청소년의 물질남용 행위 변화를 위한 개념 모형

안성윤,송예헌,이문숙,신홍현,정영희 김천과학대학 2006 김천과학대학 논문집 Vol.32 No.-

The purpose of this study is to develop a new concept model to apply social networks and social support theory to drug abuse behaviors in adolescents group. As the result, this study can be provide fundamental data to develop intervention study in community setting with relating issues.

축산 폐수의 효율적 처리를 위한 광합성 미세조류인 Spirulina platensis 배양 공정의 최적화

안주희,김성수,김태호,이준엽,오상집,이진하,이현용 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.4

돈분 폐수의 효율적인 처리를 위해 6 W/㎡, 12 W/㎡와 24 W/㎡의 조도 하에서 온도를 15℃에서 40℃까지 각각 변화시켜, 광합성 미세 조류인 Spirulina platensis의 생육에 관한 최적 생육 조건 결정에 관한 실험을 하였다. 균체의 비생육속도는 30℃까지는 온도 증가에 따라 증가하였다. 균체의 생육에 있어서 온도의 영향을 설명하기 위해서 Arrhenius 식을 이용하여서 얻은 활성화 에너지 값은 13.5kal/mol이었다. 순수 배지에서 배양된 균체의 비생육속도가 0.31(1/day)인 반면 30% 돈분 첨가 배양시 얻은 균체의 비생육속도는 0.24(1/day)였다. 폐수내의 총 질소량과 이의 제거속도로 균체의 폐수 처리 능력을 평가할 수 있었다. 돈분 농도를 달리 첨가한 회분배양에 있어서 70~93%(PO_4^3- -P), 67~93%(inorganic nitrogen), 80~90% (COD) 그리고 37~56%(organic nitrogen)의 감소율을 보였다. 총-질소와 총-인의 1차반응 감소 속도 상수는 각각 0.17(1/day)와 0.14(1/day)로 계산되었다. 20% 돈분을 첨가하는 연속배양에 있어서 회석률이 0.20(1/day)일 때 최대 균체농도가 1.52(g/L)를 유지했다. 돈분처리 후 얻은 균체의 성분은 단백질이 58.7%, 지방 11.0% 그리고 회분이 15.6%였다. The kinetics of growing microalga, Spirulina platensis was investigated to treat swine wastes with optimum growth conditions. Temperature was varied from 15 to 40℃ at three different light intensities, 6 W/㎡, 12 W/㎡ and 24 W/㎡. The specific growth rate was increased as temperature increased up to 30℃. The activation energy was estimated as 13.5 kcal/mol by an Arrhenius relationship. 0.24(1/day) of specific growth rate was obtained from batch cultivation with 30% swine wastes, compared to 0.31 (1/day) from clean culture. It was found that Spirulina platensis was able to reduce 70~93% of PO_4^3- -P, 67~93% of inorganic nitrogen, 80~90% of COD and 37~56% organic nitrogen by adding various concentrations of swine wastes for 12 days of batch cultivation. Rate constants for removing nitrates and phosphates in treating swine wastes were estimated as 0.17 (1/day) and 0.14 (1/day) in the first order reaction, respectively. 1.52(g/L) of maximum cell density was maintained at 0.20(1/day) of dilution rate in continuous culture, adding 20% swine wastes for 30 days. The chemical composition of the biomass obtained from the process showed 58.7% of protein, 11.0% of lipid and 15.6% of ash.

上向流式 好氣性 生物膜에 의한 農藥含有廢水의 處理에 관한 硏究

안용희,장성호,안종수,박출재,김수생 동아대학교 공과대학 부설 한국자원개발연구소 1994 硏究報告 Vol.18 No.2

This study has been carried out to determine the toxicity of agricultural chemical (TPN) as to wastewater treatment. This system used Aerated Submerged Up-Flow Biofilm Reactor. This reactor can withstand the variation of concentration, flow rate and presence of certain toxic materials in the wastewater to be treated. An acclimation experiment was variated influent COD from 250㎎/ℓ~70㎎/ℓ. The agricultural chemical was added to obtained optimum condition at influent COD 400㎎/ℓ by the acclimation experiment. The conclusions from the experimental results are as follows ; 1. Influent COD concentration was variated 250㎎/ℓ~600㎎/ℓ. The treatment efficiency was stability(86% to 93.3%). When influent COD was 400㎎/ℓ, the treatment efficiency was at best-93.2%. Accordingly, this system was proved to be suitable in treating the wastewater with wide range of concentration. 2. The influent TPN concentration below 1ppm at Up-Flow Aerated Biofillm Reactor, raised no harmful result to treatment efficiency. 3. The treatment efficiency was decreased to 29.8% when the lapse of time. 4. When the experimental TPN toxicity was compared with the DDT toxicity in the reference, it was proved that both of the toxicity had the similer trend.

중간스프링을 가진 개선된 탄성지반상(彈性地盤上) 보의 휨해석

鄭熺孝,李承烈,安光列 慶尙大學校 經營行政大學院 2004 工學硏究院論文集 Vol.20 No.-

While the BEF(Beam on Elastic Foundation, Wright et al, 1968) analogy has been widely used in straight and simple supported box girder analysis, the EBEF(Equivalent Beam on Elastic Foundation, Yao. T. Hsu et al, 1995) analogy has been made possible in curved and continuous box girder. Instead of using the traditional trigonometric foundation to solve a BEF problem, EBEF analogy used stiffness matrix considering bending, shear, elastic foundation and defined middle diaphragms in box girder as middle supports of continuous beam. In this study, for the comparison with BEF analogy, the element length of beam is determined first and infinity support stiffness corresponding to dimensionless middle diaphragm stiffness is determined in EBEF analogy. Two approaches, BEF and EBEF analogy are compared in the beam on elastic foundation.

전국 단위 감시체계의 현황과 전망

강성규,안연순,지영구,김형옥,하미나,권호장,백남종,김성아,홍윤철,김재용,강대희,정혜선,하은희 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.2

폐결핵 환자 혈청에서 수용성 Interleukin 2 수용체 및 Adenosine Deaminase 활성도에 관한 연구

고정희,박성규,백상현,박찬권,박병수,안진영,최우석,박정규 충남대학교 의과대학 지역사회의학연구소 1993 충남의대잡지 Vol.20 No.1

Interleukin-2 (IL-2) induces T cell proliferation in an autocrine manner and provides a means by which antigen triggered T cells can be clonally expanded in vitro. During the following activation, the activity of IL-2 is mediated by specific high affinity IL-2 binding membrane receptors which are expressed shortly after activation. In this process, a 42 KD-fragment (soluble IL-2R) is continuously cleaved off and circulates as a soluble marker of T lymphocyte activation. Elevated level of soluble IL-2R has been identified in the serum of patients with malignant autoimmune and allergic disorders, systemic parasitic infection, undergoing graft versus host disease, acute or chronic lymphocytic leukemia and HIV-infection. ADA (adenosine deaminase) completes the process of differentiation of T cell and is essential for progression of T cell maturation. Therefore level of ADA is to correlated with magnitude of T cell immune response. The fact that expression of sIL-2R and ADA activity increases in peripheral blood T-lymphocytes of patients with active pulmonary tuberculosis suggests that T cell activation might have a major role in the pathogenesis of pulmonary tuberculosis. In order to evaluate the T cell immune response in pulmonary tuberculosis, we measured the serum concentration of sIL-2R and ADA activity in 17 patients with current pulmonary tuberculosis, 10 chronic inactive pulmonary tuberculosis, 10 as normal controls. (1) Current pulmonary tuberculosis had significantly higher levels of sIL-2R (237.24±95.47)when compared with those of inactive tuberculosis (78.6±11.06). and the control (68.17±15.4) group. (2) ADA activity in current pulmonary tuberculosis was significantly increased (34.41±20.63) when compared with those of inactive tuberculosis (24.7±14.36) and control (17.65± 5.94) group. (3) There was good correlation between sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group. (4) sIL-2R concentration and ADA activity was decreased significantly 6 months after anti-tuberculosis drug medication. In conclusion, sIL-2R concentration and ADA activity in serum in current pulmonary tuberculosis group was increased when compared with those of inactive pulmonary tuberculosis and the control group. By the way, T cell mediated immune response was enhanced in current pulmonary tuberculosis, but in inactive chronic pulmonary tuberculosis who had treated by antituberculosis drug medication, the concentration of sIL-2R and ADA activity was nearly normal.

隔壁의 傾斜에 따른 箱子桁의 硏究

鄭熺孝,安光列,李承烈,朴泳珏 경상대학교 생산기술연구소 2002 工學硏究院論文集 Vol.2 No.-

The box girder has became a popular bridge type for long span or curved bridges because of its structural advantage of torsional stiffness. Generally box girder have inner diaphragms. The purpose of diaphragms is to prevent the deformation of cross section shape. Most diaphragms are parallel to cross section but it is necessary at present to adapt the design of bridge structures to transport requirement and the restrictive conditions of environment. City bridges, bridges spanning railway lines and stations, skew crossing of streets and highways, etc., require an irregular arrangement of internal supports. If diaphragms are applied, they are usually skew. It is advantageous to use a box girder as the basic component for a bridge of this kind because the box girder provides a high torsional stiffness, a favorable stresses, and due to the small shear stresses arising due to torsion. This paper deal with the analysis of the function of irregularly situated support and skew diaphragms and with their influence on the resulting state of stress of the box girder and compare with vertical deflections, horizontal deflections, longitudinal stresses, distortional stresses according to the angle of diaphragms.

경사격벽을 가진 상자형의 해석

鄭熺孝,安光列,李承烈,朴泳珏 경상대학교 생산기술연구소 2001 工學硏究院論文集 Vol.1 No.-

It is necessary at present to adapt the design of bridge structures to transport requirement and the restrictive conditions of environment. City bridges, bridges spanning railway lines and stations, skew crossing of streets and highways, etc., require an irregular arrangement of internal supports. If diaphragms are applied, they are usually skew. It is advantageous to use a box girder as the basic component for a bridge of this kind because the box girder provides a high torsional stiffness, a favorable stresses, and due to the small shear stresses arising due to torsion. This paper deal with the analysis of the function of irregularly situated support and skew diaphragms and with their influence on the resulting state of stress of the box girder. The solution is shown for a box girder under eccentric load and according to the length of skew diaphragms.

국내에서 분리된 Extended-Spectrum β-Lactamase 생성 Escherichia coli와 Klebsiella pneumoniae의 빈도 및 유형

홍성근,김선주,정성훈,장철훈,조성란,안지영,신종희,이혜수,송원근,어영,염종화,용동은,이경원,정윤섭 대한임상미샐물학회 2003 Annals of clinical microbiology Vol.6 No.2

DSP를 이용한 유도 전동기 구동장치의 경제적 구현 기법

한성룡,안희옥 國立金烏工科大學校 産業技術開發硏究院 2002 産業技術開發硏究 Vol.18 No.-

Recently, AC induction motors are replacing the conventional DC motors in industrial drive applications. This is due to the fact that AC drive system is more reliable and more economical than DC drives. And the vector control theory gives high performance control characteristics to AC drive systems. However, the application of vector-controlled AC drive technique to the industries is not easy since the background theory is hard to understand and the implementation methods are complicated. In this paper, an implementation method for the vector-controlled AC drive system is proposed. This includes the analysis of most recent techniques in power circuit of three-phase inverter, control algorithm, digital signal processor(DSP), and DSP software. The target of the implementation is high reliability and low price for industrial applications. The proposed technique is confirmed through an implementation and experiment of 1 kW AC induction motor drive system.