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Investigating the response of zinc oxide nanoparticles on blood cells in vivo and in vitro
A Young Jung,Ji Young Bae,Seon Yeong Park,Dang-Young Kim,Saet Byul Cho,Ji Hyun Yun,Joo Hyun Jee,Hye Kyung Choi,Jun-Young Yang,Ji Hyun Seok,Seung Tae Chung,Hang Sik Roh,Wan-Seob Cho,Won Kuen Seong,Jayo 한국실험동물학회 2014 한국실험동물학회 학술발표대회 논문집 Vol.2014 No.8
On the monitoring of the technological opportunities using patent information
Youngjung Geum,Jeonghwan Jeon,Hyeonju Seol 대한산업공학회 2010 대한산업공학회 춘계학술대회논문집 Vol.2010 No.6
Responding to the needs for objective and data-driven method for technology monitoring, this study provides the systematic method to identify the technological opportunities using the novelty detection technique. Employing the novelty detection, this paper provides the objective evidences for new technological opportunities by identifying the novel data as well as novel attribute. This paper comprises of four main parts. Firstly, as a preliminary step, patent information is collected and preprocessed. Secondly, a patent-keyword matrix is constructed based on text mining technique. Following on the keyword matrix, clustering analysis is conducted to identify the current technological trend. As the final step, a novelty detection technique is applied to identify the technological opportunities. A case study for laser lithography technology is conducted to illustrate the working of proposed approach.
Fast Domain Decomposition for Global Image Smoothing
Youngjung Kim,Dongbo Min,Bumsub Ham,Kwanghoon Sohn IEEE 2017 IEEE TRANSACTIONS ON IMAGE PROCESSING - Vol.26 No.8
<P>Edge-preserving smoothing (EPS) can be formulated as minimizing an objective function that consists of data and regularization terms. At the price of high-computational cost, this global EPS approach is more robust and versatile than a local one that typically has a form of weighted averaging. In this paper, we introduce an efficient decomposition-based method for global EPS that minimizes the objective function of L-2 data and (possibly non-smooth and non-convex) regularization terms in linear time. Different from previous decomposition-based methods, which require solving a large linear system, our approach solves an equivalent constrained optimization problem, resulting in a sequence of 1-D sub-problems. This enables applying fast linear time solver for weighted-least squares and -L-1 smoothing problems. An alternating direction method of multipliers algorithm is adopted to guarantee fast convergence. Our method is fully parallelizable, and its runtime is even comparable to the state-of-the-art local EPS approaches. We also propose a family of fast majorization-minimization algorithms that minimize an objective with non-convex regularization terms. Experimental results demonstrate the effectiveness and flexibility of our approach in a range of image processing and computational photography applications.</P>
A mobile phone guide: spatial, personal, and social experience for cultural heritage
Youngjung Suh,Choonsung Shin,Woontack Woo IEEE 2009 IEEE transactions on consumer electronics Vol.55 No.4
<P>We have built a mobile phone-based guide system to strengthen the user experience in a cultural heritage site by supporting spatial awareness, personalization, and social connectedness. Our mobile phone guide implemented on a Java-enabled mobile phone provides both audio and visual content that is tailored by tracking user movement with GPS, collecting various user inputs and demographics, and allowing for socially acceptable eavesdropping via wireless networking. We applied our system to a cemetery site and present the results of a user study. We also conducted a performance evaluation to verify the effectiveness of both content filtering in personalization and content synchronization in social connectedness. Spatially, our results validated that our system provided a satisfying physical exploration of historic space. With respect to personalization, the content presented to visitors was well tailored to their real-time feedback over the course of their visit. Socially, the effectiveness of our sharing interface motivated visitors to frequently synchronize content among themselves. Our system will hopefully broaden the appeal of mobile phones as electronic tour guides providing adequate support for spatial awareness, personalization, and shared group experiences.</P>
On the monitoring of the technological opportunities using patent information
Youngjung Geum,Jeonghwan Jeon,Hyeonju Seol 한국경영과학회 2010 한국경영과학회 학술대회논문집 Vol.2010 No.6
Responding to the needs for objective and data-driven method for technology monitoring, this study provides the systematic method to identify the technological opportunities using the novelty detection technique. Employing the novelty detection, this paper provides the objective evidences for new technological opportunities by identifying the novel data as well as novel attribute. This paper comprises of four main parts. Firstly, as a preliminary step, patent information is collected and preprocessed. Secondly, a patent-keyword matrix is constructed based on text mining technique. Following on the keyword matrix, clustering analysis is conducted to identify the current technological trend. As the final step, a novelty detection technique is applied to identify the technological opportunities. A case study for laser lithography technology is conducted to illustrate the working of proposed approach.
소형민수헬기 주로터 풍동시험을 위한 마하 스케일 블레이드 설계
기영중(YoungJung Kee),박중용(JoongYong Park) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.2
본 연구에서는 소형민수헬기(Light Civil Helicopter, LCH)의 풍동시험에 필요한 축소 로터블레이드에 대해 내부 구조설계와 동특성 및 하중해석을 수행하였다. 축소로터 풍동시험은 로터 시스템의 공력성능과 소음 특성을 평가하기 위해 수행되므로, 실제 크기의 로터시스템과 동일한 공력 특성을 모사할 수 있도록 축소 블레이드 설계 시 마하 스케일(Mach-scale) 기법을 적용하였다. 마하 스케일 블레이드는 실물 블레이드의 끝단속도(blade tip speed)와 동일한 값을 유지할 수 있도록 로터의 회전속도를 증가시켜야 하며, 블레이드 중량, 단면강성 및 고유진동수 등은 특정한 축소계수(λ, scaling factor)를 통해 조정된다. 블레이드 내부의 주요 구성품인 스킨, 스파, 토션박스 등을 설계하기 위해 탄소섬유와 유리섬유 계열의 복합소재를 적용하였으며, 국내에서 수급이 가능한 프리프레그(prepreg) 형태의 복합소재를 적용하였다. 내부구조 설계가 완료된 블레이드에 대해 단면강성을 평가하기 위해 KSec2D 프로그램을 사용하였으며, 회전익 항공기의 통합해석 프로그램인 CAMRADII를 이용하여 축소 블레이드의 하중 분포와 동역학적 특성을 검토하였다. In this study, the internal structural design, dynamic characteristics and load analyses of the small scaled rotor blade required for LCH(Light Civil Helicopter) main rotor wind tunnel test were carried out. The test is performed to evaluate the aerodynamic performance and noise characteristics of the LCH main rotor system. Therefore, the Mach-scale technique was appled to design the small scaled blade to simulate the equivalent aerodynamic characteristics as the full scale rotor system. It is necessary to increase the rotor speed to maintain the same blade tip speed as the full scale blade. In addition, the blade weight, section stiffness, and natural frequency were scaled according to the Mach-type scaling factor(λ). For the design of skin, spar, torsion box, which are the main components of the blade, carbon and glass fiber composite materials were adopted, and composite materials are prepreg types that can be supplied domestically. The KSec2D program was used to evaluate the section stiffness of the blade. Also, structural loads and dynamic characteristics of the Mach scale blade were investigated through the comprehensive rotorcraft analysis program CAMRADII.