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나노 입자가 시멘트 모르타르의 파괴인성치에 미치는 영향
최승원,백초원,이선열,뉘엔 반 통,김동주 한국건설순환자원학회 2023 한국건설순환자원학회 논문집 Vol.11 No.4
이 연구는 나노 입자의 혼입이 시멘트 모르타르의 파괴인성치에 미치는 영향을 조사하였다. 탄소나노튜브 (carbon nanotube, CNT), 나노실리카 (nanosilica. NS), 그리고 나노 탄산칼슘 (nano calcium carbonate, NC)가 각각 혼입된 시멘트 모르타르의3점 재하 휨강도, 압축강도, 슬럼프 실험을 수행하였다. 물시멘트비, 잔골재시멘트비가 각각 0.45, 1.5인 모르타르에 19.5 mm 강섬유가 0, 2 vol.% 혼입된 시멘트 모르타르를 사용하였다. 나노 입자 혼입은 시멘트 모르타르의 파괴인성치와 압축강도를 일부 향상시켰다. 그러나 강섬유가 보강된 시멘트 모르타르의 경우 나노 입자 혼입은 모르타르 유동성을 저하하여 강섬유의분산도에 부정적 영향을 초래하여 오히려 파괴인성치를 감소시키는 결과를 확인할 수 있었다. 나노 입자의 혼입으로 인한모르타르의 유동성 저하를 개선할 수 있는 추가적인 연구가 필요하다. This s tudy investigated t he e ffects of n anoparticles o n the fracture t oughness o f cement m ortar. T hree-point b ending tests, compressive tests, and slump tests were conducted on cement mortars reinforced with carbon nanotubes(CNTs), nanosilica(NS), and nano calcium carbonate(NC), respectively. Cement mortar with a water-to-cement ratio and a sand-to-cement ratio of 0.45 and 1.5, respectively, and reinforced with 0 and 2 vol.% of 19.5 mm steel fibers, respectively, was used. Reinforcement with nanoparticles partially improved the fracture toughness and compressive strength of the cement mortar. However, in the case of cement mortar reinforced with steel fibers, the reinforcement with nanoparticles was found to reduce the flowability of the mortar, adversely affecting the dispersion of s teel fibers, a nd u ltimately leading t o a decrease i n fracture t oughness, contrary t o the intended enhancement. Additional research is needed to improve the decrease in mortar fluidity caused by the reinforcement with nanoparticles.
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최승원 光云大學校 1994 인문사회과학논문집 Vol.23 No.-
The Hard Look Doctrine, itself a product of judicial creativity like so much of today's administrative law in America, is one option available to courts in blending broad statutory delegations with the need to structure exercises of administrative discretion. In their efforts to reassert some measure of control over the exercises of administrative discretion under broadly-worded statutory authorizations, the courts have carefully scrutinized agency decisional processes. But, the demand for rationality in administrative decision making, like all other formulas for court review in the modern agency /court partnership, has its limits. In reviewing agency environmental activities, the courts have made a concerned effort to structure their input consistent with an awareness of the essentially secondary role played by courts in environmental decision making. Courts have recognized that many agency judgements such as those founded upon specialized knowledge and experience or experimentation are often entitled to a significant degree of judicial respect. However, neither the text of most environmental statutes or the traditional standards of review have provided the courts with a satisfactory tool for distinguishing between those matters which should be left to agency judgements and those requiring court intervention. Courts have realized that insistence upon normative procedural formalities do not usually offer viable solutions in highly-technical and transitory subjects like environmental law. Now, courts are obliged to face up to the questions of what is the appropriate and coherent judicial posture toward agency decision making.
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최승원 梨花女子大學校 法學硏究所 2003 法學論集 Vol.7 No.2
This Article aims to overview the current statutes and rules relating to the development of IT Hub in China and Taiwan. In consideration of the strength of IT industry of Korea and its international standing, Korea shall be able to function as a hub of East Asian and global IT Industry. It is an essential prerequisite of nationwide hub-development to foster core hubs as strategic posts. The necesssity for establishing IT Hub has been confirmed through the foreign model cases. In the light of development and management of IT hub the existing public policy and legal regulations for industrial district do not provide adequate institutional framework and support for the purpose. There are multiple statutes and administrative regulations which are applicable to the development and management of IT Hub. The major inadequacy of the existing legal regulations comes from the normative conflicts and jurisdictional overlapping among them as well as complicated procedures. So it’s necessary to consider either consolidating the scattered legal regulations into one integrated statute or enacting a separate Act on the Special Cases concerning comprehensive support for IT hub.
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최승원 梨花女子大學校 法學硏究所 2001 法學論集 Vol.6 No.1
In Korea wird der Gegenstand der Anfectungsklage in dem Schrifttum und in der Rechtsprechung sehr beschra"nkt verstanden. Im Vergleich zu Deutschland ist in Korea die Hilfsmittel nach dem Verwaltungsprozeβrecht nicht weiter vielfa"ltig entwickelt. Aus diesem Grund sind die Gegensta"nde der Anfechtungsklage durch Auslegung mo"glichst weit zu verstehen. In der Rechtsprechung und Literatur vertritt die Auffassung, daβ ein betreffende Sachverhalt nur dann ein Gegenstand der Anfechtungsklage werden kann, soweit ihm eine rechtliche Interesse besteht. Begru"ndet ist diese Auffassung, daβ obwohl die Gegensta"nde der Anfechtungsklage weit umfaβend anerkannt sind, kann die Anfechtungsklage in dem Fall zuru"ckgewiesen werden, in dem rechtliche Interesse an dieser Klage vemeint ist. Diese Auffasung ist jedoch nicht zu zustimmen, weil sie oft dazu fu"hren kann, daβ der Sachverhalt, der nach dem Verwaltungsprozeβ erkla"rt werden muβ, entwer durch ein Zivilprozeβ odor durch eine Verfassungsklage ersetze wird. Dies stellt eine Agabe dar, bald zu u"berwinden.
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