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.

Ras 단백질 Cysteine Carboxyl Methyltransferase의 특성에 관한 연구

崔暉英,朴光淑,朴吉洪,柳總根 고려대학교 의과대학 1993 고려대 의대 잡지 Vol.30 No.1

To understand the mechanism by which ras oncoprotein exhibits its physiological guanine nucleotide triphosphatase (GTPase) activity and pathological influence such as carcinogenesis, in depth knowledge on posttranslational processing is underscored. In the context, we focus on the biological role of enzymatic carboxyl methylation of C-terminal cysteine in ras family protein. Characterization of ras-protein cysteine carboxyl methyltransferase is the current objectives. Membrane extracts from bovine brain catalyze the transfer of methyl groups from S-adenosyl-L-methionine (AdoMet) to N-acetyl-S-farnesyl-L-cystein (AFC). It was determined by counting the radioactivity from[^(14)C] methyl AFC, the product of the methylation reaction as the α-carboxylmethyl ester derivative of AFC. According to subcellular cell fractionation, significant AFC is 11.1 μM, for AdoMet 3.8 μM and S-adenosyl-L-homocysteine (AdoHcy) was a competitive inhibitor with respect to AdoMet with an apparant Ki=1.8 μM. The change of methyl transferase activity following development of rat brain was analyzed and the highest specific activity was found 38 days after birth. respect to AdoMet with an apparant Ki=1:8 μM The change of methyl transferase activity following development of rat brain was analyzed and the highest specific activity was found 38 days after birth. Our results suggest that cystein carboxyl methyltransferase is distinct entity from protein methylase-Ⅱ (PM-Ⅱ) and associated with membrane in bovine brain conforming to previous reports.

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.

현장실험을 통한 VES-LMC 균열발생 원인분석

최판길,이봉학 강원대학교 산업기술연구소 2006 産業技術硏究 Vol.26 No.B

Many concrete bridge decks develop transverse cracking shortly after construction. These cracks accelerate corrosion of reinforcing steel and lead to concrete deterioration, damage to components beneath the deck, unsightly appearance. These cracks shorten the service life and increase maintenance costs of bridge structures. In this study, VES-LMC overlay, which provides the same benefits as a conventional overlay, is designed to cure very quickly. Although the materials for VES overlays are more expensive, the cost is more than offset by the savings on traffic control and work zone safety measures. Otherwise, reaction of hydration occurs very rapidly in beginning step(concrete placing). As a results, thermal cracking can be occur by thermal stress in accordance with hydration-heat The purpose of this study was to estimate diagnosis of crack occurrence of VES-LMC through field tests at early-age.

소프트웨어 모듈설계시 효율성 증가에 관한 연구

최길림 慶南專門大學 1997 論文集 Vol.25 No.1

웹 기반 사이버 코스웨어 저작 도구의 설계 및 구현

최길림,김현주,이재동 慶南專門大學 2001 論文集 Vol.29 No.1

멀티밴드 UWB 시스템의 무선성능 분석에 관한 연구

최석,김길겸,김학선 한밭대학교 정보통신전문대학원 2004 정보통신전문대학원 논문집 Vol.2 No.1

통신 시스템의 무선성능 요구조건 분석은 시스템의 성능을 예측하는 중요한 지표이다. 아직 표준안이 제정되지 않은 UWB(Ultra wide Band) 시스템은 명확한 시스템 성능 요구조건을 유포하기 어렵다. 또한, 기존 UWB 시스템과 멀티밴드 UWB 시스템의 무선성능 요구조건 분석에는 밴드 분할에 따른 무선 성능 요구조건의 도출상의 차이점이 있다. 이러한 차이점을 본 논문을 통해 분석하였으며, 이를 바탕으로 도출한 멀티밴드 UWB 시스템의 성능 요구조건을 본 논문에 기술하였다. 멀티밴드 UWB 시스템은 Sub-Band의 수에 따라 Throughput, 송 신 최대 전력, 수신감도 등이 변화하는 것을 관찰할 수 있었다. 또한, 멀티패스의 영향으로 PRE(Pu1se Repetition Frequency)를 감소시키면 Link Margin은 증가하여 멀티패스 에너지 손실(Multi-path Energy Loss)에 대한 보상으로 멀티패스 마진(Multi-path Link Margin)인 발생하는 것을 알 수 있었으며 멀티패스 마진에 따라 수신신호 감도 및 간섭신호에 대한 저항성이 변화하는 것을 모의실험을 통하여 분석하였다. The analysis of RF performance requirement conditions on communication system is critical indicator to predict the performance of system. UWB(Ultra Wide Band) system which the standard is not established yet is difficult to derive the precise system performance requirement condition. Also, there are differences between conventional UWB system and multi-band system about RF performance requirement condition. In this thesis, the differences are analyzed and performance requirement conditions of multi-band UWB system are described on the basis of the differences. Throughput, maximum transmit power, and sensitivity of multi-band UWB system is varied with respect to the number of Sub-Bands. In addition, because of Multi-path effect, if PRF(Pulse Repetition Frequency) is changed, the Multi-path link margin is happened to compensate for Multi-path Energy Loss which is contributed by increasing of the Link Margin. According to Multi-path Margin, the variation of the resistance with respect to sensitivity and interference signal is observed and analyzed through the simulation.

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.