고온에서 HAN 계열 추진제 액적의 거동에 대한 연구

황창환(Chang Hwan Hwang),백승욱(Seung Wook Baek),한조영(Cho Young Han),김수겸(Su Kyum Kim),전형열(Hyung Yeol Jeon) 한국연소학회 2012 KOSCOSYMPOSIUM논문집 Vol.- No.45

The droplet behavior of 83.9 wt.% HAN water solution was investigated experimentally with various ambient temperature and nitrogen environment. At the initial stage of evaporation under thermal decomposition temperature of HAN, gradual decreasing of droplet diameter was observed. After that, the droplet started to expand due to the internal pressure build up by water nucleation inside the droplet. The micro explosion was observed at higher temperature than the decomposition temperature of HAN and the remaining droplet showed similar behavior of single composition droplet. The decreasing rate was augmented as the ambient temperature increasing.

한강하구지역에서 월동하는 재두루미(Grus vipio)의 개체군 감소

이화수(Hwa-Su Lee),신주열(Ju-Yeol Shin),이시완(Si-Wan Lee),강태한(Tae-Han Kang),윤순영(Soon-Young Yoon),김정수(Jungsoo Kim) 한국조류학회II 2012 한국조류학회지 Vol.19 No.4

김포시와 고양시 일대의 한강하구 지역은 우리나라에서 재두루미의 가장 중요한 월동지 및 중간기착지로 알려져 있지만, 이 지역의 조류 서식환경은 심각한 개발압력과 인간의 간섭으로 인해 지속적으로 나빠지고 있다. 따라서 본 연구에서는 2007-2008년과 2011-2012년의 월동시기에 본 지역에 도래하는 재두루미를 대상으로 월동 개체군 크기 변화와 월동지역 내에서 과거와 현재의 취식지역 이용 현황 등을 조사하여 개발행위가 이들의 서식에 미치는 영향을 확인하였다. 본 지역에서 월동하는 재두루미 개체군은 평균 124.9개체(2007-2008년)에서 59.0개체(2011-2012년)로 감소하였으며, 주요 취식지역에서 확인된 개체수는 평균 77.7개체에서 24.1개체로 감소하여 월동개체군의 감소폭에 비해 주요 취식지역의 이용 개체수의 감소폭이 더 크게 나타났다. 유형별 분석에서는 가족군에 비해 무리군의 개체수가 많이 감소한 것으로 나타났으나, 홍도평 지역의 가족군 이용 개체수는 변화가 나타나지 않았다(Mann-Whitney test. Z=-0.26, p=0.979). 그리고 과거 다수의 재두루미가 주요 취식지역으로 이용하였던 송포동과 평동지역은 2012-2013년 조사에서는 거의 이용하지 않는 것으로 나타났다. 이는 위 지역의 개발행위(예: 제 2자유로 건설 등)와 깊은 연관성이 있는 것으로 생각된다. Han-river estuary in Gimpo and Goyang city is well known as one of the most important wintering and stopover sites for migrating White-naped Crane (Grus vipio) in Korea. Nowadays, habitat quality of this area is getting worse due to serious development pressure and high human disturbances. So, we wanted to know whether development actions affected total wintering population change in Han-river estuary and feeding group pattern of White-naped Crane in main feeding habitats between the 2007-2008 and 2011-2012 wintering period. Average wintering population was decreased 124.9 to 59.0 and population of main feeding site also decreased 77.7 to 24.1. But decrease rate of main feeding site population was higher than total wintering population. Non-family feeding population was more decrease than family feeding population in the flock type analysis. But family feeding population of Hongdopyong was maintained from past and present (Mann-Whitney test. Z=-0.26, p=0.979). However, almost all White-naped Crane din not use both feeding sites, Pyong-dong and Songpo-dong, where were deteriorated habitat quality by human act.

평판 위에 세워진 두 개의 원통 전방에서 나타나는 2차원 표면전단응력분포 측정에 관한 연구

이한상,이열 한국항공대학교 2000 論文集 Vol.38 No.-

본 연구에서는 평판 위에 수직으로 놓여진 두 개의 원통 전방에서 나타나는 2차원 표면전단응력 분포가 측정하는 새로운 기법이 시도되었다. FISF 측정법이라 일컫는 이 측정법은 모델표면 위에 위치한 오일막의 두께가 유동에 의하여 시간에 따라 얇아지는 정도를 광학장치를 통하여 측정하고, 이를 이용하여 표면전단응력 분포를 얻어내는 방법이다. 촬영된 간섭영상에서 오일막의 두께를 구하기 위하여 선형연결법이 응용되었고, 유선의 방향을 결정하기 위하여 잉크점유막법이 사용되었다. 얻어진 두 결과를 오일막 방정식에 대입하여, 최종적인 원통 전방에서의 2차원 표면전단응력 분포가 측정되었다. 측정 결과 원통 전반부에서 표면전단응력은 유동내 attachment line을 따라 점점 감소하며 saddle point 부근에서 0에 근접하고, 원통의 중심축을 지나면서 응력이 증가함을 알 수 있었다. An experimental study to measure two dimensional skin friction distribution ahead of two circular cylinders mounted on a flat plate is described. The instrument termed, the Fringe Image Skin Friction (FISF) meter, is designed to measure skin friction over a certain region of a thin oil-film placed on the test model surface subject to aerodynamic shear. During tests, a CCD camera captures images of fringe pattern produced over the oil film surface, and the linear connection method is applied to determine the oil-film height distribution from the fringe patterns, and the streamline patterns are also determined by means of ink-dot-liquid-film technique. The distribution of oil-film height and streamline patterns can be combined and applied to the thin-oil-equation, and finally the skin friction distribution for a certain area ahead of the two circular cylinders can be obtained. The experimentally obtained result shows that the skin friction decreases along the attachment line and increases to spanwise direction to the symmetric line of the two cylinders.

雨水管路 滿水時 水理學的擧動에 대한 XP-SWMM와 水理模型實驗의 比較 硏究

최한규,백효선,백두열 강원대학교 산업기술연구소 2005 産業技術硏究 Vol.25 No.B

To use land more efficiently under urbanization trend, Kangwon Province often covers open channels of creeks and uses them as parking lots or roads. A covered open channel section tends to form a rectangular culvert. Therefore, a creek with covered open channels can function as a storm drain. At the time of light rainfall, there are no significant differences except water flowing pattern between a creek with a covered open channel and a creek without it. Recently, however, the frequent occurrence of heavy rainfalls limited at a small, definite area has become problematic. When the heavy rainfall causes the carrying capacity of a creek to be exceeded, the creek with covered open channel has a more serious problem than the creek without it has. Therefore, we made an interpretation of data and conducted hydraulic model experiment to come up with economical solution to this problem.

영상 융합을 이용한 다중 스펙트럼 영상 분석

金漢烈,金仁澤 明知大學校 産業技術硏究所 2003 産業技術硏究所論文集 Vol.22 No.-

Abstract - This paper presents a method for detecting skin tumors on chicken carcasses using multi-spectrum image. It utilizes both fluorescence and reflectance image information in multi-spectrum images. A detection system that is built on this concept can increase detection rate and reduce processing time, because the procedure for detection can be simplified. Chicken carcasses are examined first using band radio FCM information of fluorescence image and it results in candidate regions for skin tumor. Next classifier selects the real tumor spots using PCA components information of reflectance image from the candidate regions. For the real world application, real-time processing is a key issue in implementation and the proposed method can accommodate the requirement by using a limited number of features to maintain the low computational complexity. Nevertheless, it shows favorable results and, in addition, uncovers meaningful spectral bands for detecting tumors using multi-spectrum image. The method and findings can be employed in implementing customized chicken tumor detection systems.

전략적 계획이 성과에 미치는 영향

방호열,이한철 釜山 大學校 經營 經濟 硏究所 1999 經營 經濟 硏究 Vol.18 No.1

전략적 계획이 기업의 성과에 미치는 영향에 관해서는 그 동안 많은 연구가 이루어졌다. 이들 연구의 결과는 전략적 계획을 수립하는 기업(planning firms)은 그렇지 않은 기업(non-planning firms)에 비해 성과가 높다는 것이다. 이 논문은 이런한 기존 연구의 결과를 바탕으로 전략적 수출계획과 성과간의 관계를 한국의 중소기업을 대상으로 실증적으로 검증하는데 그 목적이 있다. 이에 따라 한국의 중소제조기업을 중심으로 이들 기업의 전략적 수출계획의 수준은 어떠한가. 그리고 전략적 수출계획이 기업의 성과에 어떤 영향을 주는지를 분석하였다. 분석결과를 요약하면, 현지국시장 요인중에서 외국비용의 존재가 가장 전략적 수출계획의 수립에 가장 큰 영향을 주는 것으로 나타났으며, 다른 변수는 한국중소기업들의 전략적 수출계획의 수립과 무관한 것으로 나타났다. 성과와의 관련성에 있어서는 통계적인 유의수준은 낮았지만, 전략적 수출계획의 고도화는 기업의 성과를 높이는 것으로 나타났다.ZQ

傾斜度및 傾斜長이 土壤侵蝕에 미치는 影響에 關한 硏究

朴成宇,劉漢烈 서울大學校 農科大學 1977 서울대농학연구지 Vol.2 No.1

When it comes to reclaiming slopy upland, there should be prepared any facilities and agronomical management systems appropriate enough to protect soil erosion phenomena that are accelarated by the reclamation. The controlling factors for soil erosion are considered as agronnomical management and engineering construction. All the phenomena of soil erosion chiefly consisting of soil detachment, transportation, and sedimentation by raindrop and surface runoff, etc. are varied with so indescribably compricating parameters that they are supposedly natural and consequently uncontrolled events for a long time. Through worldwise enormous experiments for nearly a century, they are under mathematical description. The results are so-called Universal Soil Loss Equation. We have not evaluated the feasibility of the Equation. With our facing impending problems concened with the related undergoing project throughout the Republic, however, the Equation is greatly wanted to be modfied for suitable application through evaluation of each parameter. This study is primarily conducted for the purpose: especially concerned with modification of slop-length factor(??) in the Equation. There being difference between the tested plots and the standard plot described in the Equation, the results would not be fit enough to estimate the direct effects of slope-length parameter on soil loss. Some descriptive results are delivered here between variation of slope-length and corresponding soil loss. The observed soil erosion quantity is about three times more than the calculated value using the established Taneta's ??-values. Such the results imply Taneta's ??-valuefuction may have some restriction applying for the ?? value of the Equation in the Republic.

당뇨병 치료를 위한 SGLT2 억제제의 심혈관계 안전성 관련 최근 임상시험 결과고찰

김혜럼, 한나영, 유미선, 권광일, 윤휘열 충남대학교 약학대학 의약품개발연구소 2017 藥學論文集 Vol.32 No.-

Patients with type 2 diabetes have a two-to three-times greater risk of developing car-diovascular disease than people without diabetes, and the mortality rate from cardiovascular disease is also reported to increase. The reason why cardiovascular disease is more common in type 2 diabetic patients is not only that cardiovascular risk factors are more common than non-diabetic patients, but also that diabetes itself is an independent risk factor for cardiovascular disease. Since rosiglitazone. which was introduced as a treatment for type 2 diabetes in 2000, has been argued to increase cardiovascular disease sluch as myocardial infarction. there were clinical trials of cardiovascular safety of it such as DREAM. ADOPT and RECORD. As a result. rosiglitazone has been banned due to the risk of cardiovascular disease. The US FDA and other regulatory agencies have required clinical trials for type 2 diabetes treatments afterward. 1n this study. it is reviewed that recently developed SGL T2 inhibitors has cardiovascular benefits as a novel mechanism of type 2 diabetes treatment. SGL T2 inhibitors inhibit the renal sodium glucose co-transporter(SGLT2), thereby reducing glucose reabsorption and increasing excretion of it. and consequently lowering blood glucose levels. Recent papers on ongoing cardiovascular-related clinical trials of SGL T2 in-hibitors such as CANVAS. CANVAS-R. CREDENCE of canagliflozin, DECLARE-TIMI 58 of dapagliflozin. and EMPA -REG outcomes of empagliflozin were examined thoroughly as well.

VDSL채널에서 정규화된 MMA 방법을 이용한 블라인드 적응 등화 기법

최성환,김한기,권호열 강원대학교 정보통신연구소 2001 정보통신논문지 Vol.5 No.-

VDSL technology can transmit data at rate of 10-50Mbps over a twisted-pair copper telephone loops. Therefore, one of VDSL core technology is channel equalizer. Because one of the most damaging impairments is linear distortion introduced by cable and RF interference. An adaptive equalizer needs to be trained before reliable transfer of information can be achieved. This can be done in two main ways. One way is to using priori known training sequence. The ocher way is not to using training sequence. This type of initial training of an equalizer is called blind equalization. Blind equalization provide bandwidth-efficient schemes. In this paper we propose dual mode SCS(Soft Constraint Satisfaction)-Multimodulus algorithm derived from the combination of SCS algorithms and decision-directed algorithm. This algorithms provide fast convergence speed and robustness. Using MATLAB, we investigate the performance of dual made SCS-MMA over VDSL test loops.

Ultra-precision turning and interferometric testing process for KAONICS optical parts

Han Jeong-Yeol,Yuk In-Soo,Lee Sungho,Kim Sug-Whan,Han In-Woo,Cha Sang-Mok,Jin Ho,Park Soojong,Nam Uk-Won,Kim Geon-Hee,Yang Ho-Soon 한국우주과학회 2005 한국우주과학회보 Vol.14 No.1