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강성일(Seong Il Kang),주진원(Jin Won Joo) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The task of representing a real structure by an idealized model is an important aspect of engineering work. Most of the structure consisting of slender members like bridges, towers and ladders are assembled by bolting and welding. On the finite element analysis(FEA) of these structures, LINK elements which is assumed to be axially loaded are widely used. This paper presents the effect of element type used in the FEA of large scale structure. FEAs modeled with LINK element and BEAM element are conducted for several structures to compare the solutions and investigate the bending effect. In order to verify the results calculated by FEA, structural test by using strain gage apparatus is conducted for a 52 meter-high ladder structure for fire protection. Stresses at selected locations are compared with those by FEA.
강성일 ( Seong-il Kang ),주진원 ( Jin-won Joo ) 충북대학교 산업과학기술연구소 2016 산업과학기술연구 논문집 Vol.30 No.1
In this paper, the development of a deadweight type 6-component force/moment generating system for evaluating the characteristics of multi-component loadcell is presented. The test equipment for generating three-component forces and three-component moment was designed by dividing the device for measuring the force Fx, Fy and the moment Mz, and for measuring the force Fz, the moment Mx and My. Several new methods for moment generation are introduced in order to produce accurate force/moment and to minimize the coupling effect. Calibration tests were performed to evaluate output strain and coupling strains of a six-component loadcell. After compensating the position difference between loading surface and center surface of the loadcell body, it is shown from the calibration results that the force/momet generating system developed could be useful for evaluating the characteristics of multi-component loadcells.
해상 환경과 유종에 따른 기름의 특성 변화 예측을 위한 기계학습 활용 가능성 feasibility study
강성일(Seong Il Kang),허철(Cheol Huh) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.10
해양 사고로 인해 대규모 기름 유출 시 이의 영향을 파악하고 적절히 대응하기 위해서는 기름의 특성을 파악하는 것이 필수적이다. 대표적인 특성으로 점도는 사고 후 시간 경과와 해상 환경조건 등에 의해 풍화과정을 거치게 되고 이로 인해 급격하게 변화한다. 이러한 기름 특성 변화를 파악하는 것이 중요하다. 본 연구에서는 해상 환경과 유종에 따른 기름의 특성 변화 예측을 위하여 기계학습 활용이 가능한지 타당성 분석을 수행하였다. 세부적으로 기계학습을 이용하여 시간경과에 따른 점도 변화를 예측하였으며 또한, 점도로부터 유출유의 종류를 예측하는 것이 가능한지도 살펴보았다. In order to identify and properly respond to the effects of large-scale oil spills due to marine accidents, it is essential to identify the properties of oil. As a representative characteristic, viscosity undergoes a weathering process due to the passage of time after the accident and the marine environmental conditions, and changes rapidly. It is important to identify these changes in oil properties. In this study, a feasibility study was conducted on whether machine learning can be utilized to predict changes in oil properties according to the marine environment and species. In detail, mechanical learning was used to predict the change in viscosity over time, and we also examined whether it is possible to predict the type of spillage oil from viscosity.
강성일(Seong Il Kang),주진원(Jin Won Joo) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper presents the strain analysis for proposed the flexible fixed ends for sensing strain on six component force/torque sensor of cross type beam. Fundamental strain analysis of cross type beam having rigid fixed ends and flexible fixed ends is performed by finite element analysis. In order to obtain similar output sensing strains from the six component loads and minimize coupling strains, the optimal location of strain gages is determined the strain gages are connected so that the bridge circuits with four strain gages would be balanced. Using designed fixed ends instead of rigid fixed ends, remarkable increment in output sensing strain can be achieved for force and toque.
강성일(Seong-Il Kang),윤영민(Yeong-Min Yun),김병기(Byeong-Ki Kim),임우택(Woo-Taek Lim),이민우(Min-Woo Lee),김순배(Soon-Bae Kim) 대한영상의학기술학회 2013 대한영상의학기술학회 논문지 Vol.2013 No.-
목 적 : 슬관절 전치환술(total knee arthroplasty, 이하 TKA) 환자에서 슬개골 접선방향 촬영법을 변화(modify)시켜 수술 환자의 상태에 맞는 가장 효율적인 검사방법을 찾고, 유동적인 merchant 보조기구의 유용성을 평가 하고자 하였다. 대상 및 방법 : 2012년 10월부터 12월까지 슬관절 전치환술(TKA)을 받은 환자 중 merchant view로 추적 검사(F/U)를 시행한 환자 20명(남:5, 여:15, 평균70.4세)을 대상으로 하였다. 슬개골 접선방향 촬영법으로 merchant 검사를 시행하였고, 유동적인 merchant 촬영 보조기구를 이용하여 슬관절을 30°,45°,75°로 굴곡(flexion)하여 각각 검사를 진행하였다. 그리고 환자를 세운뒤 무릎을 45° 구부리고 modified weight-bearing axial view검사를 시행하였다. 이렇게 획득된 영상은 일치각(congruence angle)과 구각(sulcus angle)의 값을 구하여 정량적으로 평가하였다. 통계프로그램은 SPSS ver20.을 사용하였다. 그리고 정성적 평가는 슬개골의 외측 및 내측 가장 자리의 겹침 여부, 대퇴활차구와 경골 조면의 겹침 여부, 슬개골 융기 첨부의 겹침 여부를 방사선사 5명이 아주 나쁨(1점), 나쁨(2점), 보통(3점), 좋음(4점), 아주 좋음(5점)으로 5점 척도로 평가 분석 하였다. 결 과 : 정성적 분석은 modified weight-bearing axial view가 평균 3.9로 가장 좋은 결과를 보였으며 merchant 30°, merchant 45°, merchant 75° 순위였고, 정량적 분석에서 구각(sulcus angle)은 modified weight-bearing axial view에서 146.36±3.0으로 merchant 30°, merchant 45°은 각각 147.87±2.5, 145.88±2.8으로 나타났으며(p>0.05), merchant 75°에서는 143.18±2.8으로 차이를 보였다(p<0.05). 일치각(congruence angle)은 modified weight-bearing axial view에서 21.33±8.1으로 merchant 30°, merchant 45°, merchant 75°에서 각각 21.26±13.64, 17.81±10.77, 17.12±11.15으로 나타났다(p>0.05). 결 론 : modified weight-bearing axial view 검사에서 우수한 영상을 얻었으나 수술 후 거동이 불편한 환자에게 많은 부담을 안겨 주며, 업무효율성의 저하 또한 우려된다. 하지만 merchant 보조기구를 이용하여 다양하게 무릎을 굴곡 시켜 검사한다면 환자의 상태에 따라 가장 좋은 영상을 얻을 수 있어 simple x-ray 영상에서도 슬관절 전치환술(TKA) 환자의 슬대퇴 관절의 평가에 도움을 줄 수 있을 것이라 사료된다. Purpose : Radiography by varying the tangential patella in total knee arthroplasty(TKA) surgery patients, looking for the most efficient exam method according to the status of surgical patients, and to evaluate the usefulness of merchant device. Materials and methods : During 2 months from October to December 2012, total 20 patients(5 males and 15 female, average age 70.4 years) who underwent total knee arthroplasty(TKA). we performed tangential knee tests with the change of the knee angle ;30°,45°,75° using a Merchant device. we performed modified weight-bearing axial view tests to patients on erect position at 45 degree flexion of knee. The quantitative evaluation of the sulcus angle and the congruence angle each. Qualitative analysis was evaluated visually using a five point rating scale by the five radiologic technologists Result : Results show modified weight-bearing axial view is the best on average3.9, merchant30 °, merchant45 °,is the degree merchant 75°, qualitative analysis, Sulcus angle from the quantitative analysis of modified weight-bearing axial view and 146.36±3.0, merchant 30 ° 147.87±2.5 merchant 45° 145.88±2.8(p>0.05), and merchant 75° differed 143.18± 2.8(p<0.05). congruence angle, the modified weight-bearing axial view from 21.33±8.1, merchant 30°, merchant 45°, merchant 75° from each was 21.26±13.64, 17.81±10.77, 17.12±11.15 as(p> 0.05). Conclusion : When by flexion the knee examined using various merchant device, can get the best image according to the state of the patient. Is considered to be able to help through the evaluation of femoral joint through a patient s total knee arthroplasty in image of simple x-ray.