보행속력과 동작의 부드러움과의 상관관계에 관한 연구

탁계래,한영민,최진승,이정한,임영태,전재훈,박상균,박승하,Stefanyshin Darren 한국운동역학회 2006 한국운동역학회지 Vol.16 No.1

초고속 전송에 대한 Ultrashort Laser Pulse의 새로운 스펙트럼 분석

전진성,조형래,오용선 韓國海洋大學校電波通信硏究所 1999 電波通信硏究所論文集 Vol.1 No.-

본 논문에서는, Class-2 PRS 모델의 전달함수인 Raised-Cosine 펄스를 이용하여 극초단 레이저펄스의 전송특성을 분석하였다. 이는 Class-1 PRS 모델에서와 같이 부분응답시스템의 수정된 모델로부터 얻어지는 고차원펄스를 이용하여 그 차수의 증가에 따라 FWHM폭이 현저히 감소하여 분석하고자 하는 극초단펄스의 형태에 근접하는 펄스를 제시하였으며, 그 스펙트럼과 전송대역폭도 차수에 따라 일률적으로 유도되므로 Gaussian, Sech형태의 펄스 같은 고전적인 방법과는 달리 광범위하고 정확한 전송특성을 분석하는데 매우 유용함을 밝혔다. 먼저, 부분응답시스템의 일반적인 모델을 수정하여 어떤 형태의 고차원펄스도 적용할 수 있는 새로운 방법을 제안하였다. 그리고 제안된 모델을 이용하여 어떠한 형태의 FWHM을 가지는 극초단펄스의 전송에 대한 새로운 분석 방법을 제안하였다 제안된 방법을 사용하여, 설정 펄스 폭을 τ=1(㎰)으로 설정, 고차원펄스의 차수 n=1~100에서 얻어지는 FWHM 1(㎰)~100(fs)의 극초단펄스의 스펙트럼을 제시하였고, Class-2 PRS 모델의 FWHM 폭이 Class-1 PRS 모델보다는 차수 n에 따라서 약 50~100(fs)정도 좁은 FWHM 폭을 가짐을 밝혔다. 이에 대한 전송특성은 레이저펄스의 보편적인 신호방식인 Unipolar 체계로 설정하여, 가능한 펄스간격에 따른 PSD를 유도하여 제시하였다. 이러한 결과들은 고전적인 실험 방법과는 일치함을 물론 미래 극초단펄스 연구에 대한 혁신적인 방법으로 사용될 수 있을 것이다. In this paper, we analyze transmission characteristics of ultrashort laser pulses using the property of Raised-cosine pulse which are systematically obtained following Class-2 PRS model. The high-order pulses are easily derived from a modified PRS system model as Class-1 PRS model. This may be based on the fact that the spectra and bandwidths of the high-order pulses are beautifully related to their orders. And we make clear they are very useful to cover wider area and more accurate transmission characteristics of ultrashort pulses than Gaussian or Sech pulse approximations used conventionally. First modifying the generalized PRS system model, we propose a new model for deriving any type of high-order pulse. And we offer a novel analysis method of ultrashort pulse transmission which has any shape and FWHM, using the proposed model. In addition, by fixing the pulse range τ=1(㎰) and varying the order of the pulse from n=1 to n=100, we obtain spectra of ultrashort pulses with 1(㎰)~100(fs) FWHM's, and width of FWHM in the Class-2 PRS model 50~100(fs) smaller than Class-1 PRS model. As a one-step further, we derive PSD's of their pulse trains when they are applied to Unipolar signaling scheme. These PSD's are decided in the range of possible pulse intervals. All of these results are not only coincided with some conventional experimental works but also will be applied to any pioneering ultrashort pulse in the future.

개방형 원심압축기에서의 틈새크기에 따른 유동특성에 관한 실험적 연구

김진형,조강래 연세대학교 산업기술연구소 1994 논문집 Vol.26 No.2

The Pressure loss due to leakage flow is directly related to the tip clearance size of centrifugal impeller. The performance and the pressure distribution along the shroud casing are measured by using pressure transducer system for unshrouded centrifugal compressor at different size of tip clearance. The characteristic curves With respect to the size of tip clearance are presented as one curve regardless of rotational speed. As the size of tip clearance increases form 0.5mm through 2.0 mm, the values of pressure coefficient of characteristic curves decrease linearly due to the increase of leakage loss. The reduction rate of static pressure coefficients per 1 mm tip clearance is 0.04∼0.047, and the reduction rate per c/b₂is 0.28 evenly. The pressure coefficient for radial direction on the shround casing surface is presented as one curve regardless of rotational speed and decreases linearly. The reduction rate of pressure coefficient is nearly identical to that of characteristic curves.

규폐증 2예

손진군,노종래,송혜란,김진하 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

Silicosis is a chronic diffuse interstitial fibronodular lung disease caused by long-term inhalation of dust containing free crystalline silica. Silicosis does not occur by trivial exposure but requires long-term inhalation of high dose of silica. We experienced two cases of Silicosis. According to the examination of the medical records of the two cases including their symptom, exposure duration. International Labour Office(ILO) 1980 Classification and Pulmonary Function Test(PFT), the patient in the frist case had coughing with sputum, 15-year long exposure, Category A, Forced Vital Capacity (FVC) 69% and Forced Expiratory Volume for I second (FEVI) 69%, and the patient in the second case had no symptom, 2-year long exposure, Category B, FVC 96% and FEVI 77%.

排球 選手의 스포츠 傷害에 관한 調査 硏究 : 女子高等學校 先手를 中心으로

김진묵,박정래 公州大學校스포츠科學硏究所 1998 스포츠科學硏究所論文集 Vol.- No.12

This research was performed in an effort to investigate injuries related volleyball. Specifically this study focused on the types, causes and remedies of injuries. The research sample consisted of one-hundred and one female volleyball players. The players were selected from girls' high schools. The results obtained wee as follows: 1. There were a total of 1.379 injuries. (The average person being injured 13,7 times.) 2. The frequency for injuries was ankles 491 times935,17%), wrists 294 times(21,06%), shoulder 264 times(18,91%), knees 224 times(16,05%). 3. The kinds of injuries are strain 303 times (44.09%), contusion 225 times(33,04%), arthritis 76 times(11,16%), sprain 35 times(5,14%), abrasion 17 times(2,50%), dislocation 15 times(2,20%). strain and contusion made up 77,13% of all injuries. 4. The causes of injuries are: insufficient sleep 224 times(24.86%), training during their menstrual period 151 times(16,76%), lack of training 154 times(17,09%), and Fatigue 137 times(15,21%) 5. The remedy for injuries were direct pressure therapy and physical therapy form 40,69%, acupuncture 30.44% orthopedic treatment 22,07%. 6. The recovery period: 15 cases recovered within 4 weeks, and 36 cases recovered within 5 weeks. 7. Most of injuries happen in games (47 times), main training (20 times), adaptation training(14 times) From the above results, I suggest that every trainer should 1. Have knowledge about injuries and their causes. 2. Ensure that each player receives proper rest and warm up period. 3. Have knowledge on the prevention and treatment of injuries related to volleyball.

비선형 파라메터를 이용한 마이크로파 발진기 위상 잡음 해석에 관한 연구

강진래,이영철 경남대학교 공업기술연구소 2001 硏究論文集 Vol.19 No.-

본 논문은 HEMT의 비선형 등가소자에 의한 마이크로파 발진기의 위상잡음에 미치는 영향에 대해서 분석하였다. 능동소자의 비선형 등가회로에서 비선형 커패시턴스 Cgs, Cgd를 중심으로 발진기의 위상잡음에 미치는 영향을 최적화 시켰으며, 마이크로파 발진기가 저 위상잡음을 가지도록 병렬귀환의 유전체 공진발진기를 설계하고 마이크로파 샘플링 위상 검파를 이용한 고안정 위상동기 발진기를 설계하여 분석한 결과, 실제 제작하여 측정된 위상잡음은 -80.33dBc@10KHz 및 -95dBc@100KHz으로 이론값과 실험 값이 매우 근접함을 알 수 있었다. With the nonlinear equivalent circuits of microwave HEMT, we analyzed the most affected nonlinear elements to the phase noise of microwave oscillator are capacitance between gaffe to source and gate to drain. the nonlinear elements of capacitances of Cgs and Cgd, have been optimized to reduce the phase noise of microwave oscillator by analysing of scattering parameters of device. The designed microwave oscillator, Dielectric-resonant microwave oscillator of high quality and low phase noise, is phase locked loop adapted the microwave sampling phased locked oscillator and shows a good agreement to the measured phase noise of -80.33dBc and -9565c offset frequency of 10KHz and 100KHz at 13.25GHz respectively.

면/저마 혼방편성물의 드레이프성에 관한 연구

李德來,任珍模 全北大學校 1996 論文集 Vol.42 No.-

The purpose of this study was to determine the relaxation condition, hem length and mixing ratio of ramie fiber of knitted fabric on the drapability and mechanical properties. Twelve cotton/ramie knitted fabrics were produced with different maxing ratio of ramie fiber and stitch for this study. Mechanical properties such as tensile, shearing, bending compressional property of twelve cotton/ramie knitted fabrics including surface property, thickness and were measured by KES-system on knitting condition. The experimental results were statistically analyzed to investigate the effect of drape coefficient, functional values and mechanical properties by maxing ratio of ramie fiber.

미니에멀젼 중합을 이용한 상전이 물질의 나노 캡슐화 및 열적특성 연구

김경래,백경현,신진섭,김중현 한국공업화학회 2004 응용화학 Vol.8 No.2

The nanocapsule containing phase change materials (PCM) such as octadecane were prepare by miniemulsion polymerization. The size, shape, and encapsulation efficiency of PCM nanocapsule was analyzed by scanning electron microscope (SEM), transmission electron microscope (TEM), hydrodynamic fractionation (CHDF), differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). PCM nanocapsule size range from 50 to 100 ㎚, and its morphology was shapes. The maximum encapsulation efficiency of PCM materials were around 90%.

협력학습을 통한 수학 학습부진아 지도

홍진곤,조승래 한국수학교육학회 2003 수학교육 Vol.42 No.3

This study analyzes the effectiveness of cooperative learning in the instruction of the underachieved students. The result of this study showed that students who participated in the cooperative learning tended to exert positive effects on the cognitive and affective(interest, self-confidence, motivation) domains. In the cooperative learning, the underachieved students were encouraged in mathematics learning and improved the efficiency of learning in mathematics.

형상기억복합재료에 대한 온라인 모니터링 시스템 개발

이동화,박영철,이민래,이동화,이규창 한국비파괴검사학회 2003 한국비파괴검사학회지 Vol.23 No.1

형상기억복합재료를 제조하기 위하여 핫프레스 방법을 이용하여 최적의 제조조건을 도출하였으며 냉간압연에 의해 기지재와 강화재의 계면접합을 강화하여 강도를 증가시켰다. 이러한 방법에 의해 제조된 형상기억복합재료에 대하여 외부 하중에 의한 손상정도와 균열의 발생을 감지하여 균열 발생 및 진전을 억제하는 온라인 모니터링 시스템을 개발하고자 한다. 이를 위하여 음향방출 신호의 파라미터를 이용하여 손상에 따른 최적의 AE 파라미터를 도출하였으며 가열시스템을 이용하여 형상기억합금을 가열함으로써 형상기억합금의 수축에 의한 복합재료 내부에 균열진전을 억제시키는 시스템을 개발하였다. A hot press method was use for the optimal manufacturing condition for a shape memory alloy(SMA) composite. The bonding between the matrix and the reinforcement within the SMA composite by the hot press mothod was strengthened by cold rolling. In this study, the objective was to develop an on-line monitoring system for the prevention of the crack initiation and propagation by shape memory effect of SMA composite. Shape memory effect was used to prevent the SMA composite from cracking. For the system to be developed, an optimal AE parameter should be determined based on the degree of damage and crack initiation. When the SMA composite was heated by the plate heater attached at the composite, the propagating cracks appeared to be controlled by the compressive force of SMA.