도시철도시스템기술의 발전방향

한석윤,홍용기,Han, Seok-Yun,Hong, Yong-Gi 한국철도학회 2007 한국철도학회지 Vol.10 No.4

경량전철사업의 효과적인 수행을 위한 시스템엔지니어링프로세스 연구

한석윤,김주욱,백종현,Han, Seok-Youn,Kim, Joo-Uk,Baek, Jong-Hyun 대한기계학회 2013 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.1 No.1

경량전철시스템은 버스와 지하철의 중간정도의 수송능력을 가진 첨단 대중 교통수단으로 주로 무인으로 운전되며, 1개사업이 조단위의 건설비가 소요되는 대형 복합시스템이다. 이러한 경량전철사업을 효율적으로 수행하기 위해서는 시스템엔지니어링이 매우 중요하다. 시스템엔지니어링은 성공적인 시스템을 구현하기 위한 다분야 학문의 종합적 접근방법과 수단으로 복잡한 시스템을 개발 관리하기 위해 전체적(holistic), 생명주기적 관점에서 접근하며, 필요한 사항을 확인하고, 해야 할 일을 바르게 수행하도록 안내한다. 본 논문에서는 경량전철사업에서 시스템엔지니어링을 적용하기 위한 프로세스를 제시한다. 이를 위해 국내 경량전철사업의 시스템엔지니어링 특징을 분석하고, 국내에 적합한 시스템엔지니어링 프로세스와 프로세스의 산출물 작성을 위한 템플릿과 사례, 그리고 프로세스를 전산으로 구현한 사례를 제시한다. Light rail transit(LRT) is a public transportation and mainly has an automatic driverless operation system. LRT project is a large scaled project which a construction cost is tens of billions of won per km. Systems engineering(SE) is an interdisciplinary approach and means to enable realization of successful systems. In this paper, we propose the systems engineering processes and their outputs list for the LRT project. And then, we present template and sample case of process output. We also present a case which carried out SE process by SE tool.

동력 철도차량 기관실의 효과적인 환기에 관한 실험적 연구

한석윤,이진호,Han, S.Y.,Lee, J.H. 대한설비공학회 1990 설비공학 논문집 Vol.2 No.3

Experimental study was made to find the effective ways for cooling of engine room in a power car through natural ventilation, forced ventilation and wind tunnel test of 1:10 model. Through the measurements of inner temperature of engine room and pressure distribution of model surface for the various opening combinations and the fan locations, the following results are obtained. For natural ventilation, side and top opening combination is more effective than the side openings only and optimal opening combination is all side openings with top center opening. For forced ventilation with fan on the roof, the combination of all sides and top opening is more effective than the combination of side and top opening, and the optimal location of fan is top center. When the model is located in the air stream, the combination of side and top opening is more effective than the side openings only, and the optimal location of top opening is the front opening. With both air stream and forced ventilation, the optimal location of fan is the side region, and the direction of side grill installation is found to have negligible effect on the room ventilation.

경량전철사업의 시스템엔지니어링활동을 위한 상세일정계획 작성방법 연구

한석윤,김주욱,최요철,강도훈,Han, Seok Youn,Kim, Joo Uk,Choi, Yo Chul,Kang, Do Hoon 한국시스템엔지니어링학회 2012 시스템엔지니어링학술지 Vol.8 No.2

Suppliers in light rail transit project makes a systems engineering management plan(SEMP) as a top level plan which has a SEMS and SEDS as an control and monitoring means. In this paper, we analyze the international standards and some related documents, and present the directions to make the SEMS and SEDS which have WBS, accomplishments, schedule, events, person in charge. And then customize the project management tool and make SEMS and SEDS of LRT project as an example. The research results can be applied in LRT project after tailoring based on the project.

치과용 지르코니아 도재의 Li₂O 첨가에 따른 열팽창계수 변화

한석윤,Yoon, Han-Sok 대한치과기공학회 2009 대한치과기공학회지 Vol.31 No.4

Zirconia($ZrO_2$) has attracted much attention in science and technology because of its high refractive index, high melting temperature, hardness, low thermal conductivity and corrosion barrier properties. And it is widely used as the dental restoration material because of its esthetic appearance. In this research, we analyzed the particle size and composition of the imported dental porcelain for zirconia. And the glass frit was produced. To decrease the glass transition temperature and softening temperature of the glass frit, $Li_2O$ was added into it and the effect of $Li_2O$ on the firing temperature was researched. Then the glass which contains leucite crystal with a high coefficient of thermal expansion(CTE) was manufactured and it was mixed with the glass frit to control the CTE. The phase composition were analyzed using the X-ray diffraction. The morphologies of the samples were observed by the scanning electron microscope. The 4wt% $Li_2O$-added glass frit has the optimal glass transition temperature and softening temperature. And 6 wt% leucite crystal was mixed with the glass frit to control the CTE. From the experimental results of crystallization, the crystal phase was found only leucite crystal.

고무차륜 AGT 차량시스템의 신뢰성관리체계 개발

한석윤,김종걸,홍순기,하천수,Han Seok Youn,Kim Jong Gurl,Hong Soon Ki,Ha Chen Soo 대한안전경영과학회 2004 대한안전경영과학회지 Vol.6 No.4

Korea Railroad Research Institute(KRRI) has developed the rubber-tired AGT system from 1999 to 2004. The rubber-tired AGT vehicle is now on test for its performance and function in the Gyeong-San test line. In this paper, we provide the reliability management plan to assure required the RAMS(reliability, availability, maintainability 8t safety) of the AGT vehicle system.

치과교정학분야의 3차원 CAD/CAM System 기술 활용

한석윤,Han, Seok-Yun 대한치과기공학회 2009 대한치과기공학회지 Vol.31 No.4

대구.경북지역 노인의 의치장착실태 및 관련 요인

한석윤,이화식,이종도,Han, Sok-Yoon,Lee, Hwa-Sik,Lee, Jong-Do 대한치과기공학회 2010 대한치과기공학회지 Vol.32 No.4

Purpose: This study was conducted to investigate the wearing dentures status of the elderly and understand the relationship between demographic sociological properties, oral health care habits, lifestyle, and whether they wears dentures or not. Methods: In a surveying of 349 elderly who lives in Daegu and Kyung-pook, following results are obtained. Results: Wearing dentures rates of the aged are 58.5%. The more the aged is female(p=0.025), elderly(p=0.000), a low education level(p=0.000), no job(p=0.006), and a solitary person(p=0.016) the higher rate they wears dentures. The more the aged brushes their teeth after each meal(p=0.029) and uses the oral health devices(p=0.000) the lower rate they wears dentures. The more the aged have dinner alone(p=0.009), do not kept up with the exercises (p=0.000), and would like to dine off a soft food(p=0.000) the higher rate they wears dentures. Conclusion: This study showed that an old people's condition of oral health care who live in Daegu Kyungpook is very serious. Therefor not only an elderly but other aged people is need of constant and organized education for taking their oral health care habits and changing their lifestyle. Because wearing dentures rates of the aged by demographic sociological properties, oral health care habits, and lifestyle is lower.

Sol-Gel 성형체에 의해 다르게 표면 처리된 치과 Implant용 Ti-6Al-4V합금의 Hydroxyapatite 코팅에 관한 연구

한석윤,Han, Sok-Yoon 대한치과기공학회 2004 대한치과기공학회지 Vol.26 No.1

In the present study, a simple method was successfully used for hydroxyapatite coatings on Ti-6Al-4V substrates deposited by using a sol-gel derived precursor. Prior to hydroxyapatite coating the samples were micropolished (0.1 micron) and divided into three sets. The first set,were the micropolished samples kept as such. The second set were coated with titania sol and the third set was treated with 5M NaOH. After three repetitions of hydroxyapatite coating procedures on each set and heat treatment at 600 $^{\circ}\Delta C$, the formation of hydroxyapatite has been confirmed by XRD analyses and the substrate material was found to be oxidized with negligible amount of CaO in the coating. The SEM studies revealed surface morphology. Hydroxyapatite, calcined at 600$^{\circ}\Delta C$, displaying a porous structure arisen from heating of the bulk. But, it is very meaningful in trying to approach morale management plans with an object of dental technicians. It is necessary that dental technicians should make efforts to control themselves.

노인들의 의치 장착 기간과 의치 사후 관리에 영향을 주는 요인 - 경북 농촌지역을 중심으로 -

한석윤,배봉진,이화식,Han, Sok-Yoon,Bae, Bong-Jin,Lee, Hwa-Sik 대한치과기공학회 2012 대한치과기공학회지 Vol.34 No.4

Purpose: In order to validate empirically the theoretical model of this study subjects, who were limited in Andong gun, Youngyang gun, Uiseong gun, Bonghwa gun, Chilgok gun, Cheongsong gun according to residence-specified distribution and over aged 65, were focused to the elderly in rural areas with geographical characteristics where they have difficulties in accessibility of dental facilities and dental care. Methods: The collected data were analyzed by the SPSS 19.0 program. First, the frequency analysis was performed for each independent variable and the dependent variable. Second, reliability analysis and correlation analysis were conducted for daily living skills and Biomedical Vigilance. Third, multivariate analysis was performed in terms of and the post-administration management. Fourth, multiple regression analysis was performed to identify the factors affecting the post-management of dentures and the period of using dentures. Results: By results of the multiple regression analysis, the elder the subjects are(${\beta}$ = 0.03), the lower their income activities are(${\beta}$ = -0.18), the smaller their monthly allowances are(${\beta}$ = -0.16), the worse their daily activity skills are(${\beta}$ = -0.12), the more they were mounted their dentures by an unlicensed contractor(${\beta}$ = 0.07), and the more they cost to their dentures(${\beta}$ = 0.14), the longer the period of use dentures are. And the beneficiaries of Basic Livelihood Security(${\beta}$ = -0.14) who got free denture business are shorten the period of using dentures. According to multiple regression analysis for post management of dentures, the independent variables like the health education(${\beta}$ = 0.24), smoking(${\beta}$ = -0.18), periodic oral examination(${\beta}$ = 0.13), dentures mounted by an unlicensed contractor(${\beta}$ = -0.13) are shown statistically significant results. In that study subjects are taking part in health education and non-smokers, they are likely to have more chances to post management for their dentures like periodic oral examination. However the subjects who were weared their denture by an unlicensed contractor get less chance to post management for their dentures. Conclusion: As the elderly who want to wear denture are increasing due to the denture insurance for the elderly, the need for oral health education for the elderly is an urgent request, especially continuos education for the way of use their dentures and follow-up management for the elderly who were already mounted their dentures. And also, the need for more systematic researches is requested for securing objective data.