步速變化에 따른 미끄러짐의 생체역학적 연구

서국웅,윤양진,서국은,이중숙,김용재,이언석,이훈식 釜山大學校 附設 體育科學硏究所 1992 體育科學硏究所 論文集 Vol.8 No.-

The purpose of this study was to analyze walking steps to prevent unnecessary energy consuming and prevention of injury from sliding when someone was walking. The questionnaire, high speed video system, E.M.G. system, and force platform system were used to analyze sliding mechanism in biomechanical perspective. Several results were found as following: 1. According to questionnaire regarding sliding, 93.3% of participants have sliding experiences. People have sliding experiences by greasy floor(48.4%) and obstacle (22.5%). Sliding types were found from different kinds of shoes such as sneakers (48.8%) and boots (34.2%). The results were presented as following 44.6% of participants were fall down front direction and 40.3% of people fell down rear side. 2. According to the high speed video system analyzer, step sliding increased with increasing step speed from distance and acceleration speed experiment with 80 steps/min, 100 steps/min, 120 steps/min. Also, the most sliding were occurred with sneakers, boots, and bare feet as order. 3. According to E.M.G. test results, the vastus lateralis M., the vastus medialis m., and the tibialis anterior m. of electric action potential presented strongly when participants fell front, rear, and right side. The vastus lateralis m. and the tibialis anterior m. of electric action potential presented strongly when someone fell left side, but the vastus medialis m. and the gastrocnemius m. of electirc action potential presented as weaker. 4. According to the force platform test results, the most big change of floor antipower of x-axis presented when someone fell the left side. The most of big change of floor antipower of y-axis presented when someone fell down rear side. The most of big change of floor antipower of z-axis presented similarly when someone fell the front, rear, left, and right side.

Biochemical Characteristics and Antimicrobials Susceptibility of Salmonella gallinarum Isolated in Korea

Ki-seuk Kim,Young-ju Lee,Yong-kuk Kwon,Ryun-bin Tak 대한수의학회 2003 Journal of Veterinary Science Vol.4 No.2

Characteristics and Antimicrobials Susceptibility of Salmonella gallinarum Isolated in KoreaYoung-ju Lee, Ki-seuk Kim1,*, Yong-kuk Kwon and Ryun-bin Tak1Avian Disease Division, National Veterinary Research and Quarantine Service, Anyang 430-824, Korea1College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, KoreaReceived February 13, 2003 / Accepted April 30, 2003J. Vet. Sci. (2003), 4(2), 161-166JOURNAL OFVeterinaryScience*Corresponding author: Ki-seuk Kim College of Veterinary Medicine, Kyungpook National University, Daegu 702-701, Korea Tel: 82-53-950-5962, Fax: 82-53-950-5955 E-mail: kimkiseuk@knu.ac.kr

오이 특징점 인식을 위한 영상처리 알고리즘 개발

이원희,이대원,이용국 성균관대학교 생명과학자원연구소 1997 生命資源科學硏究 Vol.4 No.1

An image processing algorithm was designed and constructed to recognize and measure the geometric shapes of a cucumber for a short real time using a computer vision system. The main components of the vision system included fluorescent lighting equipment as a light source, CCD (charge coupled device) camera, VGA (video graphics array), PC computer to grade a stationary cucumber. The algorithm was developed to recognize geometric features of a cucumber and also to reduce the processing time of them. Total image processing time was about 0.5 second, where only grabbing time was required more than 0.3 second. Geometric features include straight length, chord length, bending length, area, bending angle, maximum thickness and minimum thickness. Qualitative performance of the algorithm proved to be a reliable algorithm for geometric features of a cucumber.

Study on Microstructure and Mechanical Properties of the Al–25Cr–5Si (at%) Alloy Powder Using Gas-Atomization and SPS Process

Yong‑Ho Kim,Hyo‑Sang Yoo,Jeong‑Han Lee,Ik‑Hyun Oh,Hyun‑Kuk Park,Hyeon‑Taek Son 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7

In order to investigate the microstructure and mechanical properties on Al–25Cr–5Si (at%) alloy, a mixed powder with pureelements and an alloy powder using a gas atomization process were used. Fine and high purity Al–25Cr–5Si (at%) alloypowder was successfully prepared by gas atomization and densified using a spark plasma sintering (SPS) process. The overallpowder size distribution of the mixed Al, Cr, and Si elemental powders was in the range of 10–15 μm. The atomized Al–Cr–Sialloy powder was fine and spherical in morphology and difficult to be formed by intermetallic formation. Densification wasclearly confirmed at 1000 °C, with almost isolated pores formed, by clear removal of pores between particles, deformationof particles, an increase in the number of contacts, and a change in size between particles. As a result of XRD analysis ofthe sintered compacts, single phase was observed using the mixed powder, but the compact using gas atomization remainedthe alloy phase even at the process temperature. The Vickers hardness of the compacts by mixed powder was observed at59.70 Hv and the compact using gas atomized powders on the temperature 1000 °C of the Vickers hardness increased to702.6 Hv. The compressive yield strength of the compact with mixed powder was 195.24 MPa and the compressive strengthof the compact with gas atomized powder increased to 802.07 MPa. It is considered not to be decomposed by the AlCrSi,Al13Cr4Si4and Al8Cr5phases sintering process, resulting from the improvement of mechanical properties.

초등학생의 태권도 수련활동참가가 예절의식 및 자기통제능력에 미치는 영향

이용국 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.20 No.1

Teakwondo Practice etiquette and self-control. In order to achieve this purpose, 450 subjects were selected among participants of Taekwondo activity programs in the Seoul and Kyunggi area by using the stratified cluster random sampling method. Out of the 360 questionnaires responded to, only 338 were used for data analyses because 22 were responded to incompletely or incorrectly. The instrument for data collection was a questionnaire in which etiquette and self-control consisted of items identified by Jang(1993) and Lee(2002), respectively. The statistical methods utilized in the study for analyzing the collected data were reliability analysis, descriptive statistics, one-way ANOVA, standard multiple regression analysis and path analysis, and the following results were obtained: First, First, both etiquette and self-control differ statistically and significantly according to both socio- demographic variables and Taekwondo practice. Second, both etiquette and self-control differ statistically and significantly according to both socio- demographic variables and Taekwondo practice. Third, etiquette statistically and significantly influences self-control.

로봇 포도수확기를 위한 엔드이펙터 개발

이대원,김현태,이용국 성균관대학교 생명공학연구소 2001 生命工學硏究 Vol.7 No.1

Most of fruits need laboring greatly to harvest fruit in the period of harvest season. Grape also needs requiring a lot of labor to harvest in time, since harvesting of grape is cut and graped by hand. At abroad, especially, a harvester of grape, which is not eat freshly raw grape fruit but is processed to be made wine, was developed in France. However, a harvester of grape which can eat freshly raw grape fruit haven't not been developed. Therefore, this study was designed and constructed to develope an end effector of the robotic harvesting system. In order to find average and standard deviation of size and shape of a bunch grape, the grape farm was visited and investigated to find out the important factors for end effector to be designed and built. The efficient end-effecter should reach very well a bunch of grape without touching obstacles, such as leaf and stem in the grape vine. Also, it was made as simple, small and light as possible. Therefore, It was made of duralumin, which was lighter material than iron, to reach easily fresh grape fruit and reduce a torque. After finding the optimum initial speed, slew speed, ramp speed, the end effector proved to be a smooth operating end effector. For verifying efficiency of the end-effecter, the control board was designed and manufactured, and also developed the software to control the motors of the end effector.

태양 추적 장치를 갖는 집광 시스템의 집열 특성

이용훈,최석천,지명국,이상철,정효민,정한식 경상대학교 해양산업연구소 2002 해양산업연구소보 Vol.15 No.-

The purpose of this research is to obtain the heat transfer characteristics of the absorber type solar collector. This new system moving by time and degree. The second system had the solar tracking system. The x-y axis were designed at intervals of 0.33˚/min and 0.16˚/min respectively. In this system the absorber specification was 1OOLX80Φ1.4t. This experiment was conducted from July to August. 2002. The temperature of solar collector was reached about mean temperature 250℃.

3중 적층형 압전 트랜스듀서의 주파수 특성

李鎔國,李海龍,韓得永 건국대학교 1995 學術誌 Vol.39 No.2

Frequency characteristics of a three-layered piezoelectric transducer are analyzed with three piezoelectric ceramic disk vibrators and two sheets of thin isolator. The electric input voltage near its fundamental resonant frequency is applied to the center vibrator and the output voltages across the left and the right vibrators are connected in parallel or in series to the resister load. Moreover, equivalent circuits are derived from the Mason's model for parallel connection and series connection. Also, equations of voltage ratio, resonant frequency, phase angle between the Input and output voltages, and bandwidth have been derived. Computed values from those equations are compared with measured values. Both are shown to agree well each other. Key words : Three-layered piezoelectric transducer(3중 적층형 압전 트랜스듀서), Equivalent circuit(등가회로), Parallel connection(병렬연결), Series connection(직렬연결), Resonant frequency(공진주파수), Bandwidth(대역폭)

21C 부산체육의 활성화를 위한 시설 및 프로그램 연구

이상봉,김용재,서국웅,양점홍 釜山大學校 附設 體育科學硏究所 1996 體育科學硏究所 論文集 Vol.12 No.-

This research investigated Institution and Program for the Development of the Pusan Sports in 21C by examining literatures. Conclusiona from the results as follows. 1. We should provide a long period propulsion project in three stage with planning, diffusion and development stage for the bring development and diffusion of Program. 2. We should establish a specialty research institution, the exclusive responsibility of program's development and research. 3. We should provide various participation programs not that for an elite athlete but that for all nation. 4. Enlarge the same taste club and we must support with various administration and financial. 5. Cultivate a specialty leader and we must take interested in the study and training with continual.

코크스 오븐에서 에너지 효율 향상을 위한 통합연소진단시스템 개발

이지수,이용국,이성우,심재우 한국공업화학회 2004 응용화학 Vol.8 No.1

In making coke through carbonization process, it is possible to produce the required high quality coke in blast furnace and reduce the cost of energy as well as increase the life of coke oven if we maintain the desired coke oven temperature by means of optimal combustion management (CM). In this study, hybrid combustion diagnostic expert system (HCDES) was developed through analyzing the trend and temperature distribution of flues in the oven and combining the domain expert's knowledge. The model also considered and incorporated the characteristics and the structure of the oven. In developing the diagnostic system, a general and accessible expert language, CLIPS (C Language Integrated Production System) was used.