• Title/Summary/Keyword: Environmental Control System

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A Human Sensibility Meter for Indoor Environmental Control Using Multiple Sensors (다중 센서를 이용한 실내 환경 제어용 감성 측정기)

  • Lee, Duk-Dong;Park, Kil-Heum;Choi, Doo-Hyun;Han, Dae-Hyun;Baek, Woon-Yi;Lim, Jeong-Ok;Hwang, Tae-Jin
    • Journal of Sensor Science and Technology
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    • v.7 no.5
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    • pp.327-333
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    • 1998
  • A new human sensibility (kansei) meter that can measure human sensibility at the indoor environment is developed in this paper. Four sensors that can measure temperature, humidity, $CO_2$ and $C_4H_{10}$ concentrations are used. Among these sensors, the first three are used to determine the human sensibility. And the last to protect human from the harmful gas. First of all, human sensibilities are defined for each sensor datum, and then those are linearly combined to make a final human sensibility (kansei). The efficiency and usefulness of the meter are verified using a simulator on Windows 95 and a stand-alone system constructed using a microprocessor.

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Characterization of Styrene Catabolic Genes of Pseudomonas putida SN1 and Construction of a Recombinant Escherichia coli Containing Styrene Monooxygenase Gene for the Production of (S)-Styrene Oxide

  • Park Mi-So;Bae Jong-Won;Han Ju-Hee;Lee Eun-Yeol;Lee Sun-Gu;Park Sung-Hoon
    • Journal of Microbiology and Biotechnology
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    • v.16 no.7
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    • pp.1032-1040
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    • 2006
  • Some Pseudomonas species can grow on styrene as a sole carbon and energy source. From the new isolate Pseudomonas putida SN1, the genes for styrene catabolism were cloned and sequenced. They were composed of four structural genes for styrene monooxygenase (styA and styB), styrene oxide isomerase (styC), and phenylacetaldehyde dehydrogenase (styD), along with two genes for the regulatory system (styS and styR). All the genes showed high DNA sequence (91% to 99%) and amino acid sequence (94% to 100%) similarities with the corresponding genes of the previously reported styrene-degrading Pseudomonas strains. A recombinant Escherichia coli to contain the styrene monooxygenase from the SN1 was constructed under the control of the T7 promoter for the production of enantiopure (S)-styrene oxide, which is an important chiral building block in organic synthesis. The recombinant E. coli could convert styrene into an enantiopure (S)-styrene oxide (ee >99%) when induced by IPTG The maximum activity was observed as 140 U/g cell, when induced with 1 mM IPTG at $15^{\circ}C$.

Paddy Rice Culture Experiment Using Treated Sewage Effluent From Constructed Wetland (인공습지 오수처리수를 이용한 벼재배 실험)

  • 윤춘경;함종화;우선호;김민희
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.43 no.2
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    • pp.94-104
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    • 2001
  • A pilot study was performed at the experimental field of Konkuk University in Seoul, to examine the feasibility of the constructed wetland system for sewage and the effect of treated sewage irrigation on the paddy rice culture and its soil characteristics. The constructed wetland performed well, in that effluent concentrations of pollutants were significantly lower than concentrations of the influent. Median removal efficiencies of BOD$_{5}$ was about 78% and slightly lower during winter. Removal efficiencies form TN and TP were approximately 48 and 21%, respectively, and relatively less effective than that of BOD$_{5}$. Irrigation of treated sewage to paddy rice culture did not affect adversely in both growth and yield of rice. Instead, plots of treated sewage irrigation showed up to 50% more yield in average than the control plot. It implies that treated sewage irrigation might be beneficial to rice culture rather than detrimental as long as it is treated adequately and used properly. Soil was sampled and analyzed before transplanting and after harvesting. pH was slightly increased due to irrigation water, but it may not be concerned as long as the treated sewage is within the normal range. EC was increased in first year but decreased in second year, therefore salts accumulation in the soil could be less concerned. OM and CES was slightly increased, which might be beneficial on growing plants. TN did not show apparent pattern. Available phosphorus was decreased after rice culture, but the quantity of phosphorus(TP-available phosphorus) was rather increased which implies that excessive phosphorus supply may result in phosphorus accumulation in the soil. Overall, the constructed wetland was thought to be an effective sewage treatment alternative, and treated sewage could be reused as a supplemental source of irrigation water for paddy rice culture without causing adverse effect as long as it is treated adequately and used properly. For full-scale application, further investigation should be followed on environmental risk assessment, tolerable water quality, and fraction of supplemental irrigation.ion.

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A study on the approach to reduce in the aviation GHG emissions in Korea (항공온실가스 배출현황 및 감축규제 대응방안)

  • Lee, Juhyoung;kim, Wonho;Kim, Yongseok;Choi, Sungwon
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.24 no.1
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    • pp.47-54
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    • 2016
  • Global aviation is projected to grow in demand by an annual average of 4.1% between 2014 and 2034. It can be said that environmental impact from aviation will therefore be expected to increase on a similar scale. As regards civil aviation emissions, the sector contributes between 2~3% to International aviation GHG emissions. In the European Union(EU), aviation emissions account for about 3% of the EU's total green house gas emissions, of which a majority are said to come from international flights. In terms of traffic volume in 2013, Korea's international aviation industry 11th with regard to passengers and 3rd with regard to cargo, attaining the overall rank of 5th in the world. GHG emissions has been increasing steadily over the last 4 years, averaging 3.9 percent a year, due to the growth of low cost carriers and the increased demand for air transportations. As for aviation in Korea, there are a number of means intended to attain the Government's emission control objective in an efficient manner, such as AVA (Agreement of Voluntary Activity), TMS (Target Management System) and ETS (Emission Trading Scheme). In addition, the Government intends to better adapt to ICAO's Global MBM(Market-based Measures) that will come into performance on Year 2020. In the study, we focused on GHG mitigation measures that is fulfilling the AVA, TMS, ETS in the Government and suggest the effective measures to reduction the aviation GHG emissions.

Relationship of job-satisfaction due to Radiographer's Job-Characteristics and Job-Stress (방사선사의 직무특성 및 직무스트레스에 따른 직무만족도의 관계)

  • Lee, Mi-Hwa
    • The Journal of the Korea Contents Association
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    • v.15 no.8
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    • pp.408-415
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    • 2015
  • This study investigated the job-satisfaction of the Radiographer's job-characteristics and job-stress. A total of 213 Radiographer were surveyed using a self-administered questionnaire. The 105 questionnaires consist of general characteristics, job characteristics, occupational stress, and job satisfaction. The job satisfaction was categorized into 3 sub-scales; psychological variables, environmental variables, and structural variables. The occupational stress was categorized into 8 sub-scales; physical environment, job demand, insufficient job control, interpersonal conflict, job insecurity, organizational system, lack of reward, and occupational climate. 30 years old than 30 years later, people are highly rewarding than a low person, this person is lower than people with high sense of duty, place the larger the size of Seoul, hospital than fat, than people who do not have turnover intention this, job insecurity, organizational structure, inadequate compensation, workplace culture, physical environment, people with low job satisfaction is higher than men were. As such there is a need to identify the cause because otherwise indicated differences in job satisfaction.

A Study on the Design of Fault-Tolerant Sensor Routing Algorithm for Monitoring of Ship Environmental Information (선박내 환경 정보 모니터링을 위한 고장 감래 센서 라우팅 알고리즘 모델 설계에 관한 연구)

  • Park, Yoon-Young;Yun, Nam-Sik;Bae, Ji-Hye;Kong, Heon-Tag
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.11 no.4
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    • pp.1333-1341
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    • 2010
  • The goal of this research is to enhance the maintenance and monitoring system of ship environment using sensor network. It is important to know the location information of sensor nodes to control the sensors and to obtain the sensor data from sensor network inside the ship. In this paper, we address the grouping and routing mechanism according to the relative distance of sensor nodes, based on LEACH and PEGASIS. We also consider the fault tolerant mechanism using the location information of sensor nodes.

Synthesis and Crystallization of Hydrazinium Nitroformate(HNF) as Eco-friendly Oxidizer (친환경 산화제 HNF 합성 및 결정화 연구)

  • Kim, Jina;Kim, Min Jun;Min, Byoung Sun
    • Journal of the Korean Society of Propulsion Engineers
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    • v.19 no.4
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    • pp.69-76
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    • 2015
  • Recently, environmental sustainability of the transitional explosives and propellants is an issue of growing importance in energetic materials. For examples, ammonium perchlorate(AP) as an solid propellants oxidizer could create a poisonous gas and atmospheric pollutions, such as HCl. Among the several oxidizers, hydrazinium nitroformate(HNF) is an effective candidate substance for eco-friendly oxidizer, which has high density, pressure index, and less smog generating property during combustion for the Divert and Attitude Control System(DACS). This study was confirmed a synthesis through various conditions, was performed for the essential data of solubility the crystallization process. Also, crystallization process such as cooling, drowning-out and sonication were performed.

A Study on Performance Characteristics of an Evaporative Heat Exchanger with Mini-channels (환경조절장치용 미세유로형 증발열교환기의 성능특성 연구)

  • Lee, Hyung-Ju;Yoo, Young-June;Min, Seong-Ki;Hwang, Ki-Young
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.247-253
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    • 2011
  • An experimental study on performance characteristics of an evaporative heat exchanger based on tests for various operating conditions was presented. The heat exchanger maximizes the heat transfer rate per unit volume by applying mini-channels for both the air and coolant flow paths, and minimizes the amount of the coolant by using its latent heat of evaporation. The heat exchanger was manufactured by etching the flow paths, brazing the heat exchange plates, and welding the in/out ports of the media. The basic performance test has confirmed that the heat exchanger met its design requirements, and the results of the map test were analyzed to produce the performance characteristics quantitatively depending on the air inlet temperature, the air flow rate, and the coolant flow rate.

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Cancer Incidence in Southwest of Iran: First Report from Khuzestan Population-Based Cancer Registry, 2002-2009

  • Talaiezadeh, Abdolhassan;Tabesh, Hamed;Sattari, Alireza;Ebrahimi, Shahram
    • Asian Pacific Journal of Cancer Prevention
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    • v.14 no.12
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    • pp.7517-7522
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    • 2013
  • Background: Cancer incidence rates are increasing particularly in developing countries. It is crucial for policy makers to know basic cancer epidemiology in each region to design comprehensive prevention plans. There have hitherto been no population-based data available for cancer in Khuzestan province. The present report is a first from the regional population-based cancer registry for the period of 2002-2009. Materials and Methods: Data were collected retrospectively reviewing all new cancer patients whom were registered in Khuzestan province cancer registry during an 8-year period (2002-2009). All cases were coded based on the ICD-O-3 coding system and collected data were computerized using SPSS (Chicago, IL) software, version 11.5. The age standardized incidence rates (ASRs) per 100,000 person-year for all cancers were computed using the indirect method of standardization to the world population. Results: During the 8-year study period, 16,801 new cancer cases were registered. Based on the computed ASRs, the five most frequent malignancies in females were breast (26.4 per 100,000), skin (13.6), colorectal (5.72), stomach (4.31) and bladder(4.07) and in males, the five most frequent were skin (16.0 per 100,000), bladder (10.7),prostate (7.64), stomach (7.17), and colorectal (6.32).The ASR for all malignancies in women was 92.5 per 100,000, and that for men was 87.4. Conclusions: The observed patterns from the analysis of Khuzestan cancer registry data will lead to better understanding of the epidemiology of various malignancies in this part ofthe country and consequently provide a useful guide for authorities to make efficacious decisions and policies about a cancer control program for south-west Iran.

Ozone Simulations over the Seoul Metropolitan Area for a 2007 June Episode, Part I: Evaluating Volatile Organic Compounds Emissions Speciated for the SAPRC99 Chemical Mechanism (2007년 6월 수도권 오존모사 I - 광화학측정자료를 이용한 SAPRC99 화학종별 휘발성유기물질 배출량 입력자료 평가)

  • Kim, Soon-Tae
    • Journal of Korean Society for Atmospheric Environment
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    • v.27 no.5
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    • pp.580-602
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    • 2011
  • Volatile organic compound (VOC) emissions in the 2007 CAPSS (Clean Air Protection Supporting System) emissions inventory are chemically speciated for the SAPRC99 (Statewide Air Pollution Research Center 99) mechanism, following the Source Classification Code (SCC) matching method to borrow the U.S.EPA's chemical speciation profiles. CMAQ simulations with High-order Direct Decoupled Method (HDDM) are in turn applied to evaluate uncertainty in the method by comparing the simulated model VOC species to the observations in the Seoul Metropolitan Area (SMA) for a 2007 June episode. Simulations under-predicted ALK1 to ALK4 in SAPRC99 by a factor of 2 to 5 and over-predicted ALK5 by a factor of 7.5 while ARO1, ARO2, OLE1, and ethylene (ETH) are comparable to the observations, showing relative difference by 10 to 30%. OLE2 emissions are roughly 4 times overestimated. Emission rates for individual VOC model species are revised referring to the ratio of simulated to observed concentrations. Impact of the VOC emission changes on the overall ozone prediction was insignificant for the days of which 1-hr maximum ozone are lower than 100 ppb. However, simulations showed ozone difference by 5 to 10 ppb when high ozone above 120 ppb was observed in the vicinity of Seoul. This result suggests that evaluations on individual model VOC emissions be necessary to lead ozone control plans to the right direction. Moreover, the simulated ratios of ARO1 and ARO2 to $NO_x$ are roughly 50% lower than the observed ones, which imply that adjustment in $NO_x$ and VOC emission rates may be required to mimic the real VOC/$NO_x$ condition over the area.