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조용한 문화시설을 이용하는 투렛 증후군 환자를 위한 음성 틱 음량감소 마스크 개발
허승원(Seungwon Hur),윤민호(Minho Yoon),이주영(Juyoung Lee),김규리(Gyuri Kim),신승원(Seungwon Shin),임덕신(Dokshin Lim) 대한기계학회 2021 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.9 No.2
투렛 증후군 환자는 음성 틱을 자신의 의지와 상관없이 내기에 문화시설 이용이 힘들다. 본 연구에서는 그들만을 위한 생활보조 기구가 없는 상황에서 문화생활이라도 편하게 즐기도록 음성 틱 음량감소 마스크를 제작했다. 다공성 폴리에스터와 공기층을 이용한 방음구조를 설계, 문화시설 이용객 간의 평균 거리를 고려해서 타인이 음성 틱의 소리를 듣지 못하는 음압 수준으로 약해짐을 목표로 했다. 추가적으로 틱 증상의 전조 감각을 활용한 사운드 마스킹 기능을 적용했다. 음성 틱 음량감소 마스크로 투렛 증후군 환자의 문화적 소외감 해소, 사회성 향상, 삶의 질 향상을 기대한다. 음성 틱을 향한 부정적인 시선과 반응을 차단하고 원만한 문화생활을 가능하게 함으로써, 환자들이 본인의 장애를 스스로 극복할 기회를 제공하고자 한다. Patients with Tourette"s syndrome have difficulty using cultural facilities because they make vocal-tic regardless of their will. So we have created the supporting device named "vocal-tic volume reduction mask" to help them enjoy cultural life. We designed sound absorption structure using porous polyester and air layer. The goal was to attenuate the SPL at which others couldn"t hear the bursting sound. Additionally, we applied sound masking function that utilizes a premonitory urge of tics. With the mask, we expect to relieve the cultural alienation, to improve their sociability. Thus, patients could get the opportunity to overcome their disabilities.
Study on Embryo Transfer System for Production of Transgenic Pigs
Seungwon Na,Euncheol Lee,Ghangyong Kim,Kyuhong Min,Youngkwang Yu,Pantu Kumar Roy,Xun Fang,Bahia Mohamed Salih Hassan,Kiyoung Yoon,Sangtae Shin,조종기 사단법인 한국동물생명공학회 2015 한국동물생명공학회지 Vol.30 No.4
In the last 10 years, porcine somatic cell nuclear transfer to generate transgenic pig has been performed tremendous development with introduction and knockout of many genes. However, efficiency of porcine somatic cell nuclear transfer is still low and embryo transfer (ET) is one of important step for production efficiency. In porcine ET for production of transgenic cloned pig, we can consider many of points to increase production rates. In respect of seasonality and weather, porcine ET usually is not performed in summer and winter. Cloned transgenic embryos must be transferred into reproductive tracts of recipients where embryos are located after natural fertilization with similar estrous cycle. If cloned embryos with 2∼4 cell stage are transferred, they must be transferred into oviducts in periovulatory stage. Number and deposition sites of transferred cloned embryos are important. And we must compare the methods of ET between surgical and non-surgical ones in respect of production efficiency. Sow recipients after natural estrus is most preferred recipients however its cost is must be considered. Here we will review many of current studies about porcine embryo transfer to increase production efficiency of transgenic pigs and strategies for further studies.
Flow Wars: Systemizing the Attack Surface and Defenses in Software-Defined Networks
Yoon, Changhoon,Lee, Seungsoo,Kang, Heedo,Park, Taejune,Shin, Seungwon,Yegneswaran, Vinod,Porras, Phillip,Gu, Guofei Institute of Electrical and Electronics Engineers, 2017 IEEE/ACM transactions on networking Vol.25 No.6
<P>Emerging software defined network (SDN) stacks have introduced an entirely new attack surface that is exploitable from a wide range of launch points. Through an analysis of the various attack strategies reported in prior work, and through our own efforts to enumerate new and variant attack strategies, we have gained two insights. First, we observe that different SDN controller implementations, developed independently by different groups, seem to manifest common sets of pitfalls and design weakness that enable the extensive set of attacks compiled in this paper. Second, through a principled exploration of the underlying design and implementation weaknesses that enables these attacks, we introduce a taxonomy to offer insight into the common pitfalls that enable SDN stacks to be broken or destabilized when fielded within hostile computing environments. This paper first captures our understanding of the SDN attack surface through a comprehensive survey of existing SDN attack studies, which we extend by enumerating 12 new vectors for SDN abuse. We then organize these vulnerabilities within the well-known confidentiality, integrity, and availability model, assess the severity of these attacks by replicating them in a physical SDN testbed, and evaluate them against three popular SDN controllers. We also evaluate the impact of these attacks against published SDN defense solutions. Finally, we abstract our findings to offer the research and development communities with a deeper understanding of the common design and implementation pitfalls that are enabling the abuse of SDN networks.</P>
Study on Embryo Transfer System for Production of Transgenic Pigs
Seungwon Na,Euncheol Lee,Ghangyong Kim,Kyuhong Min,Youngkwang Yu,Pantu Kumar Roy,Xun Fang,Bahia Mohamed Salih Hassan,Kiyoung Yoon,Sangtae Shin,Jongki Cho 한국수정란이식학회 2015 한국동물생명공학회지 Vol.30 No.4
In the last 10 years, porcine somatic cell nuclear transfer to generate transgenic pig has been performed tremendous development with introduction and knockout of many genes. However, efficiency of porcine somatic cell nuclear transfer is still low and embryo transfer (ET) is one of important step for production efficiency. In porcine ET for production of transgenic cloned pig, we can consider many of points to increase production rates. In respect of seasonality and weather, porcine ET usually is not performed in summer and winter. Cloned transgenic embryos must be transferred into reproductive tracts of recipients where embryos are located after natural fertilization with similar estrous cycle. If cloned embryos with 2∼4 cell stage are transferred, they must be transferred into oviducts in periovulatory stage. Number and deposition sites of transferred cloned embryos are important. And we must compare the methods of ET between surgical and non-surgical ones in respect of production efficiency. Sow recipients after natural estrus is most preferred recipients however its cost is must be considered. Here we will review many of current studies about porcine embryo transfer to increase production efficiency of transgenic pigs and strategies for further studies.
Numerical investigation of interaction between rising bubbles in a viscous liquid
Ikroh Yoon,Seungwon Shin 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.7
The rising behavior of bubbles undergoing bubble-bubble interaction in a viscous liquid is studied using a two-dimensional direct numerical simulation. Level contour reconstruction method (LCRM), one of the connectivity-free front tracking methods, is applied to describe a moving interface accurately under highly deformable conditions. This work focuses on the effects of bubble size on the interaction of two bubbles rising side-by-side in a stagnant liquid. Several characteristics of bubble-bubble interaction are analyzed quantitatively as supported by energy analysis. The results showed clear differences between small and large bubbles with respect to their interaction behavior in terms of lateral movement, vortex intensity, suppression of surface deformation, and viscous dissipation rate. Distributions of vorticity and viscous dissipation rate near the bubble interfaces also differed depending on the size of the bubbles. Strong vortices from large bubbles triggered oscillation in bubble-bubble interaction and played a dominant role in the interaction process as the size of bubbles increases.