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스포츠팀 내 공유 리더십의 탐색: 스포츠팀의 리더는 사회적 진공상태에서 만들어지지 않는다
박상현 ( Park¸ Sanghyun ),곽민석 ( Kwag¸ Minseok ) 한국체육학회 2021 한국체육학회지 Vol.60 No.1
본 연구는 스포츠팀의 리더가 구성원 간 사회적 관계라는 네트워크 내에서 선택됨을 밝히는 연구로 스포츠팀 내 공유 리더십의 존재에 대한 의미 있는 정보를 제공하는데 주된 목적이 있다. 이와 같은 목적을 달성하기 위해, 서울에 소재한 두곳의 대학축구팀의 선수 44명을 대상으로 한 설문 조사를 시행하였다. 자료 수집 후, UCINET 및 Netdraw를 활용해 각 팀의 리더십 네트워크를 도식화하였으며, 각 리더십 유형별(과업적 리더십, 동기부여적 리더십, 사회적 리더십, 외부적 리더십) 네트워크의 밀도를 추출하였다. 또한, 각 리더십 네트워크 간 상관관계를 도출하기 위한 QAP분석을 실시하였다. 마지막으로 연구대상으로 선정된 두 팀의 사례 분석을 통해 팀 간 공유 리더십 네트워크의 특성에 대해 논의하였다. 연구 결과, 두 팀에서 공식적인 리더인 주장 이외의 비공식적인 리더가 팀원들로부터 선택되어, 공유 리더십의 존재가 발견되었다. 세부적으로 살펴보면, 각 리더십 네트워크 밀도의 범위는 .104에서 .342로 나타났으며, 특정 노드에 집중된 형태가 나타나지 않았다. 또한, QAP 분석 결과에서도 네 가지 형태의 리더십 네트워크 사이에서 낮은 상관관계가 도출되어, 공유리더십의 존재에 관한 실증적인 근거가 발견되었다. The main purpose of this study is to provide meaningful and insightful information regarding the existence of shared leadership in sports teams as revealing that the leaders of sports teams are selected within the social relationship among team members. To achieve the purpose of this study, a survey was conducted on 44 athletes of two university soccer teams which located in Seoul. After finishing data collection, each team’s leadership network was described and the densities of each leadership networks(task leadership, motivational leadership, social leadership and external leadership) were calculated by using UCINET and Netdraw. Next, QAP analysis was performed to extract correlation coefficients among each networks. Lastly, case study was performed to discuss the characteristics of two teams. As a result, the existence of shared leadership was found because some unofficial leaders who are not captain of team selected by the team members. To be specific, each leadership networks were not concentrated on a particular node and the range of density of each leadership network was from .104 to .342. Furthermore, The result of QAP analysis also revealed little bit low correlation coefficients between the four types of leadership networks. It could be considered as empirical evidence of the existence of shared leadership.
Park, Sanghyun,Chun, Min Chul,Park, Solmin,Park, Ga-yeon,Jung, Moonyoung,Noh, Youngji,Ahn, Seung-Eon,Kang, Bo Soo Elsevier 2019 Current Applied Physics Vol.19 No.3
<P><B>Abstract</B></P> <P>Negative capacitance (NC) phenomena is recently suggested as a breakthrough that can lead to the improved transistor by decreasing the subthreshold swing. To understand the NC phenomena, we investigated the effects of the ferroelectric properties such as the remnant polarization depending on the switching cycles in Si-doped HfO<SUB>2</SUB> thin film capacitor. The ferroelectric properties were controlled by using the wake-up effect, in which the remnant polarization enhances as the number of switching cycles increase. The relation between the wake-up effect and the voltage drop region with the negative differential capacitance were elucidated. The dynamic hysteresis loops were fitted based on Landau-Khalatnikov equation, and the free energy as a function of polarization was obtained. The Landau coefficients showed that the double-well feature of the free energy becomes more apparent due to the wake-up. Based on the wake-up effect on NC phenomena, we show that the NC phenomena is well described by Landau-Ginzburg theory of ferroelectrics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Relation between negative capacitance and ferroelectric properties explained based on Landau theory. </LI> <LI> Wake-up effects explained based on Landau theory. </LI> <LI> Effective control of ferroelectric properties using wake-up effect. </LI> </UL> </P>
An Efficient Electronic Wheelchair Seat Balancing Maintain Methodology Applying Smart Sensors
Sanghyun Park,Jinsul Kim,Yonggwan Won 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.1
In this paper we propose a new solution which utilizing the Gyro Sensor and Tilt Sensor in real-time controlling the balance of wheelchair seat. The existing wheelchair systems have the risk of falling when users go uphill because of the uneven weight allocation. But when applying our new method, the wheelchair seat can automatically adjust to maintain the balance therefore provides a safer and more stable ride. In order to adjust the seat correctly, we calculate the seat angle using Tilt Sensor. However, due to the law of inertia when wheelchair is moving there is deviation in output value of Tilt Sensor. To solve this problem, a Gyro sensor is used for measuring the acceleration and get the correct value of tilting angle. Through various experimentations we can prove that by taking advantage of Gyro sensor and Tilt sensor combination, the system is able to determine the correct seat angle in both cases when the wheelchair moving or not. We also tackle the power consumption issue in wheelchair, by using ZigBee sensor module to retrieve terrain information in advance and controlling the balance by two motors thus the overall power consumption for seat balancing is reduced significantly.
Seamless lamination of a concave-convex architecture with single-layer graphene.
Park, Ji-Hoon,Lim, Taekyung,Baik, Jaeyoon,Seo, Keumyoung,Moon, Youngkwon,Park, Noejung,Shin, Hyun-Joon,Kyu Kwak, Sang,Ju, Sanghyun,Real Ahn, Joung RSC Pub 2015 Nanoscale Vol.7 No.43
<P>Graphene has been used as an electrode and channel material in electronic devices because of its superior physical properties. Recently, electronic devices have changed from a planar to a complicated three-dimensional (3D) geometry to overcome the limitations of planar devices. The evolution of electronic devices requires that graphene be adaptable to a 3D substrate. Here, we demonstrate that chemical-vapor-deposited single-layer graphene can be transferred onto a silicon dioxide substrate with a 3D geometry, such as a concave-convex architecture. A variety of silicon dioxide concave-convex architectures were uniformly and seamlessly laminated with graphene using a thermal treatment. The planar graphene was stretched to cover the concave-convex architecture, and the resulting strain on the curved graphene was spatially resolved by confocal Raman spectroscopy; molecular dynamic simulations were also conducted and supported the observations. Changes in electrical resistivity caused by the spatially varying strain induced as the graphene-silicon dioxide laminate varies dimensionally from 2D to 3D were measured by using a four-point probe. The resistivity measurements suggest that the electrical resistivity can be systematically controlled by the 3D geometry of the graphene-silicon dioxide laminate. This 3D graphene-insulator laminate will broaden the range of graphene applications beyond planar structures to 3D materials.</P>
Park, Chihyun,Ahn, Jaegyoon,Yoon, Youngmi,Park, Sanghyun Oxford University Press 2012 Bioinformatics Vol.28 No.15
<P>Identifying functional relation of copy number variation regions (CNVRs) and gene is an essential process in understanding the impact of genotypic variations on phenotype. There have been many related works, but only a few attempts were made to normal populations.</P>