• 산업경영시스템학회지
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• 제46권spc호
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• pp.61-67
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• 2023

Special equipment used for snow removal is only used in the winter and must be moved into storage during non-winter seasons. However, when moving heavy equipment using a forklift within a limited space, safety accidents may occur due to deformation and damage due to the worker's limited visibility and excessive loading of heavy objects. In this study, the scissors boom of the developed heavy load transporter was conducted in two cases: link structural analysis and position-based structural analysis. In detail, the link structural analysis covers four cases of stress and safety factor according to material and thickness to optimize the specifications of the material selected during development, and the structural analysis according to position covers two cases before and after the lift, when maximum stress concentration is achieved. Safety was evaluated through finite element analysis. As a result of the study, when manufacturing a scissors boom type heavy load transporter that can withstand a load of 10 tons, the link showed safety at SS400 4.5mm or higher, and reinforcement is needed in the upper and lower structures, so it is judged to be useful in applying materials according to the load.

• 지질공학
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• 제20권3호
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• pp.257-269
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• 2010

본 연구에서는 급경사지재해 안정화기술 분야에 관하여 한국, 미국, 일본 및 유럽에서 출원 공개/등록된 특허를 중심으로 특허동향을 분석하였다. 중분류는 예측기술, 계측기술, 대책/보강/저감기술, 실내실험과 같이 4개로 분류하였으며, 2,134건의 최종 유효 분석대상 특허를 선별하였다. 특허건수와 출원인수의 상관관계를 이용한 포트폴리오 분석결과 한국 및 미국의 경우 발전기 단계에 있으며, 일본과 유럽의 경우 퇴조기에 있는 것으로 분석되었다. 한국의 경우 국가주도의 연구 활동으로 인하여 특허활동이 활발한 것으로 분석된다. 중분류 기술 분야별 분석 결과, 일본은 급경사재해 예측분야, 미국은 급경사재해 실내실험분야가 각 국가의 경쟁력 분야인 것으로 분석되었으며, 한국의 경우 급경사재해 예측과 급경사재해 실내실험 분야가 공백기술인 것으로 분석되었다. 분석결과를 토대로 기술별 향후 연구개발 방향을 정리하면 예측기술 분야에서는 신규 유한요소해석 방법 또는 수치해석 모델 정립이 필요하고, 계측기술 분야에서는 센서개발기술, 정보취합을 통한 재해예측기술, IT기술과 융합을 통한 장치관련 기술 등이 필요하다. 그리고 재해/대책/저감기술 분야에서는 기존 사방구조물의 개량, 차별화된 사면보강공법 등의 개발이 필요하며 실내실험분야에서는 새로운 최적화된 구조의 실험장치 또는 방법의 개발이 필요한 것으로 조사되었다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제9권8호
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• pp.171-180
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• 2020

스마트 팩토리는 설계, 개발, 제조 및 유통 등 생산과정 전반이 디지털 자동화 솔루션으로 이루어져 있으며, 내부 설비와 기계에 사물인터넷(IoT)을 설치해 공정 데이터를 실시간으로 수집하고 이를 분석해 스스로 제어할 수 있게 하는 지능형 공장이다. 스마트 팩토리의 장비들은 게임과 같이 가상의 캐릭터가 하나의 객체 단위로 구동되는 것이 아니라 수많은 하드웨어가 물리적으로 조합되어 연동한다. 즉, 특정한 공동의 목표를 위해 다수의 장치가 개별적인 행동을 동시다발적으로 수행해야 한다. 공정 데이터를 실시간으로 수집할 수 있는 스마트 팩토리의 장점을 활용하여, 일반적인 기계 학습이 아닌 강화 학습을 사용하면 미리 요구되는 훈련 데이터 없이 행동 제어를 할 수 있다. 하지만, 현실 세계에서는 물리적 마모, 시간적 문제 등으로 인해 수천만 번 이상의 반복 학습이 불가능하다. 따라서, 본 논문에서는 시뮬레이터를 활용해 스마트 팩토리 분야에서 복잡한 환경 중 하나인 이송 설비에 초점을 둔 그리드 분류 시스템을 개발하고 협력적 다중 에이전트 기반의 강화 학습을 설계하여 효율적인 행동 제어가 가능함을 입증한다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.1786-1792
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• 2011

If the concrete track is settled excessively, it must be restored or reinforced immediately. Especially, reinforcement/restoration method should be applied without affecting on train operation. To deal with this problem, special equipment, process and material should be prepared. This paper suggest a special mixing ratio to restore the settled concrete track. Materials are classified the quick hardening mortar and the middle hardening mortar. The quick hardening mortar is used to restore the settled track and the middle hardening mortar is used to fill the void. These materials must have the appropriate gel time(1-40sec) and compressive strength($5kg/cm^2$). Various compounds is used and the micro cement is used as a main base.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 춘계학술대회 논문집
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• pp.462-469
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• 2011

The design of high-depth and large-section tunnel facilities has been increased lately. The purpose of the design is to avoid inference of existing facilities, enhance public relations and reducing the size of the station, which is advantageous for effective use of underground spaces. Diverse downtown tunnel experience, advanced excavation equipment, reinforcement methods, monitoring technologies and numerical analysis made the design possible. This paper is to introduce the design of high-depth and large-section tunnel facilities via Gimpo airport area of Deagok-Sosa railway BTL project of double-tracking.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2001년도 춘계학술발표대회 논문집
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• pp.34-37
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• 2001

This study developed Fiber/Particle Hybrid MMCs and analyzed their mechanical properties. Using $\textrm{Al}_2\textrm{O}_3f$ and $\textrm{Al}_2\textrm{O}_3p$ with the fiber to particle ratio of 1:1, 1:3, 1:5 hybrid preform and MMCs are fabricated. For the analysis of the mechanical properties, three point bending tests were preformed for the preform and tensile test for the MMCs. The experimental results show that the hybrid MMCs can be successfully fabricated using the equipment of fiber preform fabrication system and squeeze casting method. And as the amount of particle in hybrid MMCs increases, the tensile strength, elastic modulus and the volume fraction of reinforcement increases.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2006년도 추계학술대회 논문집 전력기술부문
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• pp.30-32
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• 2006

New building, reinforcement, maintenance and test of power equipments are always necessary in a power system. Our power system is getting old and the total power capacity is also getting large, so power equipment outages are getting often. Power euipment outages make less margine for a stable condition of a power system operation. Therefore, through overviews and countermeasures against the outage should be made in order to be in a stable operational conditions during the outage. We have too many outages over 300 per month in our power system. So, we can't have enough time to study our power system and to make countermeasures without a helping program. This program is designed to give various and appropriate informations necessary for an outage scheduling. By applying this program, we can raise the job efficiency high and spare the time spent. So we can afford to do through system studies and make good countermeasures. I think this program can contribute greately to power system stable operation.

• 시큐리티연구
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• 제1호
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• pp.135-173
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• 1997

We study on the power of local autonomous fire fighting in Korea. Chapter I which sets out purpose, scope and method, is followed by Chapter Ⅱ , dealing largely with the organization, man-power, equipment, activites of local fire fighting administration and the fire fighting environment. Chapter III made a comparative study on the power of autonomous fire fighting, local budget , fire fighting activities, fire present conditions. It is followed by concluding abservation made in Chapter Ⅳ and Chapter V. We indicated a few disputed points on the power of local autonomous fire fighting and suggested several alternatives to improve our fire fighting administration system. The alternatives suggested are as followes : (1) Reinforcement of the man-power, (2) Regulation of the standard fire fighting power, (3) Improvement of the using on fire fighting facilities tax and state finance, (4) Aplication of the local borrowings, (5) Tax reduction and exemption on the fire fighting equip-ment investment, and so forth.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2003년도 학술.기술논문발표회
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• pp.157-160
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• 2003

In order to reduce the construction cost and period without degrading the quality, construction companies are making a lot of efforts to prefabricate and mechanize the construction process, and introducing and utilizing various techniques of construction time management in the process of construction. However, due to the various factors (such as weather conditions, labor factors, supply of equipment and materials, safety accident, etc) in the process of construction, construction projects are not frequently completed within the scheduled Period. This research is to examine the current status of construction time management and factors causing delay in construction with regard to the concrete work (such as form work, steel reinforcement, and concrete work) in building apartments.

• 한국군사과학기술학회지
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• 제13권6호
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• pp.1026-1033
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• 2010

The analysis of water-entry impact forces acting on the fin shaft of high speed water-entry body is described. During the entry of high speed body into water, the physical phenomenon and flow properties are analyzed. A proper analysis model is established and the method to estimate the flow force which causes impact torque at the fin shaft is described. It is assumed that the fin shaft is damaged by the force which is induced by contacting with cavity wall. The pressure distribution of fin and the maximum torque are estimated and compared with breaking force. Conclusively, it is hard to resist water-entry impact force in terms of the reinforcement of fin shaft. Additionally safe equipment is essentially required.