유효미생물에 의한 하수슬러지의 효율적 처리

최충식,주길재,이동훈,최충렬,이인구,최정 경북대학교 농업과학기술연구소 1999 慶北大農學誌 Vol.17 No.-

This study was conducted to evaluate the effects of microbial inoculation on sewage sludge composting. The number and species of microorganisms in sewage sludge sampled on February were higher than those sampled on August. The composting of sewage sludge is inhibited by the polyacrylamide cation, which was used as a coagulant and known to repress the growth of microorganisms. The growth of all microorganisms was inhibited by the addition of the polyacrylamide cation at a concentration of more than 0.8%. The species and viable counts of microorganisms were observed to increase during composting sewage sludge by inoculation of the effective microorganisms and addition of the pine tree sawdust as a bulking agent, compared with those without inoculation. A variety of organisms in compost(sewage sludge plus sawdust) were observed after composting for 30 days, such as Fragilaria sp., Proales sp., Vorticella sp., Schizothrix sp., Anabaena sp., Zoothaminium sp., Epstylis sp., Arcella sp., Balantidium sp., Actinophrys sp., Synedra sp., Euglypha sp., Ulothrix sp., Anacystis sp., and Clostium sp.

Investment in Information Technology and Technology Intensity Measures

Choi,Jeong-Gil 한국관광식음료학회 2003 관광식음료경영연구 Vol.14 No.1

중학교 정보 교과서에서 "문제해결 방법과 절차" 영역의 창의적 문제해결력 경향 분석

김용대 ( Yong Dae Kim ),최길수 ( Gil Su Choi ),이종연 ( Jong Yun Lee ) 한국컴퓨터교육학회 2012 컴퓨터교육학회 논문지 Vol.15 No.1

정보 교과는 지식정보화 사회에 필요한 정보 활용 능력은 물론 창의적인 문제해결력을 함양하기 개설된 교과이다. 그러나 창의적 문제해결요소가 교과서에 어느 정도 포함되었는지를 분석하는 연구는 미미하다. 따라서 본 논문은 중학교 정보 1 교과서 ``문제해결방법 및 절차`` 영역의 창의적 문제해결력 경향을 정량적으로 분석하였다. 정보 교과서가 창의적 문제해결력 함양 요소를 어느 정도 포함하고 있는지 최길수의 정량적 분석법으로 분석한 결과, 교과서별로 문제해결과정 반영과 문제해결전략 제시의 충실도에 차이가 크게 나타났고 모든 교과서가 활동 요구 지수, 창의적 문제해결력 관련지수, 활동 유형지수가 전체적으로는 바람직한 범위에 있으나 소 영역별로는 바람직한 범위를 벗어난 것이 있는 것으로 나타났으며 지수 값이 균형을 이루지 못한 교과서가 있고 활동 유형이 일부 유형에 치우쳐 있는 것으로 나타났다. 그러므로 앞으로 정보 교과서의 개발 및 수정 보완 시 문제해결과정 반영과 문제해결전략의 충실도를 높이고, 교과서의 학습 활동 구성 시 다양한 학습 활동 유형을 활용하고 기본 정신 기능과 고등 정신 기능을 요구하는 활동 비율의 균형을 유지할 것을 제안하였다. Developing middle and high students` information literacy and creative problem-solving skills in this information-oriented society is very important and for this reason, the subject of informatics has been established. However, little research on creative problem solving literacy of informatics textbooks has been conducted. Therefore, the purpose of this paper is to quantitatively analyze whether ``problem-solving methods and procedures`` parts in informatics textbooks in middle schools present creative problem solving literacy or not and in what degree. Data were quantitatively analyzed using the Gil-Su Choi method. The result of data analysis indicated that all the textbooks turned out to be correct range in the category of the "composition of various learning activities," but got out of range in some categories such as "problem-solving process reflection` and "problem-solving strategy proposal". Also a few textbooks haven`t satisfied in important indexes and activities. So, we suggest that more ``problem-solving process reflection`` and ``problem-solving strategy proposal`` parts should be included in the informatics textbook and more various forms of learning activities be utilized well as the ratio of activities needed primary and high mental processes be kept the balance.

ISI 프로토콜에서의 인증에 관한 연구

최길림,이재동,정광민 慶南專門大學 2000 論文集 Vol.28 No.1

감의 脫澁處理中 Pectin 含量과 Texture의 變化

崔鍾旭,孫泰華,鄭信敎,李吉雨,姜峻洙 慶北大學校 1989 論文集 Vol.47 No.-

This experiment was made to investigate the changes of the contents of acetaldehyde, alcohol, tannin, and to study the texture changes of persimmon in relation to the contents of pection during the removal of astringency by CO_2. 1. During the removal of astringency of persimmon fruits, the contents of soluble tannin showed the rapid decrease in high concentration of CO_2, but the contents of ethanol and acetaldehyde showed the rapid increase in all treatments. 2. The contents of W.S.P. increased, but H.S.P. decreased in all treatments. 3. All texture paramenters of persimmon fruits except springness and adhesiveness were decreased druing the removal of astringency. 4. The contents of W.S.P. were good correlated with the changes of hardness in all treatments.

소각 Plant에서 무촉매 환원 장치의 최적반응조건에 관한 연구

최규관,이길영 大田大學校 環境問題硏究所 2002 환경문제연구소 논문집 Vol.6 No.-

A study was conducted for possibility of optimum application of SNCR to the municipal solid waste incinerator in Taejon city. The major test influencing factors are temperature, kinds of reducing agents, NSR(normalized stoichiometric ratio) and injection point of reducing agents. The result of this study was followed The maximum efficiency is 80% at the condition, urea injection, upper stage injection, NSR = 2, and at 950℃. but the operation condition is not stable, so we need another optimum operation condition. Optimum NSR for ammonia is 1.2 and for urea is 1.5. Optimum temperature for two reducing agents is 950℃. Upper stage is better then middle stage for injection point of reducing agents. The most optimum operation condition of SNCR for municipal solid waste incinerator was followed. Reducing efficiency can be reached to 65%, when we use ammonia as a reducing agent at upper stage injection, NSR is 1.2 and operating temperature is 950℃. But reducing efficiency can be upgraded to 75%, at the same condition, beside urea as a rediucing agent and NSR is 1.5. If we can control the operation condition of SNCR with urea as a reducing agent, we can control the emission concentration of nitrogen oxides belows 32ppm.

O₂기반의 XML 저장 관리기 설계 및 구현

최길성,김승연 大田産業大學校 2000 한밭대학교 논문집 Vol.17 No.1

본 논문에서는 XML 문서의 구조적 정보를 표현하는데 적합한 객체지향데이터베이스 관리시스템 O2를기반으로 하는 XML 저장관리기를 설계하고 구현한다. 이를위해 효과적인 XML 문서의 저장과 추출, 이 미지관리 및 수정된 문서들의 버전 관리 등을 지원하는 객체지향 모델링을 제시하고, 이를 이용한 XML 저장관리기를 구현한다. 구현 한 XML 저장관리기는 외부 애플리케이션과의 인터페이스 역할을 하는 저장관리기, XML 문서를 실제로 데이터베이스에 저장하는 XML 인스턴스 저장기, 데이터베이스 내에 저장되어 있는 XML문서에 대한 추출을 담당하는 XML인스턴스 관리기, 문서의 내용 및 구조 정보에 대한 인덱스를 생성하고 관리하는 XML 인덱스 관리기 그리고 질의를 처리하는 질의 처리기로 구성된다. In this paper, we design and implement a XML repository manager(XRM) based on OODBMS that supports structured information retrieval of XML documents. We also propose an object oriented modeling to store and fetch XML documents, to manage image data, and to support versioning for the XRM. The XRM consists of a repository manager that maintains the interfaces for external application programs, a XML instance storage manager that stores XML documents in the database, a XML instance manager that fetches XML documents stored in the database, a XML index manager that creates index for the structure information and the contents of documents, and a query processor that processes various queries.

교대말뚝기초의 측방유동에 관한 원심모형실험

최동혁,정길수,박병수,유남재 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

This paper is an experimental result of investigating lateral soil movements at piled bridge abutments by using the centrifuge model facility. Three different centrifuge model experiments, changing the methods of ground improvement at bridge abutment on the soft clayey soil (no improvement, preconsolidation and plastic board drain (PBD), sand compaction pile (SCP) + PDB), were carried out to figure out which method is the most appropriate for resisting against the lateral soil movements. In the centrifuge modelling, construction process in field was reconstructed as close as possible. Displacements of abutment model, ground movement, vertical earth pressure, cone resistance after soil improvement and distribution of water content were monitored during and after centrifuge model tests. As results of centrifuge model experiments, preconsolidation method with PBD was found to be the most effective against the lateral soil movement by analyzing results about displacements of abutment model, ground movement and cone resistance. Increase of shear strength by preconsolidation method resulted in increasing the resistance against lateral soil movement effectively although SCP could mobilize the resistance against lateral soil movement. It was also found that installment with PBD beneath the backfill of bridge abutment induced effective drainage of excess pore water pressure during the consolidation by embanking at the back of the abutment and resulted in increasing the shear strength of clay soil foundation and eventually increasing the resistance of lateral soil movement against piles of bridge abutment.

보은, 괴산지역 황색종 담배포장의 자갈함량과 전작물별 생육상황 조사

최상진,석영선,배길관 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

This studies were conducted to investigate the growth characteristics by gravel contents and pre-crops of Flue-cured tobacco cultivated fields at Boeun and Koesan county extension. The results were summarized as follows. pH, available phosphorous(P2O5), inorganic nitrogen(NH4-N + NO3-N), organic contents, cation exchanging capacity(C.E.C) were much more at Koesan than those of Boeun. The gravel content were approximately from 20% to 70% and its content was much more containable at Koesan than Boeun. Stalk length, stalk diameter, leaf numbers, dry weight, largest leaf, the length and the width were higher at Koesan than Boeun. The growth of tobacco by pre-crop was higher tobacco fields than pepper fields.

매실박, 당근박, 감귤박 급여가 산란계 난황의 Vitamin E, K 함량에 미치는 영향

최승현,나재천,권오상,박상미,이봉덕,안길환 충남대학교 농업과학연구소 2008 농업과학연구 Vol.35 No.2

This experiment is a quantitative experiment where insoluble Vitamins E and K are extracted from the yolk of the spawning which was fed by by-products of tangerine, carrot, or Japanese apricot. Finally the purpose is to raise contents of the insoluble Vitamins E and K inside the yolk of the spawning. The saponification method through α, α - dipyridyl was used to determine the content of Vitamin E. Diethyl dithiocarbamate assay was used to examine the content of Vitamin K. The contents of Vitamin E in egg yolks of chicken fed by by-products of tangerine, carrot, or Japanese apricot increased 2 - 3 times compared to control egg, while the contents of Vitamin K almost no changed. 본 실험에서는 감귤, 매실, 당근의 껍데기로 감귤박, 매실박, 당근박을 먹여 산란계의 난황에 들어있는 Vitamin E와 K 함량을 높이고자 했다. Vitamin E 추출방법에는 검화방법인 α, α -dipyridyl에 의한 비색정량법을 사용하였으며 전처리 과정 중 석유 ether를 가하여 층을 분리하는 과정과 증류수를 가하여 층을 분리하는 과정에 있어서 신중을 가하였고 신속한 시료 전처리과정이 요구되었다. Vitamin K 추출에는 Diethyl dithiocarbamate에 의한 방법이 사용되었다. 실험결과 일반난황에서의 Vitamin E 함량보다 실험난황에서의 Vitamin E 함량이 2배 이상 높아졌음을 알 수 있었던 반면 Vitamin K의 함량은소량 증가하여 큰 변화가 없었다. 위의 결과를 통해서 난황에 이전된 Vitamin E의 종류가 무엇이며 어떠한 형태의 Vitamin E가 이전이 많이 되었는지를 확인하는 실험이 필요할 것이다. 이러한 추가적인 실험이 이루어졌을 때 상업적으로 이용한 가치가 있는 가를 고려하여야 할 것이다.