• Title/Summary/Keyword: actual EMC

Search Result 14, Processing Time 0.027 seconds

Annual Variation in Temperature, Relative Humidity and Equilibrium Moisture Content of Wood in Indoor (옥내(屋內)의 온도(溫度), 상대습도(相對濕度)와 목재(木材) 평형함수율(平衡含水率)의 연중(年中) 변이(變異))

  • Jung, Hee-Suk;Lee, Nam-Ho
    • Journal of Korean Society of Forest Science
    • /
    • v.83 no.4
    • /
    • pp.540-544
    • /
    • 1994
  • Equilibrium moisture contents(EMC) were calculated based on temperature and relative humidity of atmosphere and actual EMCs were measured at intervals of ten days in previous air-dried wood samples for seven different species including Douglas fir and oaks in four indoor locations in central region for one year. Mean annual air temperature and relative humidity were $23.3^{\circ}C$ and 54.9% in bedroom, $22.4^{\circ}C$ and 59.5% in living room of apartment, $20.1^{\circ}C$ and 57.0% in office room and 19.4 and 64.0% in living room of tile-roofed house, respectively. Mean annual calculated and actual EMCs were 10.2 and 9.7% in bedroom, 11.1 and 10.2% in living room of apartment, 10.7 and 10.4% in office room, and 12.1 and 12.5% in living room of tile-roofed, house, respectively. Actual EMC of kasai were higher than average value of EMC for seven species. However, those of sycamore and apitong were lower than average value.

  • PDF

Measurement of effective cure shrinkage of EMC using dielectric sensor and FBG sensor (유전 센서 및 광섬유 센서를 이용한 EMC 유효 경화 수축 측정)

  • Baek, Jeong-hyeon;Park, Dong-woon;Kim, Hak-sung
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.29 no.4
    • /
    • pp.83-87
    • /
    • 2022
  • Recently, as the thickness of the semiconductor package becomes thinner, warpage has become a major issue. Since the warpage is caused by differences in material properties between package components, it is essential to precisely evaluate the material properties of the EMC(Epoxy molding compound), one of the main components, to predict the warpage accurately. Especially, the cure shrinkage of the EMC is generated during the curing process, and among them, the effective cure shrinkage that occurs after the gelation point is a key factor in warpage. In this study, the gelation point of the EMC was defined from the dissipation factor measured using the dielectric sensor during the curing process similar with actual semiconductor package. In addition, DSC (Differential scanning calorimetry) test and rheometer test were conducted to analyze the dielectrometry measurement. As a result, the dielectrometry was verified to be an effective method for monitoring the curing status of the EMC. Simultaneously, the strain transition of the EMC during the curing process was measured using the FBG (Fiber Bragg grating) sensor. From these results, the effective cure shrinkage of the EMC during the curing process was measured.

Reduction Techniques of Electromagnetic Disturbance and Characteristics of measurement result for the small electric power control system (소전력 제어시스템의 EMC 저감기술 및 특성)

  • Kim, Soon-Gi;Ahn, Jang-Yul;Yi, Chin-Woo
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
    • /
    • 2005.05a
    • /
    • pp.372-377
    • /
    • 2005
  • EMC(Electromagnetic Compatibility) is the ability of an electronic device that operates properly in its intended electromagnetic environment and not be a source of pollution to that environment. The designer anticipates EMC problems at beginning of the process and finds remaining problems in early prototype stages, and tests the final prototypes for EMC as thoroughly as possible. This is a more cost-effective method. In this paper, it analyzes EMC problems that were appeared in actual measurement of electric power control device and presents reduction technique of these problems.

  • PDF

Development of the EMC-based Empirical Model for Estimating Pollutant Loads from Small Agricultural Watersheds (농촌 소유역에서 EMC를 이용한 오염물질 부하량 산정기법의 개발)

  • Kim, Young-Chul;Kim, Geon-Ha;Lee, Dong-Ryul
    • Journal of Korea Water Resources Association
    • /
    • v.36 no.4
    • /
    • pp.691-703
    • /
    • 2003
  • In this paper, a new and integrated approach easily used to calculate the pollutant loads from agricultural watersheds is suggested. Basic concepts of this empirical tool are based on the hypotheses that variations in event mean concentrations(EMCs) of the pollutants from a given agricultural watershed during rainstorms are only due to the rainfall pattern. This assumption would be feasible to agricultural watersheds whose land uses does not change during the cultivation period overlapped by rainy season and also in which point-sources of the pollutants are rare. Therefore, if EMC data sets through extensive sampling from various rural areas are available, it is possible to establish relationships between EMCs, shapes and land uses of the watersheds, and rainfall events. For this purpose, fifty one sets of EMC values were obtained from nine different watersheds, and those data were used to develop predictive tools for the EMCs of 55, COD, TN and TP in rainfall runoff. The results of the statistical tests for those formulas show that they are not only fairly good in predicting actual EMC values of some parameters, but also useful in terms of calculating pollutant loads on any time-spans such as the day of rainfall event or weekly, monthly, and yearly. Their applicability was briefly demonstrated and discussed. Also, the unit loads calculated from EMCs based on different land uses and real rainfall data over one of the watershed used for this study. were provided, and they are compared with other well-known unit loads.

Servo Drives State of the Art in Industrial Applications - A Survey

  • Kennel, R.;Kobs, G.;Weber, R.
    • Journal of Power Electronics
    • /
    • v.2 no.1
    • /
    • pp.25-31
    • /
    • 2002
  • Servo drives with microcomputer control provide the possibility of using modern and sophisticated control algorithms. As an additional feature it is possible to implement parallel and/or redundant software and hardware structures to realise safe motion or similar security functions. Unfortunately microcomputer control also has some impact on the behaviour of servo drives. Control algorithm, cycle time, sensors and interface have to be perfectly synchronised. Special control schemes are necessary on the line side (power supply) to meet the actual requirements concerning EMC. This contribution presents experiences and results obtained from a modern digital drive system pointing out the influences of low and high accuracy position sensors and the interdependencies mentioned above.

Estimation of Representative Runoff Ratio from Paddy Field for the Application of EMC Method (EMC 방법적용을 위한 논 대표 유출률 산정)

  • Choi, Dongho;Jung, Jaewoon;Yoon, Kwangsik;Jin, Sohyun;Choi, Wooyoung;Choi, Woojung;Kim, Sangdon;Yim, Byungjin;Choi, Yujin
    • Journal of Korean Society on Water Environment
    • /
    • v.26 no.6
    • /
    • pp.943-947
    • /
    • 2010
  • Runoff ratio of paddy fields for the application of Event Mean Concentration (EMC) method was studied. To measure actual runoff ratio of paddy fields, a field monitoring was conducted for 2008 ~ 2009 period. Long-term rainfall data of four cities in major river basins were analyzed and weighting factors were developed to consider temporal and spatial variation of rainfall distribution of Korean peninsula. The observed runoff ratio ranged 0.00 ~ 1.20 and arithmetic mean were 0.25, respectively. However, the representative runoff ratio for paddy fields was determined as 0.41 according to the method suggested by National Institute of Environmental Research (NIER).

A Study on the Concentration Analysis of Roadside Air Pollutants

  • CHOI, Jong-Sun;JUNG, Min-Jae;LEE, Jun-Cheol;KWON, Woo-Taeg
    • Journal of Wellbeing Management and Applied Psychology
    • /
    • v.4 no.2
    • /
    • pp.35-41
    • /
    • 2021
  • Purpose: In this study, volatile organic compounds(VOCs) and aldehydes generated from roadside vehicles and other pollutants were measured and analyzed. Research design, data and methodology: As a result of measuring and analyzing three areas near the roadside, Vinyl chloride 0.00 ~ 0.02 ppb, Benzene 2.87 ~ 5.01 ppb. Toluene 4.51 ~ 8.62 ppb, Styrene 0.00 ~ 0.34 ppb, Formaldehyde 8.45 ~ 17.12 ug/m3, Acetaldehyde 7.01 ~ 17.64 ug/m3 were detected. When comparing the analysis results and the 6-month average concentration of the hazardous air monitoring network, the analysis results were about 26 times higher for Benzene, about 5 times for Toluene, and about 3.75 times for Styrene. In the case of vinyl chloride, it was confirmed that it was about 20 times lower than that of the hazardous atmosphere monitoring network. Results: Therefore, it is necessary to reexamine the installation location of the measurement network because people are exposed to pollutants on the actual roadside. It is judged that it is right to build a measurement network that is practically helpful to people by increasing the measurement items in the measurement network.

Servo Drives State of the Art in Industrial Applications - A Survey

  • Kennel R.;Kobs G.;Weber R.
    • Proceedings of the KIPE Conference
    • /
    • 2001.10a
    • /
    • pp.321-325
    • /
    • 2001
  • Servo drives with microcomputer control provide the possibility of using modem and sophisticated control algorithms. As an additional feature it is possible to implement parallel and/or redundant software and hardware structures to realise safe motion or similar security functions. Unfortunately microcomputer control also has some impact on the behaviour of servo drives. Control algorithm, cycle time, sensors and interface have to be perfectly synchronised. Special control schemes are necessary on the line side (power supply) to meet the actual requirements concerning EMC. This contribution presents experiences and results obtained from a modem digital drive system pointing out the influences of low and high accuracy position sensors and the interdependencies mentioned above.

  • PDF

Use of Dummy Antenna to Monopole Antenna Factor (더미 안테나를 사용한 모노폴 안테나 보정계수 추출)

  • 안형배;이종악
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.13 no.9
    • /
    • pp.932-936
    • /
    • 2002
  • This paper has been studied a calibration techniques in CISPR A for 1 m monopole antenna factor in the frequency range below 30 MHz. The equivalent capacitance substitution method uses a dummy antenna in place of the actual rod element. Dummy antenna measure frequency from 150 kHz to 30 MHz and good results factor from 150 kHz to 25 MHz compare to using 1 m monopole antenna factor. It will be use to substitute dummy antenna factor for 1 m monopole antenna factor.

A Study on De-wiring at Electric Railway Trolley wire and Pantograph (전기철도 전차선과 판토그래프 이선에 대한 연구)

  • Shin, Seung-Chul;Kim, Jae-Chul;Han, Seong-Ho;Lee, Su-Gil
    • Proceedings of the KIEE Conference
    • /
    • 2006.07a
    • /
    • pp.319-320
    • /
    • 2006
  • At this study, one of the electrical problems, arc characteristics according to loss of contact between a pantograph and a catenary, was analyzed. A characteristic of arc current is disappeared in a short period of time. Nevertheless, it has large current same as a surge, so that it has EMI/EMC problems. In the case of the electrical railway system, there is oscillation and de-wiring. The are current is generated by these problems. The result of this study can be used as a facility design to prevent a surge and needs to prove through actual field data in the main circuit of an electric train for a precise analysis about effect of are.

  • PDF