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소나 음향창의 설계 인자가 난류 유동 유기 자체 소음의 전달 함수에 미치는 영향 해석
신구균(Ku-kyun Shin),서영수(Youngsoo Seo),강명환(Myengwhan Kang),전재진(Jaejin Jeon) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
Turbulent boundary layer noise is already a significant contributor to sonar self noise. For developing acoustic window of sonar system to reduce self noise, a parametric study of design factors of acoustic window is presented. Distance of sensor array from acoustic window, material and damping layer are studied as design factors to influence in the characteristics of the transfer function of self noise. As the result these design factors make change the characteristics of transfer function slightly. Among design factors the location of sensor array is most important parameter in the self noise reduction.
연구논문 : 지역경제 활성화를 위한 지방은행 역할 강화 방안: 일본의 경우를 참고하여
김국현 ( Ku Kyun Kim ) 전남대학교 지역개발연구소 2012 지역개발연구 Vol.44 No.2
우리나라는 1997년 외환위기 이후 금융구조조정 과정에서 중소기업, 소상공인 및 영세서민에 대한 대출비중이 높은 지역금융기관들이 대거 퇴출되면서 지방중소기업의 자금조달은 더욱 어려운 상황에 처하게 되고, 지방중소기업의 금융접근성 저하는 서울 및 수도권과 지방중소기업간의 격차를 확대시켜 지역경제간의 불균형을 심화시키는 원인이 되고 있다. 본 고에서는 이제 우리나라도 선진국가 대열에 진입을 앞두고 있는 시점에서 지방분권화가 활발히 진행되면 지방에 근거지를 두고 지역경제와 밀착되어 발전하는 지방은행의 역할은 더욱 중요성을 가지게 될 것으로 판단하고, 앞으로 지방은행이 지역민과 지역 중소기업 지원을 위해, 그리고 지역주민의 삶의 질 향상을 위해 없어서는 안될 존재로 자리잡을 수 있도록 일본의 경우를 참고하여 역할 강화 방안을 제시한다. Since the 1997 financial crisis, the local SMEs(small and medium enterprises) were in placed in a difficult situation because the financial institutions, having a high proportion of loans for small businesses, were liquidated in Korea. In this paper, it provides the role of a regional bank in order to become an integral institution for supporting not only a local resident but also local SMEs and improving the quality of citizens life. The reason why this paper providing the role of a regional bank is that the role of a regional bank might be more important because it develops with the regional economy based on the local province in the time of Korea`s stepping to a developed country. Despite the role of the regional finance has to be more important for the regional economy activation, it has contracted rather more shrink since the last foreign currency liquidity crisis. In order to realize the ongoing regional economic development and enable local financial contraction, the regional banks function at its best like developed countries. The suggestions are as follows: First, making a solution to strengthen regional circulation in the area of government funding measures. Second, easing the obligation SME lending rates and improving calculation method. Third, enhancing region-based relationship banking and strengthening financial management support services. Fourth, nurturing SMEs and setting a financial support system by growth phase. Finally, building systems respond the various financial needs of local consumer. Nowadays the competitiveness of the local bank for the local economy and local businesses and residents of the ease of securing financial situation is the most important more than ever.
Long-term clinical outcomes of single short implants in the mandibular molar area
Jeong-Kui Ku(Jeong-Kui Ku),Young-Kyun Kim(Young-Kyun Kim) 대한치과이식임플란트학회 2023 The Korean Academy of Implant Dentistry Vol.42 No.1
Purpose: This retrospective study evaluated a long-term result of single short implants in the mandibular molar area. Materials and Methods: The patients enrolled in this study had received 7- and 8-mm single short implants between November 2005 and February 2014. The clinical results were analyzed according to the length of implants, including survival and success rates and marginal bone loss. The cumulative survival rates were measured using the Kaplan-Meier survival curves, the success rate was analyzed according to the criteria of Albrektsson, and marginal bone loss was evaluated by the paralleling cone technique. Results: Eighty-one implants and patients (58.4±11.5 years) were analyzed. All mesiodistal cantilevers of prosthetics were within 3 mm. Over an average period of 7.0±2.8 years, the marginal bone loss was 0.5±0.8 mm. Failure occurred for three implant complications at 0.3, 1.2, and 10.2 years after the loading, respectively. The other complications occurred on one implant with screw loosening after two years and another implant with peri-implantitis after 2.2 years. On the other hand, the clinical outcomes of the 7 and 8 mm implants were not significantly different, including marginal bone loss (0.5±1.2 and 0.5±0.6 mm), survival rate (93.8±24.6 and 98.0±14.3%), and 10-year cumulative survival rates (96.4±3.5 and 97.6±20.2%). Conclusions: Single short implants of 7 and 8 mm in length showed reliable clinical outcomes in the posterior mandible.