차량 설계시 적용되는 비선형 해석

이훈표,임석현 한국자동차공학회 1993 한국자동차공학회 학술강연초록집 Vol.- No.-

파워 볼링 투구 동작 시 상지분절의 3차원 움직임 변화

이훈표 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2

The purpose of this study was to analyze about the motion change of swing from the top point of the back-swing to the terminal point of the follow-through in the power bowling. For these, two male members from the national team and three male university players were chosen for this study. Based on a rigid body model. reflective marker triads were attached on the 3 segments. Three-dimensional Cartesian coordinates for each marker were determined at the time of recording using DLT technique with Kwon 3d 2.1 software. Coordinate data were low-pass filtered using a fourth-order Butterworth with cutoff frequency of 6Hz. The angles of adduction-abduction. extension-flexsion, and pronation-supination about the swing motion were determined for Matlab 6.5. The following conclusion were drawn; 1. In the motion change of the upper and forearm segment during the swing, the flextion and extension showed a consistantly trajectory. But the hand segment showed the motion change of flexion-extension-flexion order. 2. In the adduction and abduction change, the upper and forearm segments showed a same trajectory during the swing motion. But the hand segment showed a many deviation between the subjects. 3. The subjects showed bigger pronation motion than supination at the release event for increase the rotation force of the ball.

볼링 릴리즈 시 볼의 속도에 대한 상지분절의 기여도와 착지구간의 역학적 변인과의 관계

이훈표 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study was to investigate the most effective throwing motion of the bowling by analyzing the biomechanical parameters during the landing phase and the upper limb's contribution to the ball velocity at release. For these, skilled bowlers from the national team and less-skilled bowlers with under one year bowling experiment were photographed and analyzed with the three dimensional cinematography. The result were as follows; 1. Kinematical parameter At the top of the backswing, the less-skilled group kept their upper bodies straightened. While in the release phase both groups showed the contrary results. The less-skilled group accomplished the swing action without changing the angle of their wrist. In contrast, the skilled group displayed extension and flexion at the same phase repetedly. 2. Contribution In the less-skilled group, the contribution that had an effect on the ball velocity appeared in the trunk, the fore arm the upper arm and hand in order. But skilled group appeared in the upper arm the fore arm the trunk, and hand, respectively. 3. Kinetical parameters Maximum ground reaction force in medial-lateral direction of the skilled group was more signilcant in both propelled foot and landed foot compared to that of the less-skilled group. The skilled group displayed the greatest vertical ground reaction force in anterior-posterior direction at the time of using the propelled foot, however as for the minimum regarding the landing foot, both groups showed similar value. The vertical ground reaction force in whole phase was similar to both group.

자기장에 의해서 f=1/4인 경우 조셉슨접합 배열의 초전도체-부도체 상전이

이훈표,차민철 한양대학교 이학기술연구소 2001 이학기술연구지 Vol.3 No.-

자기장이 있는 조셉슨 접합 배열 모델을 연구하였다. 자기장의 효과를 고려하기 위하여 쩔쩔맴이 있는 XY 모델을 살펴보았다. 몬테칼로 방법을 사용하여 (2+1) 차원의 고전 XY 모델에서 쩔쩔맴이 f=I/4 인 경우를 살펴본 결과, 동역학지수 z= 1.0 과 상관관계거리 임계지수 υ=0.4를 얻었는데, 이는 f=1/2인 경우와는 다른 지수 값이다. We have studied the superconductor-Insulator transition in the ]osepshon-junction arrays with a magnetic field. In order to consider the effect of a magnetic field, we have explored the XY model with frustration. In this work, we study the (2+1)-dimensional classical XY model where frustrantion is f=I/4. Using the Monte Carlo methods, we find quantum dynamical exponent z= 1.0 and the correlation length exponent υ =0.4, which is different from the exponent f=1/2.

스포츠 현장 : 한국 볼링의 경기력 현황과 앞으로의 과제

이훈표 한국스포츠정책과학원(구 한국스포츠개발원) 2008 스포츠과학 Vol.102 No.-

관광호텔의 기업문화와 조직유효성 및 조직성과 간의 관계

표성수,이훈구 관광품질시스템학회 2000 관광품질시스템연구 Vol.6 No.1

The purpose of this study was to organize literature related to the corporate culture, the organizational effectiveness and the organizational performance in tourist hotels, and to propose the basic informations for the development of hotel corporate culture in the future through the research results. First, the literature review discusses the overview of concepts, influence factors, classifications, structural elements and determining factors of hotel corporate culture. Next, the concept of the organizational effectiveness, organizational performance and the relationships between hotel corporate culture and the organizational effectiveness and performance were delineated. Thus the first objective was accomplished. A questionnaire was developed by utilizing the items for influence factors of hotel corporate culture, of the characteristics for hotel corporate culture, of the organizational effectiveness and performance in tourist hotels to test hypotheses. To collect data the convenient the super-deluxe and deluxe hotels in Seoul. The 716 usable questionnaires were collected. All hypotheses were rejected at the significance level of 0.05. To determine the factors of the characteristics for hotel corporate culture and the organizational effectiveness, regression analyses were performed. The factors of the characteristics for hotel corporate culture were positively related to the organizational effectiveness. The factors of the characteristics for hotel corporate culture were positively related to the organizational performance. The organizational effectiveness factors in hotels were positively related to the organizational performance. The service orientation of organizational performance in hotels were positively related to the productivity. As a conclusion, this study attempts to relate the corporate culture of tourist hotel, the organizational effectiveness and performance. The author hopes advancements of hotel corporate culture and the organizational effectiveness(performance). and utilization of study results to the real situation in every tourist hotel.

D-Wave 양자 어닐러에서 Adiabatic 전개의 조건에 따른 양자측정

박하윤,이훈표 한국물리학회 2023 새물리 Vol.73 No.11

D-Wave quantum annealers offer the lowest possible energy for combinatorial optimization problems via the quantum adiabatic process, while the accuracy of their results is dependent on various parameters such as the embedding chain strength and the annealing time. In this study, we controlled the annealing time, annealing schedule, and reversible adiabatic process to observe the accuracy of the quantum annealing measurement in each situation on a D-Wave quantum annealer with 5000+ qubits. First, we verified that accuracy generally increases with increasing annealing time. However, it is difficult to markedly increase the quantum annealing time due to strong quantum error. We also found that the accuracy of the quantum annealing measurement increases if the annealing pauses for some time and then begins again. Finally, the reversible adiabatic process enhances accuracy.

Dynamical Cluster Approximation Plus Semiclassical Approximation Study for a Mott Insulator and d-Wave Pairing

김성근,이훈표 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.70 No.12

Via a dynamical cluster approximation with Nc = 4 in combination with a semiclassical approximation (DCA+SCA), we study the doped two-dimensional Hubbard model. We obtain a plaquette antiferromagnetic (AF) Mott insulator, a plaquette AF ordered metal, a pseudogap (or d-wave superconductor) and a paramagnetic metal by tuning the doping concentration. These features are similar to the behaviors observed in copper-oxide superconductors and are in qualitative agreement with the results calculated by the cluster dynamical mean field theory with the continuous-time quantum Monte Carlo (CDMFT+CTQMC) approach. The results of our DCA+SCA differ from those of the CDMFT+CTQMC approach in that the d-wave superconducting order parameters are shown even in the high doped region, unlike the results of the CDMFT+CTQMC approach. We think that the strong plaquette AF orderings in the dynamical cluster approximation (DCA) with Nc = 4 suppress superconducting states with increasing doping up to strongly doped region, because frozen dynamical fluctuations in a semiclassical approximation (SCA) approach are unable to destroy those orderings. Our calculation with short-range spatial fluctuations is initial research, because the SCA can manage long-range spatial fluctuations in feasible computational times beyond the CDMFT+CTQMC tool. We believe that our future DCA+SCA calculations should supply information on the fully momentum-resolved physical properties, which could be compared with the results measured by angle-resolved photoemission spectroscopy experiments.

Properties of the t1 − t2 One-Dimensional Hubbard Model at Finite Temperature

김성근,이훈표 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.4

The one-dimensional t1 − t2 half-filled Hubbard model is considered at finite temperatures T within a dynamical cluster approximation (DCA) with Nc = 24 in combination with a semiclassical approximation (SCA) impurity solver. The SCA approach accounts for long-range spatial fluctuations, where exact numerical impurity solvers can not capture due to computational expense, even though dynamical fluctuations are freezing. Therefore, it can consider both frequency- and momentum-resolved physical properties beyond the DCA with small cluster in combination with exact impurity solvers. By the computation of the static spin-spin correlation, the density of states, and the double occupancy, we examine the description of the frustrated one-dimensional systems at finite T within given approximations. We confirm not only the interaction-driven metal-insulator transition in the regions of t2/t1 > 0.5, but also the commensurate-incommensurate transition by tunning t2/t1 in the strong interaction region. We also observe finite T-driven metal-insulator transition.

휠체어 농구 자유투 동작 시 상체분절의 운동학적 요인 분석

이연종,한희창,이훈표 한국특수체육학회 2003 한국특수체육학회지 Vol.11 No.3

The purpose of this study was to analysis the kinematical variables of one-hand free throw in wheelchair basketball. The subjects of this study were four male wheelchair players registrated in wheelchair basketball athletes. Free throw motions were taken by three video cameras. Three-dimensional coordinates was processed by DLT. The variables were the time duration, displacement, velocity, angle, angular velocity during performing the free throw motion. The result of analysis is summarized as follow. In performing the free throw motion, the duration of backward motion showed longer than its of forward motion, and most subject used forearm for extending the elbow joint than hand upperarm segment. Therefore for improving free throw motion skill in wheelchair basketball players it should be trained the increase of wrist snap motion.