• 한국산학기술학회논문지
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• 제19권1호
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• pp.25-33
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• 2018

화석 연료의 고갈과 온난화 현상으로 인해 새로운 에너지원에 대한 관심이 급증하고 있다. 그 중에서 바이오가스는 유기성 폐기물 및 바이오매스를 혐기성 소화과정인 가수분해(hydrolysis), 산발효(acidogenesis), 유기산발효(acetogenesis), 메탄발효(methanogenesis)의 단계를 거쳐 발생되기 때문에 친환경적인 에너지자원으로 각광받고 있다. 그러나 바이오가스는 기존의 정제설비로는 제거할 수 없는 높은 미세분진 및 수분 함량으로 인해, 직접연소, 도시가스, 자동차용 연료 등 효율적인 이용을 위해서 정제시스템이 필요하다. 따라서 본 연구는 미세분진과 수분을 동시에 제거할 수 있는 정제과정의 전처리 방법으로써 원심력을 이용하는 냉각공정을 설계하였다. 원심력을 이용하여 분진을 제거하는 Cyclone 내 외부에 열교환기와 ID fan을 구성하여 주입되는 가스를 어는점 이하로 냉각시킴으로써 물안개를 형성시켜 분진입자를 제거하고, 일부 가스를 ID fan을 이용하여 재순환시켜 제거하는 고효율 냉각제어공정을 개발하였다. 수분제거는 유량(25~150L/min) 및 상대습도(60~95%)의 조건에서 시험하였다. 수분제거율은 상대습도 $95{\pm}5%$일 때 평균 80.8%, 입자제거율은 입자크기 $2.5{\mu}m$에서 평균 99.78%의 제거효율을 보였고, 수분과 입자의 동시제거효율은 수분 70.86%, 입자 99.67%의 평균값을 보여주었다.

• 산경연구논집
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• 제11권7호
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• pp.29-40
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• 2020

Purpose: In modern society, many urban problems are occurring, such as aging, hollowing out old city centers and polarization within cities. In this study, we intend to apply big data and machine learning methodologies to predict depression symptoms in the elderly population early on, thus contributing to solving the problem of elderly depression. Research design, data and methodology: Machine learning techniques used random forest and analyzed the correlation between CES-D10 and other variables, which are widely used worldwide, to estimate important variables. Dependent variables were set up as two variables that distinguish normal/depression from moderate/severe depression, and a total of 106 independent variables were included, including subjective health conditions, cognitive abilities, and daily life quality surveys, as well as the objective characteristics of the elderly as well as the subjective health, health, employment, household background, income, consumption, assets, subjective expectations, and quality of life surveys. Results: Studies have shown that satisfaction with residential areas and quality of life and cognitive ability scores have important effects in classifying elderly depression, satisfaction with living quality and economic conditions, and number of outpatient care in living areas and clinics have been important variables. In addition, the results of a random forest performance evaluation, the accuracy of classification model that classify whether elderly depression or not was 86.3%, the sensitivity 79.5%, and the specificity 93.3%. And the accuracy of classification model the degree of elderly depression was 86.1%, sensitivity 93.9% and specificity 74.7%. Conclusions: In this study, the important variables of the estimated predictive model were identified using the random forest technique and the study was conducted with a focus on the predictive performance itself. Although there are limitations in research, such as the lack of clear criteria for the classification of depression levels and the failure to reflect variables other than KLoSA data, it is expected that if additional variables are secured in the future and high-performance predictive models are estimated and utilized through various machine learning techniques, it will be able to consider ways to improve the quality of life of senior citizens through early detection of depression and thus help them make public policy decisions.

• 한국산학기술학회논문지
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• 제17권12호
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• pp.504-510
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• 2016

본 연구는 현재 정보통신기술 시대에 요구하는 문제해결 능력을 갖춘 몽골의 인재를 양성하기 위하여 효율적으로 학습할 수 있도록 하기 위한 방안으로 몽골 공학대학에서 적합한 Blended PBL 모형을 제시한다. BPBL은 학습자 중심의 교육 방법이다. 현재 몽골에서 빠르게 변화하는 교육환경과 학생의 요구에 부응하기 위해 공학 교수법의 변화가 필요하다. 따라서 몽골 공학 교육의 발전을 위한 BPBL 학습을 도입하며 공학 교수자들에게 더 많은 교육의 기능성을 제공 할 것이다. 최근에는 몽골에서 대학 내에 '교수학습센터'를 설립하여 '가르치는 방법'에 대한 교육과 지원을 교수자들에게 제공하고 있지만, 아직도 단편적이고 일회적인 특강 형식의 지원이 대부분이다. 이런 이유로 많은 교수들은 '그저 자신이 배운 방식대로' 가르친다. 아직도 공학 교수방법은 교수자 중심으로 이루어지고 있다. 앞으로 급변하는 미래 정보사회를 전망할 때, 몽골공과대학의 목표해야 할 기본적인 방향은, 규제의 철폐, 완화를 통해서 진정으로 풍요롭고 활력 있는 사회를 형성하고 있으며 최근의 공과대학 강사와 사회는 익숙한 구식 방법 말고 다른 공학 교육 방법을 요구하고 있다. 새로운 공학 교육 방법의 개발에 효과적인 엔지니어링 전략을 사용하는 것은 성공으로 이어질 것입니다.

• 한국산학기술학회논문지
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• 제17권12호
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• pp.518-531
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• 2016

본 연구는 현대교회 건축 디자인에 많은 영향을 끼친 도미니크 수도회 신부 마리 알랭 쿠튀리에(Marie Alain Couturie)가 주창한 성미술(L'Art Sacre) 운동의 추진과정과 건축적 특성을 고찰하는데 목적이 있다. 이를 위해 성미술 운동의 전개과정을 분석한 후, 이를 토대로 성미술 운동 속에 내재해 있는 건축적 담론, 특히 쿠튀리에가 주창한 건축개념의 특성이 무엇인가를 분석하고자 하였다. 1차적으로 1936년부터 1954년 사이에 성미술 운동의 기관지 라르 사크레지에 기고 된 쿠튀리에의 글 속에 나타난 언설을 분석하고, 2차적으로 성미술 건축 프로젝트의 현지답사를 통해 성미술 운동의 실체를 파악하였다. 성미술 운동의 대표적인 건축물인 아시성당과 로사리오성당, 롱샹교회, 라투렛수도원, 로스코채플 등 5개의 프로젝트를 분석대상으로 하였다. 본 연구의 결과 쿠튀리에의 건축개념의 특성은 '시적'(Poetic) 분위기의 창출에 기초하고 있음을 파악할 수 있었으며, 재료의 즉물성과 순수함은 모더니즘기의 추상적 사유와 연결되어 있음을 규명할 수 있었다. 쿠튀리에 신부는 르 코르뷔지에를 성미술 운동을 구현할 수 있는 가장 적합한 건축가로 인식하였으며, 이러한 사유는 롱샹 성당과 라투렛 수도원을 탄생시키는 직접적 동인이 되었음을 파악할 수 있었다. 본 연구에서는 20세기 중반 교회건축의 혁신을 일으켰던 성미술 운동의 전개과정과 쿠튀리에 신부가 펼친 건축개념의 분석을 통해 현대교회건축의 공간이미지 구성과 디자인에 지침과 교훈이 될 것으로 사료된다.

• 시큐리티연구
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• 제59호
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• pp.217-242
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• 2019

최근 발생하는 테러는 대량살상을 목적으로 한 무차별적 공격 양상을 보이고 있어 불특정 다수에게 피해를 줄 수 있는 화생방테러의 위협은 현대사회의 가장 큰 위협요소라고 볼 수 있다. 이에 대비하여 국가차원에서도 2016년 테러방지법을 제정하여 경찰주도의 화생방테러 대응체계를 구축하였다. 이때, 환경부·질병관리본부·원자력안전위원회 등의 관계기관은 경찰을 지원하는데, 외국의 유사사례 분석결과 신속한 화생방테러 사건대응을 위해서는 다부처 간 상설 정보공유 및 협력체계 강화가 핵심으로 분석되었다. 이를 구축하기 위해 본고에서는 경찰청·대테러센터·화생방 전문기관·군·소방·국정원 등 대테러 기능의 화생방테러 공동대응(지역)협의체 구성 및 운영방안을 제시하였으며, 협의체 구성의 기대효과를 분석하였다. 협의체 구성을 통해 기관별 협력체계 및 현장대응력을 제고 할 수 있고 대테러 업무효율 향상(25~39%)이 가능하며, 현대사회의 비정형화된 화생방 테러사건에 효과적으로 대응 가능한 대테러 전담조직을 갖출 수 있다.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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• pp.235-243
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• 2002

Ni-base superalloys are used extensively in industry, both in aeroengines and land based turbines. About 60% by weight of most modern gas turbine engine structural components are made of Ni-base superalloys. To satisfy practical demands, the efficiency of gas turbine engines has been steadily and systematically increased by design modifications to handle higher turbine inlet or firing temperatures. However, the increase in operating temperatures has lead to a decrease in the life of components and increase in costs of replacement. Moreover, around 80% of the large frame size industrial/utility gas turbines operating in the world today were installed in the mid-sixties to early seventies and are now 25 to 30 years old. Consequently, there are greater opportunities now to repair and refurbish the older models. Basically, there are two major factors influencing the weldability of the cast alloys: strain-age cracking and liquation cracking. Susceptibility to strain-age cracking is due to the total Ti plus AI content of the alloy; Liquation cracking is due either to the presence of low melting constituents or constitutional liquation of constituents. Though Rene 41 superalloy has 4.5wt.% total Ti and Al content and falls just below the safe limit proposed by Prager et al., controlled grain size and special heat treatments are needed to obtain crack-free welds. Varying heat treatments and filler materials were used in a laboratory study, then the actual welding of service parts was carried out to verity the possibility of crack-tree weld of components fabricated from Rene 41 superalloy. The microstructural observations indicated that there were two kinds of carbides in the FCC matrix. MC carbides were located along the grain boundaries, while M$_{23}$C$_{6}$ carbide was located both inter and intra granularly. Two kinds of filler materials, Rene 41 and Hastelloy X were used to gas tungsten arc weld a patch into the sheet metal, along with varying pre-weld heat treatments. The microstructure, hardness and tensile tests were determined. The service distressed parts were categorized into three classes: with large cracks, with medium cracks and with small or no visible cracks. No significant difference in microstructure among the specimens was observed. Specimens were cut from the corner and the straight edge of the patch repair, away from the corner. The only cracks present were found to be associated with inadequate surface preparation to remove oxidation. Guidelines for oxide removal and the welding procedures developed in the research enabled crack-free welds to be produced.d.

• 한국건설관리학회논문집
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• 제13권2호
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• pp.58-69
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• 2012

현대사회는 대도시의 구조물 설계 시 협소한 공간제약을 극복하기 위해 옥상 및 지하공간을 활용하고 있으며, 이에 따라 바닥재의 시공도 증가하고 있다. 바닥재의 미끄럼저항성능은 보행자 및 운전자의 안전성 및 쾌적성 관점에서 대단히 중요한 성능임에도 불구하고, 바닥재의 미끄럼저항성능에 대한 뚜렷한 기준이 없어 개선이 되고 있지 않은 실정이다. 본 논문에서는 국토해양부의 도로안전시설 설치 및 관리지침과 서울시의 서울형 보도포장 미끄럼 저항 기준에 기초하여 미끄럼저항성능의 평가방안을 제시하였다. 세 가지의 우레탄 바닥재 시공법을 선정하여 실험적인 연구를 통해 각 바닥재의 미끄럼저항성능을 분석하고, 제시된 평가 방안에 따라 평가하였으며, VE분석을 통해 세 가지 바닥재 시공법의 성능을 종합적으로 평가함으로써 미끄럼저항성능이 우수한 바닥재가 시공될 수 있도록 독려하였다. 본 논문에서 제시된 평가방법에 따른 VE분석 결과, 미끄럼저항성능이 최대 4배 이상 향상되었던 파티클재료를 첨가한 공법이 83.86의 성능지수를 보임으로써 기타 비교안에 비해 가장 우수한 성능을 나타내었다.

• 복식
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• 제6권
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• pp.65-87
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• 1982

1. Purpose: The purpose is to apply and adapt ancient textile pattern to practical life, and to contribute to the promotion of the creative development of modernization and Koreanization of textile pattern by the survey of the extent of taste for the textile pattern existent in Korean costume among costumes. 2. Hypothesis: Textile pattern is in most classical one expressed in fact, but nowadays abstract or geometric one is more exist. Consumers are in most part in forties, and so the taste cannot be ignored. Therefore aesthetic consciousness found Korean costume is more important rather than excessively bold or mordern one. 3. Method and Process: (1) This research is analysed 386 one through college student and parents of a primary or high school. (2) Taste of the pattern is comparisoned and analyzed as age. education, pocket money of the student or an income of a month in home through computer. And the analysis of the statistics research is operation through the Chi-Square Goodness of-Fit-Test. 4. Conclusion: (1) The Korean costume put on mostly party or formal dress, therefore it should be researched as an outdoor dress with traditional costume. (2) The most one is concerned in textile pattern, it's taste is different from color, constitution. Textile industry is developed not only weave pattern, gold-coverning pattern but embroidry pattern, dye pattern, therefore the various side of pattern design should be researched. (3) In Side of form, plant pattern is not only most various but highest in popularity. According to approach nowadays, all of the pattern becomes composition or geometric one with abstract tendency and so from these day pattern is necessary combinationed, researched with our people emotion. (4) The color of textile pattern is choiced individual taste. Through investige, research in various side of the modern taste and our costume, we take growing interest in the color, composition of textile, and should dressed with beauty and grace. (5) In side of size, textile pattern is choiced to individual face and body shape through research on form, color, size of these pattern, we should endeavor to dress well. (6) In side of application, most people is concerned in not only interior ornament but the costume is high. Costume research by some people of the outside and symbol with interior through the pattern analysis is not only very important but also is due to people culture.

• 복식
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• 제64권3호
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• pp.108-125
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• 2014

The purpose of this study is to provide the basic information necessary to develop sports uniform design by comparing and analyzing the color features and images of professional football uniforms in Korea and foreign countries. The subjects of this study were limited to 5 top leagues in Europe (Premier League, Primera Liga, Bundesliga, Serie A, and Ligue 1) as well as J-League, and K-League. This study was done using the 2012/2013 season home and away uniforms for European leagues and 2013 season home and away uniforms for Korean and Japan leagues. Using the Adobe photoshop CS2 eyedropper tool, color chips and RGB values were extracted from digital images and converted into HV/C of Munsell Conversion. Finally, a total of 735 colors were used for the analysis. The color image scale by Shigenobu Kobayashi was used to position the color images. The results are as follows. First, the color analysis of professional football uniforms in leagues suggested that chromatic color (53.7%) was more prevalent than achromatic color (46.3%). The two most common colors of the ten chromatic colors were R(19.7%) and PB(18.0%), followed by Y(5.4%), RP(2.0%), G(1.9), GY(1.8%), B(1.6%), YR(1.5%), P(1.1%), and BG(0.7%). Second, for the color tone comparison and analysis of professional football uniforms in leagues, the most commonly used color tone was W(28.4%), followed by v(25.5%), Bk(16.3%), s(5.8%), dk(5.2%), b/lt(5.2%), dp(3.0%), sf(2.0%), ltGy(1.0%), p(0.5%), G/dkGy(0.4%), and ltg/mGy (0.1%). Third, for the comparison and analysis of color and color tone of professional football uniforms in leagues, W(28.4%), R(v)(17.7%), and Bk(16.3%) were commonly used. Finally, for the comparison and analysis of color images of professional football uniforms in leagues, the most commonly used color image was a casual image(31.8%), followed by modern image(26.5%), dynamic12.8%), cool casual(12.0%), gorgeous(9.3%), clear(6.6%), chic(3.5%), and elegant images. Dandy, classical, romantic and pretty images(0.4% respectively) were also used.

• 대한예방한의학회지
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• 제15권3호
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• pp.67-81
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• 2011

Background : Complementary and alternative medicine has bee used to cardiovascular diseases. In recent years, many hospitals have tried to integrate complementary and alternative medicine(CAM) with conventional medical approaches for patients with chronic diseases. Recently, the prevalence of the use of traditional Korean medicine(TKM) among patients with chronic diseases, expecially, hemiplegia patients after cerebrovascular accident is increasing in Korea. To date, however, there were only few studies addressing the patients' attitudes, and utilization of TKM, compared to the well-documented escalating use of TKM among consumers in Korea. Objectives : The objective of this study was to analyze the prevalence of TKM use among hemiplegia patients after cerebrovascular accident and to determine what factors affect to use CAM among the patients. The study also aims to provide information on TKM and assist therapy selection among various CAM therapies for hemiplegia patients after cerebrovascular accident within health care system in which both practitioners of TKM and practitioners of modern Western medicine coexisted. Methods : The design of the study was descriptive cross-sectional, and data were collected using a 32-items questionnaire. The subjects were one hundred fifty nine patients with chronic diseases who visited or admitted to health care facilities in a hospital in Seoul Metropolitan city, Korea. Data were analyzed using 'SPSS Statistics 18.0 Network Version(on release 18.0.1 of PASW Statistics)' program. Various statistical methods were used to obtain a profile for participants and the therapies most frequently used by hemiplegia patients of TKM. Logistic regression analysis was employed in order to determine the predicting variables of TKM use. Results : The prevalence of the use of TKM was 51.6%. The most common TKM therapies used by the patients included acupuncture(93.2%), herbal medicine(64.8%), and cupping(37.5%). Results of logistic regression analysis revealed that the variables significantly related with TKM use were gender, marital status, job, No. of visiting health care facilities/week. Conclusions : This study shows that the use of TKM among the hemiplegia patients is relatively high in Korea, this topic should be taken into account in the development of a holistic approach for patients with chronic diseases and an efficient chronic disease management system in Korea.