인공위성 데이터를 이용한 태풍에 의한 삼림피해의 추적조사

崔勝弼,崔哲淳 관동대학교 1996 關大論文集 Vol.24 No.1

One of the common applications of remote sensing is monitoring and evaluation vegetation over the land surface, and an important mechanism for assessing vegetation condition is the Normalisted Difference Vegetation Index(NDVI) which is widely used for analyzing vegetation conditions. Therefore, the NDVI was applied to trace survey for demage of collapsed forests by typhoon using satellite data. On a 1989-1994's NDVI results derived from the MESSR sensor, a damage tracing study on collapsed forests due to typhoon was elaborated for the damaged conditions collapsed and healthy forests. As a results of this research, we obtained the grasping possibility of forests damage condition due to typhoon using satellite remotely sensed data especially inside damage. It is very important keys that can be used to investigate the damage of natural disasters and forecast the second damages of typhoon.

건축물의 용도별 오수배출 원단위 산정 : 숙박시설과 음식접객업을 중심으로

최승철,김병욱,임재명 대한상하수도학회 2003 상하수도학회지 Vol.17 No.5

The purpose of this research was to develop more reliable and accurate unit factors by investigating water use flowrates, sewage flowrates and pollutant loadings in lodgings and restaurants. Additionally, we intended to present reasonable guidelines for sewage flowrate, objective population and pollutant concentration for buildings classified by their use. The results of this study were as follows : 1) Average unit sewage flowrates were 6.0-15.9L/㎡·d, 210.4-349.8L/capita·d for lodgings, and 77.3-682.2L/㎡·d, 78.1-135.5L/capita·d for restaurants. 2) Average concentrations of biochemical oxygen demand(BOD), total nitrogen(T-N), and total phosphorus(T-P) were 140.6-496.4㎎/L, 210.0-55.5㎎/L, and 2.5-5.2㎎/L for lodgings, respectively, and 51.3-152.4㎎/L, 22.9-43.8㎎/L, and 2.0-5.5㎎/L for restaurants, respectively. 3) The results of this study indicate that it sould be desirable to separate the existing evaluation standards according to whether the guest if permitted to cook(i.e., to distinguish Hotels/Inns from Condominiums), and that it would be desirable to separate th existing evaluation standards for restaurants according to their sewage pollutant loading(i.e., high, medium, and low loading). 4) According to the results of this study, the evaluation standards adopted for the treatment facilities of lodgings were (a) sewage flowrate 33.0L/㎡·d, BOD concentration 170㎎/L, and objective population n(Number) - 0.08A(Area) in Hotels/Innes ; (b) sewage flowrated 530L/㎡·d, BOD concentration 220㎎/L and objective population n=P in condominiums ; and (c) sewage flowrate 600L/㎡·d, BOD 640㎎/L, and objective population n=1.0A in restaurants with high pollutant loadings, sewage flowrate 450L/㎡·d, BOD concentration 500㎎/L and objective population n=0.8A in restaurants with medium pollutant loadings, and sewage flowrate 170L/㎡·d, BOD concentration 270L/㎡ and objective population n=0.4A in restaurants with low pollutant loadings.

排球競技에 있어서 身長이 攻擊力에 미치는 影響에 關한 硏究

崔承哲,金鼎柱 경희대학교 체육과학연구소 1985 體育學論文集 Vol.13 No.-

The object of this study is to make the influence of height on the attacking power in Volleyball game clear. For that, a National Volleyball League for President's cup which held from January 14 to March 25, 1984 and the heights of businesses and universities male players who took part in to are dealt with as data for investigation. The players are classified into two groups according to height-the group of above average height and the group of below average. The kind of spiking which the two groups use, frequency in use of it and its success, failure and rally rate are analyzed as following. 1.Male players of business or universities used first of all open attacks (50.3%) without regard to height, and use in order of quick attacks (19.7%), feint attacks (17.1%), and time-lag attacks (12.9%). (X2 = 179.162, df = 6, p < 0.001) 2.Tall players had high rate of success (43%) and failure (20.7%), in the open attacks than short players. (X2 = 15.407, df = 2, p < 0.001) 3.Quick attacks were not much influenced by height. (X2 = 2.793, df = 2, p > 0.05) 4.Tall players had higher rate of success (54.9%) and lower rate of failure (12.2%) than short player in time-lag attacks, and so they were very favorable methods of attacking to tall p1ayer. (X2 = 6.428, df = 2, p <0.05) 5.Feint attacks were not much influenced by height. (X2 = 0.650, df = 2, p > 0.05) 6.Blockings showed 4.70% of success of players, and 3.50% of success of short players, and they were favourable method of attacking to tall players. (X2 = 29.982, df = 2, p > 0.001) 7.Height had significant positive relation with rate of success in open attacks (r = 0.3065, p < 0.05) of failure (r = 0.2064, p < 0.05) and the rate of success in blockings it has significant negative relation with the rate of failure in time-lag attacks.(r = -0.2796, p < 0.05)

외상성 기관지 가성류

이승진,이석열,박형주,이철세 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

Rupture of the main bronchus followed by blunt chest trauma is relatively rare but, with increasing traffic accidents, the incidence has been increasing recently. Early diagnosis and management for the traumatic bronchial rupture is essential to reduce morbidity, mortality and late complication but often, it is comcealed in cases of blunt chest trauma and particularly it is associated with multiple other organ injuires. Especially, bronchial pseudoaneurysm which maintains airway patency after complete transection of the bronchus by blunt chest trauma is very unusual case. We report a case of a 15 year old male who had complete bronchial transection with bronchial pseudoaneurysm.The bronchial rupture was comfirmed by spiral chest CT and 3D reconstruction. In the operation, right main bronchus was completely transected and separated but the airway was patent to the right lung by pseudoaneurysm of the bronchus. Resection of the pseudoaneurysm and end to end anastomosis of the bronchus was performed successfully.

Methylphosphonicdifluoride의 가수분해 및 가수분해 생성물로부터 HF의 회수 연구

이종철,이용한,박훈,최승주 한국화학공학회 2003 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.41 No.4

Methylphosphonicdifluoride(DF)의 최적 가수분해 조건을 찾기 위하여 염기성 및 중성 수용액에서 가수분해하고 가수분해 생성물로부터 F 화합물을 분리, 회수하였다. DF는 NaOH 수용액의 농도 6 mole, [OH]/[DF]의 비율 4 이상에서 5분 내에 80%가 분해된 반면, 중성 수용액에서는 H₂O/DF의 부피 비 1.5 이상에서 93-97%의 분해율을 보였다. 가수분해 후 생성물중의 HF를 분리하기 위하여 수산화칼슘을 사용하였으나 생성입자의 크기가 매우 작고 겔 상태로 존재하여 HF의 완전분리가 곤란하였다. 반면, 중성 수용액에서 가수분해한 DF의 생성물은 MPA, HF 및 미량의 methylphosphonofluoridic acid(MF)가 존재하였다. MPA는 휘발성이 없는 흡습성 고체이고 HF는 물과 공비점을 형성 하므로 물을 주기적으로 반응기에 공급하면서 반복 증류하여 HF를 용이하게 분리 할 수 있었다. 가수분해 생성물을 증류 한 결과 최대 99.7%의 F 이온을 분리하였으며 증류 후 회수된 불산의 최종 농도는 20% 이었다. The hydrolysis of methylphosphonicdifluoride(DF) both in NaOH solutions and neutral waters was studied to find optimum reaction conditions. Separation of F ions from the reaction products was also conducted. The destruction efficiency of DF in NaOH solutions was above 80% in five minutes at the mole ratio of [OH]/[DF]3-6, while the efficiency of 93-97% was obtained in water when the volume ratio of the H₂O/MPD was above 1.5. Ca(OH)₂ was added to to remove HF in the product solutions after DF hydrolysis in alkaline solutions but it was not easy to remove due to coagulation of the products. On the other hand, HF was easily separated by repeated distilation adding water periodically to the reactor from the reaction products of DF hydrolysis in water, 99.7% of the total fluoride ions were removed from the products by repeated distillation. The final concentration of HF solution recovered was 20wt%.

사춘기 이전의 아동에 있어서 야간 수면 중의 성장 호르몬, 코티졸 분비의 남녀 차이에 관한 연구

김진관,신철,이창규,이승관 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.1

Growth hormone is secreted episodically from the pituitary gland in relation to the onset of SWS, with maximal secretion occurring in the first half of the night, whereas cortisol secretion inhibited by SWS in the first half of night, increased in response to activation of hypothalamic-pituitary-adrenal axis tone in the second half of the night. But numerous studies have delineated association between sleep parameter and neuroendocrine function in the adult, few investigation have study in prepubertal children. As the present study, we investigated the relationship between GH, Cortisol secretion and sleep parameter during nocturnal sleep in prepubertal childrens. 19 childrenstmale 10, female 9) were recruited to study from community advertisement, performend polysomnography in sleep laboratory and serially collected 30 min interval blood sampling for hormone measurement from pm 10:00 to am 6:30. Sex difference were not significantly in total secretion of GH, Cortisol level, but GH secretion was sexually dimorphic with a more pulsatile release in female than male childrens during the second half of night. The first half of night SWS(%) was significantly correlated with integrated GH levels from 22:00 to 23:30, 24:00(r=0.532 p<0.05, r=0.55 p<0.05), the REM sleep(%) during night was significantly correlated with integrated cortisol levels (r=0.830,p<0.001), this results represent that SWS may be a partial stimulating factor of GH secretion, REM sleep may be a activation of HPA axis in prepubertal children

만성폐쇄성폐질환의 중증도와 폐고혈압 및 폐성심으로 진행과의 상관관계

김형호,박철진,이준,장광표,하성일,이재록,하재화,권세훈,권용운,윤성호,이승일 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.2

Background: From many previous studies, Pulmonary hypertension is the known independent predictive factor of the mortality in COPD. Also pulmonary hypertension is the major cardiovascular complication of COPD and is associated with the progression to cor pulmonale and poor prognosis. Author want to analyze the correlation between pulmonary hypertension and the severity of COPD which are classified by forced expiratory volume in one second, and the extent of progression to corpulmonale. Methods: Retrospectively we investigated the medical records of 118 patients with COPD who had pulmonary function test and echocardiogaphy more than one times during one-year follow-up (from June, 2005 to May, 2006) at respiratory division in chosun university hospital, and then 50 patients were enrolled in this study. We classified the severity from FEVl in pulmonary function test based on the GOLD guideline, also this was comparably analyzed with RVSP, RVIDd, Visual Grading from echocardiography. Results: 16 patients out of 50 were classified as moderate severity, 25 patients were severe, and 9 patients were very severe group. RVSP was higher in more severe groups than less severe groups but when it comes to pulmonary hypertension that RVSP is over 35 mmHg, there was no valid difference lies in those groups. As FEVl decreases RVSP and RVIDd increases, and observed relationship between RVSP which was classified as below 35 mm and above 35 mm groups and visual grading which was classified as normal and dilatated groups revealed valid correlation, Conclusion: As pulmonary function decreases, progression to pulmonary hypertension and cor pulmonale increases but there was no remarkable difference of prevalence in above moderate severity groups. 연구배경 폐고혈압은 이전의 많은 연구에서 만성폐쇄성폐질환에서 독립적인 사망의 예측인자로 알려져 있다. 또한 폐고혈압은 만성폐쇄성폐질환의 주요한 심혈관계 합병증이며, 폐성심으로의 진행 및 불량한 예후와도 관련되어 있다. 이에 저자는 폐고혈압과 1초간 노력성호기량으로 분류되는 만성폐쇄성폐질환의 중증도 및 폐성심으로의 진행 정도를 비교 분석하여 이들의 상관관계를 밝혀보고자 한다. 방법 2005년 6월부터 2006년 5월까지 1년 동안 본 병원 호흡기 내과에서 폐기능검사와 심장초음파 검사를 각각 1회 이상 시행한 적이 있는 118명에 한하여 의무기록을 후향적으로 조사하여 이 중에서 50명을 대상으로 하였다. 폐기능검사 시행 결과 얻은 1초간 노력성호기량을 바탕으로 GOLD guideline에 따라 중증도를 분류하였으며 이를 심초음파 시행 결과 얻은 우심실수축기압, 확장기말 우심실내부간격, 시각등급과 비교분석하였다. 결과 대상 환자 50명중 16명은 중등증, 25명은 중증, 9명은 최고중증 그룹으로 분류되었다. 우심실수축기압은 중증도가 높은 그룹에서 낮은 그룹에 비해 더 높게 나타났으나 폐고혈압에 해당하는 우심실수축기압이 35 mmHg이상인 환자에 있어사는 각 그룹간에 유의한 차이를 보이지 않았으며, 확장기말 우심실내부간격, 시각등급 또한 중증도와 유의한 차이를 보이지 안항ㅆ다. 1초간 노력성호기량이 감소함에 따라서는 우심실수축기압, 시각등급은 증가하였으며 우심실수축기압을 35mmHg 미만과 이상인 그룹으로, 시각등급을 정상과 확장이 있는 그룹으로 분류하여 비교한 결과에서는 유의한 상관관계를 나타냈다. 결론 폐기능이 감소할수록 페고혈압 및 폐성심으로의 진행이 증가하였으나 폐기능검사에서 중등도 이상의 그룹에서 유병률의 차이는 크지 않았다.

고분자튜브용 Single-Screw 압출시스템의 동적특성 해석

김재열,정효희,최승현,최진호,홍철 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

Today, Screw model used in extrusion molding of to analyze various simulation notations as well as an experiments use, and is using because among them, third dimension technique among present technique accomplishes most troop. Because that third dimension uses technique does not attain explanation that is correct in model who curt analysis notation on two-dimension has complex shape structure. Is studying measurement of shape of extruder of complicated structure or frictional force of polymer balance and density, applied mechanism accordingly using third dimension technique. Single screw system, analysis target of this treatise, is extruder that extrusion molding that use most polymer resin consists. Most single screw extruder is excellent transfer in melting state of polymer balance, but there are some shortcomings. Melting of polymer balance and color dithering of balance are difficult and high heat of increase of screw speed of revolution to increase done balance quantity produces anaphora along with unmeasured shear force increase. Single screw that have this a lot of controversial points in addition to achieving dynamic analysis of single screw extruder of polymer tube that get into nature of a treatise that use CFdesign that is heat/flow analysis program production stability in single screw extruder system for polymer tube analysis achieve wish to.

성인 남성에 있어서 수면 무호흡 증후군에 예측인자에 관한 연구

김진관,신철,이승관,이창규 高麗大學校 倂設 保健大學 保健科學硏究所 2001 保健科學論集 Vol.27 No.2

Obstructive Sleep Apnea Syndromes (OSAS) is charicterized by episodes of complete or partial pharyngeal obstruction during sleep. Epidemiological studies estimate that 2 to 5% of the population meet the minimal diagnostic criteria, and some community based studies have found that about 2% of women and 4% of men between 30 and 60 years old are affected by OSAS. We studied 150male OSAS patient during a period of one year and recorded age and anthropomorphic data. We performed polysomnography. Several polysomngrophic data were compard between OSAS and control group. There were differences in sleep indices such as sleep stage 1, stage REM LDP, snoring, Aarousal index and RDI between two group. RDI and LDP correlated positively with BMI WHR chest circumference and Neck circumference. It can be concluded that obesity is a predisposing risk factor of OSAS.

항균성 도자기 소지의 개발

문종수,이승철,이경석 慶南大學校 附設 工業技術硏究所 1999 硏究論文集 Vol.17 No.-

일반적으로 건축용 도자기 소지는 항균성이 없기 때문에 시설물의 습기가 많은 곳에 사용하거나 대중이 이용하는 시설에 사용했을 경우 많은 병원균의 오염 때문에 매우 위험하다. 건축용 도자기 뿐 만 아니라 일반 도자기 소지에 항균성을 가지도록·하는 것은 매우 흥미 있는 연구의 대상이다. 일반 도자기 소지에 항균성을 가지는 물질인 TiO₂,Ag(NO₃)₂, Cu(NO₃)₂그리고 Zn(NO₃)₂를 사용하여 몇 가지 조성으로 첨가하여 도자기 소지체의 시험 편을 제조했다. 이 시편을 열처리 한 후 물리적 성질을 측정하고, 또한 대장균, 고초균, 녹농균 및 화농균 등에 대한 항균성을 측정하였다. 모든 시험 편이 대장균에 대하여서는 양호한 항균성을 나타내었고. 화농균. 녹농균과 고초균에 대하여서는 일반적으로 TiO₂가 50% 이상 첨가된 시료를 제외한 전 시료에서 양호한 항균성을 보였다. 본 연구에서는 항균성 물질을 여러 가지 방법으로 조합한 후 적당량 첨가하여 항균성이 우수한 도자기 소지를 제조하였다. When we have used the general pottery bodies at the wet places such as toilets, public bath, hospitals and etc, bacteria and microbe may attack the body easily. Therefore, it is very important study to develop a antibacterial ceramic materials. We have fabricated the antibacterial pottery bodies with the several antibacterial materials such as TiO₂,Ag(NO₃)₂, Cu(NO₃)₂and Zn(NO₃)₂. Thermal analysis and X-ray diffraction analysis were performed to investigate the behaviors of crystalline transition of samples. Antibacterial tests were performed for escherichia coli, bacillus subtilis, pseudomonas aeruginosa and pyogenic bacillus. It was found that all samples had excellent antibacterial properties for escherichia coli and except 50% of TiO₂,Ag(NO₃)₂, Cu(NO₃)₂and Zn(NO₃)₂ for bacillus subtilis, pseudomonas aeruginosa and pyogenic bacillus.