• 대한한방내과학회지
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• 제36권3호
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• pp.284-296
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• 2015

Objectives: The purpose of this study was to examine the effects of Ohmae-hwan (OMH) and Mume Fructus (MF) on inflammatory bowel disease (IBD). Methods: Mice were divided into 4 groups: a normal group, control group, MF group, and OMH group. Three groups, excluding the normal group, were fed a 5% solution of dextran sulfate sodium (DSS) in water for 10 days to induce inflammatory bowel disease. From the fourth day of DSS treatment, the control group was given distilled water only, the MF group was given MF powder in distilled water, and the OMH group was given dried OMH extract powder in distilled water for 7 days. Results: For each animal, changes in body weight, colon length, and component levels in blood and colon tissues after each treatment were noted. The weight in the control group and MF group decreased slightly compared with that in the OMH group, and the colon length in the MF group and OMH group was more than that in the control group. TNF-α and WBC were decreased in both the MF group and the OMH group. RBC was increased in the OMH group, like in the normal group, compared with the control group and MF group. Hb and PLT of each group were not significantly different. Regarding changes in the colon tissues, both the MF group and OMH groups recovered similar to the normal group. Conclusions: Thus, treatment with OMH and MF seems to be effective against inflammatory bowel disease, and OMH is likely to increase body weight and induce RBC recovery better than MF.

• 대한한의학회지
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• 제29권3호
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• pp.50-62
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• 2008

Objectives: This study was aimed to find the effect of Samiunkyungtang on inflammation and microflora in an ulcerative colitis animal model. Methods: We established four groups of normal, control, test 1, and test 2 and assigned 6 rats toeach group. The normal group was not treated by any process and fed by normal saline. The control & test groups were provided with 4% dextran sodium sulfate (DSS) treatment for 7 days. Samiunkyungtang extract was orally administered to test groups (test 1=25mg/kg, test 2 100mg/kg) 3 days after DSS treatment for 10 days. After DSS treatment finished, we sacrificed the mice and measured colon length and enzyme activities such as myeloperoxidase (MPO), alkine phosphatase (ALP), ${\beta}$-glucuronidase, ${\beta}$-glucosidase, chondroitinase, and tryptophanase. Results: The colon lengths of test 1 and 2 groups were longer than the control group (p<0.05). Histologically, the crypts and superficial epitheliums of test 1 and 2 groups were regenerated. Goblet cells from all test groups were retrieved. The inflammatory biochemical marker, MPO and ALP activities in all test groups were highly reduced (p<0.01) compared to the control group. The activities of fecal bacterial enzymes in test groups such as ${\beta}$-glucuronidase, ${\beta}$-glucosidase, chondroitinase, and tryptophanase were reduced compared to the control group (p<0.01). Conclusions: As a result of this experiment, Samiunkyungtang is considered to have an inhibitory effect on inflammation and fecal enzyme activity in DSS-induced colitis animal model. Our results indicate that Samiunkyungtang may possess therapeutic effect on the development of DSS-induced colitis.

• 한국산업보건학회지
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• 제19권3호
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• pp.240-249
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• 2009

HRSG(Heat Recovery Steam Generator) building is large enclosed structure included various heat sources. This building needs to appropriately keep internal air temperature for worker's safety and operability of control devices. In this study, ventilation analysis is performed to find proper ventilation method for temperature control. Ventilation analysis is applied to entire internal space of the building with standard $k-{\varepsilon}$ model and enhanced wall treatment because of large size of the structure. And the ventilation method is considered natural and forced convection with two louver structures which has damper or not. Louver structure affect directly air circulation in near HRSG and lower region of the building. Forced ventilation provides strong inertial force which cause upward airflow. From the analysis, it is found that design requirement for internal air temperature can be satisfied by forced ventilation method with louver structure without damper.

• International Journal of Control, Automation, and Systems
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• 제6권2호
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• pp.243-252
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• 2008

It has been reported that long-term exercise on a treadmill (running machine) may cause injury to the joints in a human's lower extremities. Previous works related to analysis of human walking motion are, however, mostly based on clinical statistics and experimental methodology. This paper proposes an analytical methodology. Specifically, this work deals with a comparison of normal walking on the ground and walking on a treadmill in regard to the external and internal impulses exerted on the joints of a human's lower extremities. First, a modeling procedure of impulses, impulse geometry, and impulse measure for the human lower extremity model will be briefly introduced and a new impulse measure for analysis of internal impulse is developed. Based on these analytical tools, we analyze the external and internal impulses through a planar 7-linked human lower extremity model. It is shown through simulation that the human walking on a treadmill exhibits greater internal impulses on the knee and ankle joints of the supporting leg when compared to that on the ground. In order to corroborate the effectiveness of the proposed methodology, a force platform was developed to measure the external impulses exerted on the ground for the cases of the normal walking and walking on the treadmill. It is shown that the experimental results correspond well to the simulation results.

• 제어로봇시스템학회논문지
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• 제13권8호
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• pp.760-768
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• 2007

This paper introduces an emotional behavior decision model based on linear system for intelligent service robots. An emotional model should make different behavior decisions according to the purpose of the robots. We propose an emotional behavior decision model which can change the character of intelligent service robots and make different behavior decisions although the situation and environment remain the same. We defined each emotional element such as reactive dynamics, internal dynamics, emotional dynamics, and behavior dynamics by state dynamic equations. The proposed system model is a linear dynamic system. If you want to add one external stimulus or behavior, you need to add just one dimensional vector to the matrix of external stimulus or behavior dynamics. The case of removing is same. The change of reactive dynamics, internal dynamics, emotional dynamics, and behavior dynamics also follows the same procedure. We implemented a cyber robot and an emotional head robot using 3D character for verifying the performance of the proposed emotional behavior decision model.

• 로봇학회논문지
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• 제14권4호
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• pp.348-356
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• 2019

The backdrivable servovalve is a desirable component for force and interaction control of hydraulic actuation systems because it provides direct force generation mechanical impedance reduction by its own inherent backdrivability. However, high parametric uncertainty and friction effects inside the hydraulic actuation system significantly degrade its advantage. To solve this problem, this letter presents a disturbance-adaptive robust internal-loop compensator (DA-RIC) to generate ideal interactive control performance from the backdrivable-servovalve-based system. The proposed control combines a robust internal-loop compensator structure (RIC) with an explicit disturbance estimator designed for asymptotic disturbance tracking, such that the controlled system provide stable and ideal dynamic behavior for impedance control, while completely compensating the disturbance effects. With the aid of a backdrivable servovalve, we show that the proposed control structure can be implemented based on a simplified nominal model, and the controller enables implementation without accurate knowledge of the target system parameters and disturbances. The performance and properties of the proposed controller are verified by simulation and experiments.

• 한국수학교육학회지시리즈E:수학교육논문집
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• 제34권3호
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• pp.325-354
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• 2020

수학 학업성취도에 영향을 미치는 요인들은 매우 다양하며, 그 요인들이 미치는 영향 또한 복합적으로 일어난다. 수학 학업성취도에 영향을 미치는 요인들은 끊임없이 변화하고 발전하기 때문에 학습자들의 성장을 예측하고 분석하는 종단연구가 필요하다. 본 연구는 서울교육종단연구의 2013년도(중학교 1학년)부터 2017년(고등학교 2학년)까지의 종단자료를 활용하여 내적요인(자아개념, 자기통제, 삶의 만족에 대한 자기평가), 외적요인(학교풍토, 자녀에 대한 보호자의 관심, 보호자의 학습조력)의 변화패턴을 알아보고 내·외적요인이 수학 학업성취도에 어떠한 영향을 미치는지 살펴보았다. 수학 학업성취도를 분석한 결과, 중학교 1학년부터 중학교 2학년까지의 수학 학업성취도는 변화가 없는 것으로 나타났으며, 중학교 2학년부터 고등학교 1학년까지는 꾸준히 증가하다가 고등학교 2학년 때는 소폭 하향하는 것으로 나타났다. 내적요인인 자아개념과 자기통제는 중학교 1학년부터 중학교 2학년까지는 소폭 떨어지다가 고등학교 1학년까지는 소폭 증가하고 고등학교 2학년에는 소폭 떨어지는 것으로 나타났으며, 삶의 만족에 대한 자기평가는 중학교 1학년부터 고등학교 2학년까지의 기간 동안 소폭 떨어지는 것으로 나타났다. 외적요인 중 학교풍토는 중학교 1학년부터 중학교 2학년까지는 소폭 떨어지는 것으로 나타났으며, 고등학교 1학년까지는 증가하다가 고등학교 2학년에는 그 값이 유지되는 것으로 나타났다. 자녀에 대한 보호자의 관심은 중학교 1학년 때의 값이 고등학교 2학년까지 유지되는 것으로 나타났으며, 보호자의 학습조력은 중학교 1학년부터 지속적으로 감소하는 것으로 나타났다. 수학 학업성취도에 대한 영향을 알아보기 위해 임의 기울기 모델(Random Slope Model)을 시행한 결과 내적요인인 자아개념 및 자기통제, 그리고 외적요인인 학교풍토가 수학 학업성취도의 변화에 영향을 미치는 것으로 나타났다.

• 대한기계학회논문집A
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• 제24권7호
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• pp.1689-1696
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• 2000

This paper proposes a new adaptive control scheme for flexible-link robots. A model-based nonlinear control scheme is designed based on a V-shape Lyapunov function, and then the nonlinear control i s extended to a model-based adaptive control to cope with parametric uncertainties in the dynamic model. The proposed control guarantees the global exponential or global asymptotic stability of the overall control system with all internal signals bounded. The effectiveness of the proposed control is shown by computer simulation.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1995년도 Proceedings of the Korea Automation Control Conference, 10th (KACC); Seoul, Korea; 23-25 Oct. 1995
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• pp.436-439
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• 1995

In this paper we present a method to construct fuzzy model with multi-dimension input membership function, which can construct fuzzy inference system on one node of the network directly. This method comes from a common framework called Universal Learning Network (ULN). The fuzzy model under the framework of ULN is called Universal Learning Network-based Fuzzy Inference System (ULNFIS), which possesses certain advantages over other networks such as neural network. We also introduce how to imitate a real system with ULN and a control scheme using ULNFIS.

• 한국정밀공학회지
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• 제22권6호
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• pp.76-82
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• 2005

In this paper, the pole placement controller based on the Robust Internal-loop Compensator (RIC) structure, which has inherent structural equivalence to disturbance observer, is proposed to control a linear positioning system. This controller has the advantage to easily select controller gains by using pole placement without loss of that of original RIC structure. The principal is to construct the pole placement controller for a nominal internal model instead of unknown real plant. Using linear motion experiment showed the effectiveness of the proposed controller.