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요통에서의 pressure biofeedback unit(stabilizer)를 사용한 안정화 운동
김국주,공관우,권순오,장용근,황희준,박준기,Kim, Gook-Joo,Kong, Kwan-Woo,Kwon, Sun-Oh,Jang, Yong-Geun,Hwang, Hee-Jun,Park, Jun-Ki 대한물리치료과학회 2012 대한물리치료과학회지 Vol.19 No.2
Purpose : This study aimed to acquire a basic knowledge about lumbar stability and inquire into exercise approach of pressure biofeedback unit for lumbar stability. Methods : This study was composed with reviewed theory of lumbar stability and several books and articles for exercise using pressure biofeedback unit. Results : The stability of lumbar should work symmetrical with passive, active, control subsystem in neutral zone, and local muscles should be using for stability. Especially, selective using of transverse abdominis work for lumbar stability importantly. The control of using pressure biofeedback unit may important not only examination but treatment. Conclusion : The stability of lumbar need co-contraction of specific local muscle and training for timing as well as using pressure biofeedback unit for accurate control may use for examination and therapedic approach.
지하시설내 드론전투체계 운용을 위한 요구능력 도출 연구
김국주(Kim, Kukjoo),이영주(Lee, Youngju),이선호(Lee, Sunho),박영준(Park, Youngjun) 한국방재학회 2020 한국방재학회논문집 Vol.20 No.2
본 연구의 목적은 지하시설내 대량살상무기제거 작전에 드론전투체계를 운용하기 위한 요구성능을 도출하는데 있다. 연구방법은 델파이기법을 사용하였으며, 30명의 드론전투체계 기술개발 및 WMD 제거작전과 관련 있는 전문가 그룹을 구성하였다. 1차 설문은 드론전투체계의 요구성능에 관한 개방형 질문을 통해 고려요소를 도출하였고, 2-4차 설문은 고려요소에 대한 전문가의 합의여부를 통계적으로 분석하였다. 채택된 전문가의 의견에 대해 요인분석을 실시한 결과, 총 8개의 요인으로 요구성능이 도출되었음을 확인하였다. This research aimed to derive the required operational capability considerations of the drone combat system to carry out CWMD operations in underground facilities. The Delphi technique was used for this study and the survey was conducted among 30 experts in the fields of drone combat systems and CWMD operations, and in the military and civilian sectors. The first questionnaire investigated the required operational capabilities by using open-ended questions, and the second to fourth questionnaires statistically analyzed the agreement of the experts on each required capability. As a result of the factor analysis, a total of eight factors were derived.
건물의 EMP 감쇠특성을 고려한 EMP 방호등급 결정 방안
김국주(Kim, Kukjoo),박영준(Park, Young-Jun) 대한건축학회 2021 대한건축학회 학술발표대회 논문집 Vol.41 No.2
The primary purpose of this study was to classify electromagnetic pulse (EMP) protection levels and determine various protection measures. The numerical analysis was conducted to determine the attenuation characteristics of building materials and geometry designs. The natural attenuation effect of soil, concrete and reinforcement of building materials. was confirmed for structures installed underground. For instance, the attenuation effect of wet soil for underground facility was up to 30dB. Therefore, EMP shelters can be constructed by applying the differential protection level scheme applying more effective EMP protection measures such as light-weight film, fabric, paint and wall papers.
Ti-6Al-4V 합금의 형상 링 압연공정 설계 및 제조기술
김국주(K. J. Kim),김남용(N. Y. Kim),이진모(J. M. Lee),염종택(J. T. Yeom) 한국소성가공학회 2009 한국소성가공학회 학술대회 논문집 Vol.2009 No.10
Design and Manufacturing processes of Ti-6Al-4V profiled ring-products were investigated with three-dimensional FEM simulation and experimental analyses. FEM simulation for the ring-rolling process was used to calculate the state variables such as strain, strain rate and temperature. In the simulation results of strain and temperature distributions for a plane ring rolling process, the strain level at the surface area is higher than that at the mid-plane, but the temperature level at the surface area is lower than that at mid-plane due to heat transfer between the workpiece and the work roll. These distributions showed a great influence on the evolution of microstructure in different positions. In order to induce the uniform deformation of the profile ring and reduce the applied load, the final blank was prepared by two-step processes. The mechanical properties of Ti-6Al-4V alloy ring products made in this work were investigated with tensile and impact tests and analyzed with the evolution of microstructures during the ring rolling process.