Liverpool 정부 소고

황영국 慶尙大學校 1995 論文集 Vol.34 No.1

Liverpool's government was unfortunate in having to deal probably the most complex set of problems ever faced by any British gocernment up to that date : ecoomic and social distress, the demand for Cathoric Emancipation in lreland, and widespread disturbances which surgested that Britain might be on the verge of a revorution like in France in 1789. Strong measures were taken to relieve the distress. As a result of this, number of much needed reforms and impovements were introduced, which led thes phase of the government to be described as liberal toryism. The traditional view still accepted by writers such as Derek Beals is that the Tories were reactionary until 1822, when they suddenly became 'liberal' reformers. More recently Several new points have been suggested : J.E.Cookson suggests that the government was net reationary bofore 1822.

잭슨期 産業革命의 性格

黃榮國 慶尙大學校 1984 論文集 Vol.23 No.2

From 183s' to the Civil War, the United States of America was developed its economic situation with a domestic confrontation. After 1820s, the frame of 「American System」 had been established, however, all domestic economic policies were charged in Jacksonian period. After 1830s American industrial revolution was progressed in many ways of conflict, and led already by the cotton industries in New England districts. Though the advocates of the 「american System」 wanted to unify the national products, on the contrast, there was the character of individual and regional in products. On the one hand, realization of Jacksonian Democracy meant a slackness of national unification in products which the party of 「American System」 had mapped up.

드로이젠의 歷史觀 硏究

黃榮國 진주산업대학교 1979 論文集 Vol.17 No.-

The autonomy of historical thought is seen at its simplest in the work of selection. The historian who tries to work on the commonsense theory, and accurately reproduce what he finds in his authorities, resembles a landscape-painter who tries to work on that theory of art which bids the artist copy nature. He may fancy that he is reproducing in his own medium the actual shapes and colurs of natural things; but however hard he tries to do this he is always selecting, simplifying, schematizing, leaving out what he thinks unimportant and putting in what he regards as essential. It is the artist, and not nature, that is responsible for what goes into the picture. In the same way, no historian, not even the worst, merely copies out his authorities; even if he puts in nothing of his own which is never really possible, he is always leaving out things which, for one reason or another, he decieds that his own work does not need or cannot use. It is he, therefore, and not his authority, that is responsible for what goes in. On that question he is his own master: his thought is to that extent autonomous. An even clearer exhibition of this autonomy is found in what I have called historical construction. The historian's authorities tell him of this or that phase in a process whose intermediate phases they leave undescribed; he then interpolates these phase for himself. His picture of his subject, though it may consist in part of statements dirctly drawn from his authorities, consists also, and increasingly with every increase in his competence as an historian, of statements reached inferentially from those according to his own criteria, his own rules of method, and his own canons of relevance. In this part of his work he is never depending on his authorities in the sense of repeating what they tell him; he is relying on his won powers and constituting himself his own authority; while his so-called authorities are now not authorities at all but only evidence. The clearest demonstration of the historian's autonomy, however, is provided by historical criticism. And for history, the object to be discovered is not the more event, but the thought expressed in it. To discover that thought is already to understand it.

주축 런아웃이 절삭흔과 표면거칠기에 미치는 영향에 관한 연구

황영국,이춘만,임경진,하재용,신성우 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-

The radial error motion of a machine tool cutter/spindle system is critical to the dimensional accuracy of the parts to be machined. This paper presents an investigation into spindle run-out effects on cutting mark and surface roughness. We experimented the effects of spindle run-out on surface roughness in flat-end milling by cutting AL 7075 workpiece in various cutting conditions. In order to analyze the effects of run-out on the surface roughness, the spindle's radial error motions was measured by mounting a sphere target onto the spindle as a reference. From the experimental results, it was found that spindle run-out makes a directive effects on surface roughness in flat-end milling.

Ranke 史學과 歷史主義

黃榮國 진주산업대학교 1976 論文集 Vol.14 No.-

The Historians of the early and middle nineteenth century had worked out a new method of hand1ing sources, the method of philosopica1 criticism. This essentially consisted of two operations; frst, the analysis of sources into their component parts, distinguishing earlier and later elements in them and thus enabling the historian to discriminate between the more and the less trustworthy Portions: and secondly, the internal criticism of even the more trustworthy parts, showing how the author's point of view affected his statement of the facts, and so enabling the historian to make allowance for distortions thus produced. The historian’s buisiness was to ascertain facts by the use of critical method, and to reject the invitation given them by the positivists to hurry on to a supposed second stage, the discovery of general laws. Consequently the claims of Comtian sociology were quietly set aside by the abler and more conscientious historians, who came to regard it as sufficient fot them to discovor and state the facts themselves; in the famous words of Ranke, wie es eigentlich gewesen. History as the knowledge of individual facts was gradually detaching itself as an autonomous study from science as the knowledge of general laws. Nineteenth-century historigraphy did not abandon Hegel's belief that history is rational-to do that would have been to abandon history itse1f-but rather aimed at achieving a history of concrete mind by insisting on the elements which in his formal Philosophy of History Hegel had neglected, and working them into a solid whole. of his more immediate disciples. Baur specialized in the history of Christian doctrine, and Marx in the history of economic activity, while Ranke was later to apply systematically his conception of historical movements or periods as the realization of a conception or idea such as Protestantism.

대용량 토출용 나사펌프 개발에 관한 연구

황영국 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.3

In this study, the development of a three-screw pump for high-capacity discharge was carried out. Benchmarking and reverse engineering for advanced products were performed to design and manufacture power rotor and idler rotor for high capacity and high pressure. Through flow analysis, performance verification of the entire design was performed and prototypes were manufactured. As a result of performance evaluation on prototypes, it was found that the development specifications were satisfied.

Development of a Variable Preload Spindle by using an Electromagnetic Actuator

황영국,박인황,Kyung-Soo Paik,이춘만 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.

Variable preload technology involving varying preloads with respect to the spindle speeds and machining conditions is the most suitable preload method for spindles that require extensive rotation. The necessity of variable preload technology will continue to grow as the spindle speed and efficiency increase in order to improve the productivities of machine tools. This study attempts to develop a variable preload spindle that varies the preload with respect to the rotation number, allowing high speed rotation, and improves the stiffness characteristics. The authors designed and fabricated a variable preload device composed of an electromagnetic actuator and other components. We then evaluated the performance of the fabricated variable preload device with an experiment using load cells and subsequently determined the performance of the device and identified areas requiring improvement through a performance evaluation. Finally, we developed a variable preload spindle by applying the produced variable preload device. Smooth operation was verified through performance evaluations of the variable preload spindle, and stiffness improvement was verified through preload variation.

수액용기 발전추이 고찰

황영국 (사)한국포장협회 2004 包裝界 Vol.137 No.-

Surface roughness and cutting force prediction in MQL and wet turning process of AISI 1045 using design of experiments

황영국,이춘만 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.8

This paper presents an investigation into the MQL (minimum quantity lubrication) and wet turning processes of AISI 1045 work material with the objective of suggesting the experimental model in order to predict the cutting force and surface roughness, to select the optimal cutting parameters, and to analyze the effects of cutting parameters on machinability. Fractional factorial design and central composite design were used for the experiment plan. Cutting force and surface roughness according to cutting parameters were measured through the external cylindrical turning based on the experiment plan. The measured data were analyzed by regression analysis and verification experiments were conducted to confirm the results. From the experimental results and regression analysis, this research project suggested the experimental equations, proposed the optimal cutting parameters, and analyzed the effects of cutting parameters on surface roughness and cutting force in the MQL and wet turning processes.

Evaluation of Machinability According to the Changes in Machine Tools and Cooling Lubrication Environments and Optimization of Cutting Conditions Using Taguchi Method

황영국,박수현,이춘만 한국정밀공학회 2009 International Journal of Precision Engineering and Vol. No.

This study analyze the effect of machine tools, cooling lubrication environments and cutting conditions on surface roughness and cutting force, and propose the combination of cutting conditions which minimizes the effect of machine tool variables on the dispersion of cutting force and surface roughness by treating the changes in machine tool itself and the installation environments as a noise factors. To do so, the Taguchi method is used to establish an experiment plan, and flat end milling is carried out to measure cutting force and surface roughness. The research results show that in the case of cutting force, the effect of cutting conditions is dominant, and changes in machine tools and cooling lubrication environments barely have effect on cutting force. However, in the case of surface roughness, all of the cutting conditions, machine tool and cooling lubrication environment variables have impact. In order to select a combination of cutting conditions insensible to changes in machine tools, considerations for feed per revolution and axial depth of cut turn out most important in the aspect of cutting force, and considerations for feed per revolution is most important in the surface roughness.