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PRT 차량용 수직이송장치의 개발을 위한 구조강도 평가
강석원,엄주환,정락교,송준현,Kang, Seok-Won,Um, Ju-Hwan,Jeong, Rag-Gyo,Song, Joon-Hyun 대한기계학회 2015 대한기계학회 논문집. Transactions of the KSME. C, 산업기술과 혁신 Vol.3 No.3
본 논문에서는 PRT(Personal Rapid Transit) 차량의 수직이송을 위한 장치를 개발하는 과정에서 수행된 주요 구조물의 정적 구조적 안전성 평가 결과를 다룬다. 지금까지 노선상에서 승객이 탑승한 상태에서 운영중인 차량의 수직이송에 대한 연구는 전무하며, 이는 기존의 2 차원 적인 교통운영 체계의 한계를 극복하는데 기여할 수 있을 것으로 기대된다. 특히, 본 연구에서 제안된 수직이송장치는 순환컨베이어 방식으로 연속 이송이 가능해서 통행량이 많은 지역에도 적용이 가능하다. 본 시스템이 물류분야에서 많이 사용되어 왔지만, 수직이동 시 차량의 무게에 의한 하중은 일반적인 물류의 수송과는 다르게 집중하중 형태로 컨베이어에 가해지기 때문에 이에 대한 구조적 안정성 평가는 필수적이다. 본 논문에서는 상용 유한요소 해석 프로그램인 $Ansys^{(R)}$를 이용해서 수직이송 장치의 기본 설계(안)의 구조적 안정성을 수치해석적 방법에 의해 평가하고자 한다. This paper presents numerical results of static structural stability analysis in development of a vertical transfer device of a PRT(Personal Rapid Transit) vehicle. The vertical transfer of a fully occupied vehicle operating on a road network is the first attempt, which is expected to contribute to overcome the limitations of conventional 2-dimensional operation mode. In particular, the vertical transfer apparatus designed based on vertical circulating conveyors is capable of continuous transfer without time delay so that it enables to accommodate a high traffic density. This system has been frequently used in a logistics field; however, it is essential to assess a structural integrity because an external force by a vehicle weight is exerted on the conveyors in the form of a concentrated load unlike a conventional logistic transport. In this study, prior to the production process, the structural performance of the pilot design in an early stage is numerically evaluated using the commercial finite element method (FEM) solver (i.e., $Ansys^{(R)}$).
강석원,정길생 ( Seok Won Kang,Kil Saeng Chung ) 한국축산학회 1976 한국축산학회지 Vol.18 No.2
This experiment was carried out to clarify the seasonal changes in general characteristics such as semen volume, sperm concentration, sperm motility, sperm abnormality and pH of the semen collected from Korean native goats by the method of electrostimulation. The results obtained in this experiment were as follows: 1. Semen volume per ejaculation was increased with decreasing daylight and the reverse was true fur the incensing daylight; average semen volume per ejaculation of November, December and January was 0.95㎖ and that of July, August and September was 0.50㎖. Significant difference (P$lt;0.05) between those two volumes was observed: 2. Seasonal changes in sperm concentration was reciprocal to those of semen volume. Average sperm concentration of July, August and September was 16.02×10^8/㎖, and that of November, December and January was 9.86×10^8/㎖ and there was also significant difference (P$lt;0.05) between those two concentration. 3. Sperm motility was changed in parallel with the variation of semen volume per ejaculation; average sperm motility of November, December and January was 83.30 and that of July, August and September was 55.10 as motility index, and significant difference (P$gt;0.05) between those two values was observed. 4. Sperm abnormality was also changed in parallel with semen volume; average percentages of abnormal spermatozoa during November, December and January were higher than those of the other months. 5. The pH of ejaculated semen was ranged from 6.80 to 7.20 throught the year and no remarkable variation acording to season was observed. 6. Significantly high (P$lt;0.01) negative correlations between semen volume and sperm concentration, sperm concentration and sperm motility, sperm concentration and sperm abnormality was observed. And there was also positive correlation between semen volume and sperm motility, semen volume and sperm abnormality, semen volume and pH, and sperm motility and pH. 7. It was clarified by those results that the reproductive activity of Korean native goat was activated by the increasing daylight began from November to January in Korea.
강석원(Kang, Seok-Won),엄주환(Um, Ju-Hwan),정락교(Jeong, Rag-Gyo),김종석(Kim, Jong-Suk) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.6
수요응답형 순환교통시스템(Personal Rapid Transit: PRT)은 자동차에 버금가는 승객의 요구 대응성 및 최적 경로 운행으로 인한 높은 효율성 등의 특징 때문에 미래형 신교통수단으로서 많은 주목을 받아 왔다. 하지만 수송 분 담 능력(4~6명)에 비해 건설비가 많이 들어가고 기존에 운용되고 있는 타 대중교통시스템과의 역할 분담 문제 때문에 적용에 한계가 있는 것도 사실이다. 따라서 본 연구에서는 도시 내 유연한 운용과 타 교통수단과의 연계를 목적으로 PRT 차량을 위한 수직이송장치를 개발하였다. 기존의 물류 분야에서 많이 채택되고 있는 순환 컨베이어 방식을 응용 하였으며, 특히 연속이송이 가능하며 사이클 타임이 적은 장점이 있다. 이와 더불어 1/10 스케일의 모형의 제작을 통 하여 장치의 기술적인 운용 가능성을 확인하였으며, 이를 통해 구조적 안정성을 확보하기 위한 방안을 도출하였다. The Personal Rapid Transit(PRT) system has been highly interested in future transportation developments due to its on-demand and optimized door-to-door transport capability. However, the major impediments to the commercialization of PRT are the high cost for construction of infrastructures as opposed to the small transport capacity and difficulty in defining the role of PRT in building a balanced transportation system. In this study, the vertical transfer device for the PRT vehicle is developed to provide more flexible and better compatible urban mobility services between means of transportation, which is expected to meet particular demands in a particular environment. This apparatus was initially designed based on the basis of vertical circulating conveyors with steel chains, which is frequently used in logistics. Its advantages are capable of the non-stop loading and reduced head-way time. Most importantly, it was intensified by the additional idea to ensure the stable and reliable transfer of the PRT vehicle fully loaded with passengers. The 1/10-scale prototype was successfully tested to demonstrate a fundamental mechanism of vertical transfer and identify unexpected user requirements prior to a real manufacturing process.