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      • LiNbO₃ 단결정 표면의 Chemical Etching에 관한 연구

        진광수,김정남,이재현 부산대학교 물성연구소 1984 물성연구소연구논문집 Vol.3 No.-

        LiNbO₃단결정의 X, Y, Z _ 면상에 chemical etching을 하여 여러가지 etch pit와 hillock pattern을 얻었다. 본 실험에서 사용한 etchant는 이미 알려진 HF, HNO₃를 모체로 하여 CH₃COOH, KBr, Li₂CO₃, Nb₂O_(5) 그리고 H₂SO_(6)중에서 한가지 또는 두가지를 첨가한 것을 사용함으로써 선명한 etch pattern을 얻었다. 그리고 이결정의 각 면에 생긴 etch pattern들을 좌표측에 따라 입체적으로 그려서 정리하고, ion배열을 조사하였다. The etch pits and hillocks are produced on the different crystallographic planes in LiNbO₃single crystal by the chemical etching. Various new compositions of CH₃COOH, KBr, Li₂CO₃, Nb₂O_(5) and H₂SO₄are tried to find the reliable etchant for X, Y, and Z-planes of LiNbO₃single crystals. Furthermore the relationship of ethcing morphology with the ionic arrangement on each crystallographic plane are discussed.

      • KCI등재

        치과교정용 NiTi 합금계 선재의 탄성과 상변태 거동에 대한 열처리 효과

        이진숙,김광만,김경남 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1

        Due to unique property of superelasticity, NiTi has been used widely since their introduction to the orthodontic specialty by Andreasen and Hillmann. But sufficent evaluation of superelasticity of domestic marketed wires has not yet been made. It has been known that heat treatment caused changes not only of elastic behavior but also of phase transformation behavior, an important factor of superelasticity. So, this study was investigated into varied ways of heat treatment of wires for orthodontic force proper for each clinical case. Each elastic behavior of 6 commercial NiTi alloy orthodontic arch wires(LG's ORTHOLLOY, G & H's Nickel Titanium arch wire, ORMCO's NI-TI and COPPER NI-TI, TOMY's SENTALLOY and 3M Unitek's Nitinol) were examined, and in order to study the effect of heat treatment on elasticity and phase transformation behavior, 3-point bending test, differential scanning calorimetry and X-ray diffraction with each wire heated at 350℃, 450℃ and 550℃ for 1hour were carried out compared with a as-recieved group. The results were as follows : 1. As a result of 3-point bending test in a control group, all wires had superelasticity and COPPER NI-TI showed the lowest maximum load as well as minimum(P<0.05). 2. As a result of 3-point bending est, except Nitinol and COPPER NI-TI, the wires in the group heated at 450℃ had lowest maximum and minimum load than that of a control group, and higher maximum and minimum load that of COPPER NI-TI in control group, and had superelasticity without and permanent deformation(P<0.05). 3. Phase transition temperature of all wires heated at 350℃ except COPPER NI-TI became higher but it became lower when they were heated at 450℃ and 550℃. 4. All wires in control group had austenite structure and when they were heated, martensite phase increased, and R phase appeared when heated at 550℃. The wires used in this study were changed in phase transition temperature, structure and elastic behavior as well by heat treatment. So this study showed that even the same kind of wire could be varied and used after heat treated, choosing proper load in accordance with each orthodontic clinic case.

      • 社會變動에 관한 理論的 考察

        李振馥 건국대학교 1982 論文集 Vol.14 No.1

        This thesis is considered social change theories on the side of epitemology. There are generally three social change models : evolutional, functional, and conflict theory. 1.Evolutional model; The concept of development is often implicitly and perhaps intentionally normative. It also tends to suggest a single, final state of affairs-a deterministic, unilinear theory of social evolution. 2.Functional model; In this theory, it is assumed the systematic survial and equilibrium in society. So this theory is inappropriate to explain the social change and development. 3.Conflict model; There are always various conflicts in society. And those conflicts regarded as the affirmative factors of social change and development. Finally, it is considered the fourth dimentional time-space model, upon which the dynamics of time is emphasized in the interrelationships of the generality and the speciality. It is asserted that the accelerators for the political development are the political leadership, the vitality of political process, the identification with the political system, and the administrative efficiency.

      • 韓國立法府의 行政統制의 限界에 關한 硏究 : 重石弗事件에 따른 國務院 不信任 決議案의 事例

        李振馥 건국대학교 1984 論文集 Vol.19 No.1

        Ⅰ. Introduction The executive power has been strengthened even the extent to which it invades the legislative roles in recent years. This emphasizes on the administrative responsibility and legislative control on the excutive. Ⅱ. Legislative Control over the Executive. The legislative power and functions in mass democracy are different from them in modern democracy. This doesnt' mean the denial of democracy hut the self-preservation of democracy. So the executive should be responsible for his actions and effectively be controlled by legislative. Ⅲ. The Background and Contents of lung-Suck BUL (Dollars from exhorted Tungsten) Affair Rhee regime, in order to survive his power, founded the Liberty Party (Ja-Yoo Dang) and passed the selected amendment bill to Constitution under declaring martial law in 1952. Furthermore, Rhee regime transfered to some trading companys rung-Suck BUL and granted them the privilege to import cereals and fertilizer. This fact shoved that Jung-Suck BUL affair resulted from the process of assuring the political funds to found the Liberty party and to reelect Rhee president. The lung-Suck BUL affair had a serious influence on the general public and caused social disorder. Ⅳ. The Deliberative Process of the National Assembly about Non-Confidence Resolution to the Government (Cabinet) The National Assembly proposed non-confidence resolution to government, for the illegal actions and failure of the government raised the Jung-Suck BUL affair. But this resolution was rejected by 35 to 128. Eventually, the National Assembly played a role only as a maid of the Executive Ⅴ. Conclusion The great financial affair and the failure of the government as the Jung-Suck BUL affair will often occur in the developing countries. Particularly, this affair happens when new-regime comes to power by the physical power.

      • 違憲的 緊急措置에 대한 議會統制의 限界에 關한 硏究 : 2.14 緊急通貨 措置 承認案의 事例

        李振馥 건국대학교 1985 論文集 Vol.20 No.1

        Ⅰ. Introduction The executive power has been strengthened even the extent to which it invades the legislative roles in recent years. This empharizes on the administrative responsibility and legislative control on the executive. Ⅱ. Legislative Control over the Executive The legislative power and functions in mass democracy are different from them in modern democracy. This doesn't mean the denial of democracy but the self-preservation of democracy. So the executive should be responsible for his actions and effectively be controlled by legislative. Ⅲ. The Background and Contents of 2.14 Monetary Emergency Order. Rhee regime, in order to survive his polder, founded the Liberty Party (Ja-Yoo Dang) and passed the selected amendment bill to constitution declaring martial law in 1952 (5.26 political upheaval). Furthermore, Rhee regime transfered to some trading Companys Jung-Suck Bul (Doillars from exported Tungsten) and granted them the privilege to import cereals and bertilizer. Jung-Suck Bul affair resulted from the process of assuring the political funds to found the Liberty party and reelect Rhee president. So an amount of foreign exchange holding was exhausted and the aggravation of inflation was deepened through 5.26 political upheaval and 8.5 presidential election. 2.14 monetary emergency order was measured to surmount this economical crisis. But 2.14 Monetary Emergency order had a serious influence on the general public and caused social order. Ⅳ. The Deliberative Process of the National Assembly about 2.14 Monetary Emergency Order. The recognition of the 2.14 Monetary Emergency Order(2. 14 monetary reform) was presented on Feb. 17th in 1953. The 2.14 Monetary Reform was the Violation of the Constitution in respect that it had measured during the Assembly session. But the National Assembly passed this order by 113 to 42. Eventually, the National Assembly recognized the unconstitutional measure and played a role only as a maid of the executive. This fact showed that the deliberative process of the National Assembly had tended to be poor because of the non-establishment of the political process. Ⅴ. Conclusion 2. 14 Monetary Emergency Order was measured to surmount the economical crisis as a result of Jung-Suck Bul and the aftermaths of 8.5 Election. But it was the unconstitutional order. A series of these great financial affairs and the failure of the government will often occur in the developing countries. Particularly, this affair happens when new-regime comes to power by the physical power.

      • 第11代 國會議員의 充員에 관한 政治變動論的 硏究

        李振馥 건국대학교 1983 論文集 Vol.16 No.1

        Ⅰ.This thesis aims at examining the patterns of the political elite (the11th National Assembly) recruitment in Korea in view of political change. It is very significant to study of groups form the political elite, what kind of recruitment they have, and what influences they have on the national development in the radically changing soicety. Ⅱ.The social change and the political system from 10ㆍ26 to the beginning of the Fifth Republic are studied. Since the political change was very raidical, the capability of the political system which was managed on the value-oriented side wart needed. The reason is that the management style on the political change is either too authoritative of physical power or too lassez-faire. Ⅲ.It is considered the general election conditions of the 11th National Assembly. 1.To make analyses of the voting rate. 2.To make analyses of the polling score rate of each party. 3.The voting inclination of the electorate. 4.The mechanism of the election system. Ⅳ.The social backgrounds of the political elite are analysed. The number of the elite is 276 Representatives of the 11th National Assembly. It is found that political elite of the 11th National Assembly consist of "New and Old generations", show a higher educational background, and predominantly recruited from New professional politicians who had teen military and social leaders. Ⅴ.The actual conditions of the 11th National Assembly's selection is considered. And the ratio of winning members of each party is noted. Specially, the election system is emphasized. And the opposition of South and North tab teen deeply influenced on the political system. Ⅵ.Finally, it is pointed that those questions of the Representatives recruitment of the 11th National Assembly, anti asserted that through the institutionalization of the systems of political parites, improvement of the elections system, and the vitality of political process, the acceleration for the political development must be accomplished.

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