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.

政策論의 東洋學的 認識方法의 사례 : 皇極易의 구성과 활용을 중심으로

이진복 건국대학교 사회정책연구소 2003 사회과학연구 Vol.16 No.-

집적회로 설계적 기법을 이용한 고전압 인버터 설계

양진모,심용석 대구대학교 과학기술연구소 1997 科學技術硏究 Vol.4 No.3

As the size of MOSFET becomes small due to recent advancements in integrated circuit fabrication technology, operating voltage goes low, typically 3.3∼5[V], by the limitation of semiconductor physics. However, high output-voltage is needed in several applications such as LCD of notebook computers, automobiles, communication systems, CD-ROM drivers, and medical instruments. There are several methods to obtain high-voltage integrated circuits. One is using a high voltage fabrication process and another is using a modified low voltage process which supports high voltage MOSFETs obtained by changing the geometry of low-voltage transistors. Since the above methods use non-standard fabrication techniques, the manufacturing cost goes high and the signal integrity might become hazardous. This paper, therefore, proposes a new design technique that enables the design of high-voltage inverter using only standard low-voltage MOSFETs. Circuits designed by this method, therefore, can be produced in a standard CMOS process and no additional production cost is required. The proposed method adds a kind of safety circuitry to the low-voltage transistors making up high-voltage circuits in such a way that all the transistors in the circuits operate within a given safe operating voltage. This paper discusses how to design the safety circuit and shows the validity of this design method through a design example using a circuit simulation program, SmartSpice. In order to convert a low-voltage signal to the high-voltage signal which is demanded in high-voltage circuits, a new level shifter architecture is proposed also. The simulation results shows the high-voltage output driver will be safely operating under many severe input and power supply conditions.

社會變動의 時·空間論的 模型에 關한 考察

李振馥 건국대학교 1981 政法論叢 Vol.16 No.1

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.

大統領 리더쉽이 立法過程에 미친 영향

李振馥 건국대학교 사회정책연구소 1996 사회과학연구 Vol.6 No.-

Modern society is the era of administrative states. As the functions of state in modern society have enlarged, the functions of government have also enlarged and strenghtened. Specially in Korea, the position and role of president have been the important issue in the process of constitutional amendment since its enactment. Those variables which have affected the legislative process are the government power, political parties, interest groups, voters and local pressures. Legislative system plays an important role of authorization and legitimization of policy decisions-making formed in the given political system. The presidential's leadership has been studied putting situation, personality, policy-orientation and legitimacy of power as independent variables. However, the presidential Influence on the legislative process can show, vice-versa, the pesidential's leadership and the characteristics of Korean political system. An american sociologist Sidney Hook intented to recognize exactly the roles of leaders in the historical process. He classified the types of political leader ; Eventful Man and Event-Making Man. James D. Barber delineated the main outlines of a political style by the interaction of two main dimensions. The first is activity-passivity in performing the role. The second dimension is positive-negative affect toward his activity. Put together, these two crude and simple variables delineate four political types. Briefly, the active-positive shows a style oriental primarily toward productiveness, the active-negative toward personal ambition, the passive-positive toward affection ; and the passive-negative toward(minimal) performance of duty. The presidents focused on here are Park Chung Hee, Chun Doo Hwan and Noh Tae Woo who had worked as military officers for most of their lives. We can argue each types of these political leaderships had showed a style oriental primarily toward the interactive types as mentioned ; Park Chung Hee and Chun Doo Hwan toward not only the Eventful Man but also the active-negative, and Noh Tae Woo toward not only the Event-Making Man but also the passive-negative. To strengthen the government power under the control of president had been reflected in the legislative process, and particularly the influences of presidental's leadership on the legislative process might have been a popular and powerful factor in the of presidential's government states in Korea. In summary, 'An Influences on the Legislative Process of the Presidential's Leadership' should help to grasp the special features of Korean political system and to suggest a desirable type of persidential' leadership in Korea to meet the urgent need of 'New Korea Creation' Era.

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.

Bushing을 이용한 광대역 마이크로스트립 안테나 설계

양진모,최지훈 대구대학교 2006 대구대학교 학술논문집 Vol.1 No.2

일반적인 마이크로스트립 안테나는 높은 Q값으로 인해 5% 이내의 대역폭을 가진다. 이는 마이크로스트립 안테나의 가장 큰 단점이라 할 수 있다. 협대역이라는 문제점을 해결하기위하여 낮은 유전율의 기판을 사용하고, 유전체의 두께를 증가시키면서 부싱(bushing)을 삽입하는 방법을 이용하였다. 부싱은 유전체의 높이가 증가하면서 SMA 커넥터가 가지는 인덕턴스 성분을 제거하는 역할을 하게 된다. 유전체의 높이가 25mm일 때 부싱을 삽입하여 약 12%(114MHz)의 대역폭을 얻었다. A standard microstrip antenna has bandwidth within 5% because of high Q. This is the biggest shortcoming of microstrip antenna. In this paper, the method of inserting a bushing to the thick microstrip antenna with low permittivity substrate is proposed to improve the bandwidth of microstrip antennas. The bushing effectively removes the inductance of SMA connector that occur as the height of substrate increases. When the proposed busing technique is applied to the microstrip antenna whose thickness of dielectric substrate is 25mm, the bandwidth of almost 12%(114MHz) was obtained.

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.

한국지방자치단체의 의원선거의 실태분석 : 1995년 충청북도 기초 및 광역의회를 중심으로

이진복 건국대학교 사회정책연구소 1997 사회과학연구 Vol.7 No.-