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In vitro fertilization using sex-sorted boar sperm mediated by magnetic nanoparticles
Hakjae Chung,Sunyoung Baek,Soojin Sa,Youngshin Kim,Joonki Hong,Eunseok Cho,Jihwan Lee,Seungmin Ha,Jungho Son,Seunghwan Lee,Inchul Choi,Kyungwoon Kim 충남대학교 농업과학연구소 2020 Korean Journal of Agricultural Science Vol.47 No.4
Kwangdon Kim,Hakjae Lee,Jinwook Jang,Yonghyun Chung,Donghoon Lee,Chanwoo Park,Jinhun Joung,Yongkwon Kim,Kisung Lee 대한전자공학회 2017 IEIE Transactions on Smart Processing & Computing Vol.6 No.1
Radioactive materials are used in medicine, non-destructive testing, and nuclear plants. Source localization is especially important during nuclear decommissioning and decontamination because the actual location of the radioactive source within nuclear waste is often unknown. The coded-aperture imaging technique started with space exploration and moved into X-ray and gamma ray imaging, which have imaging process characteristics similar to each other. In this study, we simulated 21x21 and 37x37 coded aperture collimators based on a modified uniformly redundant array (MURA) pattern to make a gamma imaging system that can localize a gamma-ray source. We designed a 21x21 coded aperture collimator that matches our gamma imaging detector and did feasibility experiments with the coded aperture imaging system. We evaluated the performance of each collimator, from 2 mm to 10 mm thicknesses (at 2 mm intervals) using root mean square error (RMSE) and sensitivity in a simulation. . In experimental results, the full width half maximum (FWHM) of the point source was 5.09° at the center and 4.82° at the location of the source was 9°. We will continue to improve the decoding algorithm and optimize the collimator for high-energy gamma rays emitted from a nuclear power plant.
Digestibility of phosphorous in cereals and co-products for animal feed
Park, Sungkwon,Cho, Eunseok,Chung, Hakjae,Cho, Kyuho,Sa, Sujin,Balasubramanian, Balamuralikrishnan,Choi, Taejeong,Jeong, Yongdae Elsevier 2019 Saudi journal of biological sciences Vol.26 No.2
<P><B>Abstract</B></P> <P>Feed ingredients used in swine diets contain various levels and availabilities of nutrients. Nutritional precision evaluation of each ingredient is necessary for formulating diets of pigs. Especially, phosphorous (P) is one of important nutrients for metabolism. However, current data of P digestibility were most apparent digestibility. Therefore, this study was aimed to estimate the coefficient of total tract standardized digestibility (CTTSD) of P in cereals and various co-products used in pig diet. Twelve barrows (initial BW ± SD, 46.70 ± 3.21 kg) were used in this experiment. The experimental design was a 12 × 8 incomplete Latin square with 12 diets and 8 periods. Experimental diets were consisted of barley, wheat, lupine kernel (LK), soybean meal (SBM), almond meal (AM), corn gluten meal (CGM), corn gluten feed from China (CGF-C), corn gluten feed from Korea (CGF-C), wheat bran (WB), rice bran (RB), lupine hull (LH) and P-free diet. The CTTAD of Ca was higher in AM than RB and CGF-K. The LK and CGM showed greater CTTSD of P than RB and LH. In conclusion, our results indicated that the cereals and co-products as P sources were the ideally used as an ingredient in mixed diets of the growing-finishing pigs.</P>
Development of Compact, Cost-effective, FPGA-Based Data Acquisition System for the iPET System
Min, Eungi,Kim, Kwangdon,Lee, Hakjae,Kim, Hyun-Il,Chung, Yong Hyun,Kim, Yongkwon,Joung, Jinhun,Kim, Kyeong Min,Joo, Sung-Kwan,Lee, Kisung Springer-Verlag 2017 Journal of medical and biological engineering Vol.37 No.6
<P>Positron emission tomography (PET) is a nuclear medicine imaging technology used to analyze physiological processes. An in-beam PET is used to verify the delivered dose during ion-beam therapy. Our group investigates the prototype C-shaped PET system, which is called the iPET system. In this study, we develop an expendability-enhanced field-programmable gate array (FPGA)-based data acquisition system for the iPET. We organize this data acquisition (DAQ) system using only one DAQ board, to ensure a compact and cost-effective DAQ system. We design the FPGA using modular functions, which include synchronization, deserialization, pulse height analysis, and data packaging functions. As a result, energy spectra and well-separated 9 x 9 flood images of the entire detector module are achieved. We obtain reconstructed PET images of point source (4 mm diameter), three cylindrical phantoms (3 cm diameter), and four sphere phantoms (3.0, 2.2, 1.3 and 1.0 cm diameter). We achieve approximately 300 kcps of maximum single count rate. The obtained results prove the compactness and cost-effectiveness of the proposed DAQ system.</P>
무결성 보장을 위한 AES-CCM 기반의 멀티미디어 데이터 보호
이은지 ( Eun-ji Lee ),김학재 ( Hakjae Kim ),이성주 ( Sung-ju Lee ),정용화 ( Yongwha Chung ) 한국정보처리학회 2009 한국정보처리학회 학술대회논문집 Vol.16 No.1
대용량의 MPEG 비디오 스트림을 보호하고 암호화의 연산량을 줄이기 위한 방법으로 몇 가지 부분 암호화 기법이 보고되었다. 그러나, 멀티미디어 데이터의 무결성을 보장하기 위해서는 암호화 표준으로 이용되고 있는 HMAC 등의 메시지 인증 기법을 추가적으로 적용할 필요가 있다. 본 논문에서는 현재 암호화 표준으로 이용되고 있는 CCM을 이용하여 멀티미디어 데이터의 무결성을 보장하는 시스템을 제안한다. 또한, 제안한 시스템은 인코딩 및 디코딩의 실시간 요구사항을 만족하기 위하여 부분 암호화 기법으로 이용되는 SECMPEG 보안레벨 3와 호환이 이루어지도록 CCM을 MPEG의 계층적 구조를 고려하여 적용한다. 실험 결과를 통하여 제안 방법은 멀티미디어 데이터의 기밀성 및 무결성을 보장하면서 실시간 처리 성능을 제공함을 확인하였다.
양전자 방출 단층 영상장치의 시스템 구조 및 촬영대상에 특화된 반복적 사이노그램 공백 보간 방법
김광돈(Kwangdon Kim),이기성(Kisung Lee),이학재(Hakjae Lee),정용현(Yonghyun Chung),주성관(Sungkwan Joo) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
Various geometries have been used to develop the positron emission tomography (PET) scanner in order to improve PET image resolution, and to detect events with higher sensitivity. However, the blind zones or inter-detector gaps for each detector block result in various artifacts and image distortions in reconstruction images. To compensate for this distortion, the literature offers several gap-filling methods, such as linear interpolation methods and iterative gap-filling methods. Uygar Tuna et al. proposed a novel gap-filling algorithm that shows superior gap-filling results, which can be attributed to the PET scanner geometry. However, the algorithm is not dedicated to imaging objects, and should be manually optimized for these objects. We aim to develop a gap-filling algorithm, in particular the filter mask design method of the algorithm, which optimizes the filter to the imaging object by an adaptive and iterative process, rather than by manual means. We generated the data set with two analytic phantom studies, Shepp-Logan and Jaszczak. The proposed algorithm shows results that compare to those of the manually optimized discrete-cosine transform 2 (DCT2) algorithm without perfect or full information of the imaging object, and improve the image quality of the reconstructed image.
백한솔(Hansol Baek),정연우(Yeonwoo Chung),주미소(Miso Ju),정용화(Yongwha Chung),박대희(Daihee Park),김학재(Hakjae Kim) 한국멀티미디어학회 2016 멀티미디어학회논문지 Vol.19 No.8
To reduce huge losses in pig farms, weaning pigs with weak immune systems are required to be carefully supervised. Even if various researches have been performed for pig monitoring environment, segmenting each pig from touching-pigs is still entrenched as a difficult problem. In this paper, we propose a segmentation method for touching-pigs by using concave-points and edge information in a video surveillance system. Especially, we interpret the segmentation problem as a time-series analysis problem in order to identify the concave-points generated by touching-pigs. Based on the experimental results with the videos obtained from a domestic pig farm, we believe that the proposed method can accurately segment the touching-pigs.
박창현 ( Changhyun Park ),김진성 ( Jinseong Kim ),김희곤 ( Heegon Kim ),정용화 ( Yongwha Chung ),박대희 ( Daihee Park ),김학재 ( Hakjae Kim ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
국내 돈사 환경에서 돼지들의 세밀한 관리를 위해, 개별 돼지 관리를 자동화하는 방법이 필요하고, 개별 돼지 관리를 위해서는 근접한 돼지들을 개별 돼지들로 구분이 우선적으로 수행되어져야 한다. 영역 기반의 정보를 사용하여 개별 돼지를 구분하는 기존 방법으로는 복잡한 상황에서 개별 돼지로의 분리가 정확하게 되지 않는 문제가 발생한다. 본 논문에서는 이러한 문제를 해결하기 위한 방법으로 움직임 정보를 활용하여 근접 돼지를 분리하고 추적하는 방법을 제안한다. 이전 프레임의 움직임 정보를 계산하여 현재 돼지의 위치 및 방향을 예측하고, 예측된 돼지의 정보를 사용하여 근접한 돼지를 분리하고 추적한다. 실험 결과, 실제 돈사에서 획득한 근접 돼지 시퀀스에서 근접 돼지의 분리 및 추적이 가능함을 확인하였다.