• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.467-470
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• 2006

The earth volume which is the basis of all the construction has gone through great development so far with the use of construction machine; however, systematic studies on the related area is in need since the appropriate compound engineering method of earth volume equipments which is a key factor for shortening the project duration and cost reduction is not systematically established and it is dependent on experience. Reasonable mechanical earth volume should take into consideration of performance and characteristics of the equipment, the kind of project, scale and conditions in advance. Also, the optimum compound engineering should be planned by selecting several available scales of equipment. In this study, the earth volume estimate model is established for optimum compound engineering of earth volume equipment for mechanized earth volume equipment loading and moving stage among many stages of earth volume task using system dynamics technique. The optimum compound engineering model of the earth volume equipment produced as a result of this is expected to make reasonable decisions in the shortest time in selecting earth volume facility.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2010.05a
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• pp.201-205
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• 2010

Earthwork is an essential initial work discipline in construction projects and open to significant impacts of several factors such as weather, site conditions, soil conditions, underground installations and available construction machinery, calling for careful planning by managers. However, selection and combination of construction machinery and equipment for earthwork still depends on experience or intuition of managers in construction sites, with much room left for proper management in terms of cost, schedule and environmental load control. This research aims to analyze the performance of earthwork equipment and establish relations among various factors affecting a model for optimizing selection and combination of earthwork equipment as a precursor to the development of such model. We expect the conclusions herein to contribute to optimizing selection and combination of earthwork equipment and provide basic inputs for the development of applicable model that can save costs, reduce schedule and mitigate environmental load.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 1996.05a
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• pp.219-226
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• 1996

일반적으로 밀폐 형단조공정에서 약 10,000톤의 성형력이 필요한 직경이 540mm인 플랜지 형태의 알루미늄 7175 합금 단조품을 2,500톤 프레스에서 단조하기 위한 공정연구를 하였다. 장비의 성형력 부족을 극복하기 위하여 업셋단조와 기계가공 및 전방압출을 조합한 복합성형공정을 제안하였으며, 복합공정은 실제재료를 이용한 $\frac{1}{4}$ 축소 모델 실험과 유한 요소 해석으로 그 타당성이 판단되었고, 선정된 프레스에서 실물 크기의 플랜지 단조 가능성을 확인하였다.

• The Journal of the Acoustical Society of Korea
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• v.33 no.2
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• pp.111-117
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• 2014

In this paper, the structure-borne noise reduction on electrical equipment is discussed by the experimental analysis. The water cooling system in electrical equipment is the only noise source, so the mock-up was made to measure noise characteristics. Effects of power supply, stiffness, isolation of noise source and natural frequency determined by resilient mounts are investigated using the mock-up. The console prototype was made referring to noise reduction technique by the mock-up. The structure-borne noise level of a console prototype was measured and some experiments to reduce the noise was undertaken. The $1^{st}$ and $4^{th}$ harmonics of operating frequency of cooling fans causes highest structure-borne noise levels. The control of operating speeds of several DC cooling fan groups was tried. Also types and installation layouts of resilient mounts were investigated. To reduce structure-borne noise, followings can be applied: increase of stiffness, isolation of source, decrease of natural frequency of mount, combination of operating speed of fans, selection of mounts, and so on.

• Korean Journal of Construction Engineering and Management
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• v.15 no.6
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• pp.26-34
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• 2014

Highway construction is a combination of linear, repetitive, and highly equipment intensive operations. Various types of construction equipment are deployed to ensure undisrupted performance of construction, and thus productivity improvement and cost-saving can be achieved through well-thought-out planning. The selection of construction equipment is dependent upon construction sequence, site conditions, and construction methods. In the process of planning, management should consider various types of construction methods per each type of construction operation. Also, management should map out proper construction equipment operation plan that takes the construction duration and cost measures into consideration. However, limited availability of historic data from the similar types of operations has been a stumbling block to proper construction planning, making the operations performed based upon experience and intuition guided by rules-of-thumb. As a consequence, the planing phase rarely provided an adequate validity in the implementation phase. The researchers developed a process logic for each construction type that management can utilize from early phase of highway construction planning process. Moreover, derived the construction equipment combination optimized for efficiency by using the process simulation technique. The developed method is expected to be useful for the decision-making process that aims to evaluate efficiency of various process plans and to ensure optimal selection of construction equipment for highway construction projects.

• Proceedings of the Korea Society for Simulation Conference
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• 2001.05a
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• pp.49-53
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• 2001

지금까지 컨테이너터미널을 계획하면서 시뮬레이션을 이용하여 소요자원의 규모나 생산성 등을 분석하려는 연구는 많이 진행되어왔다. 그렇지만 컨테이너터미널의 구성 요소에 대한 전제 조건이 부족한 경우에 도입 가능한 다양한 컨테이너 취급 시스템과 그에 관련된 배치안 및 운영 알고리즘의 조합으로 구성되는 모든 대안들을 시뮬레이션하여 비교 평가하기 위해서는 많은 비용과 시간이 필요하다. 따라서 본 연구의 목적은 상세 분석이 필요한 대상을 선정하기 위해 개발 조건을 고려한 컨테이너터미널의 적정 처리능력, 대안별 시설 규모 및 위치 그리고 하역 장비의 종류 및 운영대수 등을 대략적으로 계획하고 시뮬레이션 분석과 운영정보가 이에 체계적으로 연결되어 효율적인 의사결정을 할 수 있게 정보와 흐름을 통합 관리하는 시스템을 설계하는 것이다. 통합관리시스템은 수행 역할에 따라 프로젝트 관리, 운영정보 관리, 능력계획, 배치계획 그리고 시뮬레이션의 모듈들로 구성된다. 본 논문에서는 각 구성모듈의 기능과 모듈간의 입출력 정보를 정의하였고 시뮬레이션에서 필요한 주요 객체 및 제어 흐름을 설계하기 위해 개체지향방법론의 표준인 UML을 이용하였다.

• 주택과사람들
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• no.3 s.20
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• pp.33-36
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• 1992

[ ${\circ}$ ] 건설부는 성수기의 골재 부족 현상과 비수기의 골재생산업체의 경영난을 해소하기 위하여 골재비축계획을 마련하였음. -골재수요는 건설경기의 계절성으로 인하여 변동폭이 큰 반면 골재공급은 주문생산성 및 비탄력성으로 매년 성수기에 골재 부족현상이 나타나고 있으며 -골재생산업체는 비수기의 골재수요 감소로 조업의 중단 또는 단축이 불가피하여 유휴장비${\cdot}$인력의 발생으로 경영의 비효율성 초래 -따라서 비수기의 골재를 비축하므로서 ${\cdot}$ 골재수요를 창출하여 골재생산업체의 유휴장비와 인력의 활용이 가능하게 하여 경영의 어려움을 해결하고 ${\cdot}$ 비축골재를 성수기에 방출하여 골재부족현상에서 오는 골재가격의 상승과 부실공사를 방지하고자 함. ${\circ}$ 골재 비축 계획의 주요내용을 보면 -골재 비축자금 : 국민주택기금 100억원(연리 $10{\%}$ -비축자금 대여대상 : 1) 신도시 건설에 참여한 주택건설등록업자 중 현장에 배처플랜트 설치업체 2) 수도권 소재 KS 레미콘 생산업체 3) (주)한국골재산업 -자금대출공고 : ''91. 11. 25${\~}$''91. 11. 30(주택은행) -대상업체 선정 : ''91. 12. 1${\~}$''91. 12. 5(한국주택사업협회, 레미콘 공업협회 및 조합, (주) 한국골재산업이 상호 협의하여 결정) ${\circ}$ 예상 비축량은 매사 1,000천${m^{3}$로 동일조건 일괄공동계약 방식에 의해 12월${\~}$2월에 구매하여 5월${\~}$6월과 10${\~}$11월 성수기에 방출할 예정임.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• autumn
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• pp.387-392
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• 2001

The purpose of this study is to develop the process to support and evaluate experts' decision making on vertical transportation planning in high-rise building constructions. Experts generally carry out the vertical transportation planning by heuristic methods, so there is a possibility that their decisions failed. The failure of the vertical transportation planning can be result in much loss of time and cost. The process presented in this paper evaluates experts' alternatives, organizes the results of the vertical transportation plan, and then leads to the systematic flow of materials and crews.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.15 no.6
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• pp.463-470
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• 2022

Intravenous injection is widely used for patient treatment, including injection drugs, fluids, parenteral nutrition, and blood products, and is the most frequently performed invasive treatment for inpatients, including blood collection, peripheral catheter insertion, and other IV therapy, and more than 1 billion cases per year. Intravenous injection is one of the difficult procedures performed only by experienced nurses who have been trained in intravenous injection, and failure can lead to thrombosis and hematoma or nerve damage to the vein. Nurses who frequently perform intravenous injections may also make mistakes because it is not easy to detect veins due to factors such as obesity, skin color, and age. Accordingly, studies on auxiliary equipment capable of visualizing the venous structure of the back of the hand or arm have been published to reduce mistakes during intravenous injection. This paper is about the development of venous detection equipment that visualizes venous structure during intravenous injection, and the optimal combination was selected by comparing the brightness of acquired images according to the combination of near-infrared (NIR) LED and Filter with different wavelength bands. In addition, an image processing algorithm was derived to threshehold and making blood vessel part to green through grayscale conversion, histogram equilzation, and sharpening filters for clarity of vein images obtained through the implemented venous detection experimental module.

• Journal of Korean Society for Geospatial Information Science
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• v.5 no.2 s.10
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• pp.169-177
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• 1997

The purpose of this paper is to study the ideal Auto-surveying system and to establish the standard of work procedure involved with completing a precise three-dimensional topographic survey with RTK GPS equipment, a pen based personal computer, and real time CADD software. The fieldwork was done at a golf course which could be regarded as a heavy civil project site such as the reclamation and the site preparation work in December of 1997. The proposed Auto-surveying system and the work procedure in this paper is based on the data processing and the resultant topographic map of the golf course.