• Safety and Health at Work
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• 제5권2호
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• pp.106-111
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• 2014

Background: The manufacture of paint involves a variety of processes that present with medical hazards. Safety initiatives are hence introduced to limit hazard exposures and promote workplace safety. This aim of this study is to assess the use of available control measures/initiatives in selected paint factories in Lagos West Senatorial District, Nigeria. Methods: A total of 400 randomly selected paint factory workers were involved in the study. A well-structured World Health Organization standard questionnaire was designed and distributed to the workers to elicit information on awareness to occupational hazards, use of personal protective devices, and commonly experienced adverse symptoms. Urine samples were obtained from 50 workers randomly selected from these 400 participants, and the concentrations of the heavy metals (lead, cadmium, arsenic, and chromium) were determined using atomic absorption spectroscopy. Results: The results show that 72.5% of the respondents are aware of the hazards associated with their jobs; 30% have had formal training on hazards and safety measures; 40% do not use personal protective devices, and 90% of the respondents reported symptoms relating to hazard exposure. There was a statistically significant (p < 0.05) increase in the mean heavy metal concentrations in the urine samples obtained from paint factory workers as compared with nonfactory workers. Conclusion: The need to develop effective frameworks that will initiate the integration and ensure implementation of safety regulations in paint factories is evident. Where these exist, there is a need to promote adherence to these practice guidelines.

• 한국물환경학회지
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• 제34권5호
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• pp.462-469
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• 2018

There are differences in method and cycle of flow rate survey depending on purpose of the operating department. To verify and use results of flow data according to the purpose, flow data of the directly measured and tele monitoring system were compared to verify validity. Flow measurement in the Ministry of Environment is aimed at setting up a standard flow of target water quality for water quality management and securing flow data of low and normal water level seasons for water quality evaluation. In this study, correlation analysis result ($R^2$) of same time zone data by direct measurement and tele monitoring system (TMS) at Seombon D point, a unit watershed of Seomjin river, for six years ('10 ~ '15) according to implementation of Total Daily Maximum Load (TDML) was wading 0.716, boating 0.962 and on bridge 0.943, and effectiveness of measurement method was verified by characteristics of flow duration as a season of dry and low-water; normal and high water are appropriate for wading, boating, and on bridge respectively. Results revealed it is reasonable to use directly measured results using the wading and boating method for low water level and dry seasons, and TMS data for rainy seasons. It can be used important data for future policy decisions.

• 전기학회논문지P
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• 제59권3호
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• pp.279-287
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• 2010

Interior permanent magnet synchronous motor(IPMSM) adjustable speed drives offer significant advantages over induction motor drives in a wide variety of industrial applications such as high power density, high efficiency, improved dynamic performance and reliability. This paper proposes efficiency optimization control of IPMSM drive using adaptive fuzzy learning controller(AFLC). In order to optimize the efficiency the loss minimization algorithm is developed based on motor model and operating condition. The d-axis armature current is utilized to minimize the losses of the IPMSM in a closed loop vector control environment. The design of the current based on adaptive fuzzy control using model reference and the estimation of the speed based on neural network using ANN controller. The controllable electrical loss which consists of the copper loss and the iron loss can be minimized by the optimal control of the armature current. The minimization of loss is possible to realize efficiency optimization control for the proposed IPMSM. The optimal current can be decided according to the operating speed and the load conditions. This paper considers the design and implementation of novel technique of high performance speed control for IPMSM using AFLC. Also, this paper proposes speed control of IPMSM using AFLC1, current control of AFLC2 and AFLC3, and estimation of speed using ANN controller. The proposed control algorithm is applied to IPMSM drive system controlled AFLC, the operating characteristics controlled by efficiency optimization control are examined in detail.

• 한국학교수학회논문집
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• 제17권2호
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• pp.275-290
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• 2014

이 연구는 중등학교의 서술형 논술형 평가에 대해 교사들이 갖고 있는 인식과 실제 서술형 논술형 평가를 학교에 어떻게 적용하고 있는지 현황을 파악하기 위한 것이다. 이에 따라 서울특별시와 경기도, 인천에 위치한 중학교의 수학 교사들을(189명) 대상으로 설문을 실시하였다. 그 결과, 첫째, 중등 수학 교사들은 서술형 논술형 평가의 주된 목표를 학습 목표에 따른 성취도 측정, 학생의 창의성과 사고력 신장 등으로 인식하는 것으로 나타났다. 둘째, 교사들은 서술형 논술형 평가의 효과에 대하여 학생들의 수학적 사고력과 문제해결력이 향상될 것으로 인식하고 있었다. 셋째, 서술형 논술형 평가의 실시 현황은 서술형 논술형 문항의 비율이 수행평가에서는 20%미만, 지필평가에서는 20~40%가 가장 높은 것으로 나타났다. 넷째, 수학과 서술형 논술형 평가를 학교의 정기고사에서 실시하는 경우가 가장 높은 비율로 나타났다.

• 전력전자학회논문지
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• 제7권1호
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• pp.81-90
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• 2002

본 논문은 직접토크제어에 의한 리럭턴스 동기 전동기의 위치센서 없는 고성능 제어시스템을 제안한다. 이 시스템은 고정자 자속관측기, 속도/토크 관측기, 두 개의 디지털 히스테리시스 제어기, 최적 스위칭 룩업 테이블, IGBT 전압형 인버터, 그리고 TMS320C31 DSP보드로 구성된다. 넓은 속도 범위에서의 안정된 응답특성을 얻기 위해서 전동기 단자에서 얻어진 전압과 전류를 사용하는 폐루프 자속관측기를 사용하였다. 개발된 고성능 속도제어 시스템의 동특성을 검증하기 위해서 1.0[kW] 리럭턴스 동기 전동기를 사용하여 시뮬레이션과 실험을 수행한 결과 저속영역과 고속영역 모두 우수한 동특성을 얻을 수 있었다.

• 대한방사선기술학회지:방사선기술과학
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• 제28권2호
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• pp.79-89
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• 2005

본 연구는 방사성동위원소 및 방사선 응용 분야에 있어서 우리나라가 연구개발 사업을 추진하는 데 도움이 될 수 있도록 국제원자력기구(IAEA) 프로그램의 현황을 검토하고 향후 전망을 제시하였다. 특히 국제기구를 통한 공동연구 프로그램 참여를 증진시킬 수 있도록 IAEA 프로그램 참여시 이점을 고찰하고 이의 필요성을 강조하였다. 또한 신규 참여 증진을 위한 방향을 제시하고 이의 효율적인 운영 방안을 제안하였다. 본 논문에서 제시된 전략과 구체적인 방안이 향후 국제공동연구 확대를 위한 정책 수립에 활용되고, 방사선기술 응용 연구를 수행하는 국내 산 학 연 연구기관의 국제공동연구 참여 증진에 기여할 수 있기를 기대한다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제24권5호
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• pp.432-442
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• 2021

Purpose: The aim of this study was to evaluate the nutrient content consumed by children and adolescents on home-prepared versus chef-prepared specific carbohydrate diets (SCD) as therapy for inflammatory bowel disease (IBD). Methods: Dietary intake of two cohorts with active IBD initiating the SCD over 12 weeks was assessed. The home-prepared cohort received detailed guidance from dietitians on implementation of the SCD. The chef in the other cohort was knowledgeable in the SCD and prepared meals from a fixed set of recipes. Data from 3-day diet diaries at 4 different time points were collected. US Recommended Daily Allowances (RDA) were calculated for macronutrients, vitamins, and minerals. Results: Eight participants on the homemade SCD and 5 participants on the chef-prepared SCD were included in analysis. Mean % RDA for energy intake was 115% and 87% for homemade and chef-prepared groups (p<0.01). Mean % RDA for protein intake was 337% for homemade SCD and 216% for chef-prepared SCD (p<0.01). The homemade SCD group had higher mean % RDA values for vitamin A and iron, while the chef-prepared SCD group had higher intake of vitamins B1, B2, D, phosphorus and zinc (p<0.01 for all). Conclusion: The SCD implemented homemade versus chef-prepared can result in significantly different intake of nutrients and this may influence efficacy of this dietary therapy. Meal preparation dynamics and the motivation of families who pursue dietary treatment may play an important role on the foods consumed and the outcomes on dietary therapy with the SCD.

• 산업경영시스템학회지
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• 제42권3호
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• pp.25-38
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• 2019

This study is to develop a diagnostic model for the effective introduction of smart factories in the manufacturing industry, to diagnose SMEs that have difficulties in building their own smart factory compared to large enterprise, to identify the current level and to present directions for implementation. IT, AT, and OT experts diagnosed 18 SMEs using the "Smart Factory Capacity Diagnosis Tool" developed for smart factory level assessment of companies. They analyzed the results and assessed the level by smart factory diagnosis categories. Companies' smart factory diagnostic mean score is 322 out of 1000 points, between 1 level (check) and 2 level (monitoring). According to diagnosis category, Factory Field Basic, R&D, Production/Logistics/Quality Control, Supply Chain Management and Reference Information Standardization are high but Strategy, Facility Automation, Equipment Control, Data/Information System and Effect Analysis are low. There was little difference in smart factory level depending on whether IT system was built or not. Also, Companies with large sales amount were not necessarily advantageous to smart factories. This study will help SMEs who are interested in smart factory. In order to build smart factory, it is necessary to analyze the market trends, SW/ICT and establish a smart factory strategy suitable for the company considering the characteristics of industry and business environment.

• 한국간호교육학회지
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• 제27권4호
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• pp.369-380
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• 2021

Purpose: The objectives of this research are to verify the development and effectiveness of a nursing student emotional competency promotion program that is important in professional nursing strategies for strengthening the psychological well-being of patients. Methods: This research was done by developing an emotional competency promotion program for nursing students according to the analysis, design, development, implementation, evaluation (ADDIE) model. Apply the program to students and evaluate their effects on their self-awareness, self-management, social awareness, relationship management and self-efficacy using a nonequivalent control group pretest-posttest design. The subjects of this research were 48 nursing students enrolled in the department of nursing of D College; 24 students were placed in the experimental group and 24 students were in the control group. The experimental group participated in the developed program from December 18, 2017 to January 12, 2018, for a total of 8 sessions. Each session was 120 minutes long. For data collection, a pretest, posttest 1 and 2 were performed using an independent t-test and repeated measure ANOVA using SPSS/WIN 22.0. Results: The experimental group who participated in the emotional competency promotion program showed higher self awareness (F=5.65, p=.005), self management (F=11.12, p<.001), social awareness (F=5.02, p=.009), relationship management (F=11.22, p<.001) and self-efficacy (F=14.24, p<.001) than the control group. These results were supported by a statistically meaningful difference in the time period and the interaction between the time period and the two groups. Conclusion: The study's findings indicate that the emotional competency promotion program developed through this study is effective at increasing the self-awareness, self-management, social awareness, relationship management and self-efficacy of nursing students.

• 대한교통학회지
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• 제33권4호
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• pp.393-404
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• 2015

기존의 중력모형은 통행비용 변수만으로 존 간 특성을 설명하기 때문에 많은 한계점을 갖게 된다. 현대 도시의 통행 패턴은 거리나 비용뿐만이 아니라 존 별 특성과 교통인프라 수준 등의 영향을 받기 때문이다. 따라서 장래 통행을 합리적으로 추정하기 위해서는 이러한 특성을 고려한 모형이 개발되어야 한다. 본 연구는 이러한 관점에서 접근성 변수를 중력모형의 설명 변수로 도입하였다. 이와 함께 변수가 추가에 따른 2단계 정산기법을 제안하였다. 이는 통행저항함수의 계수를 회귀분석을 통해 우선 추정한 뒤, 존별 균형인자를 순차적으로 추정하는 방법이다. RMSE, E-norm, C.R을 활용한 접근성을 도입한 중력모형의 검증 결과, 기존의 중력모형보다 통행패턴의 구현 능력이 향상된 점을 확인하였다. 특히, 단거리 통행량 추정에 어려움을 겪은 기존 모형의 한계점을 해결하였다는 점이 주목할 만 하다. 결론적으로 본 연구는 새로운 중력모형의 정산기법을 제안함과 동시에 접근성 변수의 도입을 통해 존 간 특성을 구현하였다는 점에서 통행분포모형의 개선 가능성을 제시하였다.