이미지 데이터를 모니터링하는 관리도에서 이미지와 ROI 크기 조정의 영향

이주형,윤형욱,이성민,이재헌,Lee, JuHyoung,Yoon, Hyeonguk,Lee, Sungmin,Lee, Jaeheon 한국통계학회 2017 응용통계연구 Vol.30 No.3

A machine vision system (MVS) is a computer system that utilizes one or more image-capturing devices to provide image data for analysis and interpretation. Recently there have been a number of industrial- and medical-device applications where control charts have been proposed for use with image data. The use of image-based control charting is somewhat different from traditional control charting applications, and these differences can be attributed to several factors, such as the type of data monitored and how the control charts are applied. In this paper, we investigate the adjustment effect of image size and region of interest (ROI) size, when we use control charts to monitor grayscale image data in industry. 최근 산업의 생산공정에서는 머신비전시스템을 통하여 제품의 품질특성치에 대한 정보를 이미지 데이터로 제공하는 경우가 많다. 따라서 산업과 의학 현장에서 이미지 데이터의 모니터링을 위해 관리도 절차의 필요성이 많이 대두되고 있다. 이미지 데이터를 모니터링하는 관리도 절차는 전통적으로 사용하는 관리도 절차와 유사한 점도 있지만, 데이터의 구조를 비롯하여 각 이미지에서 ROI를 설정하여 관리도 절차를 적용하는 등 서로 다른 점도 많이 있다. 이 논문에서는 생산공정에서 제공되는 이미지 데이터에 대해 관리도를 사용하는 절차를 소개하고, 이미지 또는 ROI 크기의 확대와 축소가 제품의 이상원인을 탐지하는데 어떠한 영향이 주는지를 모의실험을 통하여 알아보았고 각 관리도의 성능 또한 비교하였다.

HVPE 법을 통한 GaN 성장 시 기판 종류 및 V/III 비에 따른 잔류 stress 특성 연구

이주형,이승훈,이희애,강효상,오누리,이성철,이성국,박재화,Lee, Joo Hyung,Lee, Seung Hoon,Lee, Hee Ae,Kang, Hyo Sang,Oh, Nuri,Yi, Sung Chul,Lee, Seong Kuk,Park, Jae Hwa 한국결정성장학회 2020 한국결정성장학회지 Vol.30 No.2

본 연구에서는 HVPE 성장법으로 GaN 성장 시 GaN 내에 잔류하는 stress로 인한 crack 현상을 감소시키고자 기판 종류 및 V/III 비를 조절하여 잔류 stress 특성을 알아보고자 하였다. Sapphire, GaN template 위에 각각 V/III 비 5, 10, 15의 조건으로 GaN을 성장시켜 형성된 hexagonal pit의 분포 및 깊이를 분석하였다. 이를 통해 GaN on GaN template 성장에서 V/III 비가 높을수록 hexagonal pit의 분포 영역 및 깊이가 증가하는 것을 확인하였다. Raman 측정을 통해 hexagonal pit 영역 및 깊이가 컸던 GaN on GaN template 성장에서 V/III 비가 높을수록 stress가 감소하는 것을 확인하였다. 이를 통해 hexagonal pit의 분포 및 깊이가 증가할수록 잔류 stress가 낮아짐을 확인할 수 있었으며, 향후 후막 GaN 성장 시 stress 감소 가능성에 대해 확인하였다. The characteristics of the residual stress on the types of the substrate was investigated with adjusting the V/III ratio during GaN growth via the HVPE method. GaN single crystal layers were grown on a sapphire substrate and a GaN template under the conditions of V/III ratio 5, 10, and 15, respectively. During GaN growth, multiple hexagonal pits in GaN single crystal were differently revealed in accordance with growth condition and substrate type, and their distribution and depth were measured via optical microscopy(OM) and white light interferometry(WLI). As a result, it was confirmed that the distribution area and depth of hexagonal pit tended to increase as the V/III ratio increased. Moreover, it was found that the residual stress in GaN single crystal decreased as the distribution area and depth of the pit increased through measuring micro Raman spectrophotometer. In the case of GaN growth according to substrate type, the GaN on GaN template showed lower residual stress than the GaN grown on sapphire substrate.

전방십자인대 손상으로 인한 슬관절 불안정성에 따른 경골 골단 해면골 미세구조 변화 : 내방과 외방에서의 해면골 미세구조 패턴 변화

이주형,전경진,김한성,임도형,Lee, Joo-Hyung,Chun, Keyoung-Jin,Kim, Han-Sung,Lim, Do-Hyung 대한의용생체공학회 2012 의공학회지 Vol.33 No.2

Knee joint instability by anterior cruciate ligament(ACL) rupture is allowing the abnormal loading condition at the tibial epiphysis locally, resulting in producing locally different bone bruise. The study examined difference between local alteration patterns of trabecular bone microarchitecture at medial and lateral parts of the tibial epiphysis by ACL rupture. Fourteen SD rats were divided into Control(CON; n = 7) and Anterior Cruciate Ligament Transection(ACLT; n = 7) groups. The tibial joints were then scanned by in vivo ${\mu}$-CT at 0, 4, and 8 weeks post-surgery. The results showed that alteration pattern on trabecular bone microarchitecture at medial part was significantly higher than that at lateral part of the tibial epiphysis in ACLT group from 0 to 8 weeks(P < 0.05). Tb.Th and Tb.Sp distributions were well corresponded with differences between aforementioned trabecular bone microarchitectural alteration pattens at medial and lateral parts of the tibial epiphysis in ACLT group from 0 to 8 weeks(P < 0.05). These findings suggest that the alteration patterns of trabecular bone microarchitecture should be locally and periodically considered, particularly with respect to the prediction of bone fracture risk by ACL rupture. Improved understanding of the alteration patterns at medial and lateral trabecular bone microarchitectures at the tibial epiphysis may assist in developing more targeted treatment interventions for knee joint instability secondary to ACL rupture.

재미한인건설관리학회

이주형,정형석,조용권,곽영훈,Lee, Ju-Hyeong,Jeong, Hyeong-Seok,Jo, Yong-Gwon,Gwak, Yeong-Hun 한국건설관리학회 2013 한국건설관리학회 논문집 Vol.14 No.2

Sn-Zn 공정합금의 응고속도에 따른 조직과 기계적 성질에 관한 연구

이주형,이계완 ( J . H . Lee,K . W . Lee ) 한국주조공학회 1985 한국주조공학회지 Vol.5 No.4

The structures and mechanical properties of undirectionally solidified Sn-Zn eutectic alloys have been examined over the growth range 7㎜/h to 6,000㎜/h. The structures of undirectionally solidified Sn-Zn eutectic alloys were primarily broken-lamellar at growth rates below 760㎜/h and became fibrous at higher growth rates above that. At a growth rate 3,084㎜/h the structures were fibrouse only. There is no dendrites at any growth rates, but occasionally ribbon-like morphologies were seen. The under cooling increased parabolically with growth rate increase. The hardness of specimes increased with growth rates increase but heat-treated specimen decreased after growth rates 760㎜/h and became constant value. The effect of heat-treatment was good at lower growth rate. At room temperature tensile strength increased with growth rates up to R=990㎜/h and then tensile strength became near-constant value. The effect of heat-treatment was well at lower growth rate.

정규화 포락선 검파기와 얼리-레이트 필터를 적용한 새로운 홉 타이밍 예측기

이주형,Lee, Ju-Hyung 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.4C

본 논문에서 정규화 포락선 검파 기법(NED ; Normalized Envelop Detection)과 얼리-레이트 필터(ELF ; Early-Late Filter)가 적용된 새로운 홉 타이밍 예측기를 제안하였다. 제안한 구조의 성능 검증을 위해 컴퓨터 시뮬레이션으로 제안한 시스템과 기존 시스템의 동기 오차 측정 결과를 비교하였다. 시뮬레이션 결과를 통해서 부분 대역 재밍 환경에서 제안 구조가 기존 구조보다 정확하게 동기오차를 예측하는 것을 확인할 수 있었으며, 이러한 경향은 $E_b/N_j$와 재밍점유대역비(rho)가 낮을수록 더욱 뚜렷하였다. In this paper, the hop-timing estimator, which NED and ELF are adopted to, has been proposed. The estimation performance of the proposed scheme and the conventional scheme is compared through computer simulations. The simulation results show that the new system has less hop-timing error than the conventional system in partial band noise jamming channel. The lover Eb/Nj and ratio of jamming bandwidth(rho) we, the bigger performance enhancement of the proposed system is.

한국고대가람 변천양상에 관한 불교사적 고찰 - 불신관의 발전과 불탑 및 불상의 위상변천에 관한 분석을 중심으로 -

이주형,장석하,Lee, Zu-Hyung,Jang, Suk-Ha 한국건축역사학회 2011 건축역사연구 Vol.20 No.1

It is a true fact that the ancient Buddhist temples of Korea were great, important historical influence revealing the transition and developing stages of all the BUddhist temples in Eastern Asia including China and Japan. Before Mahayana arose within India, the monastery and pagoda were united during the conflict and development of the original Buddhism and pagoda faith. With the arising of Mahayana and the introduction of Buddhist statues, the Buddhist temple and pagoda were in conflict and resulted in separation. With the creation and development of the Mahayana Bodhisattva concept, Hinayana and Mahayana started to show doctrine differences and expressed each others' characteristics relevant to the structure of the temple. As a result, the Buddhist Temple having 1 pagoda spread in China together with Hinayana and Mahayana. The Buddhist temple of Hinayana had its temple and pagoda separated and the Buddhist temple that has a pagoda in front was divided into a form of 1 pagoda and 1 main temple. The temple and pagoda for Mahayana in the form of 1 pagoda and 2 temple, where the main statue of the Buddha may be worshipped from both the left and right hand sides, were separated in the form of 1 pagoda and 3 temples to have its original form again. Mahayana was first introduced into Goguryeo through the routes in the northern region and developed from having 1 pagoda and 2 temples, to having 1 pagoda and 3 temples. China was influenced by the southern regions, which is why Abhidharma was introduced into Baekje. Later on, the importance of Bodhisattva increased and the transition speed of the Buddhist temple having 1 pagoda and 3 temples accelerated, as Buddhism became more popular and as Mahayana flourished. The statue of the Buddha on both sides of the pagoda shall gradually move next to the central temple, and the temple shall form large crowds to not only form a tacit boundary with the pagoda but the expansion of Bodhisattva shall also have a wall or a corridor constructed in between the central, left and right hand side temples to form separate areas, and shall have a pagoda built in front of the temples that worship from both sides. In conclusion, independence shall exist among each Bodhisattva within the Buddhist temple, and the status of the pagoda shall fall and appear as the pagoda on both sides in front of the main Buddha statue.

실트함량에 따른 카올리나이트의 침식특성 평가

이주형,박재현,정문경,곽기석,Lee. Ju-Hyung,Park. Jae-Hyun,Chung. Mun-Kyung,Kwak. Ki-Seok 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1

The scour phenomenon involves the erosive potential of flowing water and the relative ability of the soil to resist erosion. The scour phenomenon in cohesive soils is much different from that in non-cohesive soils. Granular soils resist erosion by their buoyant weight and the friction between the particles. The soil particles are dislodged individually from the bed under the action of the eroding fluid. Scour in cohesive soils is much slower and more dependent on soil properties than that in non-cohesive soils. Therefore the analysis models for estimating erosion characteristics of cohesive soils should consider not only flowing water but also the relative ability of the soil to resist erosion. In this study, erosion characteristics for the clay-silt mixed soil will be analyzed as a fundamental study for development of bridge scour analysis and design system considering scour resistance capacity of a soil. For this analysis, the relationship between scour characteristics and soil properties was evaluated through scour rate test with Kaolinite samples remolded using various loading and contents of silt.

3차원 PCB 채널내에서의 복사-혼합대류 열전달 특성

이주형,박경우,박희용,Lee, J.H.,Park, K.W.,Pak, H.Y. 대한설비공학회 1996 설비공학 논문집 Vol.8 No.4

The interaction of turbulent mixed convection and surface radiation in a three-dimensional channel with the heated blocks is analyzed numerically. Two blocks are maintained at high temperature and the other bottom and horizontal walls are insulated. S-4 method is employed to calculate the effect of the radiative heat transfer. The low Reynolds number k-$\varepsilon$ model proposed by Launder and Sharma is used to estimate the turbulent influence on the heat transfer enhancement. From above modeling, the effects of various channel specifications on the flow and heat transfer characteristics are investigated. The variables used for the present study are Reynolds number, block spacing, the channel height spacing for block and the emissivity. Average Nusselt numbers along the block surfaces are correlated and presented in terms of Reynolds number, emissivity and dimensionless geometric parameters. For the range of conditions in this study, average Nusselt numbers along the block surfaces are strongly influenced by the Reynolds numbers and channel height spacing for block but weakly influenced by the block spacing and the emissivity of the adiabatic walls.

항재밍/저피탐 웨이브폼이 적용된 군 초소형 위성 통신체계 소개

이주형,박해원,정길수,Ju Hyung Lee,Hae-Won Park,Kil Soo Jeong 한국우주과학회 2023 우주기술과 응용 Vol.3 No.2

The existing military satellite communication system was based on geostationary satellites equipped with special communication payloads against enemy's jamming and signal reception. With the advent of new weapon systems such as unmanned systems, the need for low-orbit satellite-based communication system is increasing. This paper introduces various waveform technologies suitable for cube satellite-based communication system and the operational concept of a future military nanosatellite communication system.