미끄럼형 기계적 모델에 의한 디딤동작의 시뮬레이션

박해수,손웅희,윤용산,Park, Hae-Soo,Shon, Woong-Hee,Yoon, Yong-San 대한의용생체공학회 1989 의공학회지 Vol.10 No.3

The initial impact at foot strike is produced by a slider type mechanical model, which can be measured using a force platform to evaluate various shoes. The lower extremity and foot motion was filmed by a 16mm high speed movie camera and several points on the rear half of the shoe and those near the trochanter and the lateral epicondyle were digitized to provide the linear and angular positions and velocities during impact. With these observed kinematics, a slider type foot strike simulator composed of guide rail and sliding dummy is designed. The simulator system makes the artificial foot of the dummy with running shoe on it to follow the foot strike motion. The dummy has the relevant mass-spring-damper system modeled after McMahon's. The motion of the model is drived by the gravity force and the generated motion alone with the ground reaction forces are monitored by the same procedures afore mentioned producing the initial foot strike impact similar to the onto observed in human gait.

발계측 자료에 기초한 신골 할출 시스템의 검증에 관한 연구

박해수,Park, Hae-Soo 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.1

Shoe's size and shape are determined by the last that takes shape of foot because last is the mold of shoe in development and manufacturing process. Then adaptation between foot and shoe is dependent on the last. In mass shoe production, model size is developed in the first place, other sized lasts are made through the grading process based on model size. The most important factor in grading system is grading deviation that must be same amount induced from foot measuring database. At present, most of the last manufacturing companies in korea using 260mm as a standard foot model size. When length grading deviation is 5mm, the ball girth grading deviation is 3.7mm and the ball width grading deviation is 1.2mm. I verified existing grading system by comparing grading results with foot measuring data. Also, I proposed reasonable grading deviation and application method of grading system. From the analysis of foot measuring database, reasonable grading deviations are 1.22mm in ball width and 0.84mm in ankle height in case of length grading deviation is 5mm. I confirmed that the current grading system is very accurate. When we grade last from 230mm to 290mm by current grading system based on model size 260mm, there is grading error over 1mm in the front outside area of foot. This error level of 1mm is no problem in normal walking shoe's last, but it induces adaptation problems in sports and special purposed shoe's last. Therefore using of three standard model size is recommended in grading men's last for reducing grading deviation error under the level of 1mm. It is specifically described as 235mm in 225-245mm, 260mm in 250-270mm, 285mm in 275-295mm. According to the above recommended grading system, it is enough to measure only three foot sizes in case of foot measuring project for men's last development.

Nb2O5-Graphene나노복합체의 제조 및유기염료 광촉매 분해반응의 응용성에 관한 연구

박해수 ( Hae Soo Park ),고원배 ( Weon Bae Ko ) 한국고무학회 2014 엘라스토머 및 콤포지트 Vol.49 No.4

Niobium pentoxide (Nb2O5) 나노입자는 niobium (V) chloride 와 pluronic F108NF를 전구체와 주형제로사용하여 합성하였다. Nb2O5-graphene나노복합체는 아르곤 가스 분위기 전기로 조건에서 2시간 동안 700 ℃로가열하였다. 시료의 결정화도, 결정형태, 광촉매 분해 반응성은 X-ray diffraction, scanning electron microscopy,transmission electron microscopy, UV-vis spectroscopy를 사용하여 측정하였다. Nb2O5-graphene나노복합체는 254 nm의 자외선 조건에서 유기염료 광촉매 분해 반응의 광촉매로 사용되었다. 유기염료는 methylene blue(MB), methyl orange (MO), rhodamine B (RhB), brilliant green (BG)이 사용되었다. 또한 Nb2O5-graphene나노복합체를 사용하여 유기염료 광촉매 분해 반응의 반응 속도를 결정하였다. Niobium pent oxide (Nb2O5) nanoparticles were synthesized using niobium (V) chloride and pluronic F108NFas the precursor and templating agent, respectively. The Nb2O5-graphene nanocomposites were placed in an electric furnaceat 700 °C and calcined under Ar atmosphere for 2 h. The morphology, crystallinity, and photo catalytic degradation activity of the samples were characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, and UV-vis spectroscopy. The Nb2O5-graphene nanocomposites acted as a photo catalyst in the photo catalytic degradation of organic dyes under 254 nm UV light; the organic dyes used were methylene blue (MB), methyl orange (MO), rhodamineB (RhB), and brilliant green (BG). The photo catalytic degradation kinetics for the aforesaid dyes were determined in the presence of the Nb2O5-graphene nanocomposites.

광섬유 내의 원편광 복굴절에 관한 연구

박해수(Park Hae Soo),오상기(Oh Sang Ki),온재정(Eun Jae Jeong) 대한전기학회 2002 대한전기학회 학술대회 논문집 Vol.2002 No.7

전력선 통신을 위한 고압 배전선로 특성 파라미터 해석

이재조(Jae-Jo Lee),박해수(Hae-Soo Park),이원태(Won-Tae Lee),김관호(Kwan-Ho Kim) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7

본 논문에서는 22.9㎸ 고압 가공 배전선로를 고속 전력선 통신을 위한 통신 채널로 사용하기 위하여 전력선 통신 주파수 2㎒~30㎒ 대역에 대한 특성 파라미터를 해석하였다. 먼저 고압 배전선로에 주로 사용되는 ACSR-OC 케이블에 대한 구조를 분석하고 이의 특성 파라미터로부터 분포정수와 특성 임피던스를 구하였다. 또한 등각 사상법을 이용하여 유전체가 코팅된 평행 2선식 고압 배전선로의 정전용량 및 유효유전상수를 계산하였다. 이러한 결과를 바탕으로 고압 배전선로의 분포정수와 특성임피던스를 구하였으며, 특성임피던스는 케이블 단면적에 따라서 470Ω~530Ω 사이의 분포를 나타내었다. 특히, 특성 임피던스는 지면을 완전 전기도체로 가정할 경우에 비하여 실제 지면의 도전율과 유전상수를 고려할 때 20㎒ 이하의 대역에서 보다 높은 값을 갖는 것을 확인하였다.

편광측정법에 의한 광섬유 전류 센서 제작에 관한 연구

장남영,최평석,은재정,박해수,Jang, Nam-Young,Chio, Pyung-Suk,Eun, Jae-Jeong,Park, Hae-Soo 대한전자공학회 2004 電子工學會論文誌-SD (Semiconductor and devices) Vol.41 No.6

본 논문에서는, 편광측정법에 의한 광섬유 전류 센서(P-FOCS)를 실험·제작하여, 실제 필드에 적용할 수 있는 P-FOCS의 상용화 가능성에 대하여 연구하였다. P-FOCS는 인가된 전류에 의해 발생한 자기장에 비례하는 Faraday 회전각을 측정함으로서 인가된 전류를 측정한다. P-FOCS의 센싱 광섬유로는 저복굴절 광섬유를 사용하여 밴딩에 의한 선복굴절의 영향을 최소화하였으며, 벌크(bulk)한 광학소자의 사용으로 인한 광 손실을 막기 위해 전 광섬유 소자를 사용하였다. 또한, 구성된 신호처리회로는 광섬유 소자들의 연결부에서의 손실로 인한 출력 신호의 강도 변화를 제거하기 위해 사용된다. Faraday 회전각은, 632.8nm 파장의 광원을 이용하여 권선수가 약 1500인 솔레노이드에 전류를 인가해 7500A의 전류원의 효과를 얻도록 하여, 솔레노이드 내부에 센싱 광섬유를 통과시켜 측정하였다. $1000A{\sim}7500A$ 범위에서, 선형성의 측정 오차는 약 1.5% 이내였다. In this paper, a polarimetric fiber optic current sensor(P-FOCS) is experimented and fabricated, and then a possibility to the commercial utilization of the P-FOCS is also investigated. The P-FOCS measures an applied current by a Faraday rotation linearly proportional to a magnetic field generated by the applied current. The bending-induced linear birefringence in the sensing fiber is minimized by using the low birefringent fiber. Also, all fiber-optic components are used to avoid optical losses coming from the use of bulk components. A signal processing circuit is constructed and used to eliminate the effects of intensity variations in the output signal due to losses coming from misalignments of components such as fiber connectors. Using the optical source of 632.8nm wavelength, Faraday rotation is measured by passing through the sensing fiber within the solenoid of about 1500 turns which is equivalent to a current source of about 7500A. In the range of 1000A to 7500A, the measurement error for linearity is within about 1.5%.

자판기 시스템 운영문제의 휴리스틱 해법 개발과 평가

박양병(Yang Byung Park),장원준(Won Jun Jang),박해수(Hae Soo Park) 한국산업경영시스템학회 2011 한국산업경영시스템학회지 Vol.34 No.4

The operation of vending machine system presents a decision-making problem which consists of determining the product allocation to vending-machine storage compartments, replenishment intervals of vending machines, and vehicle routes, all of which have critical effects on system profit. Especially, it becomes more difficult to determine the operation variables optimally when demand for a product that is out-of-stock spills over to another product or is lost. In this paper, we propose a heuristic for solving the operation problem of the vending machine system and evaluate it by comparing with Yang’s algorithm on various test problems with respect to system profit via a computer simulation. The results of computational experiments show a substantial profit increase of the proposed heuristic over Yang’s algorithm. Sensitivity analysis indicates that some input variables impact the profit increase significantly.

원자력발전소 해체 방사성폐기물 처분 적합성 검증을 위한 인수기준 이행 흐름도 개발

김창락,이선기,김헌,성석현,박해수,공창식,Kim, Chang Lak,Lee, Sun Kee,Kim, Heon,Sung, Suk Hyun,Park, Hae Soo,Kong, Chang Sig 한국시스템엔지니어링학회 2021 시스템엔지니어링학술지 Vol.17 No.1

When the decommissioning of South Korea nuclear power plants is promoted in earnest with the permanent shutdown of Kori Unit 1 in 2017, a large amount of various types of radioactive waste will be generated. For minimal generation and safe management of decommissioning waste, the waste should be made by appropriate classification of the dismantling waste characteristics in accordance with physical, chemical and radiological characteristics to meet the acceptance criteria of disposal facilities. Replacing the preliminary inspection at the site for the compliance of the waste acceptance criteria (WAC) of medium and low-level radioactive waste with the generator's own radioactive waste certification program (WCP), from the perspective of disposal, the optimization of waste management at the national level contributes to the efficient availability of disposal, such as the processing of non-conforming radioactive wastes at the site. To this end, it is important to evaluate radioactivity in each system and area such as nuclear reactors before decommissioning is carried out in earnest, and the prior removal of harmful wastes is important. From waste collection to waste disposal, decommissioning waste should be managed at each stage in consideration of the acceptance criteria of disposal facilities to minimize the generation of non-conforming waste.

평일과 주말의 특성이 결합된 연휴전 평일에 대한 단기 전력수요예측

박정도(Jeong-Do Park),송경빈(Kyung-Bin Song),임형우(Hyeong-Woo Lim),박해수(Hae-Soo Park) 대한전기학회 2012 전기학회논문지 Vol.61 No.12

The accuracy of load forecast is very important from the viewpoint of economical power system operation. In general, the weekdays’ load demand pattern has the continuous time series characteristics. Therefore, the conventional methods expose stable performance for weekdays. In case of special days or weekends, the load demand pattern has the discontinuous time series characteristics, so forecasting error is relatively high. Especially, weekdays near the thanksgiving day and lunar new year"s day have the mixed load profile characteristics of both weekdays and weekends. Therefore, it is difficult to forecast these days by using the existing algorithms. In this study, a new load forecasting method is proposed in order to enhance the accuracy of the forecast result considering the characteristics of weekdays and weekends. The proposed method was tested with these days during last decades, which shows that the suggested method considerably improves the accuracy of the load forecast results.

2단계 VMI 공급사슬에서 통합 재고/차량경로 문제를 위한 유전알고리듬 해법

박양병(Yang-Byung Park),박해수(Hae-Soo Park) 대한산업공학회 2008 대한산업공학회지 Vol.34 No.3