• 제목/요약/키워드: Operational improvements

검색결과 153건 처리시간 0.026초

제조부문의 6시그마 활동 운영 실태에 관한 연구 (A Study on Operational Status of the Six Sigma Action in Manufacturing Industry)

  • 문제옥;윤성필
    • 품질경영학회지
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    • 제45권1호
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    • pp.1-10
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    • 2017
  • Purpose: Most enterprises adopt six sigma acts to maximize the business performance with raising the executiveness for the project improvements in each parts. But there are little studies about six sigma actual operations in manufacturing whether the six sigma improvements that have injected a lot of budget, efforts, labours and time are run properly. Methods: This study select 31 interviewees who have MBB or BB from 5 large enterprises running six sigma over 10 years and 5 SMEs running six sigma over 5 years to understand and review the operational status of six sigma actions in manufacturing industry and to secure representativeness. This study identify the operational status of six sigma actions and key factors enhancing or impeding execution of six sigma projects through face-to-face interviews and online surveys by e-mail. Results: This study figured out the operational status of six sigma actions and key factors enhancing or impeding execution of six sigma projects. We used SPSS 16.0 for the reliability and the validity of survey data. Conclusion: There can be a lot of different factors that affect six sigma project improvements besides the key factors from this study. More study need to think of the organization characteristics and the basic conditions and to remedy the unreasonable points and defects rather than following foreign companies and enterprises.

기상청 기후예측시스템(GloSea6) - Part 1: 운영 체계 및 개선 사항 (The KMA Global Seasonal Forecasting System (GloSea6) - Part 1: Operational System and Improvements)

  • 김혜리;이조한;현유경;황승언
    • 대기
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    • 제31권3호
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    • pp.341-359
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    • 2021
  • This technical note introduces the new Korea Meteorological Administration (KMA) Global Seasonal forecasting system version 6 (GloSea6) to provide a reference for future scientific works on GloSea6. We describe the main areas of progress and improvements to the current GloSea5 in the scientific and technical aspects of all the GloSea6 components - atmosphere, land, ocean, and sea-ice models. Also, the operational architectures of GloSea6 installed on the new KMA supercomputer are presented. It includes (1) pre-processes for atmospheric and ocean initial conditions with the quasi-real-time land surface initialization system, (2) the configurations for model runs to produce sets of forecasts and hindcasts, (3) the ensemble statistical prediction system, and (4) the verification system. The changes of operational frameworks and computing systems are also reported, including Rose/Cylc - a new framework equipped with suite configurations and workflows for operationally managing and running Glosea6. In addition, we conduct the first-ever run with GloSea6 and evaluate the potential of GloSea6 compared to GloSea5 in terms of verification against reanalysis and observations, using a one-month case of June 2020. The GloSea6 yields improvements in model performance for some variables in some regions; for example, the root mean squared error of 500 hPa geopotential height over the tropics is reduced by about 52%. These experimental results show that GloSea6 is a promising system for improved seasonal forecasts.

항공 탄소 배출 감소를 위한 운영 개선 방안 연구 (A Study on Operational Improvements for Reducing Carbon Emissions from Aviation)

  • 김성미;김은미;임상훈;황호원
    • 한국항행학회논문지
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    • 제27권1호
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    • pp.119-125
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    • 2023
  • 항공 산업의 지속 가능한 발전을 위해서는 항공에서 발생하는 온실가스(이산화탄소)를 줄여야 한다. 운영 개선으로 항공부문의 탄소 감축에 크게 기여할 수는 없지만, 단시간 내에 실질적으로 배출을 감소할 수 있다. ICAO는 글로벌 항공 교통 관리와 운영 절차를 최적화하기 위해 GANP와 ASBU를 개발하였고, 각국은 이를 이행하기 위해 인프라 확충과 기술 개발에 노력을 기울여야 한다. 운영 개선의 합법적 장벽은 시카고 협약의 영공주권개념으로 국가는 국경에 기반한 비효율적인 관제를 하거나, 자국 영공의 통과를 제한하거나 금지할 수 있어 항공기 우회경로 운항으로 탄소 배출이 증가한다. 그러나 시카고 협약은 체약국에 영공의 자유를 무제한 부여하지 않으며, 영공 주권개념을 시대 흐름에 맞추어 해석한다면 원활한 항공 운영 개선을 이룰 수 있을 것이다.

Safety Management in Norwegian Fish Farming: Current Status, Challenges, and Further Improvements

  • Thorvaldsen, Trine;Storkersen, Kristine;Kongsvik, Trond;Holmen, Ingunn Marie
    • Safety and Health at Work
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    • 제12권1호
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    • pp.28-34
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    • 2021
  • Background: Safety management is required to ensure health and safety of personnel in Norwegian fish farming. However, few studies have addressed the status and practical relevance of this risk-reducing measure. Methods: This article provides new knowledge through interviews with 35 employees at different company levels, addressing perceptions of various safety management activities according to managers and operational personnel. Results: The interviews show that managers and operational personnel at fish farms agree that the quantity of measures aimed to improve safety has increased in recent years. However, some activities are perceived to have higher practical relevance than others. In general, measures that fit well with the practical reality are well received by the employees at the fish farms. Conclusion: Suggested improvements include involving operational personnel in the design of procedures, considering all risk dimensions that may affect occupational health and safety, and challenging the value of specific safety activities based on a detailed knowledge of the distinctive characteristics of work practice in fish farming.

아파트 커뮤니티 프로그램 운영 평가를 통한 주민주도형 운영 매뉴얼 개발 (The Development of Resident-driven Operational Manual through the Evaluation of Community Programs in Apartment Complexes)

  • 강순주;김진영;이보배
    • 한국주거학회논문집
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    • 제25권3호
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    • pp.131-143
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    • 2014
  • The purpose of this study is to develop an operation manual of resident-driven community program by evaluating community program operation to realize a sustainable apartment complex and vitalize a community. To achieve this purpose, 8 community experts, who are in charge of 42 complexes of 7 autonomous districts among 25 districts in Seoul were interviewed from September 2013 to December 2013. Main results of the study are as follows. 1) Operational problems and improvements are deduced from evaluating operation process of community programs. It is found that smooth cooperation of main operators including a community vitalization association, a resident representative meeting and a control office is the most important. 2) Operation guideline for representative programs are suggested based on analysis of operational characteristics of 3 types of community programs; communication, recycling and environment management, according to program operation elements; material element, programming element, human element and finance element. 3) An operation manual of resident-oriented community program is presented after considering evaluation of operation processes and analysis of 3 types of operational elements of community programs.

Study on The Development of Basic Simulation Network for Operational Transient Analysis of The CANDU Power Plant

  • Park, Jong-Woon;Lim, Jae-cheon;Suh, Jae-seung;Chung, Ji-bum;Kim, Sung-Bae
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 1995년도 추계학술발표회논문집(1)
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    • pp.423-428
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    • 1995
  • Simulation models have been developed to predict the overall behavior of the CANDU plant systems during normal operational transients. For real time simulation purpose, simplified thermal hydraulic models are applied with appropriate system control logics, which include primary heat transport system solver with its component models and secondary side system models. The secondary side models are mainly used to provide boundary conditions for primary system calculation and to accomodate plant power control logics. Also, for the effective use of simulation package, hardware oriented basic simulation network has been established with appropriate graphic display system. Through validation with typical plant power maneuvering cases using proven plant performance analysis computer code, the present simulation package shows reasonable capability in the prediction of the dynamic behavior of plant variables during operational transients of CANDU plant, which means that this simulation tool can be utilized as a basic framework for full scope simulation network through further improvements.

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A Power-Efficient CMOS Adaptive Biasing Operational Transconductance Amplifier

  • Torfifard, Jafar;A'ain, Abu Khari Bin
    • ETRI Journal
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    • 제35권2호
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    • pp.226-233
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    • 2013
  • This paper presents a two-stage power-efficient class-AB operational transconductance amplifier (OTA) based on an adaptive biasing circuit suited to low-power dissipation and low-voltage operation. The OTA shows significant improvements in driving capability and power dissipation owing to the novel adaptive biasing circuit. The OTA dissipates only $0.4{\mu}W$ from a supply voltage of ${\pm}0.6V$ and exhibits excellent high driving, which results in a slew rate improvement of more than 250 times that of the conventional class-AB amplifier. The design is fabricated using $0.18-{\mu}m$ CMOS technology.

An Approach for Reducing Carbon-14 Stack Emissions via Optimal Use of Ion Exchang Resins at CANDU Plant

  • Sohn, Wook;Chi, Jun-Ha;Kang, Duk-Won
    • 한국에너지공학회:학술대회논문집
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    • 한국에너지공학회 2003년도 춘계 학술발표회 논문집
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    • pp.445-455
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    • 2003
  • Relatively high carbon-14 emissions, which occurred at PHWR Plant during 1998 and 1999, made the site staff to implement several operational improvements: 1) the frequency and volume of the moderator cover gas purging were reduced through increased $O_2$ additions to the cover gas, 2) the 'old' resin columns were not used during re-start of the reactor from outage, 3) efforts were made to minimize air ingress, 4) the maximum service time of moderator ion-exchange columns were restricted to about 80 days. Through the improvements, the carbon-14 emission from each PHWR reactor returned to the normal levels during the remainder of 1999 and during 2000. We carried out a special surveillance at W-1 and W-3 from September 2001 to August 2002 to properly evaluate ways to optimize the use of moderator ion exchange resins from a C-14 perspective. The surveillance showed that only data that provided an operational marker for deciding when to remove the IX-resin column is an observed increase in the C-14 stack emissions themselves. Also, it is shown that any increase over the rate of 0.4 Ci $month^{-1}$ for two consecutive weeks may be the indication for an ion-exchange resin column change, especially if the IX-resin column has been in service for more than 80 days.

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기상청 기후예측시스템(GloSea6) - Part 2: 기후모의 평균 오차 특성 분석 (The KMA Global Seasonal forecasting system (GloSea6) - Part 2: Climatological Mean Bias Characteristics)

  • 현유경;이조한;신범철;최유나;김지영;이상민;지희숙;부경온;임소민;김혜리;류영;박연희;박형식;추성호;현승훤;황승언
    • 대기
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    • 제32권2호
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    • pp.87-101
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    • 2022
  • In this paper, the performance improvement for the new KMA's Climate Prediction System (GloSea6), which has been built and tested in 2021, is presented by assessing the bias distribution of basic variables from 24 years of GloSea6 hindcasts. Along with the upgrade from GloSea5 to GloSea6, the performance of GloSea6 can be regarded as notable in many respects: improvements in (i) negative bias of geopotential height over the tropical and mid-latitude troposphere and over polar stratosphere in boreal summer; (ii) cold bias of tropospheric temperature; (iii) underestimation of mid-latitude jets; (iv) dry bias in the lower troposphere; (v) cold tongue bias in the equatorial SST and the warm bias of Southern Ocean, suggesting the potential of improvements to the major climate variability in GloSea6. The warm surface temperature in the northern hemisphere continent in summer is eliminated by using CDF-matched soil-moisture initials. However, the cold bias in high latitude snow-covered area in winter still needs to be improved in the future. The intensification of the westerly winds of the summer Asian monsoon and the weakening of the northwest Pacific high, which are considered to be major errors in the GloSea system, had not been significantly improved. However, both the use of increased number of ensembles and the initial conditions at the closest initial dates reveals possibility to improve these biases. It is also noted that the effect of ensemble expansion mainly contributes to the improvement of annual variability over high latitudes and polar regions.

'저비용 고효율'의 무기체계 개발을 위한 군 작전요구성능 관리절차 개선 방안 (A Management Procedure of Required Operational Capability for 'Low-cost and High-efficiency' Weapon Systems Development)

  • 이옥규;강석중
    • 한국통신학회논문지
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    • 제37권1C호
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    • pp.109-117
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    • 2012
  • 최근 70여 년간의 주요 전쟁을 통해 본 무기체계의 핵심적 변화중 하나는 IT 활용을 통한 무기체계의 복합화 및 첨단화라 할 수 있다. 이러한 무기체계의 복합화 및 첨단화 추세는 IT의 효과적인 활용, 전력화 기간 단축, 복합 첨단 무기체계에 대한 명확한 운용개념(Operational Concept) 수립, 작전요구성능(ROC : Required Operational Capability) 관리 등을 포함하여 무기체계 개발 절차 전반에 대한 혁신적인 개선을 요구하고 있다. 특히, 새로운 무기체계에 대한 명확한 운용개념 수렴과 이를 근간으로 도출된 작전요구성능에 대한 체계적인 관리는 '저비용 고효율'의 무기체계 개발, 나아가 성공적인 군사력 건설을 위한 핵심 선결 과제라 할 수 있다. 본 논문에서는 한국군의 현 작전요구성능 관리절차 분석을 통해 요구공학 (Requirements Engineering) 개념에서의 요구사항 도출(Elicitation) 및 분석(Analysis)과 요구사항 확인(Validation)측면을 고려한 개선 방안을 제안 한다.