지역 연구 공용장비 운영체계 개선을 위한 특성 분류 연구

홍재근(Jaekeun Hong),정선양(Sunyang Chung) 한국기술혁신학회 2011 기술혁신학회지 Vol.14 No.1

본 연구는 지역 소재 과학기술 연구 공용장비에 대한 중복투자 방지와 산학연 협력 활성화를 통한 지역내 R&D 효율성을 증진을 위해서 지역 연구 공용장비 운영체계의 특성 도출을 목적으로 하였다. 이를 위해 기술하부구조정책 및 지역혁신체제의 관점에서 R&D투자와 R&D활동이 상대적으로 활발한 경기도 지역의 사례를 분석하였다. 본 연구는 개별사례분석과 교차사례분석의 2단계 프로세스로 수행된다. 우선, 경기도 소재 주요 R&D 기관별 공용장비의 구축?활용 사례 조사와 운영 관련자 인터뷰를 통해 공용장비 운영 특성을 조사하였다. 다음 단계에서는 전(前) 단계에서 조사된 특성들을 공용장비의 운영주체의 조직거버넌스 특성에 따른 3가지 분류와 4가지 이슈를 매트릭스 방식으로 범주화하여 지자체 차원의 정책적 접근이 가능하도록 이슈를 정리하였다. 교차사례분석에 따라 각 운영체계별로 도출된 주요 이슈는 ① 지자체 주도 운영체계의 경우 ‘공용장비 사용 수수료 체계’ 및 ‘공용장비 운용의성과 지표 정립 및 성과 측정 방법’, ② 국가/지자체/공공연구기관 등 공동 운영체계의 경우 ‘공용장비 운용 성과’ 및 ‘사업부별 공용장비 회계시스템 구축’, ‘예산 지원방식 변경’, ③ 대학 운영체계의 경우 ‘사업종료 후 지속적 공동활용 촉진 방안’ 등으로 나타났다. This study aims to draw the characteristics of the regional operation system of the shared research instrument service, which contributes to the R&D investment efficiency by the avoidance of duplicated research instrument investment and the enhancement of the network collaboration. So from the perspective of technology infrastructure policy and regional innovation system, Gyeonggi region of Korean metropolitan area has been analyzed for the case study. The case study has been conducted by 2 step process of within-case analysis and cross-case analysis. Firstly, the characteristics of operation system of the shared research instrument have been examined through various research methods. Secondly, in the cross-case analysis, the examined issues and problems have been organized by the matrix of 3 organizational governance characteristics and 4 issues to facilitate the regional policy approach. The issues deducted by the cross-case analysis have been deducted as ① ‘usage fee charge system’, ‘relevant method for the performance index and measurement of the instrument service management’ for the regional policy led case, ② ‘performance management issue’, ‘financial and managerial accounting system for the instrument operating division’, and ‘change of budget support scheme’ for the joint operation case and lastly ③ ‘usage facilitation after the expiration of research lab support project’ for the university led case.

SA516 충격시험편의 용접열영향부 노치위치 수치해석 연구

장윤찬(Yunchan Jang),홍재근(Jaekeun Hong),박지홍(Jihong Park),김동욱(Dongwook Kim),이영석(Youngseog Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10

Experimental and numerical studies were performed to examine the effects of notch position on the failure behavior and energy absorption when the Charpy V-notch impact test is made at 1℃. For this purpose, carbon steel plate (SA-516 Gr. 70) with thickness of 25mm usually used for pressure vessel was welded by SMAW (Shielded Metal-Arc Welding) method and specimens were fabricated from the welded plate. The Charpy impact tests were then performed with specimens having different notch positions varying within HAZ. A series of three-dimensional FE analysis which simulates the Charpy test and crack propagation are carried out as well to examine the reproducibility of test results. The FE analysis takes into account the heterogeneous mechanical properties with complex microstructures in HAZ. Results reveal that the absorbed energies during impact test depend significantly on the notch position.

용접열영향부 충격시험편 노치 위치에 따른 파괴거동

장윤찬(Yunchan Jang),홍재근(Jaekeun Hong),박지홍(Jihong Park),김동욱(Dongwook Kim),이영석(Youngseog Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5

Numerical studies were performed to examine the effects of notch location of impact specimens on the failure behavior of HAZ (heat affected zone) when Charpy V-notch impact test were made at a low temperature (1℃). Carbon steel plate (SA-516 Gr. 70) with thickness of 25㎜ for pressure vessel was welded by SMAW (shielded metal-arc welding) and specimens were fabricated from the welded plate. Charpy tests were then performed with specimens having different notch positions of specimens varying from the fusion line through HAZ to base metal. A series of finite element analysis which simulates the Charpy test and crack propagation initiating at the tip of V-notch was carried out as well. The finite element analysis takes into account the irregular fusion line and non-homogenous material properties due to the notch location of the specimen in HAZ. Results reveals that the energies absorbed during impact test depend significantly on the notch location and direction of specimen. Finite element analysis also demonstrates that the notch location of specimens, to a great extent, influences the reliability and consistency of the test.

가스텅스텐 아크용접용 타이타늄합금 플럭스-메탈 코어드 와이어 제조기술

최성우(Seong-Woo Choi),홍재근(JaeKeun Hong),박찬희(Chan Hee Park),이상원(Sangwon Lee),강남현(Namhyun Kang),최윤석(Yoon Suk Choi),박지태(Ji Tae Park),안순태(Soon Tae Ahn),염종택(Jong-Taek Yeom) 대한용접·접합학회 2019 대한용접·접합학회지 Vol.37 No.3

At present, flux or metal cored wires are widely used in iron-based materials for flux cored arc welding in order to reduce the cost of welding production. However, the development of flux or metal cored wire for titanium materials, which are widely used in the petrochemical, power plant and marine vessel fields, has not been done yet, and development is required. In this study, manufacturing process of titanium alloys flux-metal cored wire for gas tungsten arc welding was investigated by FEM simulation and experimental analysis. FEM simulation of tube welding process was carried out with initial three preform-types (butt tube, overlap tube and welded tube). In the FEM simulation results, tube welding process using initial welded tube was evaluated to cause cracking of the specimen during the process. In actual making process of titanium alloys flux-metal cored wire for gas tungsten arc welding, overlap-type tube was evaluated to be the most suitable initial preform shape. In addition, it was confirmed that the filling ratio of the flux-metal was maintained uniformly at over 70%.

공적보증의 효과성과 시장기반 금융제도와의 공존

노용환 ( Yong-hwan Noh ),홍재근 ( Jaekeun Hong ) 한국중소기업학회 2016 기업가정신과 벤처연구 Vol.19 No.3

한국 정부는 효과적인 경기대응 수단으로 공적보증을 이용해 왔다. 그러나 공적보증과 같은 중소기업에 대한 정책금융의 효과성에 대해서는 아직 논란이 해소되지 않았다. 비판적인 견지에서 보면 정책금융이 오히려 중소기업의 정부에 대한 의존도만 증가시켜기업 스스로의 경쟁과 혁신을 방해하고 한계기업의 퇴출을 지연시킨다는 논리이다. 따라서 이 논문은 공적보증시스템의 운영은 어떻게 자리 잡아야 하며, 동시에 시장기반 중소기업금융시스템과 어떻게 공존해 나가야 하는지에 대해 구체적 의견을 제시하고 있다. 첫째, 공적보증은 민간금융시장의 경기 순응적 행태가 초래하는 시장실패를 보완하기 위한 경기대응수단으로 이용되어야 하며, 정부, 국회, 납세자를 포함하는 이해관계자들과 이에 대한 인식을 공유해야 한다. 공적보증기관의 목적은 이윤추구가 아니라 성장가능성이 높은 중소기업을 선별하여 지원하는 공공성의 확보에 있음을 명확히 할 필요가 있다. 둘째, 공적보증은 자금을 필요로 하는 중소기업에게 직접적으로 유동성을 공급해줌으로써 단기간에 경기를 회복시킬 수 있는 대증적 처방이라는 점에서 한국은행의 이자율정책의 효과가 낮을 때 사용할 수 있는 중요한 정책대안이다. 특히 공적보증은 자본금에 근거한 운용배수 범위 내에서 공급이 이루어지므로 정부재정 정책 시 우려되는 재정적자의 위험으로부터 상대적으로 자유롭다는 장점을 지닌다. 셋째, 공적보증의 존재는 창업기업, 성장기업, 생산성 향상, 수출향상, 장기시설투자, 고용창출 사업, 그리고 혁신기업지원과 같이 민간은행으로부터 기대하기 어려운 서비스의 제공에서 찾아야 한다. Korean government had used public ‘credit guarantee schemes’ (CGS) as a counter-cyclical measure. However, it is still controversial about the effectiveness of policy financing on the SMEs. Criticism on policy financing involves the argument that supporting enterprises hampers competition and innovation of SMEs by increasing their dependence on the government and delays the exit of marginal firms. In this paper, we investigate how to effectively build up the rationale of running public CGSs. At the same time, we propose the ways to coexist of public credit guarantee and market-based private finance system for SMEs. First, CGS, as a counter-cyclical function, must coexist with the private financial system by compensating the market failure caused by pro-cyclical behavior of the private financial market. Second, CGS has the comparative advantages, compared to both the interest rate policy of the central bank and fiscal policy of the government. The credit guarantee is the symptomatic treatment that could revitalize the economy shortly by providing liquidity. Also, knowing that CGS is provided based on the leverage ratio defined by outstanding guarantee divided by capital fund, public ‘credit guarantee’ (CG) has an advantage that is free from the risk of government deficit. Third, the reason for existence of the CGS should be founded in supporting services for SMEs, available only in a public sector that is difficult to expect from private banks. In this regard, it is desirable to strengthen the publicness of credit guarantee over the support for start-ups, growing companies, the improvement of productivity, increase of exports, a long-term investment in facilities, the employment-creating businesses, and innovative enterprises.

On the Microstructure evolution of FSW lap joint of cryogenic rolled UFG CP-Ti

Jae-Deuk Kim(김재득),Ji-Ung Kim(김지웅),Yutaka S. Sato,Jaekeun Hong(홍재근),Sung-Wook Kim(김성욱),Yeong-Do Park(박영도) 대한용접·접합학회 2018 대한용접학회 특별강연 및 학술발표대회 개요집 Vol.2018 No.11

용접 후열처리에 따른 Ti-6Al-4V 합금의 레이저 용접부 미세조직과 인장특성

변율(Yool Byun),이상원(Sangwon Lee),박찬희(Chanhee Park),염종택(Jongtaek Yeom),강남현(Namhyun Kang),홍재근(JaeKeun Hong) 대한용접·접합학회 2017 대한용접·접합학회지 Vol.35 No.4

The annealing condition dependence on the weldability of Ti-6Al-4V ELI alloy was studied by means of the tensile test, hardness and microstructure analysis. The Ti-6Al-4V ELI plate with 1 mm plates were joined by the fiber laser welding under 2 kw laser power and 100 mm/s welding speed condition. Various PWHT (Postweld heat treatment) conditions were used to improve the formability of the welded titanium alloy. The results showed the solution treatment for the PWHT contributes on the homogeneous strength distribution from fusion zone to base material. This PWHT conditions were expected to minimize the degradation of the formability caused by the welding.