견인용 동기전동기의 시동 및 운전특성 해석에 관한 연구

황정원,조용길,송호신,박한규,우정인 東亞大學校 1994 東亞論叢 Vol.31 No.1

It needs a large capacity of equipments to test the starting performance of middle and large synchronous motors in a factory. This paper propose a new method which is the combination of single phase AC applied test and usual routine test with a small synchronous test machine and testing equipments. We can obtain the results from these proposed tests as follows ; (1) The starting performance and stabilized operation at variable speed is predicted from this results. (2) The armature winding leakage reactance is resulted from the no-load saturation curve, the short-circuit charactristic curve and the armature-reaction magnetomotive force converted to the field current. (3) This test must be performed twice, one for short-circuiting the field winding, the other for joining a resistance between the field terminals, as a result the unknown constants in equivalent circuits are identified. (4) Inverter-fed three phase voltage with variable frequency is applied to armature terminals, as a result, We show the actual armature leakage reactance and reaction of the induced harmonic voltages from rotor.

솔-젤공정에 의해 기공보정된 한외알루미나 여과막의 기체투과 특성평가

조원준,정은정,이진휘,서성조,서동호 서울産業大學校 1997 논문집 Vol.45 No.1

서로 다른 입자크기의 3층구조를 갖는 튜브형태의 한외알루미나 분리막은, 일반적으로 제조공정중 분리층에 결손부분이 발생하기 때문에 낮은 선택도 및 제거율을 보인다. 이와같은 결손부분을 보정 하고 보정전, 후의 분리막에 대한 기체장치에 의한 투과도(permeability) 및 선택도(selectivity)를 측정하였다. Colloidal silica 솔의 deposition에 기인하여 기체 투과율의 감소가 60%였다. 한외알루미나 여과막의 보정에 있어서 습도조절에 의한 선택적 적심법은 비록 deposition에 의한 문제점을 내포하고 있으나, 기체분리에서도 효과적인 방법이다. The 3-layer tubular type alumina membrane consisting of different pore size shows the decreased selectivity and rejection because of cracks in the separation layer generally occurred during the manufacturing process. For the comparing of native and modified membranes, the modified membranes were tested by permeability by gas equipments, selectivity for the gases after caulking. The permeabilities are decreased 60% for the gas caused by deposition of colloidal silica sol after caulking. In conclusion, the Alternative Wetting Method by humidity control had the effect for the modification of ultrafiltration alumina membrane for separation of gases, though having problem of deposition.

家定의 에너지 節約을 위한 溫突暖房 施工에 대한 硏究

崔元浩 忠州大學校 1987 한국교통대학교 논문집 Vol.20 No.2

The hypocust heating construction has been carried out through experience by the skilled hands. I made an attempt to suggest a concrete regulation in order to make a techoical and scientific hypocoust construction and tried to explain on the energy saving improving heating hypocaust construction improving the conventional heating construction. 1. We can prominently increase the hypocoust thermal efficiency by constructing adiabatic ondol more than 50 ㎜ around cooking stove in order to prevent heating loss from leaking out of fireplace. 2. In order to improve the overall heat transmission to the government standard coeffieient, we must have adiabatic material layer more than 20㎜ including rockwool and ploystyrom foam.

순/구개열 환자에서의 교정-보철 치험례

장원석,최영철,이긍호 대한소아치과학회 2000 大韓小兒齒科學會誌 Vol.27 No.3

순ㆍ구개열(cleft lip and palate)은 구강악안면 영역에서 가장 빈번하게 발생하는 선천성 기형 중 하나로 유전적, 환경적 요인에 의해 발생된다. 순ㆍ구개열 환자는 입술, 코 등의 기형을 보이며, 치과적 문제점으로 , 이환측 측절치는 결손되어 있거나 과잉치가 존재하고 형태적 이상을 보이는 경우가 많고, 맹출하지 못하지 못하거나 이소맹출을 하게된다. 이른 시기에 수행된 수술의 반흔조직(scar tissue)으로 인하여 상악골 설장의 장애가 발생되어 흔히 골격성 Ⅲ급 부정교합이 야기되기 쉬우며, 섭식장애와 발음장애를 보이기도 한다. 이러한 복잡한 문제로 인하여 여러분야의 전문가들로부터 다양한 관리가 필요하다. 순/구개열(cleft lip and alveolus only)은 악안면 영역에 제한적으로 영향을 미친다. 비이환측은 전방으로 회전되어 수평피개가 증가되고, 이환측은 내측으로 회전되어 견치부에서 end to end 관계, 혹은 반대교합을 보인다. 순/구개열 수술은 이와 같은 문제점 등을 개선시키기 위한 것이며, 상악골의 전후방적 성장에는 큰 영향을 미치지 않는것으로 보고되고 있다. 본 증례는 좌측에 순/구개열을 가진 5세 3개월의 여아로 생후 3개월 및 3세에 두 번의 구순열 봉합 수술을 받았으며, 상악 좌측 유측절치와 영구 측절치가 결손되어 있었고, 다발성 우식증 및 비구누공(oroantral fistula)이 존재하였으며, 골격성3급 부정교합을 보였다. 그러나 본 증례가 지니고 있는 골격성 Ⅲ급 부정교합은 구순열 수술후의 반흔조직에 의한 것은 아닌 것으로 판단되었으며, 환자의 기능과 심미성을 회복하기 위하여 혼합치열기 동안 고정성 교정치료를 시행한 후 보철치료를 시행하여 비구누공을 key and keyway attachment와 Konus crown을 이용한 가철성 obturator로 폐쇄하여 양호한 결과를 보였다. 주요어 : 순/구개열, 교정치료, Obturator Cleft lip and palate is one of the most common congenital defects in oho-maxillo-facial region Because most patients undergo surgical repair in early life. the sagittal jaw relationships used to be deteriorated gradually from palate surgery up to adulthood. Also. the maxillary lateral incisor may be absent or atypical-shaped in the cleft site and may not erupt or erupt ectopically, so multidisciplinary dental cares are needed for cleft lip and palate patients. The effects of the cleft lip and alveolus seem to be limited to that part of the dentofacial complex that surrounds the cleft area. In the maxillary arch, the anterior part of 7he non cleft segment has a tendency to be rotated forward. On the other hand, the cleft segment has a tendency to rotated slightly medially ;hence. the tendency for canines to be edge-to-edge and sometimes in crossbite. Lip and alveolus surgery adoquetely correct these problems, with little untoward effect on the skeletal maxillary-mandible relationships. In this report, the patient has a repaired lip and cleft alveolus on the left side with congenital missing on #62, #22, oronasal fistula. and skeletal class Ⅲ malocclusion which is not affected by lip surgery. Dental treatments for this patient including orthodontic(space supeivision, functional regulator in mixed dentition, fixed therapy in permanent dentition) and prosthodontic(removable obturator with key and keyway attachment and Konus crown) therapy were performed to improve the patient s functions and esthetics.

IC 실현에 적합한 정현파 능동 발진기의 회로 및 특성에 관한 연구(Ⅱ)

이원건,손태호,박종연 江原大學校 産業技術硏究所 1991 産業技術硏究 Vol.11 No.-

Two kinds of simple active oscillators are proposed and analyzed assuming that operational amplifier has two-poles frequency characteristics. The first circuit is composed of one operational amplifier, one resistor and one grounded capacitor. The second oscillator is realized with one operational amplifier and three resitors. Proposed oscillators have the low sensitivity of the oscillation frequency for little variations of the passive element values. By the experimental results obtained with Op-Amp.?A741, the simple oscillators can be useful for the frequency range 1.25 KHz≤f? ≤400KHz for the active -R ocillator, and it is shown to transform the active-R oscillator circuit into the voltage controlled type.Therefore, two kinds of oscillators circuit are attractive for the IC realization, because they hve one operational amplifier, one resistor and one grounded capacitor, or three resistors.

구형 Helicobacter pylori의 중성구 매개 산화활성

홍원선,김혜원,이학성,명승재,정훈용,양석균,김진호,민영일,정명희 대한암예방학회 2000 Journal of cancer prevention Vol.5 No.3

Si(111)표면 위에서 알칼리 금속의 흡착에 관한 연구

곽호원,손정식 경운대학교 산업기술연구소 2002 産業技術硏究論文誌 Vol.5 No.1(A)

The adsorption system is also a fundamental interest because of its unique electronic properties such as measurement of work function change, adatom-core level shift. The effects of adsorption and desorption of alkali-metals on Si(111) surface were investigated by using AES and FHEED-system. It was found that the growth mode of K on Si surface was layer by layer growth and the saturation coverage was 2.0 ML at room temperature. Alkali-metals such as Li and K, adsorption and desorption processes on Si surface according to the alkali-metal thickness and substrate temperatures were accurately defined. By applying the isothermal desorption method, the desorption energies of Li/Si(111) and K/Si(111) surfaces was measured. On Li/Si(111) and K/Si(111) surfaces, the desorption energies were 3.07eV, 2.19eV respectively.

이개 피부 연골 이식술의 다양한 이용도

박원진,이윤호,김병건 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.3

In the case of congenital deformity or acquired complex tissue defect at various head & neck area, grafts, flap, tissue-expander & vascularized composite graft were used for correction of defects & deformities. Among them, when the large defects, flaps & tissue expander were used. When the small defects, skin grafts & composite graft were used. However when reconstruction of minor defects or deformities of eyelid, ear, nose and palate, which is not able to reconstruction with simple grafts, and requires skeletal supports, we have used auricular chondrocutaneous graft. Auricular chondrocutaneous grafts were classified into three type. Type 1 is skin-cartilage balanced form. Type 2 is cartilage excess form, Type 3 is skin excess form. We have used each type in each case. Author successfully treated 10 patients by free chondrocutaneous grafts. Of these. 1)patients who have defects or deformities of nose 2)patients who have defects of deformities of ear 3)patients who have defects of palate 4)patients who have deformities of eyesocket We corrected minor deformities or defects of head & neck area with auricular chondrocutaneous graft and auricular chondrocutaneous grafts provide an excellent & simple method for repair of minor defects & deformities at head & neck area. Thus we represent our methods & cases with review of literature.

한 대학병원 정신과 낮병원에 관한 분석적 고찰

정원철,이영호 慶南專門大學 1999 論文集 Vol.27 No.1

응급실에 내원한 환자에서 어지럼증의 원인과 임상양상의 분석

문원식,정경운,위준선,문정미,전병조,김용권,소정일,류진호,허탁,민용일 대한응급의학회 2001 대한응급의학회지 Vol.12 No.3

Background: Recently, The number of patients who have been complaining of the vertigo or dizziness has been increasing due to rapid growth of elderly population and senile disease. The differentiation of dizzy patients is not familiar to most emergency physicians. This study was designed to differentiate true vertigo and to investigate the clinical difference among central vertigo, peripheral vertigo, and other causes of dizziness. Methods: The authors analyzed the cases of 237 dizzy patients who visited the emergency department of Chonnam University Hospital during the recent 2 years. For the base of dizziness, associated past illnesses, severity, nystagmus type, and the causes of central and peripheral vertigo. Results: Female patients were 142(59.9%) and male patients were 95(40.1%). The most common age group was the 6th decade. The origin of dizziness was classified as peripheral cause(25.3%), central cause(32.9%), and others(41.8%). As to nature of the dizziness, the rotatory sense was dominant in peripheral vertigo and the floating sense and blurred vision in central vertigo. Peripheral vertigo was triggered by position change of head and body, and central vertigo by the eye movement. Audiograms I showed that most patients with central vertigo had normal hearing, but 46.7% of thoswith peripheral vertigo had an abnormal hearing disturbance. Nystagmus was more prevalent in peripheral vertigo Conclusion: History taking and physical examination played an important role in the diagnosis of dizzy patients. An important part of the diagnosis of a dizzy patient could be to evaluate the peripheral origin, the central origin and others causes. Because central vertigo may be associated with a significant neurological pathology, spectral radiological studies, including MRI and CT, are mandatory to rule out a devastating brain lesion.