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      • KCI등재후보

        초음파법에 의한 폭발접합 이종금속 접합품질 판정레벨 설정에 관한 연구

        장영권,백영남 대한용접접합학회 2001 대한용접·접합학회지 Vol.19 No.1

        An ultrasonic test method, as a nondestructive test is applied to ensure the clad interface quality assessment. According to the reference codes and standards, not only korea Industrial Standard(KS) but also American Society for Testing and Materials (ASTM) Standard, ultrasonic examination procedures use the pulse-echo, A-scan, back reflection signal drop method and/or side drilled reference hole used to establish the acceptance criteria of clad material test. But the variety of bonding materials and sizes makes it difficult to produce the reference blocks, or thus the criteria. In order to overcome these practical difficulties, new ultrasonic testing criterion is suggested. In this new method, the theoretical interface reflection signal amplitude level is calculated and suggested as an acceptance criteria with the back reflection signal set to 100% FSH(Full Screen Height) which is based on acoustic impedance mismatch at the clad interface for the explosive clad ultrasonic inspection. Applicability of suggested criterion, for the explosive clad Fe-Naval Brass with different bonding quality is confirmed to the pre-existed KS and ASTM specifications and verified by using SEM (Seanning Electron Microscope) micrograph. The results obtained by the suggested method is more conservative than the results according to the KS B 0234 and ASTM A 578 specifications The suggested method could be applicable to any other combination of explosive clad ultrasonic inspection.

      • KCI등재
      • KCI등재

        초음파 C-Scan을 이용한 구조용 세라믹스의 기계적 특성평가

        장영권 韓國非破壞檢査學會 1989 한국비파괴검사학회지 Vol.9 No.2

        Computer-aided high frequency ultrasonic is applied to aluminum oxide(85w%, 94w%, 96w% and 99w%) MOR(modulus of rupture) samples to evaluate mechanical properties such as density variation, pore content, elastic modulus, shear modulus, and poisson's ratio. Ultrasonic wave velocity and attenuation measurement techiniques were used as an evaluator of such properties. Pulse-echo C-Scan images with different gate setting method using 50MHz center frequency 1 inch focal length transducer allows evaluation of density variation and pore content. Elastic modulus calculated with the relation of density and ultrasonic velocity. It shows good reliability as compared with resonance method. Sintered density variation of 0.025g/cm ³, that is 0.6% of theoretical density in Al₂O ₃samples can be observed by ultrasonic velocity mearsurement. Attenuation measurement method qualitatively agree with 4-point fracture testing result concerning of porosity content.

      • KCI등재후보

        DMZ평화 : 의미, 구축 전략, 과제

        장영권 한국통일전략학회 2012 통일전략 Vol.12 No.1

        Until now, a large number of researches and businesses have been attempted about a measure of mutual benefits and common prosperity between South and North Korea that bring peace of DMZ. However, DMZ peace had become a dependent variable of North-South relations and it had not been settled properly or had been destructed in the middle such as the Mt. Geumgang tour business. It is because there was no consideration of a construction strategy about ‘Sustainable Peace’ through ontological approach of DMZ peace. It should be approached through ‘Peace Complexes Theory’ for sustainable peace of DMZ and mutual benefits and common prosperity of Korean peninsula. It means that ontological conditions of sustainable peace are consisted of economic peace, cultural peace, and political-military peace and should build peace gradually and complexly upon these three conditions. That is, North and South must build peace through the gradational and complex construction of economic peace, cultural peace, political-military peace business in DMZ to raise the sustainability of peace. There has been the aftereffect with large portion for 20 years since Germany was unified and it implies its importance of phased unification between South and North Korea rather than radical political and systematical unification. Especially, DMZ Peace Zone construction of a borderland with high military tension like South and North Korea will contribute to building sustainable peace largely. Because South and North Korea should implement these peace conditions in complexes phase and realize ‘peace integration’ between South-North by eliminating a cause of war or violence through DMZ peace and constructing Peace Zone. Furthermore, there is a need to seek various peace settlement ways to establish and expand sustainable peace in DMZ and to realize peace of Korean peninsula regardless of inter-Korean relations. The construction of West-Sea Special Peace and Cooperation Zone agreed before is inevitable even if there will be many complications in the future between South and North Korea. Also the construction of peace cooperation special zone between South and North should be accomplished in case of DMZ. Therefore, we need to recognize the importance of the DMZ Peace Zone construction since it affects the future of Northeast Asia as well as peace of Korean peninsula. It is desirable to construct DMZ as Peace Zone in peace complexes phase for putting forward national unification of South and North Korea and expanding of inner unification. 지금까지 DMZ의 평화를 가져오고 남북한이 상생과 공영을 할 수 있는 방안에 대해 많은 연구와 사업들이 시도되어 왔다. 그러나 DMZ평화는 남북관계의 종속변수가 되어 제대로 정착되지 못했거나 금강산관광처럼 중간에 파기되어 왔다. 이는 DMZ평화에 대한 존재론적 접근을 통해 지속 가능한 평화의 구축 전략을 강구하지 못했기 때문이다. DMZ의 지속 가능한 평화와 한반도의 상생공영을 위해서는 ‘평화복합체론(Peace Complexes Theory)’에 의해 접근되어야 할 것이다. 이는 지속 가능한 평화의 존재론적 조건이 경제평화, 문화평화, 정군평화 등 3가지로 이루어졌으며, 이들 3가지를 단계적, 복합체적으로 평화를 구축해 나가야 함을 의미한다. 즉, DMZ에서 남과 북이 경제평화-문화평화-정군평화 사업을 단계적, 복합체적 건설을 통해 평화를 구축해야 평화의 지속 가능성을 높여준다. 독일이 통일된 이후 20여년이 지났지만 아직도 그 후유증이 큰 것은 급격한 정치적, 제도적 통일보다는 단계적 국가통합이 중요함을 시사하고 있다. 특히 남한과 북한처럼 군사적 긴장이 높은 접경지역의 DMZ 평화지대 건설은 지속 가능한 평화 구축에 크게 기여할 것이다. 왜냐하면 남한과 북한은 DMZ평화를 통해 전쟁 또는 폭력의 원인을 제거하고 평화지대를 건설하여 평화의 조건들을 복합체적으로 이행하여 남북 간 ‘평화통합(peace integration)’을 실현해 나가야 하기 때문이다. 나아가 남북관계와 무관하게 DMZ에서 지속 가능한 평화를 구축하고 이를 확대하여 한반도의 평화를 실현하기 위해서는 다양한 평화 정착 방안을 모색할 필요가 있다. 남과 북은 향후에도 우여곡절이 있겠지만 기존에 합의한 서해평화특별협력지대의 조성이 불가피하다. 또한 DMZ의 경우에도 남북 평화협력특별지대의 건설이 반드시 이루어져야 할 것이다. 따라서 DMZ 평화지대의 건설은 한반도 평화는 물론 동북아의 미래와도 직결되는 중요한 문제라는 점을 인식해야 할 것이다. 남북 간의 국가통합을 앞당기고 내적 통일을 확대하기 위해서는 DMZ를 평화복합체적 평화지대로 건설해 나가는 바람직하다.

      • 超音波 C-Scan을 利用한 構造用 세라믹스의 機械的 特性評價

        장영권,백영남 慶熙大學校 材料科學技術硏究所 1989 材料科學技術硏究論集 Vol.2 No.-

        Computer - aided high frequency ultrasonic is applied to aluminum oxide (85w%, 94w%, 96w% and 99w%) MOR (modulus of rupture) samples to evaluate mechanical properties such as density variation, pore content, plastic modulus, shear moudlus and poisson's ratio. Ultrasonic wave velocity and attenuation measurement techniques were used as an evaluator of such properties. Pulse-echo C-Scan images with different gate setting method using 50㎒ center frequency one inch focal length transducer allows evaluation of density variation and pore content. Elastic modulus calculated with the relation of density and ultrasonic velocity. It shows better reliability as compares with resonance method. Sintered density variation of 0.025g/㎤, that is 0.6% of theoretical density in Al_(2)O_(3) samples can be observed by ultrasonic velocity measurement. Attenuation measurement method qualitatively agree with 4-point fracture testing result concerning of porosity content.

      • KCI등재

        남한과 북한의 평화통합을 위한 교류협력에 관한 연구

        장영권(Young Kwon Jang) 한국사회정책학회 2005 한국사회정책 Vol.12 No.1

        본 논문은 남한과 북한의 교류와 협력은 전쟁방지와 남한과 북한의 평화통합에 있다고 보고, 지속 가능한 평화의 실현이라는 시각에서 접근하여 집필되었다. 한반도의 전쟁방지와 남한과 북한의 통합을 통한 지속 가능한 평화를 구축하기 위한 평화의 개념을 재정의할 필요가 있다. 즉, 평화의 개념을 단일한 의미가 아닌 `복합체적` 의미로 고찰해야 한다. 복합체적 의미의 평화란 `인권·자유·정의와 같은 원리에 따라 개인의 삶의 질이 보장되고 인류공동체의 공동번영을 위하여 국가간에 경제적 이익과 문화적 가치 추구에 따른 갈등, 정치적 주권침해와 군사적 위협, 착취와 이를 위한 폭력(전쟁)이 없는 상태`이다. 따라서 지속 가능한 평화는 정치군사평화, 경제평화, 문화평화가 조화를 이룬 상태이고, 이러한 평화를 추진해가는 지역내 국가군을 이루는 복합체적 집성체 또는 복합체적 동학을 특히 `평화복합체(peace complexes)`라고 한다. 한반도 지역의 평화복합체에 속한 남한과 북한의 정치군사평화, 경제평화, 문화평화의 확대를 위한 교류협력은 남한과 북한의 평화통합을 촉진시켜 한반도 긴장완화와 평화안정, 나아가 동북아시아 지역의 안정과 복지번영공동체 구상 실현에도 크게 기여한다. 그러므로, 남한과 북한의 평화통합을 위해서는 정치·군사적, 경제적, 문화적 평화확대를 위한 측면에서 교류협력을 강화해야 한다. 평화의 조건인 정치군사평화, 경제평화, 문화평화에 있어서 우선순위는 경제평화, 문화평화, 정치군사평화라고 할 수 있지만 동시에 평화복합체적으로 추진해야 효과를 극대화할 수 있다. 따라서 지속 가능한 남북평화를 구축하기 위해서는 교류협력을 통해 상호 인정과 존중이라는 평화공존 의식을 갖고 공동번영을 할 수 있는 평화복합체적 평화공동체를 지향해야 한다. This thesis discusses Korea the realization of sustainable peace and is written from the point of view that interchange and cooperation between South Korea and North Korea would prevent the war and promote Peaceful Integration. It is needed to redefine the concept of peace constructing sustainable peace through South-North integration and war prevention in Korea Peninsula. That is, the concept of peace should be considered as complexes meanings instead of simple meaning. Peace complexes means that `Individual`s quality of life is secured according to principle such as human rights, freedom and justice, and for common prosperity of mankind community between the countries` economic profit and conflict by cultural value pursuit, political infringement of sovereignty and military threats, exploitation and no violence status`. Peace Complexes concept means that sustainable peace is possible when 3 complexes conditions (paths) of peace, which are, politic-military condition, economic condition, and cultural condition are accomplished. That is, conditions of peace by concept of sustainable peace are typified by politic-military peace, economy peace and culture peace. Therefore, sustainable peace is state that harmonizes politic-military peace, economic peace and cultural peace accomplish creation, and complex conglomerate or complex dynamic study which forms a belt of countries in the area by propelling this peace is called especially `Peace complexes`. The Peace complexes Theory has a proposition that Peace is materialized through inter-countries complexes paths (conditions), and is also Peace Integration Theory which shows that the most proper scale is regional level and complexes area on its theoretical basis. Inter-Korean cooperation for extension of politic-military peace, economy and culture peace of South and North Korea belonging to peace complexes of Korea Peninsula area, promotes peace integration of South Korea and North Korea, furthermore, contributes greatly for Korea Peninsula detente, Northeast Asia area stability and realization of welfare prosperity community. Therefore, to achieve peaceful integration between South and North Korea it should strengthen inter-Korean cooperation with a view to keeping political-military, economical, cultural peace extension. Priority can be given economic peace, culture peace, politic-military peace among in politic-military peace, economic peace, cultural peace that is 3 conditions of peace, however, it can maximize effect when we pursuit by means of peace complexes. at the same time. And it can be said that the most important thing is cultural peace for the sake of South and North Korea`s peace integration. If this is not attained properly, structure of peace integration would be vulnerable. Because and this nitrification of ideology and value can threaten politic-military peace and finally harm economic peace. Therefore, it should intend toward peaceful peace complexes community with peaceful coexistence consciousness which is mutual respect and recognition making common prosperity in order to construct sustainable South-North peace.

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