• Title, Summary, Keyword: Expected efficiency

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Deinking of White Ledger with Ultrasonic Wave : Laboratory Scale Trial

  • Won, Jong Myoung
    • Journal of Forest and Environmental Science
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    • v.23 no.2
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    • pp.73-78
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    • 2007
  • Ultrasonic deinkings of white ledger were carried out to confirm whether the ink removal efficiency and pulp qualities can be improved by the ultrasonic deinking. The effects of conventional pulping and ultrasonic treatment of white ledger on the ink particle size distribution and ink removal coefficient were compared. The physical properties of paper, energy consumption and effluent qualities were measured. The ultrasonic treatment of white ledger resulted in the ink particle size distribution suitable for flotation. The ink removal efficiency, brightness, breaking length and effluent quality were improved by the ultrasonic deinking. It is expected that the competitiveness of ultrasonic deinking system can be improved by the optimization of treatment condition.

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Warehouse Picking Efficiency influence Analysis of Product location by Delivery Frequency (출고빈도별 제품 로케이션 배치에 따른 피킹효율 영향 분석)

  • Yim, Woo-Taek;Park, Hyun-Ho;Kang, Kyung-Sik
    • Journal of the Korea Safety Management and Science
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    • v.16 no.3
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    • pp.363-368
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    • 2014
  • During the fierce competition among the companies, improvement of logistics center managing efficiency is importantly recognized. Among them, studies on improvement of picking work process on about 55% of logistics center managing costs are continuously conducted. And, most of studies focus on analysis on strengths and weaknesses of picking method performable on the stage of logistics center design, etc, so the purposes of this research are to define load location rule by product releasing frequency in logistics managing environment based on conveyer and suggest expected effects by simulation analyzing method to improve picking managing efficiency.

Photovoltaic Properties of Tandem Structure Consisting of Quantum Dot Solar cell and Small Molecule Organic Solar cell

  • Jang, Jinwoong;Choi, Geunpyo;Yim, Sanggyu
    • Proceedings of the Korean Vacuum Society Conference
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    • pp.249.2-249.2
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    • 2015
  • Connecting two or more sub-cells is a simple and effective way of improving power conversion efficiency (PCE) of solar cells, and the theoretical efficiency of this tandem cell is known to reach 85~88% of the sum of the sub-cell's efficiencies. There are two ways of connecting sub-cells in the tandem structure, i.e. parallel and series connection. The parallel connection can increase the short circuit current (Jsc) and the series connection can increase the open circuit voltage (Voc). Although various tandem structures have been studied, the full use of incident light and optimization of cell efficiency is still limited. In this work, we designed series tandem solar cells consisting of lead sulfide (PbS) quantum dots/zinc oxide-based QDSC and zinc phthalocyanine (ZnPc)/C60-based small molecule OSCs. It is expected that the loss of the incident light is minimized because the absorption range of the PbS quantum dots and ZnPc is significantly different, and the Voc increases according to the Kirchhoff's law.

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Water Quality Improvement Evaluation of Community Sewerage by using Advanced Sewage Treatment (고도하수처리공법을 적용한 마을 하수도의 수질개선 평가)

  • Choi, Han-Kuy;Ko, Jeong-Sup;Park, Soo-Jin
    • Journal of Industrial Technology
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    • v.32 no.A
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    • pp.57-64
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    • 2012
  • In order to examine the tailorability of advanced sewage treatment of a separated sewer pipe, we observed the quality of leaked water in a reactor. A2C affiliation and MBR affiliation decreased by over 78% in cases of BOD, COD, and SS. SBR affiliation decreased by 79.1% in a case of T-N. Overall, the efficiency of T-N on the above affiliations was low. SS had the high efficiency in MBR affiliation. In the end, examination of water quality improvement showed that the quality was improved from 20% to 90%; hence, it is expected that this treatment can protect the water resources of the Hongcheon River and makes it easier to use the water of the river.

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Study on High-Efficiency Driving of a Piezo Device Using Voltage Inversion Circuit (전압 극성 전환을 통한 피에조 소자의 에너지 회수형 구동 기법 연구)

  • Park, Han-Bin;Park, Jin-Ho;Hong, Sun-Ki;Kang, Taesam
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.12
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    • pp.1843-1847
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    • 2012
  • Piezo devices have large power density and simple structure. They can generate larger force than the conventional actuators. It has also wide bandwidth with fast response in a compact size. Thus the piezo devices are expected to be used widely in the future for small actuators with fast response time and large actuating force. However, the piezo actuators need high voltage with high driving current due to their large capacitive property. In this paper, we propose a simple method to drive piezo devices using voltage inversion circuit with coil inductance. Experiments with real circuit demonstrates that the proposed scheme can improve the energy efficiency very much.

Technology Trends to High Efficiency Motors : Focused on Induction Motor (고효율 전동기 기술 동향 : 유도기 중심으로)

  • Jang, Kibong
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.65 no.6
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    • pp.995-1000
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    • 2016
  • Minimum Energy Performance Standard(MEPS) has been adapted in Korea since 2008. For at least 37 kW, IE3 efficiency class motors are now mandatory in Korea. IE4 level regulation is expected in a few years. Foreign companies are already selling IE4 class motors in the market, and the discussions on IE5 have already started. The efficiency standard of variable speed motors is scheduled for publication shortly. Recently, discussions are now beginning to prepare for IE5 in Korea. In this paper, author reviews the policies associated with a high efficent electric motors by reference to both domestic and international standards, and reviews the research direction to prepare for IE5.

A Study on the Integration of Framework National Tax Basic Act and Local Tax Basic Act (국세기본법과 지방세기본법의 통합과 체제 개편에 관한 연구)

  • Kim, Woo-Young;Kim, Keum-Young
    • Asia-Pacific Journal of Business
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    • v.9 no.2
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    • pp.75-103
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    • 2018
  • The tax system in Korea is the so-called one-item-one-tax law which has separate tax law for each taxation according to tax law. The common and procedural aspects of these tax laws are the same or similar, but they are separately prescribed by the National Tax Basic Act and the Local Tax Act. These legal systems complicate the tax law and increase the cost of tax cooperation, resulting in tax inefficiency. In this study, the National Tax Act and the laws of the Local Tax Act are integrated and presented. It is proposed that the common provisions should be integrated into a single law and the unique matters should be defined in each of the National Tax Basic Act and Local Tax Basic Act, by comparing and analyzing the provisions of the National Tax Basic Act and the Local Tax Basic Act. The integration of the common elements of the National Tax Basic Act and the Local Tax Act is expected to improve tax efficiency by reducing tax complexity and tax cooperation costs. In addition, the National Tax Act and the Local Tax Act are expected to maintain the characteristics of the National Tax Basic Act and the Local Tax Act when they are specified in the National Tax Basic Act and the Local Tax Basic Act. This study is expected to be a research that can reduce tax inefficiency and help convenience of taxpayer and tax administration.

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Protection against Aerosols by particulate Respirators and Fit Performance (방진마스크의 에어졸 방어효과와 밀착정도)

  • 한돈희
    • Journal of Environmental Health Sciences
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    • v.27 no.2
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    • pp.30-36
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    • 2001
  • This review begins with a brief expression of aerosol capture mechanism of fibrous filter(s) and performance of particulate removing respirators. The more complicated and detailed discussion is not included in this articles. Filtration efficiency and pressure drop are introduced as quality factor ( $q_{F}$) and the way in which filtration efficiency varies with particle size is discussed. Quality factors fro filters recently certified in USA were found to be very higher than those of filters made in Korea, China and USA filters certified with old certified standards. Electrically charged filters are widely used because they have high filtration efficiency and low pressure drop, but their efficiency decreases sharply at the condition occurring wet and oil mist. A discussion is given of respirator leakage through face seal and filter media with fit testing and total inward leakage testing. Since fit factor (FF) refers to the reciprocal of the fraction of the total air entering a respirator through face seal leakage , the degree of fitting performance for respirators is expected with FF. Because respirators made in Korea had generally lower FFs than respirators made in USA, it is necessary to develope respirators that fit properly for Koreans or establish regulations for fit testing.g.

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Efficiency Factors of Singlet Oxygen Generation from Core-Modified Expanded Porphyric : Tetrathiarubyrin in Ethanol

  • Ha, Jeong Hyeon;Jeong, Guk Yeong;Kim, Min Seon;Lee, Yang Hun;Sin, Gu;Kim, Yong Rok
    • Bulletin of the Korean Chemical Society
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    • v.22 no.1
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    • pp.63-67
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    • 2001
  • The photophysical properties and the singlet oxygen generation efficiency of tetrathiarubyrin have been investigated to elucidate the possibility of its use as a photodynamic therapy (PDT) photosensitizer by steady-state and time-resolved spectroscopic methods. The observed photophysical properties were affected by various molecular aspects, such as extended ${\pi}conjugation$, structural distortion, and internal heavy atom. The steady-state electronic absorption spectrum was red-shifted due to the extended $\pi-conjugation$, and the spin orbital coupling was enhanced by the structural distortion and the internal heavy atom effect. As a result of the enhanced spin orbital coupling, the triplet quantum yield increased to 0.90 $\pm$ 0.10 and the triplet state lifetime was shortened to 7.0 $\pm$ 1.2 ${\mu}s$. Since the triplet state decays at a relatively faster rate, the efficiency of the oxygen quenching of the triplet state decreases. The singlet oxygen quantum yield was estimated to be 0.52 $\pm$ 0.02, which is somewhat lower than expected. On the other hand, the efficiency of singlet oxygen generation during the oxygen quenching of triplet state, $f{\Delta}^T$, is near unity. Such high efficiency of singlet oxygen generation can be explained by the following two possible factors: The hydrogen bonding of ethanol which impedes the deactivation pathway of the charge transfer complex with oxygen to the ground state, the less probability of the aggregation formation.

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Estimation of Thruster Efficiency for Koreasat I, II under APEMAC Operation (무궁화위성1, 2호 APEMAC을 통한 추력기 효율 추정 연구)

  • Park, Young-Woong;Park, Bong-Kyu;Nam, Moon-Gyung;Bang, Hyo-Choong
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.8
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    • pp.141-147
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    • 2002
  • Estimation of thrusters efficiency is a very important process at the end of lifetime of a satellite. This paper introduces a technique to estimate the efficiency change of thrusters considering bubble effect for Koreasat I. During APEMAC(Automatic Pitch Error/ Momentum Adjust Control), the change in thruster efficiency is estimated to compare the attitude telemetry data of the Koreasat I with the results of the control logic using Simulink. The outcome of this study is expected to contribute to improving the operational load at the end of generic communication satellite mission.