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Stiffness Enhancement of a Redundantly Actuated Parallel Machine Tool by Dual Support Rims
신현표,정재일,김선호,김종원 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
A novel kinematic structure called as the Eclipse-IA is suggested for an application to the parallel machine tools. The stiffness enhancement design based on the Eclipse-IA structure is also introduced with its stiffness analysis for redundantly actuated parallel mechanisms. Relationship between the new structure and the stiffness properties including determinant and isotropy of the corresponding stiffness matrix is examined. Moreover, the design parameters are optimized to maximize the stiffness properties for the application of the Eclipse-IA as a multi-functional machine tool. By various simulation cases, the suggested parallel mechanism and the redundant actuation are verified to increase the stiffness properties against arbitrary external forces.
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신현표 한국산업경영시스템학회 1987 공업경영학회지 Vol.10 No.16
Since many small and medium sized enterprises have lack of funds to install the full scale Computer Aided Process Planning this study has been attempted to develop a part of computer generated production information system for a start. The system is programmed by DBASE III and BASIC languages for the IBM-PC competables for the sake of user's convenience. The system consisted of four major parts. The first part is a computerized work measurement system for applying WF predetermined time standards. The second part is a computerized forecasting and loading system for applying various statistical techniques. The third part is a GT scheduling system programmed by BASIC for applying heuristic scheduling method. Finally, the last part is a simulation system for GT scheduling efficiency test which is programmed by SIMAN simulation language.
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신현표,최정민 대한건축학회 2022 대한건축학회논문집 Vol.38 No.8
Since the international community adopted the Kyoto Protocol, which obliges developed countries to solve the climate change problem in 1997, Korea has ratified the 2015 Paris Agreement, which involves both developed and developing countries on November 3, 2016. In October 2021, the 2050 Carbon Neutral Scenario and the 2030 National Greenhouse Gas Reduction Goal were reviewed and resolved, and in 2050, the National Greenhouse Gas Reduction Goal (NDC) was significantly raised from the previous reduction target of 26.3% to 40% compared to 2018. Accordingly, in the case of the building sector, the goal is to reduce to 35.0 million tons (32.8% compared to 2018) in 2030 and 6.2 million tons (88.1%) in both A and B plans in 2050. In order to implement these reduction targets, it is basically necessary to confirm the energy usage, greenhouse gas emissions based on the characteristics of each use of the building, and the possibility of greenhouse gas reduction targets in 2030 and 2050. For example, buildings are largely divided into residential and non-residential use, and residential use can be divided into two types of detached houses and multi-family housing, and non-residential use can be classified into 28 types. Basic data on the characteristics of energy use by building use can be obtained from Green Together (greentogether.go.kr) of the Ministry of Land, Infrastructure and Transport. This data provides data on building energy usage for four years from 2018 to 2021, but does not provide data on greenhouse gas emissions. Therefore, in this study, based on Green Together's energy usage data, the characteristics of greenhouse gas emissions by building use were examined, and through this, basic data were presented on how to achieve the reduction goal of the building sector in 2030 and 2050. 국제사회가 기후변화 문제 해결을 위해 1997년에 교토의정서를 채택한 이후, 2015년에는 우리나라도 선진국과 개도국이 모두 참여하는 파리협정을 2016년 11월 3일 비준한 바 있다. 2021년 10월에는 ‘2050 탄소중립 시나리오안’과 ‘2030 국가 온실가스 감축목표 상향안’을 심의·의결하여 2030년 국가 온실가스 감축목표(NDC)를 2018년 온실가스 배출량 대비 26.3% 감축에서 40% 감축으로 대폭 상향하였고, 2050년에는 2018년 대비 배출량을 88.1% 감축하는 시나리오를 확정한 바 있다. 이에 따라 건물부문 경우 2018년 52.1백만톤 전환부분을 제외한 경우로 전환부문 포함시 179.2백만톤임 배출 기준 대비 2030년에는 35.0백만톤(2018년 대비 32.8% 감축), 2050년에는 A, B안 모두 6.2백만톤(88.1%)의 감축 목표를 제시하고 있다. 이러한 감축 목표 이행을 위해서는 기본적으로 건물의 용도별 특성을 고려한 에너지 사용량과 이에 기초한 온실가스 배출량 및 2030년, 2050년 기준의 온실가스 감축목표에 대한 가능성 확인이 필요하다. 예로서, 건물은 크게 주거용과 비주거용으로 구분되며, 주거용은 단독주택과 공동주택의 2종, 비주거용은 제1종 근린생활시설 등 28종으로 세분할 수 있다. 이러한 용도별 에너지 사용량 및 이를 근거로 온실가스 배출량 산정이 이루어질 필요가 있다. 이러한 건물 용도별 에너지 사용량 특성에 대한 기본적인 자료는 국토교통부의 녹색건축 통계인 그린투게더(greentogether.go.kr)에서 얻을 수 있다. 이 데이터는 2018년에서부터 2021년까지 4개년간 건물 에너지 사용량 데이터를 용도별로 제공하고 있으나, 온실가스 배출량에 대한 데이터는 제공하고 있지 않다. 따라서 본 연구에서는 그린투게더의 에너지 사용량 데이터를 기초로, 건물 용도별 온실가스 배출량 특성에 대해 살펴보고, 이를 통해 2030년과 2050년의 건물부문의 감축 목표 달성을 위한 관련 기초자료 제시를 목표로 진행하였다.
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JTL시스템 적용에 의한 생산성향상 효과의 시뮬레이션 분석
신현표,구일섭 한국산업경영시스템학회 1995 한국산업경영시스템학회지 Vol.18 No.34
The objective of this study is to develope an effectiveness measurement technique for U-shaped JIT production line by computer simulation. A small and medium sized automobile brake master cylinder manufacturing plant is studied for productivity improvement The production line is analysed and improved by applying Low Cost Automation, special jigs and fixtures, and facilities layout changes. An experimental simulation model is built using SIMAN(SIMulation ANalysis) simulation software for the production system analysis.
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신현표,김용범 대한설비관리학회 1998 대한설비관리학회지 Vol.3 No.1
The objective of this paper is to develop a scheduling system for job-shop under flexible manufacturing system on the on-line, real time manufacturing situation. The scheduling mechanism consists of two modules: the parts input sequence(PIS)module and the heuristic dispatching algorithm(HDA) module. PIS decides the part input piorities of the different orders to the system. The analytic hierarchy process is applied to give the loading priorities to the parts to process which conceives many different characteristics. HDA is a heuristic dispatching algorithm which use concepts of the system utilization rate and lateness rate. The program performance is evaluated by the following four criteria such as makespan, mean flow time, tardiness, and number of tardy jobs.
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