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윤현준(Hyeonjun Yoon),이성열(Sungyeol Lee),백원진(Wonjin Baek),강재모(Jaemo Kang),김진영(Jinyoung Kim),고화빈(Hwabin Ko) 한국지반환경공학회 2023 한국지반환경공학회논문집 Vol.24 No.8
최근 이상기후로 인한 집중호우가 빈번히 발생함에 따라 비탈면의 표층 유실 및 간극수압의 증가로 인한 비탈면의 붕괴가 자주 발생하고 있다. 비탈면의 붕괴를 방지하기 위해서 활동저항력을 증가시키거나 간극수압을 감소시키는 등의 다양한 공법들이 적용되고 있으며, 활동저항력과 간극수압의 조건을 동시에 만족시킬 수 있는 공법이 적용되면 비탈면 붕괴에 효율적으로 대응할 수 있기 때문에 이에 관한 연구가 꾸준히 수행되고 있는 추세이다. 따라서 본 연구에서는 기존 수평으로 적용되는 배수재의 매설 경사를 상향 방향으로 매설하여, 비탈면의 보강 및 배수 기능을 모두 만족시킬 수 있는 상향식 비탈면 보강 공법을 제안하였다. 또한, 제안한 공법의 보강 및 배수효과가 가장 우수한 매설각도를 확인하기 위해 대표 단면에 수평 배수재를 0°~60°로 10° 단위로 설정한 조건에서 공법의 보강 및 배수 효과를 확인하였으며, 배수효과가 가장 뛰어난 40°와 안전율이 가장 우수한 20°의 조건으로 실내 모형실험을 수행하여 수치해석 결과를 검증하였다. 그 결과, 수치해석 결과와 마찬가지로 40°에서 상대적으로 배수효과가 높게 나타났으며, 20°의 경우 원활한 배수가 이루어지지 않아 비탈면이 붕괴되는 현상을 관찰할 수 있었다. 또한, 상향식 비탈면 보강재의 보강 및 배수효과를 확인할 수 있었다. Due to frequent occurrences of concentrated heavy rainfall caused by abnormal climate conditions in recent years, collapses of steep slopes have been occurring frequently due to surface erosion and increased pore water pressure. Various methods are being applied to prevent slope collapses, such as increasing the resistance to movement and reducing pore water pressure. Research on these methods has been consistently conducted as they provide an efficient response to slope collapses by satisfying both the conditions of resistance to movement and pore water pressure simultaneously. Therefore, in this study, we propose an upward slope reinforcement method by burying drainage materials with an upward slope inclination, instead of the conventional horizontal application. This approach aims to satisfy both slope reinforcement and drainage functions effectively, offering a comprehensive solution for slope stabilization. Furthermore, to determine the optimal burial angle that exhibits the most effective reinforcement and drainage effects of the proposed method, we investigated the reinforcement and drainage effects under conditions where the horizontal drainage materials were set at angles ranging from 0° to 60° in increments of 10° on a representative cross-section. Additionally, indoor model experiments were conducted under the conditions of 40°, which showed the most outstanding drainage effect, and 20°, which exhibited the highest safety factor, to validate the numerical analysis results. The results showed that the burial angle of 40° exhibits a relatively higher drainage effect as with the numerical analysis results, while the angle of 20° results in inadequate drainage and observed slope collapse.
Non-invasive Face Registration for Surgical Navigation
Seungwoo Kang,Hyeonjun Kim,Taeyong Park,Jeongjin Lee,Hyunjoo Song 한국정보과학회 2022 Journal of Computing Science and Engineering Vol.16 No.4
This study aims to propose a precise rigid-body face registration method that does not require an invasive marker attachment for surgical navigation devices. The non-invasive face registration involved the following steps: anatomical feature points such as the eyes and nose are found from the computed tomography (CT) image and the location tracking device attached to the patients forehead prior to the procedure; an initial registration is attempted on the two previously extracted feature points; secondary registration was performed using a coherent point drift (CPD) algorithm; and using the Powell method, precise registration was performed to minimize the closest point registration error (CPRE). The CPRE co-registration accuracy was measured for the original and sampled phantom data, and the error was found to be 1.07 mm on average for skin coordinate data. The method introduced in this study enabled precise rigid-body face registration in a non-invasive manner using only skin coordinates.
An, Cheng Jin,Kang, Young Hun,Song, Hyeonjun,Jeong, Youngjin,Cho, Song Yun The Royal Society of Chemistry 2017 Journal of Materials Chemistry A Vol.5 No.30
<P>The development of n-type polymers and composites to pair with their p-type counterparts in current flexible thermoelectric (TE) generators is crucial to reach the full potential of these devices. However, this development has lagged behind because of difficulties associated with n-type doping of organic semiconductors. Our study focused on the doping characteristics of directly spun carbon nanotube (CNT) webs using various n-type dopants in combination with thermal desorption of oxygen from the CNT web surface for more effective n-type doping. Annealing of the CNT web followed by treatment with 2 mg mL<SUP>−1</SUP>benzyl viologen (BV) resulted in a maximum power factor of 3103 μW m<SUP>−1</SUP>K<SUP>−2</SUP>, which was superior to that of a BV-treated pristine CNT web without thermal annealing (1901 μW m<SUP>−1</SUP>K<SUP>−2</SUP>). This value is the highest among organic TE materials and similar to that of the most promising inorganic material, Bi2Te3at room temperature. In addition to the effect of BV dopants on the electrical properties, the thermal diffusion property of the BV-doped CNT web was analyzed using the finite element method. The dopant coating on the CNT bundle efficiently suppressed the phonon transfer along the CNT web direction, which led to a reduction of the thermal conductivity of the CNT web. As a counterpart for the n-type CNT web, p-type TE materials with a thermal power of 2252 μW m<SUP>−1</SUP>K<SUP>−2</SUP>were also prepared using molecular dopants of 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane. Finally, a p-n junction-type TE module with an unprecedented power density of 1.18 mW cm<SUP>−2</SUP>was fabricated based on the development of these competitive n-type TE materials.</P>
Nanoscale Single-Element Color Filters
Hyun, Jerome K.,Kang, Taehee,Baek, Hyeonjun,Kim, Dai-sik,Yi, Gyu-chul American Chemical Society 2015 NANO LETTERS Vol.15 No.9
<P>Visible-light filters constructed from nanostructured materials typically consist of a metallic grating and rely on the excitation of surface plasmon polaritons (SPPs). In order to operate at full efficiency, the number of grating elements needs to be maximized such that light can couple more efficiently to the SPPs through improved diffraction. Such conditions impose a limitation on the compactness of the filter since a larger number of grating elements represents a larger effective size. For emerging applications involving nanoscale transmitters or receivers, a device that can filter localized excitations is highly anticipated but is challenging to realize through grating-type filters. In this work, we present the design of an optical filter operating with a single element, marking a departure from diffractive plasmonic coupling. Our device consists of a ZnO nanorod enclosed by two layers of Ag film. For diffraction-limited light focused on the nanorod, narrow passbands can be realized and tuned via variation of the nanorod diameter across the visible spectrum. The spectral and spatial filtering originates from scattering cancellation localized at the nanorod due to the cavity and nanorod exhibiting opposite effective dipole moments. This ability to realize high-performance optical filtering at the ultimate size introduces intriguing possibilities for nanoscale near-field communication or ultrahigh resolution imaging pixels.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2015/nalefd.2015.15.issue-9/acs.nanolett.5b02049/production/images/medium/nl-2015-02049m_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl5b02049'>ACS Electronic Supporting Info</A></P>
조한얼,이장우,Seong Woong Kang,Won Ah Choi,Hyeonjun Oh,Kil Chan Lee 대한재활의학회 2016 Annals of Rehabilitation Medicine Vol.40 No.1
Objective To evaluate pulmonary functions of patients with amyotrophic lateral sclerosis (ALS), Duchenne muscular dystrophy (DMD), and myotonic muscular dystrophy (MMD) at the onset of ventilatory insufficiency.Methods This retrospective study included ALS, DMD, and MMD patients with regular outpatient clinic follow-up in the Department of Rehabilitation Medicine at Gangnam Severance Hospital before the application of non-invasive positive pressure ventilation (NIPPV). The patients were enrolled from August 2001 to March 2014. If patients experienced ventilatory insufficiency, they were treated with NIPPV, and their pulmonary functions were subsequently measured.Results Ninety-four DMD patients, 41 ALS patients, and 21 MMD patients were included in the study. The mean SpO2 was lower in the MMD group than in the other two groups. The mean forced vital capacity (FVC) in the supine position was approximately low to mid 20% on average in DMD and ALS patients, whereas it was 10% higher in MMD patients. ALS patients showed a significantly lower FVC in the supine position than in the sitting position. Maximal insufflation capacity, unassisted peak cough flow, maximum inspiratory pressure (MIP), and maximum expiratory pressure (MEP) were significantly higher in MMD group than in the other groups. MEP was significantly the lowest in DMD patients, followed by in ALS, and MMD patients, in order.Conclusion Disease-specific values of pulmonary function, including FVC, MEP, and MIP, can be accurately used to assess the onset of ventilatory insufficiency in patients with ALS, DMD, and MMD.