열전도도 차를 이용한 실리콘 절대 습도 센서 (2)

이승환 忠州大學校 2004 한국교통대학교 논문집 Vol.39 No.1

In this paper, a silicon micromachined absolute humidity sensor is researched in terms of short-term stability. The sensing mechanism of this sensor uses the thermal conductivity difference of air itself and the air with the amount of water vapor. The micro-heater made by using Pt/Ta_(x)O_(y) bilayer, which is annealed in air ambient for 1 hour at 650℃ temperature, shows an excellent short-term stability. After temperature compensation, the humidity sensor follows one characteristic output voltage curve according to absolute humidity value. The sensitivity of absolute humidity sensor is decreased from 0.534 mV/[g/㎥] to 0.375 mV/[g/㎥] in the temperature range from 25℃ to 55℃ respectively.

熱傳導度 差를 利用한 실리콘 絶對 濕度 센서

李承煥,安台煥,安大植 충주대 2004 産業科學論文集 Vol.12 No.-

We research on a silicon micromachined absolute humidity sensor in this paper. The sensing mechanism of this sensor uses the thermal conductivity difference of air itself and the air with the amount of water vapor. The micro-heater made by using Pt/Ta_(x)O_(y) bilayer, which is annealed in air ambient for 1 hour at 650 ℃ temperature, shows an excellent short-term stability. After temperature compensation, the humidity sensor follows one characteristic output voltage curve according to absolute humidity value. The sensitivity of absolute humidity sensor is decreased from 0.534 mV/[g/㎥] to 0.375 mV/[g/㎥] in the temperature range from 25 ℃ to 55 ℃ respectively.

도시공원의 이용후 평가에 기초한 공원의 개발지표 설정 : 부산광역시 암남공원을 사례로 Case Study of Amnam Park in Busan City

박승범,김승환,남정칠,강영조,이기철,김석규 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.2

The purpose of this study is to investigate the prime factors that affect to user postoccupancy evaluation of activities and facilities in urban parks, to classify those factors, to find out factors about them, and then to suggest important indicators in the urban park planning, design, and development. The survey research was done using the self-administered questionnaire method by 435 peoples in the Busan City who participated in recreational activities in the Amnam Park. The Analysis of the data primarily consists of two phase: The first analysis was dealt an exploratory factor analysis which identified major factors involved in user postoccupancy evaluation with reacreational activities and facilities in Amnam Park by the SPSS(Ver.6.0) program and the second analysis was used to investigate the factors affected to user postoccupancy evaluation in the urban park by the Regression Analysis. According to the factor analysis, user postoccupancy evaluation of facilities in urban parks concerning the 20 variables, 5 prime factors by the staistical values were considered. The factor analysis showed that user postoccupancy evaluation of activities in urban parks concerning the 11 variables, 3 prime factors by the staistical values were analysed. Postoccupancy evaluation in the urban park by the Regression Analysis suggested that the two varlables as 'the directions of park development' and 'companies with the personal specific characteristics' are significant in addition to the some variables presented in user postoccupancy evaluation with reacreational activities and facilities in Amnam Park by the factor analysis. Furthomore the analysis models were identified as having significant effects on the factor and regression analysis. Overall fits of both models were very good. These significant relationships indicate important factors and variables that should be considered in planning, design, and development of the urban parks. Therefore, development direction of the h a m park has to be analyzed as significant factors concerning user postoccupancy evaluation in a systematic way, recognized as important variables for planning process. The urban park has to be fully designed and established in the planning process not by the decision-maker's subjective evaluation but by user postoccupancy evaluation.

파트너십에 의한 지하철 입구 공간의 쌈지공원 설계 및 시공

김승환,강현우,손용욱,박승범,남정칠,이기철,차민준 東亞大學校 建設技術硏究所 2009 硏究論文集 Vol.32 No.2

A pocket park is valued in securing green space in downtown and improving urban view in the aspect of natural and environmental values, and it signifies a lot as the center of local residents’ community and harmony as well. Since subway exits and surroundings that have high portions in taking up street space due to lack of green space in downtown aren't made full use of, valuable pocket park place. Dangni Pocket Park of subway exits is a park completed with cooperative works and partnership by students, specialists, administrative organizations, businesses and civilian organizations, etc. without support of special budget. The study site was finally chosen to the space between exit No.1 of Dangni subway station, after analyzing the surrounding circumstances, availability and accessibility of the space among the several subway station exits of Saha, Dangni, and Hadan Station in Busan Metropolitan city. For the designing process, The Citizens organization for Million Amenity Park performed the planning and project proceeding, and 19 design drafts were proposed during the class of landscape architecture in Dong-a University. Design review panel members discussed to select the best draft in practical and authentical, and the related experts reviewed and revised to present the final design plan. The construction was conducted was performed under the cooperation between the civil, authorities, and industrial organizations, among which Saha District office managed for the waste treatment and maintenance matters. The graduates of landscape architecture department of Dong-a University and related industrial enterprises supplied landscape materials and related labors, were supported by 20 members of GPM, one of clubs of Dong-a University volunteered durig the most of construction progress, completing the Pocket Park of subway exits through partnership.

기장군 녹화마스터플랜 및 가로수 기본계획

박승범,김승환,남정칠,강영조,이기철 東亞大學校 建設技術硏究所 2008 硏究論文集 Vol.32 No.1

본 계획은 급격한 도시화와 자연환경파괴의 과정에서 쾌적한 도시를 만들기 위한 도시의 녹지보전 및 확보가 중요한 과제로 정착하기 시작하는 움직임에 맞추어 도시의 녹화문제를 종합적으로 해결하기 위한 방안을 모색하고자 하였다. 본 계획에서 제시한 안은 현행의 관련법제가 뒷받침되지 못하는 관계로 법정계획에는 해당되지 않는다. 그러나 계획 추진 주체의 실천의지에 따라 그 실효성은 달라질 수도 있다. 따라서 본 계획은 향후 도시재정비계획시의 방향설정 및 공원녹지와 관련한 세부 분야의 근거가 되는 계획으로 활용이 가능할 것이다. 뿐만 아니라, 공원녹지 전반에 걸친 정비계획, 중장기 예산계획의 수립, 그리고 관련법 조례 등의 근거로 활용되기를 기대한다.

응급의료센터의 단기입원치료실 활용경험

최승필,박승현,정시경,박규남,김영민,김세경,이운정,이환 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Overcrowding of emergency department is a serious and growing problem at St. Mary's Hospital. This has motivated the development of short-stay unit(SSU) as an alternative ward to routine hospital admission and ED discharge. In our hospital a SSU begun to admit patients in January 6, 1997. The SSU received 247 patients from the ED during the eight month interval(January 6, 1997 to August 31, 1997). To examine the utilization of the SSU in ED, we retrospectively analyzed 247 patients admitted in SSU from the ED, and compared the average hours per patient with acute gastroenteritis spent in the ED during the 2-month intervals before(July-August 1996) and after(July-August 1997) the establishment of the SSU. The following results were obtained; 1. The total patients consist of EM 92(37.2%), GS 48(19.4%), IM 24(9.7%), PS 21(8.5%), OS 20(8.1%), OBGY 14(5.7%) and others 28(11.3%) 2. The results of EM patients admitted in SSU from ED 1) Sex ratio of male to female was 1:1.1 and the mean age was 37.3±16years 2) In diagnosis, acute gastroenteritis was 29 cases(31.5%), multiple contusion 14 cases(15.2%), drug intoxication 12 cases(13%), limb laceration 6 cases(6.5%), tendon rupture of hand 6 cases(6.5%), and others 19 cases(20.6). 3) Mean length of stay in ED was 9.18 hours. 4) Among 92 patients to the SSU, 79 patients(85.9%) were discharged, 11 patients(11.9%) formally admitted to hospital and 2 patients(2.2%) transferred to otherhospital. The mean hospital stay time of the patients admitted to SSU was 2.6 days. 3. There was a significant reduction in the average stay time spent in the ED by treat-and-releasing patients with acute gastroenteritis after the establishment of the SSU(from 14.65±9.6 to 7.52±5.4 hr/patient, p<0.001). Conclusively, the establishment of the SSU can shorten the average stay time that treat-and-releasing patients spend in the ED, and reduce the number of admitted patients waiting in the ED.

타원형 광 도파관의 광학적 특성 해석

김진호,이승환 한국교통대학교 2014 한국교통대학교 논문집 Vol.49 No.-

In this study, the optical properties of elliptical light waveguide was analyzed in order to build NDIR (Non-dispersive Infrared Ray) gas sensor and the effectiveness of hemi-elliptical structure was compared to the structure that had a long optical path-length structure. When the reflectivity of surface assumed to have 0.97, the efficiencies of light intensity showed 41 % and 83.3 % in hemi-elliptical structure and in full-elliptical structure, respectively. The sensitivity of CO2 gas presented 270 ㎶/ppm in hemi-elliptical structure and 168 ㎶/ppm with a long optical path length structure. From the experimental results, the elliptical structure with the focused beam would enhance the output voltage and also the sensitivity of NDIR gas sensor.

도시공원녹지의 계절별 토양특성이 곰솔의 생육에 미치는 영향

김석규,박승범,남정칠,김승환,이기철 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.29 No.2

The purpose of this study is to clarify correlations between soil environments and the growth of trees in urban park and green areas and thereon analyze effects of seasonal changes in such environments on such growth. To determine seasonal factors of soil affecting the vitality of Pinus thunbergii, first of all, the study designated the vitality as a dependent variable and soil hardness, moisture, pH, K, Na, Mg and Ca as independent variables. Then the study performed Pearson's coefficient analysis. Based on findings from the analysis, the multiple regression analysis were carried out. The result of the study can be described as below; When correlations between the independent and dependent variables were examined using Pearson's correlation analysis, it wa found that the vitality, soil hardness, K, Na, Mg and Ca were significant at the level of 5%. Among those significant variables, the vitality and Mg were most correlated with the coefficient of 0.415, while K and Mg were least correlated with that of -0.235. Considering findings from the coefficient analysis, this researcher performed multiple regression analysis to determine soil factors influencing the growth of Pinus thunbergii. As a result. it was found that the growth was most influenced by Mg, followed by soil hardness and Ca in order. To clarity what soil factors influence the growth of Pinus thunbergii in spring, the researcher carried out multiple regress ion analysis to find that the growth was most influenced by pH. followed by soil hardness. Then the researcher applied multiple regression analysis to determine soil factors influencing the growth mentioned above in summer. The analysis showed that no soil factors affected the vitality at the significance level of 5% for t. Concerning relative importance based on the standard regressive coefficients, or β, K had the coefficient of 0.437 suggesting it was relatively more influential comparing to the other independent variables. Soil factors which influence the growth of Pinus thunbergii in fall were determined through multiple regressive analysis to find that the growth was influenced by soil hardness in the same season. Also such factors as affecting the growth mentioned above in winter were clarified using multiple regressive analysis to show that the growth was most influenced by soil hardness, followed by Mg, pH and Ca in order. In conclusion soil hardness had effects on the growth of Pinus thunbergii throughout four seasons except summer. Thus soil hardness is the most important factor for the growth of Pinus thunbergii. 본 연구는 도시공원녹지의 토양환경과 수목생육과의 상관관계를 구명하고, 계절별 토양 특성의 변화가 수목의 생육에 미치는 영향을 분석하고자 하였다. 곰솔의 수목활력 도에 영향을 미치는 계절별 토양인자를 알아보기 위하여 수목활력 도를 종속변수로 지정 하고 토양경도, 토양수분함량, 토양 pH , K, Na, Mg,Ca함량을 독립변수로 지정하여 Pearson 상관 분석을 수행한 후, 그 결과를 이용하여 다중 회귀분석을 실시하였으며 그 결과는 다음과 같다. 1) 각 변수들 간의 Pearson 상관분석을 실시한 결과, 유의확률 값 5%수준에서 유의한 변수는 수목활력도와 토양경도, K, Na, Mg Ca로 나타났다. 유의한 변수들 중 에서 수목활력도와 Mg가 상관계수 0.415로서 상관성 이 높게 나타났고 K와 Mg가 상관계수 - 0.235 로 상관성이 가장 낮게 나타났다. 2) 상관분석 결과를 바탕으로 곰솔의 생육에 미치는 조사지의 토양인자를 알아보기 위해 다중 회귀 분석한 결과, 경도, Mg, Ca가 수목활력 도에 유의적인 영향을 미치는 것으로 판단할 수 있었으며, 곰솔의 생육에 영향을 미치는 토양인자는 Mg, 토양경도, Ca 순으로 나타났다. 3) 곰솔의 생육에 영향을 미치는 봄철의 토양특성은 pH, 토양경도 순으로 나타났고, 곰솔의 생육에 영향을 미치는 여름철의 토양 특성은 없는 것으로 나타났으며, 곰솔의 생육에 영향을 미치는 가을 철 의 토양특성은 토양경도로 나타났고, 곰솔의 생육에 영향을 미치는 겨울철의 토양특성은 토양경도, Mg,pH, Ca 순으로 나타났다. 본 연구의 결과, 곰솔의 생육에 영향을 미치는 토양특성 중에서 토양경도는 여름을 제외한 모든 계절에 영향을 미치는 중요한 토양인자로 나타났다.

암남공원의 식물상과 삼림식생에 관한 연구

남정칠,박승범,김승환,강영조,이기철,이정아 동아대학교 환경문제연구소 1999 硏究報告 Vol.22 No.1

The objective of this study is to analyze the flora and forest vegetation of Amnam urban natural Park. 10 transects of quadrat of 10×10m were selected for the experiment. They were surveyed from January to October 1997. The obtained results were summerized as follows ; 1. The flora of plants distributed in Amnam Park was 88 families, 245 genus, 374 species. Dicotyledom in an angiosperm was 81.3% of total percentage was 73 families, 194 genus, 304 species, Monocotyledonous plant was 13.9% of total percentage was 7 families, 38 genus, 52 species, Gymnospermous plant was 2.1% of total percentage was 4 families, 5 genus, 8 species. Pteridophyta was 2.4% of total percentage was 3 families. 7 genus, 9 species, Shave grass was 0.3% of total percentage was 1 family, 1 genus, 1 species. 2. The representative wood plants of Amnam Park were Pinus thunbergii, Machilus thunbergii, Camellia japonica, Quercus spp., Celtis sinensis, Morus bombysis, Prunus sangentii, Sorbus alnifolia, Albizzia julibrissin, Juniperus rigida, Platycaya strobilacea, Lespedeza spp., Zanthoxylum piperitum, Zanthoxylum schinifolium, Rhus spp., Carpinus coreana, Mallotus japonicus. Ficus erecta, Pittosporum tobira, Eurya japonica. Elaeagnus macrophylla. 3. The area of plant community in Amnam Park was 84.29% in Pinus thunbergii community. 6.7% in Quercus dentata-Celtis sinensis community, 1.5% in Pittosporum tobira-Eurya japonica community, 1.4% in Quercus aliena-Prunus sargentii community, 1.29% in Pinus thunbergii-Pittosporum tobira community, 1.27% in Pinus thunbergii-Eurya japonica community.

乘鹤山 들쥐類의 生態에 관한 硏究

南廷七,朴承節,金承煥,李其哲 東亞大學校 建設技術硏究所 2006 硏究論文集 Vol.29 No.2

This study was conducted four ecological survey of field mice of in Mt. Sunghak Busan City from October, 2004 to July, 2005 for the understanding of field mice damage to forest. The results are obtained as follows. 1. The species of field mice collected were Apodemus agrarills, and Eofhenomys regulus. 2. The total collecting rate were 2.5% collected 13 individuals of field mice from 510 trap. 3. The rate among the 13 field mice collected were 69.2% in Apodemlls agrarills, and 30.8% in Eothenomys regulus. 4. The constitution of weight of field mice was 18-4 1.9g in Apodemus agrarius and Eothenomys regulus. 5. The sex ratio of field mice was 55.6% 44.4% in Apodemus agrarills, and 25.0% 75.0% in Eothenomys regulus. 6. The average body, tail, hind foot, ear lengh was 9 1.0mm, 77.22mm, 20.22mm, 13.33mm in Apodemus agrarius, and 93 .5mm, 39.0mm, 18.25mm, 13 .0mm in Eothenomys regltllls. 7. The breeding period of field mice in Mt. Sunghak presumes from about April. 8. The average litter size of field mice was 5.0 in Eothenomys regulus.