Rheo- compocasting 법에 의한 SiC 입자분산 복합재료의 마모특성에 관한 연구

곽현만,최창옥 ( Hyun Man Kwak,Chang Ock Choi ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.3

N/A Microstructure, hardness and wear characteristics of SiC_P/Al-6.5wt%Si-1.7wt%Mg alloy composites fabricated by the method of rheo-compocasting and hot pressing are investigated in this study. The dispersion of SiC particles in the composites is homogeneous and the hardness improves as additional amount increases. The wear amount of the matrix metal increases highly as wear rates increase, for the wear mechanism changes from adhesive wear to melt wear, and the matrix metal was coated on the surface of revolving disc and its weight increases. In the 5vol% composites, Fe is adhered on the surface of specimen by the projection of the dispersed hard SiC particles which have net-work structure and the coating layer is about 300㎛. But in the composite more than 20vol%, the wear amount of composite decreases because the SiC particles which have superior hardness, wear resistance and heat resistance properties resist wear, the abrasive wear turn out predominant wear mechanism and so the wear amount of revolving disc increases.

Rheo-compocasting 및 Hot Pressing 에 의하여 제조한 Al-Si-Mg / Al2O3 단섬유강화 복합재료의 조직 및 인장특성

곽현만,이학주 ( Hyun Man Kwak,Hag Ju Lee ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.6

N/A Aluminum alloy matrix composites reinforced with various amounts of Al₂O₃ short fibers have been produced by rheo-compocasting accompanied by hot pressing. When composites reinforced with fibers are produced by rheo-compocasting, S-L process is the most effective method for homogeneous dispersion of fibers. A sound composites with the improved orientation(3 dimension→2 dimension) of the fibers and increased volume fraction of them have been fabricated through the hot pressing of the casted composites. Fibers are broken down when rheo-compocasting, hot pressing, and T_6 treating. Among them fibers are broken down most heavily in the hot pressing. And even in the case of the composite reinforced with 30vol% fibers, which showed the hardest fiber break down, aspect ratio(11.6) is higher than critical aspect ratio(10.7). The fiber strengthening effect in the composites has showed up to 573K. As the test temperature increases to the range of 573K, the effect has been higher. The fracture of composites is controlled by fiber from room temperature to 473K, but the fracture of composites is controlled by interface between fiber and matrix alloy above 473K.

Rheo-compocasing 법에 의한 SiCp / Al 합금기 복합재료의 제조 및 마모특성

이학주,곽현만,홍준표 ( Hak Joo Lee,Hyun Man Kwak,Chun Pyo Hong ) 한국주조공학회 1991 한국주조공학회지 Vol.11 No.2

N/A Microstructure and wear characteristics of SiCp /Al - 6.5wt%Si - 1.7wt%Mg composite materials fabricated by rheo-compocast and hot press were investigated in this study. The results obtained are as follows : 1) It was possible to fabricate favorable composite materials containing SiCp which is up to 26 vol% by rheo-compocast and hot press. 2) Si and Al₂Si₄O_(10) were formed on the surface of SiC particles, and fairly good bonding condition was obtained on the interface between SiCp and matrix alloy. 3) Wear mechanism was transformed into adhesion, oxidation and fusion on the matrix alloy as wear rate increases, but in the composite material, the abrasive mechanism was shown not depending on the wear rate. 4) Wear resistance was improved as the amount of SiCp increases, however, no remarkable change in wear resistance was found above 8vol% of SiCp.

공중 민항기 근무자를 위한 신경계 운동 치료

곽현(Hyun Kwak),조진한(Jin Han Cho),이상엽(Sangyeoup Lee) 한국항공우주의학협회 2003 항공우주의학회지 Vol.13 No.3

국제물류정보시스템과 효율적인 물류관리 합리화방안에 관한 연구

곽현(Hyun Kwak),이기웅(Ki-woong Lee) 국제e-비즈니스학회 2006 e-비즈니스 연구 Vol.7 No.2

소셜미디어 연구의 흐름: 경영학 관련 연구의 메타분석

곽현 ( Hyun Kwak ),박선주 ( Sun Ju Park ),정승화 ( Seungw Ha Chung ),정예림 ( Yerim Chung ) 한국지식경영학회 2015 지식경영연구 Vol.16 No.2

The number of studies on social media has increased rapidly worldwide. There has been, however, little effort to assess the achievements and limitations of social media studies up to present. The purpose of this study isto provide a systematical viewpoint on social media research published by scholarly business-related journals. Our analysis focus on research topic, functionality, targeted media types, methodology, and characteristics. User research receives the most attention, followed by effect research in terms of developmental models of media research agenda. The major methodological trend is online survey. Facebook and twitter are the two most popular mediums studied in literature, and social media is mainly characterized as information sharing as well as relationship building. Two recommendations are suggested in ways to strengthen social media research: more various topics and application areas, and the rigor and diversity of research methods.

한국형 지식재산도시 조성을 위한 법적 근거 마련과 활성화를 위한 제언

곽현 ( Kwak Hyun ),곽충목 ( Kwak Choong Mok ),이헌희 ( Lee Heonhui ) 단국대학교 법학연구소 2019 법학논총 Vol.43 No.4

본 연구는 지식재산도시의 지속가능한 운영 도모를 위해 지식재산도시 조성방안을 제안하는 것을 목적으로 한다. 이를 위해 중국과 일본의 해외사례를 분석하고 시사점을 도출한 뒤 이를 바탕으로 우리나라에 적합한 한국형 지식 재산도시 조성사업의 방향성을 설정하고 효과적인 적용방안을 제시하였다. 뿐만아니라 이전 지자체에서 법적인 근거 없이 지식재산도시를 운영한데 따른 한계를 극복할 수 있도록 한국형 지식재산도시의 조성을 위한 발명진흥법상 법적 근거를 제시하였다. 즉, 지식재산도시의 정의, 지식재산도시 촉진을 위한 정부시책, 지식재산도시 지정을 위한 위원회 구성 및 운영방안, 재정적 지원 등에 대한 규정이 필요함을 살펴보았다. 그리고 이러한 법적 근거와 함께 지식재산이 지역에 정착하여 지역경쟁력을 확보 할 수 한국형 지식재산도시가 성공적으로 정착할 수 있는 방안도 함께 살펴보았다. 첫째, 지자체 주도로 이루어지는 상향식(bottom-up)방식의 거버넌스 체계가 구축되어야 한다. 둘째, 각 도시의 배경·환경 및 도시의 특색을 반영하여 지역의 고유한 지식재산도시를 추진하여야 한다. 셋째, 지식재산도시 지정 후 지식재산권 관리수준 및 능력에 대한 평가를 통한 단계별 사업 운영 방식 도입되어야 한다. 넷째, 다양한 혁신주체들과의 사업연계 및 협력을 추진함으로써 지식재산도시의 가치 효용을 극대화 할 수 있을 것이다. 마지막으로 사업추진을 위해 정부, 기업, 기금 등 다양한 재원을 활용할 필요가 있다. 본 연구 결과가 제시한 지식재산도시 조성방안은 지자체별 차별화된 정책수립과 중앙정부의 지역별 맞춤지원을 통해 성공적인 한국형 지식재산도시 수립에 기여할 것으로 기대된다. This study was conducted to propose a plan for sustainable operation of intellectual property cities. For this purpose, the study analyzed overseas cases of China and Japan and derived the implications to set the direction of the intellectual property city development project suitable for Korea, and suggested effective application plans. In addition, the legal basis was suggested in the Invention Promotion Act for the creation of a Korean version of Intellectual Property City so that the existing local governments could overcome the limitations of operating intellectual property cities without legal grounds. In other words, the necessity of defining the intellectual property city, the government policy for promoting intellectual property city, the composition and operation plan of the committee for designation of intellectual property city, and the regulations on financial support were examined. With the above legal grounds, five ways for the success of the Korean version of intellectual property city, where intellectual property can settle in the region and secure competitiveness, were suggested. First, a bottom-up governance system led by local governments should be established. Second, the local intellectual property city should be promoted by reflecting the background, environment and characteristics of each city. Third, after being designated as an intellectual property city, the operation of the project should be introduced step by step through the evaluation of intellectual property rights management. Fourth, the value and utility of intellectual property city could be maximized by promoting business linkage and cooperation with various innovation subjects. Finally, various resources such as government, enterprises, and funds should be utilized to promote the project. The development plan of intellectual property city suggested by the results of this study is expected to contribute to the successful establishment of Korean version of intellectual property city through differentiated policy establishment by local governments and customized regional support by the central government.

국제물류관리와 전자적물류정보의 경쟁요인에 관한 실증연구

곽현 ( Hyun Kwak ) 한국통상정보학회 2007 통상정보연구 Vol.9 No.2

TGA를 이용한 PET의 열분해와 연소반응 속도론

이동규 ( Dong-gyu Lee ),곽현 ( Hyun Kwak ),오세천 ( Sea-cheon Oh ),배성렬 ( Seong-youl Bae ) 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2

회귀모형을 이용한 한국프로농구 승부결과 분석

장효진(Hyojin Jhang),곽현(Kwak Hyun),최승회(Seung Hoe Choi) 한국지능시스템학회 2015 한국지능시스템학회 학술발표 논문집 Vol.25 No.1

본 연구의 목적은 프로농구 경기의 승부 결과를 회귀모형을 이용하여 분석하는 것이다. 이를 위해 본 연구에서는 전통적인 회귀분석 방법과 문자적인 변수를 사용하는 퍼지회귀모형을 사용하였다. 승부의 결과를 두 팀간의 점수차로 표현하여 분석한 일반회귀분석 방법에서는 두 팀의 점수차에 영향을 미치는 변수를 찾아 승부의 결과에 대한 회귀모형을 제시하였다. 그리고 두 팀의 승부 결과를 “대승, 신승, 박빙, 석패, 그리고 대패”와 같이 문자적으로 표현한 퍼지회귀모형에서는 각 팀의 경기력을 퍼지수로 표현하여 각 팀의 경기력이 승부의 결과에 미치는 영향을 분석하였다. 본 연구는 한국프로농구연맹(KBL, Korea Basketball League)에서 제공하는 2013~2014시즌의 자료와 프로농구의 결과를 분석하는 칼럼들을 이용하여 분석하였다