• Clean Technology
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• v.12 no.3
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• pp.182-189
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• 2006

In this study, high speed machining is evaluated with regard to economical and environmental effects. Considering environmental loads, machining costs are analyzed with the mathematical models of machining economics and cutting fluid loss. Data from the tool life experiments of high speed milling and turning are used for the analysis. The analysis of high speed milling shows that the machining cost decreases as increasing the cutting speed. In turning process, the cooling method using cutting fluid shows the minimum machining cost. Considering both machining and environmental costs, cooling method using cold air is superior to other methods.

• JOURNAL OF ELECTRICAL WORLD
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• s.414
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• pp.90-93
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• 2011

세계 최대 시설용량이며, 국내최초인 조력발전소의 마무리공정이 한창 진행되고 있는 대역사의 현장을 지난 17일 오후 2시에 찾았다. 짭쪼름한 바닷내음이 점차 진해진다 싶을 때 시야에 들어온 '청정 무공해 전력생산기지' 시화조력발전소. 발전소는 경기도 안산시 오이도와 대부도 사이를 잇는 길이 11.2Km 시화방조제 중간(작은 가리섬)에 위치한 가운데 본격가동의 카운트다운을 준비하고 있다. 지난 4월 10호기를 시작으로 6개월간에 걸친 각종 설비기능시험 등을 거쳐 오는 11월 상업운전을 통해 본격적인 전기 생산에 돌입할 예정인 시화조력발전소의 건설 의미와 주요시설 및 설비구성, 그리고 준공에 따른 기대효과 등을 조망해 본다.

• Monthly Duck's Village
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• s.80
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• pp.42-43
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• 2010

본지에서는 지역별로 달라지는 2010년 축산관련정책을 소개하고자 한다. 눈 여겨 볼 것은 충북도는 올해 축 수산업에 840억을 투자하여 축산부분 97개 사업에 840억원을 편성하는 등 전년대비 12.7% 증가하였으며, 오리축사환기시설 보급시도비 10%와 시군비 40%를 지원하는 사업을 신설하여 환기시설 설치를 통한 연료비 절감 및 질병예방 효과를 거두고자 하였다. 이를 통해 도민과 함께하는 지속가능한 축산업 구현을 목표로 생산부터 소비단계까지 총체적 비용 절감을 이루어 내고, 안전한 축산물 생산으로 소비자에 신뢰를 제고하는 한편, 7년 연속 AI 없는 청정 충북을 달성할 계획이라고 밝혔다.

• Clean Technology
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• v.27 no.4
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• pp.325-331
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• 2021

In this study, bio-carbons were produced by activation process from unused biomass (Grade 3 wood pellet and spent coffee grounds) to determine the removal performance of formaldehyde and acetaldehyde. The activation experiments were conducted in a fixed bed reactor using CO₂ as an activation agent. The temperature of the activation reactor and input of CO₂ were 900 ℃ and 1 L min^-1 for all the experiments. The maximum BET surface area of about 788 m² g^-1 was obtained for bio-carbon produced from Grade 1 wood pellet, whereas about 544 m² g^-1 was achieved with bio-carbon produced from spent coffee grounds. In all the experiments, the bio-carbons produced were mainly found to have micro-porous nature. A lower ash amount in raw material was favored for the high surface area of bio-carbons. In the removal test of formaldehyde and acetaldehyde, the bio-carbon produced from spent coffee grounds showed excellent adsorption performance compared with woody biomass (Grade 1 wood pellet and Grade 3 wood pellet). In addition, the comparative experiment of commercial impregnated activated carbon and bio-carbon produced from spent coffee grounds was conducted. In terms of formaldehyde removal performance, the commercial impregnated bio-carbon was excellent, while bio-carbon produced from spent coffee grounds was excellent in acetaldehyde removal.

• Clean Technology
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• v.17 no.3
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• pp.215-224
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• 2011

It is an important issue to develop quality assessing system for biofuel for the purpose of accelerating the mass production of biofuel. It is particularly challenging to conduct testing method in the mass production of bioethanol while meeting quality specifications such as ASTM (American Society for Testing & Materials) D4806-10. In order to address this challenge, this paper proposes on-line spectroscopic quality assesment system based on Near Infrared spectrum and Partial Least Squares method in Chemometrics. As a result of testing a number of preprocessing methods and Partial Least Squares, it was found out that Savitzky-Golay method showed the best performance in terms of spectrum correction, noise reduction, and model maintenance. The proposed system allows us to assess multiple quality components continuously using spectroscopic facilities with the cheap cost. Since the value of R2 is more than 0.99, it is possible to replace the laboratory analysis.

• Clean Technology
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• v.29 no.3
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• pp.163-171
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• 2023

Hydrogen has been gaining a lot of attention as a possible clean energy source that can aid in reaching carbon neutrality. Currently, hydrogen production has relied on the steam reforming of fossil fuels. However, due to the carbon dioxide emissions caused by this process, hydrogen production based on the steam reforming of bio-oil derived from biomass has been proposed as an alternative approach. In order to use this alternative approach efficiently, one of the key issues that must be overcome is that the complexity of bio-oil, which has a large molecular weight and diverse functional groups of hydrocarbons, promotes the catalytic deactivation of nickel-based catalysts. In this review, research efforts to improve nickel-based catalysts for the steam reforming of bio-oil have been discussed in terms of the active phase, support, and promoters. The active phases are involved in activating C-C and C-H bonds of high-molecular-weight hydrocarbons, and noble and transition metals can be utilized. In terms of the support and promoters, the catalytic deactivation of Ni-based catalysts can be inhibited by utilizing reactive lattice oxygen for support or by suppressing the acidity. The development of active and stable Ni-based reforming catalysts plays a critical role in clean hydrogen production based on bio-oils.

• The Hankook-Saengyark Bo
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• no.248
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• pp.2-2
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• 2001

한약 제조 유통관리 대폭 강화(북지부, GAP제도 도입방침 최근 밝혀) - 사용불가 한약재 사용 건강원 적발 - 농지자금 금리인하방침 현행 5$\~$6.5$\%$서 3$\%$선으로 - 자연공원내 주민 임산물채취 허용 - 생명연, 상해의약공업연과 협력각서(중풍 심장병등 성인병 관련 신약개발)

• The Korea Swine Journal
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• v.10 no.4 s.104
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• pp.41-45
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• 1988

국제화시대의 흐름을 타고 침입한 오제스키병은 불현성 감염이기에 박멸이 힘들다. 따라서 종돈의 유통과 생산관리 시스템으로서 올인-올아웃(All in-All out)방식에 의한 환경개선이 중요하고, 오제스키병 대책에만 머물지 말고 SPF방식, 인공포육 또는 MEW(투약-조기이유방식)등 실정에 맞는 청정화 방식을 택하는 일이 급선무이다.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2009.10a
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• pp.371-372
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• 2009

• Environmental engineer
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• v.18 s.196
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• pp.14-18
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• 2002

전국의 많은 환경관리인들은 주어진 책무를 다하기 위해 오늘도 많은 수고를 아끼지 않고 있다. 그러나 대부분의 경우 환경기술인들은 열악한 여건하에서 일을 해야 하기 때문에 많은 고생을 하고 있는 것이 현실이다. 최고경영자의 관심부족, 인적물적자원의 부족, 관계자들의 이해부족 등의 여건 속에서 일을 해야 되는 것은 물론 환경전문가로서 더욱 발전하여야 함에도 불구하고 공부할 수 있는 여건 등이 미비하여 훌륭한 환경전문가로서의 성장과 위상의 제고보다는 환경현장