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다이아몬드 공구의 회전원판내 응력 분산을 위한 슬롯 위치의 최적화
박성일,이상진,변서봉,황성택,Park Sungil,Lee Sangjin,Byun Seopong,Hwang Seoungtack 한국재료학회 2005 한국재료학회지 Vol.15 No.9
The objective of this paper is to decide optimal of the slot angle to minimize stress concentration in rotating disc of diamond saw. The fracture phenomena of the slot are discussed by the theoretical and experimental approaches and then some recommendation are presented to prevent the fracture. The focus of this investigation is to evaluation the effect of the slot on stress distribution using optimum design technique and finite element method(FEM) analysis. Stress concentration of the slot with respect to the various parameter of the slot such position, size, number, rotation speed. From the experimental results, when the slot angle of diamond saw is located $8^{\circ}\~12^{\circ}$ from rotating direction, the maximum equivalent stress reduces.
박성일(Sungil Park),배성연(Sungyeon Bea),임예광(Yekwang Lim),임소윤(Soyun Lim),민인아(Ihnah Min),김상진(Sangjin Kim) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.6
물물 교환은 가치있는 물건을 얻을 수 있는 유용한 활동이다. 하지만 물물교환을 하기에는 물물교환을 위한 상품 수가 적고 교환에 긴시간이 소요된다. 그리고 물물교환에 신뢰를 갖지 못한다는 문제점이 있다. 이 점을 해결하기 위해 물물교환 전용 서비스를 구축하고 빠른 시간에 상품 조회 및 물물교환을 진행 시킬 수 있는 스와이핑 UI를 채택하고 보증금을 이용한 신뢰높은 물물교환 서비스를 제안한다. Bartering is a useful activity that allows you to obtain valuable items. However, for barter exchange, the number of goods for barter exchange is small and the exchange takes a long time. And there is a problem that there is no trust in barter exchange. To solve this problem, we build a barter-exchange-only service, adopt a swiping UI that allows quick product inquiry and barter exchange, and propose a reliable barter exchange service with a deposit.
System Dynamics를 활용한 인천항 철재화물 물동량 예측에 관한 연구
박성일(Sungil Park),정현재(Hyunjae Jung),전준우(Junwoo Jeon),여기태(Gitae Yeo) 한국항만경제학회 2012 韓國港灣經濟學會誌 Vol.28 No.2
제조산업의 핵심 원자재인 철재화물은 항만의 처리 물동량 증대를 위한 주요화물로 자리잡고 있다. 특히 인천항의 경우 철재화물 처리실적이 타 화물에 비해 비중이 높아 항만 활성화를 위한 주요 화물이라 할 수 있다. 이러한 측면에서 인천항을 운영하는 인천항만공사는 인천항 북항지역에 철재화물과 같은 주요 벌크화물을 처리할 수 있는 전용선석 및 배후지를 북항지역에 개발하여 운영하고 있다. 하지만 실제 처리물동량이 개발 당시 예측되었던 물동량에 비해 저조한 실적을 보이면서 운영상 어려움에 직면해있다. 이러한 결과는 국내외 다양한 경제지표를 반영한 벌크화물의 수요예측이 이루어지지 못한 결과로 판단된다. 따라서 본 연구에서는 시스템 다이내믹스 기법을 이용하여 국내 철재화물 관련 산업 경기 및 세계 경제상황을 고려한 인천항 철재화물 예측을 시도하였다. 그 결과 인천항에서 처리되는 철재화물 물동량은 2011년 약 8백만 톤을 시작으로 2020년 약 1천만 톤이 처리될 것이라 예측되었다. 예측치의 정확도를 검증하기 위해 절대평균오차비율을 적용한 결과 0.0013으로 정확도가 매우 높은 것으로 나타났다. The steel cargoes as the core raw materials for the manufacturing industry have important roles for increasing the handling volume of the port. In particular, steel cargoes are fundamental to vitalize Port of Incheon because they have recognized as the primary key cargo items among the bulk cargoes. In this respect, the IPA(Incheon Port Authority) ambitiously developed the port complex facilities including dedicated terminals and its hinterland in northern part of Incheon. However, these complex area has suffered from low cargo handling records and has faced operational difficulties due to decreased net profits. In general, the import and export steel cargo volumes are sensitively fluctuated followed by internal and external economy index. There is a scant of research for forecasting the steel cargo volume in Incheon port which used in various economy index. To fill the research gap, the aim of this research is to predict the steel cargoes of Port of Incheon using the well established methodology i.e. System Dynamics. As a result, steel cargoes volume dealt with in Incheon port is forecasted from about 8 million tons to about 10 million tons during simulation duration (2011-2020). The Mean Absolute Percentage Error (MAPE) is measured as 0.0013 which verifies the model"s accuracy.
접착부재의 초음파 감쇠계수에 의한 계면균열 길이의 측정
정남용(Namyong Chung),박성일(Sungil Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, the ultrasonic attenuation coefficient was measured by interfacial crack lengt in the adhesive components of double-cantilever beam(DCB). The energy release rate, G, was obtained by the experimental measurement of compliance. The numerical analysis by the boundary element method(BEM) and Ripling's equation were investigated. The experimental results represents that the relation between interfacial crack length for the ultrasonic attenuatio<br/> coefficient and energy release rate is increased proportionally. From the experimental results, a measurement method of interfacial crack length by the ultrasonic attenuation coefficient was proposed and discussed.<br/>
이종 접합재의 두께 변화에 따른 초음파 감쇠계수와 계면균열 길이의 측정
정남용(Namyong Chung),박성일(Sungil Park),박철희(Chulhee Park) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The initiation and propagation of interface crack on the adhesive and bonded component of car body lead to car accidents involving causalities and economic loss. It is very significant to establish the measurement method of interfacial crack by applying the ultrasonic technology into the interface of homogeneous adhesive and dissimilar bonded component. In this paper, an interfacial crack length has been measured by using the ultrasonic attenuation coefficient on the A1/Ced./A1 and AI/Epoxy components of double-cantilever beam(DCB). The correlations between energy release rates which were investigated by the experimental measurement, the boundary element method (BEM) and the Ripling's equation were compared with each other. The experimental results represent that the interfacial crack length for the ultrasonic attenuation coefficient and energy release rate is increased proportionally. From the experimental results, we proposed a measurement method of the interfacial crack lengths by the ultrasonic attenuation coefficient and discussed it.<br/>