• 대한환경공학회지
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• 제39권6호
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• pp.318-324
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• 2017

본 연구에서는 생물활성탄 공정에서 geosmin과 MIB의 제거시 생물분해와 흡착기작의 역할을 BAC와 biofilter를 이용하여 평가하였다. 정상상태에 도달한 BAC 공정에서 부착 박테리아들의 활성이 저하된 저수온기($9^{\circ}C$)에도 EBCT 30분의 조건에서는 geosmin과 MIB가 완전 제거되었다. 유입수의 수온이 $26^{\circ}C$일 때가 $9^{\circ}C$일 때보다 상층부분에서 부착 박테리아의 생체량과 활성도가 높았고, 여층의 하부로 갈수록 부착 박테리아의 생체량과 활성도의 감소율이 높게 나타났다. 이는 수온이 높을 때 상층부분에서 BOM 제거율이 높아 하층에 공급할 수 있는 BOM 양이 감소하기 때문이다. 부착 박테리아의 활성이 억제된 BAC 공정의 geosmin과 MIB의 제거율은 활성화된 BAC 공정에서의 제거율과 비교하여 큰 차이를 나타내지 않아 BAC 공정에서 geosmin과 MIB의 제거에 흡착기작의 기여도가 높게 나타났다. BAC 공정에서 geosmin과 MIB의 제거시 부착 박테리아에 의한 생물분해 기작과 활성탄 표면이 가지는 흡착 기작이 경쟁적으로 작용하였다.

• 산업경영시스템학회지
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• 제38권4호
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• pp.149-158
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• 2015

Up-to-date manufacturing companies have faced a market-driven environment of pull production order. There should be a difference in operating manufacturing resources according to the type, quantity, and delivery time of manufactured products, because the process situation in pull production is changed by customer orders. And it should be taken into account from the stage of preparing for production such as process design and the placement and utilization of manufacturing resources. However, the feasibility of production plans is limited because most of small manufacturing businesses make production/supply plan of the parts and products assuming that equipment abilities in scheduling is sufficient without managing process standard information systemically. In this study, a discrete event simulation system based on BOM (bill of material), that is F-OPIS (online productivity innovation system), is introduced and a case study on application of the system leading to improving productivities is presented. F-OPIS deals with a decision-problem on production management and it is specialized for small-and- medium sized manufacturing companies. The target company of this case study is a typical small-and-medium sized manufacturing company in Korea, that produces various machined parts. The target company adopts make-to-stock production management to prevent tardy delivery because of fluctuations in demand. Therefore, it is required to apply an efficient inventory control solution for improving productivities. In this paper, based on the constraints of working capacity of manufacturing resources, the bottleneck process is analyzed as production conditions are changed. Consequently, an improvement plan is proposed, that eventually enhances overall utilization rates of resources in the bottleneck process and reduces overall production lead-time and inventory level.

• 산업경영시스템학회지
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• 제31권1호
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• pp.92-100
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• 2008

This paper develops a process monitoring system for real-time process control. The practical case is studied on a small and medium marine equipment company. For business process reengineering of the company, we adopt an approach based on information engineering methodology, which consists of four stages : planning, analysis, design, and implementation. The system is developed for Client/Server environment. We discuss the constructing of hardware system for real-time process control at low cost. The developed system is composed of interrelated modules for item master and BOM management, process control, facility management, SQC and work report.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.1870-1873
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• 2004

The objective of this study is to investigate the possibility of chemical process synthesis purely based on mathematical programming when given an objective, feed conditions, product specifications, and model equations for available process units. A method based on a state space approach is proposed, and applied to an example problem with a reactor, a heat exchanger, and a separator. The results indicate that a computer can automatically synthesize an optimal process without any heuristics or expertise in process design provided that global optimization techniques are improved to be suitable for large problems.

• 한국콘텐츠학회논문지
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• 제20권6호
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• pp.415-424
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• 2020

건물에 승강기를 설치하는데 있어서, 중소 승강기 제조회사에서는 건축 도면과 대상 승객의 요구사항을 분석하여 레이아웃 도면 작성 후 고객의 1차 승인을 거쳐 현장 실측을 통한 최종 도면 확정까지의 단계에서 시간이 장시간 소요되고, 고객과의 의사소통에 오류가 발생하는 등 고객의 요구사항을 기술적 사양으로 변환하는데 어려움을 겪고 있다. 또한 확정된 설계 사양을 제조 정보로 변환하여 신속한 제조를 가능케 함으로써 납기 준수율을 높이는 데에도 한계를 나타내고 있다. 본 연구에서는 중소 승강기 제조회사에서의 영업과 설계 업무를 분석하고 효율적 개선이 가능한 영역을 검토하여 영업 및 설계 비즈니스 프로세스의 업무 개선을 위한 중소기업형 승강기 영업-설계 통합 프레임워크를 제안하고, 이의 실행 방안을 제시하였다.

• 대한조선학회논문집
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• 제48권3호
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• pp.207-214
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• 2011

Ship design requirements described in the building specification should be reflected in the design process. This paper identifies the configuration of requirements mentioned in the building specification using Ontology Representation Language (OWL). Ontology-based semantic search system specifies the requirement items. Through this extraction, building specifications mentioned for each entry are configured to the tree. Tracking requirements for ship design and a set of procedures to instruct is also used for the V model of systems engineering. The semantic search engine of robot agent and ontology can search the requirements specification document and extract the design information. Thereafter, design requirements for the tracking model that proposes the relationship between the associated BOM(bill of material) and product structure.

• 반도체디스플레이기술학회지
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• 제17권3호
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• pp.10-16
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• 2018

In silicon crystalline PV (Photo Voltaic) industry, PV module or panel electric power is directly related to the companies' profit. Thus, many PV companies have invested and focused on R&D activities to get the higher module power. The main BOM (Bills of Material) on the module consists of PV solar cell, ribbon, EVA (Ethylene-Vinyl Acetate copolymer), glass and back sheet. Based on consistent research efforts on enhancing module power using BOM, there have been increase of around 5 watt per module every year as results. However, there are lack of studies related to enhancing accuracy of measurement. In this study, the enhancing on the metrology is investigated and the improvement shows actually contribution to company's profit. Especially, the measurement issues related to heat and to quasi state of bandgap diagram by EL(Electro Luminescence) are described in this study.

• 경영과학
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• 제18권2호
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• pp.1-10
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• 2001

Due to environmental change in market, delivery satisfaction to customer end redaction of LeadTime are critical In the Make-to-Order manufacturing system. This paper focuses on Order Feasibility Decision System Based on SNS System. We suggest BOP (Bill of Process) in which aggregated information is used When the load p1anning problem is solved while more detailed information is used when the scheduling problem is solved.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.170.5-170
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• 2001

As close competitions are being fought out among enterprises, they should accomplish their objectives such as reduction of cost, improvement of quality and condensation of due date, etc. For this objects, it becomes very important to manage the workflow harmoniously and to share the information efficiently between geographically dispersed users. We developed the collaborative design system, which manages various design process and enables to share design information. In this paper, Internal-based collaboration system for press die design process in the automobile manufacturer is developed with CORBA, Java and relational database system. After modeling real press die design process with UML language, workflow routing path is created by modeling data. Cost and time for ...

• 산업경영시스템학회지
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• 제43권2호
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• pp.72-78
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• 2020

Demand for cosmetics with functionality and eco-friendliness has increased dramatically due to recent aging, well-being trends, and increased interest in beauty. Cosmetics production in 2014 was 8,970.4 billion won, an increase of about 50% compared to 6,014.6 billion won in 2010. In the midst of this, similar companies in intense competition are pursuing differentiated strategies and innovation activities to solve quality, price and delivery problems. In particular, cosmetics packaging work is getting more difficult due to the increasing bill of materials (BOM) and difficult assembly methods. Therefore, in this study, the following problems were identified and suggestions for the improvement of the packaging Many research laboratories such as biotechnology, chemistry, and pharmaceuticals, which are undergoing various studies, are equipped with ready-made laboratory safety equipments such as bio-safety workbenches, aseptic bases, and exhaust workbenches. However, most researchers are disadvantaged in using existing safety equipment. This is because existing safety equipment can not take into account all of the unique characteristics of the research. For this reason, researchers are demanding the development of customized safety equipment that is well suited to their research needs. process of Company C, which is facing difficult situation to respond to the customer 's delivery due to the 52 - hour work week. First, we used the stopwatch to find the difficulty process in the packaging process and show ways to improve it. Second, to improve the efficiency of line balancing in the packaging process, we integrate processes, improve work methods, and perform simple automation. As a result, the prepare loss for replacement was reduced by 1 minute from 5 minutes, resulting in a 23% increase in productivity from 112 ea./hour to 137ea./ hour per person. At this time, the LOB of the packaging process was improved from 70% to 82% by operating one more production line through one person per line, total 9 people saving.