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      • KCI등재

        산질화 표면에서의 액적 증발 열전달 성능 분석

        김대윤,이성혁 한국분무공학회 2019 한국액체미립화학회지 Vol.24 No.4

        In general, the oxi-nitriding method is well known as such a surface treatment way for substantial enhancement in corrosion resistance, even comparable to that of titanium. However, there are still lacks of information on thermal performance of the oxi-nitriding surface being of additional compound layers on the base substrate. Above all, the quantitative measurement of its thermal performance still was not evaluated yet. Thus, the present study experimentally measures the thermal resistance of the oxi-nitriding surface during droplet evaporation and then estimates heat transfer performance with the use of the onedimensional heat transfer model in vertical direction. From the experimental results, it is found that the total evaporation time slightly increased with the thermal resistance caused by the oxi-nitriding layer, showing a maximum difference of approximately 20% with that of the bare surface. Although the heat transfer performance of oxi-nitriding surface became slightly lower than that of the bare surface, the oxi-nitriding surface exhibits much better heat transfer performance compared to titanium.

      • 영상전화기(비디오폰) 판매 활성화방안 연구 - 서울시를 중심으로 -

        김대윤,이상윤 한국유통과학회 2009 유통과학연구 Vol.7 No.1

        Sees the market where home appliance and network equipment, the communication service enterprises are new recently the home network market of the most which has an interest in the home network is being activated the newly-built high-class apartment in the center. The company building leads because not being option of the case last customer of newly-built market and must do a business ․ marketing. So newly-built market the demand grasp which is individual leads sale activation with difficult and that to creates a benefit there is a limit judges and axis market in the object hereafter demand at even the popular house the function to prepare in being magnified is simple and there is a possibility of saying that a more effort is demanded in supply style video phone market opening up where the price is cheap. Saw with like this reason from, analyzes the concept and a market trend of the video phone, grasps distribution channel forms and A/S handling systems and there is the goal finds the video phone sale revitalization plan which is suitable in all market.

      • KCI등재

        한국안광학회지 게재 논문의 주제어와 MeSH 용어의 비교·분석

        김대윤,이민형,최문성 한국안광학회 2016 한국안광학회지 Vol.21 No.2

        목적: 한국안광학회지에 게재된 논문을 대상으로 영문 주제어(key word)와 의학용어 주제어집(MeSH-Medical Subject Headings) 용어와의 일치도를 비교 분석하여 한국안광학회지에서의 MeSH 용어의 이해도와 활용도를 높이고자 하였다. 방법: 2004년 9권 1호부터 2016년에 21권 1호까지 최근 12년 간 총 409편의 영문 주제어 1952개를대상으로 MeSH 용어와의 일치도를 완전일치, 부분일치, 불일치로 분석하였다. 결과: 분석 결과 완전일치를 보인 주제어 수는 439개로 전체의 22.4%이고, 부분 일치한 용어의 수는 815개이며 전체의 41.8%를 차지하였다. 완전불일치한 주제어는 총 693개가 나왔으며 이는 전체의 35.5%에 해당되었다. MeSH 용어 중 가장 높은 빈도수를 보인 주제어는 Myopia, Astigmatism과 visual acuity 순서였으며, MeSH 용어와 부분일치를 보인 논문 주제어 중 Refractive error, Soft contact lens, Phoria 순서로 높은 빈도수를 나타내었다. MeSH 용어와 비교 시 불일치되는 주제어 중에서 빈도가 상위인 것은 Accommodative lag와 Pseudomonas aeruginosa 였다. 결론: 한국안광학회지가 유명MEDLINE에서 검색되는 논문 활용성을 제고하기 위하여 영문 주제어를 선택할 때 MeSH 용어로 선택 될 수 있도록 해야 한다. Purpose: The purpose of this study is to compare and analyze keywords of articles in the Korean Ophthalmic Optics Society to MeSH (Medical Subject Headings) terms. The study hopes to enhance the understanding and usage of MeSH and give fundamental information to the Korean Ophthalmic Optics Society in advance. Methods: A total of 1952 keywords from 409 informative articles published from 2004, Vol 9(1) to 2016, Vol 21(1) were compared with MeSH terms according to the criteria of complete coincidence, incomplete coincidence and complete incoincidence. Results: 439 keywords (22.4%) were completely coincident with MeSH terms, 815 keywords (41.8%) were incompletely coincident with MeSH terms and 693 keywords (35.5%) were completely incoincident with MeSH terms. The most used keyword in MeSH terms is in the order of Myopia, Astigmatism and visual acuity. For the incompletely coincident keywords Refractive error, Soft contact lens, and Phoria were used the most. Finally, the most used keywords in the category of completely incoincident were Accommodative lag and Pseudomonas aeruginosa. Conclusions: It is highly recommended that MeSH terms are selected as controlled keywords to increase usage of searced Korean Ophthalmic Optics Society articles in MEDLINE.

      • KCI등재

        사상체질(四象體質)의 유전성(遺傳性) 검토(檢討)에 대한 통계적(統計的) 연구(硏究)

        김대윤,이재원,김달래,Kim, Dae-yun,Lee, Jae-won,Kim, Dal-rai 사상체질의학회 1999 사상체질의학회지 Vol.11 No.1

        Purpose : Sasang Constitutional Medicine explains the pathology peculiar to constitution and suggests treatment for each constitution. In Sasang Constitutional Medicine hwnan beings are classified on four groups; Taeyangin, Taeumin, 5oyangin, Soeumin. These four constitution has their's own symptoms and treatments. In treatment, control of mind inclination, that is to say, moderation takes a very important role. But the study on heredity in Sasang Constitutional Medicine has not done not biological study but also statistical study. So we used several statistical methods and analyzed 163 samples. Methods : We implemented Fishers exact test for adjusting chi-squared test, kappa coefficient to estimate agreement of parent's and children's constitutions, and finally plotted bi-plot using correspondence analysis. Results : From Fisher's exact test result, we could know that parent's and children'S constitution's distribution had significant difference. In kappa coefficient, mother and daughter's estimated value produced highest result. In correspondence analysis we only plotted the case of mother and son for easy interpretation. Conclusion : In the study of heredity of SaSang constitution, we cannot know exactly the heredity of constitution in terms of biology or genetics. But this research can be helpful for further analysis, that is, a study of biological or genetical aspects. And we could conclude that in statistical aspects the heredity in SaSang constitution is meaningful.

      • 이용자 관점에서 복합상업시설 활성화 요인의 중요도 분석

        김대윤,박재홍 한국도시부동산학회(구 도시정책학회) 2016 도시정책학회 학술대회 Vol.2016 No.3

        복합상업시설은 다양한 계층이 이용하는 상업시설로 장기운영을 통하여 수익을 내 는 시설로 분양사업과 달리 장기적으로 운영하려면 이용자들의 좋아하는 활성화 요 인의 중요도를 정확히 분석해야 할 것이다. 이러한 관점에서 본 연구는 복합상업시설 을 이용하는 다양한 사람들이 중요시하는 활성화 요인을 조사하여 개발운영에 필요 한 기초자료로 제공하고자 한다. 활성화 요인의 중요도는 기존이 상업시설과 관련된 선행연구들의 조사를 위하여 AHP 설문지를 구성하였으며, 전문가 집단을 대상으로 설문을 실시하였다. 특히 건축적인 요소까지 포함하여 물리적인 편안함이 이용자들에게 얼마나 중요한 영향을 주고 있는 지 분석하였다. 연구결과 복합상업시설 활성화를 위한 테넌트의 중요도 요인이 엔터테 인먼트, 판매, 동선, 물리적 환경 순으로 분석되었다. 복합상업시설의 성공은 테넌트의 역할이 중요한 것으로 판단된다.

      • KCI등재

        공공임대주택 공유공간의 커뮤니티 현황 분석 - 서울특별시 공공임대주택을 중심으로 -

        김대윤,주범 한국문화공간건축학회 2021 한국문화공간건축학회논문집 Vol.- No.74

        In recent years, the domestic society has diversified its household structure due to the increase in single-person households and changes in values. Accordingly, the government sought to secure the stability of national housing by distributing various types of public housing. However, if you look at the status of public housing, under the idea of securing housing stability for the vulnerable and homeless, a uniform shared space plan is being implemented that prioritizes quantitative distribution over qualitative aspects and does not reflect the characteristics of residents. A shared space may perform functions of exchange and harmony among residents, spatial connection with local communities, and programmatic connection. In other words, a shared space can be interpreted as an important space to improve the quality of public housing. Therefore, this paper selected five apartments completed in Seoul since 2010 and analyzed the current status of shared spaces in terms of social, convenient, variable and active functions. Afterwards, based on the analyzed results, it presents the direction of future development of shared spaces in public housing after collecting and organizing excellent parts.

      • KCI등재

        산질화 표면에서 액적의 증발열전달 특성

        김대윤,이성혁 한국분무공학회 2016 한국액체미립화학회지 Vol.21 No.1

        The present study aims to experimentally investigate the evaporative heat transfer characteristics of Oxi-nitriding SPCC surface. Moreover, the heat transfer coefficient was examined with respect to surface temperature during droplet evaporation. In fact, the nitriding surface showed significant enhancement for anticorrosion performance compared to bare SPCC surface but the thermal resistance also increased due to the formation of compound layer. From the experimental results, the evaporative behavior of sessile droplet on nitriding surface showed similar tendency with the bare surface. Total evaporation time of sessile droplet on the nitriding surface was delayed less than 5%. The difference in heat transfer coefficient increased with the surface temperature, and the maximum difference was estimated to be around 11% at 80oC surface. Thus, this nitriding surface treatment method could be useful for seawater heat exchanger industries.

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