정수처리 공정에서 철과 망간 잔류 농도에 관한 연구

최미리,서규태,문병현,이택순 7개 국립대학교 환경연구 논문집 공동발행 위원회 2003 공업기술연구 Vol.3 No.-

This study was to investigate the cause of the color and turbidity in a small-scale water treatment plant using lakes water as water supply source. Water qualities in aqueducts, in depth of the lakes and in each process were measured. And effects of prechlorination on each unit operation in the water treatment, especially on iron and manganese removal, were studied. The concentration of iron and manganese was 0.13, 0.08 mg/L in the surface water and 1.93 and 0.433 mg/L in 15 m depth of the lake. Higher iron concentration of the inlet was measured to 5.35 mg/L which was caused by the steel aqueduct corrosion. The optimun coagulation dosages of Poly Aluminum Chloride(PAC) and Liquid Aluminum Sulfate (LAS) were 17.5 mg/L and 35 mg/L. Pretreatmnet of raw water with CaCOl improved the removal efficiencies of iron and manganes. However, more efficient method for removing iron and manganes was required.

노드 채색문제에 대한 기존 해법의 분석 및 분류

최택진,명영수,차동완 한국경영과학회 1993 한국경영과학회지 Vol.18 No.3

The node coloring problem is a problem to color the nodes of a graph using the minimum number of colors possible so that any two adjacent nodes are colored differently. This problem, along with the edge coloring problem, has a variety of practical applications particularly in item loading, resource allocation, exam timetabling, and channel assignment. The node coloring problem is an NP-hard problem, and thus many researchers develop a number of heuristic algorithms. In this paper, we survey and classify those heuristics with the emphasis on how an algorithm orders the nodes and colors the nodes using a determined ordering.

韓ㆍ日語の經濟に關することわざの硏究(2)

최택호 영산대학교 2000 영산논총 Vol.6 No.-

한국어와 일본어의 경제에 관한 속담을 여러 가지 자료집에서 선별하여 그들의 의미와 표현의 차이를 비교 고찰하며, 그리고 앙케이트 조사를 실시한다. 특히, 양국의 경제에 관한 속담을 의미내용상의 비교분석을 해서 분류한, 근면, 절약, 실리, 손, 사치와 낭비, 부와 부자, 가난과 가난한 사람, 인색함과 욕심, 빚과 돈의 거래, 억제에 대한 속담들 중에서 본고에서는 부와 부자, 가난과 가난한 사람, 인색함과 욕심, 빛과 돈의 거래, 억제에 대한 속담의 의미분류와 표현, 한국어의 경제에 관한 속담의 앙케이트 조사를 다룬다.

학과평가 및 교원업적평가 운영방안

최병태,서승교,박영순,이택영 대구산업정보대학 2000 논문집 Vol.14 No.2

Starter 및 멸치액젓 첨가가 김치양념 및 겉절이 김치의 품질에 미치는 영향

최택권,박소희,유진현,임호수,조재선,황성연 한국식생활문화학회 2003 韓國食生活文化學會誌 Vol.18 No.2

양념에 Leu. mesenteroides, Lac plantarum의 젖산균과 멸치액젓 첨가가 김치 양념의 대장균군 제어, 속성촉진여부 및 관능적 특성에 미치는 영향을 조사하였다. Leu. mesenteroides과 젓갈을 첨가한 경우 초기 숙성이 촉진되나 후기 산패는 완만하였으며 Lac. plantarum의 첨가시에는 초기 숙성에는 큰 차이가 없고 후기 산패가 현저하게 진행되었다. 대장균군은 산도 0.80% 이상에서 사멸되었는데 leu. mesenteroides의 경우가 숙성이 촉진되어 보다 신속히 사멸시켰다. 총균수와 젖산균수는 초기에 starter 첨가구는 10^6CFU/mL 정도인데 반해서 starter를 첨가하지 않은 않은 처리구에서 총균수는 10^6CFU/mL , 젖산균수가 10^4CFU/mL 이었고 숙성 후에는 첨가균이 높은 수준을 유지하였다. 하지만 대체적으로 스타터의 첨가가 숙성 및 대장균에 크게 영향을 주지 못하는 경향으로 동일하게 나왔다. 관능적 특성에서는 Leu. mesenteroides 첨가구가 Lac. plantarum의 경우보다 우수하였다. 한편, 시판 겉절이 김치는 산도가 0.09~0.18%, ph 5.46~5.89, 총균수 2.2×10^6~3.1×10^7CFU/mL, 젖산균수는 2.1×10^4~6.6×10^5CFU/mL, 대장균수는 1.8×10^4~7.1×10^5CFU/mL, 염분 1.89%~2.51%으로 스타터 첨가 겉절이에 비해 ph와 염도를 제외한 품질 특성에서 전반적으로 낮은 값을 나타냈다. This study was performed in order to investigate the effect of Leuconostoc mesenteroides, Lactobacillus plantarum and salt fermented anchovy extracts on Kimchi sauce. The sauce was fermented more rapidly by addition of Leu. mesenteroids or salt fermented anchovy extracts on the early fermentation stage than the control, but it was fermented slowly on the late fermentation stage. When L. plantarum was added to the Kimchi on the early fermentation stage, the acidity of Kimchi didn't show a significant difference from the control, but acidity was remarkably increased on the late stage. Coliform group was disappeared when acidity of sauce was higher than 0.8% during fermentation. It was controlled by Leu. mesenteroides but not by L. plantarum. Total count and lactic acid bacterial count of the sauces with starter were 6.30×10^6~1.0×10^7 CFU/mL and 1.04~2.04×10^6 CFU/mL, respectively, but those of the control sauce were 10^6 CFU/mL and 10^4 CFU/mL, respectively. Those count of the sauce with starter were higher than those of the control sauce on the later stage of fermentation. Organoleptic quality of the sauce with Leu. mesenteroides was superior to that with L. plantarum.

선반 기어박스의 기어열 - 축계 진동 해석 및 저감에 관한 연구

최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-

In this study, torsional and lateral vibrations of a gear box transmission system were analyzed theoretically using some mathematical models and examined to determine the causes of its excessive vibrations. As the results, it was found there exist possibility of resonance between gear mesh frequencies and lateral vibration mode of the transmission shaft during the third shifting mode operation. In order to avoid this resonance, we proposed changing the arrangement of gears on the transmission shaft. The measured vibration levels of the improved gear box were dramatically reduced. These results may be helpful to design a machine tool gear box with low noise and vibration.

평면운동모델을 이용한 LMG 상에서 이송되는 Cross Head의 사행동 해석

최영휴,김성훈,정택수 國立 昌原大學校 産業技術硏究所 2002 産技硏論文集 Vol.16 No.-

In this paper, a simple 2 D.O.F. planar motion model is proposed in order to analyze the snake motion of a cross head assembly travelling on linear huide rails. In the proposed mathematical model, the head assembly and a ball screw are assumed to be rigid, but the rear-panel of the machining center is assumed to be flexible. The equations of motion of the proposed model are derived and solved by Runge-Kutta method to determine vibration responses of the head assembly due to some applied traction forces.

NC선반 기어박스의 기어열 : 축계 진동해석 Spindle System for an NC Lathe Gear Box

최영휴,박선균,배병태,정택수,김청수 한국공작기계학회 2000 한국공작기계학회 추계학술대회논문집 Vol.2000 No.-

In this study, two mathematical models are first constructed to analyze vibration characteristics of a gear train - spindle system of an NC lathe gear box. One is a lumped parameter model which is used for calculating natural frequencies of the torsional vibration, the other is a finite element model for analyzing lateral vibration and critical speeds of the spindle system. In addition, this study examines some possible resonance conditions such as gear mesh frequencies, IX shaft rpm frequencies over whole operating speed range, and so on. The results may be helpful to design a machine tool gear box with low noise and vibration.

맥주오염미생물의 동정과 specific PCR primer의한 신속한 검출 방법

이택인,최신건 江原大學校 産業技術硏究所 2008 産業技術硏究 Vol.28 No.A

Several contaminated bacteria such as Lactobacillus brevis and Pediococcus damnosus in beer production cause beer spoilage by producing off flavours and turbidity. Detection of these organisms is complicated by the strict anaerobic conditions and lengthy incubation times required for their cultivation, consequently there is a need for more rapid detection methods. Recently, two contaminated strains were isolated from vessel of beer production and identified as Lactobacillus species by API kit identificaton as well as 16S-23S ITS sequencing analyses. Two isolated strains were named as Lactobacillus sp. HLAl and Lactobacillus HLB2, respectively. A polymerase chain reaction (PCR) method was developed for the rapid and specific detection of Lactobacillus sp.. Two sets of primer pairs (HLA1-F/HLA1-R and HLB2-F/HLB2-R) were designed for the amplification of a 1576 base pair (bp) fragment of the HLA1 16S-23S rRNA gene and 1888 bp fragement of the HLB2 16S-23S rRNA. Amplified PCR products were highly specific to detect corresponding bacteria when other contaminated strains were used as PCR templates. However, detection of both strains were limited when 100 ㎕ of cultured samples were mixed with 100 ㎕ of beer sample in arbitrary manner. The sensitivity of the assay still needs to be improved for direct detection of the small amounts of bacteria present in beer.

보이드 생성기구에 의한 복합조직강의 연성 파괴거동에 관한 연구

吳澤烈,崔明振,楡龍錫,金松正 慶熙大學校 材料科學技術硏究所 1993 材料科學技術硏究論集 Vol.6 No.-

Ductile Fracture of Dual Pase Steel begins with void nucleation, at Martensite-Ferrite interface or deformed Martensite particle. In this study void nucleation, void growth, void volume fraction and void coalescence at given strain were studied in dual phase steel. Therefore, by means of the heat treatment of low corbon steel the study deal with void nucleation and void growth for ferrite grain sizeof dual phase steel. Void nucleaton and void growth with increasing strain are shown depend upon the ferrit grain size. The number of voids and volume fraction of voids generary increase as ferrite grain size decrease. At the close to fracture the void coalescence in the direction of the applied tensile stress, but near the fracture surface they linked in direction transverse to the tensile axis.