재사용 시스템비계와 시스템동바리 수직재의 허용강도 분석

박진석,고상섬,원정훈,Park, Jin-Suk,Ko, Sang Seom,Won, Jeong-Hun 한국안전학회 2021 한국안전학회지 Vol.36 No.4

The allowable strength based on experiments and the design allowable strength calculated using the design criteria were compared, which suggested a ratio between the allowable strengths for the reused vertical members of the system scaffolding and system support. By investigating a total of 421 certification reports for reused vertical members, the experimental allowable strengths were collected. Using design criteria such as the road bridge design and KDS 14 30 10, the design allowable strengths were calculated for various slenderness ratios. For the system scaffolding, the average ratio between the experimental and design allowable strengths was calculated to be 0.880 by assuming a normal distribution for all specimens. However, by analyzing the strength ratio according to the slenderness ratio, the lowest average strength ratio was found to be at least 0.844. Therefore, it is reasonable to assume that the allowable strength of the reused vertical members was 80-84% of the design allowable strength. In addition, assuming the allowable strength to be 85% of the design allowable strength is a possible method for reused vertical members of system supports.

바른체형운동-Ⅱ가 경도 지적장애 학생의 족저압력 및 평형성에 미치는 영향

박진석(Park, Jin-Suk),곽이섭(Kwak, Yi-Sub),양정옥(Yang, Jeong-Ok) 한국코칭능력개발원 2019 코칭능력개발지 Vol.21 No.1

Dual source CT 검사에서 산란선에 의한 공간선량 및 외부 누설선량 평가; Single Source와 비교

박진석(Jin Suk Park),이호석(Ho Seok Lee),이민영(Min Yung Lee),남윤철(Yoon Chui Nam),강병삼(Byung Sam Kang),박훈희(Hoon Hee Park) 대한CT영상기술학회 2015 대한CT영상기술학회지 Vol.17 No.2

Purpose : To know dose distribution as measuring space dose and outside leakage dose with comparing Dual energy, dual source and single energy, and to figure out suitable defense facility at present for dual source equipment using many hospitals because the standard defense facility inside CT exam room at present designed to single source standard facility. Materials & Methods : CT equipment were used that Somatom Definition Flash(Siemens Healthcare, Forchheim, Germany) and Discovery CT 750(General Electric Medical System, Milwaukee, Wisconsin USA) 64 MDCT. For measuring space dose by scatter ray, Ion Chamber (RDACAL MOD 10×5-180, USA) of Radical Company was used, and for leakage dose measuring, Ion Chamber (RADCAL MOD 10×5-1800, USA) of the same company was used. Also, Alderson Rando phantom (CNMC Company, USA), which is a model of a human body, was used. As the method of experiment, it was compared that single source dual energy, dual source dual energy and single energy, single source single energy, and space dose. As tube voltage, it was measured that 1m, 1.5m, 2m different gap from Isocenter standard by distance with same tube current and exposure time doing dual energy 80 kv-140kv and single energy 120 kv. Also, it was measured with same fixed CTDIvol as making the same expected dose index of two exam methods. As adapting exam protocol using present clinic, for comparing dual energy and single energy and Chest embolism protocol, dual source and single source, it measured space dose with Thoracoabdominal angio protocol. Lastly, using the maximum possible exposure condition for measuring dual energy leakage dose, it measured total 3 spots that the front console glass, examiner door and patient door 1m height from ground, and it measured 20 times repeat for reducing error. As statistic technique, student t-test was used to compare the space dose of single energy, dual energy and single source, dual source. Results : 1. As comparing the space dose of dual energy and single energy of GE company, it showed dual energy was higher average 2% applied the same CTDIvol for equal of two exam methods expected dose index, and no significant difference (P=0.858). 2. As comparing the space dose of dual energy and single energy of Siemens company, it showed dual energy was higher average 7% applied the same CTDIvol for equal of two exam methods expected dose index, and no significant difference (P=0.159). 3. As comparing the space dose of dual energy and single energy applied present clinical exam protocol of GE company, it showed dual energy was higher average 6%, but no significant difference (P=0.319). 4. As comparing the space dose of dual energy and single energy applied present clinical exam protocol of Siemens company, it showed single energy was higher average 64%, therefore shows significant difference (p<0.001). 5. The leakage doses were measured under 0.01 mR on all three spots for all two companies. Conclusion : Examiners who use dual source CT should apply to clinical environment with equipments merits and demerits, and also need to consider the effort to reduce radiation dose. 목적 : Dual energy와 dual source을 single energy와 비교하여 공간선량 및 누설선량을 측정하여 선량 분포를 알아보고, 현재 CT검사실 구역 내 방어시설의 기준은 single source 장비를 기준으로 설계되어 있기 때문에, 많은 병원에서 설치 사용중인 dual source 장비의 경우에도 현재 방어시설의 기준에 적합한 지를 알아보고자 하였다. 대상 및 방법 : CT 장비는 somatom Definition Flash(Siemens Healthcare, Forchheim, Germany)와 Discovery CT 750(General Electric Medical System, Milwaukee, Wisconisin USA) 64 MDCT를 사용하였다. 산란선에 의한 공간선량 및 누설선량 측정에는 Radical 사의 Ion Chamber가 사용되었다. 실험 방법으로는 에너지 비교를 위해 단일 에너지와 이중 에너지를 비교하였고, 선원 비교를 위해 단일 선원과 이중 선원의 공간선량을 비교하였다. 첫 번째 검사조건으로 관전압과 관전류 및 조사시간을 맞추어 스캔 하였고, 두 번째로 두 검사 기법간 CT의 예측선량지수가 같도록 CTDIvol을 동일하게 하여 측정하였다. 또한, 현재 임상에서 사용되고 있는 검사 프로토콜을 적용하여 이중에너지와 단일에너지 그리고 이중 선원과 단일 선원의 공간선량을 측정하였다. 마지막으로 dual energy의 누설선량 측정을 위해 장비에서 가능한 최대조건을 적용하여 지상에서 1m 높이에서 Console 유리 앞, 검사자 출입문 앞 환자 출입문 앞 총 3곳에서 누설선량을 측정하였으며, 오차를 줄이기 위해 각 장소에서 20회 반복측정 하였다. 통계적 기법으로는 single energy와 dual energy 및 single source과 dual source의 공간선량을 비교하기 위하여 student t-test를 사용하였다 결과 : 1. GE 장비사 dual energy와 single energy의 공간선량 비교 시 두 검사기법간 예측선량지수가 같도록 CTDIvol 값을 같게 적용시 dual energy가 평균 2% 높게 나타났으며, 유의한 차이를 보이지 않았다(P=0.858) 2. Siemens 장비사 dual energy와 single energy의 공간선량 비교 시 두 검사기법간 예측선량지수가 같도록 CTDIvol 값을 같게 적용시 dual energy가 평균 7% 높게 나타났으며, 유의한 차이를 보이지 않았다(P=0.159) 3. GE 장비의 임상에서 사용중인 검사 프로토콜을 적용하여 dual energy와 single energy의 공간선량 비교 시 평균 6% dual energy의 공간선량이 높게 나타났지만, 통계적으로 유의한 차이를 보이지 않았다(P=0.319) 4. Siemens 장비의 임상에서 사용증인 검사 프로토콜을 적용하여 dual energy와 single energy의 공간선량 비교 시 평균 64% 단일에너지의 공간선량이 높게 나타나 유의한 차이를 보였다(p<0.001). 5. 두 장비사 모두 누설선량은 3곳 모두에서 0.01 mR 이하의 누설선량이 측정되었다 결론 : Dual source CT 장비를 사용하는 검사자들은 장비의 장단점을 잘 활용하여 임상에 적용 할 수 있어야 하며, dual source CT의 방사선량을 줄이려는 노력이 필요하다 사료된다.

통신산업 규제기관의 독립성 확보방안에 관한 연구

박진석(Jin-Suk Park),황인정(In-Jeong Hwang) 한국통신학회 1999 한국통신학회 학술대회논문집 Vol.1999 No.7

가상환경에서 힘반영 원격조작에 관한 연구

박진석(JIn-Suk Park),김대현(Dae-Hyun Kim),오금곤(Geum-Kon Oh),김영동(Young-Dong Kim) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-

In Teleoperation system, the force information is important in dealing with fragile or explosive object. But appropriate size or precision of force sensors are always unavailable in some applications Futhermore, the system becomes unstable due to the time delay in transferring<br/> the force information This paper presents a framework of the teleoperation system based on virtual environments This system consists of three process; the graphic simulation, slave arem control, and haptic process. In this approach, the problems caused by the force sensor and the instability in the presence of time delay can be overcome becuase the reaction force calculated from the virtual internal models when the slave arm is in contact with an object. With this system, a stable contact task was accomplished with the reaction force information. The experimental results to verified the effectiveness are described in this paper

Standardization Self-Certification of Small-Quantity Production Automobile

Jin-suk Park(박진석),Pyeong-an Kim(김평안),Heung-sik Lee(이흥식),Sung-yong Ha(하성용) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6

촉각 제어 시스템을 위한 제어용 인터럽트 타이머의 구현

박진석(Jin-Suk Park),김대현(Dae-Hyun Kim),김영동(Young-Dong Kim) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11

In this paper, we propose a controllable interrupt timer for haptic control system haptic control system, which was divided into two processes as virtual environment(VE) manager and haptic controller The VE manager displays the 3D graphic scene at low update rates 25Hz and haptic controller controls the haptic display at high update rates 1000Hz. To archive the accurate update rate, we have imple-mented a timer so called "AccTimer" based on Windows@ multimedia functions. The proposed "AccTimer" for haptic control system has been Imple- mented in a personal computer with a 6-DOF haptic interface. Experimental results show that our system is robust with respect to tolerances in the control rates, and also, through the accurate control rate the operator can always feel a stable force.

자연과학분야 : 남자 청소년의 수동적 신체정렬움직임이 부위별 신체부정렬 및 족저압력에 미치는 영향

박진석 ( Jin Suk Park ),송상협 ( Sang Hyup Song ),이호성 ( Ho Seong Lee ) 한국무용과학회 2015 한국무용과학회지 Vol.32 No.3

이 연구의 목적은 신체부정렬을 가진 남자 청소년을 대상으로 12주간의 수동적 신체정렬운동이 부위별 신체부정렬 및 족저압력에 미치는 영향을 알아보는데 있다. 연구대상은 신체부정렬을 가진 남자 중학생 14명을 운동군(passive body alignment exercise group; PAG, n = 7) 및 통제군(control group; CON, n = 7)으로 무작위 분류하였다. 수동적 신체정렬운동은 주3회 1일 50분씩 (준비운동 10분, 본운동 30분, 정리운동 10분) 12주간에 걸쳐서 실시하였다. 신체부정렬(머리 기울기, 어깨 높이, 골반 높이) 및 족저압력(왼발, 오른발)은 운동전과 운동 12주 후에 각각 측정하였다. PAG의 머리 기울기(F=13.060, p=.011) 및 골반 높이(F=19.753, p=.004)는 운동 전과 비교해서 운동 후에 집단 및 시기에 따른 유의한 상호작용 효과가 있는 것으로 나타났다. 또한 PAG의 어깨높이는 운동 전과 비교해서 운동 후에 집단 및 시기에 따른 상호작용에서 유의한 경향을 나타냈다(F=5.948, p=.051). 반면에 왼발 족저압력(F=3.434, p=.113) 및 오른발 족저압력(F=3.441, p=.113)은 운동 전과 비교해서 운동 후에 있어서 통계적으로 유의한 차이는 나타나지 않았다. 이상의 결과, 이 연구에서는 수동적 신체정렬운동은 청소년의 신체부정렬을 긍정적으로 개선하는 것이 시사되었다. The purpose of this study was to investigate effects of passive body alignment exercise on regional malalignment and foot pressure in adolescent male with malalignment. Fourteen middle aged men with malalignment were randomly divided to passive body alignment exercise group(PAG, n=7) and control group(CON, n=7). Passive body alignment exercise was performed for 50 min (warm up 10 min, exercise 30 min, cool down 10 min), three times a week for 12 weeks. Malalignment (head tilt, shoulder height, pelvic Height) and foot pressure were measured before and after 12 weeks each groups. In results, head tilt has showed the interaction between the group and the period and the main effect of the test(F=13.060, p=.011) and pelvic height has showed the interaction between the group and the period and the main effect of the test(F=19.753, p=.004). Whereas shoulder height(F=5.948, P=.051), foot pressure of left(F=3.434, P=.113), right(F=3.441, p=.113) did not showed a significant difference between the group and the period. Consequently, it was suggested that passive body alignment exercise showed a positive result in head tilt, pelvic height, but a negative result in shoulder height, foot pressure. Subsequent studies, conducted on a many basis, increasing the subject number are thought to obtain better results.

團地計劃의 效率化를 위한 自治行政區域 廣域化 方案

박대룡(Park Dae Ryong),박형현(Park Hyeong Hyeon),이종철(Lee Jong Chul),박진석(Park Jin Suk),김원택(Kim Won Taek),오창수(Oh Chang Soo) 대한토목학회 2000 대한토목학회 학술발표회 논문집 Vol.2000 No.4

GPGPU를 이용한 큰 정수 곱셈 고속화

최환석(Hwan-Suk Choi),박진석(Jin-Suk Park),이창건(Chang-Gun Lee) 한국정보과학회 2015 한국정보과학회 학술발표논문집 Vol.2015 No.6