• 한국축산시설환경학회지
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• 제4권1호
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• pp.21-28
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• 1998

This study was carried out to estimate the economic impacts on operation cost and curtail the bulking agent between two kinds of plants in swine farms. Bulking agents and Plants have a variety of roles in the fields of the composting for livestock manure and also represent an economic problem in terms of plant operation costs and compost production. Two farms which have rotary(size of reactor : 10${\times}$35${\times}$1.5m) or bucket(size of reactor : 10${\times}$68${\times}$2m) plants were used for 24 weeks for bucket conveyor system, which are composed of refilling rice hull as a bulking agent every 3 weeks till decreasing volume, for 4 weeks for rotary conveyor system, which has continuous compost production system without refilling rice hull, respectively. Composts was produced in 24 weeks in the bucket conveyor system, in 4 weeks in the rotary conveyor system, respectively. The results are as follows : 1. The tissue change of Rice hull at the composts of 45 days pursuant to composting steps was more crumbling in bucket conveyor system than in rotary conveyor system. 2. Microbial counts of the final composts for safety and quality showed that total bacteria counts was 1.01${\times}$108 cfu/g in bucket conveyor system, 2.82${\times}$108 cfu/g in rotary conveyor system, Salmonella was 0.3${\times}$102 cfu/g in bucket conveyor system, 7.6${\times}$102 cfu/g in rotary conveyor system, colifom bacteria was 0.5${\times}$106 cfu/g in bucket conveyor system, 1.5${\times}$106cfu/g in rotary conveyor system, fungi 1.24${\times}$106 cfu/g in bucket conveyor system, 0.01${\times}$106 cfu/g in rotary conveyor system, respectively. However, Any system used in this trial could not be met the regulation of A grade compost of EPA and USA. 3. C:N ratio according to the composting was more rapidly changed in bucket conveyor system with 64.5 of 5 days compost to 25.4 of final products than in rotary conveyor system with 26.7 of 5 days compost to 25.9 of final products. 4. Based on the mechanical characteristics of plants used in trial and compared with Rotary conveyor system, the Bucket conveyor system in which has 0.72 ㎥/㎥ of bulking agent capacity per slurry could be curtailed 1.78 ㎥of rice hull for disposal of waste, 1㎥. It was proper facilities to produce composts quantitative in Rotary conveyor system, and to treat waste quantitative and obtain good results in compost quality in Bucket conveyor system.

• 한국터널지하공간학회 논문집
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• 제16권2호
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• pp.203-211
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• 2014

본 논문은 shield TBM의 버럭 배토장비인 screw conveyor의 최적 버럭 배토효율에 관한 연구이다. screw conveyor의 배토효율에 영향을 미치는 주요 Parameter인 screw 형태(Shaft식, Ribbon식), screw conveyor와 screw 각도의 영향을 분석하기 위하여 축소모형시험을 실시하였다. 축소모형시험을 통해 구한 버럭 배토 효율과 기존 이론식을 통해 구한 최적의 버럭 배토효율을 비교 분석하여 최적의 screw 형태, screw conveyor와 screw각도를 도출 할 수 있었다. 결론적으로 축소모형시험을 통하여 screw conveyor 설계인자들에 대하여 제시하였다. 또한 이 연구 결과는 향후 shield TBM 기술을 발전시키는데 유용할 것으로 기대된다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.1037-1040
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• 1998

In this paper, current conveyor building block is introduced and CMOS realization of this block is given. The input-impedance characteristics, current-transfer characteristics and voltage-transfer characteristics of this proposed current conveyor circuit are given. This characteristics of the CMOS current conveyor circuit is useful of the various applications which require a wideband. Using the Spice tool, the circuit is designed and the characteristics of CMOS current conveyor circuit is considered. Finally, refer to the simple applications.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2002년도 춘계학술대회논문집
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• pp.145-149
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• 2002

92∼3년 A 라인에서 처음으로 Bay 내에 Conveyor (Intra) 사용한 Stocker to Equipment에서 Material(Lot) Moving을 위한 Project를 실시하였으나 예상과는 달리 Conveyor Capability가 부족하여 장비에서 Rundown 현상이 발생하였다. 정상적인 Simulation없이 Design한 Conveyor System은 막대한 금전투자, 인력투자, 설치Testing 철거 등으로 인한 라인 작업방해 등 막대한 손실을 남기는 실패를 가져왔다. 본 연구에서는 이미 장비가 Setup되어 Running중에 있는 반도체 라인 환경 또는 신규로 새로운 라인을 Design할 때 사람을 대신하여 Bay내에서 Lot을 Stocker에서 장비 또는 장비에서 장비로 이동을 Conveyer를 사용할 경우 적정 Conveyor Capability를 산정 하는데 그 목적이 있다.

• 조명전기설비학회논문지
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• 제26권10호
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• pp.72-80
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• 2012

In general, electronic conveyor scales are installed in a relatively distributed manner on the crushed rock and sand production site. It is one of the time-consuming and difficult engineering works to monitor and control the plant operation status such as the management of measuring data, malfunction of belt conveyor, and fault of electronic conveyor scale. Therefore, to alleviate the inefficient problems and to monitor the operating plant in the online and remote control room, a remote calibration and real-time monitoring system, which is practically applied to the electronic conveyor scale system and verified by onsite experiment, is developed based on the LabVIEW.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.436-436
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• 2000

In order to monitor the belt from being damaged by impact of large lump of materials in ores being transported on conveyor belt, we developed a conveyor belt monitoring system using vision. By the information such as the position and size of the damage of belt obtained by vision system, it is expected that not only the span of belt life will be lengthened, but also this system can enable operators to plan scheduled maintenance and prevent the enlargement of damaged parts in conveyor belt at an early stage

• 한국안전학회지
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• 제34권5호
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• pp.153-158
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• 2019

It is estimated that about 2,515 persons have been injured by conveyor for the past five years(2013 ~ 2017). Conveyors used in various industrial sites for transporting iron ore, coal, courier goods, etc., have various incidents such as a worker putting on or pulling a part of the body or work clothes on the driving part during maintenance. It is necessary for preventing similar accidents to conduct various researches. In order to propose the basis for revising laws and standards for the safety standards of the full cord switch to prevent conveyor accidents, this study compares Korea's Industrial Safety and Health Law (KISHL) with those of IEC, EN, Canada, and Australia. In addition, surveys of conveyor use plant and full cord switch domestic and foreign manufacturers was conducted. In this study, domestic and overseas related laws and technical standards compare and analyze to prevent conveyor accidents. In addition, we propose extension of safety certification for full code switch, establishment of safety inspection standard, and improvement of working method regulation through actual working condition investigation. It can be used as a basis for revising the occupational safety and health regulation and related notices, and thus contributing to enhancing the safe atmosphere of the conveyor business and improving the safety consciousness of the concerned persons.

• 한국시뮬레이션학회논문지
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• 제11권3호
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• pp.59-65
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• 2002

Semiconductor wafer fabrication is a business of high capital investment and fast changing nature. To be competitive, the production in a fab needs to be effectively planned and scheduled starting from the ramping up phase, so that the business goals such as on-time delivery, high output volume and effective use of capital intensive equipment can be achieved. Project executed that use conveyor in bay semiconductor A line. But conveyor capability is lacking and rundown happened in equipment. Do design without normal simulation and conveyor system failed. The comparison is peformed through simulation using .AutoMod a window 98 based discrete system simulation software, as a tool for comparing performance of proposed layouts. In this research estimate optimum conveyor capability, there is the purpose.

• 한국시뮬레이션학회논문지
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• 제24권3호
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• pp.97-105
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• 2015

본 논문은 시뮬레이션을 기반으로 자체 구동 롤러 컨베이어 물류시스템의 전력 효율을 분석하는 연구이다. 물류 시스템의 전력 효율 향상은 온실 가스 배출과 물류 비용을 감소시키는 이점을 가져온다. 자체 구동 롤러 컨베이어는 제품이 접근할 때에만 구동이 된다. 따라서 자체 구동 롤러 컨베이어 기반 시스템은 연속 구동 롤러 컨베이어 시스템에 비해 더 적은 전력을 소비한다. 본 논문에서는 DEVS(이산 사건 기반 시스템) 기반의 시뮬레이션 시스템을 설계하고 자체 구동 롤러와 연속 구동 롤러컨베이어 모델을 구축하였다. 설계된 시뮬레이션시스템과 컨베이어 모델의 검증과 확인을 위해 우리는 실험 환경에 대응하는 물류 모델을 모델링하고 모델과 실제 시스템간의 비교를 하였다. 본 연구의 주된 목적은 시뮬레이션 방법을 사용하여 자체구동 롤러 컨베이어 기반 물류 시스템의 전력 소비의 이점을 설명하는 것이다.

• Journal of Electrical Engineering and Technology
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• 제8권6호
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• pp.1571-1578
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• 2013

With the emergence of high-integration array and large area panel process, the need to minimize the generation of particles in the field of semiconductor, LCD and OLED has grown. As an alternative to the conventional roller system, a contactless magnetic conveyor has been proposed to reduce the generation of particles. An EM-PM hybrid which is one of magnetic levitation types is already proposed for the conveyor system. One of problems pointed out with this approach is the vibration caused by the dynamic interaction between conveyor and rail. To reduce the vibration, the introduction of a secondary suspension system which aims to decouple the levitation electromagnet from the main body is proposed. The objective of this study is to develop a dynamic model for the magnetically levitated conveyor, and to investigate the effect of the introduced suspension system. An integrated model of levitation system and rail based on 3D multibody dynamic model is proposed. With the proposed model, the dynamic characteristics of maglev conveyor system are analyzed, and the effect of the secondary suspension and the stiffness and damping are investigated.