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선박용 고강도 Al합금(5456-H116)의 최적 방식 전위결정에 관한 연구
김성종,고재용,Kim Sung-Jong,Ko Jae-Yong 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
Recently, interest in using Al alloys in ship construction instead of fiber-reinforced plastic (FRP) has increased because of the advantages of A) alloy ships over FRP ships, including high speed, increased load capacity. and ease of recycling. This paper investigated the mechanical and electrochemical properties of Al alloys in a slow strain rate test under various potential conditions. These results will provide reference data for ship design by determining the optimum protection potential regarding hydrogen embrittlement and stress corrosion cracking. In general, Al and Al alloys do not corrode on formation of a film that has resistance to corrosion in neutral solutions. In seawater, however, $Cl^-$ ions lead to the formation and destruction of a Passive film. In a potentiostatic experiment. the current density after 1200 sec in the Potential range of $-0.68\~-1.5\;V$ was low. This low current density indicates the protection potential range. Elongation at an applied potential of 0 V was high in this SSRT. However, corrosion protection under these conditions is impossible because the mechanical properties are worse owing to decreased strength resulting from the active dissolution reaction in parallel parts of the specimen. A film composed of $CaCO_3\;and\;Mg(OH)_2$ confers corrosion resistance. However, at potentials below -1.6 V forms non-uniform electrodeposition coating, since there is too little time to form a coating. Therefore, we concluded that the mechanical properties are poor because the effect of hydrogen gas generation exceeds that of electrodeposition. Comparison of the maximum tensile strength, elongation, and time to fracture indicated that the optimum protection potential range was from -1.45 to -0.9 V (SSCE).
김성종(Sung-Jong Kim) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.2
본 연구는 탈북자 정착지원 협력적 거버넌스 구축을 위한 참여주체인 중앙정부, 지방자치단체, 민간단체의 구체적 역할을 논의하기 위해 수행되었다. 중앙정부는 현재 통일부, 행정안전부, 고용노동부, 교육과학기술부, 보건복지부 등 다양한 차원에서 수행되고 있는 기능에 대한 정책조정 기능이 취약하므로 총괄 부서를 지명하고 정책기획, 예산확보 및 배정, 사후평가 및 책임성확보를 담당해야 한다. 지방자치단체는 실질적 서비스를 전달하기 위한 네트워크를 구축하고 관리하는 기능을 담당하기 위해서 의사소통 체널을 확보하고 관계망을 형성하며 다양한 주체들의 집행업무를 조정하는 역할을 담당해야 한다. 민간단체는 전문성을 바탕으로 서비스 개발하고 지역의 자원을 발굴하며 밀착서비스 제공하는 것이 바람직할 것이다. This study was conducted to establish collaborative governance for North Korean Refugees’ settlement support service. Three major actors were identified. At the central government level, there is no control center to coordinate various functions. This study suggested three roles for central government in collborative governance, which are policy planning based on public value, allocating financial resources to implementing organizations, and program evaluation for securing public accountability. The rloes of local government are establishing communication channels between implementing participants, maintenancing good relations, and coordination. Finally, the role of private actors is developing high quality service programs, connecting local resources for settlement service.
단상 DC/AC 인버터 시스템의 부하변동을 고려한 외란 관측기 기반 제어기
김성종(Sung-Jong Kim),손영익(Young-Ik Son),정유석(Yu-Seok Jeong) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4
Output voltage waves of a DC/AC inverter system are likely to be distorted if variable loads e.g. motors or rectifiers exist in the output terminal. This paper designs a disturbance observer-based PI controller for a single-phase inverter system that is robust against load changes. In this paper, we regard the output voltage changes due to various loads as disturbances of the control system. Then we design a disturbance observer for estimation of the disturbances caused by the load current and any other error sources (such as parameter uncertainties and model mismatches etc.). In order to test the performance of the proposed control law, simulation studies are carried out for a single-phase inverter system using SimPowerSystems of Matlab Simulink. Compared to a simple PI control. the disturbance observer-based controller shows enhanced performance in transient responses for step load changes.
김성종(Sung-Jong Kim) 한국콘텐츠학회 2014 한국콘텐츠학회논문지 Vol.14 No.11
본 연구는 지방공무원들의 셀프리더십이 직무만족과 고객지향성에 미치는 영향을 경험적으로 파악하여 정책적 시사점을 도출할 목적으로 수행되었다. 그동안 행정서비스를 국민의 필요와 욕구에 맞춰 제공하기 위한 다양한 제도적 방법이 도입되어 왔지만 만족할 만한 얻지 못했다. 제도적 접근만으로는 관료들이 직무수행 행태를 고객지향적 행동으로 바꾸는데 한계가 있기 때문이다. 오랜 공무원들의 서비스 공급자 중심의 역할인식과 직무수행방식을 수요자 중심으로 바뀌는 데는 많은 시간이 필요한 것이다. 셀프리더십은 조직구성원의 자발적이고 능동적 행동을 통한 내적에너지를 업무수행에 활용하는 능력으로 조직목표달성에 긍정적 영향을 미치는 요인이다. 본 연구의 분석 결과 셀프리더십이 공무원의 고객지향성에 긍정적으로 영향을 미치는 것으로 확인되었으며 직무만족도가 매개적 역할을 수행하고 있음도 제시하였다. 행정서비스의 고객지향성을 강화하기 위해서는 제도적 통제를 받지 않아도 자기 스스로 자신의 태도와 행동을 긍정적 방향으로 바꿀 수 있도록 셀프리더십을 향상시키는 정책적 접근을 제안하였다. Main purpose of this study is to investigate the effect of the self-leadership of local public officials on the customer-oriented public service provision. Structural Equation Model was applied to analyze the relationship between self leadership and customer oriented public service attitude. Positive structural relationships between self-leadership and customer-oriented attitude was confirmed from empirical analysis. While variable job-satisfaction took intermediating role between self-leadership and customer-oriented attitude. The result implies that behavioral approach might be a more effective policy measure to improve citizen’s satisfaction for public services. For a extended periods, Korean government introduced various institutional arrangements to improve the customer satisfaction for public service. Hoever, the result was not satisfactory. The result of this study suggest behavioral approach to improve public service customer satisfaction.