• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.26 no.1
• /
• pp.63-68
• /
• 2016

This research investigates the deployment time of an active hood lift system(AHLS) activated a gunpowder actuator for the passenger vehicle. The deployment time of the system is investigated by changing the principal design parameters of the system. In order to achieve this goal, after introducing the geometric structure and operating principle of the AHLS, the dynamic equations of the system are formulated for deploying motion. Subsequently, using the dynamic equations, the deployment time of the system is determined by changing several geometric design parameters such as location of actuator. It is then identified which design parameters are main factors to affect the deployment time of AHLS.

• Proceedings of the KIEE Conference
• /
• 2008.07a
• /
• pp.1724-1726
• /
• 2008

본 연구는 릴레이의 코일 접점 신호의 검출을 송신기에서 코일의 데이터를 검출하고 4-20mA데이터를 1/5,000까지의 분해능으로 환산하되 블루투스를 이용한 무선통신으로 전송할 수 있도록 하여 송신기의 각 코일에서 검출된 데이터 값을 인디케이터에 전송하고 다시 릴레이 코일 신호로 만들어 표시하고 제어하도록 한 것이다. 데이터의 전송은 1Port 에서 10 Port까지 릴레이 코일 및 4-20mA 물리량을 이용하여 검출대상의 접점 리액턴스를 각각 측정하여 블루투스를 이용한 무선통신 데이터 값을 송신하는 코일의 접점 송신수단과 상기 릴레이 접점 송신수단으로부터 전송된 데이터 값을 블루투스를 이용하여 무선통신으로 수신한 후, 상기 릴레이 접점에서 전송된 각각의 데이터 값과 전체 물리량으로 연산 처리된 데이터 값을 디스플레이 하고, 데이터의 디스플레이된 값을 통해 리액턴스 출력, 경보음출력, RS232, 4-20mA 출력이 발생되게 하는 인디케이터로 구성하는 블루투스를 이용한 10 Port 코일 리프트 제어 콘트롤러이다.

• Transactions of the Korean Society of Mechanical Engineers A
• /
• v.32 no.1
• /
• pp.91-98
• /
• 2008

One of the two spindles in the X-lift fractured suddenly during normal operation. The fracture occurred at the notch where the bending moment might be the maximum. Macrofractographic features associated with rotating-bending fatigue are evident on the fracture surface. The 3-D finite element analysis of the X-lift reveals that the spindle rotated under bending. The measured surface strain of the spindle varies cyclically as the spindle rotates. It supports that the spindle rotated under bending. The X-lift is not perfectly symmetrical with respect to both the horizontal and the vertical plane. The slightly unsymmetrical deformation can cause the bending of the spindle.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2017.05a
• /
• pp.260-261
• /
• 2017

The objective of this study is to propose the basic design plan of system by comparing and analyzing application environment of lift and elevator group control system, as preliminary study for the application of group control system to lifts for high-rise construction. The basic design plan is suggested in terms of group control algorithm, hall call system type, operation information recording device, information communication method, and operation method. The results of this study can be used as basic data for software and hardware design for application of group control technology of lifts for super tall building construction and ultimately contribute to improve the operation efficiency of lift for high-rise construction.

• Bulletin of the Korean Institute for Industrial Safety
• /
• v.2 no.1
• /
• pp.31-33
• /
• 2002

국내 사업의 현대화와 아울러 건설에서는 고층화가 이루어지고 있으므로 이에 따른 리프트 및 크레인이 다양하게 많이 사용되고 있고 더욱 사용빈도가 빈번하게 이루어지는 추세이므로 이에 따라 산업재해도 여러 형태로 빈번히 발생이 되고 있는 경향이다. 또한 장치 산업인 산업설비가 발전함에 따라 고압압력용기가 초고압으로 변하여가고 있으므로 이에 따라 발생되는 사고의 영향은 이미 많은 사고 사례에서 볼 수 있는 것과 같이 중대재해가 발생된다. 이에 대한 사고 방지를 위한 검사 기준도 새로운 현실에 적합한 기준개정이 필요하게 되었다. 그러므로 유해·위험한 기계·기구 및 설비의 검사 기준인 리프트, 크레인 및 압력용기 제작기준·안전기준 및 검사기준을 최근 새로운 국내의 실정에 따라 이에 적합하도록 개정이 필요하게 되었다. 특히, 지진 등으로 인한 대형사고를 예방하기 위하여 지진하중 등에 관한 검사항목을 보완한 것에 대한 개정전후의 비용편익분석을 실시하여 개정으로 인하여 관련사업장의 미치는 영향을 확인하고, 편익분석을 함으로서 손익을 정확히 판단하는 것이 기업주나 정책입안자에게 매우 필요하다 하겠다.(중략)

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2016.05a
• /
• pp.64-65
• /
• 2016

According to the recent increase in the height of supertall buildings, construction lift became one of most important equipment for vertical transportation of resources. However, increase in lifting load during peak time in which the resources are concentrated often causes a risk of construction delay. This study suggests a concept of Double-Cage construction lift, which is a lift with two cages attached together allowing transportation of resources on two consecutive work floors simultaneously. The aim of this study is to present a simulation model suitable for calculating hoisting time of Double-Cage construction lift. The proposed model is expected to be utilized when applying Double-cage construction lift for its efficient operation and management.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2016.05a
• /
• pp.160-161
• /
• 2016

In tall building construction, lift car for worker lifting is a critical factor for construction productivity. To reduce worker lifting time, existing researches have been conducted on lift car planning. While, research on lift car operation is insufficient. For the efficient reduction of worker lifting time, lift car operation control is needed with lift car planning. Therefore, this research suggests operation control model of lift car to reduce worker lifting time. According to the result of a model test, the operation control model contributes to reasonable reduction of worker lifting time.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2018.05a
• /
• pp.6-7
• /
• 2018

Although the importance of the construction lift is increasing, no improvements are being made to its operating system. This study proposed an optimal call-response algorithm of the construction lift for high-rise building construction by using image sensing technology, height measuring sensor, and load cell. This algorithm makes turn-around decision of the construction lift by considering the information and the number of user. It occurs when the call comes from a floor where the construction lift already have passed. The purpose of this study is to reduce the total latency of the construction lift user. Furthermore, it is possible to prevent delay in construction duration by carrying out a priority operation of the construction lift for the critical workforce.

• Journal of the Korea Institute of Building Construction
• /
• v.8 no.3
• /
• pp.119-125
• /
• 2008

The volume of material and number of workers mobilized has been on the rise in line with the domestic projects getting higher, larger and complex currently. Particularly for the project in downtown, delivering the resources in timely manner is very crucial in carrying out the overall project as scheduled. Inappropriate lifting plan often causes inefficiency over the entire project, resulting in increase in schedule and cost. Despite of such importance of lifting plan for architectural work, lifting plans at the most of domestic projects, except a few cases for large scale high-rise buildings, have been heavily dependent on engineer's personal experience and intuition alone. To deal with such problems, the study was intended to develop and suggest a systematic and objective process for determining the lift, categorizing the lifting equipment into the two types, one for workers and another for material.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2013.05a
• /
• pp.171-172
• /
• 2013

An operation planning of lift car is crucial in tall building construction especially it's arrangement plans, because it is related with transportation distance of finishing materials affecting construction productivity. Since tall building construction, composed of complicating and huge plane have complex traffic lines of finishing materials, to determine the position of lift car empirically or intuitively has limits. Therefore this paper suggest an optimum layout model of lift car minimizing the transportation distance both at site-level and floor-level using Graph theory and Dijkstra algorithm.