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CAD SYSTEM을 활용한 디자인 다각화 방향과 시뮬레이션 연구 - 사무용 회전의자를 사례로 한 개발 제품의 모형화 접근 -
서동진,Seo Dong-Jin 한국가구학회 2003 한국가구학회지 Vol.14 No.1
It has shown that the investment on the new products have a direct influence on the price of manufactured goods. This brings about a point, which has been a common problem for many Korean enterprises. That is Korean products can only its international competitiveness from the price, not quality. Our industry has shown its movement from producing cheap, low quality products to creating somewhat more advanced and higher qualify products. However the industry cannot avoid the financial burden from the investment. Just like the title of this article, for existing the 3D-MODELING, the 3D-CAD is existed first has immediate effect on the many developing processes, such as planning a product, designing, and producing. The development of the furniture design in the future will be done in the same way as this article presents. This will have a great effect on the overall productivity. (Time, cost, efficiency and etc). The simulation experiment on this article is based on the idea of development of industry, forms the immediate constituent for the prediction related to the production development, marketing and the trend. Which means, this will play an important part where companies achieve satisfaction from the marketing part and the economy.
두 개의 거리 센서를 이용한 차륜형 로봇의 이동물체 추종제어
서동진,노성우,고낙용,Seo, Dong-Jin,Noh, Sung-Woo,Ko, Nak-Yong 한국전자통신학회 2011 한국전자통신학회 논문지 Vol.6 No.5
본 논문에서는 거리센서기반의 차륜형 로봇의 물체추적과 추종에 대한 로봇의 구동제어방법을 제안한다. 물체 추종을 위해 1개의 초음파 송신부와 2개의 초음파 수신부를 사용하여 추종하고자 하는 물체로부터 2개의 거리데이터를 생성한다. 생성된 거리데이터를 기반으로 로봇의 물체까지의 직진오차와, 회전오차를 산출한 뒤, 물체 추종을 위해 PID제어기 기반의 조작량을 계산하여 로봇의 동작제어에 사용한다. 제안된 방법의 특징을 확인하기 위해 3가지 경우에서 실험을 수행하였으며 PID게인이 로봇의 움직임에 미치는 영향과 직진오차게인과 회전오차게인이 로봇의 움직임에 미치는 영향을 각각 확인해 보았다. 제안된 방법은 항상 추종물체를 로봇에 대하여 일정위치에 존재하도록 하는 기법으로 물체추종 어플리케이션 이외에도, 여러 대의 로봇이 특정한 대형을 이루어 움직이게 하는 군집형 제어 문제에 적용될 수 있다. This paper proposes a control method for a differential robot to track and follow a moving object based on ultrasonic sensor. To track a target object, the method uses a transmitter and two receivers to get distances from the object. The method derives translational and rotational error by the distances and then it uses the errors to calculate control values based on PID control method. The control values are used to control the robot to follow moving object. The authors do some experimentations to analyze some characteristics such as influence of PID gain, influence of translational and rotational gain. This method not only can be applied for following moving object problem but also can be done group unit control problems.
수종(數種)의 한약재(韓藥材) 전탕액(煎湯液)이 동물 간조직내 항섬유효능검색에 관한 실험적 연구
서동진,이춘우,김홍기,이기남,Seo Dong-Jin,Lee Chun-Woo,Kim Hong-Gi,Lee Ki-Nam 대한예방한의학회 2001 대한예방한의학회지 Vol.5 No.1
Antifibrotic drugs could be delayed or inhibited massive collagen deposition in liver tissue or inhibited collagen synthesis. we investigated antifibrotic effects by several herbs(Schisnadra chinensis, Ganoderma japonicum, Sedum sarmentosum, Alisma canaliculatum, Plantago asiatica) extract with observations of collagen accumulation in liver tissue and collagen synthesis in sera. Rats were used for experimental animal that were devided 3 groups(sham control, BDL/S, BDL/S-ER). Rats were operated for inducing liver fibrosis(cirrhosis) by bile duct obstruction. Several herbs were prepared by water extraction and were applicated p. o. $3ml/day$ during 4 weeks. After observation period, rats were sacrificed and liver tissue and sera were collected. In result, the mortality of rats was 35% in BDL/S group and 20% in BDL/S-ER The color of bile juice in BDL/S-ER was bright yellow and murky yellow in BDL/S group. The significantly lower weight of liver($16.21g{\pm}5.3,\;20.58{\pm}2.4$) and spleen($1.96g{\pm}0.96,\;3.93{\pm}0.21$) were shown in BDL/S-ER than that of BDL/S(p<0.05) group. The value of collagen in liver tissue(25.7%) in BDL/S-ER was observed significantly lower than that of BDL/S group (Tab. 2). AST. ALT, ALP, t-bilirubin, BUN levels were low in BDL/S-ER as compared with those of BDL/S group, but the significance was not proven. The trichrome stained liver tissue in BDL/S-ER group was observed mild bile duct proliferation and fibrosis compared with BDL/S group. In conclusion, natural products inhibited new collagen synthesis and delayed massive collagen deposition in liver tissue, so that they have noticeable antifibrotic effects in experimental liver fibrosis(cirrhosis).