일라이트 분체 내에 함유된 산화철 제거에 옥살산과 L-아스코르브산이 미치는 영향

이원표,강일모,문희수,Lee, Won-Pyo,Kang, Il-Mo,Moon, Hi-Soo 대한자원환경지질학회 2007 자원환경지질 Vol.40 No.2

충북 영동지역에서 산출되는 일라이트를 대상으로 철 성분을 제거하는 실험을 수행하였다. 이는 일라이트 광석에 들어있는 철 성분을 제거하여 백색도를 향상시킴으로써 광석의 활용 가능성을 높여 주는데 있다. 철 성분의 제거 효율성을 평가하기 위해 무기산(황산, 염산), 유기산(L-아스코르브산, 옥살산), 혼합산(무기산+유기산)을 사용하였다. 실험결과 0.15 M L-아스코르브산을 0.5 N 황산에 첨가한 혼합산과의 탈철 반응을 수행한 경우, 60분 반응 시 1.5 wt%의 산화철 성분을 제거하여 가장 높은 효율을 나타내었다. 0.5N황산을 단독으로 사용한 경우에는 60분 반응 시 제거된 산화철이 0.68%에 불과하다. 황산만을 이용하여 1.5wt %의 산화철을 제거하기 위해서는 5N의 반응농도와 150분의 반응시간이 요구되었다. 따라서 친환경적이고, 인체친화적인 L-아스코르브산의 탈철반응이 반응농토와 반응시간에 있어서도 효율적임을 관찰하였다. 산화철 제거 후 일라이트는 백색도가 42%에서 75%로, 색도가 10YR 8/4에서 5Y, 8/1로 향상되어 CBD 처리와 같은 수준으로 증가하였다. 일라이트 입자를 교결하고 있던 산화철이 제거되어 입도가 소폭 감소하였으나 광물학적/물리 화학적 특성은 변화가 관찰되지 않았다. This study was focused on iron removal from illite by L-ascorbic and oxalic acids. Iron has been shown as a secondary mineral such as iron oxides and hydroxides in illite ores. It is also known as a primary agent to degrade brightness index of the ores. Methods such as physical separation and chemical leaching with strong inorganic acids have been widely used to remove the iron from the ores. However, these methods are expensive and give rise to environmental problems. In this study, we examined an alternative method using solutions with different set of combination of sulfuric, hydrochloric, L-ascorbic, and oxalic acids. Compared to chemical treatments with only inorganic acids, our results demonstrate that an addition of L-ascorbic acid in inorganic acids results in decreasing both total concentrations of the inorganic acids and time for the treatments. The treatment with 0.15 M L-ascorbic acid and 0.25 M sulfuric acid in solution for 60 min significantly improved the brightness index from 42.4% to 74.4%. This improvement is similar to that of treatment with only 2.5 M sulfuric acid alone for 150 min. Mineralogical and chemical analyses were performed to compare the effect of acid leaching on illite powders. No obvious differences are observed in the mineralogical characteristics and particle size distributions of the samples. These results suggest that the treatment with the addition of L-ascorbic acid in sulfuric acid could effectively remove iron without modifying the physicochemical properties of illite under conditions used in this study.

분할연산을 이용한 고속 2차원 DCT 설계

이원표,안덕철,김희석 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.17 No.2

In this paper, designed a high speed 2-dimensional DCT(Discrete Cosine Transform) design using the distributed arithmetic system applicable to MPEG, JPEG, H26x system for image data compression. This system is using the DA, vector processing and pipeline. Designed in this paper, consists of datapath unit and controller. This system is compared to the pipelined 2-D DCT. As the result, This system processes 12 frames/sec for 720 × 480 size, therefore, that This system is prior to pipelined 2-D DCT system was found.

미국 콘크리트 산업의 비젼

이원표,김광수 한국콘크리트학회 2002 콘크리트학회지 Vol.14 No.6

파이프라인 IDCT 설계에 관한 연구

이원표,전종식,김희석 청주대학교 산업과학연구소 1999 産業科學硏究 Vol.17 No.1

In this paper, IDCT that can decode still and moving image is designed. For high performance of data processing, this system is applied pipelined architecture to IDCT system, designed in this paper, consists of datapath, controller and clock generator, and in order to test design area, processing time and power consumption, this system is compared the sequential IDCT system. As the result, the pipelined IDCT system processes 14 frames/sec for 352 × 240 size, therefore, that the pipelined IDCT system is prior to sequential IDCT system was found.

현장의 소리 : 전쟁을 넘어서서 평화를 꿈꾼다

이원표 한국정치연구회 2005 정치비평 Vol.14 No.-

공무원의 스포츠 참여 실태조사 및 스포츠 참여 장애요인에 관한 연구

이원표,부기원 江原大學校附設體育科學硏究所 2004 江原大學校附設體育科學硏究所論文集 Vol.- No.27

The purpose of this study was to survey and analyze the response of civil servants on the participation in sports activities and the cause of barrier in sprots participation with 400 civil servants (female:100, male:300) on the Yangpyong city in Kyongki province were answered by the questionnaire. Analysis of the data with 376(female:90, male:286) for the evaluation of the questionnaire can be acquired the more basis materials of sports environment for the civil servants. As result, we have the conclusion as follow. 1. The participation in sports activities among civil servants. The servey of the participation in sports activities among civil servants is as follows. The frequency of playing sports is 1∼2 in a week. The time last 30min.∼1hr. The preferance time is in the aftermoon. The major reason of playing sports is promotion of health. The most popular sports is jogging and marathon. 2. The cause of barrier in sports participation among civil servants is as follows in order. 1) Dissatisfaction of sports program 2) Difficulty of approach to sports club 3) Insufficiency of social support 4) Shortage of time 5) Low nterest in sports 6) Enerfation 7) Shortage of physical strength.

중 · 고등학생의 스포츠참여 장애요인에 관한 연구

이원표,부기원 江原大學校附設體育科學硏究所 2002 江原大學校附設體育科學硏究所論文集 Vol.- No.25

The purpose of this study was to survey and analyze the response of middle, high-school students on the barriers to exercise and sport with 600 students(male:330, female:270) on the yangpyong city in kyongki province were answered by the questionnaire. Analysis of the data with 565(male:311, female:254) for the evaluation of the questionnaire can be acquired the more basis materials of sports environmnet for the middle, high-school students. As result, we have the conclusion as follow. 1. In their sex and factor of sport barriers. male is a bar to according to priority sport program(3.05), sport club(3.00), financial support(2.91), social support(2.85), time shortage(2.73), different concern(2.34), enervation (2.13), health/physical strength(2.03) female is a bar to according to priority sport program(3.30), sport club(3.04), time shortage(2.96), different concern(2.95), social support(2.88), financial support(2.84), enervation (2.59), health/physical strength(2.14) 2. In their grade and factor of sport barriers, middle-school students is a bar to according to priority sport program(3.04), sport club(2.95), different concern(2.80), social support(2.75), financial support(2.74), time shortage(2.65), enervation(2.40), health/physical strength(2.25) high-school students is a bar to according to priority sport program(3.19), sport club(3.04), financial support(2.91), social support(2.98), time shortage(2.88), different concern(2.56), enervation(2.32), health/physical strength(2.04) 3. In their department and factor of sport barriers, an academic high school is a bar to according to priority sport program(3.17), time shortage(3.13), sport club(3.09), financial support(2.96), social support(2.91), different concern(2.50), enervation(2.34), health/physical strength(1.95)an business(industrial) high school is a bar to according to priority sport program(3.21), sport club(2.99), financial support · social support(2.87), time shortage(2.64), different concern(2.63), enervation(2.29), health/physical strength(2.11) 4. There are no difference in their parent's scholastic ability and factor of sport barriers. 5. In general, their sex, grade, department, parent's scholastic ability and factor of sport barriers is a bar to according to priority sport program, sport club, social support. As a result of analysis, in order to participate of sport, physical education activity and sport program expansion is necessary

상위 수준에서의 MDCT/IMDCT 구현

이원표,김희석 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.22 No.3

In this paper, we implement the Modified Discrete Cosine Transform(MDCT)/Inverse MDCT(IMDCT) in MPEG audio layer 3 using HW(Hardware)/SW(Software) Co-Design methodology. The computation process of the MDCT/IMDCT is most intensive in MPEG audio layer 3. Therefore, it is very important that the MDCT/IMDCT must be implemented in HW. The eXCite in YXI Co., which inputs ANSI-C language as high-level description and outputs VHDL or(and) Verilog-HDL file in HW/SW Co-Design. As the result to simulate our design, the MDCT/IMDCT are operated in 68MHz on Stratix chip in ALTERA and in 20MHz on Excalibur chip for SoC Design

대전광역시 재활용센터 운영의 난맥상

이원표,Lee, Won-Pyo 한국건설자원협회 2006 녹색21 Vol.10 No.-

두가지 분열문(Cleft sentence) : 그 비양립성

이원표 연세대학교 영어영문학과 1983 영어영문학연구 Vol.7 No.-