생후 등줄쥐의 대뇌겉질 및 줄무늬체에서 NADPH-diaphorase 양성신경세포에 관한 연구

황승준,이종환,홍혜남,이흥식,허영범,조정식 대한해부학회 1999 Anatomy & Cell Biology Vol.32 No.1

전자공학교육과 실험교과내용에 관한 연구

홍봉식,김태균,오승엽,김환우,권오석 충남대학교 공업교육연구소 1983 論文集 Vol.6 No.2(A)

The currenty offered experiment courses are completely reconsidered and reconfigured. The whole subjects are divided into 10 seperate courses, each of which should represent either basic or advanced stages of differing fields of the electronic engineering. It has been aimed that the courses form an elaborate hierachy so that they are minimally redundant but linked to one another in their fringes. Also, it has been pursued that the new courses should not fall obsolete in at last next five years exploring the maximum possibilities of the currently available equipments.

동아의 체중조절 효과

홍석산,이승환,김철용,권석형,황보식 한국식품영양학회 2002 韓國食品營養學會誌 Vol.15 No.4

본 연구에서 선발된 17종의 천연물을 Sprague- Dawley rat에 급여한 결과, 체중 증가, 에너지 소비, fat pads 중량, 간의 triglyceride 함량, atherogenic index 그리고 혈중 글루코오스의 함량 등이 감소하는 경향을 나타내었다. 특히 동아를 구강으로 섭취시킨 결과, 체중 증가, 에너지 소비, fat pads 중량, 그리고 혈중 글로코오스의 함량등이 감소하였으나, 간의 triglyceride 함량은 오디와 송엽의 열수 추출물보다 적게 감소하였다. 동아, 오디, 그리고 송엽을 혼합하여 사용한 결과, 각각의 원료를 사용할 경우보다 비만이 개선되는 것으로 나타났다. This study attempted to evaluate the effectiveness of function of Wax Gourd for obesity and the related disease of adult people can be developed by the combination of the 17 food materials screened in this study. The experiments using Sprague-Dawley male rats show that seventeen kinds of food material inhibited the increase of body weight gain, energy intake, fat pads weight, liver triglycerides content, atherogenic index, and blood glucose concentration induced by cafeteria diet. Oral administration of wax gourd decreased most body weight gain, energy intake, fat pads weight, and blood glucose concentration induced by cafeteria diet. Oral administration of wax gourd decreased most body weight gain, energy intake, fat pads weight, and blood glucose concentration. Liver triglycerides content was the lowest in the group administered mulberry stem extract and the group administered pine leaves showed the lowest atherogenic index. The combined administration of wax gourd, mulberry stem extract and pine leaves improved more the obesity and related symptoms than the individual administrations.

난황낭종 환자에서 보존적 수술 및 항암 화학요법 후 성공적인 자연임신

정은환, 홍승화, 박연진, 지일운, 김학순 충북대학교 의과대학 충북대학교 의학연구소 2012 忠北醫大學術誌 Vol.22 No.1

침윤성 난소암의 경우 생식력의 보존이 중요한 도전이라고 할 수 있다. 20대 중반의 여성에서 거대 한 난황낭종이 발견되어 생식력의 보존을 위해 보존적 수술과 복합항암화학요법을 시행한 후 임신 및 출산에 성공한 증례를 경험하였기에 문헌고찰과 함께 보고한다.

평탄 지역과 경계선 지역에 따른 적응형 필터를 이용한 스패클 잡음 제거에 관한 연구

홍승범,백중환 한국항공대학교 1996 論文集 Vol.34 No.-

본 논문에서는 경계선을 보호하면서 잡음을 제거하는 전 처리 방식을 제안한다. 초음파 영상은 과립(顆粒) 형태의 스패클 잡음에 의하여 열화된다. 스패클 잡음은 곱형 잡음(multiplicative noise)의 형태로서 신호에 독립(signal independent)적이며, 공간상에서 상관적이다. 우리가 제시한 방식인 이종형 필터는, 본 논문에서는 AWF(Adaptive Window Filter)로 부름, 스패클의 성질을 이용하여 제작하였다. 구성 형태는 에지 영역에서는 평균 필터를 이용하였고, 잡음 영역(flat region)에서는 Log필터를 이용하였다. 두 영역을 구별하는 방법은 기존에 제시된 통계적 연산 방식(국부 평균과 표준편차) 대신에 공간 영역 상에서 국부 창(3x3 subwindow)에서 얻어지는 기울기를 이용하여 두 영역을 구별할 수 있다. 제안된 필터의 성능 평가는 향상 지수 (??)와 스패클 지수(SI)에 의해 잡음의 제거 정도를 평가 하였다. In this paper, we propose a pre-processing method which removes noise while preserves the edges. The ultrasonic images are corrupted by the granular pattern noise-a speckle noise. the speckle exists in a types of coherent imaging systems, the speckle is the signal independent and multiplicative noise. In this paper, we derive a filter, called the AWF(Adaptive Window Filter), from the nature of the speckle. The filter is made of the MEAN Filter in the edge region and LOG Filter in the flat or noise region. To make a distinction between edge and flat region, we calculate the inclination around the subwindow(3x3) instead of computing the local statistics of pixels (such as local mean M and standard deviation ?). According to the obtained region, edgeregion is performed by the mean filter and flat region by the Log filter. Performance of the proposed filter is evaluated by the Enhanced Factor (??) and the Speckle Index(SI).

VLSI의 收率增大를 위한 PMOS IC 프로세스 진단에 관한 연구

홍완희,김창민,김철주,노승용,김성환 서울市立大學校 1987 論文集 Vol.21 No.2

In this paper, the PMOS IC process check through various fabrication processes were dicussed. The Si water used process was estimated by the surface cleanness and bulk crystalline properties. For the photolihography process and photomask fabrication, the process cleanness was estimated. The control technology of process parameters from process cleanness in oxidation, CVD(chemical vapor diposition), diffusion and Al evaporation process was described. To estimate synthetically the process, the MOS and planar diode and PMOS transistor array were fabricated, and then the maximun yield of IC was assumed by the minimum number of bad transistor and diode.

징병 신체검사에서 나타난 청소년기 추간반탈출증의 유병률과 임상적 특징 : A Study Based on Examinations for Conscription

홍창기,박철기,박형천,윤승환 대한척추신경외과학회 2004 Neurospine Vol.1 No.1

Objective: The authors analyzed the large series of intervertebral disc herniation in adolescence to evaluate the prevalence, clinical characteristics, and possible risk factors on the basis of the data from the examinations for conscription. Material and Methods: Of 77685 nineteen-old-males who were given an examination for conscription at Regional Military Manpower Administration of Seoul in 2002, 382 patients exempted from conscription due to intervertebral disc herniation were analyzed. The diagnosis were made from the medical certificate, medical record, magnetic resonance imaging(MRI)(or computed tomography(CT)) which examinee presented and confirmed with the aid of reexamination of CT. Radiological char cteristics and severity of intervertebral disc herniation as well as structural abnormalities of vertebral columns were carefully evaluated with CT scan and MRI scan. Possible risk factors like overweight, structural abnormality of vertebral column, trauma were analyzed statistically using one-sample T-test and chi - square test on the assumption that P value less than 0.05 was considered statistically significant. Result: Prevalence of intervertebral disc herniation in adolescence aged nineteen years and younger were 0.5%. L4-5 level was the most frequently affected site followed by L5-S1. Of all 382 patients of intervertebral disc herniation, 29% were considered serious with reference to radiological evidence of root compression or siginificant discogenic spinal stenosis. Limbus fracture was found in 6.8% of patients. Overweight was the significant risk factor of the disease(p=0.0). However, neither structural abnormality of vertebral column nor trauma showed any relation to pathogenesis of intervertebral disc herniation. Conclusion: In adolescence aged nineteen years and younger, the prevalence of intervertebral disc herniation was 0.5% and accompanying limbus fracture was more frequent when compared with adult. Overweight was the only significant risk factor of the disease.

3個의 耕耘날을 利用한 平衡振動式 耕耘裝置(Ⅴ) : 運動解析과 要因分析

金成泰,金容煥,崔圭洪,金成泰 慶尙大學校 1988 論文集 Vol.27 No.1

This is the fifth part of series of reports on the study on a blanced-type oscillating tillage implement using triple blades system. Previous reports were made on the characteristics of power requirement and vibration with which tillage implements were oscillated parappep and perpendicular to the travelling direction. In this paper, the locus and motion analysis of the tillage blade and factor analysis were carried out. Obtained results are as follows : 1. The loci od the blade edge were described as helix curve at vertical oscillation and as lacerated curve at horizontal oscillation to the soil bin movement. 2. The motion equations of blade edge are estimated as follows. Vertical forced vibration ?? ?? Horizontal forced vibration ?? ?? 3. The multiple regression equations for resultant oscillating acceleration draft, specific resistance, and torque were established by using frequency, amplitude, life angle of tillage blade, and velocity of carriage as indepentent vibrations, respectively. 4. By reducing the velocity ratio is increased providing higher effect of the reduced draft. But this effect contradicted to achieve the reduced osillating acceleration. Both effects should be considered simultaneously to find out the optimum operating condition. 5. The reduction effect of the oscillating acceleration was slightly favoured to the horizontal forced vibration type, but traction efficiency could be lowered due to the increased slippage. Therefore, it can be concluded that the vertical forced vibration type is more appropriate considering overall performances. 6. From the experimental results, the optimum operating conditions of the vertical forced vibration type are recommended as follow ; life angle 30 degree, operation velocity 0.15 metre per second, amplitude 4-6 millimetre, and frequency 22.5 hertz.

자율적 테스트를 위한 VLSI의 테스터블 설계

노승용,김철주,홍완희,김성환,김영호,민병현 서울市立大學校 1988 論文集 Vol.22 No.-

In this pater, new design method for VLSI fault test are proposed by using built-in self test technique. The ordering algorithm for effective test pattern generation and the design method multi-input signature analysis for improving the fault detection capability are suggested. Also, a new multi-function BILBO(Built In Logic Block Observer) is sugested to reduce the hardware. By involbing the latch of sequential circuit into the BILBO, Built In Self Test can be executed effectively. The above proposed multifunctional BILBO was designed to operate both at a test pattern generator and a signature analyzer for reduction of the additional circuit and test time. Moreover, by using input and output line of multifunctional BILBO as a common, the external terminal are saved and the internal chip wiring can be done easily, and also the propagation delay of data signal is not ocurred. Through the implementation of test pattern generation and reordering and algorithm and multifunctional BILBO with C-language on the VAX 11/750(UNIX) computer, the efficienty of algorithm and the availability of designed method are verified.

MPLS망에서 RSVP와 DiffServ연동모델의 성능분석

최승권,오구영,지홍일,신승수,조용환 충북대학교 산업과학기술연구소 2002 산업과학기술연구 논문집 Vol.16 No.1

The explosive growth of the internet traffic has imposed tremendous stress on routers, particularly, in the core network. Today's IP services reflect the unpredictable and undifferentiated packet loss and jitter characteristics of traditional best-effort routers. For above requirements, it is required not only the high-speed transmission of the packet, but the new routing function, the guarantees of QoS and bandwidth, the supports of user-requested services MPLS is proposed by the IETF and many other research institute as the solutions for this problem. In this paper, analyze performance of QoS Model applied RSVP over DiffServ to MPLS network. this model is each RSVP applied access network and DiffServ applied core network. In Result, It is amiss that basis MPLS net uses to core network because the average packet loss rate and average delay time are increased if traffic increases. Experiment result was seldom difference in case of network that apply each RSVP, DiffServ, RSVP over DiffServ. RSVP over DiffServs case packet loss rate and delay time were low than DiffServ and the packet loss rate is high because comparing than RSVP but delay time was very low.