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신원준,박영민,정동원,홍진우,선종주,이준우,정우상,박성욱,문상관,박정미,고창남,조기호,김영석,배형섭,Shin, Won-Jun,Park, Young-Min,Jeong, Dong-Won,Hong, Jin-Woo,Sun, Jong-Joo,Lee, Jun-Woo,Jung, Woo-Sang,Park, Seong-Uk,Moon, Sang-Kwan,Park, Jung- 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.1
The object of this study was to examine the relationship between arteriosclerosis and oriental medical diagnosis of the patients who had suffered ischemic stroke. The degree of arteriosclerosis of the patients was assessed by cardio-ankle vascular index(CAVI), and diagnostic criteria used for all patients were deficiency of ki, deficiency of blood, blood stasis and stagnation of water. One hundred four patients were included and their general characteristics, CAVI and oriental diagnosis were evaluated. Results showed a significantly strong correlation between CAVI and blood stasis. These results suggest a close relationship between arterioslcerosis and blood static syndrome as defined by oriental medicine. If so, diagnosis of blood static syndrome is a reilable predictor of arteriosclerosis.
향상된 콘크리트 동적거동 전산모사를 위한 수정된 RHT 콘크리트 모델 구성
신원준(Won Jun Shin),박휘산(Hwisan Park),한지훈(Jihoon Han) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.4
화약폭발이나 물체간 고속충돌과 같은 동적거동은 대변형을 유발하는 비선형성이 큰 문제이다. 이를 실험적으로 진행하기에는 비용과 시설 규모 등의 문제로 어려움이 따른다. 최근에는 전산역학의 발전으로 복합한 물리현상을 전산해석을 통해 평가할 수 있다. 콘크리트 재료의 동적거동을 거시적인 수준에서 표현할 수 있는 고급탄소성모델인 RHT 콘크리트 모델은 주로 방호벽이나 원자로 등의 구조물 폭발 및 충돌해석에 이용된다. 이러한 동적거동을 분석하기 위해서는 재료의 역학적인 거동을 수학식으로 표현할 수 있는 재료모델이 요구된다. 기존 연구들은 잔류강도의 과대평가로 인해 경화현상을 보이거나 변형률 속도에 따른 동적증가계수가 보수적으로 고려되어 동적인장강도가 낮게 평가되었다. 본 연구에서는 User-subroutine을 통해 개선된 모델을 바탕으로 잔류강도를 응력상태에 따라 조정할 수 있도록 매개변수를 추가하였고 변형률 속도에 의존하는 동적증가계수 수식을 수정하였다. 따라서 본 연구는 다양한 동적 하중 스케일에 따라 재료의 항복강도를 설정할 수 있도록 동적증가계수를 고려하고 이를 User-subroutine을 활용하여 수정된 수치모델을 제안한다. 제안된 모델의 검증을 위해 탄두 충돌 및 관통에 관한 두 가지 실험데이터에 대하여 전산 모사를 수행하였으며, 관통 깊이와 잔류속의 실험데이터와 비교분석을 통해 기존의 RHT 콘크리트 모델에 비하여 향상된 전산해석 결과를 확인하였다. Dynamic behavior, which related to gunpowder explosions or high-speed collision between objects, is a nonlinear problem that causes large deformations. It is difficult to conduct this experimentally due to problems such as costs and facility size. Recently, with the development of computational mechanics, it is possible to evaluate complex physical phenomena through numerical analysis. The RHT concrete model, an advanced elastoplastic model that can express the dynamic behavior of concrete materials at a macro level, is mainly used for explosion and collision analysis of structures such as protective walls and nuclear reactors. In order to analyze these dynamic phenomena, a constitutive model that can express the mechanical behavior of the material in a mathematical formula is required. Therefore, the modified model with User-subroutine added parameters to adjust residual strength according to stress states and modified the dynamic increase factor formula dependent on strain rate. Therefore, this study considers dynamic increase factors to establish the yield strength of materials according to various dynamic load scales and proposes a modified constitutive model by the implementation of User-subroutine. To verify the proposed model, numerical examples were performed on two experimental data related to warhead impact and perforation into concrete targets, and through comparative analysis with experimental data such as penetration depth and residual velocity, we confirmed improved results compared to the results of the original RHT concrete model.
우황청심원(牛黃淸心元)이 정상인의 혈압(血壓), 맥박수(脈搏數), 뇌혈류(腦血流) 및 뇌혈관반응도(腦血管反應度)에 미치는 영향(影響)
윤상필,이상호,김은주,나병조,정동원,신원준,문상관,배형섭,김이동,Yun, Sang-Pil,Lee, Sang-Ho,Kim, Eun-Ju,Na, Byong-Jo,Jung, Dong-Won,Shin, Won-Jun,Moon, Sang-Kwan,Bae, Hyung-Sup,Kim, Lee-Dong 대한한방내과학회 2004 大韓韓方內科學會誌 Vol.25 No.3
Objectives: Uwhangchungsim-won(UC) has been used in the treatment of a wide variety of conditions including stroke, hypertension, arterosclerosis, autonomic imbalance, and mental instability, in Korean traditional hospitals. The aim of this study was to evaluate the effect of DC on cerebral hemodynamics and to determine the appropriate dosage. Methods: We studied changes in hyperventilation-induced cerebrovascular reactivity and mean blood flow velocity of the middle cerebral arteries(MCAs) were studied by means of transcranial Doppler ultrasound. Changes in mean blood pressure, pulse rate and expiratory CO2(PECO2) were observed using Cardiocap TM/5. Six healthy young volunteers who were administrated with full doses of DC for group A, and half doses for group B. Six other healthy subjects comprised the control group. The evaluation was performed during basal condition, and repeated at 20, 40, 60, 120, and 180 minutes after administration. Results: Increases of cerebrovascular reactivity and mean blood flow velocity in the middle cerebral artery in group A were significantly different compared with group B and the control group (p<0.1). Mean blood pressure, pulse rate and expiratory CO2 did not change during the observation and were not different among these three groups. We observed that in cerebrovascular reactivity induced hyperventilation, group A was most effective at 40 minutes after administration, and its effectiveness lasted for 120 minutes. Conclusions: This study provides evidence for UC, in full doses, as an agent for dilation of the cerebral arteriols to increase hyperventilation-induced cerebrovascular reactivity as a consequence of faster recovery of blood flow velocity.
연구개발과제의 직후평가항목에 대한 인식도 조사: 기업부설 연구소를 대상으로
이무신 ( Mu Shin Lee ),손병호 ( Byoung Ho Son ),엄기용 ( Ki Yong Om ),신원준 ( Won Jun Shin ),전현곤 ( Hyun Kon Chun ) 기술경영경제학회 1995 Journal of Technology Innovation Vol.3 No.1
This paper addresses three central decision-making problems frequently encountered in developing evaluation checklists for ex-post evaluation of R&D projects at private R&D centers: 1) what kind of evaluation elements and factors should be included in the evaluation forms? 2) how much weight should be assigned to each evaluation factor and element? and 3) could the same evaluation elements and factors with their weights he applied across all the project types(research, development, and engineering)? To answer these questions, we identified the evaluation elements/factors based on the review of relevant literature and measured the perceptions of researchers, R&D managers, and top managements of the three private R&D centers to get the information about the importance levels of the elements and the weights of the factors for each of the three project types, The findings include that 1) all the evaluation elements derived from the literature exhibited high importance levels, and 2) the importance levels of the elements and the weights of the factors were quite varied along the project types. Theoretical and practical implications of the findings for ex-post evaluation of R&D projects are discussed.
청폐사간탕(淸肺瀉肝湯)이 급성기 중풍환자의 동맥경직도 및 맥압에 미치는 영향
박영민,홍진우,신원준,정동원,김석민,배형섭,김영석,문상관,정우상,조기호,Park, Young-Min,Hong, Jin-Woo,Shin, Won-Jun,Jeong, Dong-Won,Kim, Seok-Min,Bae, Hyung-Sup,Kim, Young-Suk,Moon, Sang-Kwan,Jung, Woo-Sang,Cho, Ki-Hoo 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.2
Objectives : Arterial stiffness and pulse pressure are related to cardiovascular and cerebrovascular survival and longevity. This study is aimed at examining the effects of Chungpyesagan-tang on arterial stiffness and Pulse pressure in acute stroke Patients. Methods: The subject of this study was acute strike Patients within 1 week after ictus, with Cardio-ankle vascular index(CAVI) higher than 9.0. They were divided into two groups: A treatment group (n=44) and a control group(n=46). For two weeks, Chungpyesagan-tang was given to the former, other herbal medicines to the latter. used for stroke patients for the control group for 2 weeks. At the end of first and second week, CAVI, pulse Pressure, National Institute of Health stroke scale(NIHSS), Modified Barthel Index(MBI) were measured. Serum lipid Profile, aspartate transaminase(AST), alanine transaminase(ALT). blood urea nitrogen(BUN), creatinine were also measured at the end of the study. Results : After 2 weeks, CAVI and Pulse Pressure in Chungpyesagan-tane group were significantly tower than those in the control group(P<0.05). NIHSS and MBI were improved in both groups. But there was no significant difference between the treatment group and the control group in terms of the NIHSS and MBI. Conclusions : We suggest Chungpyesagan-tanghas desirable effects on arterial stiffness and Pulse Pressure of acute stroke patients. It can improve morbidity and mortality of patients on the basis of influencing vascular stiffness and increased pulse pressure.
뇌경색(腦硬塞) 환자(患者)의 운동장애(運動障碍)에 대(對)한 2Hz와 120Hz 전침(電鍼) 치료(治療)의 효과(效果) 비교(比較) : 운동유발전위검사를 통한 비교
홍진우,최창민,박영민,신원준,정동원,박성욱,정우상,박정미,문상관,고창남,조기호,배형섭,김영석,Hong, Jin-Woo,Choi, Chang-Min,Park, Young-Min,Shin, Won-Jun,Jeong, Dong-Won,Park, Seong-Uk,Jung, Woo-Sang,Park, Jung-Mi,Moon, Sang-Kwan,Go, Chang-Na 대한한방내과학회 2006 大韓韓方內科學會誌 Vol.27 No.1
Objectives : Electrical acupoint stimulation(EAS) has been used to treat motor dysfunction of stroke patients with reportedly effective results. The purpose of this study is to evaluate the efficacy of the EAS with different frequencies in treating motor dysfunction of ischemic stroke patients. Methods : The subject of this study were forty-two ischemic stroke patients with motor dysfunction in Kyunghee oriental medicine hospital who were hospitalized for one week to one month from onset. They were treated with 2Hz or 120Hz EAS for two weeks, and motor evoked potentials(MEP) were measured before and after EAS treatment. To compare the effect of 2Hz EAS with 120Hz, the number of patients who showed MEP responses after two weeks among those who had no previous response was checked. Also measured were latency, central motor conduction time(CMCT), amplitude of MEP before and after EAS treatment. Results : After two weeks of treatment, 4 out of 15 patients(27%) in the 2Hz EAS group and lout of 19 patients(5%) in the 120Hz group showed potential responses. Yet there was no significant difference between the two groups. When MEP data of the affected side between the 2Hz group and the 120Hz group was compared, the former showed more significant improvement than the latter in latency, CMCT and amplitude(P=0.040, 0.019,0.021). When the proportion of the affected side and unaffected side in MEP data was examined, the 2Hz group showed improvement on only latency and CMCT with significant differences(P=0.040, 0.014). Conclusions : These results show that EAS with low frequency is more helpful for motor recovery after ischemic stroke than that with high frequency. This suggests that low frequency EAS activates the central motor conduction system better than high frequency EAS.