공단 폐슬러지에 있어서 응집제첨가에 따른 탈수특성에 관한 연구

엄태규,라원식,엄원탁,한기백 嶺南大學校 工業技術硏究所 1992 연구보고 Vol.20 No.1

To reduce the rate of water contained in the sludge of the industrial wastewater, this study was conducted by comparatively considering the dewatering effect according to addition of coagulant and dewaterability properties of sludge. The result of this study is summarized as follows. 1. The dewaterability properties of sludge presented that the suitable difference in pressure necessary a good dewaterability seems to be 200, 300㎜Hg. 2. When adding an ploymer coagulant to the sludge, its dewaterability properties showed that the higher the rate of addition, the better its dewaterability. Also, it appeared that the adequate rate of addition is about 0.3-0.7% when SS concentration of sludge is 18,000㎎/l, and that is about 0.3-0.4% when SS concentration of sludge is 35,000㎎/l, when this rate is more than 0.5%, it was shown that the dewaterability is insufficient due to both initial moment dewaterability and closing condition of the filter basin. 3. When adding 0.4% ploymer coagulant, the adding rate of inorganic coagulant indicated that the more the added inorganic coagulant, the lower the specific resistance. When the rate of addition is more than 9.0%, however, the filter water indicated a light yellow. For the reason, it is expected that the inorganic coagulant flows out ineffectively. It is expected that the adequate rate of inorganic coagulant addition is between 6.0-9.0%, therefore, while it is better to use both polymer and inorganic coagulant for dewatering the sludge.

윈도우 기반 PLC구동 프로그램 개발

김태형,정원지,엄태진,홍대선 國立 昌原大學校 産業技術硏究所 2000 産技硏論文集 Vol.14 No.-

As personal computers are being developed, most softwares are based on window-based operating systems recently. The programmable logic controllers (PLC's) which are usually operated based on the DOS system should be adapted to the window-based environment in order to have the multi-tasking and flexibility of PLC programs. In this paper, the PLC driving programs which are based on the window-based operating systems are developed for the hardwares in which only DOS-based driving programs are being used currently.

光量과 施肥水準에 따른 산초나무, 은행 나무, 보리수 및 쥐똥나무의 新梢生長과 葉綠素 合量

金甲泰,嚴泰元 상지대학교 1994 論文集 Vol.15 No.-

To determine the effects of light intensity and fertilization level on shoot growth and leaf, chlorophyll content, of Zanthoxylum schinifolium, Ginkgo biloba, Elaeagnus umbellata and sxLigustrum obtusifolium, shoot growth and monthly change of leaf chlorophyll contents were measured and compared. Leaf chlorophyll content of four species were increased with leaf growth, showed highest value on late August, and were decreased after that time. More leaf chlorophyll content and duration on late September were found in intensive fertilization plots. The less light intensity was illuminated, the more leaf chlorophyll content of Zanthoxylum schinifolium, Ginkgo biloba and Ligustrum obtusifolium were measured. The more light was illuminated, The more leaf chlorophyll content of Elaeagnus umbellata were measured on late May, June and July. The less light intensity and more fertilization were treated, the more shoot growth of Zanthoxylum schinifolium and Ligustrum obtusifolium were measured. The more fertilization were treated, the more shoot growth of Ginkgo biloba and Elaeagnus umbellata were measured. However, Shoot growth of Ginkgo biloba and Elaeagnus umbellata were not significantly differed between light intensity. Highly significant correlations between shoot growth and leaf chlorophyll content of Zanthoxylum schinifolium was proved throughly, and significant correlations of Ligustrum obtusifolium was proved partially. Correlations between shoot growth and leaf chlorophyll content of Ginkgo biloba and Elaeagnus umbellata was proved not significant.

Polyacryloyl Chloride 로부터 고분자 염료의 합성

이상원,엄달호,안태완 崇田大學校 1982 論文集 Vol.12 No.1

Several polymeric azo dyes were synthesized from reactive polymer, polyacryloyl chloride. The monomer, acryloyl chloride was synthesized, and then polymerized in N, N-dimethylformamide. Polyacryloyl chloride was reacted with 1, 4-phenylenediamine to poly-N-(4-aminophenyl) acrylamide, and the resulting polymer was investigated by infrared spectroscopy, nuclear magnetic resonance spectroscopy, and elemental analysis. The polymeric azo dyes were obtained by diazotization and coupling reaction of free amine group of the intermediate polymer. The polymeric dyes were insoluble in water and general organic solvents. The colors of these dyes were determined by visible spectrophotometry.

Identification of gibberellic acid sensitive dwarf (OsGASD)gene, encoding an ARP subunit that mediates gibberellic acid biosynthesis and effects to grain yield in rice

Tae Young Um,Won Tae Yang,Doh Hoon Kim 한국육종학회 2023 한국육종학회 공동학술발표집 Vol.2023 No.-

강원도 중왕산 지역의 지형 및 토양요인에 따른 고로쇠나무의 분포와 생장 특성

엄태원 ( Tae Won Um ),김갑태 ( Gab Tae Kim ) 한국환경생태학회 2006 한국환경생태학회지 Vol.20 No.2

한라산 어리목지역의 산림군집 구조에 관한 연구

엄태원 ( Tae Won Um ),김갑태 ( Gad Tae Kim ),추갑철 ( Gab Cheul Choo ),류동표 ( Dong Pyeo Lyu ) 한국환경생태학회 2007 한국환경생태학회지 Vol.21 No.2

제1분과 : 보호지역 관리 ; 낙엽송 인공조림의 벌채밀도에 따른 변화

엄태원 ( Tae Won Um ),홍종민 ( Jong Min Hong ) 한국환경생태학회 2015 한국환경생태학회 학술대회지 Vol.2015 No.1

1970년대 전국적인 조림정책으로 식재된 낙엽송인공조림지가 국립공원 내 위치하고 있어 이를 생태적으로 건전하고 종다양성이 풍부한 활엽수림으로 유도하고자 하였다. 이에 오대산국립공원내 월정사지역의 낙엽송림을 대상으로 2009년 밀도별(30%, 50%, 70%) 솎아베기(간벌) 후 2010년부터 2013년까지 활엽수의 천연갱신 양상을 조사하였다.각 벌채지별 3년간 치수발생량의 변화를 표 3에 보였다. 30%벌채구에서는 고추나무(131본) 등의 관목과 복자기나무(22본), 층층나무(25본), 물푸레나무(31본), 귀룽나무(66본) 등 교목성 치수들이 상당수 유입되고 있다. 그러나 유입된 목본류중 교목성 수종 대부분이 초본과의 경쟁에서 도태되어 고사하고 있으나 고추나무, 지렁쿠나무 등은 지속적으로 높은 생존율을 보였다. 교목성 수종 중 귀룽나무와 물푸레나무의 경우 치수발생량 및 생존율이 높아 일정 시간 경과후 하층 식생을 차지할 것으로 기대된다. 50% 벌채구는 30% 벌채지에 비해 치수의 발생량과 초본류의 발생량이 상당히 저조한 것으로 조사되었다. 상층부에 활엽수가 군상으로 존치되어 이들의 종자가 임상으로 유입되고 있지만 임상에 생육하는 조릿대의 영향으로 발생량이 감소된 것으로 판단된다. 이처럼 낙엽송림의 활엽수림으로의 유도뿐만 아니라 활엽수의 천연갱신 유도시 임상에 생육하는 조릿대의 제거는 필수적이라 판단된다. 발생된 치수 중 가장 큰 비율을 나타낸 것이 고추나무(151본)와 관목류인 국수나무(39본)이며 교목성 수종 중에는 귀룽나무가 22본, 층층나무 14본, 물푸레나무가 13본이 발생되었다. 특이할 만한 것은 침엽수인 젓나무 치수가 5본이 발생되어 생육하고 있다. 70% 벌채구는 벌채 후 거의 전광에 가까운 광의 유입으로 조릿대가 번성하여 교목성수종의 발아량이 매우 저조한 것으로 조사되었다. 귀룽나무, 층층나무 등 교목성 수종의 치수 발생량은 3년 동안 10개체 이하로 매우 저조하였다. 그러나 관목성수종인 국수나무의 경우 벌채 후 3년 경과 후인 2013년 308개체가 발생되었다. 또한 강한 광을 선호하여 산림벌채후발생된 공간이나 임도의 절.성토면에 주로 발생되는 두릅나무의 개체수가 2012년에 103개체, 2013년에 75개체로 나타났다. 두릅나무의 경우 초기 생장이 우수하여 하층의 대부분이 두릅나무로 잠식될 것으로 판단된다. 이처럼 강도의 벌채로 임상으로 유입되는 전광에 가까운 광으로 인해 조릿대의 번성과 두릅나무의 번성은 한동안 지속될 것으로 판단되며 이로 인해 원래 목적으로 하였던 활엽수 치수의 발생이 거의 이루어지지 못할 것으로 보여진다. 벌채구별 평균 고사율은 30% 벌채구에서 9.43%, 50%벌채구에서 12.72%, 70% 벌채구에서 8.33%로 나타났다. 각 벌채구별 고사율은 통계적 유의성이 인정되지 않아 별도의 표시는 하지 않았지만 약 10%내외의 고사율을보였다.

강원도 중왕산 지역의 지형 특성에 따른 주요 활엽수종의 분포(1)

엄태원 ( Tae Won Um ),이돈구 ( Don Koo Lee ) 한국산림과학회 2006 한국산림과학회지 Vol.95 No.1

낙엽송인공림의 간벌강도에 따른 수종 및 임분구조 변화에 관한 연구 -오대산국립공원 지역-

엄태원 ( Tae Won Um ) 한국환경생태학회 2015 한국환경생태학회지 Vol.29 No.4

The artificially grown forests of larch, planted in accordance with the nationwide afforestation policy in the 1970s, are located inside national parks. This study intended to induce a forestation system by which the forests develop into an ecologically healthy and broadleaved ecosystem with broad species diversity. For this, the aspects of natural regeneration of broadleaves from 2010 to 2013 after thinning by density (30%, 50%, and 70%) in 2009 were surveyed using the larch forest in the Woljeong Temple region inside Odaesan National Park. There were no trees that were larger than 2 ㎝in in diameter at breast height among the trees recently introduced between 2012 and 2013. A significant number of herbs have been introduced to the subsurface alongside young arboreal trees species such as Bumalda bladdernut, Acer triflorum, Cornus controversa etc and shrubs. However, many woody species did not survive the competition with herbs and repeated withering and regeneration. The number of woody species generated within the 30% cutting area was 440 species in 2013 and this figure has been increasing twofold each year. The number of woody plants within the 50% cutting area also showed an upward tendency and most plants did not survive in the competition with herbs and Sasa borealis and withered in only 1 ~ 2 years after generation. Unlike other thinning areas, the 70% cutting area showed 608 broadleaved trees, reflecting a decrease from 748 trees in 2012. This appeared to be attributed to the luxuriance of S. borealis and the sharp increase of fatsia following the inflow of total sunlight to the forest floor. Herbs were hardly generated due to the influence of S. borealis. Regarding the density for thinning at 50% or upper height, the forest treatment division shall maintain a proper density in the course of inducing artificial forestation of larch into natural broadleaved forests considering the luxuriance of sasa borealis and herbs due to the inflow of total sunlight to the forest floor.