• 한국소음진동공학회논문집
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• 제17권3호
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• pp.213-219
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• 2007

Column mixer Is one of the facilities to mix fluids at petrochemical plants. The vibration of column mixer is usually caused by pumps for fluid inflow and mixing of inside fluids. This fluid induced nitration is mainly responsible for the reduction of column life. Measurements were performed for understanding the vibration characteristics of the column. First measurement results showed the need of stiffness reinforcement. After the reinforcement work, second measurement confirmed the difference between two results. Modal analysis was also performed to investigate the resonance of the column vibration and the damage of the rib plate. To confirm fluid induced vibration at the column mixer fluid structure interaction analysis using ADINA/FSI was performed, which showed the necessity of the modification of the rotary valve.

• Journal of Chest Surgery
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• 제54권5호
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• pp.400-403
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• 2021

A 63-year-old patient was admitted with a sternal fracture and mass. On evaluation, most of the body of the sternum had been destroyed by a tumor. Radical resection of the sternum was performed and part of the major pectoral muscles adherent to the sternal tumor was also resected. The chest wall defect was reconstructed with mesh, bone cement, and a titanium rib plate system. Reconstruction with this method seemed to be an appropriate procedure to prevent instability of the chest wall.

• 한국강구조학회 논문집
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• 제18권3호
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• pp.289-299
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• 2006

강바닥판 교량은 비교적 얇은 강판을 서로 용접에 의해 연결한 구조물로서 많은 양의 용접을 피할 수 없다. 강바닥판의 횡리브복부판에서는 전단력과 비틀림 모멘트가 작용하는 동시에 종리브의 비틀림으로 인한 면내 면외 변형이 작용하기 때문에 종리브-횡리브 복부판-데크플레이트 교차부 및 횡리브복부판 컷아웃(슬릿)부에서 응력집중 현상이 두드러지게 발생하게 된다. 본 논문에서는 교차부 및 컷아웃(슬릿)부에서의 응력집중 현상 완화 및 피로성능 개선에 유리한 구조상세를 도출하고자 교차부에 스캘럽 유무 및 횡리브 복부판면과 일치되도록 종리브 내부에 설치하는 다이아프램의 설치 유무를 매개변수로 구조해석을 수행하였다. 다이아프램을 설치하는 동시에 교차부에 스캘럽을 두지 않을 경우 교차부 및 컷아웃(슬릿)부에서 최대응력 감소효과가 있음을 알 수 있었다. 따라서 교차부 및 컷아웃부에서의 응력집중 현상을 완화시켜 피로성능 개선에 기대효과가 있음을 알 수 있었다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
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• pp.17-20
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• 2008

본 연구에서는 강-프리스트레스트 콘크리트(PSC) 복합 보의 연결부 거동과 시공성을 향상시키기 위해 perfobond rib를 적용한 연결부를 제안하였으며, 보 실험을 통해 제안된 연결부의 성능을 검증하였다. 강 플레이트 상 하면에 perfobond rib로 이루어진 연결부를 이용하여 중앙에 위치한 강형부와 지점에 위치한 PSC형부를 연결한 3.9m 길이의 보 실험체 3개를 제작하여 재하실험을 수행하였다. 재하실험 결과, 제안된 연결부를 갖는 보 실험체는 PSC형부의 파괴에 의해 전체 보 부재의 파괴와 극한강도가 지배된다. 또한, 균열의 진전형상과 초기강도, 극한강도 도달까지의 하중저항능력을 분석한 결과, perfobond rib를 적용한 연결부는 기존의 stud를 적용한 연결부만큼 구조적으로 우수한 것으로 판단된다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2009년도 추계학술대회 논문집
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• pp.27-28
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• 2009

• 복합신소재구조학회 논문집
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• 제4권2호
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• pp.39-44
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• 2013

This study is aimed to examine the influence of the rotational stiffness of U-shaped ribs on the local buckling behaviors of laminated composite plates. Applying the orthotropic plates with eight layers of the layup $[(0^{\circ})4]s$ and $[(0^{\circ}/90^{\circ})2]s$, 3-dimensional finite element models for the U-rib stiffened plates were setup by using ABAQUS and then a series of eigenvalue analyses were conducted. There is a need to develope a simple design equation to establish the rotational stiffness effect, which could be easily quantified by comparing the theoretical critical stress equation for laminated composite plates with elastic restraints based on the Classical laminated plate theory. Through the parametric numerical studies, it is confirmed that there should clearly exist an increasing effect of local plate buckling strength due to the rotational stiffness by closed-section ribs. An applicable coefficient for practical design should be verified and proposed for future study. This study will contribute to the future study for establishing an increasing coefficient for the design strength and optimum design of U-rib stiffened plates.

• 한국강구조학회 논문집
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• 제26권4호
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• pp.349-359
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• 2014

강판콘크리트(SC)구조 벽-바닥접합부는 표면 강판에 의해 콘크리트가 나뉘게 되며 이 때문에 바닥 단부의 응력 전달기구가 RC구조의 것과 다를 것으로 예상된다. 따라서 본 연구에서는 리브가 부착된 SC구조 벽-바닥 실험체의 거동 및 내력평가를 수행하였다. 리브가 부착된 SC벽바닥 접합부의 접합성능을 확인하기위하여 7가지의 접합부 모형을 제작하고 단조 가력실험을 수행하여 구조내력 및 거동특성을 실험결과분석을 통해 고찰하였다. 제안식의 신뢰성을 확보하기위해 유한요소 해석을 수행하였다. 실험체 변수로는 가력지점, 마찰계수이며 이들의 영향에 대해 검토되었다. 실험체 파괴모드 분석을 통해 접합부 내력을 확인하였다. 제안식은 대부분 보수적인 값으로 확인되었다.

• Asian-Australasian Journal of Animal Sciences
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• 제3권2호
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• pp.97-102
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• 1990

A procedure to standardize camel carcass fabrication is proposed. This includes a definitive method of jointing the carcass into wholesale neck, shoulder, brisket, rib, plate, loin, flank, rump and leg cuts. Carcass cutout data were collected from the right sides of 21 Najdi male camels averaging 8, 16 and 26 months of age in order to determine the influence of age on the weight of each wholesale cut. The weight of body, empty body, hot carcass, cold carcass, hump fat, kidney, pelvic and heart fat (KPH) and each wholesale cut increased (p < .01) with age. Except for percent shrinkage and wholesale rump weight, all studied traits increased (p < .01) linearly as the age increased. This change was most pronounced in wholesale flank and plate cuts, increasing by 4.2 and 3.4 times, respectively, while the rump and shoulder cuts changed the least, increasing by 1.8 and 1.9 times, respectively. Allometric growth coefficients indicated that as the camel grew, the weight of rib, brisket, plate and flank cuts increased relatively more rapidly than did cold carcass or empty body weight and that the weight of wholesale shoulder, neck, leg and rump increased less rapidly than did cold carcass or empty body weight.

• 대한기계학회논문집B
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• 제22권4호
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• pp.510-519
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• 1998

Recently, computer modelling is increasingly used as a design tool, which requires more detailed data for heat transfer coefficients in various regions of the induction motor. But there are little information about those of rotor fan and endring because of difficulty in measuring signals in rotating bodies. In the present studies, the temperature signals were precisely measured with self-developed telemetry system, which had multi-channels and high rotational speed. After some losses were compensated, the heat transfer coefficients of the rotor endring and fan surfaces were measured. Minimum heat transfer region was existed with endcap plate distance and maximum heat transfer was found at some rotor fan width. It was also studied that how the guide plate and endcap inside rib effected on the rotor heat transfer. The higher heat transfer were obtained with decreasing guide plate distance, increasing the number and height of endcap inside rib. The correlation equations of the results were obtained and compared with others. Above results of the heat transfer coefficients can be used as basic data for cooling design of the various kind of motors.

• 대한기계학회논문집
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• 제11권2호
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• pp.214-221
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• 1987

본 논문에서는 2차원충돌분류에서 사각리브(rib)를 갖는 요철형전열면에 대한 실험에 관한 것이며, 리브의 높이를 (ｅ=5nm) 일정하게 하고 리브의 피치(ｐ=25,35,50 nm) 변화, 노즐출구와 전열면간 거이(H/B=1~14) 및 노즐출구유속(ｕ$_{e}$=12.30~ 18.07m/s)의 변화에 따른 전열특성을 실험적으로 구명하고 평판전열면의 경우와 비교 검토한다. 또한 스모크와이어(smoke-wire)법으로 평판 및 리브판에서의 유체의 거동 을 가시화하여 전열기구의 정성적 특성을 검토하는데 목적이 있다.