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배동현,김재민,원유덕,최규선,정진환,이형중,김충현 대한뇌혈관외과학회 2014 Journal of Cerebrovascular and Endovascular Neuros Vol.16 No.3
Objective : Because of the complex anatomical association among vascular,dural, and bony structures, paraclinoid internal carotid artery (ICA)aneurysms remain a major challenge for vascular neurosurgeons. Westudied the clinical outcomes of 61 paraclinoid ICA aneurysms after microsurgicalclipping in comparison with endovascular coiling. Materials and Methods : Between January 2008 and December 2012, wetreated 61 paraclinoid ICA aneurysms created by surgical clipping or endovascularcoiling. Preoperative neurologic status and postoperative outcomewere evaluated using the Glasgow coma scale (GCS) and themodified Rankin scale (mRS). Postoperative hydrocephalus and vasospasmwere reviewed using the patients' medical charts. Results : Most patients were in good clinical condition before the operationsand had good treatment outcomes. Clinical vasospasm was observedafter the operation in five patients, and hydrocephalus occurred insix patients. No statistically significant difference regarding aneurysm size,sex, GCS score, H-H grade, and mRS was observed between the surgicalclipping group and the endovascular coiling group. In addition, the treatmentresults and complications did not show statistically significant differencein either group. Conclusion : Surgical occlusion of paraclinoid ICA aneurysms is difficult;however, no significant differences were observed in the treatment resultsor complications when compared with coil embolization. In particular, useof an adequate surgical technique may lead to better outcomes thanthose for coil embolization in the treatment of large and/or wide-neckparaclinoid ICA aneurysms.
Eu^(3+)가 첨가된 Gd₂O₃나노튜브의 제조 및 광학적 특성
배동현,장기완,이호섭,이성수,정중현 한국물리학회 2011 새물리 Vol.61 No.7
습식법을 이용하여 전구체 Gd₂O₃나노튜브를 제조한 후, 공기중에서의 열처리를 통하여 Eu^(3+)가 첨가된 Gd₂O₃ 나노튜브를제조하였다. 제조된 시료의 구조 및 형상은 XRD, 라만분광 및 FE-SEM을이용하여 분석하였으며, 광활성제로 첨가된 Eu^(3+)의 광학적 특성은여기 및 발광스펙트럼 등의 측정을 통하여 분석하였다. 라만스펙트럼의분석을 통하여 기존에 보고되지 않은 새로운 피크가 존재한다는 사실을확인하였으며, 전하이동밴드에 의한 여기효율은 Gd₂O₃ 나노튜브에첨가된 Eu^(3+)의 농도가 7%일 때에 가장 좋았다. 254 nm의여기파장으로 시료를 여기하여 Eu^(3+)에 기인한 발광스펙트럼을측정한 결과, 전형적인 Eu^(3+)에 기인한 발광특성를 보여주고 있으며,모든 천이들 가운데에 ^5(D_0)-^7(F_2)천이에 해당하는 613 nm 에서발광세기가 가장 강하였다. 또한, Gd₂O₃의 용융온도가 2,330℃ 매우 높은데도 불구하고, 열처리 온도가 1,100℃이상에서는 나노튜브가 용융되기 시작한다는 사실도 확인하였다. Eu^(3+) doped Gd₂O₃nanotubes were prepared by employing a simple wet-chemical route through heat treatment in air by using Gd(OH)3 as the precursor. Their structural and morphological features were analyzed by using X-ray diffraction (XRD), Raman spectroscopy and field-emission scanning electron microscopy (FE-SEM). The photoluminescent properties of Eu^(3+) doped Gd₂O₃ nanotubes were studied by measuring their excitation and emission spectra. New Raman peaks, not previously reported were found at 250 cm^(-1) through an analysis of Raman spectra. We also noticed a strong charge transfer band in the excitation spectrum of Eu^(3+) doped Gd₂O₃ nanotubes, and it quenched at 7 mol% of Eu^(3+). Using 254 nm as the excitation wavelength, we recorded the emission spectr of Eu^(3+) doped Gd₂O₃ nanotubes, and it exhibited all the characteristic transitions of the Eu^(3+) dopant ion, and among all, the ^5(D_0)-^7(F_2) transition at 614 nm was most intense. Even though bulk Gd₂O₃ has a high melting temperature of 2,330℃, the studied nanotube samples began to melt at 1,100℃.
자동계류시스템을 위한 ORB 특징점 및 시야 절두체 기반 3D LiDAR 점군 정합 기법
배동현,최진규,남택근,김헌희 한국항행학회 2025 한국항행학회논문지 Vol.29 No.6
본 논문은 자동계류시스템의 선체 형상 인식을 위한 3D LiDAR 점군 정합 기법을 제안한다. 접안 환경에서는 원거리 저밀도, 근거리 시야각 제약, 단조로운 선체 기하학적 특징으로 인해 반복 최근접점(ICP) 알고리즘의 정합 성능이 저하된다. 이에 본 연구에서는 3D LiDAR 주변광 영상의 ORB 특징점과 2D영상-3D점군 인덱스 대응을 활용하여 추정된 변환행렬을 ICP의 초기값으로 이용하고, 절단 부호 거리 함수(TSDF) 모델에서 가상의 센서 시야 절두체를 정의하여 현재 시야 내 점군만을 대응쌍 탐색에 포함시킨다. 실험 결과, 제안 기법은 기존 점-대-평면 ICP 대비 정합 정확도 58% 향상을 달성하였다. This paper proposes a 3D LiDAR point-cloud registration method for ship-hull recognition in automatic mooring systems. During berthing, iterative closest point (ICP) performance degrades due to low point density at long range, field-of-view constraints at close range, and monotonous geometric features of ship hull surfaces. To address these issues, we extract oriented FAST and rotated BRIEF (ORB) features from the 3D LiDAR ambient image and utilize 2D image-3D point-cloud index correspondences to estimate a transformation matrix, which is then used as the initial value for ICP. Additionally, we define a virtual sensor viewport frustum in the truncated signed distance function (TSDF) model to include only points within the current field of view in the correspondence search. Experimental results demonstrate that the proposed method achieves a 58% improvement in registration accuracy compared to conventional point-to-plane ICP.
RGB-Thermal 카메라를 이용한 실시간 증기 배관 누설 감지 시스템에 관한 연구
배동현,이정형,남택근,김헌희 해양환경안전학회 2025 해양환경안전학회지 Vol.31 No.1
본 연구는 선박 기관실 내에 설치된 증기 배관을 대상으로 누설 감지 및 상태 모니터링을 위한 방법론을 다루고 있다. 일반적으로 기관실 내의 증기 배관은 보온재로 둘러싸여 있으므로, 증기가 누설되더라도 육안으로 식별하기 어려워 초기 대응을 지연시키는 상황이 발생할 수 있다. 이에 본 논문은 RGB 카메라와 Thermal 카메라를 이용하여 상호보완적 정보 제공이 가능한 센서 시스템을 개발하기 위한 하드웨어 및 소프트웨어의 설계 방법을 제안한다. 보다 세부적으로 제안된 시스템은 카메라 서버 모듈, 카메라 보정 모듈, 영상 정합 모듈, 열-지도 학습 모듈, 추론 및 시각화 모듈로 구성된다. 특히 증기 배관의 누설이 이상 고온을 초래한다는 점을 고려하여, 본 논문은 열-지도의 개념을 정의하고 열-지도의 효과적인 학습, 열-지도에 기반한 이상 고온 감지, 감지된 이상 고온 영역의 시각화를 위한 알고리즘을 제안한다. 제안된 방법은 선박 증기 배관 시스템을 모사한 실험 장치를 이용하여 다양한 실험을 통해 그 효용성을 입증한다. In this study, we propose a methodology for leak detection and monitoring of steam pipes installed in ship engine rooms. Generally, steam pipes in engine rooms are wrapped with insulation materials, making it difficult to visually identify steam leaks and potentially delaying initial response. Therefore, we propose hardware and software design methods for a sensor system that provides complementary information using RGB and thermal cameras. Specifically, the proposed system consists of a camera server module, a camera calibration module, an image alignment module, a thermal-map training module, and an inference and visualization module. Considering that the steam pipe leak results in high temperatures, we define the concept of a thermal-map and propose algorithms for effective learning of the thermal map, detection of abnormally high temperatures based on the thermal map, and visualization of the detected abnormal regions. The effectiveness of the proposed method was evaluated through various experiments using an experimental setup that simulates the steam piping system of a ship.
Eu3+이 첨가된 Gd2O3 구형 형광체의 제조 및 광학적 특성
배동현,장기완,이호섭,서효진,조신호 한국물리학회 2013 새물리 Vol.63 No.8
Catalyst free Gd2O3:Eu3+sphere phosphors were prepared by using hydrolysis method, and their structural & optical properties were investigated. Their structural and morphological features were analyzed by using X-ray diffraction (XRD) and Field-emission scanning electron microscopy (FESEM). The photoluminescence properties of the Eu3+-doped Gd2O3 spheres were studied by using a spectrophotometer to measure their excitation and emission spectra. The X-ray diffraction profiles showed that all peaks could be attributed to the cubic phase which is in good agreement with the standard JCPDS (86-2477) card. FE-SEM indicated that the morphology of the phosphor sphere had with an outer diameter of about 500 nm. We also observed a strong charge transfer band in the excitation spectrum of Eu3+-doped Gd2O3-sphere phosphors, which quenched at Eu3+ concentrations over 7 mol%. We also recorded the emission spectra of Eu3+-doped Gd2O3-sphere phosphors at excitation wavelength of 254 nm. The results showed all the characteristic transitions of the Eu3+ dopant ion, along with a high-intensity peak at 613 nm which corresponded to the 5D0-7F2 transition. 가수분해법을 응용하여 별다른 촉매없이 Gd2O3:Eu3+구형형광체를 제조하고 결정구조와 광학적 특성에 대하여 연구하였다. 제조된시료의 결정구조 및 형상은 XRD, FE-SEM을 이용하여 분석하였으며,광활성제로 첨가된 Eu3+의 광학적 특성은 여기 및 발광스펙트럼등의 측정을 통하여 분석하였다. XRD 분석을 통하여 Gd2O3결정에대한 표준 JCPDS와 제조된 시료에 대한 주요 피크들이 잘 일치함을관찰할 수 있었고, 이들로부터 Eu3+가 첨가된 Gd2O3:Eu3+ 시료는입방 구조임을 확인하였다. FE-SEM을 이용해 측정한 결과, 직경이 약 500nm 정도인 구형모양이었다. 전하이동밴드에 의한 여기효율은 구형의Gd2O3 모체에 첨가된 Eu3+의 농도가 7%일 때에 가장 좋았다. 또한 254 nm의 여기파장으로 시료를 여기하여 Eu3+에 기인한발광스펙트럼을 측정한 결과, 전형적인 Eu3+에 기인한 발광특성을보였으며, 모든 천이들 가운데에 5D0-7F2 천이에 해당하는613 nm 에서 발광세기가 가장 강하였다.
Ti/Al/STS 클래드재의 접합특성에 미치는 예비 열처리의 영향
배동현 ( Dong Hyun Bae ),정수정 ( Su Jung Jung ),조영래 ( Young Rae Cho ),정원섭 ( Won Sup Jung ),정호신 ( Ho Shin Jung ),강창룡 ( Chang Yong Kang ),배동수 ( Dong Su Bae ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.9
Titanium/aluminum/stainless steel(Ti/Al/STS) clad materials have received much attention due to their high specific strength and corrosion-resisting properties. However, it is difficult to fabricate these materials, because titanium oxide is easily formed on the titanium surface during heat treatment. The aim of the present study is to derive optimized cladding conditions and thereupon obtain the stable quality of Ti/Al/STS clad materials. Ti sheets were prepared with and without pre-heat treatment and Ti/Al/STS clad materials were then fabricated by cold rolling and a post-heat treatment process. Microstructure of the Ti/ Al and STS/Al interfaces was observed using a Scanning Electron Microscope(SEM) and an Energy Dispersed X-ray Analyser(EDX) in order to investigate the effects of Ti pre-heat treatment on the bond properties of Ti/ Al/STS clad materials. Diffusion bonding was observed at both the Ti/Al and STS/Al interfaces. The bonding force of the clad material with non-heat treated Ti was higher than that with pre-heat treated Ti before the cladding process. The bonding force decreased rapidly beyond 400℃, because the formed Ti oxide inhibited the joining process between Ti and Al. Bonding forces of STS/Al were lower than those of Ti/Al, because brittle Fe3Al, Al3Fe intermetallic compounds were formed at the interface of STS/Al during the cladding process. In addition, delamination of the clad material with pre-heat treated Ti was observed at the Ti/Al interface after a cupping test.
합기도장의 서비스스케이프와 가치인식 및 경영활성화 관계 연구
배동현(Bae, Dong-Hyun),고영완(Ko, Young-Wan),김종언(Kim**, jong-won) 한국대학검도연맹(대한검도학회) 2024 대한검도학회지 Vol.35 No.1
본 연구의 목적은 합기도장의 서비스스케이프와 가치인식 및 경영활성화의 구조적 관계를 규명하는데 있다. 이를 위해 합기도 선수 혹은 선수경험이 있거나 여가활동으로 합기도를 수련하고 있는 성인으로 모집단을 선정하였다. 본 연구의 목적을 달성하기 위해 설문지를 활용하였으며, 구조방정식모형 분석을 연구목적에 부합하는 선행연구와 이론에 근거하여 총 42문항으로 구성하였다.<BR/> 2023년 3월부터 2023년 6월까지 4개월 동안 전라남도, 전라북도 지역에 소재하고 있는 합기도장 10개소를 방문하여 성인 수련생과 선수들을 대상으로 비확률표본추출법 중 편의표본추출법(convenience sampling method)을 총 300부의 데이터를 모집하였으나 이 중 연구에 사용하기 어려운 데이터(이중응답 및 무기입 등) 34부를 제외한 266부(88.7%)를 최종 데이터로 활용하였다.<BR/> 수집된 자료는 부호화하여 SPSS 24.0과 AMOS 21.0의 통계프로그램을 이용하여 빈도분석, 확인적 요인분석, Cronbach’s α, 상관관계분석, 구조방정식모형 분석을 실시하였으며 그 결과는 다음과 같다.<BR/> 첫째,‘합기도장의 서비스스케이프는 가치인식에 정적영향을 미칠 것이다.’의 검증결과 서비스스케이프의 모든 하위요인은 품질가치와 가격가치에 정적영향을 미치는 것으로 나타났으며, 서비스스케이프의 구성요인 중 공간배치와 관리상태는 감정가치에, 접근성과 주변환경은 사회가치에 정적영향을 미치는 것으로 나타났다.<BR/> 둘째,‘합기도장의 서비스스케이프는 경영활성화에 정적영향을 미칠 것이다.’의 검증결과 서비스스케이프의 모든 하위요인은 경영활성화에 정적영향을 미치는 것으로 나타났다.<BR/> 셋째,‘가치인식은 경영활성화에 정적영향을 미칠 것이다.’의 검증결과 가치요인의 모든 하위요인은 경영활성화에 정적영향을 미치는 것으로 나타났다.<BR/> 이상의 연구결과는 합기도장의 경영활성화에 서비스스케이프와 가치인식 간의 유의한 상관관계가 있는 것으로 파악되었다. 따라서 합기도장에서는 회원들의 특성을 고려한 타겟 마케팅 전략을 수립하고, 회원들의 경험을 개선하기 위해 서비스스케이프를 기반으로 효과적인 마케팅 전략을 실행할 필요가 있다. 이러한 노력을 통해 경영활성화를 달성하고 합기도장의 경영활성화를 지속적으로 유지할 수 있을 것이다. The purpose of this study is to elucidate the structural relationship between the service scape, perceived value, and managerial activation of a Hapkido gym. To achieve this goal, a sample population of adults with experience as Hapkido practitioners or those who engage in Hapkido as a leisure activity was selected. For this study's purpose, a questionnaire consisting of a total of 42 items was developed based on prior research and theories that align with the research objectives.<BR/> Data were collected from March 2023 to June 2023 over a four-month period by visiting ten Hapkido gyms located in Jeollanam-do and Jeollabuk-do regions. A total of 300 questionnaires were distributed to adult trainees and practitioners using convenience sampling. After excluding 34 unusable responses (e.g., duplicate responses or incomplete data), 266 responses (88.7%) were utilized as the final dataset.<BR/> The collected data were encoded, and statistical analysis was conducted using SPSS 24.0 and AMOS 21.0. The analysis included frequency analysis, confirmatory factor analysis, Cronbach's α, correlation analysis, and structural equation modeling (SEM). The results are as follows: <BR/> Firstly, the validation of the hypothesis that The service scape of a Hapkido gym will have a significant static impact on perceived value revealed that all subfactors of the service scape had a static impact on quality value and price value. Among the components of the service scape, spatial arrangement and management condition had a static impact on emotional value, while accessibility and the surrounding environment had a static impact on social value.<BR/> Secondly, the validation of the hypothesis that The service scape of a Hapkido gym will have a significant static impact on managerial activation showed that all subfactors of the service scape had a static impact on managerial activation.<BR/> Lastly, the validation of the hypothesis that Perceived value will have a significant static impact on managerial activation indicated that all subfactors of the value factors had a static impact on managerial activation.<BR/> The study results suggest a significant correlation between the service scape, perceived value, and managerial activation in Hapkido gyms. Therefore, Hapkido gyms should consider formulating targeted marketing strategies tailored to members' characteristics and implementing effective marketing strategies based on the service scape to enhance members' experiences. These efforts can help achieve and sustain managerial activation in Hapkido gyms.
STS/Al/Cu 클래드재의 파괴거동 및 기계적 물성에 미치는 인장시험 온도의 영향
배동현 ( Dong Hyun Bae ),최영준 ( Young Jun Choi ),정원섭 ( Won Sub Chung ),배동수 ( Dong Su Bae ),조영래 ( Young Rae Cho ) 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.12
In order to meet increasingly complex and rigorous technical specifications, extensive effort has been devoted to fabricate clad materials with multi-layered metal plates. In this study, novel stainless steel/aluminum/copper (STS/Al/Cu) three-ply clad materials were fabricated by a hot rolling process for cookware applications. The effect of the testing temperature on the mechanical properties of the clad materials and on each component metal was investigated during the tensile tests. The interface properties of the clad materials were also examined by optical microscopy (OM) and an electron probe micro-analyzer (EPMA). The best mechanical and interfacial properties for a warm working process were found in a sample annealed at a temperature of 300℃. For the sample annealed at 400℃, the results of the tensile test indicated that interface delamination occurred only in the region of the Al/Cu interfaces. This was due to the formation of the thick and brittle intermetallic compound of Al2Cu in the Al/Cu interface. In contrast, no interface delamination was observed in the STS/Al interface, most likely due to its strong bond strength.