Publications by authors named "Whoi-Yul Kim"

In an autonomous driving assistance system (ADAS), top views effectively represent objects around the vehicle on a 2D plane. Top-view images are therefore widely used to detect lines in ADAS applications such as lane-keeping assistance and parking assistance. Because line detection is a crucial step for these applications, the false positive detection of lines can lead to failure of the system.

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Article Synopsis
  • The separation of circulating tumor cells (CTCs) from blood is crucial for cancer diagnostics, but existing methods are limited due to tumor diversity.
  • A new slanted weir microfluidic device effectively separates CTCs based on their size and flexibility, achieving a 97% separation efficiency while significantly reducing red and white blood cell counts.
  • An image analysis tool was also developed to analyze different cell shapes and deformability, suggesting that this system could greatly enhance liquid biopsies for cancer research.
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Urine tests are performed by using an off-the-shelf reference sheet to compare the color of test strips. However, the tabular representation is difficult to use and more prone to visual errors, especially when the reference color-swatches to be compared are spatially apart. Thus, making it is difficult to distinguish between the subtle differences of shades on the reagent pads.

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Hydrochromic materials have been actively investigated in the context of humidity sensing and measuring water contents in organic solvents. Here we report a sensor system that undergoes a brilliant blue-to-red colour transition as well as 'Turn-On' fluorescence upon exposure to water. Introduction of a hygroscopic element into a supramolecularly assembled polydiacetylene results in a hydrochromic conjugated polymer that is rapidly responsive (<20 μs), spin-coatable and inkjet-compatible.

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In the vision-based remote gaze tracking systems, the most challenging topics are to allow natural movement of a user and to increase the working volume and distance of the system. Several eye gaze estimation methods considering the natural movement of a user have been proposed. However, their working volume and distance are narrow and close.

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Angular radial transform (ART), which is the region-based shape descriptor of MPEG-7, has desirable properties for representing shape information in a small number of features with no redundancy. However, in order for ART to be useful, especially in limited computing environments, the computational cost of ART must be greatly reduced. In this paper, we derive symmetric/antisymmetric properties from the basis functions of ART and present a fast and efficient method to compute the ART coefficients using these properties.

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In this article, we present a new way of creating annotation objects for DICOM images, using the redundant data channel. Various types of annotations, including types containing color information, are possible and annotation objects can overlap the original DICOM image on a screen. Annotation objects can be created easily using a digital pen.

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