• Title/Summary/Keyword: 에너지소비량 비교

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A Cluster Head Selection Scheme Considering Distance and Energy between The Nodes in Wireless Sensor Networks (무선센서망에서 노드간의 거리와 에너지를 고려한 클러스터 헤드 선출방법)

  • Son, Nam-Rye;Jeong, Min-A;Lee, Seong-Ro
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.47 no.6
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    • pp.154-161
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    • 2010
  • The properties of sensor node having a restricted energy in WSN have a difficult in various application fields to apply. Our paper proposed the cluster head selection which is an effective energy in order to manage in wireless sensor network. The proposed algorithm improves an energy efficient and is applied to various network environment considering energy capacity between cluster head and nodes and distance between cluster head and base station(sink node). By using the ns-2 simulator, we evaluate the performance of the proposed scheme in comparison with the original LEACH-C. Experimental results validate our scheme, showing a better performance than original LEACH-C in terms of the number of outliving nodes and the quantity of energy consumption as time evolves.

Optimal Layout Simulation and Verification of LED Lighting for Improvement of Light Uniformity in Plant Factory (식물공장의 광 균일도 향상을 위한 LED 최적 배치 시뮬레이션 및 검증)

  • Lee, Hwa-Soo;Kwon, Sook-Youn;Lim, Jae-Hyun
    • Proceedings of the Korean Information Science Society Conference
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    • 2012.06d
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    • pp.381-383
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    • 2012
  • 식물재배용 인공광 최적 배치에 따른 균일한 조도 분포는 고품질의 식물 생산을 가능하게 한다. 그러나 기존에 상용화된 식물재배시스템의 경우, 인공광 배치에 따른 조도 분포 시뮬레이션 등의 전처리 과정이 생략된 채 제작되어 생산 품질의 편차를 초래하는 문제점을 가지고 있다. 이에 본 논문은 식물재배단의 광 균일도 향상을 위해 조명 설계 소프트웨어인 Relux를 이용하여 LED 조명장치의 높이, 간격 등의 배치를 달리함에 따라 변화하는 각 재배단의 조도 분포 및 균일도, 그리고 전체 에너지 소비량 등을 사전에 시뮬레이션 함으로써 대상 식물재배에 적합한 조명장치의 최적 위치를 파악하고자 한다. 또한, 포터블 조도측정기를 이용하여 재배단의 각 식물의 위치를 기준으로 실 측정한 결과 데이터와 비교 분석 과정을 거쳐 본 시뮬레이션 결과의 신뢰도를 입증하고자 한다.

Personalized Prediction Algorithm of Physical Activity Energy Expenditure through Comparison of Physical Activity (신체활동 비교를 통한 개인 맞춤형 신체활동 에너지 소비량 예측 알고리즘)

  • Kim, Do-Yoon;Jeon, So-Hye;Pai, Yoon-Hyung;Kim, Nam-Hyun
    • Journal of the Korea Safety Management & Science
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    • v.14 no.1
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    • pp.87-93
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    • 2012
  • The purpose of this study suggests a personalized algorithm of physical activity energy expenditure prediction through comparison and analysis of individual physical activity. The research for a 3-axial accelerometer sensor has increased the role of physical activity in promoting health and preventing chronic disease has long been established. Estimating algorithm of physical activity energy expenditure was implemented by using a tri-axial accelerometer motion detector of the SVM(Signal Vector Magnitude) of 3-axis(x, y, z). A total of 10 participants(5 males and 5 females aged between 20 and 30 years). The activities protocol consisted of three types on treadmill; participants performed three treadmill activity at three speeds(3, 5, 8 km/h). These activities were repeated four weeks.

Improvement of PEGASIS using Sub-cluster Chaining (서브 클러스터 기법을 이용한 효과적인 USN 라우팅 프로토콜)

  • Jeoung, Su-Hyung;Yoo, Hae-Young
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.9 no.6
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    • pp.1647-1652
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    • 2008
  • The PEGASIS protocol is more effective about energy consumption more than LEACH in USN environment. However, PEGASIS is weakness enemy in change of sensor network net composition because It changes BS node frequently. Therefore, we propose new routing protocol that use Sub-Cluster Chaining to solve this problem in this paper. It can reduce overhead that happen in election of middle node doing so and reduce energy consumption. Also, It can supplement limitation that PEGASIS has. This is treatise shows that new protocol that propose than existent PEGASIS through simulation is superior.

Study for Synthetic Oil Performance Test Comparing with Mineral Gear oil in an Agitator Gear Box:Power consumption, Temperature, Oil & parts life for the Heavy load gear box in the Phosphoric Acid Plant (뉴스초점 - 광유와 합성유의 에너지 소비량, 온도변화 등의 성능시험 비교 고찰)

  • Lee, Jae Keun
    • Journal of the Korean Professional Engineers Association
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    • v.45 no.6
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    • pp.28-32
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    • 2012
  • Namhae chemical is one of the largest fertilizer manufacturing company in Korea which company has operating 4 unit agitator gear boxes and producing variety kinds of fertilizer production. The gearbox operating temperature of agitator is approximated in $55^{\circ}C{\sim}90^{\circ}C$ and required to keep operating continuous without stopping. The system required high performance oil and longer oil drain interval as limited workforce in maintenance team. It was lubricated by mineral gear oil of ISO VG 320 and also need to change to new oil frequently. Namhae Chemical would expect to keep stable operating condition without shut down and consider, lower cost of operation and equipment protection.

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Biomechanical and Physiological Comparative Analysis of the Single-Radius Knee Arthroplasty Systems and Multi-Radius Knee Arthroplasty Systems (무릎인공관절 단축범위(Single-Radius) 수술자와 다축범위(Multi-Radius) 수술자의 운동역 학적 및 운동생리학적 비교분석)

  • Jin, Young-Wan;Kwak, Yi-Sub
    • Journal of Life Science
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    • v.18 no.11
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    • pp.1532-1537
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    • 2008
  • The purpose of this study was to investigate the effect of different arthroplasty designs on knee kinematic and lower limb muscular activation for up-stair and down-stair movement. 3-D video analysis of whole body and joint kinematics and EMG analysis of quadriceps and hamstrings were conducted. One-way ANOVAs were used for statistical analyses (p=0.05). The single-radius group exhibited more arthroplasty limb quadriceps EMG and hamstring coactivation EMG than the multi-radius group. Single-radius demonstrated more abduction angular displacement and reached peak abduction earlier than the multi-radius arthroplasty limb. The single- radius the percent body fat showed similar values in the Elderly, Single and Multi-radius group among the periods, however Control group was Lowered among the periods. Single-radius group limb also increased the quadriceps muscle activation level to produce more knee extension moment to compensate for the short quadriceps moment arm. Resting metabolic rate was significantly increased in control group in the period of LI. Energy expenditure was extremely increased in all groups except control group among the periods. We can say this is the exercise effects.

Structural Change in CO2 Emissions of Annex B Countries Under the Kyoto Protocol (교토의정서 Annex B 국가의 CO2 배출량 구조변화 분석)

  • Kim, Min Jung;Yang, Ji Hye;Kim, Hyun Seok
    • Environmental and Resource Economics Review
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    • v.26 no.2
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    • pp.123-138
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    • 2017
  • This study estimates the effect of the Kyoto Protocol on $CO_2$ emissions with a Quandt-Andrews test for detection of structural break with Annex B counties data. The structural break on $CO_2$ emissions took place in 2008 which is 3 year after ratification of the Kyoto Protocol. According to the empirical results, 1% increase in energy consumption leads to 1% and 0.31% increases in income before and after the structural break, respectively. This study also finds the monotonic increase relationship between $CO_2$ emission and income. Regarding to the relationship between renewable energy use and $CO_2$ emissions, 1% increase in renewable energy consumption leads to 0.1% decrease in $CO_2$ emissions until year 2007 and 0.09% decreases after year 2008, respectively. Based on the results of empirical study, we find little evidence of the effect of the Kyoto Protocol on reduction of $CO_2$ emissions for Annex B countries.

Experimental Study on Consumption of Energy and Heating Efficiency in Floor Water Heating System on Using Ondol Panel of Double Metal Rendering (이중금속융출형 온돌판넬을 이용한 바닥온수난방시스템의 난방성능과 에너지소비량에 관한 실험적 연구)

  • Bai, Dai-Kwon;Kim, Jin-Bong;Kim, Hwan-Sung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.12
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    • pp.6167-6175
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    • 2012
  • This study is experimental analysis to verify heating efficiency of Ondol in floor heating panel developed. For this one, an experiment tests producing an each test speciment and measuring heating efficiency. The result of an experiment, supplying hot water temperature is $45^{\circ}C$ and the result of measuring on parts temperature of test speciment on supplying for 8 hours, mortar surface that is superstructure plumbing of heating system developed is $49.4^{\circ}C$, the gap of piping on center of mortar surface is $44.1^{\circ}C$ and airspace is proved $25.3^{\circ}C$. In floor structure of standards, mortar surface is $46.2^{\circ}C$, the gap of piping on center of mortar surface $37.7^{\circ}C$ and airspace is $24.7^{\circ}C$. On the other hand, energy consumption accumulating of development technology is identified, in case of hot-water supply on $45^{\circ}C$ as 4,646 kcal and in existing technology, as 4,814 kcal. developing technology is verified and lower than existing technology.

Analysis of Carbon Emission from a Forward Osmosis and Reverse Osmosis Hybrid System for Water Reuse and Seawater Desalination (하수재이용 및 해수담수화를 위한 정삼투-역삼투 융합공정의 탄소배출량 분석)

  • Jeon, Jongmin;Kim, Suhan
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.3
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    • pp.351-357
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    • 2022
  • A conventional seawater reverse osmosis (SWRO) and a forward osmosis (FO) and reverse osmosis (RO) hybrid process to produce 1,000 m3/d of fresh water, were designed and compared in terms of carbon emission. When FO was adapted for the osmotic dilution, the required pressure for RO decreases, and thus energy consumption decreases. The decrease in carbon emission by decreased energy consumption (up to -0.73 kgCO2/m3 using coal as the energy source) was compared with the increase in carbon emission by the FO system (+0.16 kgCO2/m3), which is a function of various factors such as the number of FO modules and energy consumption. The comparison revealed that the FO-RO process causes less carbon emission compared with the SWRO process when the energy sources are coal and oil. However, if energy sources with low carbon emission such as solar, wind, and nuclear energy are selected, the carbon emission of the FO-RO process becomes higher than that of the SWRO process. This implies that the type of energy source is a key factor to determine the necessity of the FO-RO process from the aspect of carbon emission.

Performance Characteristics of CNG Vehicle at Various Compression Ratios (압축비 변경에 따른 CNG차량의 성능특성 연구)

  • 김봉석;이영재;고창조
    • Journal of Energy Engineering
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    • v.5 no.1
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    • pp.42-49
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    • 1996
  • Natural gas is one of the promising alternative fuels for automotive vehicles, because it has lower exhaust emissions and better fuel economy characteristics than those of gasoline, and can be used in conventional gasoline engines without major modifications. In the present study, a conventional gasoline engine was modified to a CNG engine, which can be operated with CNG only, and an engine bench test was performed to calibrate the operating parameters of the engine such as air fuel ratio, spark advance, etc. at various operating conditions. The modified CNG engine, then, was installed on a commercial gasoline vehicle and a vehicle driving test on chassis dynamometer was performed to examine the fuel economy and exhaust emission characteristics. As a result, the prototype CNG vehicle showed lower exhaust emissions and better fuel economy characteristics, but slightly reduced brake horse power, compared to the gasoline vehicle.

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