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Sung, H.,Lee, S. Pergamon ; Elsevier Science Ltd 2015 TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIR Vol.41 No.-
This study intends to empirically verify Jacobs' urban vitality theory, which was based on the observations of her New York City neighborhood in the mid-20th century. To examine the relationship between the residential built environment and walking activity, we used telephone survey data consisting of 1823 valid samples from across Seoul, a city characterized by a high population density and a well-established public transportation system. Respondents were asked questions about their residential location, their demographic and socioeconomic characteristics, and their walking activities. This study then used geographic information systems to measure objective indicators of built environment variables within 500-meter buffer areas based on the home addresses of the respondents. Then, this study constructed multilevel regression models with walking activity as the dependent variable. Our results indicated that walking activity is associated with Jacobs' six conditions for urban vitality, including land use mix, density, block size, building age, accessibility, and border vacuums.
Sung, H.,Lee, J.,Han, K.,Lee, J.K.,Sung, J.,Kim, D.,Choi, M.,Kim, C. Elsevier Science 2014 ORGANIC ELECTRONICS Vol.15 No.2
It is shown that there exists an optimum distance between the plane where nanoparticles (NPs) are positioned and the active layer of Au-NP-embedded organic light-emitting devices (OLEDs) for the maximum external quantum efficiency. Au NPs are precisely positioned in a specific plane in the hole-transport layer using a dry, room-temperature aerosol technique at atmospheric pressure. By controlling the position of the Au NPs and their density, we optimize the external quantum efficiency of the Au-NP-embedded OLEDs, with the maximum efficiency being 38% larger than that of the control device without Au NPs. In contrast to commonly employed methods to incorporate metal NPs in an organic layer, such as vacuum thermal evaporation or spin coating, the aerosol-deposited Au NPs do not penetrate into the underlying organic layer, not only allowing for precise control of the vertical (perpendicular to the substrate surface) position of the Au NPs, but also minimizing damage to the hole-transport organic material. Our electrical and optical characterizations show that the existence of the optimal distance occurs by the competition between the increased electron-hole recombination probability caused by the electrostatic effects of holes trapped in the Au NPs and the metal induced quenching.
가쪽 발목 염좌 경험이 있는 유소년 운동선수의 착지 점프 시 하지 움직임 패턴 및 가변성
( Sunghe Ha ),( Inje Lee ),( Joo-nyeon Kim ) 한국운동역학회 2023 한국운동역학회지 Vol.33 No.3
Objective: This study examined differences in joint kinematics and movement variability of lower extremity between adolescent athletes with and without lateral ankle sprain (LAS) history during drop vertical jump. Method: Fourteen adolescent athletes with LAS history and 14 controls participated in this study. The independent variable was group while dependent variables were 3D joint kinematics and movement variability of hip, knee, and ankle joint. Ensemble curve analyses were conducted to identify differences in movement strategies between two groups. Results: The LAS group showed that greater eversion during jump phase compared with the control group. Additionally, less movement variability was found in the LAS group during the pre-landing and jump phases in ankle and hip joints compared with the control group. Conclusion: The LAS group may adapt the environmental constraints by reducing the movement variability in ankle and hip joints. However, training programs focusing on recovery of ankle function should be emphasized after LAS because excessive pronation for prevention of LAS during the jump phase may result in reduced performance.
Statistical Parametric Mapping을 이용한 시상면에서의 양발 착지와 외발 착지의 전략 차이
( Sunghe Ha ),( Sang-kyoon Park ),( Sae Yong Lee ) 한국운동역학회 2019 한국운동역학회지 Vol.29 No.4
Objective: The purpose of this study was to investigate differences of shock attenuation strategies between double-leg and single-leg landing on sagittal plane using statistical parametric mapping. Method: Nine healthy female professional soccer players (age: 24.0±2.5 yrs, height: 164.9±3.3 cm, weight: 55.7±6.6 kg, career: 11.2±1.4 yrs) were participated in this study. The subjects performed 10 times of double-leg and single-leg landing from the box of 30 cm height onto force plates respectively. The ground reaction force, angle, moment, angular velocity, and power of the ankle, knee, and hip joint on sagittal plane was calculated from initial contact to maximum knee flexion during landing phase. Statistical parametric mapping was used to compare the biomechanical variables of double-leg and single-leg landing of the dominant leg throughout the landing phase. Each mean difference of variables was analyzed using a paired t-test and alpha level was set to 0.05. Results: For the biomechanical variables, significantly increased vertical ground reaction force, plantarflexion moment of the ankle joint, negative ankle joint power and extension moment of the hip joint were found in single-leg landing compared to double-leg landing (p<.05). In addition, the flexion angle and angular velocity of the knee and hip joint in double-leg landing were observed significantly greater than single-leg landing, respectively (p<.05). Conclusion: These findings suggested that negative joint power and plantarflexion moment of the ankle joint can contribute to shock absorption during single-leg landing and may be the factors for preventing the musculoskeletal injuries of the lower extremity by an external force.
Sunghe Ha,Sihyun Ryu,Ho Jong Gil 대한인간공학회 2020 大韓人間工學會誌 Vol.39 No.2
Objective: The purpose of this study is to examine the relation between the mechanical properties of midsole and stabilization strategies for lower extremity during running. Background: Since stabilization strategies for a human body are to be adjusted according to the mechanical properties of the shoes, such properties of shoes that a runner wears need to be taken into consideration. Method: Mechanical characteristics regarding the midsole cushioning properties (thickness [mm], dwell time [ms], peak acceleration [g], and energy return [%]) of each shoe were investigated by means of an impact tester. Twelve-male participated in the biomechanical experiment. They wore 12 different shoes and ran on the treadmill. To examine the relation between the mechanical properties of midsole and biomechanical variables during running, Pearson"s correlation coefficient was referenced. Results: It turned out that the shoe thickness, dwell time, and peak acceleration were in correlation with one another. During running, the initial maximum vertical ground reaction force (GRF), the Initial peak time of vertical GRF, the loading rate, the cross timing of the braking and propulsion were in correlation with mechanical properties of midsole. The inversion-eversion angle of the ankle joint at the moment of toe off was in correlation with the thickness. The internal rotation-external rotation angle of the knee joint at heel contact was in correlation with the dwell time. Conclusion: While the thickness and dwell time of midsole play positive roles in reducing shock on a human body, there is a significant possibility that they affect the stabilization of the joint of the lower extremity negatively. Application: Midsole thickness and dwell time may reduce the impact on the lower extremity.
Examining the Causal Relationships among the Four Sub
Sungh Yup Hyun,Jae Kyoon Jun,Hyun Joo Jung 한국호텔외식관광경영학회 2010 호텔경영학연구 Vol.19 No.5
With the evolution of relationship marketing, the concept of customer lifetime value (CLV) has been emerged and discussed importantly. The purpose of this research was to examine the causal relationships among the four sub-dimensions of customer lifetime value in the chain restaurant industry. Based on literature review, theoretical relationships among the four sub-dimensions of CLV were derived and six hypotheses were proposed. To test the proposed theoretical relationships, data was collected from 371 chain restaurant patrons. According to the data analysis, it was concluded that the four sub-dimensions of CLV were highly interrelated, and they play significant role in maximizing CLV. Specifically, customer acquisition not only influences customer retention, but also influences customer relationship expansion and customer defection. Therefore, customer acquisition strategies should receive more attention from the perspective of chain restaurant company`s long-term success. Also, the mediating role of customer relationship expansion was found in the CLV formation process. Based on data analysis, theoretical/empirical implications were discussed.