한국 건설 산업 생산성의 국제경쟁력 분석

원종성,이강,Won, Jong-Sung,Lee, Ghang 한국건설관리학회 2008 건설관리 : 한국건설관리학회 학회지 Vol.9 No.4

2003년 이전 국내 건설 국제경쟁력 비교연구에서 우리나라 건설 생산성이 미국, 영국, 일본 등의 선진국에 비하여 낮은 것으로 보고되었다. 그러나 2003년 이후 우리나라 해외 건설수주 물량도 매년 크게 늘고 있으며, Petronas Tower, Burj Dubai와 같은 세계 최고층 건물을 수주, 건설하는 등 양적 질적으로 괄목할 만한 발전을 이루고 있다. 이 시점에서 우리나라 건설생산성의 현주소를 재평가할 필요성이 있다. 본 연구에서는 우리나라와 해외선진국과의 건설생산성을 비교하여 우리나라 건설산업의 국제경쟁력을 평가하고자 한다. 국내 통계자료와 외국 통계자료를 바탕으로 노동자 1인 기준 단위시간동안 생산하는 총 공사액을 분석하여 각 국의 건설노동생산성을 측정하고 한국과 일본의 완공된 건축물을 대상으로 층당 소요되는 공사일수와 건축물의 지하층비율을 분석하여 시공경쟁력을 평가하였다. 분석결과, 우리나라의 건설생산성이 아직 건설 선진국인 미국이나 일본보다는 뒤쳐져 있으나 영국보다는 앞서는 것으로 분석되었다. In the previous comparative studies of international competitiveness conducted before 2003, Korean construction productivity had been estimated to be lower (or poor) than that of developed countries such as US, UK, and Japan. However, the amount of international contracts Korean has won increased substantially, and Korean construction has progressed with creating two skyscrapers such as Petronas Tower and Burj Dubai. At this point we need to reevaluate what we are capable of. In this paper, we evaluated international competitiveness of our construction industry comparing to advanced countries by analyzing labor productivity. For evaluating construction competitiveness we measured labor productivity using the value of construction work in US dollar per hour based on domestic and foreign statistical data and analyzing completion days per a story and the ratio of underground floors to ground floors of buildings in Korea and Japan. As a result, although our construction productivity is not yet competitive with the US and Japan yet, we excel the UK.

커플링제 처리가 폴리케톤 섬유와 실리콘 고무의 계면접착에 미치는 영향

원종성,진다영,이지은,이승구,Won, Jong Sung,Jin, Da Young,Lee, Ji Eun,Lee, Seung Goo 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.1

Polyketone fiber, a newly developed super fiber, has a tenacity and modulus similar to the p-aramid fiber, and can be used for reinforcing mechanical rubber goods (MRG), such as tires, hoses, and protective gloves. However, the typical interfacial interaction between the polyketone fiber and the polymer matrix is relatively weak, such that the inclusion of polyketone fibers could create defects in the composites, which can easily result in failure. Therefore, it is necessary to modify fiber surfaces to improve wettability for optimization of the fiber-matrix interfacial bonding. In this study, the interfacial adhesion between polyketone fibers and a silicone rubber matrix was enhanced by surface treatments using coupling agents to modify the surface morphological and chemical properties of the polyketone fibers. The effects of coupling agent treatments on the surface of the fiber and interfacial adhesion of the Polyketone/Silicone rubber composites were characterized using dynamic contact angle analysis and X-ray photoelectron spectroscopy (XPS). Morphological changes were observed, by varying the coupling agent content, using a scanning electron microscope (SEM).

폴리페닐렌 설파이드를 도입한 에폭시 수지의 제조 및 특성 분석

원종성,박종현,정진욱,이승구,Won, Jong Sung,Park, Jong Hyun,Jeong, Jin Wook,Lee, Seung Goo 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.2

In recent decades, there has been an increasing interest in the use of thermosetting-resin composites in military aircraft and other aerospace applications because they present higher strength and stiffness properties than their metallic counterparts. However, thermosetting-resin composite materials have a low resistance to impact compared to metals. Therefore, high-toughness thermoplastics have been used as tougheners in thermosetting resins because they do not compromise any of the desirable properties of thermosetting-resin systems. In this study, the improvement in the impact damage tolerance of epoxy-resin composites was investigated by introducing polyphenylene sulfide (PPS), an engineering thermoplastic, into the epoxy resin system at loadings of 0, 10, 20, and 30 phr. Consequently, the impact strength and heat resistance of the epoxy-resin composite mostly increased with the addition of PPS.

Primer 처리에 의한 폴리케톤 섬유/천연고무 복합재료의 계면접착 및 내피로성

원종성,진다영,손한글,홍영기,이승구,Won, Jong Sung,Jin, Da Young,Son, Han Geul,Hong, Young Ki,Lee, Seung Goo 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.2

Cords have commonly been used as reinforcing materials in rubber composites. To improve cord/rubber interfacial adhesion, the cords are usually coated with an adhesive (typically based on Resorcinol-Formaldehyde-Latex(RFL)). These cord/rubber composites have been used in many sectors such as the tire, hose and belt industries. Interfacial adhesion between cord and rubber is an important determinant of the durability of the composite system. In this study, newly developed polyketone cord was coated by dipping in various RFL-based adhesive primers and then bonded to natural rubber by a compression molding method. The resin/latex ratio in the RFL adhesive primer was varied in order to achieve the optimal mixing ratio. Polyketone cord was treated with primers at various heating temperatures and dipping times. To measure the adhesion strength between the polyketone cord and the natural rubber, and the fatigue resistance of the composite system, the H-test and the tension-compression test were performed. The surface of the polyketone cord treated with primer was examined by attenuated total reflectance (ATR) spectroscopy and other instrumental techniques.

고내열성 페놀수지의 경화거동 및 열분해 특성 연구

원종성(Jong Sung Won),이지은(Ji Eun Lee),김주연(Ju Yeon Kim),김연철(Yun Chul Kim),윤남균(Nam Gyun Yun),이승구(Seung Goo Lee) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.5

본 연구에서는 노즐내열재용 매트릭스인 페놀수지의 경화거동 및 열분해 특성에 대해 연구하였다. 경화거동 연구는 노즐복합재 성형공정의 최적화를 위해 진행되었으며, 시차주사열량계(differential scanning calorimeter, DSC)를 이용한 등온분석법과 회전형 Rheometer를 사용하여 분석하였다. 또한 페놀수지의 열중량분석(thermo gravimetric analysis, TGA)을 통하여 얻어진 결과를 바탕으로 열분해 온도 및 열안정지수 등의 열분해 특성을 관찰하였다. In this study, the cure behavior and thermal decomposition characteristics of phenolic resin for rocket nozzle application were analyzed. For establishing an optimum curing cycle of the nozzle composite, cure behavior of phenolic resin was investigated by using a differential scanning calorimeter (DSC) under isothermal conditions and a rotational rheometer. And the thermal decomposition characteristics of phenolic resin were studied by initial decomposition temperature (IDT) and thermal stability factors from results of thermo-gravimetric analysis (TGA).

BIM 협업 조직 및 정보관리 방식에 관한 사례연구

원종성(Won Jong-Sung),이정주(Lee Jeong-Joo),이강(Lee Ghang) 대한건축학회 2008 대한건축학회논문집 Vol.24 No.8

As information technology and the skills of communication rapidly advance, the number of BIM implementations in the field is also increasing. Collaboration and communication among project participants are important factors of BIM implementation. In this paper, we discussed collaboration and information management in BIM implementation based on case studies we conducted of successful international projects implementing BIM. The size of the project is more extensive than the previous one, so legal liability among the participants was higher. Because reuse and sharing of information are important in the BIM process, the minimizing of conflicts is a key factor for success. The master BIM model centers on information exchange and coordination of BIM collaboration. Successful projects require the efficient management of the master BIM model. Project managers must therefore make information mangers like Digital Design Director (DDD)or organizations that are in charge of information exchange, coordination, and changed models. Also, project mangers introduced the integrated project delivery method to help consultants and construction companies participate in the design phase. The integrated project delivery method can boost the efficient progress of projects. BIM implementation in Korea is at an early stage compared to other developed countries. As BIM spreads rapidly in Korea, we expect that difficulties in collaboration among participants will also increase, as it did in the international projects we examined. For future construction projects to go smoothly without any communication difficulties, I believe the Korean construction industry needs to accept management of the master BIM model, information exchange, and coordination of the BIM process, each of which is discussed in the case study of this paper.

극한 환경용 소재 극한환경용 복합재료의 개발 현황

원종성 ( Jong Sung Won ),이승구 ( Seung Goo Lee ) 한국공업화학회 2014 공업화학전망 Vol.17 No.5

다양한 산업분야의 부품소재를 비롯하여 일상용품에 이르기까지 새로운 특성을 지닌 복합재료에 대한 수요가 증가하고 있으며, 특히 산업이 점차 고도화, 세분화됨에 따라 극한환경에서 요구되는 엄격한 규제조건을 충족시킬 수 있는 차세대 소재에 대한 필요성이 증대되고 있다. 이러한 문제의 극복은 복합재료의 개발로 인하여 해결되고 있으며, 이 중 섬유강화 복합재료가 많은 비중을 차지하고 있다. 복합재료란 특수한 기능향상을 위해 2개 이상의 물질을 물리적, 화학적으로 혼합한 재료로써 단일소재에서는 볼 수 없는 복수의 기능 및 목적에 적합한 특성을 실현한 재료라 할 수 있다. 본고에서는 극한환경에서 사용되는 섬유강화복합재료와 최근 대두되고 있는 바이오복합재료의 제조공정, 특성, 적용분야와, 그리고 주요 선진국과 우리나라의 최신개발현황을 살펴보았다. 또한, 국내외 기술동향 분석을 통하여 국가의 전략 소재의 독자적인 개발과 일반산업으로의 상용화에 대하여 복합재료가 나아가야 할 방향을 제시하고자 하였다.

폴리에테르설폰/다관능성 에폭시 블렌드의 경화거동 및 강인화 특성

원종성(Jong Sung Won),이지은(Jee Eun Lee),박종규(Jong Kyoo Park),이만영(Man Young Lee),강송희(Song Hee Kang),이승구(Seung Goo Lee) 한국고분자학회 2019 폴리머 Vol.43 No.1

본 연구에서는 triglycidyl p-aminophenol(TGAP)/diglycidylether of bisphenol F(DGEBF) 에폭시 수지의 polyethersulfone(PES) 첨가에 따른 경화 거동과 파괴인성을 연구하였다. 경화 거동은 DSC 분석에 의해 승온 및 등온 조건에 따라 연구를 진행하였다. 승온분석에서는 Ozawa와 Kissinger법을 이용하여 다양한 승온속도에서 얻어진 발열피크로부터 활성화에너지를 도출하였다. 또한 등온분석에서는 TGAP/DGEBF 에폭시 블렌드의 자촉매 효과를 고려한 Kamal의 속도모델을 이용하여 분석을 진행하였다. TGAP/DGEBF 에폭시에 대한 PES 함량에 따른 블렌드의 인장과 굴곡특성 및 파괴인성을 분석하였으며, 파괴인성 시험 후 파단면의 표면형태학적 변화도 관찰하였다. 결과적으로, TGAP/DGEBF 에폭시에 대한 PES의 첨가는 경화도와 경화속도 및 활성화에너지에 큰 영향을 미치지 않았으나, 인장강도, 굴곡강도, 굴곡탄성률은 저하되었다. 반면, 파괴인성에서는 PES 함량이 증가함에 따라 임계응력 세기인자와 임계변형에너지방출률 모두 증가하였다. The cure behaviors and toughness properties of triglycidyl p-aminophenol/bisphenol F diglycidylether resin system with 4, 4-diaminodiphenylsulfone hardener were studied with the inclusion of polyethersulfone (PES). The cure kinetics of epoxy blends were investigated in both dynamic and isothermal conditions by differential scanning calorimetry (DSC). In dynamic experiments, the activation energy was evaluated by Ozawa and Kissinger’s equations at different heating rates (2~40 ℃/min). Isothermal DSC data at different temperatures (160~220 ℃) are fitted to an autocatalytic Kamal kinetic model. The tensile, flexural, and fracture toughness of the epoxy blends were investigated by taking into account their morphological features, which were influenced by the PES contents. Consequently, the results obtained from cure behavior studies further indicated that the degree of cure, rate of cure, and activation energy of the epoxy resins were not largely affected by the PES inclusion, while fracture toughness values of them increased with the PES content.

폴리케톤 섬유의 산소 플라즈마 처리에 따른 천연고무와의 계면접착 특성

원종성 ( Jong Sung Won ),최혜영 ( Hae Young Choi ),유재정 ( Jae Jung Yoo ),최한나 ( Han Na Choi ),용다경 ( Da Kyung Yong ),이승구 ( Seung Goo Lee ) 한국 접착 및 계면학회 2012 접착 및 계면 Vol.13 No.1

자전거-운전자 상호작용을 고려한 주행 안정성 해석

원종성(Jong-Sung Won),탁태오(Tae-Oh Tak),김래겸(Lae-Kyeom Kim),백광열(Gwang-Yeol Baek) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11

Bicycle driving is a typical man-machine interface system. Up to this point, most dynamic analyses of bicycles have been focused on bicycles, thus the effects of human driver have been neglected. In this research, by qualitatively measuring bicycle and human driver motion to stabilize the bicycle when subjected to sudden lateral disturbance, human drive’s steering angle control law is deduced as a function of roll angle, driver upper body lean angle against bicycle, lateral acceleration, and yaw rate. Combining a bicycle multibody model by ADAMS and human driver model by LifeMOD, an interactive driver-bicycle model has been setup. The derived steering angle control law has been implemented to the driver-bicycle model to simulate stabilizing motion, which showed good agreements with the experimental result.