• Title/Summary/Keyword: permitted limit

Search Result 71, Processing Time 0.031 seconds

Permitted Limit Setting Method for Data Transmission in Wireless Sensor Network (무선 센서 네트워크에서 데이터 전송 허용범위의 설정 방법)

  • Lee, Dae-hee;Cho, Kyoung-woo;Oh, Chang-heon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
    • /
    • 2018.05a
    • /
    • pp.574-575
    • /
    • 2018
  • The generation of redundant data according to the spatial-temporal correlation in a wireless sensor network that reduces the network lifetime by consuming unnecessary energy. In this paper, data collection experiment through the particulate matter sensor is carried out to confirm the spatial-temporal data redundancy and we propose permitted limit setting method for data transmission to solve this problem. In the proposed method, the data transmission permitted limit is set by using the integrated average value in the cluster. The set permitted limit reduces the redundant data of the member node and it is shows that redundant data reduction is possible even in a variable environment of collected data by resetting the permitted limit in the cluster head.

  • PDF

Prediction of the Noise Levels for a Plant (공장 소음도 예측)

  • 윤세철;김태구;오종민
    • Journal of the Korean Society of Safety
    • /
    • v.15 no.3
    • /
    • pp.88-95
    • /
    • 2000
  • The level of noise produced by machinery and its arrangement insides a factory is indicated to be a maximum of 96.1 dB(A). The maximum level of noise from a commoner's house outside the factory is shown to be 62.9 dB(A), which exceeds 60 dB(A), the permitted limit of noise level in a time period of day. us study has predicted the level of noise reduction according to a step by step prevention plan by considering the characteristics of the causes of noise, the permitted limit of noise levels, problems and economical efficiency attendant upon the noise prevention measures. Establishing target levels of noise each of the three steps of the noise prevention plan. The predicted level of noise at the place of a commoner's house in accordance with the first step is 50.0 - 59.0 dB(A), and can satisfy the permitted limit of noise in a time period of the day. In taking prevention measures for the second step, the noise level is 50.7 - 53.6 dB(A) which is less than 55 dB(A) in a time period of the evening, the permitted limit of noise in a time period of night., and it can meet 47.4 - 50.3 dB(A) in the third step.

  • PDF

A Basic Study on Securing Welfare Space in Crew Accommodation for Fishers Working in Coastal and Inshore Fisheries (연근해 어선원 복지 공간 확보를 위한 기초 연구)

  • KIM, Ki-Sun;HAN, Se-Hyun;CHO, Jang-Won
    • Journal of Fisheries and Marine Sciences Education
    • /
    • v.29 no.3
    • /
    • pp.811-821
    • /
    • 2017
  • This paper intends to propose the direction for improving the welfare space in crew accommodation of fishing vessels engaged in coastal and inshore fishery business in order to solve the phenomenon which young fishers trend to avoid working on fishing vessels. Coastal and inshore fisheries are defined as permitted fisheries business under the Fisheries Act and classified into coastal fisheries and inshore fisheries based on a gross tonnage of 10 tons. Fisheries Act also stipulates the upper limit tonnage regulation and the restrictions on bottoms of fishing vessels permitted for coastal and inshore fisheries to protect fishery resources and to prevent overfishing. It is difficult to increase the welfare space in crew accommodation of fishers under such restrictions because the welfare space in crew accommodation could be secured by reducing the space for the strength of fishing. Therefore, this paper compares the revision trend of the international convention(The Work in Fishing Convention, 2007) and domestic laws on welfare space in crew accommodation of fishing vessels engaged in coastal and inshore fishery business to find out the problems and improvement points in securing the welfare space in crew accommodation of fishing vessels. As a result, it is proposed to revise the Enforcement Ordinance of the Fisheries Act so as to secure the welfare space in crew accommodation of coastal and inshore fishing vessels within the scope of maintaining the maximum allowable tonnage limit regulation by adding an exemption provisions of the restrictions on bottoms of fishing vessels in which case the gross tonnage is increased for securing the spaces for crew accommodation and sanitary facilities of fishers without increasing net tonnage where the bottoms of fishing vessels is increased by renovating or replacing the fishing vessels bigger than the bottoms of fishing vessels permitted within the scope of maintaining the maximum allowable tonnage limit regulation.

Assessment of Can Factory working noise and its reduction (산업현장의 소음.진동 원인분석 및 저감방안 연구)

  • Chun, Hyung-Jun;Ko, Sun-Hee;Chang, Seo-Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2006.11a
    • /
    • pp.212-216
    • /
    • 2006
  • The purpose of this study is to obtain an effective enclosing method for noise reduction of press machine operating in a manufacturing company located in Korea. Noise level of the machine is about $90{\sim}105dB$ which is higher than legal standards by industrial safety and health law. This study has predicted the level of noise reduction according to a step by step prevention plan by considering the characteristics of the cause of noise, the permitted limit of noise levels, problems and economical efficiency attendant upon the noise prevention measures. The predicted level of noise at the plant in accordance with the first step is $71.5{\sim}89.5dB(A)$, and can satisfy the permitted limit of noise in a time period of the day. Based on these results, enclosing method adequate for the selected plant's noise characteristics were suggested.

  • PDF

Applying the Disinfecting Effects of Vinegar to Raw Vegetables in Foodservice Operations: A Focused Microbiological Quality Evaluation (급식소에서 이용되는 채소류의 식초수 소독의 적용을 위한 연구 - 미생물적 품질 평가를 중심으로 -)

  • Kim, Hyun-Jung;Kim, Heh-Young;Ko, Sung-Hee
    • Korean journal of food and cookery science
    • /
    • v.23 no.4 s.100
    • /
    • pp.567-578
    • /
    • 2007
  • This study was designed to provide basic data for the application and practical use of vinegar disinfection for raw vegetable preparation in foodservice operations. The test materials were washed and disinfected by three different methods(tap water washing, chlorine water disinfection, vinegar disinfection) and stored at $3^{\circ}C$ and $10^{\circ}C$ for 7 days. Then, their microbiological qualities were compared. Total plate counts increased over the course of the storage period, and all samples, except in the case of tap water washing, remained under the permitted limit until the 7th day of storage. In particular, vinegar disinfection showed the lowest increase in total plate counts(2.35${\sim}$4.03 log CFU/g). While the total plate counts of chlorine and vinegar disinfection were within the 6.00 limit of microbiological safety, the tap water washing treatment passed the permitted limit. The psychrotrophic counts increased steadily over the course of the storage period, and increased least at $3^{\circ}C$, however, the tap water washing showed the most drastic increase, while vinegar disinfection yielded the smallest increase.

The Effective Image Diagnosis Using Curved MPR from MDCT (MDCT에서 Curved MPR을 이용한 효과적인 영상진단)

  • Song, Jong-Nam;Jang, Yeong-Ill
    • Korean Journal of Digital Imaging in Medicine
    • /
    • v.12 no.2
    • /
    • pp.139-143
    • /
    • 2010
  • Two-dimensional(2D) images like Multi Planar Reconstruction(MPR) Image or Maximum Intensity Projection(MIP) were used for the purpose of diagnosis, but MPR image's quality were limited due to its superior limit of Z-axis ability to produce permitted radiation exposure virtuous in the permitted time limit from the existing Spiral CT. However, in company with the development of the Multi Detector Computed Tomography(MDCT), we were able to get the Data with the equal amount of Voxel, also get varied reconstructions as in the aspect of our needs. This present study propose a reconstruction technique which is to extract a field using Region of interest(ROI) segmentation method for improvement of the quality of the medical image and after that reconstruct the concerned part using the four-directed symmetry method of the oval, than using the reconstructed data, reorganize the image by using the Curved MPR method. If current proposed method is used, it is highly effective because of its ability to accurately display the disease concerned part, which will reduce the decoding time and also effectively provide information based on the accuracy of the decode.

  • PDF

Heat Analysis of Built-In Spindle Motor for High-Speed Machine Tools (공작기계용 고속 내장형 스핀들 모터의 열 해석)

  • Sim, Dae-Gon;Song, Seung-Hoon;Cho, Yoon-Hoo;Cho, Sung-Hoon
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.17 no.8
    • /
    • pp.71-77
    • /
    • 2000
  • The built-in spindle motor for high-speed machine tools is designed and developed by Corporate R&D Institute of DAEWOO Heavy Industries LTD. The heat analysis program for the built-in spindle motor is developed by using lumped method. For the purpose of verification of the program comparison analyses between experiments and calculations are performed on the three motors ; DHI prototype of built-in spindle motor built-in spindle motor sample A and sample B As results calculated temperature distributions are in good agreement with the test results within the average error of 10% Calculated results of all the built-in spindle motors show that maximum temperature rise at high speed remains in the operating condition without exceeding the permitted limit but they exceeded the permitted limit of temperature rise at low speed.

  • PDF

A Study on the Efficient Polling Architecture Design for SNMP (SNMP 기반의 효율적인 데이터 수집 방식에 대한 연구)

  • 윤병수;김채영
    • Proceedings of the IEEK Conference
    • /
    • 2002.06a
    • /
    • pp.271-274
    • /
    • 2002
  • This paper presents tile efficient polling architecture for simple network management protocol (SNMP). Now a day, tile internet traffics have been increasing rapidly within a few years as the subscriber's network to connect internet is provided commonly. With this trend, the network management traffics also make the same phases. To provide numerous higher Quality services to the customers, the management traffic must be controlled within the permitted limit. This paper proposes the policy-based felling architecture for SNMP MIB with several parameters and suggests the data collecting layer architecture for the efficient polling.

  • PDF

Influences on Concrete Quality of Residue Content Change of Chemical Admixtures (화학혼화제 고형분량 변동이 콘크리트 품질에 미치는 영향)

  • Kim, Jin-Cheol;Yoo, Hyeok-Jin;Kim, Hong-Sam;Jeong, Ho-Jin
    • Journal of the Korea Concrete Institute
    • /
    • v.26 no.4
    • /
    • pp.457-463
    • /
    • 2014
  • The permitted limit, ${\pm}12%$, of the change in solid contents based on ASTM C 494 as an interim standard in Korea Expressway Corporation, can not reflect the kind of chemical admixture and the characteristics of solid content so that it differed depending on the admixture types. In this study, effect of cement concrete quality was investigated by solid changes which can be used chemical admixtures acceptance criteria. As a result of an evaluation of a change in the quality of concrete due to solid content, since Ligno-sulfonate based (LG) had a low water reducing ratio, the range of the change in solid content was great while Naphthalene sulfonated based (PNS) and Poly-carboxylate based (PC) High Range Water-reducing Admixtures (HRWR) had a high water reducing ratio, the permitted limit of the difference in solid content currently used as the acceptance criterion should be readjusted. As a result, it is found that the acceptable range must be managed within 10% and 5% when the solid contents less than 25% and more than 25%, respectively.

Investigation on the Nonideality of 12-Bit Sigma-Delta Modulator with a Signal Bandwidth of 1 MHz (1MHz 신호 대역폭출 갖는 12-비트 Sigma-Delta 변조기의 비이상성에 대한 조사)

  • 최경진;조성익;신홍규
    • The Journal of Korean Institute of Communications and Information Sciences
    • /
    • v.26 no.11A
    • /
    • pp.1812-1819
    • /
    • 2001
  • In this paper, it investigated the permitted limit of the analog nonideality for the SOSOC Σ-Δ modulator design which is satisfied with 1 [MHz] signal bandwidth and 12-bit resolution in the OSR=25. Firstly, it get the SOSOC Σ-Δ modulator model and gain coefficient which is suitable in low voltage for the Σ-Δ modulator design which is satisfied with the specification in the supply voltage 3.3 [Vl. And it provided the performance prediction of the Σ-Δ modulator and the permitted limit of the nonideality by adding the performance degradation facts of the Σ-Δ modulator such as the finite gain of the amplifier, the SR, the closed-loop pole, the switch ON resistance and the capacitor mismatch to the ideal Σ-Δ modulator model. When designed the Σ-Δ modulator which is satisfied with the specification by the base above, it will be able to predict the performance of the Σ-Δ modulator and the guide for the specification of the circuit which composes the Σ-Δ modulator.

  • PDF