• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.760-763
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• 1997

Using telesensor programming method, we control the space robot which has two 2-DOF manipulators. To make this control system, we devide total works by elemental operation. And we make a simulation system that can simulate sensors and robot. In the simulation system, we make a sensor data and robot paths by "Teaching by showing" method. And using these data, we control the real space robot. This off-line method can solve long time delay problem in teleoperation.operation.

• 방사성폐기물학회지
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• 제18권2호
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• pp.113-118
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• 2020

An options study was performed for the treatment of residual elemental sodium in driver plenums following the chopping operation during the pyroprocessing of used nuclear fuel. Given the pending availability of a multi-function furnace for distillation and consolidation operations in the Fuel Conditioning Facility, the furnace was considered for the processing of driver plenums. Although two options (oxidation and distillation) could be performed in the multi-function furnace, neither option has been developed sufficiently to date to warrant the use of the furnace for treatment operations. Thus, it was decided to defer the treatment of elemental sodium from driver plenums in the multi-function furnace until more developed technologies and/or furnaces become available. In the interim, storage of the plenums and characterization efforts are recommended.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 추계학술대회
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• pp.209-212
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• 2000

As a bench-scale study, transformation of nitrate to nitrogen gas under anoxic condition was determined by using autotrophic denitrifiers containing Thiobacillus denitrificans and elemental sulfur as an electron donor. The research objective is to measure the basic kinetic parameters of autotrophic denitrification reaction on the removal efficiency of nitrate. The results showed that nitrate was almost completely transformed to nitrite in the first 4 days of column operation. After 2 days of accumulation of nitrite, its concentration slowly decreased and the compound was detected less than 0.5 mg/L in 14 days. In the experiment, sulfate concentration in the effluent was the 70~90 mg-S/L and the pH was maintained around pH 7.5. When nitrate concentration of bank filtrate in the real field is considered, this sulfate concentration seems to be acceptable. At 17 cm from the bottom of the column, the effluent showed the highest nitrite concentration, and nitrate concentration decreased rapidly to the Point of 33 cm from the bottom. The results suggest that an appropriate thickness of permeable reactive barriers is about 30 cm.

• 한국환경과학회지
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• 제26권9호
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• pp.1013-1021
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• 2017

Exposure to Diesel Particulate Matter (DPM) potentially causes adverse health effects (e.g. respiratory symptoms, lung cancer). Due to a lack of data on Elemental Carbon (EC) exposure levels in underground copper ore mining (unlike other underground mining industries such as non-metallic and coal mining), this case study aims to provide individual miners' EC exposure levels, and information on their work practices including use of personal protective equipment. EC measurement was carried out during different work activities (i.e. drilling, driving a loader, plant fitting, plant operation, driving a Specialized Mining Vehicle (SMV)) as per NIOSH Method 5040. The copper miners were working 10 h/day and 5 days/week. This study found that the most significant exposures to EC were reported from driving a loader (range $0.02-0.42mg/m^3$). Even though there were control systems (i.e. water tanks and DPM filters) on the diesel vehicles, around 49.5% of the results were over the adjusted recommendable exposure limit ($0.078mg/m^3$). This was probably due to: (1) driver's frequently getting in and out of the diesel vehicles and opening the windows of the diesel vehicles, and (2) inappropriate maintenance of the diesel vehicles and the DPM control systems. The use of the P2 type respirator provided was less than 19.2%. However, there was no significant difference between the day shift results and the night shift results. In order to prevent or minimize exposure to EC in the copper ore mine, it is recommended that the miners are educated in the need to wear the appropriate respirator provided during their work shifts, and to maintain the diesel engine and emission control systems on a regular basis. Consideration should be given to a specific examination of the diesel vehicles' air-conditioning filters and the air ventilation system to control excessive airborne contaminants in the underground copper mine.

• 한국습지학회지
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• 제23권3호
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• pp.213-223
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• 2021

낙동강 하구 새섬매자기 식생지역의 수리역학적 퇴적환경을 알아보기 위하여 명지와 을숙도 조간대에서 6개의 퇴적물 코어를 채취하여 퇴적물 입도와 원소분석 (주원소, 미량원소, 희토류 원소)을 수행하였다. 명지 조간대의 퇴적환경은 낙동강 하구둑 좌측 수문의 영향 때문에 퇴적물 상부 (~ 15 cm)에서 분급도가 불량하고 왜도 및 첨도는 양의 값을 보였다. 반면에 을숙도 조간대는 주 수문뿐만 아니라 좌측 수문의 방류 영향으로 정점 별로 서로 다른 퇴적상을 보였다. 퇴적환경의 변화를 알아보기 위하여 분급도, 왜도 및 첨도 등을 이용하여 Linear Discriminate Function (LDF) 분석을 진행하였으며, 그 결과 퇴적물 상부에서 주로 에너지가 강한 퇴적환경이 나타났다. 을숙도 조간대의 ES05 (식생지역)와 ES11 (비 식생지역) 정점의 원소분포는 크게 Al, Fe 및 Ca 주요원소들의 분포와 관련하는 광물구성의 영향을 받는다. 알루미노실리케이트(Aluminosilicate)를 포함하는 쇄설성 광물들은 퇴적물의 희토류 함량을 희석시키며, 특히 ES05 정점 퇴적물의 원소조성을 결정하는 주요 요인으로 작용하였다. 반면에 ES11 정점의 원소조성은 점토광물과 철수산화물, 그리고 희토류 함량이 높은 중광물에 의해 조절되는 것으로 나타났다. 따라서 새섬매자기 조간대 퇴적물의 원소조성은 광물 분별 과정의 영향을 받으며, 이는 담수-해수 혼합 지역의 퇴적환경을 반영한다.

• 한국정보통신학회논문지
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• 제16권10호
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• pp.2280-2286
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• 2012

본 논문에서는 고속 컴퓨터 집적 영상 복원 방법을 이용하여 새로운 형태의 3D 비선형 상관기를 제안한다. 고속 컴퓨터 집적 영상 복원 방법을 구현하기 위해서 기존의 방법에서 확대 과정을 제거함으로서 고속 계산이 가능하다. 제안하는 상관기는 먼저 기준 물체와 목표 물체의 요소 영상들을 렌즈 배열을 통해 픽업한다. 이 픽업된 영상에 고속 컴퓨터 집적 영상 복원 방법을 사용하여 목표 평면 영상과 기준 평면 영상들이 복원된다. 복원된 기준 평면 영상과 목표 평면 영상들 간의 비선형 상호상관을 통해 인식을 수행한다. 비선형 상관 연산의 사용은 상관기의 3D 물체 인식 성능 향상시킬 수 있다. 제안된 방법의 유용함을 보이기 위해 기존의 방법과 비교하여 기초적인 상관관계 실험을 수행하고 그 결과를 보고한다.

• 한국정보통신학회논문지
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• 제17권4호
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• pp.981-988
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• 2013

본 논문에서는 집적 영상 기술을 이용하여 한 번의 획득 과정을 통하여 물체의 3차원 공간정보를 저장한 후 저장된 정보를 이용하여 집속면(focusing plane)에 대응하는 디포커싱 영상을 구현하는 방법을 제안한다. 집속면에 대응하는 ${\delta}$-함수 배열과 기본영상의 콘볼루션 연산을 통하여 집속면에 대응하는 포커싱 및 디포커싱영상을 구현하였다. 디포커싱 정도는 집속면과 물체거리의 차이에 따라 상대적으로 달라짐을 관찰 할 수 있었다. 제안하는 방법에 대한 기초적인 실험을 수행하고 그 결과를 보고한다.

• 한국통신학회논문지
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• 제40권4호
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• pp.769-779
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• 2015

본 논문에서는, 친환경 Green IT 기술과 융합된 식물공장 시스템의 이상적인 표준 설계 및 구축안을 요소기술별로 제시하였으며, 이의 실현 가능성과 문제점 분석을 위해 요소기술별 관련 하드웨어 및 소프트웨어를 종합한 콘테이너형 식물공장 테스트베드를 구축하여 운영하고, 운영상의 문제점을 파악하여 미래의 대형 식물공장 구축과 운영의 기반이 되는 시험연구를 수행하였다.

• 한국환경보건학회지
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• 제48권2호
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• pp.66-74
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• 2022

Background: The health effects of particulate matter (PM_2.5) bonded with various harmful chemicals differ based on their composition, so investigating and managing their concentrations and composition is vital for long-term management. As industrial complexes emit considerable quantities of pollutants, higher PM_2.5 concentrations and chemical component effects are expected than in other places. Objectives: We investigated the concentration distribution ratios of PM_2.5 chemical components to provide basic data to inform future major emissions control and PM_2.5 reduction measures in industrial complexes. Methods: We monitored five sites near the Ansan and Siheung industrial complexes from August 2020 to July 2021. Samples were collected and analyzed twice per week in spring/winter and once per week in summer/autumn according to the National Institute of Environmental Research in the Ministry of Environments' Air Pollution Monitoring Network Installation and Operation Guidelines. We investigated and compared composition ratios of 29 ions, carbon, and elemental components in PM_2.5. Results: The analysis of PM_2.5 components at the five sites revealed that ion components accounted for the greatest total mass at approximately 50% while carbon components and elemental components contributed 23~28% and 8~10%, respectively. Among the ionic components, NO₃^- occupies the greatest proportion. OC occupies the greatest proportion of the carbon components and sulphur occupies the greatest proportion of elemental components. Conclusions: This study investigated the concentration distribution ratios of PM_2.5 chemical components in industrial complexes. We believe these results provide basic chemical component concentration ratio data for establishing future air management policies and plans for the Ansan and Siheung industrial complexes.

• 한국재료학회지
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• 제25권8호
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• pp.386-390
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• 2015

Fe-base superalloy powders with $Y_2O_3$ dispersion were prepared by high energy ball milling, followed by spark plasma sintering for consolidation. High-purity elemental powders with different Fe powder sizes of 24 and 50 mm were used for the preparation of $Fe-20Cr-4.5Al-0.5Ti-O.5Y_2O_3$ powder mixtures (wt%). The milling process of the powders was carried out in a horizontal rotary ball mill using a stainless steel vial and balls. The milling times of 1 to 5 h by constant operation (350 rpm, ball-to-powder ratio of 30:1 in weight) or cycle operation (1300 rpm for 4 min and 900 rpm for 1 min, 15:1) were applied. Microstructural observation revealed that the crystalline size of Fe decreased with an increase in milling time by cyclic operation and was about 15 nm after 3 h, forming a FeCr alloy phase. The cyclic operation had an advantage over constant milling in that a smaller-agglomerated structure was obtained. The milled powders were sintered at $1100^{\circ}C$ for 30 min in vacuum. With an increase in milling time, the sintered specimen showed a more homogeneous microstructure. In addition, a homogenous distribution of Y-compound particles in the grain boundary was confirmed by EDX analysis.