Siriraj Stroke Score 따른 뇌졸중 환자 감별의 적합성

유병대,이명갑,서영조,조준,박찬상,이동필 대한응급의학회 2000 대한응급의학회지 Vol.11 No.4

Background: The differentiation between hemorrhagic(HS) and norhemorrhagic(NHS) stroke is the most important first step in the management of acute stroke because clinical management of the two disorders differs substantially. Neuroimaging studies are useful in diagnosing and distinctioning between HS and NHS. The use of clinical variables, such as Siriraj stroke scores(SSS), has led to good sensitivity, specificity and predictive values. The aim of our study was to evaluate the use of the SSS in the Korean population and assess whether it could aid to expedite treatment decisions. Methods: We reviewed 111 cases of stroke patients admitted to our hospital via the emergency department over a 6 months period from July to December 1998. Levels of consciousness, vomiting, headache, and atheroma markers used in the SSS were applied to these patients who met the criteria for a stroke. Results: Of the 111 patients, the SSS classified 83 with sensitivities of 81.1%(NHS) and 73.3%(HS) and positive predictive values of 84.3% and 68.8%, respectively. The overall accuracy rate was 78.3%. Conclusion: Our results suggest that the SSS is not reliable in distinguishing stroke types in the Korean population. Definite neuroimaging studies are needed prior to thrombolytic therapy.

유압관로의 주파수변화 따른 압력전파특성

유영태,나기대,김지환 한국공작기계학회 2002 한국생산제조학회지 Vol.11 No.2

In this paper, an oil hydraulic pipeline is terminated by both rotary sinusoidal flow generator at upstream and oriffice at down stream. The pulsating pressure wave form, generated by the rotary sinusoidal flow generator, is measured by pressure sensor. In the analysis of this paper, a component of the fundamental frequency is obtained by using Laplace transformation. The experimental and analytical results make clear that (1) viscosity is significant role in hydraulic pipe. (2) When pulsating frequency is matched with the natural frequency, resonance frequency occurred periodically. According to the study proposed here, dynamic pressure in a circular oil pipe is expressed in propagation of pressure wave with respect to frequency and Bessel function. The resonance frequency is 108Hz at oil temperature 20℃ in this study. The abrupt change of gain value id due to effect of resonance frequency. The results of experiment are compared with the calculated results, and agreement of both results is fairly good.

한국공연예술의 자료개관 및 연구현황

유영대 고려대학교 한국학연구소 1996 한국학연구 Vol.8 No.-

유압관로의 임피던스 전달특성

유영태,나기대,모양우,김지환 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.2

Design for quite operation of fluid power system requires t h understanding of noise and vibration characteristics of t h system This paper presents a dynamic response of design of hydraulic circuit. Experimental investigations on the attenuation characteristics of pressure ripple in automotive power steering hydraulic pipe with dynamic response of hydraulic pipe line is examined.

한국문화와 장인의 미학

유영대 고려대학교 한국학연구소 1998 한국학연구 Vol.10 No.-

정사각 덕트의 출구 영역에서 속도분포에 대한 실험적 연구

유영태,모양우,나기대,임인호 朝鮮大學校 機械技術硏究所 2002 機械技術硏究 Vol.5 No.2

A numerical simulation has been performed with the non-linear turbulence model proposed by Speziale(1987) coupled with the k-ε equations coming from the renormalization group theory(RNG) derived by Yakhot et al(1992). The fully developed turbulent flow through a straight square duct, involing secondary motion is simulated. This paper represent computations of the interaction between measurement and numerical computation of turbulent flow on velocity distribution of outlet region in a square duct. RNG turbulent model was adapted and compared with the experimental data and the result of Standard k-ε turbulent model. The predictions obtained with the RNG k-ε model show improvements when compared with the Standard k-ε model. Mean velocity, turbulence kinetic energy and Reynolds shear stresses are in quantitiative agreement with the experimental data. We feel that the RNG k-ε model suggested in this paper can be a useful turbulence model for practical engineering

모터구동 밸브 주기적 안전성 확인을 위한 중요도 분류

강대일,성태용,김길유 한국산업안전학회 2002 한국안전학회지 Vol.17 No.2

Safety-related motor operated valve(MOV) safety significance for Ulchin Unit 3 was categorized. The safety evaluation of MOV of domestic power plants affects the generic data used for the quantification of MOV common cause failure(CCF) events in Ulchin Units 3&4 PSA> Therefore, in this paper, MGL(multiple greek letter) parameter β, used for the evaluation of MOV CCF probabilities in Ulchin Units 3&4 probabilistic safety assessment(PSA), was re-estimated and the MOV safety significance was categorized. The re-estimation results of MGL parameter show that the value of(is decreased by 30% compared with the current value used in Ulchin Unit 3&4 PSA. The categorization results of MOV safety significance using the changed value of MGL parameter(show that the number of HSSCs(high safety significant components) is decreased by 54.5% compared with those using the current value of it used in Ulchin Units 3&4 PSA>

성인 원발성 초점성 사구체 경화증의 예후인자

송영수,최훈영,유태현,강신욱,이중민,정현주,이호영,한대석,최규헌 대한신장학회 2004 대한신장학회잡지 Vol.23 No.1

유압관로에서 비정상 압력측압공의 동특성에 관한 연구

나기대,유영태,김지환 조선대학교 에너지.자원신기술연구소 2000 에너지·자원신기술연구소 논문지 Vol.22 No.2

In this study, the analysis of the dynamics characteristics and performance investigation of the pressure measurement in the hydraulic pipe. The exact solution of the frequency response is obtained by using the complicated transfer function. The discrepancy with the exact and the approximate is small, so the approximation solution is adopted to compare the experimental result with the theoretical analysis. The pressure measurement in the hydraulic pipe is caused by length of capillary and according to the end volume size. The experimental and calculate result show that characteristic of the pressure .measurement in the hydraulic pipe varies with the length of capillary and volume size. Therefore present theoretical formulation and experimental result can be used generally in designing and performance evaluation of all the hydraulic pressure measurement in the hydraulic pipe

싸이클 경기에서의 타임 트라이얼 성적과 크리티컬 파워와의 관련성 분석

고영완,신대철,류기성,강은균 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study is to examine whether or not critical power of first class cyclists is proper as index for checking aerobic ability and also to review its relationship with outcome of time trial. Fourteen first class cyclists participated in this experiment. In the laboratories their own new record of 40 ㎞ time trial (60.4 +/- 1.9 minutes) during the season and time trial record of 17 ㎞ were measured. Maximum oxygen consumption amount and aentilatory threshold value were obtained from exercise under maximum gradual load. Critical power was calculated from hours of continuous exercise obtained from 4 kinds of load. Value of critical power, aentilatory threshold value and volume of maximum oxygen consumption were respectively 300 +/- 24W, 3623+/-440mℓ/min. and 4612+/- 236mℓ/min, and on the basis of body weight it was 4.2M/㎏, 49.5mℓ/㎏/min and 64.7mℓ/㎏/min. Critical power showed high level of relation with maximum volume of oxygen consumption and aentilatory threshold value. It showed that critical power can become an index of aerobic ability of first class cyclists. the interrelationship between critical power and 40 ㎞ and 17 ㎞ time trial record was stronger than that of interrelationship between maximum oxygen absorption volume and aentilatory threshold value and 40 ㎞ and 17 ㎞ time trial. Based on the result mentioned above it could be concluded that critical power enables aerobic ability of first class cyclist in a relatively simple way and also critical power had high level of relationship with result at time trial.