데이터 마이닝 기반의인디음악 추천 서비스 플랫폼 개발

최재민,강인욱,김태윤,신준호,최재민,한지영 대한산업공학회 2015 대한산업공학회 추계학술대회논문집 Vol.2015 No.11

교반속도 변화에 따른 Ni-Mn계 산화물 합성 및 특성 연구

최재민,황윤주,장호생,최인형,남기석 한국에너지학회 2013 한국에너지공학회 학술발표회 Vol.2013 No.5

『천로역정』과 비국교도

최재민 21세기영어영문학회 2017 21세기영어영문학회 학술대회 Vol.2017 No.03

다양한 설계변수를 고려한 수직하중을 받는 일체형 임플랜트의 최적설계

최재민,전흥재,이수홍,한종현,Choi Jae-Min,Chun Heoung-Jae,Lee Soo-Hong,Han Chong-Hyun 대한치과보철학회 2006 대한치과보철학회지 Vol.44 No.2

Statement of problem: The researches on the influence of design variables on the stress distribution in cortical and trabecular bones and on optimal design for implant system were limited. Purpose: The purpose of this study is to identify the sensitivities of design parameters and to suggest the optimal parameters for designing the onebody type implant system. Material and methods: Stresses arising in the implant system were obtained by finite element analysis using a three dimensional model. An onebody type implant system[Oneplant (Warrantec. Co. Ltd., Korea)] was considered in this study. Vortical load(150 N) was applied on the top of the abutment along the axial direction. The initial design variables set for sensitivity analysis were radius of fixture, numbers of micro thread, numbers of power thread, height of micro thread, future length, tapered angle of future, inclined angle of thread, width of micro thread and width of power thread. The statistical technique of Design of Experiments(DOE) was applied tn the simulation model to deduce effective design parameters on stress distributions in bones. The deduced design parameters were incorporated into a fully automated design tool which is coupled with the finite element analysis and numerical optimization to determine the optimal design parameters. Results: 1. The result of sensitivity analysis showed six design variables - radius of future, tapered angle of fixture, inclined angle of thread, numbers of power thread, numbers of micro thread and height of micro thread - were more influential than the others. 2. The optimal values of design variables can be deduced by coupling finite element analysis (FEA) and design optimization tool(DOT).

아스팔트용 고강도 앵커시스템의 인발강도식 검토에 관한 기초적 연구

최재민,이승용,성기태,한영두 한국재난정보학회 2017 한국재난정보학회 논문집 Vol.13 No.3

In order to investigate the basic performance of the high strength anchor for asphalt road subjected to tensile load, the static pullout test was carried out and the pullout strength of the asphalt anchor was analyzed. In the pullout test, the depth of anchor, depth of pavement, diameter of anchor, type of anchor, experimental temperature, epoxy type and amount of anchor were used as test variables. As a result, the steel strength of asphalt anchor was 1.08 times higher than that of conventional anchor concrete, therefore it is considered appropriate to use the steel strength formula of concrete anchor for asphalt anchor. Compared with the proposed formula, the pullout load obtained from the test of the asphalt anchor was within ± 10%. The ratio of the projected area of the asphalt anchor is the similar as that of the concrete anchor. 인장하중을 받는 아스팔트 도로용 고강도 앵커의 강도특성에 관한 기초 성능을 규명하기 위해 앵커 매립깊이, 포장두께, 앵커 직경, 앵커 종류, 실험 온도, 에폭시 종류, 그룹인발 수량 등을 실험변수로 하여 정적 인발실험을 실시하고, 아스팔트 앵커의 인발강도에 대하여 분석을 실시하였다. 그 결과 아스팔트 앵커의 강재강도는 기존 콘크리트 앵커의 강재강도식을 적용하면 1.08배 이상의 안전율을 확보할 수 있으므로 콘크리트 앵커 강재강도식을 사용하여도 무관한 것으로 나타났다. 아스팔트 앵커의 실험을 통해 얻은 인발하중을 제안식과 비교하면 약 ±10% 이내의 오차로 근사치를 나타내고 있다. 이로부터 아스팔트 앵커의 경우에도 콘크리트 앵커와 동일한 투영면적의 비가 성립될 수 있을 것으로 판단된다.

강원지역 폐옥수수대로부터 바이오에탄올 생산을 위한 전처리 방법 개발

최재민,강세영,염승호 유기성자원학회 2011 유기물자원화 Vol.19 No.3

강원도에서 확보한 폐옥수수대는 글루칸 44.6 %, 자일란 23.8 %, 리그닌 23.8 %, 회분 4.5 %, 기타 8.1 %로 이루어져 있다. 묽은 황산을 이용한 전처리 공정을 통계적 방법인 완전요인배치으로 분석한 결과 온도가 가장 중요한 변수로 나타났으며 자일로스 수율 기준으로 처리 시간과 농도에 비해 각각 3.5배와 3.2배 큰 영향력을 보여주었다. 포도당 수율에 대해서도 온도의 영향력이 가장 큰 것으로 나타났지만 포도당 수율은 전체적으로 5 % 이내의 낮은 값을 나타내었다. 마이크로웨이브와 초음파 각각을 이용한 전처리 공정은 그 효과가 크지 않거나 미미하였으나 묽은 황산처리와 복합적으로 적용했을 때는 그 효과는 상당히 큰 것으로 나타났다. 특히 마이크로웨이브와 묽은 황산처리를 순차적으로 적용했을 때 자일로스 수율은 2배 넘게 향상되었다. 향후에는, 다양한 복합 전처리 공정에 대한 심도있는 연구와 더불어 전처리와 효소당화 공정의 최적화에 대한 연구를 수행할 계획이다. The wasted corn stalk from Gangwon province is composed of 44.6 % glucan, 19.0 % xylan, 23.8 % lignin, 4.5 % ash and 8.1 % others. Statistical analysis, full factorial design, revealed that temperature was the most influential factor in the dilute sulfuric acid pretreatment and that the influence of temperature on xylose yield was 3.5 and 3.2 times higher than those of treatment time and acid concentration, respectively. Temperature was also the most influential factor for glucose yield in the pretreatment but it was less than 5 % throughout the pretreatment. Although minor sugar yield was observed when microwave or ultrasonication was solely introduced as a pretreatment method, the complex method incorporating microwave or ultrasonication into dilute sulfuric acid pretreatment enhanced sugar yield significantly. In particular, xylose yield was doubled when microwave and dilute sulfuric acid treatment was sequentially applied. The optimization of pretreatment and enzymatic hydrolysis as well as the investigation on the complex pretreatment in detail are left for further study.

Investigation of the Polarization-dependent Optical Force in Optical Tweezers by Using Generalized Lorenz-Mie Theory

최재민,노희소 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.12

In vectorial diffraction theory, tight focusing of a linearly-polarized laser beam produces an anisotropic field distribution around the focal plane. We present a numerical investigation of the electromagnetic field distribution of a focused beam in terms of the input beam’s polarization state and the associated effects on the trap stiffness asymmetry of optical tweezers. We also explore the symmetry change of a polarization-dependent optical force due to the electromagnetic field redistribution in the presence of dielectric spheres of selected diameters ranging from the Rayleigh scattering regime to the Mie scattering regime.

턱관절자세음양교정술(Functional Cerebro-Spinal Therapy, FCST)을 이용한 어지럼증 치료 1예

최재민,이영준,Choi, Jai-Min,Lee, Young Jun 턱관절균형의학회 2015 턱관절균형의학회지 Vol.5 No.no.sup

A dizziness case with functional cerebro-spinal therapy (FCST) was reviewed to explore the effect of FCST. The case was managed with Yinyang Balancing Appliance (YBA) and the TMJ Balancing Appliance (TBA), combined with acupuncture, cupping and herbal medicine. Clinical outcome measurement was performed based on subjective measures and clinical observation. The patient showed positive changes starting after the first treatment. Futher clinical and biological research on FCST is expected.

Milton and The Restoration

최재민 한국고전중세르네상스영문학회 2010 중세근세영문학 Vol.20 No.2

Despite the fact that Milton’s Paradise Lost was published in the Restoration, the epic has been often considered as a literary work representing English civil war literature. The conventional reading of Milton’s epic as a legacy of English civil war and its religious and political conflicts tends to overlook the dialogic and oppositional voice in the poem that Milton, both covertly and openly, used to challenge the moral and social status of King Charles II and his court in the early Restoration. Inspired with the revisionist views supported by the literary historians, such as N. H. Keeble and Jonathan Scott, this paper suggests an alternative way of reading Paradise Lost as a literary piece perfectly in tune with the Restoration as an age riddled with diverse conflicts and tensions. In the first half, the paper surveys the popular understanding of the Restoration Milton to reveal how it serves to support and, in turn, is supported by the conventional historiography of the Restoration. The latter half of the paper revisits a couple of places in Paradise Lost in order to illustrate how Milton positions himself in opposition to King Charles II and his court followers, especially through the critical engagement of gluttony and drunkenness.

광집게 실험에서 매질의 굴절률 차이에 의한 구면수차 효과 및 제어

최재민 한국물리학회 2016 새물리 Vol.66 No.2

The working range of optical tweezers deep inside a suspension medium is severely limited by the refractive-index-mismatch spherical aberration (RIMSA) due to the presence of media with different indices of refraction, $e.g.$, an immersion medium, a coverslip, and a suspension medium. In this case study, the feasibility of versatile optical tweezers with a moderate NA objective is investigated with a wavefront correction method. The effect of RIMSA on a tightly-focused beam through planar interfaces is described with the angular spectrum representation based on the rigorous vectorial diffraction theory, and the associated effects on optical tweezers are presented by evaluating the light-matter interaction in the Rayleigh region. Finally, I show that a stable optical trap for 70-nm silica spheres 100 $\mu$m deep inside a suspension medium can be realized with a 780-nm laser beam of a few tens of mW by using a moderate NA objective lens having a centimeter-long working distance. 본 연구에서는 빛을 강하게 집속하는 경로에 존재하는 매질들의 굴절률 차이에의해 발생하는 구면수차에 의한 집속광선 분포의 변화를 빛의 편광 및 매질의 경계면에서의 반사등을 포함하는 벡터 회절 이론을 사용하여 기술하였다. 또한 이러한 수차 효과를 광포획 장치를 구현하는 일반적인 상황에 적용하여 광포획에 미치는 영향을 평가하고 구면수차에의한 파면의 변화를 복원하는 방안을 제시하였다. 이를 통해 NA = 0.61의 렌즈를 사용해서도 수십 나노미터 크기의 유전입자를 100 $\mu$m의 깊이에서 안정적으로 포획할 수 있는 광포획 우물을 형성시킬 수 있음을 보였다.