• Steel and Composite Structures
• /
• 제4권1호
• /
• pp.49-75
• /
• 2004

The paper derives, validates and illustrates the application of GBT-based formulae to estimate distortional critical lengths and bifurcation stress resultants in cold-formed steel rack-section columns, beams and beam-columns with arbitrarily inclined mid-stiffeners and four support conditions. After a brief review of the Generalised Beam Theory (GBT) basics, the main concepts and procedures employed to obtain the formulae are addressed. Then, the GBT-based estimates are compared with exact results and, when possible, also with values yielded by formulae due to Lau and Hancock, Hancock and Teng et al. A few remarks on novel aspects of the rack-section beam-column distortional buckling behaviour, unveiled by the GBT-based approach, are also included.

• 한국화재소방학회논문지
• /
• 제34권1호
• /
• pp.26-36
• /
• 2020

랙크식 창고 화재의 경우 랙크에 적재된 가연성물품사이의 송기공간을 통한 급격한 화재확산으로 인해 화재진압이 매우 어렵다. 현재 국내 랙크식 창고의 소방시스템은 많은 문제점이 있으며, 이를 해결하기 위하여 새로운 소방시스템을 설계되고 개발되었다. 극 초기감지와 화재발생위치정보를 얻기 위하여 감지기 네트워크와 인공지능을 활용한 지능형 시스템을 설계되었다. 극초기에 화재 위치 인근에서 살수가 가능하도록 수직 일제살수 배관과 습식배관, 그리고 전자밸브를 사용하여 시스템을 구성하였다. 설계 결과를 기반으로 실제 시스템의 설치 및 실대형 시험을 진행하였으며, 성공적으로 시험이 완료되었다.

• Kyungpook Mathematical Journal
• /
• 제60권2호
• /
• pp.279-288
• /
• 2020

Niebrzydowski and Przytycki conjectured that the torsion of rack and quandle homology of a dihedral quandle of order 2k is annihilated by k, unless k = 2^t for t > 1. We partially prove this conjecture.

• 한국산학기술학회논문지
• /
• 제20권5호
• /
• pp.13-19
• /
• 2019

후쿠시마 원전사고 이후 비상 배터리 시설에 대한 안전성 강화가 요구되면서 리튬 폴리머 배터리를 적용한 새로운 전원 공급장치가 국내에서 세계 최초로 제안되었다. 그러나 제안된 기술을 현장에 적용하기 위해서는 배터리 장치가 설치되는 랙 시스템의 내진 안전성이 요구된다. 본 연구에서는 세계 최초로 72시간 용량 확보를 위해 개발 된 리튬폴리머 배터리 장치를 대상으로 지진 발생 시 전원장치의 안전성을 확보하기 위해 설계 된 전원장치 스트링 및 랙 프레임에 대한 내진성능을 평가하고자 하였다. 실험 결과 1) 단위 랙 시스템의 공진대역은 9 Hz로서 지진하중 전 후의 고유진동수가 변하지 않음에 따라 설계지진하중에 대한 부재 및 부재간의 연결부에 대한 안전성을 확인할 수 있었다. 원전 설계기준 OBE와 SSE에서의 가속도 응답 결과 2) 스트링 제작에 의한 진동 저감 효과가 약 20%정도 보였으며, 3) OBE, SSE 조건에서의 내진시험 결과 랙 프레임 시스템은 설계지진에 대해 안전한 것으로 나타났다. 따라서 본 연구에서 제시한 랙 시스템은 요구 지진력에 대한 구조적 건전성이 입증되었으므로 원전 시설에 적용이 가능한 것으로 나타났다.

• Journal of Microbiology
• /
• 제33권2호
• /
• pp.128-131
• /
• 1995

Using differential hybridization, we selected the prk gene fortuitously from Schizosaccharomyces pombe homologous to RACK1 of rat which encodes the receptor for activated protein kinase C. The cDNA sequence of prk was determined and its deduced amino acid sequence was 76% homologous to RACK1 and had the feature of trimeric G protein bata subunit. The specific amino acid sequences required for the protein kinase C binding were also present in Prk as in the case of RACK1 protein. From these similarities, we suggest that the Prk is protein kinase C binding protein of S. prombe. The involvement of Prk in signal transduction mediated by protein kinase C remained to be studied.

• Nuclear Engineering and Technology
• /
• 제18권1호
• /
• pp.17-26
• /
• 1986

연소를 고려하는 사용후핵연료저장조의 핵임계 안전성 분석에서 검증용 계산 체제와 rack계산 체제 사이의 편차를 신뢰성 있게 결정하는 방법을 시험하였다. 이를 위하여 고리 1호기의 사용후핵연료저장조를 연소를 고려하는 가장 조밀한 rack으로 개념설계하고, 핵연료의 농축도 및 연소도에 따라 증배계수를 계산하였다. 표준값 생산용 Monte Carlo 코드로는 KENO-IV를 그리고 실제 rack 설계용으로는 2차원 충돌화률 코드인 FATAC을 사용하였다. 이 두 계산의 결과를 상호 비교하여 계산 체제 사이의 편차와 이의 경향성 및 신뢰도를 평가하였다. 이 방법을 사용하면 확실한 신뢰도 근거를 마련할 수 있을 뿐만 아니라 반응도 여유면에서 기존의 방법보다 불리하지 않음이 입증되었다.

• 대한한방내과학회지
• /
• 제19권2호
• /
• pp.28-36
• /
• 1998

Background : Yang-do-rack is frequently used in diagnosing syndromes in oriental medical hospital, but there has been few clinical report on Yang-do-rack. So we intended to find out the relationship among Yang-do-rack, general characteristics and the differentiaion of syndromes in acute stroke patients. Materials and Methods : In this study we selected the subjects who were hospitalized from March 1, 1998 to July 31. 1998 at the department of circulatory internal medicine at college of oriental medicine, in Kyung-Hee University, diagnosed acute cerebral infarction or hemorrhage within 7 days after onset time. We checked Yang-do-rack scores with Autonomic Nervous System YORAK (Sord Medicom co. Ltd, Korea) and calculated the scores of each diffentiation of syndroms. Resuts : 1. In left leg meridian, there was more numerical value male than female on LF1, LF2, LF4, LF6. The value of LF1, LF3, LF4, LF5 was getting lower as the score of heat-transformation syndrom(火熱證) increased. 2. In left arm meridian, there was more numerical value male than female on LH2, LH5. The value of LH1, LH3, LH5 was getting lower as the score of exuberance of Yang due to deficiency of Yin syndrom(陰虛陽亢證) increased. 3. In right leg meridian, there was more numerical value male than female on RF1, RF2, RF4, RF6. The value of RF3, RF5 was getting lower as the score of heat-transformation syndrom(火熱證) increased and RF4 as the score of exuberance of Yang due to deficiency of Yin syndrom(陰虛陽亢證) increased. 4. In right arm meridian, the value of RH1 was getting lower as the score of exuberance of Yang due to deficiency of Yin syndrom(陰虛陽亢證) increased. These results show that the Yang-do-rack diagnosis could offer supplemental help for diffrentiation of syndroms in acute stroke patient.

• 산업경영시스템학회지
• /
• 제32권1호
• /
• pp.44-51
• /
• 2009

A bonded warehouse is the warehouse located in bonded area. It functions not only as a general warehouse but also as a place for managing the work related to import and export bonded goods. As a general warehouse, it uses the rack system to store the goods and the folk lift truck to move the unitized goods. The operation of the storing system closely related to the efficiency of space uses in a warehouse and vehicle working. Thus, vehicle performance measured in distance units in the ware-house could be used as one of the key performance measure in warehouse system. This paper focuses on the operation efficiency of the bonded warehouse which uses rack system for the storing and the folk lift truck for moving goods. The method of load allocation for balancing the rack uses and vehicle operation for maximizing efficiency are the specific concerns in this paper. The simulation study is conducted to find a policy for efficient vehicle operation based on balanced rack utilization, and the favorable result for the system operation would lead the usable proposal in vehicle operation.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
• /
• pp.167.1-167.1
• /
• 2011

Sustainable energy generation is becoming extremely imperative due to the expected limitations in current energy resources and to reduce pollution. Especially, because of its considerable energy potential, ocean wave energy has been investigated with regard to power generation. To develop large high power wave generator system, it is important to make a small scale proto type and to test that. Thus the objective of this research is to examine the characteristics of a mechanically excited generator system having small power capacity experimentally. The water reservoir (4 m length, 1.5 m width and 1.8 m depth) having a wave maker to make arbitrary height and period of the water wave was made. The proto type consists of three main parts; a buoy, rack-pinion base one-way mechanism, and a wave generator(Fig.1). The water wave is going up and down and the hexahedron buoy is following the wave. The rack gear attached to the buoy is also going up and down to roll the pinion connected to an electric generator then it produces electricity. The experiments were performed with several conditions of water waves, and the power outputs over 30 W could be measured for some conditions. In future works, to achieve higher performance for the proto type, the effects of primary parameters (buoy shape and mass, etc.) on the system efficiency will be identified.

• 대한산업공학회지
• /
• 제14권1호
• /
• pp.31-42
• /
• 1988

This paper studies class-based turnover assignment rule in terms of the expected travel time in automated storage/retrieval systems (AS/RS). With the rack face not necessarily in square in time, travel time models of two and three-class systems are developed, from which class partition values are determined for single command cycle. Also, the effects of the system parameters such as the rack shape factor and the skewness of the ABC curve are evaluated on the travel time through example problems.