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Key-layered normal distributions transform for point cloud registration
Hyunki Hong,Lee, B. H. IET 2015 Electronics letters Vol.51 No.24
<P>A new scan matching algorithm is proposed using the concept of key layers. In the conventional multi-layered normal distributions transform (MLNDT), the number of layers and iterations per layer are fixed and mismatches in point clouds occur due to the limited number of optimising iterations per layer. Moreover, the accuracy of registration is low and the number of layers is heuristically determined in MLNDT. The proposed key-layered normal distributions transform (KLNDT) works well with both enhanced success rate and accuracy. It is also possible for KLNDT to register in higher layers than the traditional MLNDT.</P>
Hyunki Hong,Hanjun Kim,B.H. Lee 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
The discontinuity of normal distributions transform (NDT) is caused by the discreteness of regular cells. To overcome the problem, the interpolation method using overlapped regular cells has been proposed and applied to point-to-distribution NDT registration (NDT-P2D). Although the method improves the accuracy of the registration, the accuracy and runtime against the overlap rate has not been analyzed yet. Also, the performance of the state-of-the-art distribution-to- distribution NDT registration (NDT-D2D) using the method has not been evaluated. In this paper, we evaluate the accuracy of NDT-D2D against overlap rate determined by the orthogonal interval of cells and the length of the cell. In experiments, we evaluated the accuracy and runtime against the interval and length respectively.
3차원 문화재의 사실적 표면 재질 표현을 위한 texture mapping 기술
홍현기(Hyunki Hong),황보택근(Teagkeun Whangbo) 한국HCI학회 2011 한국HCI학회 학술대회 Vol.2011 No.1
문화유산에 대한 데이터의 확보는 현재의 이익보다는 향후 미래의 엄청난 자산이라는 인식 하에 세계적으로 자국의 문화유산만 아니라 외국의 문화유산 데이터들도 확보하기 위해 노력하고 있다. 국내에서도 이러한 노력의 일환으로 3차원 스캐너를 이용하여 문화재를 스캔하였다. 3차원 스캐너를 통해 스캔된 문화재에 재질 정보를 넣기 위해서는 디자이너가 직접 수정을 해야한다. 이 작업에서 많은 시간이 소요되는 문제가 존재하여 이 문제를 해결하고자 본 논문에서는 특징점을 제시하여 2차원 이미지와 3차원 모델의 정합 시간을 단축해주는 방법을 제안하였다. 제안 방법의 시간단축 효과를 증명하기 위하여 특징점 제시 위치 정확성 평가 실험과 특징점 제시 방법의 시간 효율평가를 통해 제안 알고리즘의 성능을 평가해본 결과 특징점 제시 방식의 경우 2차원 이미지와 3차원 모델의 확대·축소가 필요 없어 특징점 미제시 방식에 비해 42.6%의 속도 개선 효과를 나타네었다. Worldwide, Trying to get Digital Culture Heritage not only one's own country and other countries because they think it will be valuable thing in the future. Korea follow this trend by scan 3D digital heritage. To insert the material in 3D digital heritage scanned by 3D scanner need designer's work. It spend a lot of time. so this paper suggest extract the feature from 2D image and 3D model rendered image and give it to the designer so it will decrease calibration time. We experiment extraction feature's accuracy and time efficiency. Finally, feature suggest method doesn't need zoom in/out so it decrease 42.6% time.
( Hong Jin Yoon ),( Yong Hoon Kim ),( Jie Hyun Kim ),( Yong Chan Lee ),( Hyunki Kim ),( Hoguen Kim ),( Jae Jun Park ),( Young Hoon Youn ),( Hyojin Park ),( Sung Hoon Noh ),( Seung Ho Choi ) 대한내과학회 2014 대한내과학회 추계학술발표논문집 Vol.2014 No.1
Background: Mixed histology has been reported to show more aggressive behavior than other histologies in early gastric cancer (EGC). We also reported that signet ring cell (SRC) mixed histology showed more submucosal invasion and higher lymph node metastasis (LNM) than others. However, there are no individual criteria for endoscopic resection (ER) in mixed histology. The aim of study was to investigate whether new criteria for mixed histology is necessary for ER in EGC. Methods: From January 2005 to December 2012, 3,419 patients with EGC underwent surgery. Lesions were classifi ed into three histological classifi cations: Japanese classi- fi cation, WHO classifi cation including SRC mixed histology, and Lauren classifi cation. Mixed type in Lauren classifi cation was reclassifi ed into four types according to the proportion of differentiated and undifferentiated components. Clinicopathologic characteristics were compared according to histological classifi cations, special reference to ER criteria. Results: 179 (5.2%) lesions were classified as mixed type in Lauren classification. Among them, 54 (30.2%) lesions were differentiated-predominant mixed type. 361 (10.6%) lesions were classifi ed as SRC mixed histology. Mixed type lesions in Lauren classifi cation and SRC mixed lesions were signifi cantly associated with larger size and higher LNM than others. Among the lesions meeting ER criteria, 20 and 55 lesions were categorized into mixed type in Lauren classifi cation and SRC mixed histology, respectively. However, there was no LNM among the lesions recategorized into mixed histology. Conclusions: Mixed histology in EGC showed higher LNM than other histologies. However, there was no LNM among the lesions meeting the present ER criteria.
View Planning for Occluded Region with Active Imaging System
Hyunki Lee,Hyungsuck Cho,Deokhwa Hong 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Nowadays, a number of 3D shape measurement methods have been developed such as stereo vision, laser structured light, and Phase Measuring Profilometry (PMP). They have many problems such as correspondence problem, 2π-ambiguity and occlusion problem. Among them, occlusion problem is common problem for 3D shape measurement and well known as difficult to solve. To solve this problem, in our previous research, active imaging system is introduced, which can change the viewing angle without changing of field-of-view (FOV), and can do the FOV with maintaining the viewing angle. And to decide the viewing direction and position, view planning algorithm is developed. The performance of our system is checked by simulation and a series of real experiments.
Increased spectral sensitivity of Si photodetector by surface plasmon effect of Ag nanowires
Kim, Hong-Sik,Kumar, Melvin David,Kim, Hyunki,Kim, Joondong Elsevier 2016 Infrared physics & technology Vol.76 No.-
<P><B>Abstract</B></P> <P>Highly-sensitive Si photodetectors were prepared by using Ag nanowires (AgNWs). A transparent indium-tin-oxide (ITO) coating was coated on a Si substrate followed by spin-coating of AgNWs-containing solution. AgNWs having average length of 5–20μm with a diameter of about 40–60nm were observed in FESEM images. The haze effect of AgNWs was totally avoided because of the optimum value of diameter. The transmittance of above 85% was shown by AgNWs over a broad spectral range due to surface plasmon resonance effect. The AgNW-coated device showed an excellent rectifying ratio of 288. Under light illumination, AgNWs-coated device exhibited a significant photoresponse ratio of 5373. This advanced feature of AgNWs-templated method would be applied in broadband wavelength photodetection devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> High-performing NIR photodetector was achieved by using AgNWs. </LI> <LI> Solution process was applied to coat AgNWs on Si. </LI> <LI> Surface plasmon effect significantly enhances the photoresponses. </LI> <LI> AgNW-embedding Si photodetector was effective to suppress reverse current. </LI> </UL> </P>
Sunjoo Hong,Kwonjoon Lee,Unsoo Ha,Hyunki Kim,Yongsu Lee,Youchang Kim,Hoi-Jun Yoo IEEE 2015 IEEE journal of solid-state circuits Vol.50 No.1
<P>A mobile electrical impedance tomography (EIT) IC is proposed for early breast cancer detection personally at home. To assemble the entire system into a simple brassiere shape, EIT IC is integrated via a multi-layered fabric circuit board which includes 90 EIT electrodes and two reference electrodes for current stimulation and voltage sensing. The IC supports three operating modes; gain scanning, contact impedance monitoring, and EIT modes for the clear EIT image. A differential sinusoidal current stimulator (DSCS) is proposed for injection of low-distortion programmable current which has harmonics less than -59 dBc at a load impedance of 2 kΩ. To get high sensitivity, a 6-channel voltage sensing amplifier can adaptively control the gain up to a maximum of 60 dB, and has low input referred noise, 36 nV/ √Hz. The 2.5 × 5 mm chip is fabricated in a 0.18 μm 1P6M CMOS process and consumes 53.4 mW on average. As a result, a sensitivity of 4.9 mΩ is achieved which enables the detection of a 5 mm cancer mass within an agar test phantom.</P>