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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.
Semiclassical Boltzmann transport theory for multi-Weyl semimetals
Park, Sanghyun,Woo, Seungchan,Mele, E. J.,Min, Hongki American Physical Society 2017 Physical Review B Vol.95 No.16
<P>Multi-Weyl semimetals (m-WSMs) are a new type of Weyl semimetal that have linear dispersion along one symmetry direction but anisotropic nonlinear dispersion along the two transverse directions with a topological charge larger than one. Using the Boltzmann transport theory and fully incorporating the anisotropy of the system, we study the dc conductivity as a function of carrier density and temperature. We find that the characteristic density and temperature dependence of the transport coefficients at the level of Boltzmann theory are controlled by the topological charge of the multi-Weyl point and distinguish m-WSMs from their linear Weyl counterparts.</P>
Effect of oral antioxidants on the progression of canine senile cataracts: a retrospective study
Park, Sanghyun,Kang, Seonmi,Yoo, Sukjong,Park, Youngwoo,Seo, Kangmoon The Korean Society of Veterinary Science 2022 Journal of Veterinary Science Vol.23 No.3
Background: Cataracts are the leading cause of impaired vision or blindness in dogs. There are many antioxidants that can prevent cataract progression, but whether they are clinically effective in dogs has not been established. Objectives: To analyze the delaying or preventing effect of oral antioxidants on canine senile cataracts through retrospective analysis. Methods: Medical records of dogs from January 1, 2015 to July 10, 2020 were reviewed. Dogs that were 8 yr of age or older with senile cataracts were included in this study. The dogs were divided into two treatment groups (dogs administered with Ocu-GLO supplement and dogs administered with Meni-One Eye R/C supplement) and a control group (dogs that were not administered any supplement). Dogs with incipient and immature cataracts were included in this study. Altogether, 112 dogs (156 eyes) with incipient cataracts and 60 dogs (77 eyes) with immature cataracts were included. The period of time that cataracts progressed from incipient to immature, and from immature to mature was recorded for each dog. Results: There was no significant delaying effect on the progression of incipient cataracts. However, both Ocu-GLO (hazard ratio = 0.265, p = 0.026) and Meni-One (hazard ratio = 0.246, p = 0.005) significantly delayed the progression of immature cataracts compared to the control group. Conclusions: Although there was no significant delaying effect of oral antioxidants on incipient cataract progression, antioxidants could be used to delay the progression of senile immature cataract.
Park, Seung Yoon,Lee, Sanghyun,Park, Kyong Soo,Lee, Hong Kyu,Lee, Wan WILEY-VCH Verlag 2006 Proteomics Vol.6 No.4
<P>Genetic or biochemical abnormalities in mitochondria are closely associated with apoptosis, aging, cancer, and other chronic degenerative diseases. Mitochondrial dysfunction resulting from mitochondrial DNA (mtDNA) depletion dispatches retrograde signals to the nucleus to compensate by altering the expression of various genes. In this study, a proteomic approach was used to gain insight into the nuclear gene targets of mitochondrial stress signaling and the pathophysiological mechanisms associated with mitochondrial dysfunction. We have used 2-DE to characterize the nuclear gene responses resulting from mtDNA depletion in L6 GLUT4myc myocytes. Our results showed that 77 polypeptides were differentially expressed in mtDNA-depleted cells; 33 polypeptides were down-regulated and 44 polypeptides were up-regulated. Of these differentially expressed polypeptides, 40 were identified as 36 different proteins by MALDI-TOF MS. These proteins are related to various cellular responses, such as apoptosis, cellular metabolism, signaling and cytoskeleton functions. It is suggested that the insulin resistance developed in mtDNA-depleted myocytes may be associated with disorganization of cytoskeleton assembly, and that cellular mtDNA depletion might promote the ability to evade apoptosis or other death effectors.</P>
A Noise-Robust Straight Line Detection Algorithm
Sanghyun Park,Jongho Kim,Euisung Kang 한국멀티미디어학회 2011 한국멀티미디어학회 국제학술대회 Vol.2011 No.-
In this paper, a simple and precise algorithm is proposed for detecting straight line segments in an image corrupted by impulse noise. The proposed algorithm is based on small eigenvalue analysis. The proposed approach scans an input edge image from the top left corner to the bottom right comer with a moving mask. A covariance matrix of a set of edge pixels of a connected region within the mask is determined. Each line segment is separated from the edge image where several line segments are overlapped, and then the eigenvalue of each line segment is calculated. The results of the experiments emphasize that the proposed algorithm outperforms the existing algorithm which uses small eigenvalue analysis.
A Research of Power-Efficient Driving Scheme for Auto-Focus on Image Sensor Module
Sanghyun Cha(차상현),Chanwoo Park(박찬우),Yuenjoong Lee(이연중),Byoungwon Hwang(황병원),Ohjo Kwon(권오조),Deukhee Park(박득희),Kyoungsoo Kwon(권경수),Jaeshin Lee(이재신),Shinhwan Hwang(황신환) 제어로봇시스템학회 2009 제어·로봇·시스템학회 논문지 Vol.15 No.12
We present a power-efficient driving scheme that consists of piezoelectric actuator and driver IC for AF (Auto-Focus) on ISM (Image Sensor Module). The piezoelectric actuator is more power-efficient than conventional voice coil motor actuator. And high power-efficiency driver IC is designed. So the proposed driving scheme using designed piezoelectric actuator and driver IC is more close to recent trend of green IT. The diver IC should guarantee fast and accurate performance. So, the optimum driving method and high accurate frequency synthesizer are proposed. The die area of designed driver IC is 2.0 × 1.6㎟ and power consumption is 2.8㎽.