• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.26 no.1
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• pp.93-100
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• 2008

The parameters of lens such as focal length, focus, and aperture stop changes while shooting the scenes with zoom lens. Especially, zooming action dramatically changes the geometry of lens system that causes significant change of lens model. We investigated how the lens model changes while zooming in general shooting condition. Each parameters of lens model was estimated and checked whether they can be modeled well in the condition of auto-controlling focus, aperture and vibration reduction. In order to do this, calibration images were taken, modeled in different fecal length setting. And changing patterns of models were inspected to find out if there is some elements that have some particular pattern in changing with respect to focal length. The result showed us that although we didn't control the focus and aperture setting, there's specific changing patterns in radial and do-centering distortion. Especially, the strong linear correlation was found between coefficient of $r^2$ and focal length. It is expected that many parts of distortion can be eliminated without additional self calibration even if zoom operation is done when shooting the scenes if we know its fecal length and model of this coefficient.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.1478-1479
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• 2008

본 논문에서는 PDMS 프레폴리머의 전기유체분사를 이용하여 마이크로렌즈를 제작했다. 전기유체분사 시스템에서 인가전압과 기판 온도의 두 가지 변수를 변화시키면서 제작한 PDMS 마이크로렌즈의 특징을 파악하였으며, 인가전압이 증가함에 따라 마이크로렌즈의 직경이 작아지고, 기판 온도가 증가함에 따라 마이크로렌즈의 직경이 작아지고 접촉각이 커지는 것을 확인하였다. 제작된 PDMS 마이크로렌즈의 특성을 평가하기 위하여 가우시안 빔 투과 실험을 하였다. 측정된 초점거리는 계산된 초점거리와 5 mm 차이가 났으며, 렌즈를 투과된 가우시안 빔은 초점에서 최대의 파워밀도와 최소의 유효반경을 가지는 것으로 측정되었다.

• 한국벤처창업학회:학술대회논문집
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• 2023.04a
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• pp.117-122
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• 2023

벤처창업 연구에서 기업가적 리더십은 구성원의 혁신행동 및 성과를 증진시킬 수 있는 핵심 고리로 그 중요성을 인정받고 있다. 선행연구에서 기업가적 리더십은 구성원의 혁신행동을 향상시키는 요인으로 고려되고 있지만 아직까지 구성원의 개별 성향과 복합적으로 고려했을때 기업가적 리더십이 어떤 영향을 미치는지에 대해서는 연구가 부족한 편이다. 본 연구는 구성원의 조절 초점 성향을 토대로 기업가적 리더십이 구성원의 성향에 따라 자기효능감과 혁신행동에 각기 다른 영향을 미칠 것으로 가정, 연구를 진행하였다. 본 연구는 변수 간 인과관계 검정을 위해 중소벤처기업에 재직 중인 구성원을 대상으로 점화 기법 기반 실험연구를 진행할 예정이다. 실험연구를 통해 본 연구는 리더의 기업가적 리더십이 구성원의 혁신행동을 어떻게 높일 수 있는지에 대한 단초를 제공할 것이다. 또한, 본 연구결과는 벤처기업 및 스타트업에서 구성원의 혁신행동을 촉진할 수 있는 조직운영 프로세스에 관한 시사점과 함께 학문 및 실무적 관점에서도 의미 있는 기여도를 제공할 예정이다.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.11 no.2
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• pp.1-8
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• 2016

Self Regulatory Focus Theory explained two different self-regulatory systems(promotion focus and prevention focus) to achieve a goal. According to this theory, people have different type of goal(approach pleasure and avoid pain) and use different type of strategy to achieve the goal. Promotion focus targets their attention to positive outcomes and the achievement of gains. On the other hand, prevention focus targets attention more to negative outcomes and the avoidance of losses. Also, promotion focus tends to use approach and eager strategy to achieve the goal and prevention focus tends to use avoidance and vigilant strategy. This study examined the effects of self regulation focus on attitude and intention toward business start-up. We proposed that promotion focused people will respond more positively to the attitude and intention toward business start-up than prevention focused people. This likely because promotion focused people tend to focus more ideals and gains, where prevention focused people tend to focus more safety and risk. And also we proposed that these effect will be influenced by psychological distance. This study investigated these relationships using 186 under graduate students. The result of analysis indicated that promotion focused people responded more positively on the intention toward business start-up than prevention focused people. But it had not any effect on the attitude toward business start-up than prevention focused people. Self regulation focus and psychological distance turns out to be a significant factors that influence attitude and intention toward business start-up. Finally, we concluded with a discussion of the implications of the research findings and directions for future research.

• The KIPS Transactions:PartB
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• v.19B no.4
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• pp.231-236
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• 2012

According to consumer behavior theory, human propensity can be divided into two regulatory focus types: promotion and prevention. These two types have much influence on the consumer's decision in many diverse areas. In this research, we apply regulatory focus theory to personalized recommendation to minimize the cold start problem and to improve the performance of recommendation algorithms. To achieve this goal, we extract the consumer behavior variables and information exploration activity index from web shopping logs. We then use them for classifying regulatory focus of the consumer. This research has the contribution to show the possibility of systematization of consumer behavior theory as an interdisciplinary research tool of social science and information technology. Based on this attempt, we will extend the research to IT services adapting theories on other areas.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.6 no.4
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• pp.75-94
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• 2011

Our objective is to investigate the various variables that influence the purchase intention of small enterprise products and to interpret the impact of these variables in terms of individual differences. Need for cognition, need for uniqueness, and self-regulation are selected to explain the choice or purchase intention. The major reasons that consumers are reluctant to purchase small enterprise products are mainly due to problems in quality and distribution channel. When these problems are resolved, it is interesting to see how the individual differences affect purchase intention for small enterprise products and how the impacts will be changed. Previous studies assumed uni-dimensionality of need for cognition and need for uniqueness. We relaxed the assumption, incorporated the nature of multi-dimensionalities for these variables and showed that sub-dimensions of these variables have different effects on the purchase intention. After improving the conditions of quality or distribution channel, promotion focus and prevention focus for sub-dimensions of self-regulation have positive impacts on the purchase intention and sub-dimensions of need for cognition and need for uniqueness have enhancing or reducing effects on purchase intention. These results can be interpreted that consumers expect some levels of quality or distribution channel to reach consumer choice. Results for cluster analysis showed that how sub-dimensionalities of individual difference variables are combined to form groups and how these groups are related to purchase intention. Emphasis of quality over price has a negative correlation with purchase intention of small enterprise products.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.44 no.3 s.357
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• pp.12-19
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• 2007

This paper proposes the enhanced auto-focus algorithm detecting several objects and selecting the target object. Proposed algorithm first detects some objects distributed in the image using focus measure operator and multi-window and then selects the target object through fuzzy reasoning with three fuzzy membership functions. Implementation can be simple because it only needs image sensor instead of infrared or ultrasonic equipment. Experimental result shows that the proposed algorithm can improve the quality of image by focusing to the target object.

• Proceedings of the Korea Multimedia Society Conference
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• 2000.04a
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• pp.137-140
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• 2000

카메라의 렌즈 등 광학장비의 성능 제한으로 인하여 초점이 맞지 않아 흐려지고 잡음으로 훼손된 영상을 복원하는데 일반적으로 반복복원방법이 사용된다. 이 경우에 가속변수는 훼손영상에 관계없이 영상전체에 일률적으로 적용되기 때문에 흐려짐 훼손이 심한 윤곽부분도 훼손이 작은 평면영역이 같이 일정하게 처리되어 수렴속도가 느려지고 시각적으로 중요한 윤곽부분의 복원에는 효율적이지 못하다. 이러한 문제점을 해결하기 위하여 본 논문에서는 흐려짐 훼손이 작은 평면영역은 가속변수를 작게하고 훼손이 큰 윤곽영역은 가속변수를 크게 하여 영상의 국부적인 특성에 따라 적응적으로 반복 복원하는 방법을 제안하였다. 제안한 복원방법은 기존의 방법과 비교하여 수렴속도가 빨라지고 시각적으로 중요한 윤곽정보의 복원에도 효율적임을 실험결과를 통해 할 수 있었으며, MSE면에서도 우수하였다.

• Management & Information Systems Review
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• v.32 no.3
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• pp.127-151
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• 2013

This research was to investigate the role of message regulatory focus on the advertising effect of multiple models. The multiple models are limited to two models in one advertisement in this research. This research investigated the hypothesis that multiple models, in terms of multiple source effect and social consensus, appears specifically to enhance the relationship of consumer and commercial models on the conditions of promotion-focused message which leads to the information processing of relational elaboration. This research applied a between-subjects factorial design targeting 2(the number of model: single model vs. multiple models) by 2(message regulatory focus: promotion-focused message vs. prevention-focused message). As a result, multiple models showed more positive ad attitude, brand attitude, and purchase intention than did single model. And promotion-focused message with multiple models showed more positive ad attitude, brand attitude, and purchase intention than did prevention-focused message with multiple models. Also there was an interaction effect between the number of model and the type of message regulatory focus. It wasn't fully supported that there is no difference of advertising effect between promotion-focused message and prevention-focused message on the condition of single model.

• Journal of the Korean Magnetics Society
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• v.25 no.2
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• pp.52-57
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• 2015

The focal spot of electron beam depending on the anode angle in the structure and major parts of the X-ray tube was investigated by the OPERA-3D/SCALAR simulation program. The simulation worked on four spaces with with two spaces, including anode and cathode of X-ray tube, by applying the finite element method analysis. The analytical model and dimension for the emission orbit of thermal electrons made from one filament of the focused X-ray cathode is affected to the penumbra of detector for the X-ray depending on any real focal spot size. The model shape of focusing cap and focusing tube with an anode target angle and a cathode filament is analyzed by the current density distribution of thermal electrons. The focusing width of thermal electrons for the X-ray tube depended on the anode angle (${\theta}$). The focusing value of electron beams at a region of anode angle having $10^{\circ}{\sim}17^{\circ}$ maintained to below value of $70{\mu}m$. The minimum focal size of the electron beam was $40{\mu}m$ at an anode angle of $15^{\circ}$. The focused X-ray tube of many variables depended on the thermionic emission of hot electrons from the target trajectory. The focusing tube will contribute to the real design of X-ray for the development of future diagnosis medical device.