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배합변수에 따른 라텍스 개질 콘크리트 내에 정착된 보강철근의 부식개시시기 예측
박성기,원종필,박찬기,김종옥,Park, Seung-Ki,Won, Jong-Pil,Park, Chan-Gi,Kim, Jong-Ok 한국농공학회 2008 한국농공학회논문집 Vol.50 No.6
This study were predicted the corrosion threshold reached at steel reinforcement in latex modified concrete(LMC) which were applied the agricultural hydraulic concrete structures. Accelerated testing was accomplished to the evaluate the diffusion coefficient of LMC mix, and the time dependent constants of diffusion. Also, the average chloride diffusion coefficient was estimated. From the average chloride ion diffusion coefficient, the time which critical chloride contents at depth of reinforcement steel was estimated. Test results indicated that the corrosion threshold reached at reinforcement in LMC were effected on the mix proportion factor including cement contents, latex content, and water-cement ratio. Especially, the average chloride diffusion coefficient, the corrosion threshold reached at reinforcement in LMC were affected by the all mix proportion factor.
박찬기 ( Chan Ki Park ) 국방대학교 안보문제연구소 2010 국방연구 Vol.53 No.2
본 논문은 오바마 행정부의 대 중동 및 헤즈볼라정책을 분석하고 그 전망을 예측해보는 것이다. 오바마는 외교정책에서 제2차 세계대전이후 미국 외교정책의 근간이었던, 군사적-경제적 우위 점령, 범세계적 정치적-군사적 연대 조성 및 무역-금융 개방정책 주도 등의 전통적인 외교노선을 지양하고 성장하는 국가들의 입장을 이해하고 수용하기 위하여 새로운 외교정책을 입안하였다. 즉, 타 국가와의 관계에서 미국 영향력의 감소를 인정하고 이러한 영향력의 감소를 안정적으로 관리(managed decline)하여 간다는 취지이다. 이러한 외교정책기조는 과거와 같은 영합게임(zero-sum)이 아니라 연성외교를 통해 쌍방이 윈윈(win-win)할 수 있는 다자협력체제를 구축하는 것이다. 그러나 이러한 야심찬 시작과 비교해 본다면 현재까지의 대 중동정책에는 아직까지 획기적인 변화나 결실이 없다. 중동의 가장 큰 문제인 이스라엘-팔레스타인 분쟁에 있어서 2개 국가 원안을 고수하고 있지만 현재까지 큰 진척이 없으며 이란의 핵문제 또한 부시 행정부와 같이 제자리걸음을 하다가 결국은 또 다시 유엔 제재라는 결정을 내렸다. 또한 이라크에서 미군을 철수하는 대신 아프간에 군대를 증파하였지만 그에도 불구하고 탈레반의 영향력과 점령지역은 증가하고만 있다. 또한 오바마 행정부는 대 헤즈볼라정책에 있어서도 큰 변화가 없다. 부시 행정부와 같이 오바마 행정부도 현재까지 헤즈볼라를 국제테러단체로 지명하고 있으며 어떠한 대화의 채널도 가지고 있지 않다. 이러한 상황에서 헤즈볼라, 시리아 및 이란은 3자 회담으로 서로 간의 단합을 과시하며 이스라엘과의 무력충돌 시에는 연합전선을 구사한다는 전략을 발표하였다. 이러한 변화의 부족은 오바마 행정부가 초기에 너무 많은 에너지를 국내의 건강보험 개혁에 소비한 원인도 있지만 더 근본적인 원인은 오바마 행정부가 구사하는 연성외교정책의 한계를 보여주는 것이다. 연성외교는 강력한 군사력과 경제력을 동원하여 피아(彼我)를 구분 짓는 전임 부시 행정부의 강성외교와는 상반된다. 그러나 연성외교정책의 결실을 보기위해서는 많은 시간이 요구되며, 노련한 외교술이 필요하다. 그러므로 그가 임기 중 대 중동정책에서 획기적인 결실을 가지고 오기 위해서는 구성주의적인 접근법을 동원한 스마트파워의 운용이 질실히 요구된다. The main purpose of this paper is to analyze the Obama Administration`s foreign policies on the Middle East and Hezbollah. The traditional U.S. foreign policy guideline since WWII has emphasized the superiority of military and economic power, construction of a worldwide political-military network, trade, and financial liberalization. Obama`s foreign policies, however, differ from these traditional guidelines. Instead, Obama argues that the U.S. should recognize its decline of influence in world affairs and thereby pursue a managed decline. This outlook implies that Obama strives to establish multilateral relations with other countries and applies soft-power foreign policies as a win-win game. In spite of his ambitious foreign policy initiative, there has not been much progress made in the Middle East and Hezbollah. Concerning the conflict between Israel and Palestine, the Obama administration adheres to the original two-state solution but has not made further progress in this area. Additionally, the issue of Iranian uranium enriching has not been resolved, and the Taliban`s influence and territorial control in Afghanistan have increased despite the increased number of U.S. troops in the region. The Obama administration continues to list Hezbollah as a foreign terrorist organization and does not maintain any communications with the group. In the meantime, Iran, Syria, and Hezbollah have formed a tripartite alliance to combat Israeli aggression. How can we explain Obama`s slow progress in foreign policy in the Middle East? Although we can argue that Obama was more focused on domestic issues such as health care reform during his early period of presidency, the main reason for his slow progress is the limitation of his soft-power foreign policies. Soft-power foreign policies differ from hard-power policies, which were well-employed by the Bush administration. Soft-power foreign policy is time-consuming and requires diplomatic skills. To obtain better results in his Middle Eastern and Hezbollah policies in the future, Obama should apply a mixture of soft-power and hard-power diplomacy based on a constructivist approach.
이슬람국가(IS) 현상과 새로운 양상의 국제안보 위협에 관한 연구
박찬기(Park Chan Ki) 한국중동학회 2018 韓國 中東 學會 論叢 Vol.38 No.3
The main purpose of this article is to analyze the foundation of the Islamic State (IS) and its growth after the withdrawal of American troops from Iraq in 2011 and from the Syrian civil war. The article also aims to compare the anti-IS war with the characteristics of the 4th generation war. This study posits that the main reason for the rise of the Islamic State is the Iraqi Shia government s failure to include Sunni people in the nation-building process after the withdrawal of U.S. military forces. The Syrian civil war, which started in 2011, was the main catalyst for the military buildup of the IS both in Syrian and Iraqi territories. Additionally, the failure of major world powers, including the U.S., Russia, and China, to peacefully resolve the Syrian civil war was the main cause for the expansion of IS activities in Syria and Iraq. This paper also found that the strategies and tactics of the IS against the anti-IS coalition group were very similar to the characteristics of the 4th generation war. The 4th generation war, which represents war between the states and non-state actors, is a new phenomenon in the era of globalization. In the 4th generation war, the state is a weaker, not stronger, party. In the 21st century, non-state organizations, such as IS, Al-Qaeda, Hezbollah, and Boko Haram, have become major threats to world peace. The main reason for the proliferation of non-state militant groups is the failure or collapse of the state. As a result, major world powers and international organizations, including the U.S., Russia, China, and the UN, must help weaker states rebuild their abilities in order to neutralize these violent non-state organizations. This will ultimately help achieve world security.
박찬기 ( Park Chan Gi ),원종필 ( Won Jong Pil ) 한국농공학회 2003 韓國農工學會誌 : 전원과 자원 Vol.45 No.2
Over the last decade fiber-reinforced polymer (FRP) reinforcement consisting of glass, carbon, or aramid fibers embedded in a resin such as vinyl ester, epoxy, or polyester has emerged as one of the most promising and affordable solutions to the corrosion problems of steel reinforcement in structural concrete. But reinforcing rebar for concrete made of FRP rebar has linear elastic behavior up to tensile failure. For safety a certain plastic strain and an elongation greater than 3% at maximum load is usually required for steel reinforcement in concrete structures. The same should be required for FRP rebar. Thus, the main object of this study was to develop new type of hybrid FRP rebar Also, this study was evaluated to the mechanical properties of Hybrid FRP rebar. The Manufacture of the hybrid FRP rebar was achieved by pultrusion, and braiding and filament winding techniques. Tensile and interlaminar shear test results of Hybrid FRP rebar can provide its excellent tensile strength-strain behavior and interlaminar stress-strain behavior.