http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A Paddling Based Locomotive Mechanism for Capsule Endoscopes
Sukho Park,Hyunjun Park,Sungjin Park,Byungkyu Kim 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.7
Diagnosis and treatment using the conventional flexible endoscope in gastro-intestinal tract are very common since advanced and instrumented endoscopes allow diagnosis and treatment by introducing the human body through natural orifices. However, the operation of endoscope is very labor intensive work and gives patients some pains. As an alternative, therefore, the capsule endoscope is developed for the diagnosis of digestive organs. Although the capsule endoscope has conveniences for diagnosis, it is passively moved by the peristaltic waves of gastro-intestinal tract and thus has some limitations for doctor to get the image of the organ and to diagnose more thoroughly. As a solution of these problems, various locomotive mechanisms for capsule endoscopes are introduced. In our proposed mechanism, the capsule-type microrobot has synchronized multiple legs that are actuated by a linear actuator and two mobile cylinders inside of the capsule. For the feasibility test of the proposed microrobot, a series of in-vitro experiments using small intestine without incision were carried out. From the experimental results, our proposed microrobot can advance along the 3D curved and sloped path with the velocity of about 3.29~6.26 ㎜/sec and 35.1~66.7% of theoretical velocity. Finally, the proposed locomotive mechanism can be not only applicable to micro capsule endoscopes but also effective to advance inside of gastro-intestinal tract.
Investigation of Generative Contactile Force of Frog Muscle under Electrical Stimulation
Sukho Park,Changyeol Jee,Jiwoon Kwon,Sungjin Park,Byungkyu Kim,Jongoh Park 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.11
Recently, the microrobots powered by biological muscle actuators were proposed. Among the biological muscle actuators, frog muscle is well known as a good muscle actuator and has a large displacement, actuation forces and piezoelectric properties. Therefore, for the application of the biomimetic microrobot, this paper reports the electromechanical properties of frog muscle. First of all, the experimental setup has been established for measuring generative force of the frog muscle. Through the various electrical stimulating inputs to the frog muscle, we measured the contractile force of the frog muscle. From the measuring results, we found that the actuating contractile force responses of the frog muscle are determined by the amplitude, frequency, duty ratio, and wave form of the stimulation signal. This study will be beneficial for the development of the microrobot actuated by frog muscle.
Contractile Force Measurements of Cardiac Myocytes Using a Micro-manipulation System
Sukho Park,Seokkyu Ryu,Seokchang Ryu,Deokho Kim,Byungkyu Kim 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.5
In order to develop a cell based robot, we present a micro-mechanical force measurement system for the biological muscle actuators, which utilize glucose as a power source. The proposed measurement system is composed of a micro-manipulator, a force transducer with a glass probe, a signal processor, an inverted microscope and video recording system. Using this measurement system, the contractile force and frequency of the cardiac myocytes were measured in real time and the magnitudes of the contractile force of each cardiac myocyte under different conditions were compared. From the quantitative experimental results, we could estimate that the force of cardiac myocytes is about 20~40 μN, and show that there are differences between the control cells and the micro-patterned cells.
A 512 Cycles/MB, Enhanced Fast Motion Estimation Strategy for 1080p High Profile H.264/AVC
Sukho Lee,Seongmo Park,Jongwon Park 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
We present an enhanced fast motion estimation algorithm for Full HD (1080p) High Profile H.264/AVC. Most of processing cycles are occupied with motion estimation and use external memory access to fetch samples, which degrades the performance of the encoder. A novel approach to fast motion estimation with that uses shared multi-bank memory can solve these problems. The proposed enhanced hierarchical search algorithm is suitable for fast motion vector (MV) searches for high-quality resolution images. The proposed algorithm not only achieves an 87.5% reduction of computational complexity compared with the full search algorithm in the JM reference software, but also sustains the video quality without any conspicuous PSNR loss.
Motility enhancement of bacteria actuated microstructures using selective bacteria adhesion
Park, Sung Jun,Bae, Hyeoni,Kim, Joonhwuy,Lim, Byungjik,Park, Jongoh,Park, Sukho Royal Society of Chemistry 2010 Lab on a chip Vol.10 No.13
<P>Microrobots developed by the technological advances are useful for application in various fields. Nevertheless, they have limitations with respect to their actuator and motility. Our experiments aim to determine whether a bioactuator using the flagellated bacteria <I>Serratia marcescens</I> would enhance the motility of microrobots. In this study, we investigate that the flagellated bacteria <I>Serratia marcescens</I> could be utilized as actuators for SU-8 microstructures by bovine serum albumin-selective patterning. Firstly, we analyze the adherence of the bacteria to the SU-8 micro cube by selective patterning using 5% BSA. The results show that number of attached-bacteria in the uncoated side of the selectively- coated micro cube with BSA increased by 200% compared with that in all sides of the non treated micro cube. Secondly, the selectively BSA coated micro cube had 210% higher motility than the uncoated micro cube. The results revealed that the bacteria patterned to a specific site using 5% BSA significantly increase the motility of the bacteria actuated microstructure.</P> <P>Graphic Abstract</P><P>The bacteria patterned to a specific site using 5% BSA significantly increase the motility of the bacteria actuated microstructure. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c000463d'> </P>
Mechanotransduction of cardiomyocytes interacting with a thin membrane transducer
Park, Jungyul,Kim, Il Chaek,Cha, Jaemin,Park, Sukho,Lee, Junghoon,Kim, Byungkyu IOP 2007 JOURNAL OF MICROMECHANICS AND MICROENGINEERING - Vol.17 No.6
<P>A novel platform is developed to study the mechanotransduction of cardiomyocytes. After the cardiomyocytes are seeded on 10 ?m thin, dome-shaped membranes with different sizes, their morphology and beating frequency are monitored. While the cells seeded on a larger membrane (800 ?m ? 800 ?m) grow normally, cells on a smaller membrane (200 ?m ? 200 ?m) grow in isolated groups, showing a lumped morphology. The beating frequency of the cells on the smaller membrane was faster than on the larger membrane. This intriguing phenomenon may be explained by the mechanical stress determined by the area of the membrane that affects the opening of ion channels.</P>
이석호(Sukho Lee),황수찬(Soochan Hwang),나연묵(Yunmook Nah),이상돈(Sangdon Lee),권택근(Taeckguen Kwon),차재혁(Jaehyuk Cha),박지숙(Jisook Park),박한묵(Hanmook Park),김황남(Hwangnam Kim),이규철(Kyuchul Lee) 한국정보과학회 1994 정보과학회논문지 Vol.21 No.7
최근 들어 멀티미디어 처리 기술의 급속한 발전과 더불어 멀티미디어 데이타의 저장, 관리에 핵심적인 역할을 하는 멀티미디어 DBMS의 개발에 관심이 집중되고 있다. 본 논문은 프로토타입 멀티미디어 DBMS인 ALPHA 시스템의 설계 및 구현에 대해 기술한다. 이 ALPHA 시스템은 멀티미디어 데이타의 특성을 고려하여 설계되었고, 시각적인 사용자 인터페이스, 객체 지향 기법을 확장한 객체 관리 기능, 멀티미디어 저장객체의 관리 기능 등을 제공한다. Recently, the rapid development of multimedia processing technology has caused the increasing demand for multimedia database management systems that can store and manage multimedia data. This paper describes the design and implementation of the ALPHA system, a prototype multimedia DBMS which is designed in consideration of the characteristics of multimedia data The system supports visual user interface, object manager based on the extended ob ject-oriented paradigm, and multimedia storage object manager.