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눈의 물리적인 특성과 유사한 펄 원료 개발 및 이를 이용한 화장료 조성물 제조방법
이윤하 ( Yunha Lee ),김경남 ( Kyung Nam Kim ),선우건 ( Gun Sunwoo ),( Norbert Rick ),( Antje Reichnek ),최영진 ( Yeongjin Choi ),고승용 ( Seungyong Ko ),한상훈 ( Sanghun Han ),강학희 ( Hakhee Kang ),이옥섭 ( Oksub Lee ) 대한화장품학회 2008 대한화장품학회지 Vol.34 No.3
화장품 분야에서 펄 안료는 다양하게 적용되어져 왔다. 지금까지 가장 대중적으로 사용된 펄 안료는 마이카 기재에 산화철이 코팅된 것이었지만, 최종 제품에 이와 같은 펄을 사용하게 될 경우 천연 마이카에 함유된 불순물로 인해 약간의 불투명한 노란 색상이 띄게 된다[1,2]. 본 연구는 눈과 같은 반짝임을 제공하는 펄 안료 개발에 초점을 맞췄고, 눈과 같은 효과는 펄 안료의 구조와 순도 등의 영향 때문인 것을 알게 되었다. 특히, 이번 펄 안료 개발은 유리 기재와 산화철을 코팅시켜 눈의 광학적인 값(refractive index)과 입자 크기(particle size)를 눈과 유사하게 개발하였고 이는 눈과 같이 화려한 반짝임(glittering) 효과를 구현할 수 있게 되었다. 그리고 메이크업 제품에 본 펄 안료를 적용하여 화려한 제품을 개발하게 되었다. Pearlescent pigments have been widely used in cosmetic applications. Up to date; the most widely used pearl effect pigment is the mica-based pigment, which uses natural mica as the substrate that is in turn coated with metal oxide interference layer. However, when natural mica is employed as a base material the final product often has a yellowish color, mainly due to the fact that natural mica contains low levels of iron as an impurity[1,2]. This study was focused on developing a pearl pigment which might have a similar sparkling effect as snow. This effect was found to be due to its structure and purity, and this concept was also applied to development of our pearl pigments. More specifically, this invented pearl effect pigments are the mixture of glass-flake and glass-flake coated metal oxides and present the optical properties of snow matrix such as refractive index and particle size, unlike only the glass-flake or glass-flake coated metal oxides to be applied in. Using base material having similar physical properties (refractive index and particle size) as snow matrix as platelet for pearl effect pigments, these invented pigments present a three-dimensional glittering effect of the snow matrix. With this invented pigments an applied; we achieved the beauty of snow crystal from makeup products containing these pigments.
고기술산업과 저기술산업의 제품혁신패턴 및 연구개발 결정요인 분석: Hurdle 모형과 Heckman 표본선택모형을 중심으로
이윤하(Yunha Lee),강승규(Kang, Seung-Gyu),박재민(Jaemin Park) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.10
그간 진화경제학적 관점에서 산업 고유의 특성에 따라 발생하는 기술혁신 패턴을 고찰하고자 하는 시도가 있어왔다. 본 연구는 국내 제조업을 기술집약도에 따라 고기술산업과 저기술산업으로 구분하고 제품혁신 패턴 및 혁신 성과 결정요인의 산업별 차이를 확인하였다. 기존 연구들은 연구개발 수행에 대한 기업의 의사결정 과정에서 연구개발을 수행하도록 만드는 결정요인을 분석에 반영하지 못했다는 지적이 있다. 본 연구에서는 이러한 문제를 극복하기 위해서 Heckman 표본선택모형과 허들모형을 대안으로 제시하고, 「2014년 중소기업기술통계조사」 자료의 1,637개 기업에 대해 분석을 실시했다. 분석 결과 제조업의 중소기업이 수행하는 제품혁신 패턴과 제품혁신 성과에 영향을 미치는 결정요인들에 있어 고기술산업과 저기술산업 간 뚜렷한 차이가 있다는 것을 확인 할 수 있었다. 또한, 기존 연구의 한계점을 극복하기 위해 채택한 연구모형의 확장을 통해서 중소기업 연구개발 수행에 대한 의사결정 과정에서 표본선택편의 문제와 허들로 표현되는 문지방이 있다는 것을 발견할 수 있었다. 본 연구는 산업별 제품혁신 패턴의 특징과 제품혁신 성과결정요인을 다각적으로 살펴보았고, 중소기업의 연구개발 수행에 대한 의사결정 과정을 더 깊이 이해할 수 있었다는 점에서 학술적 의의가 있다. There have been many studies to examine the patterns in innovations reflecting industry-specific characteristics from an evolutionary economics perspective. The purpose of this study is to identify industry-specific differences in product innovation patterns and determinants of innovation performance. For this, Korean manufacturing is classified into high-tech industries and low-tech industries according to technology intensity. It is also pointed out that existing research does not reflect the decision-making process of firms" R&D implementations. In order to solve this problem, this study presents a Heckman sample selection model and a double-hurdle model as alternatives, and analyzes data from 1,637 firms in the 2014 Survey on Technology of SMEs. As a result, it was confirmed that the determinants and patterns of manufacturing in small and medium-size enterprise (SME) product innovation are significantly different between high-tech and low-tech industries. Also, through an extended empirical model, we found that there exist a sample selection bias and a hurdle-like threshold in the decision-making process. In this study, the industry-specific features and patterns of product innovation are examined from a multi-sided perspective, and it is meaningful that the decision-making process for manufacturing SMEs" R&D performance can be better understood.
다중 UAV 협업을 위한 선형 분산 피동 표적추적 필터 설계
이윤하(Yunha Lee),김찬영(Chan-Young Kim),나원상(Won-Sang Ra),황익호(Ick-Ho Whang) 대한전기학회 2018 전기학회논문지 Vol.67 No.2
This paper proposes a linear distributed target tracking filter for multiple unmanned aerial vehicles(UAVs) sharing their passive sensor measurements through communication channels. Different from the conventional nonlinear filtering schemes, the distributed passive target tracking problem is newly formulated within the framework of a linear robust state estimation theory incorporated with a linear uncertain measurement equation including the coordinate transform uncertainty. To effectively cope with the performance degradation due to the coordinate transform uncertainty, a linear consistent robust Kalman filter(CRKF) theory is devised and applied for designing a distributed passive target tracking filter. Through the simulations for typical UAV surveillance mission, the superior performance of the proposed method over the existing schemes of distributed passive target tracking are demonstrated.
안면마비에 대한 SJS 무저항요법-안면마비(SJSNRT-F)를 포함한 복합한방치료 증례보고 3례
이윤하(Yunha Lee),채지원(Jiwon Chai),최동주(Dongjoo Choi),구승혁(Seunghyeok Ku),김성현(SungHyun Kim),문현우(Hyunwoo Moon) 척추신경추나의학회 2021 척추신경추나의학회지 Vol.16 No.2
Objectives This study aimed to investigate the effect of SJS non-resistance technique- facial palsy (SJSNRT-F) using Korean medicine treatment on facial nerve palsy through three case studies. Methods SJSNRT-F, with other Korean medicine treatments, was performed on three patients who underwent treatment at OO Korean Medicine Hospital from March 2021 to August 2021. Additionally, the House-Brackmann grading system (H-B grade) and Yanagihara s unweighted grading system (Yanagihara s score) were evaluated in these patients. Results There was a significant increase in the Yanagihara scores. Except for one patient who was discharged early, two patients showed improvement in the H-B grade. Conclusions This study suggests that Korean medicine treatment including SJSNRTF may affect the treatment of facial nerve palsy. However, better clinical studies are needed to confirm the same.
수중 자율이동체의 장시간 수중항법 성능 개선을 위한 표준 수력학 모델 기반 속도 추정필터 설계
이윤하(Yunha Lee),나원상(Won-Sang Ra),김광훈(Kwanghoon Kim),안명환(Myonghwan Ahn),이범직(Bum-Jik Lee) 대한전기학회 2016 전기학회논문지 Vol.65 No.11
This paper proposes a novel velocity estimator for long-term underwater navigation of autonomous underwater vehicles(AUVs). Provided that an external position fix is not given, a viable goal in designing a underwater navigation algorithm is to reduce the divergence rate of position error only using the sporadic velocity information obtained from Doppler velocity log(DVL). For such case, the performance of underwater navigation eventually depends on accuracy and reliability of external velocity information. This motivates us to devise a velocity estimator which can drastically enhance the navigation performance even when the DVL measurement is unavailable. Incorporating the Gertler-Hagen hydrodynamics model of an AUV with the measurement models of velocity and depth sensors, the velocity estimator design problem is resolved using the extended Kalman filter. Different from the existing methods in which an AUV simulator is regarded as a virtual sensor, our approach is less sensitive to the model uncertainty often encountered in practice. This is because our velocity filter estimates the simulator errors with sensor aids and furthermore compensates these errors based on the indirect feedforward manner. Through the simulations for typical AUV navigation scenarios, the effectiveness of the proposed scheme is demonstrated.
이행성 척추에 동반된 골수부종 환자의 복합한방치료: 증례보고
채지원 ( Jiwon Chai ),이윤하 ( Yunha Lee ),최동주 ( Dongjoo Choi ),안상준 ( Sang-joon An ),최현진 ( Hyunjin Choi ),황보승윤 ( Sengyoon Hwangbo ),백혜경 ( Hyekyung Baek ) 한방재활의학과학회 2022 한방재활의학과학회지 Vol.32 No.1
This study was to investigate the effectiveness of combined Korean medicine treatment on a patient who was diagnosed on lumbosacral transitional vertebra (LSTV) with localized bone marrow edema. The patient was treated with acupuncture, pharmacopucture, cupping and herbal medicine. We evaluated patient's progress using range of motion (ROM), EuroQol-5 dimensions (EQ-5D), Oswestry disability index (ODI), numerical rating scale (NRS), patient global impression of change, self-walkable distance. NRS of back pain decreased from 7 to 5, at the same time NRS of lower limb decreased from 4 to 3. EQ-5D score increased from 0.24 to 0.646. ODI score improved 80 to 62. Self-walkable distance and lumbar spine ROM also increased. As a result, clinical improvements were found in a patient. In conclusion, this study shows that Korean medicine treatment can be considered as effective conservative care for LSTV with localized bone marrow edema. (J Korean Med Rehabil 2022;32(1):125-131)
족관절 염좌에 따른 비골신경 신전 손상 환자에 대한 근에너지기법과 한의종합치료 병행 증례보고
류원형(Won-Hyung Ryu),김두리(Doo-Ri Kim),이지연(Jiyun Lee),이윤하(Yunha Lee),채지원(Jiwon Chai),정재현(Jai-Hyeon Chung),문희영(Hee-Young Moon),박지원(Ji-Won Park) 척추신경추나의학회 2019 척추신경추나의학회지 Vol.14 No.2
Objectives : The purpose of this study was to explore the effectiveness of Korean medicine treatment and the Muscle Energy Technique on foot drop through a case study with a patient with common peroneal neuropathy. Methods : A patient with severe foot drop after an ankle sprain was hospitalized and treated with acupuncture and traditional medicine and the Muscle Energy Technique. The effect of the treatment was evaluated with the Numeric Rate Scale(NRS), dorsiflexion angle evaluation, and the Manual Muscle Test (MMT). Results : The results of the NRS, dorsiflexion angle evaluation and MMT showed greatly improvementwith results changing from 8 to 2, 0 to 15, and Grade 2 to Grade 4, respectively. Conclusions : This study suggests that Korean medicine treatment and the Muscle Energy Technique could be effective treatments for foot drop with common peroneal neuropathy. However further clinical studies are needed to establish a definite conclusion.