이종소재인 CFRP와 알루미늄의 접착력 향상을 위한 Bead의 영향 평가

신동우,김진재,이종혁,권일준,박성민,Shin, Dong-Woo,Kim, Jin-Jae,Lee, Jong-Hyuk,Kwon, Il-Jun,Park, Sung-Min 한국복합재료학회 2017 Composites research Vol.30 No.4

In this paper, we investigated the application method and properties of 0.1 mm, 0.2 mm and 0.3 mm beads, which can secure a certain thickness due to the molding stability of joint surfaces of different materials (aluminum and composite). In order to verify this, the influence was evaluated according to the thickness of the adhesive in the Double lap test and the FEM simulation. As a result, it was confirmed that as the content of the bead of the adhesive increased more than 1%, the strength of the adhesion increased and the elongation decreased. We confirmed as the size of the bead became larger, the rigidity became lower and the elongation increased. 본 논문에서는 알루미늄과 복합재료에 대한 이종소재 접합면의 성형안전성을 위해 일정한 두께를 확보할 수 있는 0.1 mm, 0.2 mm, 0.3 mm bead의 적용 방법과 물성변화에 대해 연구하였고, 이를 검증하기 위해 더블랩 시험과 FEM 시뮬레이션으로 접착제의 두께에 따라 미치는 영향을 평가하였다. 그 결과, 접착제에 bead의 양을 1% 이상 함량이 증가함에 따라 접착 소재의 강도가 높아지고 신율이 감소함을 확인하였고, bead의 크기가 커질수록, 강성은 낮아지고, 신율은 증가함을 확인하였다.

이하선에 발생한 소관 선종

신동우,정웅윤,심정연,박정수,Shin Dong-Woo,Chung Woung-Youn,Shim Jeong-Yun,Park Cheong-Soo 대한두경부종양학회 1997 대한두경부 종양학회지 Vol.13 No.2

Parotid canalicular adenoma is a benign neoplasm that is predominantly composed of branching and interconnecting cords of single or double rows of columnar epithelium in a very loose stroma. There has been considerable confusion in the literature concerning the terminology of canalicular adenoma. However, thesedays it has been newly-recognized as a discrete entity of the monomorphic adenoma group. Canalicular adenoma has a remarkable predilection for occurrence in the minor salivary glands such as the upper lip, in contrast with basal cell adenoma that occurs predominantly in major salivary glands such as the parotid gland. We have experienced a case of canalicular adenoma of the parotid gland in a 65-year-old woman. The patient had a palpable mass on the preauricular area for the last 15 years and recently noticed a mild pain and discomfort on the mass. Neck ultrasonography showed a low echogenic mass of 1.0cm in diameter in the right parotid gland and a neck CT scan showed a well-enhanced rectangular-shaped mass. A superficial parotidectomy was performed for the lesion and the final pathologic diagnosis turned out to be 'multifocal canalicular adenoma'.

신체 부위에 따른 지방조직의 특성: 컴퓨터단층촬영 및 조직학적 소견

신동우,손대구,박무식,김준형,한기환,Shin, Dong-Woo,Son, Dae-Gu,Park, Mu-Shik,Kim, Jun-Hyung,Han, Ki-Hwan 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.5

Purpose: The subcutaneous fat tissue is separated into 2 layers by the subcutaneous fascia: the superficial and deep fat layers. The two fat layers have different structures according to the body regions. The purpose of this study is to evaluate the distribution and pattern of the two fat layers in the human body by computed tomography (CT) and histological analysis according to age, sex, anatomical region, and body mass index (BMI). Methods: This study included 200 males and 200 females who underwent 64-channel dynamic CT in our hospital. The patients were divided into 5 groups according to 10 years of their ages separately in either male or female gender. The thickness of the superficial and deep fat layers was measured in the abdominal, pelvic, and femoral regions, and we analyzed the values. Statistical analyses were performed using SPSS software. The $3{\times}3$-cm whole fat layers were harvested from the same sites of 3 cadavers for histological examination, and one cadaver was dissected for gross evaluation. Results: The total thickness of subcutaneous fat tissue was greater in females than in males, and the ratio of the superficial fat layer to the whole fat layer was higher in females. The superficial fat layer became thinner with increasing age in males. As BMI increased, the total fat layer became thicker, and the superficial fat layer became thicker than the deep fat layer. On histological examination, the superficial fat layer had small adipose lobules and showed a densely distributed pattern in the abdominal region, whereas in the femoral region, it had large adipose lobules and showed a sparsely distributed pattern. There were no significant differences in the histological findings of the deep fat layer between the 3 body regions. Conclusion: Significant differences in histological findings of the two fat layers were found in relation to age, sex, anatomical region, and BMI. The superficial fat layer became thinner with increasing age in males, but it was constant in females. As BMI increased, the total thickness of subcutaneous fat tissue became greater, and the superficial fat layer became thicker than the deep fat layer. Our measurements can be used to understand the characteristics of the fat layers in relation to age, sex, anatomical region, and BMI.

탄소-아라미드 복합소재 로봇암의 진동감쇠 물성시험과 전산해석

신동우,권일준,박성민,박용민,최진경,Shin, Dong-Woo,Kwon, Il-Jun,Park, Sung-Min,Park, Yong-Min,Choi, Jin-Kyung 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.6

In accordance with the increase in demand for LCDs and the increasing industry competition with higher productivity, the size of LCD glass has been gradually increasing. When transferring a robot hand by setting up an LCD panel, the vibration increases the inertia and load of up and down motion, rotational motion, and mobile motion of the whole robot. With regards to the up and down motion of the robot hand, when time is short on study of the vibration reduction. In this paper, we evaluate the structural arm of an LCD robot by using finite element analysis and fast Fourier transform (FFT). An impact test of the arm, which is made from the composite materials of carbon fiber reinforced plastics (CFRP) and Kevlar fiber reinforced plastics (KFRP) for lightweight and damping, was conducted.

조기 위암의 근치적 절제술 후 재발예측인자

신동우,형우진,노성훈,민진식,Shin Dong Woo,Hyung Woo Jin,Noh Sung Hoon,Min Jin Sik 대한위암학회 2001 대한위암학회지 Vol.1 No.2

Purpose: Even with excellent surgical outcome, recurrence of early gastric cancer (EGC) after a curative resection is not declining because the incidence of EGC is increasing. The aim of this study was to propose an appropriate treatment strategy by assessing the risk factors for recurrence of curatively resected early gastric cancer. Materials and Methods: Of 3662 patients who had undergone gastric resections for gastric cancer from 1987 to 1996, the cases of 1050 curatively resected EGC patients were reviewed retrospectively. Among those 1050 patients, 50 patients ($4.8\%$) were diagnosed as having recurrent cancer, which was confirmed by clinico-radiological examination or re-operation. The risk factors that determined the recurrence patterns were investigated by using univariate and multivariate analyses. Results: The mean time to recurrence was 30.9 months, and hematogenous recurrence was the most frequent type ($32.0\%$). Among the 50 recurred patients, peritoneal recurrence showed the shortest mean time to recurrence ($18.5\pm17.7$months). Between the recurred and the non-recurred patients, there was no statistically significant difference with respect to age, sex, operation type, tumor size, tumor location, gross appearance, or histological differentiation. However, depth of invasion (submucosal invasion) and nodal involvement were significantly different (P<0.001) between the two groups. Using logistic regression analyses, nodal involvement was the only significant risk factor for recurrence in early gastric cancer (P<0.001). The median survival after the recurrence had been diagnosed was 4 months. Conclusion: Although the prognosis for EGC patients is excellent and recurrence of EGC after a curative resection is rare, the time to recurrence and the patterns of recurrence in EGC patients were diverse and unpredictable, and the result after recurrence is dismal. Considering the impact of lymph node metastasis on recurrence of EGC, a systematic lymphadenectomy, rather than limited surgery, should be performed if lymph node involvement is confirmed pre- or intraoperatively. Also if the postoperative pathologic findings reveal lymph node involvement, adjuvant chemotherapy is recommended.

열경화성 수지의 온도에 따른 경화도와 비열(Cp) 변화

신동우 ( Dong Woo Shin ),황성순 ( Seong Soon Hwang ),이호성 ( Ho Sung Lee ),김진원 ( Jin Won Kim ),최원종 ( Won Jong Choi ) 한국복합재료학회 2015 Composites research Vol.28 No.3

본 논문에서는 복합재료 제조공정 중 온도에 따른 경화 반응을 이해하고 열분석을 수행하였으며, 이 결과를 바탕으로 온도에 따른 수지의 경화도 및 비열의 변화를 수식화하였다. 온도에 따른 경화도와 비열은 DSC와 MDSC (Modulated DSC)를 활용하여 측정하였다. DSC와 MDSC 분석은 Isothermal과 Dynamic 조건으로 수행하여 Cure Kinetics, 유리전이온도 및 비열을 측정하고, 회기 분석 방법을 이용하여 물성거동을 수학적으로 모델링하였다. This paper presents the cure kinetics studies on the cure reaction of thermosetting resin. Above all, change in degree of cure and specific heat capacity according to temperature are observed using DSC and MDSC. The results are analyzed by cure kinetics and specific heat capacity model. Glass transition temperature was also measured to apply to the specific heat capacity model. Model parameters were gained from the modeling result. As a result, behavior of specific heat capacity can be calculated mathematically.

현행 건설공사 물가변동 제도의 문제점 분석을 통한 계약금액조정 개선방안

신동우(Dong-Woo Shin),김기현(Ki-Hyun Kim) 한국구매조달학회 2009 한국구매조달학회지 Vol.8 No.1

건설 사업의 시공 계약체결 시 장기간에 걸쳐 수행되므로 다양한 변경요소가 존재하게 된다. 또한 대부분의 사업발주가 주문생산에 의해서 이루어지므로 계약서 자체만으로 계약이행의 진행과정에서 다양한 변경요소로 인해 제기되는 각종 클레임을 판단하고 처리함에 있어 그 한계가 있다. 그렇기에 건설공사의 경우 클레임으로 제기된 계약금액조정을 두고 발주자와 시공자간의 판단을 통한 조정과 협의로 결정해야 될 많은 사안이 발생하게 된다. 그 중 빈번하게 발생되고 있는 분야가 물가변동으로 인한 계약금액조정이다. 공공건설 사업을 시행하는 데 적용되는 국가를 당사자로 하는 계약에 관한 법률(‘국가계약법’)에서는 계약체결 후 일정기간동안 일정한 비율이상의 물가변동이 발생하면 계약금액을 조정하도록 규정하고 있으나 국가계약법령에서 규정하고 있는 물가 변동으로 인한 계약금액조정규정을 동일하게 적용하는데 한계가 있고 비합리적 성격을 가질 수도 있어 계약 이행주와 발주자, 시공자 모두 피해자로 전락하게 될 가능성이 높다. 본 연구에서는 공공공사 수행 시 물가변동에 따른 계약금액 조정절차의 개선방향에 관한 물가변동과 계약금액 조정에서의 문제점을 발견하여 그 해결방안을 모색하고자 하며, 다음 세 가지 개선사항을 제안한다. 첫째, 물가변동산출에 있어서 실적공정을 반영하도록 하며, 둘째, 법적근거를 마련하기 위하여 국가계약법에서 규정하고 있는 물가변동조항을 근본적으로 개정하고, 셋째, 공정표의 실제적 관리를 추진하도록 조치를 취해야 한다. In the case of construction contracts, because the project takes an extended period of time, there are many elements which require adjustments. Further, because these contracts are often made on order, it is difficult to file claims based solely on the conditions specified in the contracts. Thus, construction companies must often negotiate claims and the amount charged through negotiations. The problem is especially acute for price adjustments due to inflation. The Act on the Contract in which State is a Party makes provisions for contract price adjustment if inflation within a given period of time is beyond a certain range, but the current provisions have serious limitations, and often result in irrational results which result in losses for all participants. This study examines the problems inherent in current laws and regulations dealing with contract price adjustments for inflation, and examines some possible solutions. This study makes three recommendations. First, standards for measuring price inflation must be made more realistic; second, laws must be modified to allow the use of new standards; and third, schedules for standards must be managed more effectively.

메가기둥-테두리보 접합부의 구조성능 검증에 대한 실험연구

신동우(Shin, Dong Woo),최경규(Choi, Kyoung Kyu),박홍근(Park, Hong Gun) 한국콘크리트학회 2012 한국콘크리트학회 학술대회 논문집 Vol.2012 No.5

불균형모멘트를 재하받는 슬래브-기둥 접합부의 현행 설계기준 평가

신동우(Shin, Dong Woo),최경규(Choi, Kyoung Kyu) 한국콘크리트학회 2011 한국콘크리트학회 학술대회 논문집 Vol.2011 No.5

중력 여과장치 이용 미세조류 수확을 위한 여과막의 효율성 비교

신동우(Dong-Woo Shin),조용희(Yonghee Cho),김기현(Ki-Hyun Kim),김한별(HanByeol Kim),박한울(Hanwool Park),김지훈(Z-Hun Kim),임상민(Sang-Min Lim),이철균(Choul-Gyun Lee) 한국해양바이오학회 2017 한국해양바이오학회지 Vol.9 No.1

Cost-effective microalgae harvesting methods are necessary for economical production of algal biodiesel. In this study, membranes with various pore sizes and materials were examined for their potentials in application to gravity-filtration of Tetraselmis sp. KCTC12432BP. For this test, 10 L of Tetraselmis sp. culture (2 g/L) was loaded on each membrane and filtration rates were measured. Among the tested materials, a woven cotton fabric showed the fastest water drain rate (0.73 L/hr) without serious cell leakage. Cell density of the concentrates after filtration was 6.8 g/L, indicating 3.4-fold concentration compared with the initial algal culture. The result suggests that the woven cotton fabric could serve as filtration membrane for harvesting Tetraselmis sp. among the tested ones.