (Coleoptera: Cucujiformia: Chrysomeloidea: Cerambycidae) is one of the major family of coleoptera which contains more than 30,000 species worldwide. Because of their species-diversity, morphological attraction and ecological status, the family has received a massive global attention. However, in Korea, no thorough study on this family has been conducted within last twenty eight years. Here we update the latest knowledge of Korean longhorn beetle fauna. First, we give an historical overview of the longhorn beetle studies in Korea and correct some common species misidentifications. Then we provide the information of updated cerambycidae fauna with 4 new species and 9 species newly reported to Korea. Lastly, we discuss the importance of studying immature stage of cerambycidae and provide brief morphological, ecological information of two recently described species.

        • Robust Estimation of Vehicle Dynamic Behavior by Using Fusion Sensors

          Seunghwan Baek,Jungkwang Choi,Heungseob Kim,Moonyoung Yoon,Kwangsuck Boo 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11

          This paper presents the development of an algorithm for vehicle dynamics estimation by using four 3-axis acceleration sensors which are located in the MR-CDC damper for vehicle dynamics control. The sensor fusion algorithm has been developed to identify road information and estimate vehicle dynamics behavior instead of the yaw rate. The Kalman filter has been also designed to estimate the yaw rate of the vehicle and provides the yaw rate as well as the estimation error. The outputs of the 4 sensor pairs according to 4 suspensions have been fused to provide an accurate and robust estimation of the yaw rate by weighted sum in which the weighting factors are inverses of the estimation errors. The proposed sensor fusion algorithm has been also evaluated by comparison with the yaw rate sensor at center of the vehicle gravity. The robust and accurate estimation of the vehicle dynamics has been achieved even under the failed sensor or noisy environment.

        • LeCramFS: an efficient compressed file system for flash-based portable consumer devices

          Seunghwan Hyun,Hyokyung Bahn,Kern Koh IEEE 2007 IEEE TRANSACTIONS ON CONSUMER ELECTRONICS - Vol.53 No.2

          <P>Cost-effectiveness is one of the most critical factors in the development of portable consumer devices. The use of compression techniques is a simple but effective solution for achieving such cost-effectiveness. This paper gives a comprehensive analysis of file system level compression techniques for portable consumer devices. Since conventional compressed file systems are optimized for disk like devices and relatively abundant computing resources, they are not suitable for portable devices with small amount of memory and weak processing power. This paper presents the design and implementation of LeCramFS, which is a new read-only compressed file system designed for small portable devices and flash memory. Experiments by implementation show that the proposed file system outperforms conventional ones in terms of memory-efficiency and I/O performance.</P>

        • Estimating Desired Yaw Rate and Control Strategy Analysis on Developed Air ESC System for Performance Evaluation

          Seunghwan Chung,Hyeongcheol Lee 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

          The leading automotive manufacturers have attempted to apply active brake systems to passenger and commercial vehicles. The ESC (electronic stability control) system helps drivers to maintain directional stability and control over steering and under steering. Previous studies on passenger vehicle ESC systems have mainly dealt with the control algorithm and evaluation results. In addition, few papers have considered bus and commercial ESC systems. Therefore, this study proposed a method for estimating the desired yaw rate using the already developed ESC system. The desired yaw rate is estimated from the steering wheel angle, vehicle speed, and vehicle parameters. This paper presents the results of a sine with dwell evaluation analysis of a large bus equipped with an ESC system. Through this process, we are able to estimate the ESC control strategy of the leading producer of commercial buses based on an air brake system. The bus ESC evaluation results can be used as a reference for the development of the ESC control algorithm.

        • Advanced Control Strategy for Electric Power Steering System to Improve Steering Assist Torque Stability

          Seunghwan Chung,Hyeongcheol Lee 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

          The EPS (electric power steering) system has been used to replace the conventional HPS (hydraulic power steering) system in vehicles. This system assists the steering effort of the driver using an electric motor and a gear force reduction. In a previous study, an EPS control method was proposed that used the driver’s steering input torque and vehicle velocity. In addition, many papers have introduced estimation and control methods for the EPS motor’s angular velocity or angular torque to reduce the sense difference for the HPS. Therefore, this paper proposes an advanced control strategy for EPS that uses the lateral force of the front wheels. In addition, we experimented with this proposed control algorithm using a simulation and confirmed that it reduced the assist torque and saved motor power. Although it is difficult to obtain the lateral wheel force of the tires for the proposed method, it is able to reduce the torque ripple of the EPS actuator, as well as troublesome problems with steering wheel vibration. Moreover, this EPS control strategy can improve a vehicle’s dynamic stability.

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