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병어, Pampus punctatissimus와 덕대, Pampus argenteus의 외부 계측형질 특성
강희웅(Hee-Woong KANG),한종철(Jong-Cheol HAN),진영국(Young-Guk JIN),이경미(Kyung-Mi LEE),정연민(Yeon-Min JEONG) 한국수산해양교육학회 2021 水産海洋敎育硏究 Vol.33 No.4
The external morphometric characteristics of silver pomfret, Pampus punctatissimus and Korean pomfret, P. argenteus of Stomateidae in Korea were investigated through direct distance. The 16 measurements were expressed as a ratio to the total length, resulting in 8 measurements of P. punctatissimus were found to be larger than those of the P. argenteus (p<0.05). The factors by components in the morphometric characteristics were extracted into three sub-factors, among which factor 1 was length component of species division, factor 2 was length component of body shape, and factor 3 was length component of pectoral section. As for the correlation between the length factor between P. punctatissimus and P. argenteus, DFL-DH showed the highest positive correlation by 0.923. The most remarkably distinguishable factor for the morphometric trait of Stomateidae was the length in dorsal and anal fin shapes, DH and AH, which were longer in the P. punctatissimus than in P. argenteus.
조민국(Min Kook Cho),윤한빈(Han Bean Youn),손철순(Cheol-Soon Shon),한종철(Jong Chul Han),윤승만(Seung Man Yun),임창휘(Chang Hwy Lim),김호경(Ho Kyung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
We have developed a cost-effective micro-tomography (micro-CT) system. The system consists of an x-ray source with small focus spot, an object (or subject) jig, and an x-ray imaging detector. A computer-controlled rotation system was adopted in the object jig to achieve a cone-beam mode scan. The core of the system is an x-ray imaging detector. Since imaging performance of the detector is mostly responsible for the resultant image quality and eventually determines the quality of a tomogram, characterization of the imaging performance of the detector is an important issue for optimizing the design of the imaging system. We have evaluated the imaging characteristics of the detector in terms of modulation-transfer function (MTF), noise-power spectrum (NPS), and detective quantum efficiency (DQE). The details of experimental results will be discussed with the system's own limitations. The potential performance of the system is demonstrated with the initially acquired test images.
컴퓨터 원용 결함진단을 위한 그래픽 솔루션 개발에 관한 연구
윤한빈(Hanbean Yoon),윤승만(Seungman Yun),한종철(Jong Chul Han),조민국(Min Kook Cho),임창휘(Chang Hwy Lim),허성근(Sung Kyn Heo),손철순(Cheol-Soon Shon),김성식(Seong-Sik Kim),이석희(Seok-Hee Lee),이석(Suk Lee),김호경(Hokoung Kim) 한국비파괴검사학회 2009 한국비파괴검사학회지 Vol.29 No.1
역공학의 한 방법으로 엑스선 전산 단층촬영 장치에서 획득한 삼차원 데이터를 CAD(computeraided design) 데이터로 변환하여 쾌속조형 모델을 제작할 수 있고, 또한 삼차원 가시화를 통해 피검사체의 오차를 확인하고 분석할 수 있는 알고리즘들에 대한 연구를 수행하였다. 연구 결과를 바탕으로 GUI(graphical user interface) 기반의 소프트웨어를 개발하였다. 개발한 소프트웨어의 검증을 위하여 산업 및 의료용 샘플들에 대한 전산 단층촬영 스캐닝을 수행하고 CAD 데이터 변환 및 컴퓨터 원용 결함진단 시뮬레이션을 수행하였다. 이를 통해 컴퓨터 원용 결함진단의 산업 및 의료분야 적용 가능성을 확인하였다. We have developed software for converting the volumetric voxel data obtained from X-ray computed tomography(CT) into computer-aided design(CAD) data. The developed software can used for non-destructive testing and evaluation, reverse engineering, and rapid prototyping, etc. The main algorithms employed in the software are image reconstruction, volume rendering, segmentation, and mesh data generation. The feasibility of the developed software is demonstrated with the CT data of human maxilla and mandible bones.
실내에서 사육한 양식산 수조기, Nibea albiflora의 자연산란과 난질
강희웅(Hee-Woong KANG),황인준(In Joon HWANG),한종철(Jong Cheol HAN),이경미(Kyung Mi LEE) 한국수산해양교육학회 2022 水産海洋敎育硏究 Vol.34 No.5
This study investigated the characteristics of natural spawning and egg quality from indoor-cultured broodstock yellow drum. The size of cultured broodstock was 37.6±3.3 cm in total length and 698.7±214.7 g in body weights, and the relationship between body weight (BW) and total length (TL) was expressed as BW=0.0014TL<SUP>3.6075</SUP> (r²=0.9637). The condition factor (CF) showed the highest value in May (20.3±3.7), then it decreased gradually since May and showed the lowest value in October (15.2±2.2), CF gradually decreased after the spawning period. Natural spawning of cultured broodstock (3 years old) was observed four times from July 9 to 17. It occurred when the water temperature increased and day length decreased, and the egg diameter became smaller as spawning is progressed. The floating rate, egg diameter and oil droplet diameter, hatching rates were 96.86±3.62%, 778±41 ㎛, 255±23 ㎛ and 67.50±24.51%, respectively. The length of newly hatched larvae was 1.62±0.25 mm.