• Title/Summary/Keyword: 롤 모델

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A Study on the Effects of Role Models on Differences in Entrepreneurs' Characteristics (롤 모델의 창업자 특성차이에 대한 영향에 관한 연구)

  • Joo-Heon Lee
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.18 no.2
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    • pp.53-66
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    • 2023
  • Role models are also known to influence an individual's job or career choice. The positive effect of role models on entrepreneurship has already been revealed through many precious researches. It is said that people choose not only family members who are related by blood, such as parents, siblings, and relatives, but also acquaintances whom they have met through social relationships as role models. In this study, we divided into entrepreneurs with no role models other than themselves and entrepreneurs with role models. In addition, we classified parental siblings and relative role models as role models with strong ties, and acquaintance role models as role models with weak ties. We analyzed the differences in personal attributes, entrepreneurial orientation factors, and learning orientation between the entrepreneurs with role models and those without role models. Also, the differences in personal attributes, innovativeness, proactiveness, risk-taking propensity, and learning orientation between the entrepreneurs with strong ties role models and those with weak ties role models were examined. The empirical analysis results are as follows. First, it was found that the proportion of women entrepreneurs without role models is higher. Second, the entrepreneurs with role models with weak ties tend to run larger scale start-ups. Third, it was found that the entrepreneurs with role models of weak ties tend to have higher learning orientation. Fourth, gender shows the greatest influence on th absence or presence of role models. Fifth, it was found that learning orientation and startup size have the greatest influence on the decision of the role model with weak ties or that with strong ties.

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Analytical and Numerical Investigation of Horizontal Force and Stable Position of Work Roll in Backup-Roll-Drive 4-High Cold-Rolling Mill (보강롤 구동 4 단 냉간압연기에서 작업롤의 수평하중 거동분석과 안정위치 결정을 위한 해석적 및 수치적 고찰)

  • Byon, Sang-Min;Lee, Jae-Hyeon;Park, Heung-Sik
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.9
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    • pp.977-982
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    • 2011
  • The horizontal force acting on a work roll was examined. This force results from the contact force between the work roll and backup roll in a backup-roll-drive 4-high cold-rolling mill. This horizontal force bends the work roll horizontally and therefore exerts reciprocal action on the roll-gap contour. An analytical model for predicting the horizontal force acting on a work roll, which generates a mean value in the steady state, was presented. The material used for the analysis was high-silicon steel (about 3% Si). A three-dimensional finite element (FE) model was also employed to investigate the non-steady-state behavior of the horizontal force. Results showed that the horizontal force varied with the off-center distance between the work roll and backup roll. In addition, the optimal off-center distance was determined to minimize the horizontal force.

Study on Model Based Control for the Roll Motion of an Underwater Robot (수중로봇의 롤 운동제어를 위한 모델 베이스 제어에 관한연구)

  • Kim, Chi-Hyo;Park, Woo-Kun;Kim, Tae-Sung;Lee, Min-Ki
    • Journal of Navigation and Port Research
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    • v.33 no.5
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    • pp.323-330
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    • 2009
  • We have been developing an underwater robot for harbour construction using a parallel mechanism The robot is attached to the rope of a crane, which curries a large stone into the undersea The robot's yaw and pitch are controlled by hydraulic cylinders but its roll is uncontrollable. We mount propellers in both side of the robot to generate the roll motion This paper studies on the control for the roll motion of a underwater robot. A gyro-sensor is used to measure the angle in a roll motion We develop the dynamic model to describe the robot's roll motion by a second order non-linear system and identify the model parameters by recursive least square and adaptive identifier. PD control, recursive model based control and adaptive model based control are applied with the dynamic model which computes the control input to compensate disturbances. This paper introduces the underwater robot system and presents the simulated and experimental results of the proposed controller.

Comparison of CNN and GAN-based Deep Learning Models for Ground Roll Suppression (그라운드-롤 제거를 위한 CNN과 GAN 기반 딥러닝 모델 비교 분석)

  • Sangin Cho;Sukjoon Pyun
    • Geophysics and Geophysical Exploration
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    • v.26 no.2
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    • pp.37-51
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    • 2023
  • The ground roll is the most common coherent noise in land seismic data and has an amplitude much larger than the reflection event we usually want to obtain. Therefore, ground roll suppression is a crucial step in seismic data processing. Several techniques, such as f-k filtering and curvelet transform, have been developed to suppress the ground roll. However, the existing methods still require improvements in suppression performance and efficiency. Various studies on the suppression of ground roll in seismic data have recently been conducted using deep learning methods developed for image processing. In this paper, we introduce three models (DnCNN (De-noiseCNN), pix2pix, and CycleGAN), based on convolutional neural network (CNN) or conditional generative adversarial network (cGAN), for ground roll suppression and explain them in detail through numerical examples. Common shot gathers from the same field were divided into training and test datasets to compare the algorithms. We trained the models using the training data and evaluated their performances using the test data. When training these models with field data, ground roll removed data are required; therefore, the ground roll is suppressed by f-k filtering and used as the ground-truth data. To evaluate the performance of the deep learning models and compare the training results, we utilized quantitative indicators such as the correlation coefficient and structural similarity index measure (SSIM) based on the similarity to the ground-truth data. The DnCNN model exhibited the best performance, and we confirmed that other models could also be applied to suppress the ground roll.

A Study on the Measurement of Dynamic Stability Derivatives in the Rolling Motion of Aircraft (항공기의 롤운동 동안정미계수 측정에 관한 연구)

  • Cho, Hwan-Kee
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.21 no.4
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    • pp.41-46
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    • 2013
  • This paper deals with an experimental technique for the measurement of dynamic stability derivatives in the roll motion of aircraft. Experimental aquisition method for aircraft's dynamic stability derivatives is conducted on the oscillation condition of aircraft model in the subsonic wind tunnel. The oscillation of aircraft model was forced by the oscillation apparatus. The forced oscillation technique is the method getting data from the internal balance inserted into the aircraft model during oscillating it. Dynamic stability derivatives of rolling motion were calculated by data reduction from the measurements of rolling moment, frequency and amplitude of aircraft model due to forced oscillation under wind conditions. Results of experiment is obtained similar one with those of roll dynamic stability derivatives measured in other institutes.

Influence of Indirect Experiences and Role Models on Entrepreneurial Intentions (간접 경험 및 롤 모델이 창업의지에 미치는 영향)

  • Chang, Soo-jin;Chung, Byoung-gyu
    • Journal of Venture Innovation
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    • v.5 no.2
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    • pp.35-48
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    • 2022
  • This study was conducted to analyze the effect on entrepreneurial intention and empirically analyze which factors have the greatest influence. To this end, self-achievement motivation, indirect experience, role model, awareness of entrepreneurs, and fear of business failure were set as independent variables as factors influencing entrepreneurial intention. In order to empirically analyze this, 399 valid samples for the general public were analyzed. SPSS 25.0 was used for statistical analysis. As a result of the empirical analysis of this study, self-achievement motivation, indirect experience, role model, awareness of entrepreneurs, and fear of business failure all had a positive and significant effect on entrepreneurial intention. The results of this study confirmed that self-achievement motivation had the greatest influence among the factors affecting entrepreneurial intention. It is significant in that indirect experiences and role models such as theoretical entrepreneurship lectures, special entrepreneurship lectures, and parents or acquaintances influence entrepreneurial intention.

Investigation of Unbalanced Mass of a Work Roll in a Cold Rolling Mill (냉간 압연기에서 작업롤의 질량 불평형에 관한 연구)

  • Kim, Young-Deuk;Kim, Chang-Wan;Park, Hyun-Chul
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.36 no.4
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    • pp.429-435
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    • 2012
  • An abrasion due to continuous friction between a work roll and strip causes the mass of the work roll to be unbalanced in the rolling process. We developed a mathematical model for the rolling mill considering the unbalanced mass and verified the model experimentally. The work roll was approximated as a rigid rotor with eccentricity, and the effect of the unbalanced mass on chatter vibration was investigated. The joint forces computed by quasistatic analysis were applied to the work roll in the rolling mill. Transient responses were obtained, and frequency analysis was performed by solving equations of motion using a direct integration method. Horizontal vibrations were more strongly affected by eccentricity than vertical vibrations. In the horizontal direction, a small eccentricity of 1% of the work roll radius considerably increased the amplitude of the chatter frequency.

The Implication of Bandura's Vicarious Reinforcement in Observational Learning for Christian Education (관찰학습에서의 반두라 대리강화에 대한 기독교교육적 함의)

  • Lee, Jongmin
    • Journal of Christian Education in Korea
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    • v.61
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    • pp.81-107
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    • 2020
  • This study reviews Bandura's vicarious reinforcement in observational learning process and implies this concept into Christian education in terms of spiritual role modeling. The first part of this study answers three questions: "what is vicarious reinforcement?" "how does vicarious reinforcement take place in observational learning?" and "how does vicarious reinforcement affect observer's behavior change?" Bandura conceptualizes the learning process with observational learning and imitative or non-imitative performance. Based on this concept, Bandura define the roles of vicarious reinforcement in the four steps of observational learning process: attention, retention, motor reproduction, and motivational process. Also, the three effects of vicarious reinforcements are explained in the following categories: the observational learning effect, inhibitory or disinhibitory effects, and eliciting effect. Adapting the structure of observational learning theory in terms of the effect of vicarious reinforcement and the function of role models, the second part of this study examines the biblical concept of imitation of Christ and the modeling strategy of discipleship. Especially Paul's spiritual role model serves as positive vicarious reinforcement for the Christian believers to perform the desired behaviors. Also, Paul's condemnation serves as explicit negative vicarious reinforcement. Then, the last part of this study covers the implication of these findings from observational learning and empirical studies in terms of spiritual role modeling to Christian education.

소통+섬기는 마음: 나눔 더하기 행복 - 해외의료봉사의 롤모델을 제시하는 가톨릭대 해외의료지원단

  • Choe, Yong-Gyun
    • 건강소식
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    • v.34 no.8
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    • pp.36-37
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    • 2010
  • 지난 5월 11일 한국국제보건의료재단(KOFIH)이 개최한 제1회 해외보건의료 우수사례 공모전에서 가톨릭대학교 성의교정 해외의료지원단이 대상의 수상을 차지했다. 가톨릭대 해외의료지원단은 2004년 3월부터 몽골 울란바토르에 설립한 상설 무료진료소 '성 메리 클리닉(St. Mary's Clinic)'을 운영하고 있는데 이는 해외의료봉사의 롤모델로 평가받고 있다. 가톨릭대 해외의료 지원단과 성 메리 클리닉을 만나본다.

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