고속도강을 이용한 CFRP 복합재료의 드릴가공 특성

조규재,박종남,정용운 朝鮮大學校 機械技術硏究所 2005 機械技術硏究 Vol.8 No.1

복합재료는 각 종 기계부품, 우주항공산업, 자동차의 내장재와 구조재, 건축구조물, 선박 재료, 스포츠용품 등 다방면에서 유용하게 사용되어지고 있다. 복합재료는 여러 가지의 대체 재료로서 타 산업에 비하여 활용의 가치가 높다. 그러나 기계가공분야에서는 가공의 어려움으로 인하여 활용도가 미흡한 상태이다. 따라서 본 논문에서는 CFRP를 수직형 머시닝센터에서 고속도강 드렬로 가공한 후 흘 가공 입 · 출구부에서 표면이 고르지 못함을 확인하였으며, 가공을 할수록 유동형의 긴 칩에서 분진형태로 변하는 칩의 형상 등을 관찰하였다. Composite materials are widely used in all kinds of machine parts, aerospace industries, internal and structural materials of cars, building structures, ship materials, sporting goods, and others. It is worth while to use the composite materials as various substitutions compared with others. But it is limited to use them in the field of the mechanical processing because of the difficulties in cutting. Thus it is proved that the surface roughness is in and out of the hole processing after cutting the CFRP with HSS drilling in the vertical machining center. And it is observed that the more it is processed, the more the fluid long chip is changed into the powdered chip.

수직형 머시닝센타 이송시 스틱-슬립에 관한 연구

최경현,조규재,박종남,이승철 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.2

볼나사 미끄럼 시스템에서 고속과 고정밀도를 이루는데 중대한 문제들은 마찰과 각 구성 요소들 사이에서의 마찰과 축 방향의 강성이 감소하여 나타난다 특히, 안내면에서의 마찰은 이송정밀도를 떨어뜨리는 좋지 않은 영향을 준다. 더욱이 스틱-슬립현상과 같은 특수한 마찰 형태는 미끄럼 시스템의 저 강성에서 일어난다. 스틱-슬립은 정밀도에 나쁜 영향을 가진다. 본 논문에서는 미끄럼 시스템의 정밀도에 있어서 스틱-슬립 마찰에 의한 운동오차에 따른 변화들을 고찰하여 이송정밀도의 해결 방안을 제시하려 하였다. In the ball screw slide system the major problems in accomplishing the high-speed and high-precision are the friction between elements and the decrease of axial stiffness. Especially the friction on the guide have a bad effect on the precision of sliding. Furthermore stick-slip occur when the low stiffness of slide system. The stick-slip have a bad influence on the precision. In this research, the affection of stick-slip friction to the precision of the slide system is studied and the possible solution of the precision is proposed.

다공질 실리콘을 이용한 미세 기계구조의 제조

조찬섭,이봉희,이종현,최규만 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1

Micromechanical structures such as cantilever beams and bridge array (~μm thick, 100~500 μm long) were fabricated by formation of porous silicon layer. The beam array of n/p samples have irregular etched surface and cusp. On the otherhand, beams of n/n^(+)/n structure have clear etched surface and no cusp.

대기경계층 난류유동의 Large Eddy Simulation 해석기법의 알고리즘에 관한 연구

조창주,서성규,박종혁 國立 麗水大學校 環境問題硏究所 1998 環境硏究論文集 Vol.1 No.-

LES(Large eddy simulation) is an intermediate technique between the direct simulation of turbulent flows and the solution of the Reynold-averaged equations. The method is initiated by the introduction of a filtering operation which seperates the large-scale and small scale structures. The large scales are computed explicitly, whereas the small scale necessarily are modeled. In this study, a LES model used three-dimensional incompressible Navier-Stokes equation is calculated for the numerical simulation of turbulent flow in the PBL. Instantaneous and detailed flow of velocity component war obtain with LES and horizontal mean vertical profile of potential temperature was indicated typical profile in the PBL.

레이저가공기를 이용한 SAPH400의 절단특성에 관한 연구

조규재,박종남,이승철 朝鮮大學校 機械技術硏究所 2004 機械技術硏究 Vol.7 No.1

본 연구의 목적은 자동차 구조용 열간 압연강(SAPH400)의 몇 가지에 대한 최적의 절단 가공 조건을 구하기 위한 실험이다. 현재 대부분의 절단가공은 기계적인 방법이 활용되고 있으며,절단속도와 정밀도,금형제작,공구수명 등의 문제점이 많아 CO₂레이저 가공기를 이용하여 이를 해결하고자 하였다. 실험은 유입가스의 압력,절단속도 및 출력의 변화를 주었을 경우 절단면의 조도와 폭에 어떤 영향을 주는가를 연구 · 분석하였다. 실험결과 출력,절단속도 및 절단가스압력을 변화시켰을 때 출력은 1500W,절단속도는 1100mm/min. 절단 가스압력은 0.5kgf/㎠마 일 때 가장 양호한 표면 거칠기 값 18.06㎛을 나타냈다. This study aims at making experiments to fine the optimum cutting processing conditions of some sheets in common use of Steel Automobile Press Hot 400(SAPH400). Current mechanical methods for cutting processing of most have several problems in relation to cutting speed, precision, manufacture of metal mold and life of tools, which we tried to solve by using the CO₂ Laser Machining. We studied and analyzed what effects on the roughness and width of a section changes in the pressure of blowing gas, cutting speed and power according to the quality and thickness of the material might exert. The results from this experimental study are summarized as follows, when power, cutting speed and gas pressure were changed, the finest value of surface roughness, 18.06㎛ was attained at power of 1500W, cutting speed of 1100mm/min and gas pressure of 0.5kgf/㎠.

USB I/O를 사용하는 산업용 제어기의 설계 및 제작

조규상,이종운 동양대학교 산업기술연구소 2001 東洋大學校 産業技術硏究所 論文集 Vol.3 No.1

PLC or PC I/O cards those are generally used in an industrial machines have some weak points. In this paper, to overcome these weak points, an industrial I/O controller using USB bus is designed and implemented and it has the features, such as, a shortened wiring, an ease of use, and a competitive price. Cypress' Ezusb chip, USB embeded microprocessor, is used to develop its hardware. Driver program for Widows are designed by using WDM(Windows Driver Model), And a library programs and sample application software are developed for user's convenience using Visual C++.

癌의 免疫治療에 對한 考察

朴鍾鶴,孫彰奎,趙鍾寬 대전대학교 한의학연구소 2001 한의학연구소 논문집 Vol.9 No.2

A literature study on oncological immune therapy was done, and the results were as follows. 1.Oncological immune therapy is classified as specific·non specific therapy or active·inactive therapy, and in tumor immune response, cellular immunity operates mainly, so activity of T lymphocytes and macrophages are closely related with growth, progress, metastasis and prospect of tumor. Recently, Immune therapies of gene which use cytokines and HLA-B7 are carrying out. 2.In oriental medicine, development of disease is closely related to up and down of healthy qi, so healthy qi operates as a immune factor and resistance factor. 3.On the base of theory "Increasing healthy qi reduces mass(養正則積自除)", strengthening body resistance is emphasized in cancer therapy. Also strengthening body resistance activates cellular immune response and promote killing tumor facility of T-cell. 4.In clinical view, using immune therapy after operation, radiation, and chemotheraphy is more effective than immune therapy itself, so it is expected that east-west cooperation will be effective in cancer therapy. 5.The study of oncological immunity is progressed on emphasizing T-cell and it is related to oriental medical theory "strengthening healthy qi to eliminate pathogen(孵正祛邪)" and advanced study is expected in future.

CCA 처리재로부터 방부제 유효성분의 용제추출

김규혁,공일곤,나종범,조재성,김재진 한국목재공학회 2003 목재공학 Vol.31 No.4

본 연구는 CCA 처리재로부터 방부제 유효성분을 추출하기 위한 적정 용제를 선정하고, 선정된 용제의 최적추출조건을 평가하기 위 해 수행되었다. 추출수율과 용제의 사용 및 환경 안전성을 고려할 때, 과산화수소가 CCA유효성분을 추출하는 데 가장 적절한 용제로 선정되었다. 과산화수소를 이용한 추출 결과. 추출온도, 추출용제농도, 추출시간 간에 상호작용이 존재하였으나 추출온도와 추출용제의 농도가 높을수록, 그리고 추출시간이 연장될수록 CCA유효성분의 추출수율은 증가되었다. 경제적인 측면을 고려할 때 가능하면 낮은 농도의 추출용제를 사용하여 저온에서 추출하여야 하나, 이 경우에는 필요한 추출수율을 달성하기 위한 추출시간이 상당히 길어지기 때문에 40℃ 이상의 온도에서 추출이 바람직하며 사용할 추출용제의 농도는 추출시간을 고려하여 최종적으로 결정하여야 된다고 사료된다. This research was performed to select an appropriate agent to extract preservative components from CCA-treated wood, and then to evaluate the effect of reagent concentration, extracting temperature, and CCA-treated wood, and then to evaluate the effect of reagent concentration, extracting temperature, and extracting time on the removal of chrome, copper, and arsenic from treated wood. Hydrogen peroxide was selected as the best extracting agent when considered extraction yield as well as use and environmental safety. Its extraction yield was dependent on extracting variables (temperature, concentration, and time), and a highly significant interaction existed among variables. It should be possible to optimize extraction by manipulating these extracting variables. The results may suggest that the required temperature conditions for the reasonable removal of CCA components are at least above 40℃ because extracting time is too long at low temperature (20℃). Reagent concentrations for extracting at above 40℃ should be decided by considering the extracting time.

정신분열병 증상을 동반한 진행성 핵상 마비 1례

박종익,조영래,홍진표,이민규,한오수,이명종 대한신경정신의학회 2001 신경정신의학 Vol.40 No.1

저자들은 환청과 망상을 주소로 정신과를 방문한 진행성 핵상 마비 환자를 진단하고 치료하였다. 진행성 핵상 마비는 보행 장해, 치매, 수직성 안구 운동의 장해가 특징적인 증상이며, 아직까지 특별한 치료법은 알려져 있지 않다. 정신과적 증상으로는 인지기능의 장해, 정동 및 행동의 변화, 수면 장해, 정신병적 증상 등이 있으며 정신분열병과 비슷한 증상을 보이는 경우는 극히 드물다고 한다. 본 증례에서는 파킨슨 증상과 정신병적 증상이 비슷한 시기에 발현된 진행성 핵상 마비의 예를 보고하면서 진단적 중요성을 강조하고자 한다. We have experienced a rare case of progressive supranuclear palsy with hallucination and delusion. The common manifestations of progressive supranuclear palsy are gait disturbance, mental change and sign of vertical ophthamoplegia but no efficacious therapy has been known. Neuropsychiatric symptom clusters include cognitive impairment, affective and behavioral changes, sleep disturbance, and psychotic symptoms. Though schizophrenia-like psychosis has been reported but this is certainly rare. Addressing a case of progressive supranuclear palsy, in whom parkisonian symptoms appeared with concurrent psychotic symptoms, we emphasize accurate diagnosis.

靑黃散의 白血病에 對한 抗腫瘍效能 硏究

朴鍾鶴,孫彰奎,趙鍾寬 대전대학교 한의학연구소 2002 혜화의학회지 Vol.10 No.2

In the literatual study of anti-tumor effects of chunghwangsan for leukemia, the results were as follows. 1. Chunghwangsan is composed of Indigo naturalis and Realgar. The composing rate is 9 : 1 and it is made into capsule or piece. The basic administration is 0.3g per day and could increase the quantity each day. 2. The effects of Chunghwangsan is expelling toxin and colling, colling blood to detumescence, drying wetness and anticancer are. So it can be used to treat AML, CML and lymphoma. 3. The anticancer component of Indigo naturalis is indirubin which has the effects of suppression the transplanted tumor, activating the phagocyte of macrophage, promoting the maturation of myeloblast to improve cure rate of CML. The anticancer component of Realgar is As_2O_3 which has the direct celluar toxicity for leukemia cell. 4. In viewpoints of oriental medicine, leukemia is malgnant myeloid neoplasia in which pathogen invade to shaoyin(少陰). So Chunghwangsan which is expelling toxin and colling, colling blood to detumescence, drying wetness and anticancer is effective to leukemia. 5. In clinical reports, Chunghwang is often used in CML, and also used in AML, lymphoma and so on. 6. Chunghwangsan is cool-natured, so we must carefully pay attention to pregnant women and hematsdthenic patients. The main side effects are nausea, bone marrow pain, diarrhea, polydefecation, hematokezia and purpora. We sometimes take invigorating stomach medicine to prevent the side effects. 7. If we continuously develop Chunghwangsan and therapy for leukemia with syndrome differentiation, we can improve the response and cure rate for leukimia in the future.