도시유역에서의 유출해석을 위한 시험유역의 개발

서규우,송일준,구본석,김남길 동의대학교 산업기술개발연구소 2001 産業技術硏究誌 Vol.15 No.-

The purpose of this study is development of experiment catchment for hydrological monitoring at Urban Watershed. The location of test basin is Dong-Eui University, Gaya Dong, Pusan, Karea. For the collecting of basic hydrologic data of experiment catchment, topography inquiry and survey was conducted, and sub-basins data, such as areas of test basin and impervious layer, were arranged. On the basis of that result, a drainage pattern was drawn up and for the collection of hydrological data such as the rainfall data and the water-level data-EMS installed at Dong-Eui Univ. in 1998, and AWS-DEU(Automatic Water-level Station-Dong-Eui Univ) installed at the point of the end discharge.

흡입관에 부착된 이젝터내의 유동특성에 관한연구

이행남,박길문,모양우,이덕구,설재림,김건일 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2

The ejector is used to get low pressure, and it has been applied to a lot of industry field like the heat engine, the fluid instrument power plant, the food industry, environment industry etc. because there are not any problem even it is mixed with kinds of liquid, gas, and solid. The flow characteristics in diffuser are investigated by PIV and CFD. The agreement between numerical analysis and experiment shows the validity of this study and the results of this study would be useful to the engineers who design for the flow systems for heating, ventilation, air conditioning and wastewater purification plants.

곡관 덕트내 난류 비정상유동의 압력분포

박길문,이행남,백대우,손현철 朝鮮大學校 機械技術硏究所 2000 機械技術硏究 Vol.3 No.1

In this study, Flow characteristics of turbulent unsteady flows in a square-sectional 180°curved duct were experimentally investigated. Experimental studies for air flow were conducted to measure pressure distributions in the square-sectional 180°curved duct by using a magnehelic differential pressure gage. The experiment were conducted in nineteen sections from the inlet (ø=0°) to the outlet(ø=180°) of the duct at 10°intervals. The results obtained from the experimentation are summarized as follows. (1) In the turbulent oscillatory flow, the pressure distribution was the largest in the accelerating and decelerating region of the bend angle of 90°and the pressure difference of the inner and outer walls was the largest before and after the bend angle of 90°. (2) In the turbulent pulsating flow, the pressure difference was the largest near the region of bend angle of 90°in the case of the middle region, and since then the pressure difference of the inner and outer walls became smaller.

방사선 조사를 받은 흰쥐 망막 속얼기층의 미세구조

양석우,고정식,양남길,안의태,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

본 실험은 머리부분이 많은양의 방사선에 노출되었을 때 망막 속얼기층의 미세구조적 변화를 관찰하기 위하여 시행하였다. 실험동물로는 체중 200-250g의 흰쥐를 사용하였으며, 마취상태에서 머리부분에만 방사선을 조사하였다. 방사선 조사는 미쓰비시 선형가속기를 이용하여 조사거리 80cm, 구역 30cm X 30cm, 깊이 1.2cm 조건에서 1분당 200rad씩 연속조사하여, 3,000rad 또는 6,000rad를 조사한 후 6시간, 2일, 6일후에 희생시켰다. 각 동물은 1% glutaraldehyde- 1% paraformaldehyde액으로 관류고정하였다. 관류가 끝난 후 안구를 적출하여 톱니둘레를 따라 절단한 다음, 망막의 일정부위에서 조직을 떼어냈다. 떼어낸 조직은 2.5% glutaraldehyde- 1.5% paraformaldehyde액에 일차고정한 후 1%osmium tetroxide액에 이차고정하였다. 고정된 조직은 수세와 탈수과정을 거쳐 araldite혼합액에 포매한 다음 얇은 절편을 작성하여 uranly acetate와 lead citrate로 염색한 후 전자현미경으로 관찰하여 다음과 같은 결과를 얻었다. 1. 무축삭신경원의 세포질돌기는 전자밀도가 높은 어두운세포와 전자밀도가 낮은 밝은세포로 구분되었으며, 밝은 세포 가운데에는 과립형연접소포를 갖고 있는 돌기가 관찰되었다. 2. 3,000rad조사 후 6시간군의 경우 밝은 무축삭신경원이 세포질돌기와 신경절세포의 가지돌기는 팽대되었으며 사립체와 세포막이 파괴되는 모습이 관찰되었는데, 2일군의 경우 그 경향이 가장 심했다. 3. 3,000rad조사 후 6일군의 경우 부챗살아교세포의 영역이 넓어져서 전체적인 조직의 모습이 2일군의 것에 비하여 많이 회복되어 보였다. 4. 6,000rad조사 6일군의 경우 부챗살아교세포는 미세사가 많고 전자밀도가 높은 변성된 세포가 자주 관찰되었다. 이상의 결과를 종합해 보면 3,000rad의 방사선을 조사받으면 흰쥐망막의 속얼기층은 처음에는 무축삭신경원의 세포질돌기와 신경절세포의 가지돌기가 손상을 받았으나, 6일 후에는 부챗살아교세포의 영역이 넓어져서 많이 회복되었다. 그러나 6,000rad정도의 방사선을 조사하면 부챗살아교세포도 변성되어 속얼기층 전체가 변성된것으로 보아, 부챗살아교세포는 무축삭신경원이나 신경절세포에 비하여 방사선에 대한 저항성이 높다고 생각된다. This experiment was performed to study the morphological respones of the inner plexiform layer of the retina of rat following X-ray irradiation. Rats anethetized with sodium thiopental, were exposed only on their head areas with a single dose of 3,000rads or 6,000rads, respectively. Radiation was produced by Mitsubishi linear accelerator, at the speed of 200rads/min. The experimental groups were sacrificed on the 6th hour, 2nd hour, 2nd and 6th day after X-ray irradiation. Under anethesia, 1% glutaraldehyde- 1% paprformaldehyde solution was perfused through the heart. Pieces of the tissue taken from the posterior region of the retina were fixed in 2.5% glutaraldehyde- 1.5% paraformaldehyde, and in 1% osmium tetroxide, and embedded in araldite mixture. Ultrathin sections were stained with uranyl acetate and lead citrate solutions. From the ultrastructural study, following results were made: 1. Two types of amacrine cells, according to their elecrton densities, were found, i.e., light amacrine cell and dark amacrine cell. Granular synaptic vesicels were often observed in the light amacrine cells. 2. Two days after exposure to 3,000rads of X-ray, severe morphological changes were observed in cytoplasmic processes of light amacrine cells and dendrite of ganglion cells; i.e., edematous changes, framoentation of mitochondria, breakdown of cell membranes, etc. 3. Six days after exposure to 3,000rads of X-ray, many of the malformaitons were seen to be repaired, except the territory of activated Muller cell. 4. Six days after exposure to 6,000rads of X-ray, darkly degenerated Muller cell were frequently observed. From the above results, it was concluded that large amount of head-irradiation results the severe damages to the cytoplasmic processes of amacrince cell and the dendrites of ganglion cell in the inner plexiform layer of rat retina, but Muller cells are more radioresistant than amacrine and ganglion cells.

Time-evolving genetic networks reveal a NAC troika that negatively regulates leaf senescence in <i>Arabidopsis</i>

Kim, Hyo Jung,Park, Ji-Hwan,Kim, Jingil,Kim, Jung Ju,Hong, Sunghyun,Kim, Jeongsik,Kim, Jin Hee,Woo, Hye Ryun,Hyeon, Changbong,Lim, Pyung Ok,Nam, Hong Gil,Hwang, Daehee National Academy of Sciences 2018 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.115 No.21

<▼1><P><B>Significance</B></P><P>Leaf senescence is regulated in a complex manner, involving time-dependent interactions with developmental and environmental signals. Genetic screens have identified key regulators of senescence, particularly late-stage senescence regulators. Recently, time-course gene-expression and network analyses, mostly analyses of static networks, have predicted many senescence regulators. However, senescence is defined by time-evolving networks, involving the temporal transition of interactions among senescence regulators. Here, we present time-evolving networks of NAM/ATAF/CUC (NAC) transcription factors, central regulators of leaf senescence in <I>Arabidopsis</I>, via time-course gene-expression analysis of NACs in their mutants. These time-evolving networks revealed a unique regulatory module of NACs that controls the timely induction of senescence-promoting processes at a presenescent stage of leaf aging.</P></▼1><▼2><P>Senescence is controlled by time-evolving networks that describe the temporal transition of interactions among senescence regulators. Here, we present time-evolving networks for NAM/ATAF/CUC (NAC) transcription factors in <I>Arabidopsis</I> during leaf aging. The most evident characteristic of these time-dependent networks was a shift from positive to negative regulation among NACs at a presenescent stage. ANAC017, ANAC082, and ANAC090, referred to as a “NAC troika,” govern the positive-to-negative regulatory shift. Knockout of the NAC troika accelerated senescence and the induction of other <I>NAC</I>s, whereas overexpression of the NAC troika had the opposite effects. Transcriptome and molecular analyses revealed shared suppression of senescence-promoting processes by the NAC troika, including salicylic acid (SA) and reactive oxygen species (ROS) responses, but with predominant regulation of SA and ROS responses by ANAC090 and ANAC017, respectively. Our time-evolving networks provide a unique regulatory module of presenescent repressors that direct the timely induction of senescence-promoting processes at the presenescent stage of leaf aging.</P></▼2>

Frobenius numbers of Pythagorean triples

Gil, Byung Keon,Han, Ji-Woo,Kim, Tae Hyun,Koo, Ryun Han,Lee, Bon Woo,Lee, Jaehoon,Nam, Kyeong Sik,Park, Hyeon Woo,Park, Poo-Sung World Scientific 2015 International journal of number theory Vol.11 No.2

사용자 MBTI 성격유형과 정보시스템 지속사용의도간의 관계에 관한 실증적 연구

남길우(Gil-Woo Nam),김상훈(Sang-Hoon Kim),김창규(Chang-Kyu Kim) 한국컴퓨터정보학회 2011 韓國컴퓨터情報學會論文誌 Vol.16 No.1

본 연구는 정보시스템이 조직에 수용된 후의 이용단계에서 사용자의 성격유형이 지속적인IS 사용의도에 중요한 영향요인들 중 하나임을 추론하였고, 개인의 성격유형판별지표인 MBTI에 근거한 IS 사용자 성격유형에 따라 IS의 지속적인 사용의도의 수준이 어떻게 다른지를 실증적으로 규명하고자 하였다. 본 연구에서 도출된 연구모형과 가설을 검증하기 위해 330명의 IS 실무 사용자를 대상으로 설문조사를 실시하였고, 이에 의해 수집된 자료를 바탕으로 통계분석을 실시하였다. 실증분석 결과, 정보시스템 수용후 단계에 있어서 사용자의 지속적인 사용의도는 IS에 대한 자기효능감에 의해 영향을 받고, 자기효능감은 자기주도성에 의해 영향을 받으며, 자기주도성은 사용자 성격유형과 IS에 대한 기대일치수준에 의해 영향을 받는 것으로 나타났다. 즉, 사용자 성격유형과 3가지 매개변수들(기대일치, 자기주도성, 자기효능감)은 사용자의 지속적인 IS 이용의도의 중요한 에측변인들임이 밝혀졌다. 본 연구결과는 정보시스템 수용 후의 단계에서 IS 성공요인을 규명하는데 대한 이론적 근거를 제공할 뿐 아니라, 조직내 정보시스템의 구축 운영과 관련한 인사관리 업무수행에 있어서 실무적 가이드라인을 제공하는데 기여할 수 있을 것으로 본다. Focusing upon the post-adoption stage of IS, this study reasoned that IS users' personality is one of major influencing factors of continuous IS usage intention and empirically examined how the degree of continuous IS usage intention is variable according to the IS users' personality types classified based on MBTI(Myers Briggs Type Indicator). In order to validate the research model and hypotheses, this study made a field survey of 330 IS users and statistically analysed response data. The results of empirical analyses showed that the intent of continuous IS usage was affected by self-efficacy of IS; and self-efficacy by self-leadership of IS; and self-leadership by IS user' personality type and expectation confirmation. That is, it was found that IS users' personality type and three intervening variables(expectation confirmation, self-leadership and self-efficacy) were significant predictors of the intent of continuous IS usage. This study is thought to be contributive to providing the theoretical basis of finding IS success factors in the post-adoption stage and the practical guideline for effective personnel management relevant to IS implementation.

실내 포인트 클라우드 데이터 Downsampling의 Trade-off 분석을 통한 기초 연구

강남우 ( Kang Nam-woo ),오상민 ( Oh Sang-min ),류민우 ( Ryu Min-woo ),정용일 ( Jung Yong-gil ),조훈희 ( Cho Hun-hee ) 한국건축시공학회 2020 한국건축시공학회 학술발표대회 논문집 Vol.20 No.1

As the capacity of the 3d scanner developed, the reverse engineering using the 3d scanner is emphasized in the construction industry to obtain the 3d geometric representation of buildings. However, big size of the indoor point cloud data acquired by the 3d scanner restricts the efficient process in the reverse engineering. In order to solve this inefficiency, several pre-processing methods simplifying and denoising the raw point cloud data by the rough standard are developed, but these non-standard methods can cause the inaccurate recognition and removal the key-points. This paper analyzes the correlation between the accuracy of wall recognition and the density of the data, thus proposes the proper method for the raw point cloud data. The result of this study could improve the efficiency of the data processing phase in the reverse engineering for indoor point cloud data.

FADS gene regulation of Coffee metabolites in immune associated organs of mice with hypoxia-induced retinal degeneration

Gil Hyun Nam,Sang Mi Lee,Holim Jang,Sang Hoon Jung,Woo Jung Park 한국식품영양과학회 2014 한국식품영양과학회 학술대회발표집 Vol.2014 No.10

Plant leaf senescence and death – regulation by multiple layers of control and implications for aging in general

Woo, Hye Ryun,Kim, Hyo Jung,Nam, Hong Gil,Lim, Pyung Ok The Company of Biologists Limited 2013 Journal of cell science Vol.126 No.21

<P>How do organisms, organs, tissues and cells change their fate when they age towards senescence and death? Plant leaves provide a unique window to explore this question because they show reproducible life history and are readily accessible for experimental assays. Throughout their lifespan, leaves undergo a series of developmental, physiological and metabolic transitions that culminate in senescence and death. Leaf senescence is an ‘altruistic death’ that allows for the degradation of the nutrients that are produced during the growth phase of the leaf and their redistribution to developing seeds or other parts of the plant, and thus is a strategy that has evolved to maximize the fitness of the plant. During the past decade, there has been significant progress towards understanding the key molecular principles of leaf senescence using genetic and molecular studies, as well as ‘omics’ analyses. It is now apparent that leaf senescence is a highly complex genetic program that is tightly controlled by multiple layers of regulation, including at the level of chromatin and transcription, as well as by post-transcriptional, translational and post-translational regulation. This Commentary discusses the latest understandings and insights into the underlying molecular mechanisms, and presents the perspectives necessary to enable our system-level understanding of leaf senescence, together with their possible implications for aging in general.</P>