Microstrainer 설계를 위한 개량여과 이론

김병조,Qasim,Syed R,Verma,Rameshwar D 한국화학공학회 1971 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.9 No.3

The use of microstrainers in the water and wastewater engineering field is expected to increase in the future. Currently employed design methods for microstrainers are based on Boucher's straining law which assumes a constant rate of flow. The assumption of a constant pressure head is more appropriate than that of a constant flow rate. Governing equations describing the hydraulics of filtration through microstrainers based on these two assumptions are analyzed and compared.

한국 중산층의 정치의식

김병조,장원호 한국사회학회 2006 한국사회학회 기타간행물 Vol.- No.-

자가면역질환과 동반된 중증근무력증의 임상적 연구

김병조,고성범,박민규,박건우,이대희 대한임상신경생리학회 2001 Annals of Clinical Neurophysiology Vol.3 No.1

Background & Object : Myasthenia gravis(MG) is an autoimmune disease due to binding of antibody to acetylcholine receptors on the muscle membrane. It is well known that other autoimmune disease infrequently accompany myasthenia gravis. The aim of this study was to evaluate the clinical significance of associated autoimmune diseases(AAD) and compare prognosis between MG with AAD and MG without AAD. Method : A total of 65 MG patients(24 men and 41 women) were enrolled at this study. From the clinical records of these patients, we investigated the clinical characteristics and prognosis of MG with AAD and compared thses date with those of MG without other such disease. Results : AAD were found in 10 of 65 cases(15%). 9 cases of10 MG with AAD were generalized MG type. The most common disease was thyroid disorders. The rate of AAD was higher in thymic abnormal patients. There was no significant remission rate difference between MG with AAD and MG without AAD, but the percentage of patients experienced crisis was higher in MG with AAD. Conclusion : The occurrence of AAD may suggest a more generalized autoimmune disturbance that could be associated with a less favorable prognosis.

삶의 질 높이고, 초과근로 줄이고, 일자리 늘리는 탄력정원제 도입한 한국동서발전!

김병조 한국중소기업학회 2018 기업가정신과 벤처연구 Vol.21 No.3

The bigger, the better? An investigation of optimal volume of big data

김병조 economics bulletin 2017 economics bulletin Vol.37 No.2

풍압적분법의 유효성 검증에 관한 연구 II - 공력진동실험 결과와의 비교 -

김병조,하영철 한국풍공학회 2011 한국풍공학회지 Vol.15 No.4

바람에 의한 초고층 건축물의 거동은 매우 복잡하기 때문에 구조체에 대한 풍하중의 설계는 매우 어렵다. 현재 사용되고 있는 풍하중 산출방법은 풍동실험에 의존하고 있으며, 1차 탄성거동을 전제로 행해지고 있다. 가장 불리한 조건인 1차 모드로 가정하는 것은 다소 과대설계가 되어 안전하지만, 비경제적이다. 따라서 초고층 건축물에 작용하는 풍하중은 다차 모드 해석에 의해 산출하는 것이 안전성과 경제성을 동시에 확보할 수 있는 방법일 것이라 판단된다. 다차 모드를 고려한 풍하중의 산정은 풍압적분법(Pressure Integral Method)을 응용하면 가능하다. 본 연구는 풍압적분법(Pressure Integral Method)의 유효성을 검증하는 것이 목적이며, 공력진동실험에 의한 풍응답 해석결과와 비교하여 그 유효성을 검증하였다. It is difficult to estimate wind loads for super tall building. Because, behaviors of super tall building under wind actions are very complicated. Presently, estimation of wind loads on super tall building mainly rely on the wind tunnel test, and it is based on responding elastically. If super tall building was assumed to behave first mode of vibration, it is safe because of over-estimation of wind loads but it is unreasonable in economic efficiency. To gain both the safety and the economic efficiency of super tall buildings, the wind loads on super tall buildings shall be calculated more accurately to take into account dynamic behaviors of the multi-vibration modes. In this study, wind loads considered multi-vibration mode are analysed by using PIM(Pressure Integral Method). The purpose of this study is to verify the validity of the PIM by comparisons of the results on PIM to those of aerodynamic model test.

편마비환자의 정적 골반경사각에 따른 보행 비대칭율의 차이에 대한 연구

김병조,Kim, Byung-Jo 대한물리치료학회 2006 대한물리치료학회지 Vol.18 No.3

Purpose: This study was performed to determine the difference or temporal-spatial gait asymmetry ratio according to static pelvic inclination level in hemiplegic patients. Methods: The subjects were 25 hemiplegic patients who was experienced stroke on MCA territory. Gait parameters and static pelvic inclination were recorded by $GAITRite^{(R)}$ system and radiologic PACS. The subjects were divided into three group according to static pelvic inclination. In the group I, the subjects have static pelvic inclination below $58^{\circ}$. The group II has $58^{\circ}{\sim}62^{\circ}$ or static pelvic inclination and the group m has over $62^{\circ}$ or static pelvic inclination. The data or three groups were analysed with ANOVA. Results: In comparison or single support time asymmetry ratio among 3 groups, the score or group II was significantly higher than the other groups(p<0.05). But the swing time asymmetry ratio was not significant(p>0.05). Conclusion: Asymmetry ratio of single support time was statistically significant by static pelvic inclination level. But asymmetry ratio or group II was the highest among three groups. It means that the patients or normal range of pelvic inclination was showed the most asymmetry or gait. And swing time asymmetry ratio was not significant among three groups. Even if the patient has normal ranged static pelvic inclination, it doesn't suggest that the patient has low gait asymmetry.

Effects of Group Exercise Program on the Health Condition and Quality of Life in Adults with Cerebral Palsy

김병조 국제물리치료연구학회 2018 Journal of International Academy of Physical Ther Vol.9 No.3

This study examined the effects of group exercise program on health conditions and quality of life in cerebral palsy. Adults with cerebral palsy in their 20’s who participated in the evaluation of measurement tools prior to and following the experiment. The control group was engaged in manual exercise for the range of joint movement and extension exercise for arms, legs and trunk, and experimental group performed group exercise program including boccia exercise. The health condition and quality of life of the experimental group were significantly increased after intervention (.05<). There was a slight increase in the control group, however it was not statistically significant. As a result of comparing the health condition and quality of life of the two groups, the value of the experimental group was significantly higher than that of the control group. The results of this study suggest that exercise programs for patients with cerebral palsy in the twenties are considered as beneficial interventions to improve health conditions and quality of life.

Optimal Pricing Strategies for Open Source Support Providers

김병조 한국경영정보학회 2013 Asia Pacific Journal of Information Systems Vol.23 No.1

The market for commercial open souce software (OSS) has been rapidy growing with the proliferation of OSS. One way to commercialize OSS is the support model, which has been adopted by leading OSS firms such as Red Hat and JBoss. Despite the growing interest in OSS commercialization, little research has provided OSS support providers with a pricing guideline. In this paper, we examine the optimal pricing strategies for OSS support providers. Our benchmark is a monopoly case in which we investigate a startup software vendor’s incentive to choose the OSS support regime over the proprietary one. Then we extend the model to a duopoly case in which OSS under the support regime competes against proprietary software. We characterize the conditions under which the OSS support model is viable under competition. We believe that our results offer insights to the OSS vendors who consider commercializing their OSS with a support model.

풍향에 따른 풍압적분법의 유효성 검증에 관한 연구

김병조,하영철 한국풍공학회 2012 한국풍공학회지 Vol.16 No.4

It is difficult to evaluate wind load of irregular shaped buildings and tall buildings by using multiple degrees of freedom. Because, in general wind loads of those were estimated based on the first mode of vibration. These problems can be solved by using the Pressure Integral Method (PIM). The PIM is a method to estimate wind force of floors and it can be able to analyze wind load of irregular buildings and multiple degrees of freedom. However, If analysis of multiple degrees of freedom has been done by using PIM, there is no way to directly test the validity of a PIM. In prior studies to validate the PIM analysis for a wind direction, the linear mode was adopted as the vibration mode of the building. The results of the PIM analysis were then compared to existing wind tunnel tests (High Frequency Force Balance, and the Aeroelastic Model Test). As the results of these studies, it shows that the linear responses using PIM and the other methods were similar. However, the validation of PIM in according to variation of wind directions has not been investigated. Thus, this study is to verify the validity of PIM for wind directions. The results of PIM were compared to those of High Frequency Force Balance test. 현행의 비정형 건축물과 고층 건축물의 풍하중 평가방법은 건축물의 진동모드로 선형모드를 사용하고, 1자유도 해석을 수행하기 때문에 고차모드 및 다자유도 해석에는 한계가 있다. 이러한 한계를 극복하기 위해 개발된 방법은 풍압적분법이다. 풍압적분법은 층별 풍력을 산출하는 방법으로 비정형 및 다자유도 해석을 가능하게 한다. 하지만 풍압적분법에 의해 다자유도 해석을 수행할 경우 그 유효성을 직접적으로 검증할 수 있는 방법이 없다. 따라서 선행연구에서는 풍압적분법의 유효성을 검증하기 위해 건축물의 진동모드로 선형모드를 선택하여 하나의 풍향에 대한 풍압적분법과 기존의 풍동실험방법(풍력실험, 공력진동실험)에 의해 산출된 풍응답을 비교하였고, 그 결과 각 실험에 의한 풍응답이 모두 유사하게 나타났다. 선행연구결과는 하나의 풍향에 대한 결과이므로, 본 연구에서는 풍압적분법의 적용성을 높이기 위해 풍향변화에 따른 풍압적분법의 유효성 검증연구를 수행하였다. 그 검증대상은 풍력실험에 의해 산출된 풍응답과 비교하였다.