TSSG 법으로 육성한 LiB₃O5 단결정의 제2조화파 발생 특성

권택용(T. Y. Kwon),오학태(H. T. Oh),주정진(J. J. Ju),백현호(H. H. Baek),김정남(J. N. Kim),윤수인(S. I. Yun) 한국광학회 1994 한국광학회지 Vol.5 No.1

이 연구에서는 TSSG 법으로 육성한 LiB₃O_5(LBO) 단결정의 1064 ㎚ 광에 대한 type Ⅰ 및 type Ⅱ 제 2 조화파 발생(SHG) 특성을 조사하였다. Type Ⅰ SHG의 위상정합각은 θm=90°, φm=11.6°였고 angular acceptance bandwidth는 각각 δθintL½=3.3°-㎝½, θφintL=0.27° -㎝로 측정되었다. Type Ⅱ SHG의 위상정합각은 θm=20°, φm=90° 였고 angular acceptance bandwidth는 각각 δθintL=0.65° -㎝, δφintL½=35° -㎝½로 측정되었다. Type Ⅰ NCPM SHG 온도는 149℃였고 temperature bandwidth ΔTL은 4.8℃ -㎝였다. Nd:YAG 레이저의 peak power 가 171 MW/㎠일때 두께가 2.6 ㎜인 LBO 결정의 SHG 변환효율은 약 1.8%였고, 이차 비선형 계수 d₃₂는 약 0.74±0.05 pm/V로 측정되었다. The characteristics of the type Ⅰ and type Ⅱ SHG in LiB₃O_5 crystals grown by TSSG method have been investigated using 1064 ㎚ beam from a Q-switched Nd:YAG laser. The measured phase matching angles and angular acceptance bandwidths were θm=90°. φm=11.6°, δθintL½=3.3°-㎝½. δφintL=0.27°-㎝ for type Ⅰ SHG and θm=20°, φm=90°, δθintL=0.65°-㎝, δφintL½=3.5°-㎝½ for type Ⅱ SHG, respectively. The type Ⅰ NCPM temperature of 1064 ㎚ beam was found to be 149℃ with the temperature bandwidth ΔTL of 4.8℃ -㎝. An energy conversion efficiency of about 1.8% with 2.6 ㎜ thick LBO crystal at an incident power of 171 MW/㎠ was demonstrated. The measured d₃₂ was 0.74±0.05 pm/V.

운동학습,제어,발달 : 자극-반응 적합성이 신속한 머리회전의 반응시간에 미치는 영향

권택용 ( Taeg Yong Kwon ) 한국스포츠심리학회 2015 한국스포츠심리학회지 Vol.26 No.4

Purpose: The purpose of this study was to determine whether yaw head rotational reaction time and premotor time to visual stimuli in central and peripheral visual fields would improve with practice. Method: The task was to make a complete horizontal head rotation regardless of target eccentricity in two response conditions: TOWARD and AWAY conditions. In the TOWARD condition subjects rotated their head in the direction ipsilateral to target appearance for a congruent S-R response. In the AWAY condition subjects rotated their head contralateral to target appearance for an incongruent S-R response. All subjects participated in the following sequence of testing and training: (1) Pre-test, (2) Training (6 days over 2 weeks), and (3) Post-test. Measures associated with yaw head rotations involved with reaction time, premotor time and electromechanical delay. Results: Results revealed shorter yaw head rotation RT in TOWARD and AWAY conditions after 6 days of practice in TOWARD and AWAY conditions. We found the greater observations especially for the centrally placed target. Conclusion: These results suggest greater performance improvements were observed for most subjects when practice and testing were within the same condition, indicating support for the well-known learning specificity phenomena.

한국형 코치-운동선수 관계유지 척도의 타당화

권택용(Kwon, Taeg-Yong),박경석(Park, Kyung-Suk),최영래(Choi, Young-Lae) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.3

The purpose of this study was to gain initial evidence for the reliability and validity of the use of maintenance strategies within the coach-athlete relationship (Coach-Athlete Relationship Maintenance Questionnaire: CARM-Q) developed by Rhind & Jowett (2012) in Korea. The questionnaire includes a 28 item measure with seven sub-scales measuring: conflict management, openness, motivational, preventative, assurance, support, and social network strategies. Factorial invariance (configurational, metric, uniqueness, and factor variance invariance) test indicated that the sports interdependence scale was valid in gender, sports types, school years. The results of the latent means analyses indicated that male athletes were significantly higher than female athletes across seven sub-factors of CARM-Q scale. In addition, the mean scores of individual sport athletes were significantly higher than team sport athletes across the social networks and support. Overall, CARM-Q developed by Rhind & Jowett (2012) was valid in collegiate in Korea and reflect coach-athlete relationship maintenance strategies.

자극행로의 변화가 예측타이밍의 시공간적 정확성에 미치는 영향

권택용(Kwon Taeg-Yong),박상범(Park Sang-Bum) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

The purpose of this study was to investigate the possibility of utilizing visual information about changes in stimulus trajectory by analyzing the effect of unexpected changes in the trajectory of visual stimulus on the spatiotemporal accuracy of coincident timing response. Thirteen subjects performed timing task requiring wrist movement in coincident with the arrival of stimulus light at the target location. During the task, the point of change in the trajectory of stimulus moving at three velocities was manipulated by light emitting diode array. For each trial, the accuracy of timing was measured, from which constant error(CE), absolute error(AE), variable error(VE), and error rate were calculated. Analyses of the results revealed that the timing accuracy differed by stimulus velocity and the point of changes in the stimulus trajectory. CE and AE increased as stimulus velocity became faster and the point of change in the stimulus trajectory was delayed. Also, CE and AE for the point of change-2.5cm condition increased as stimulus velocity became slower. Error rate in the point of change-2.5cm and no-change conditions was larger than those in other conditions. These results suggest that the effect of changes in stimulus trajectory on the spatiotemporal accuracy of coincident timing differs by stimulus velocity, the point of change in the stimulus trajectory and time remained from the point of change to the initiation of response.

The Effect of Target Eccentricity and Stimulus-response Compatibility on the Response Latencies of Ocular Movements in Defensive Movement

권택용(Taeg Yong Kwon) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.45

서로 다른 시야에서 제시되는 시각적 자극에 대한 목표지향적인 반응과 관련해서 방어동작은 자극으로부터 막기 (Toward)와 피하기 동작(Away)을 포함한다. 이러한 방어동작들은 반응의 결과 또는 자극과 반응의 적합도에 따라서 구분되어 질 수 있다. 비록 투기종목 (복싱, 태권도, 유도 등)에서 공격에 대한 선행연구들은 많이 이루어지고 있지만 방어적인 운동은 그 중요성에 비해서 연구가 부족하다. 본 연구에서는 방어반응을 이해하기 위한 노력으로 서로 다른 시야에서 제시되는 시각적 자극에 대해 막기와 피하기 반응 조건에서 신속한 안구운동의 반응을 연구하였다. 안구운동의 측정은 수용할 수 있는 신뢰도 점수를 보여주었으며, 단속성 안구운동 반응시간은 자극의 편심성이 커질수록 자극과 반응이 적합하지 않는 조건에서 길어졌다. 본 연구에서 이용된 안구운동측정방법은 신뢰할 수준의 정확성을 보여주었으며 연구의 결과들은 방어운동에서 안구운동은 자극의 위치와 자극반응 적합성에 영향을 받을 수 있음을 시사한다.

아동기 인지-운동발달 평가도구로써 단속성 안구운동의 적용가능성

권택용(Taeg Yong Kwon),이성노(Seg No Lee) 한국발육발달학회 2013 한국발육발달학회지 Vol.21 No.1

The purpose of this study is to provide theoretical and empirical evidence regarding possibility of adapting saccadic eye movement as tool to evaluate cognitive and motor development in children. Saccadic eye movement tasks can be designed to probe simple sensory-motor process as well as higher cognitive functions using different types of paradigm. Several studies deal with saccadic performance in children. The main findings of the investigation were that saccadic eye movement performance represents a sensitive indicator of maturation of the brain activity and motor development. However, to our knowledge, there are few studies to utilize saccadic eye movement to assess the cognitive and physical development in children. In this review paper, 1) the importance of saccadic eye movement in children, 2) age-related different parameter in saccade, 3) development of brain function related to saccade and finally, the future directions have been discussed.

전체적-주의초점이 숙련자의 골프퍼팅수행에 미치는 영향

신석환 ( Seakhwan Shin ) , 권택용 ( Taegyong Kwon ) 한국스포츠정책과학원(구 한국스포츠개발원) 2020 체육과학연구 Vol.31 No.1

[목적] 본 연구는 숙련자에게 제공할 수 있는 효과적인 주의초점의 형태를 탐색하기 위하여 대안적 주의개념으로 제시된 전체적-주의초점(H-FOA)의 효과를 검증하고자 하였다. [방법] 현재 KPGA에 소속된 선수 27명을 대상으로 하였으며, 외적주의초점, 전체적-주의초점, 통제집단에 무작위로 배정되었다. 실험은 중압감이 가중된 시합 상황에서 실시되었으며, 각 집단의 피험자들은 실험 처치에 따른 다양한 목표거리(4m, 5m 6m)의 퍼팅시합에서 정확성을 평가하여 경기력을 측정하였다. [결과] 흥미롭게도 통제집단에서 퍼팅수행의 정확성(MRE)이 가장 높은 것으로 나타났다. 또한 전체적-주의초점(H-FOA)을 이용한 집단에서도 통제집단과 유사한 경기력을 확인할 수 있었다. 외적주의초점의 이점은 확인할 수 없었다. [결론] 본 연구의 결과에서 숙련된 골프선수들에게는 외적주의초점의 제공이 불필요할 수 있는 것으로 나타났으며 중압감 상황에서 선수들에게는 전체적-주의초점의 형태가 효과적인 주의지침임을 제안한다. [Purpose] The purpose of this study is to investigate the effectiveness of the holistic focus of attention(H-FOA), presented as an alternative attention concept, to explore effective attention focus for the skilled performer. [Methods] KPGA's experts (N = 24) were selected and randomly assigned to external focus, overall focus and control groups. Experiments were conducted in the putting competition of the target distance (4m, 5m and 6m). Performance was measured for accuracy. [Results] Interestingly, the control group showed the high putting performance accuracy (MRE). In addition, the holistic focus of attention group was able to identify performance similar to the control group. The effect of external attention focus could not be confirmed. [Conclusions] Results of this study indicate that external focus may be unnecessary for skilled golfers. Rather, holistic focus of attention is highlighted for the improvement of players’ attentional focus under pressure.

Stackable Structural Reactor의 DME FPSO 적용 연구

송택용(Taekyong Song),모용기(Yonggi Mo),권옥배(Okbae Kwon),한자령(Jaryoung Han),이지혜(Jihye Lee) 한국가스학회 2015 한국가스학회 학술대회논문집 Vol.2015 No.11

9.2 GHz 주파수 차이로 위상잠금된 두 외부 공진기 다이오드 레이저의 제작 및 특성 조사

권택용,신은주,유대혁,이호성,인민교,조혁,박상언,Kwon, Taek-Yong,Shin, Eun-Ju,Yoo, Dae-Hyuk,Lee, Ho-Sung,In, Min-Kyo,Cho, Hyuk,Park, Sang-Eon 한국광학회 2002 한국광학회지 Vol.13 No.6

9.2GHz 주파수 차이로 위상잠금(phase-locking)된 레이저 시스템을 제작하여 그 특성을 조사하였다. 외부공진기 다이오드 레이저 2대를 제작하고, 두 레이저가 9.2GHz 주파수 차이를갖도록 디지털 회로를 이용하여 위상잠금 하였다. 위상잠금된 두 레이저의 맥놀이 신호의 스펙트럼을 측정하였으며, 이로부터 신호의 반송률이 약 93%임을 알 수 있었다. 위상잠금된 두 레이서의 상대 선폭은 2Hz 이하였다. 위상잠금된 두 레이저의 맥놀이 신호의 위상잡음을 측정하였으며, 측정된 위상잡음 스펙트럼으로부터 적분시간 1s 이하에서 상대적인 주파수 안정도를 계산하였다. 적분시간 1s 이상에서는 주파수 측정방법으로 상대적인 주파수 안정도를 측정하였는데, 적분시간 20s 에서 알란편차는 $2.7{\times}10^{-19}$였다. We have constructed two extended-cavity diode lasers which are phase-locked with a 9.2 GHz frequency offset. We adopted a digital servo circuit for the phase-locking. The relative linewidth of the phase-locked lasers was less than 2 Hz. Using the measured beat spectrum, we found the carrier concentration to be about 93 %. We measured phase noise and relative frequency stability of the lasers. The Allan deviation at the gate time of 20 s was $2.7{\times}10^{-19}$.

전체적-주의초점이 한국무용 ‘자반뛰기’ 동작에 미치는 영향

권리은(Kwon, Li-Eun),신석환(Shin, Seak-Hwan),권택용(Kwon, Taeg-Yong) 한국체육과학회 2020 한국체육과학회지 Vol.29 No.4

The purpose of this study is to verify that the effects of the holistic-focus of attention on the movement of the “Jaban-ttwigi”, a body control task, for Korean dance. This study was conducted on 30 Korean dance experts (21.17 years old) who were over 9.7(± 1.22) years, and were randomly assigned to internal focus, external focus, and holistic-focus of attention. Experiments were performed by performing pre-test and treatment experiments by using the ‘Jaban-ttwigi’, and collected video data. Interactions between groups by time point appeared, and there was no difference according to the attentional focus condition in the pre-test, but in the treatment experiment, the holistic-focus of attention condition showed the highest evaluation score of motion compared to the internal focus condition. However, there was no significant difference from the external focus condition, and the external focus condition showed low volatility in performance at the pre-treatment-post stage. The results of this study confirm that the suggestion of internal focus is not effective for the experts, and the external focus is considered to be the most similar to the existing performance strategy. It is noteworthy that the holistic-focus of attention can be a more effective attention guideline than the external attention focus in body control tasks such as dancing, and these results need to be verified under longer-term practice conditions.