Ju Wan Kim

Fabrication of vitreous carbon grid structures by carbonization of 3D printed parts for water-oil separation

Ju Wan Kim, Chanwoo Kim, Hyunjin Na, Seongmin Lee et autres

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Hierarchical mesh-type oxygen electrode using carbon nanotube framework for anion-exchange membrane-based unitized regenerative fuel cells

Kyungbeen Yeom, Sungeun Heo, Yoojin Shin, Ju Wan Kim et autres

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Dual Hierarchical Aggregation Network based Enhanced Shadow Detection and Removal

Ju Wan Kim, In Sung Jang

3D 공간정보, 가상/증강현실, 스마트시티와 같은 정보통신기술이 발전함에 따라 실세계 도시와 같은 가상 3D 도시모델에 대한 요구가 증가하고 있으며, 사실적인 3D 도시모델을 구축하기 위하여 항공사진 등 실제 사진을 텍스쳐로 활용하고 있다. 그러나 실제 도시를 촬영한 사진에 포함된 그림자는 3D 도시모델의 현실감과 몰입감을 떨어뜨리는 …

Angiographic Imaging of an In Vivo Mouse Brain as a Guiding Star for Automatic Digital Refocusing in OCT

Kwan Seob Park, Ju Wan Kim, Byeong Ha Lee, Tae Joong Eom

A method allows the extraction of the recovery factor that maximizes the image contrast of OCT (optical coherence tomography) and/or OCTA (OCT angiography) of a living subject is proposed in this study. Due to the finite depth of focus in imaging optics, …

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CNN-based Shadow Detection Method using Height map in 3D Virtual City Model

Hee Jin Yoon, Ju Wan Kim, In Sung Jang, Byung-Dai Lee et autres

Autofocus Tracking System Based on Digital Holographic Microscopy and Electrically Tunable Lens

Ju Wan Kim, Byeong Ha Lee

We present an autofocus tracking system implemented by the digital refocusing of digital holographic microscopy (DHM) and the tunability of an electrically tunable lens (ETL). Once the defocusing distance of an image is calculated with the DHM, then the focal plane of …

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Analysis of Design and Fabrication Parameters for Lensed Optical Fibers as Pertinent Probes for Sensing and Imaging

Soongho Park, Sunghwan Rim, Ju Wan Kim, Jinho Park et autres

A method for adjusting the working distance and spot size of a fiber probe while suppressing or enhancing the back-coupling to the lead-in fiber is presented. As the optical fiber probe, a lensed optical fiber (LOF) was made by splicing a short …

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Magnification-invariant surface profiling technique for structured illumination imaging and microscopy

Ju Wan Kim, Jae Sung Ahn, Joo Beom Eom, Byeong Ha Lee

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Frequency domain zero padding for accurate autofocusing based on digital holography

Jun Geun Shin, Ju Wan Kim, Tae Joong Eom, Byeong Ha Lee

The numerical refocusing feature of digital holography enables the reconstruction of a well-focused image from a digital hologram captured at an arbitrary out-of-focus plane without the supervision of end users. However, in general, the autofocusing process for getting a highly focused image …

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A three-dimensional scanning apparatus based on structured illumination method and its application in dental scanning

Jae Sung Ahn, Anjin Park, Ju Wan Kim, Byeong Ha Lee et autres

We demonstrated a three-dimensional (3D) dental scanning apparatus based on structured illumination. A liquid lens was used for tuning focus and a piezomotor stage was used for shift of structured light. A simple algorithm, which detects intensity modulation, was used to perform …

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Development of Three-Dimensional Dental Scanning Apparatus Using Structured Illumination

Jae Sung Ahn, Anjin Park, Ju Wan Kim, Byeong Ha Lee et autres

We demonstrated a three-dimensional (3D) dental scanning apparatus based on structured illumination. A liquid lens was used for tuning focus and a piezomotor stage was used for the shift of structured light. A simple algorithm, which detects intensity modulation, was used to …

kr (code pays fourni par la source)

Accurate reconstruction of digital holography using frequency domain zero padding

Jun Geun Shin, Ju Wan Kim, Jae Hwi Lee, Byeong Ha Lee

We propose an image reconstruction method of digital holography for getting more accurate reconstruction. Digital holography provides both the light amplitude and the phase of a specimen through recording the interferogram. Since the Fresenl diffraction can be efficiently implemented by the Fourier …

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