• Title/Summary/Keyword: Field Environment

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Equipment Maintenance Environment Based on Field-Data of Root Industry by Manufacturing-Field Analysis (뿌리산업 제조현장 체계분석 및 데이터 기반 설비보전 환경구축)

  • Kim, Dong-Hong;Song, Jun-Yeob
    • Journal of the Korean Society for Precision Engineering
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    • v.34 no.1
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    • pp.19-22
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    • 2017
  • This paper describes the efficient equipment maintenance that can offer the exact time for repair and change of component in root industry. A conventional method offered the fixed time for repair and change of component because the method is based on early guarantee specification of the component. However the operating condition of manufacturing field is often under worse condition than early guarantee condition for high productivity. So, most components can't use until early guarantee time due to the operation of various different condition. Therefore we suggest the useful method for efficient equipment-maintenance by manufacturing-field analysis and feedback database. For this, the classification of root industry and related equipment is performed and then the detail classification of the process and component for equipment maintenance. And the monitoring module is also designed to gather data for feedback process and the environment is basically implemented for aging and reliability test.

폐광산지역 경작지 토양의 중금속 존재형태와 토양오염평가

  • 김휘중;양재의;전상호
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • 2003.04a
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    • pp.149-155
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    • 2003
  • Objectives of this research were to fractionate heavy metals in soil samples in the upper Okdong River basin and to assess the potential pollution index of each metal fraction. Soil samples were collected from cultivated land soils and analyzed for physical and chemical properties. pH of cultivated soils ranged from 5.2 to 7.6. Contents of total kelhaldal nitrogen and loss on ignition were in the ranges of 0.6∼2.5%, and 1.9∼12.9%, respectively. Heavy metals in the cultivated land soils were higher in the abandoned closed coal mine near field soils than those in the paddy soils. Total concentrations of metals in the cultivated land soils were in the orders of Zn > Pb > Ni > Cu > Cd, exceed the corrective action level of the Soil Environment Conservation Law and higher than the naturals were abundance levels reported from uncontaminated cultivated land soils. Mobile fractions of metals were relatively small compared to the total concentrations. Soil Pollution Assesment Index(SPAI) values of each fraction of metals were leveled from Non polluted to Moderately polluted based on total concentrations. SPAI values of mobil fractions were lower than those of immobile fractions. Results on metal fractions and SPAI values of the cultivated land soils indicate that field soils samples were contaminated with heavy metals and had potential to cause a detrimental effects on plants. A prompt countermeasure to prevent field soils in the abandoned closed coal mine near fields are urgently needed.

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Comprehensive Field Measurement of Indoor Air and Thermal Quality in Naturally Ventilated Office Building with Double-Skin Façade

  • Ito, Kazuhide;Shiraishi, Yasuyuki
    • International Journal of High-Rise Buildings
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    • v.2 no.4
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    • pp.293-314
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    • 2013
  • Double-Skin Façade (DSF), which is a kind of passive indoor environmental control technique, is effective way to control environmental loads while maintaining the transparency especially in perimeter zone and hence the adoption example of DSF keep increasing recently. The objective of this study was to perform a field survey of air quality environment with natural ventilation through DSF and thermal environment within office building with six stories during a mild climate period in Japan. Moreover, to understand the comprehensive environmental performance of the target building, questionnaire survey was conducted to subjectively evaluate the productivity and satisfaction with the environmental factors in office space. In this field measurement, there was a positive correlation between the DSF internal ventilation flow and the amount of solar radiation on the DSF normal surface; the primary driving force for ventilation in the DSF was considered to be the buoyancy force caused by solar radiation. The results of questionnaire survey with regard to productivity level indicated the need for improvement in the thermal (temperature) and spatial environment (room size and furniture placement).

A Study on Security Metrics and Research Trend Analysis on Cyber Resilence (보안메트릭과 사이버 내성에 대한 연구동향분석에 관한연구)

  • Lee, Sujin;Ahn, Seongjin
    • Convergence Security Journal
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    • v.18 no.1
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    • pp.3-11
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    • 2018
  • The emerging field of Science of Security (SoS) is a new paradigm that emerged in the field of security as a research field that applied the scientific approach to cyber security. It is a direction to study the formal model and automation field to secure the security of such a network environment in the present that dynamic change of complex, large scale network environment and a lot of protocol and mechanism environment exists. Therefore, this study analyzes the latest cyber security research trends such as SoS and examines the research trends of advanced countries to examine a new approach to cyber security development direction in Korea. We also analyze the current state of domestic scientific research on the scientific security research methods for various cyber security paradigms and present directions for revitalizing domestic cyber security.

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A Study on Impact of Nursing Work Environment, Interpersonal Skills, and Grit on Field Adaptation of Nurses Who Have Experienced Department Transfers (부서이동을 경험한 간호사의 간호근무환경, 대인관계능력, 그릿이 현장적응에 미치는 영향)

  • Lee, Su Jeong;Lee, Yun Mi
    • Journal of Korean Critical Care Nursing
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    • v.17 no.2
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    • pp.71-82
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    • 2024
  • Purpose : This study aims to identify the factors influencing field adaptation among nurses who have undergone department transfers, by examining the levels of and the relationships between their nursing work environment, interpersonal skills, grit, and field adaptation. Methods : The study involved 137 nurses who had experienced at least one department transfer within the last three years across two hospitals. Data analysis was performed using SPSS/WIN 29.0, involving descriptive statistics, means, standard deviations, independent t-tests, one-way ANOVA, Scheffé post-hoc tests, Pearson correlation coefficients, and multiple regression analysis (enter method). Results : Factors affecting field adaptation included the nursing work environment (β=.37, p<.001), interpersonal skills (β=.19, p=.021) and grit (β=.18, p=.025), with a total explanatory power of 31% (F=12.16, p<.001). Conclusion : This study contributes insights into effective nursing personnel management, offers foundational data for managing department transfers, and aims to improve the overall quality of nursing care.

60-Year Research History and Future Prospects in Environment Field in Korean Meteorological Society (기상학회 60년간 환경분야 연구 역사와 전망)

  • Cheol-Hee Kim;Rokjin Park;Sang-Woo Kim;Young-Hee Lee;Sang-Hyun Lee;Chang-Keun Song
    • Atmosphere
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    • v.33 no.2
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    • pp.173-195
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    • 2023
  • Research papers in the field of atmospheric environment published in three Journals: Journal of Korean Meteorological Society, Atmosphere, and Asia-Pacific Journal of the Atmospheric Sciences, are all summarized over period of 60 years since the establishment of Korea Meteorological Society (KMS) in 1963. In addition, current research trends and future outlook in the atmospheric environment field has been also highlighted. The results of historical records published in three KMS journals indicated that the activities, contents, and scope of researches carried out by KMS members in the field of atmospheric environment have yielded the enormous and rapid progress in each of the all four areas over 60 years. In particular, as the chronological progress of observational instruments and availability of satellite data such as from GEMS can be a great asset to deepen the observational and modeling researches in the current and future studies, it is highly anticipated that the more progressive and in-depth studies can be achievable to abate the air pollutants over the Korea as well as northeast Asia.

A Study of Characteristic of Electrical-magnetic and Neutron Diffraction of Long-wire High-superconductor for Reducing Energy Losses

  • Jang, Mi-Hye
    • Transactions on Electrical and Electronic Materials
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    • v.9 no.6
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    • pp.265-272
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    • 2008
  • In this paper, AC losses of long wire Bi-2223 tapes with different twist pitch of superconducting core were fabricated, measured and analyzed. These samples produced by a powder-in-tube method are multi-filamentary tape with Ag matrix. Also, it's produced by non-twist. The critical current measurement was carried out under the environment in Liquid nitrogen and in zero field by 4-prob method. And the Magnetic measurement was carried out under the environment of applied time-varying transport current by transport method. From experiment, the susceptibility measurements were conducted while cooling in a magnetic field. Flux loss measurements were conducted as a function of ramping rate, frequency and field direction. The AC flux loss increases as the twist-pitch of the tapes decreased, in agreement with the Norris Equation. Neutron-diffraction measurements have been carried out investigate the crystal structure, magnetic structures, and magnetic phase transitions in Bi-2223([Bi, Pb]:Sr:Ca:Cu:O).

3D PASSAGE NAVIGATION UNDER UNKNOWN ENVIRONMENTS BASED ON DISTANCE FIELD SPACE MODEL

  • Nagata, Yoshitaka;Murai, Yasuyuki;Tsuji, Hiroyuki;Tokumasu, Shinji
    • Proceedings of the Korean Institute of Intelligent Systems Conference
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    • 2003.09a
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    • pp.500-503
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    • 2003
  • The navigation problem of robot is one of the main themes to deal with conficts or interferences between obstacles and the robot itself In this case, while the robot avoids obstacles on the space, the passage route should be determined efficiently. In order to solve problems above, we have come up with the distance field space medel (DFM) and then, under known environment, we have presented the distance field A algorithm for passage route path search. In this research, the method of performing the 3-dimensional passage route path search of robot under unknown environment is proposed. It is shown that the authors can build the distance search model the does not need space division by taking into account of sensor information to a distance field space model, and constructing this information as virtual obstacle information.

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Field Trial of Power Line Communication Access Network over Medium Voltage Power Distribution Grid (고압 배전선로를 이용한 고속 전력선 통신 가입자망 구축 연구)

  • Lee, Jae-Jo;Oh, Hui-Myoung;Park, Young-Jin;Kim, Kwan-Ho;Lee, Dae-Young
    • Proceedings of the KIEE Conference
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    • 2005.07d
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    • pp.3040-3042
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    • 2005
  • During the last several years, interest in broad-band power line communications (PLC) has been grown over medium voltage(MV) power distribution lines as well as low voltage lines. This paper introduces a medium voltage PLC test field that is set up in the suburbs of Euiwang city in Korea. This test field could be used not only for the measurement of communication channel environment but also for internet service. This paper shows the configuration of medium voltage test field with network devices like MV signal coupler and the results of channel environment like noise and impulse response. It also shows the service performance of PLC access network through network management system.

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Simulation Study of Corona Discharge According to Flue Gas Conditions (배기가스 조건에 따른 코로나 방전 현상 시뮬레이션)

  • 정재우;조무현
    • Journal of Korean Society for Atmospheric Environment
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    • v.17 no.2
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    • pp.223-231
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    • 2001
  • In order to provide some insights into the influence of electric field, gas composition, and gas temperature on electron energy distribution and electron transport characteristics, the Boltzmann equation was solved by using cross section data for electron collisions, Critical electric fields for the corona development in dry air and flue gas are 150 and 80 Td, respectively. It was seen that the decrease of critical electric field in flue gas is mainly caused by the $H_2O$ addition through the comparison of ionization and attachment coefficients of gas components. Increase of $O_2$, $H_2O$, and $CO_2$ contents in gas affected discharge characteristics according to their reciprocal characteristics between lowering the ionization threshold and increasing the electro-negativity. As electric field increases, electrons with higher energies in the electron energy distribution also increase. The mean and characteristic electron energies also linearly increase with electric field. The variation of flue gas temperature did rarely affect on the electron energy distribution function and electron transport characteristics, because the gas temperature is several hundreds or thousands times lower than the electron temperature.

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