民主性提高를 爲한 行政分權化의 諸問題

李又豊 충남대학교 행정대학원 1985 行政硏究 Vol.5 No.-

大量消費 時代의 마아케팅調査

金禹植 청주대학 상·경영학회 1972 商學論叢 Vol.14 No.-

입도분포가 넓은 분철광석의 유동층 환원에 있어서 분화와 비산특성

정우창,김순경,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2

The reduction behavior of fine iron ore of multi-sized distribution in a fluidized-bed has been extensively investigated in the aspects of degradation and elutriation. The present study has endeavored to obtain fundamental data for effective plant operations and improvements of devices in fluidized-bed systems through fully understanding the effects of operating parameters and dimension or design of reactor on the degradation and elutriation of fine ores during the fluidized-bed reduction. In the fluidized-bed reduction of fine iron ore of multi-sized distribution, the minimum flurdization velocity for fine ore particles smaller than 1500㎛, of which flurdization behavior is governed by the velocity of gas, decreases with a increase in temperature while that for coarse ore particle larger than 1500㎛, of which fluidization behavior is governed by the force of inertia, increases with temperature. The minimum fluidization velocity equation proposed by Wen and Yu shows most reliable prediction in this study. The abrasion and degradation during fluidized-bed reduction are more severe when the ore particles are coarse, and in this study, the weight pct of ore particles smaller than 250㎛ increases from 27 wt% to 45 wt% and that of ore particles smaller than 500㎛ increased from 42 wt% to 57wt% after th fluidized-bed reduction. It has been confirmed with a mathematical model of elutriation lass that as the superficial gas velocity increases, the fluidization of coarse ore become more vigorous but the elutriation rate and the concentration of fine ore entrained in gas also increase and it finally results in a high elutriation loss.

게임에서 非母數統計 檢定에 의한 分布函數의 判定

崔于珍 울산대학교 1977 연구논문집 Vol.8 No.2

게임에 있어서 보상의 집합위에 정의 가능한 모든 분포함수들 중에 하나의 분포함수를 선택하는 문제를 非母數 統計的 方法을 써서 판정할 수 있음을 제시하였다. Im game in which we should choose one distribution from all possible distribution functions over the rewards set R, the nonparametric methods gives the useful criterions for selecting one distribution.

k-first countable 공간에 대한 小考

권우두,김홍구 金烏工科大學校 1998 論文集 Vol.19 No.-

J. S. Park는 1998년에 c-first countable 공간을 정의 하고 이 공간이 가지는 여러 가지 위상적 성질을 연구 발표 하였다. 본 논문에서는 c-first countable공간을 보다 일반화 시켜 k-first countable 공간이라 하고 이 공간이 가지는 일반적인 위상적성질과 이미 알려진 다른 위상공간 과의 상관 관계를 조사 하였으며 특히 어떤 위상공간이 countably compact 이고 normal인 공간이 k=first countable 공간 이면 어떤 closed subset 에 대해서도 아주 유용한 특별한 countable neighborhood base를 가진다는 사실을 밝혔으며 또한 countable compact 이고 normal인 공간이 k-first countable 공간이 되기위한 필요충분조건을 구명하였다.

Hamlet에 나타난 惡의 實在와 外觀

유우선 제주대학교 1983 논문집 Vol.16 No.1

As we know, the setting of Hamlet is the castle of Elsinore in medieval Denmark. But it should be regarded not as a historical Denmark but as a contemporary world that exists in Shakespeare's imagination. The ghost of elder Hamlet at the beginning is the key to the whole paly. As Maynard Mack says, it is the supreme reality, representative of the hidden ultimate power. Hamlet begins with an explosion in the first act and the rest of the play is the reverberation of it. As the ghost comes from it's grave, returning to the same place, so this play begins with death symbolized by the time of midnight of a freezing cold winter and ends with terrible havoc. I explored the source of evil in Hamlet embodied by Claudius as serpent by interpreting the tree of knowledge of good and evil planted in the garden of Eden as an archetypal symbol. The reality of evil is sinfulness, the evil's appearance is hypocrisy painted with goodness, and the destination which evil reach is nothingness. Following the preface, I introduced the idea of Elizabethan World Order in the second part of my essay in order to define the meaning of the cosmic order, and to throw light on the relation between the microcosm or man and the macrocosm or physical universe. By Claudius's violation of the natural order, his state is'rotten'and evil is established. This evil flows not merely horizontally through humanity, but vertically also. It runs through time after time, generation after generation. The poison let loose in Denmark destroys indiscriminately the good, the bad and the indifferent. Man could move upwards, through the control of reason, towards angelic apprehension and even godlike qualities. However, the weapon of man's reason falls downwards towards the level of the beast due to the poison of evil. We see in Hamlet a twofold flaw of reason. For one thing, it fails to show the prince how to deal with evident external evil and it also fails to enable him to control evil within himself. Accordingly the tragic waste in Hamlet can be seen as a failure to fulfil a noble and godlike human potential. The tragedy of Hamlet goes further than the disintegration of the Renaissance ideal. The corrupted man disguises his evilness with good appearances. To Claudius appearance is the reality of the situation. He uses savage political plots to change "seeming" into "being". The body of Claudius's Denmark functions and is sustained through interdependence of usurper and blind supporters. Most people in Denmark are quite content with the surface appearances of life and refuse even to consider the ends to which mortality brings all men, Shakespeare unvells man's hypocrisy by using the images of clothing, painting, mirroring. The final destination of evil is death and nothing. In Hamlet the reality and existence of man is death. In the last act of play, we discover a transfarmed man. The greatness of Hamlet as a human being rests not so much in what he does or fails to do as in what he understands. When Hamlet returns from his deadly voyage, he accepts human limitation and realizes that evil cannot be terminated because he cuts down Claudius. The power of evil can be destroyed only through death. He admits and transcends death by spiritual recognition. He is no longer one of passionate, rebellious Renaissance idealist of Wittenberg. Hamlet himself survives the rest only a few moments, and before he dies, there is the roll of drums of Fortinbras which heralds the end of the old story and the beginning of the new.

회분식 고온 유동층 환원로내 입도본포가 넓은 분철광석의 유동특성

정우창,김순경,전언찬 동아대학교 공과대학부설 생산기술연구소 1997 生産技術硏究所硏究論文集 Vol.2 No.2

Currently more than 80% of raw iron ore is produced in a state of fines uder 8mm in diameter on the world. In order to produce metallic products such as DRI(Direct Reduced Iron) and/or hot metal directly from fine iron ore without pretreatmnet, a fluidized bed technology should be adopted. In the present study, characteristics of a fluidized bed with iron ore fines in the size range of 1 to 5 mm have been investigated at high temperature(700∼850℃) in terms of the minimum fluidization velocity, fluidization patterns, the pressure drop, the solid hold-up in the reator, etc. using a laboratory scale fluidized bed reactor. It was observed that the minimum fluidization velocity of particles in wide size range is equivalent to that of the particle of harmonic mean size. The optimum gas velocity for fluidization is about 1.2 to 1.3 times of the minimum flurdization velocity and this is similar to the result observed in the experiments in cold (room temperature) state. During heat-up and reduction in the reactor, iron ore particles are degraded due to the thermal and reduction reaction shocks. It was also found that the degradation of ore particles was completed in the early stage of reduction reations, within 10 minutes.

NH₃가스 미량첨가 분위기에서의 CO-H₂혼합가스에 의한 과탄화철의 합성

정성실,정우창,강흥원,박응열,정원섭,박익민 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.11

The synthesis process of iron carbide was proceeded in two stages of reduction of hematite fines by H₂ gas, and carburization of the reduced metal by CO-H₂ gas mixture at 600℃. The surface of reduced iron was pre-treated with an addition of 0.05 vol% NH₃-Ar before carburization. The synthesized iron carbides were comprehensively explored by C/S analyzer (Low C/S determinator), Mossbauer spectroscopy, X-ray diffraction patterns (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Raman spectroscopy at various reaction times of 5, 10, 15, 20, 25, 30, and 35 min. By addition of a small amount of NH3 gas, the super iron carbides contained 10 wt% carbon were made, and such addition stabilized iron carbides. It was found that addition of NH3 gas played a major role in the formation of iron carbide without decomposition (Fe₃C→ 3Fe+C) of iron carbides and precipitation of free carbon. From these results, we succeed in synthesis of super iron carbide, Fe_(5)C₂, with a stable single phase without Fe and Fe₃C phases. (Received August 2, 2004)

T1계 고온초전도체용 {113}<121>집합조직 Ag 기판

김수영,정대영,시게오호리우찌,정우창,조경목,박익민 대한금속ᆞ재료학회 2006 대한금속·재료학회지 Vol.44 No.3

촉매합성된 다중벽 탄소나노튜브의 급냉 열처리법에 의한 정제

김용환,서용기,정우창,정원섭 대한금속ᆞ재료학회 2006 대한금속·재료학회지 Vol.44 No.3