『가장 푸른 눈』에 나타난 분열의 문제

최재구 경희대학교 비교문화연구소 1999 외대어문논총 Vol.9 No.-

EMTP를 이용한 362kV Gas VT의 철공진제거를 위한 가포화리엑터의 파라미터 선정

최재구,김익수,박경원,송희석,Choi, Jae-Gu,Kim, Ik-Soo,Park, Kyoung-Won,Song, Hee-Suk 대한전기학회 2001 전기학회논문지C Vol.50 No.4

Recently, the construction of gas insulated substation(GIS)s has been increased in Korea. But, the whole quantity of the VTs which were used in GIS has been imported. Under the circumstance that $SF_6$ gas power apparatus are being developed up to 800kV rating in Korea, the development of EHV $SF_6$ gas VT is essential for localizing the power apparatus. As for EHV VT, destructive ferroresonance can be generated due to the combination of capacitiances between poles of circuit breaker, ground capacitance of bus and nonlinear excitation property of VT core. But the theoretical analysis about ferroresonance has not been fully achieved in Korea. Therefore, in this paper the authors would like to contribute for localizing EHV $SF_6$ gas VT by developing the diagram of ferroresonance zone according to the parameters of the circuit and the saturable reactor.

Introduction of the Magnetic Pulse Compressor (MPC) - Fundamental Review and Practical Application

최재구 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.3

Magnetic switch is a kind of saturable inductor, which utilizes nonlinearity of the magnetization curve of ferromagnetic materials. The right understanding of the saturation phenomena, magnetic properties, voltage-time product, and switching characteristics of the magnetic switch is essential in designing the magnetic pulse compressor (MPC). In this paper, the historical background of research on the MPC, fundamental physical properties of the magnetic switches, and application fields of the MPC are presented. Further, an in-depth analysis of pulse compression in series and parallel MPCs is incorporated. As practical application examples, a series MPC used for water treatments and a parallel MPC used for pulsed electric field (PEF) inactivation of bacteria are cited.

전산유체역학을 이용한 집진기의 유체유동 연구

崔載玖 동남보건대학 2001 論文集-東南保健大學 Vol.19 No.1

Computer has developed rapidly and used to calculate complicated fluid flow phenomena even to climate, airplane, environment, etc. Computational Fluid Dynamics(CFD) made it possible to research the experiments in science and engineering fields which can not be performed due to their expense, danger, or time. Recently it is prospected to accelerate the proliferation of CFD to various fields. In this study, Fluent code as a commercial code of CFD is used to scrutinize the fluid flow phenomena in a simple cyclone, a representative dust collector. A tangential entry cyclone in a standard size was gridded in 2D and 3D and calculated to iteration no. over 2800 by k-ε turbulence model in the conditions of = 1.2 (10℃) =1.76 10^-5 kg/m·sec (10℃), inlet = 1, U velocity = 24.384m/sec, turbulence intensity = 5%, and characteristic length = 80×10^-5kg/m·sec, in boundary conditions U velocity = 7.1m/sec, turbulence intensity = 5%, and characteristic length = 80×10^-3kg/m·sec. The results of this study were as follows: Mass flux in the cyclone was large in the near upper area between the outside cylinder and the inside cylinder under inlet, and getting smaller downward along the cone and upward to outlet in the middle of the cylinder. In the pressure distribution the pressure was highest at the upper and outer area between the outside cylinder and the inside. cylinder, the opposit side of the inlet, and getting lower downward along the inner wall of the cone and the outside cylinder and negative upward along the middle from the dust exit to outlet area.

소아 수부 화상의 임상적 고찰

최재구 건국대학교 의과학연구소 1995 건국의과학학술지 Vol.5 No.-

From March 1991 to December 1994, 243 burn patients under the age of fifteen visit to Kon-Kuk university medical college Hospital. Among of them, 75 burn sites were hand. In these pediatric hand burn patients, retrospective study was done for the review of following issues : ago and sex distribution, cause of burn, hourly distribution of accident, depth of burn and method of treatment. The summary of results were as follows: 1) Pediatric hand burn was 30.86% of all visited burn patients under 15 years old. 2) The most common cause of burns was scalding burn as 44 cases(58.66%), followed by contact burn as 12 cases(16.00%) and steam burn 12 cases(16.00%), electrical burn as 4 cases(5.33%) and flame burn as 3 cases(4.00%). 3) The most prevalent age group was under 1 year old 25 cases(33.33%). 4) The most common injured time range was between 4 p.m. and 8p.m. 29 cases(38.66%). 5) The depth distribution was as follows: 2nd degree 60 cases(80.00%), 3rd degree 11 cases(14.66%), 1st degree 3 cases(4.0%) and 4th and degree 1 case(1.33%). 6) The method of treatment was as follow distribution: conservative treatment 73 cases(96%) and operative treatment 3 cases(4%) and admission was 18 cases(14.00%). 7) The 2 cases(2.66%) (were complicated as scar contracture with syndactyly in one case.

Solid-state Pulse Modulator for a 1.7-MW X-band Magnetron

최재구,Yong-Moon Shin,최영욱,Kwan-Ho Kim 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.9

Medical linear accelerators (LINAC) for cancer treatment require pulse modulators to generatehigh-power pulses with a fast rise time, flat top and short duration to drive high-power magnetrons. Solid-state pulse modulators (SSPM) for medical LINACs that use high power semiconductorswitches with high repetition rates, high stability and long lifetimes have been introduced toreplace conventional linear-type pulse generators that use gaseous discharge switches. In this paper,the performance of a developed SSPM, which mainly consists of a capacitor charger, an insulatedgatebipolar transistor (IGBT) - capacitor stack and a pulse transformer, is evaluated with a dummyload and an X-band magnetron load. A theoretical analysis of the pulse transformer, which is acritical element of the SSPM, is carried out. The output pulse has a fast rise time and low droop,such that the modulator can drive the X-band magnetron.

DHPLC를 이용한 유전자 돌연변이 검출

최재구,장원철 동남보건대학 2004 論文集-東南保健大學 Vol.22 No.2

The structural alteration and overexpression of p53 protein are the most common genetic abnormalities in various kinds of human cancer.

충북지역 안검하수증에 관한 임상적 고찰

최재구 건국대학교 의과학연구소 1994 건국의과학학술지 Vol.4 No.-

The blepharoptosis has many causes and may be congenital or acquired, and due to a weakness of the levator or Muller's muscle. The management of blepharoptosis mainly depends on the degree of ptosis and the amount of levator function. The result of surgical correction of the blepharoptosis is determined by the nature of ptosis, methods of operation and surgeon's skill. Authors had experienced 24(30 eyed) patients of blepharoptosis from August, 1989 to March, 1994. The results were obtained as follows: Most of the patients were congenital in origin. The ratio of congenital versus acquired blepharoptosis was 18:6, monocular versus biocular was 12:6, male versus female was 9:9 and right versus left was 7:5. In the function of the levator muscle, 9 eyes were less than 2mm, 21eyes were between 2mm to 6mm. In review of postoperative complications, incases, these symptomes were improved postoperatively after 5 months. Overcorrection was found in 3 cases, undercorrection was found in 2 cases, eyelid fold deformity was found 1 case, exposure keratitis was found 1 case.

토니 모리슨 소설에 나타난 '이중의식' : 분열에서 공존으로 --

최재구 한국현대영미소설학회 2000 현대영미소설 Vol.7 No.1

This paper aims to read Toni Morrison's novels in terms of 'double-consciousness' defined by W.E.B. Du Bois in The Souls of Black Folk, taking The Bluest Eye, Sula, and Beloved as examples. Her novels develop from fragmentation of double-consciousness toward double voicedness or double vision shaped by transforming it creatively. The Bluest Eye examines splitness of characters when they intemalize white western values without any criticism to achieve viable identity. In Sula Morrison focuses more closely on ways of coping with the problems of creating and maintaining a viable identity in black community. Sula rejects all traditional social standards and tries to insist her own voice. But she is destined to be isolated even into death because the community's norms are crucial to her survival and development. Beloved differs from The Bluest Eye and Sula in that the emphasis shifts from external factors creating fragmentation toward internal healing processes that allow for psychic integration. The narrative through re-memory enables Sethe to recover fragmented self and bridge the gap between past and present. Morrison's novels articulate both the African American perspective that privileges double consciousness and the postmodern perspective in which traditional western insistence on unity must be replaced by multiplicity and dialogue. Working between, and within the terms of such traditional dichotomies as black/white, presence/absence, self/other, and past/present, she devises a new form of world view that is no longer based on homogeneity, but is founded on coexistence in difference. Morrison expands the limits of human consciousness beyond either-or mentality and presents double vision as strategy for survival of black in white America.

Spheroidal Coordinate System을 이용한 전류분포 해석 ( On the Analysis of Current Distribution by Using Spheroidal Coordinate System )

최재구,김정기 한국통신학회 1986 한국통신학회 학술대회논문집 Vol.5 No.2