지방 2차병원 응급실 내원환자의 특성

안현철 순천향의학연구소 2001 Journal of Soonchunhyang Medical Science Vol.7 No.1

This study was carried out to investigate the characteristics of emergent patients and to contribute the efficient management of emergency medical services in a secondary hospital. The subjects were 16,780 patients visiting the emergency room of a 130-bed local hospital located in Ansung, Kyunggi province during recent one year. The results were as follows: 1. While the highest urgent patients by age groups were over 60 years(9.3%) and 50 - 59 years(4.5%) in order, the highest emergent patients in male(3.2% and 3.3%) were significantly higher than in female(2.4% and 2.2%)(p<0.001). 2. The most frequent arrival time of urgent and emergent patients were on 11 p.m. - 3 a.m. and on 4 a.m. - 8 a.m., respectiverly. 3. The rates of urgent patients by causes of diseases were predominant in traffic accident (10.3%) and in other injury(6.0%), and those of emergent patients were in other injury (9.7%) and in traffic accident(7.1%). 4.The rates of urgent and emergent patients were significant higher in transfer-in patients(22.1% and 25.0%) than in direct visiting patients(both 2.3%)(p<0.001). 5. The rates of urgent and emergent patients among the visiting patients were 2.9% and 2.8%. Consequently, there were insufficient and inappropriate roles and functions of this emergency room. Therefore, further studies for the evaluation of emergency medical service system, roles and functions in emergency room for local hospitals would be recommended.

계통 연계형 인버터의 LVRT제어 시 과도전류 분석

안현철(Hyun-Chul Ahn),송승호(Seung-Ho Song),최주엽(Ju-Yeop Choi) 전력전자학회 2013 전력전자학술대회 논문집 Vol.2013 No.7

지리산국립공원 주요계곡부의 관속식물상

안현철,안주언,박삼봉,조현서,안종빈,박정근,김봉규,박은희,김임규,추갑철 경상대학교 농업생명과학연구원 2014 농업생명과학연구 Vol.48 No.4

To investigate the distribution of vascular plants growing at four major valley of JirisanNational Park such as Daesung-valley, Pia-valley, Chilseon-valley, and Baemsa-valley, wesurveyed a total of 40 times from May in 2012 to November in 2013. The flora ofDaesung-valley was classified as a total of 421 taxa comprising of 103 families, 339 genus, 367species, 4 subspecies, 42 varieties, 6 forma. A total of 449 taxa in the Pia-valley wereinvestigated as 98 families, 267 genus, 385 species, 5 subspecies, 51 varieties, and 8 forma. The flora of Chilseon-valley was classified as a total of 503 taxa consisting of 105 families,302 genus, 448 species, 3 subspecies, 45 varieties, and 7 forma. The Baemsa-valley wasconsisted of a total of 735 taxa comprising of 98 families, 252 genus, 361 species, 3subspecies, 43 varieties and 9 forma. The korean rare and endangered plant species designatedby the Korea Forest Service were investigated as 30 species from four major valleys. Theendemic plants in Korea were investigated as 20 taxa comprising of 14 families, 18 genera, and20 species. The floristic special plants were a total of 128 taxa such as 53 taxa in class I, 24taxa in class II, 29 taxa in class III, 12 taxa in class Ⅳ, and 10 taxa in class Ⅴ. 본 연구는 지리산국립공원 4개 계곡지역의 관속식물상을 2012년 5월부터 2013년 11월 까지 총 40회조사를 실시하였다. 본 연구 대상지역에 분포하는 관속식물의 출현은 대성골에서는 103과 339속 367종4아종 42변종 6품종 419분류군, 피아골에서는 98과 267속 385종 5아종 51변종 8품종 449분류군, 칠선계곡에서는 105과 302속 448종 3아종 45변종 7품종 503분류군, 뱀사골에서는 98과 252속 361종 3아종 43변종 9품종 416분류군으로 모두 117과 391속 647종 5아종 74변종 9품종 735분류군이 출현하였다. 4개 계곡 지역에서 산림청지정 희귀멸종식물은 30종이 출현하였으며, 특산식물은 14과 18속 20종20분류군이 출현하였고, 식물구계학적 특정식물은 Ⅰ등급에서는 53종, Ⅱ등급에서는 24종, Ⅲ등급에서는 29종, Ⅳ등급에서는 12종, Ⅴ등급에서는 10종, 총 128종류가 출현하였다.

에폭시/유리섬유가 주성분인 인쇄회로기판(PCB)의 열분해 특성에 대한 연구

안현철,김승도,장은석,김경수,김상범,김미란 한국폐기물자원순환학회 2006 한국폐기물자원순환학회지 Vol.23 No.1

지리산(智異山) 물박달나무림(林)의 식생구조(植生構造)와 동태(動態)

안현철,이정환,Ahn, Hyun-Chul,Lee, Jeong-Hwan 한국산림과학회 1998 한국산림과학회지 Vol.87 No.3

본 연구는 지리산 국립공원 오봉리 지역에서 집단적으로 분포하는 물박달나무림의 식생구조와 동태를 분석하여 물박달나무림의 경영과 분포지에 대한 정보를 제공하기 위하여 수행되었다. 그 결과 물박달나무림의 구조는 교목층(18종류), 아교목층(29종류), 관목층(43수종) 그리고 초본층(68종류)으로 구성되어 있다. 층위별 중요치는 교목층에서 물박달나무가 129.97%로 가장 높고 다음으로 물오리나무(49.04%), 밤나무(25.58%), 졸참나무(25.02%), 노각나무(14.49%), 아교목층에서 물박달나무(70.81%), 졸참나무(37.47%), 물푸레나무(25.35%), 비목나무(24.52%) 및 노각나무(18.86%)가 높은 우점을 보였고, 관목층에서는 조릿대(28.28%), 비목(24.94%), 개윷나무(20.42%), 국수나무(19.90%), 그리고 초본층에서는 오미자(18.51%), 참취(12.26%), 애기나리(10.63%)로 우점하고 있었다. 30개 조사방형구에서 전층을 대상으로 출현 비출현에 의한 17수종에 대한 $x^2$ 검정결과 굴참나무-상수리나무, 노각나무-검노린재나무, 당단풍-신갈나무간에는 고도의 유의성이 인정되었다. 또 밀도에 의한 Pearson 상관에서는 $x^2$ 검정에서 보다, 많은 7개 쌍의 유의성이 인정되었고, Spearman 상관에서는 모두 18개의 상관이 있는 쌍이 인정되었다. 물박달나무림에 대한 직경급의 분포는 물박달나무림의 지속이 계속될 것으로 예상되지만 치수 발생량이 거의 없어 앞으로 졸참나무, 노각나무 등 교목층과 아교목층을 형성하고 있는 활엽수종과 경쟁에 의하여 천이가 있을 것으로 사료된다. The present study focused on the vegetation structure and dynamics of Betula davurica forest were to provide the information for management, distribution and utilization of B. davurica forest in Mt. Chiri national park, southern Korea. The layer structure of B. davurica forest were consist of tree layer(18 species), middle layer(29 species), shrub layer(43 species) and herb layer(68 species). According to the importance value of stratification of layers, In tree layer, B. davurica dominant the highest value of 123.97%, Alnus hirsuta 49.04., Castanea crenata 25.58%, Quercus serrata 25.02%, Stewartia koreana 14.49%, in middle layer were B. davurica 70.81%, Q. serrata 37.74%, Fraxinus rhynchophylla 25.35% Lindera erythrocarpa 24.52%, S. koreana 18.86%, shrub layer were Sasa borealis 28.28%, L. erythrocarpa 24.94%, Rhus trichocarpa, 20.42%, Stephanandra incisa 19.90% and herb layer Schizandra chinensis 18.51%, Aster scaber 12.26%. Disporum smilacinum 10.63% etc, respectively. Results of chi-square test statistics based on presence-absence parameters, the positively associated species pair were Quercus variablis - Q. acutissima, Stewartia koreana - Symplocos paniculata, Acer pseudo-sieboldianum - Quercus mongolica. And covariation was calculated based on quantitative measure of density. The results showed that the association and covariation values among species not agreed with each other. The frequency distribution of DBH Betula davurica species showed reverse J-shaped, therefore it's seems to retrain as a dominant species. When predicting succession in Betula davurica forest, it is seedling and saplings were not richness, succession was governed by competition of hardwood species of subtree and tree layer.

집단지성의 사용자 수용에 영향을 미치는 요인에 관한 연구

안현철(Hyunchul Ahn),이형용(Hyoungyoung Lee) 성신여자대학교 경영연구소 2008 경영관리연구 Vol.1 No.2

최근 Web 2.0의 기술적 기반의 발전으로 인해, 집단지성의 생성 및 활용이 다양한 영역에서 활발하게 이루어지고 있다. 특히 위키 프로젝트의 가장 대표적인 성공사례라고 할 수 있는 위키백과(Wikipedia)는 이제 백과사전의 대명사인 브리태니커 사전의 폭과 깊이를 능가할 정도로 지식의 품질을 인정받고 있으며, 전세계의 많은 사용자들이 지식의 원천으로 활용하고 있다. 하지만, 위키백과에서 제공되는 지식은 개방된 시스템에서 사실상 통제 없이 생성되는 지식이므로, 여러 종류의 위험이 내포될 수 있다는 목소리 역시 최근 들어 점차 커지고 있는 추세이다. 때문에, 천성적으로 불완전성을 내포할 수 밖에 없는 집단지성을 통한 지식에 대해 사용자들이 그 지식을 수용하는 원리를 이해하고, 주요 영향요인을 살펴보는 것은 학문적으로 중요한 의미를 가진다. 이에 본 연구는 위키백과의 사용자들에 대한 설문 연구를 통해, 집단지성에 대한 사용자의 수용 태도에 영향을 미치는 요인으로는 어떤 것들이 있는지 살펴보고, 그 경영학적 의미를 고찰해 보고자 한다. The use of collective intelligence proliferates recently due to the continuous innovation of Web 2.0 technologies. In particular, Wikipedia - an Internet-based, user contributed encyclopedia - has become the most successful case of Wiki projects. Some pioneering users participate in creating contents of Wikipedia, and a lot of Internet users use these contents as a source of their knowledge. Some research insist that the accuracy of Wikipedia and Encyclopedia Britannica are roughly equivalent today. Nonetheless, some people are concerned about the reliability of an uncontrolled reference work that may include any number of purposeful or accidental inaccuracies. Thus, it is required to understand "how people accept the knowledge from collective intelligence" in order to facilitate the use of collective intelligence. In specific, it is a good research topic to identify the factors that affects user acceptance of collective intelligence from the users" perspectives. In this study, we explore these factors by analyzing the survey on the users of Wikipedia, and analyze their managerial implication.

지리산 물박달나무림의 식생구조와 동태

안현철,이정환 ( Hyun Chul Ahn,Jeong Hwan Lee ) 한국산림과학회 1998 한국산림과학회지 Vol.87 No.3

The present study focused on the vegetation structure and dynamics of Betula davurica forest were to provide the information for management, distribution and utilization of B. davurica forest in Mt. Chiri national park, southern Korea. The layer structure of B. davurica forest were consist of tree layer(18 species), middle layer(29 species), shrub layer(43 species) and herb layer(68 species). According to the importance value of stratification of layers, In tree layer, B. davurica dominant the highest value of 123.97%, Alnus hirsuta 49.04., Castanea crenata 25.58%, Quercus serrata 25.02%, Stewartia koreana 14.49%, in middle layer were B. davurica 70.81%, Q. serrata 37.74%, Fraxinus rhynchophylla 25.35% Lindera erythrocarpa 24.52% , S. koreana 18.86%, shrub layer were Sasa borealis 28.28%, L. erythrocarpa 24.94% . Rhus trichocarpa, 20.42%, Stephanandra incisa 19.90% and herb layer Schazandra chinensis 18.51%, Aster scaber 12.26%. Disporum smilacinum 10.63% etc, respectively. Results of chi-square test statistics based on presence-absence parameters, the positively associated species pair were Quercus variablis - Q. acutissima, Stewartia koreana - Symplocos paniculata, Acer pseudo-sieboldianum - Quercus mongolica. And covariation was calculated baste on quantitative measure of density. The results showed that the association and covariation values among species not agreed with each other. The frequency distribution of DBH Betula davurica species showed reverse J-shaped, therefore it`s seems to retrain as a dominant species. When predicting succession in Betula davurica forest, it is seedling and saplings were not richness, succession was governed by competition of hardwood species of subtree and tree layer.

農山村 零細私有林所有者의 經營意識에 關한 調査

安鉉哲 진주산업대학교 1983 論文集 Vol.21 No.-

農山村 零細山主를 對象으로 私有林經營意識에 關하여 調査한 結果를 要約하면 다음과 같다. 1. 山林의 所有動機나 形態로 보아 相續山主가 72.7%, 個人所有의 山林이 84.9%로서 造林을 目的으로 山林을 所有하고 있는 山主는 全體의 18.9%에 不過하여 大部分 山林이 林業以外의 目的으로 所有되고 있는 反面, 62.3%의 山主가 山林 所有規模의 擴大意思를 보였다. 2. 自力造林의 意思를 갖고 있는 山主는 全體의 17.9%에 不過한데, 그 理由는 收益性보다는 貯蓄性動機에 起因하고 있으며 資本不足을 理由로 自力造林을 하지 않겠다는 山主는 무려 71.3%나 된다. 한편, 調査對象 山主의 26.4%만이 營林計劃에 依하여 造林이나 撫育作業을 實施하며 山林當局으로 부터 技術指導를 받은 山主는 23.6%, 造林費 融資惠擇을 받은 山主는 14.2%로 나타났다. 3. 所有山林에 成熟木이 있을 境遇 伐採意思를 갖고 있는 山主는 21.7%에 不過한데, 그 理由는 伐採許可節次의 煩雜性과 低收益性 等에 起因하고 있으며, 調査對象山主의 73.6%가 燃科의 91∼100%를 林産燃科에 依存하고 있다. The study was conducted to find out the origins, types and purposes of small­scale private forest ownerships, and their attitudes toward forest practices. The necessary information was gathered by interviewing 106 private forest owners in Geo Chang­Gun, Kyungnam. 1. Most of private owners were far from proper forest management, because about 73 percent of forest ownership were for ancestor's forest and about 85 percent of individual and private owners that intended to reforest were not more than 19 percent of total and about 62 percent of private owners intended to enlarge their properties. 2. The owners, who intended to plant trees at their own expenses, were not more than 18 percent of total. This was due to the lack of capital(71percent) and for providing new planting sites and capital, about 26 percent of the private owners wanted immediately to cut the standing trees, and about 24 percent of private owners were got the technical guidance and about 14 percent of them were got the advance of funcs in planting trees. 3. About 22 percent of private owners wanted to cut the standing trees on their forest land. They are, therefore, due to the complexity of logging permission and low profitability, and about 74 percent of interviewees were dependent upon the fuel of forest products wholly.

몇 裸子植物의 花粉 分類學的 特性

安鉉哲,秋甲喆,趙顯瑞 진주산업대학교 1999 산업과학기술연구소보 Vol.- No.6

裸子植物 3種(소철, 은행, 나한송)에 대한 花粉을 光學顯微鏡 및 走査電子顯微鏡으로 花粉粒의 形態를 觀察하고 種의 記載와 檢索表를 작성하였다. 3樹種 모두 單粒이고 花粉립의 크기는 소철이 24.58±1.41X23.03±0.75㎛로 小粒이고, 은행나무 30.50±2.38X21.60±1.17㎛, 나한송 26.56±1.68X30.96±1.83㎛로 中粒이었다. 表面무늬는 소철이 流線狀이고 은행나무가 ??紋狀이며 나한송은 顆粒狀이다. 氣??은 나한송에만 있었으며 나머지 종은 갖고 있지 않았다. Pollen morphology of 3 species gymnosperm(Cycas revoluta, Ginkgo biloba, Podocarpus macrophyllus var. maki) was examined by light and scanning electron micropy. The palynological discription was made and keys to the species were provided. All pollens were monad in Cycas revoluta, G. biloba and P. macrophyllus var. maki, and their size were 24.58 ±1.41×23.03±0.75㎛, 30.50±2.38×21.60±1.17㎛ and 26.56=1.68×30.96±1.83㎛, respectively. From the observation by SEM, C. revoluta was striate, G. biloba was fossulate, P. macrophyllus var. maki was verrucate. Air bladder was observed only in P. macrophyllus var. maki.

數値地形모델을 利用한 林道路線 選定에 관한 硏究

安鉉哲,秋甲喆 진주산업대학교 농업기술연구소 1995 農業技術硏究所報 Vol.8 No.-

This study was aimed at suggesting a computer method to select forest road routes in mountainous forests using IDRISI based on digital terrain model. To examine the field applicability, the method was applied to selecting routes for the experimental forest of Chinju National University. The optimality conditions are evaluated in conjuction with longitudinal gradient, visual effect, cross effect of stream or the mixed criteria of these three.