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김승덕 ( Seung Deok Kim ),정동건 ( Dong Geon Jung ),권순열 ( Soon Yeol Kwon ),최영찬 ( Young Chan Choi ),이재용 ( Jae Yong Lee ),구성모 ( Seong Mo Koo ),공성호 ( Seong Ho Kong ) 한국센서학회 2020 센서학회지 Vol.29 No.2
Total organic carbon (TOC) analysis equipment, which was previously used to prevent eutrophication in advance, is heavy, bulky, and expensive; therefore, so it is difficult to be carried and has been used as an experimental unit. In this study, a through-carbon analysis chip that integrates pretreatment through photocatalytic oxidation and carbon dioxide measurement using a pH indicator was investigated. Both the total carbon - inorganic carbon method and the nonpurgeable organic carbon (NPOC) measurement method require an acidification part for injecting an acid solution for inorganic carbon measurement and removal, an oxidation part for total carbon or NPOC oxidation and a measurement part for Carbon dioxide (CO<sub>2</sub>) measurement. Among them, the measurement of oxidation and CO<sub>2</sub> requires physical technology. The proposed TOC analysis chip decomposed into CO<sub>2</sub> as a result of the oxidizing of organic carbon using a photocatalyst, and the pH indicator that was changed by the generated CO<sub>2</sub> was optically measured. Although the area of the sample of the oxidation part and the pH indicator of the measurement part were distinguished in an enclosed space, CO<sub>2</sub> was quantified by producing an oxidation part and a measurement part that shared the same air in one chip. The proposed TOC analysis chip is less expensive and smaller, cost and size are disadvantages of existing organic carbon analysis equipment, because it does not require a separate carrier gas to transport the CO<sub>2</sub> gas in the oxidation part to the measurement part.
초등학교 지적장애 학생들의 축구활동 프로그램이 적응행동 및 이동운동 기술에 미치는 영향
노승덕(Roh, Seung-Dock),김창모(Kim, Chang-Mo),하인숙(Ha, In-Sook),김공(Kim, Kong) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.6
This thesis aims at grasping an influence on adaptative behaviors and moving sports techniques of foot ball activity programs for intellectually disordered elementary school students and at offering effective foot ball activity programs. So, this thesis selected experimental group students and control group students as a studying object, intellectually disordered 10 students respectively, performed studies two times a week for 16 weeks, total 32 times, and acquired the result as followings. First, foot ball activities had a significant difference statistically in conceptual adaptative activities, social adaptative activities, and practical adaptative activities. Second, foot ball activities had a significant difference statistically in moving sports techniques such as intellectually disordered students’ run, gallop, hop, standing long jump, and slide.
이인석(Inseok Lee),모승민(Seung?Min Mo),공용구(Yong?Ku Kong),송영웅(Young Woong Song),정명철(Myung?Chul Jung) 대한인간공학회 2009 大韓人間工學會誌 Vol.28 No.4
The purpose of this study was to evaluate the legibility of one-syllable Korean characters with the participation of sixteen subjects. The experiment considered nine factors including age (young and old), gender (male and female), illuminance (150lx and 600lx), viewing distance (50㎝ and 200㎝), material type (paper and LCD), typeface (Ming and Gothic), thickness (plain and bold), color contrast (black letter/white background and white letter/black background), and complexity (simple, complex, and number) to examine main effects with a 2<SUP>6-3</SUP>×3 fractional factorial design. The dependent variables were minimum character size of 100% correctness, maximum character size of 0% correctness, and minimum character size of comfortable reading preference. The results of analysis of variance (ANOVA) revealed that age, illuminance, viewing distance and complexity were significant for all dependent variables, except gender which was significant only for the minimum character size of comfortable reading preference. In general, the young could see twofold smaller size letters than the elderly. The subjects could see smaller sized letters with the illuminance of 600lx and viewing distance of 50㎝ than 150lx and 200㎝, respectively and also with numbers, simple characters, and complex characters in that order. The findings of this study could be characterized about the legibility of Korean characters and be good resources for developing its standard.
An investigation of the properties of Cu-Be-x alloys prepared by horizontal continuous casting
홍현선,Man Sik Kong,Neung-Mo Sung,Seung Yun Lee,Kyung Min Kim 한양대학교 세라믹연구소 2007 Journal of Ceramic Processing Research Vol.8 No.3
The effects of the solid solution and aging treatment on the microstructure, hardness and electrical conductivity of Cu alloys containing 0.7 wt% and 1.8 wt% Be were investigated. These Cu-Be alloys contain Co, Si, Ni and Mn as alloying elements. An horizontal continuous casting process was applied to obtain unidirectionally solidified billets. A solid solution treatment of the sample was carried out at 865 oC and aging treatments were performed in the range 270-550 oC. For the Cu-1.8 wt% Be alloys, the electrical conductivity generally increased as the aging temperature increased in the range of 270-370 oC. For the Cu-0.7 wt% Be alloys, the electrical conductivity increased as the aging time increased in the range of 10-180 min. The effects of the solid solution and aging treatment on the microstructure, hardness and electrical conductivity of Cu alloys containing 0.7 wt% and 1.8 wt% Be were investigated. These Cu-Be alloys contain Co, Si, Ni and Mn as alloying elements. An horizontal continuous casting process was applied to obtain unidirectionally solidified billets. A solid solution treatment of the sample was carried out at 865 oC and aging treatments were performed in the range 270-550 oC. For the Cu-1.8 wt% Be alloys, the electrical conductivity generally increased as the aging temperature increased in the range of 270-370 oC. For the Cu-0.7 wt% Be alloys, the electrical conductivity increased as the aging time increased in the range of 10-180 min.
이산 웨이블릿 변환과 명암도 동시발생 행렬을 이용한 컬러 레이저프린터 판별 알고리즘
백지연,이흥수,공승규,최정호,양연모,이해연,Baek, Ji-Yeoun,Lee, Heung-Su,Kong, Seung-Gyu,Choi, Jung-Ho,Yang, Yeon-Mo,Lee, Hae-Yeoun 한국정보처리학회 2010 정보처리학회논문지B Vol.17 No.3
고성능 저가의 디지털 인쇄기기의 출현으로 불법적인 위변조가 사회적인 문제로 대두되고 있고, 이를 해결하기 위해서 디지털 포렌식 기술이 필수적이다. 본 논문에서는 컬러 디지털 인쇄기기를 판별하기 위한 디지털 포렌식 기술을 제안한다. 컬러 디지털 인쇄기기는 제조사마다 인쇄방법이 다르기 때문에, 출력물에 작은 차이가 존재한다. 이와 같은 차이점을 활용하면, 임의의 주어진 출력물에 대해 어떠한 인쇄기기로 출력되었는지 구별이 가능하다. 제안하는 방법에서는 차이점을 구별하기 위하여 출력물을 스캔한 디지털 이미지에 대해 이산 웨이블릿 변환을 수행하여 계산한 고주파 영역을 추출한다. 이에 대해 명암도 동시발생 행렬을 계산한 후에 행렬 데이터의 표준편차, 첨도, 왜도, 공분산, 상관계수의 특징을 추출하였다. 추출된 특징을 서포트 벡터 머신 분류기에 적용하여 디지털 인쇄기기를 판별하였다. 제안한 알고리즘의 성능을 분석하기 위하여 총 2,597장 이미지와 7대 프린터(HP, Canon, Xerox DCC400, Xerox DCC450, Xerox DCC5560, Xerox DCC6540, Konica)를 가지고, 기존 알고리즘과 비교 분석하였다. 그 결과에 따르면 제안한 알고리즘은 컬러 디지털 인쇄기기를 판별하는데 있어서 평균 96.9% 정확률을 보였다. High-quality and low-price digital printing devices are nowadays abused to print or forge official documents and bills. Identifying color laser printers will be a step for media forensics. This paper presents a new method to identify color laser printers with printed color images. Since different printer companies use different manufactural systems, printed documents from different printers have little difference in visual. Analyzing this artifact, we can identify the color laser printers. First, high-frequency components of images are extracted from original images with discrete wavelet transform. After calculating the gray-level co-occurrence matrix of the components, we extract some statistical features. Then, these features are applied to train and classify the support vector machine for identifying the color laser printer. In the experiment, total 2,597 images of 7 printers (HP, Canon, Xerox DCC400, Xerox DCC450, Xerox DCC5560, Xerox DCC6540, Konica), are tested to classify the color laser printer. The results prove that the presented identification method performs well with 96.9% accuracy.