품질기능전개를 통한 품질보증시스템 설계의 사례연구

황문영,정상윤,하승철 한국산업경영시스템학회 1995 한국산업경영시스템학회지 Vol.18 No.35

종속적 준비시간을 갖는 다단계 그룹가공 생산시스템에서의 그룹스케듈링에 관한 연구

황문영 한국산업경영시스템학회 1994 한국산업경영시스템학회지 Vol.17 No.31

Group scheduling, which is a kind of operations scheduling based on the GT concept is analyzed in a multi-stage manufacturing system. The purpose of this research is to develop and evaluate a heuristic algorithm for determining gro up sequence and job sequence within each group to minimize a complex cost function, i.e. the sum of the total pe-nalty cost for tardiness and the total holding cost for flow time, in a multi-stage manufacturing system with group setup time dependent upon group sequence. A heuristic algorithm for group sc heduling is developed, and a numerical example is illustrated. For the evaluation of the pro-posed heuristic algorithm, the heuristic solution of each of 63 problems is compared with that of random scheduling. The result shows that the proposed heuristic algorithm provides better solution in light of the proposed cost function.

수면박탈 전ㆍ후 체력요인의 비교분석

황문영 한국걷기과학학회 2004 한국걷기과학학회지 Vol.3 No.-

환경오염물질 노출수준의 계절적 변이와 그 함의 - 제2기 국민환경보건기초조사(2012-2014)

황문영,류정민,권영민,홍수연,박충희 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.6

Objectives: Human biomonitoring (HBM) is a measurement of the chemicals and their metabolites in human biological samples and has been successfully employed to determine the exposure levels of environmental chemicals. In this study, we analyzed seasonal variations of the blood or urinary levels of chemicals, and assessed that these differences could affect the results of association study. Methods: The Korea National Environmental Health Survey (KoNEHS) is a nationwide survey that analyzes exposure levels of environmental pollutants, 19 kinds of chemicals including heavy metals and organic chemicals, and the exposure factors in the general population. Based on KoNEHS data, we analyzed the levels of chemicals concentrations over the total survey period (2012-2014) and each season, and assessed the association of thyroid measures with phthalate metabolite and BPA. Results: Exposure levels of blood mercury and lead were lower in summer compare to winter. Bisphenol A and PAHs metabolites were higher in spring and summer, but lower in autumn. VOCs metabolites were generally lower in summer and autumn. Phthalate metabolites were higher in all other seasons than in winter. Pyrethroid metabolite, 3-PBA, was higher in summer and autumn. Regarding seasonal variation of chemical exposures, the statistical significance and size of effects between thyroid measures and phthalate and BPA were changed with season. Conclusion: Seasonal variations of chemical exposure and health outcome should be considered for interpreting biomonitoring results from a public health context.

항공우주구조물의 충격 감지를 위한 PNN-PZT/CNT/Epoxy 페인트 센서의 압전 특성 변화에 관한 연구

황문영,강명철,강래형 한국항공우주학회 2015 한국항공우주학회 학술발표회 논문집 Vol.2015 No.11

본 연구에서는 항공우주구조물의 충격 감지를 위한 압전페인트 센서의 압전특성이 CNT 첨가에 따라 어떻게 변화하는지 기술하였다. 연구에 사용된 압전 페인트 센서는 유연 압전 재료인 PNN-PZT 와 에폭시 수지를 무게비 1:1 로 혼합하여 제작하였다. 그 후, Multi-walled CNT 가 압전 페인트 센서내에서 잘 분산될 수 있도록 아세톤 용매 내에서 초음파처리(Sonication)하였다. 60 x 10 x 1mm³ 크기의 몰드에서 제작된 시편의 위아래 면에 실버 페이스트를 사용하여 전극을 제작하였다. 분극전계는 4kV/mm 로 고정한 상태에서 분극 시간을 달리하여 상온에서 분극 작업을 시행했다. 시편에 가해지는 충격 망치의 힘에 대하여 센서에서 발생하는 출력 전압을 비교하여 살펴보았으며, 그 결과 CNT 가 첨가된 센서가 그렇지 않은 센서에 비해 감도향상이 있음을 확인할 수 있었다. In this study, the piezoelectric characteristic changes of a piezoelectric paint sensor with CNT for impact monitoring of aerospace structures was described. The piezoelectric paint sensor is composed of Pb(Ni₁/₃Nb⅔)03-Pb(Zr, Ti)O₂ (PNNPZT) powder and epoxy resin with 1:1 weight ratio, and multi-walled CNT used in the study is sonicated in acetone to increase a degree of dispersion. The dimensions of the paint specimen were 60 x 10 x 1 mm³, and the top and bottom plates were both coated with a silver paste. At room temperature, during the poling treatment, the electric field was set to 4kV/mm and the poling time was controlled to examine its effect on the piezoelectric properties. The sensitivity of paint sensor was compared by detecting output voltage from specimen when the impact hammer hits the specimen. In conclusion, it is founded the sensitivity of sensor with CNT is higher than that of sensor which didn’t use CNT.

안전기준 미고시 생활화학제품의 살생물물질 활성성분 분석법 개선

황문영,김유진,심기태,김민애,양해원,김주현,권명희 환경독성보건학회 2019 한국독성학회 심포지움 및 학술발표회 Vol.2019 No.10

주거환경 및 개인 생활습관에 따른 화학물질 노출수준 차이 - 국민환경보건기초조사

황문영,홍수연,권영민,조혜정,박충희 한국환경보건학회 2019 한국환경보건학회지 Vol.45 No.2

Objectives: The aim of this study was to determine environmental chemical exposure related to residential and personal lifestyle characteristics in the adult Korean population. The observations of this study can provide information useful for developing reduction approaches for exposure to chemicals among the general adult population. Methods: The second stage of the Korean National Environmental Health Survey (KoNHES) was conducted from 2012 to 2014, with 6,478 persons participating. Using the results of the survey, the relationship between exposure levels of heavy metals and organic chemicals and exposure factors, e.g. residential and personal lifestyle characteristics, were analyzed. Results: The exposure levels of VOCs and PAHs were significantly lower in participants living at a distance of more than 100 m from roads versus living closer to roads. Home ventilation lowered VOC and PAH exposure but did not lower chemical exposure from household products. Use of public transportation showed lower exposure to heavy metals, VOCs, and PAHs. Current smoker was significantly higher for levels of heavy metals, VOCs, and PAHs, and the exposure trend was similar for current drinkers. Physical activity was related with higher exposure to phthalates and environmental phenols. Conclusion: Our observations based on a nationally representative population for Korea show that exposure to chemicals varies by residential and personal lifestyle, and this should be considered for developing appropriate mitigation measures and policies. Given the health concerns surrounding environmental chemicals, it is necessary to develop comprehensive measures to reduce chemical exposure.

직접교수법에 기반을 둔 시험전략 교수가 읽기학습부진 학생의 학업성취도 및 학습동기에 미치는 영향

황문영,강옥려 한국학습장애학회 2014 학습장애연구 Vol.11 No.2

본 연구는 직접교수법에 기반을 둔 시험전략 교수가 읽기학습부진 학생의 학업성취도 및 학습동기에 미치는 영향을 알아보고자 하였다. 이를 위해 초등학교 5학년에 재학 중인 20명의 읽기학습부진 학생을 선정하여, 실험집단은 직접교수법에 기반을 둔 시험전략을 교수하고 통제집단은 교수하지 않았다. 중재 는 회기 당 30분씩 매주 3회 총 20회기에 걸쳐 진행하였다. 그리고 공부는 하지 않고 시험전략의 사용 만으로 높은 학업성취를 기대하는 것은 부적절하므로 중재기간 동안 대상 학생 모두에게 방과 후 국어 과 보정지도를 실시하였다. 중재 효과를 검증하기 위하여 학업성취도 평가와 학습동기 검사를 사전과 사후에 각각 실시하였고, 학업성취도의 진전도 분석을 위해 중재기간 동안 형성평가도 실시하였다. 연 구 결과는 공분산분석(ANCOVA)을 사용하여 분석하였으며 얻어진 결과는 다음과 같았다. 첫째, 직접교 수법에 기반을 둔 시험전략 교수는 읽기학습부진 학생의 학업성취도에 긍정적 영향을 미쳤다. 둘째, 직 접교수법에 기반을 둔 시험전략 일반화-활성화 단계에서 학업성취 진전도가 가장 높았다. 셋째, 직접교 수법에 기반을 둔 시험전략 교수는 읽기학습부진 학생의 학습동기와 학습동기 하위요인인 부과된 동기, 확인된 동기 및 내적동기에 긍정적 영향을 미쳤다. 결론적으로 직접교수법에 기반을 둔 시험전략 교수 는 읽기학습부진 학생의 학업성취도 및 학습동기를 향상시켰다. 후속 연구에서는 직접교수법에 기반을 둔 시험전략을 다양한 학습상황에서 여러 특징을 가진 학생들을 대상으로 적용할 필요가 있다.

A Design of Air Compressor Remote Control System Using USN Technology

황문영 한국인공지능학회 2018 인공지능연구 (KJAI) Vol.6 No.1

Compressed Air is an important energy source used in most factories nowadays. The automation trend using air compressor has been gradually increasing with the interest of the 4th industry in recent years. With the air compressor system, it is possible to construct the device at low cost and easily achieve automation and energy saving. In addition, With trend of FA, miniaturation and light weight manufacturing trend expand their use in the electronics, medical, and food sectors. Research method is to design the technology for the remote control of the following information as USN base. Development of flexible sensing module from real time observation module for fusion of IT technology in compressed air systems, design and manufacture of flexible sensing module, and realiability assessment. Design of real-time integrated management system for observation data of compressed air system - Ability to process observation data measured in real time into pre-processing and analysis data. This study expects unconventionally decreasing effect of energy cost that takes up 60~70% of air compressor layout and operation and maintenance management cost through USN(Ubiquitous Sensor Network) technology by using optimum operational condition from real time observation module. In addition, by preventing maintenance cost from malfunction of air compressor beforehand, maintenance cost is anticipated to cut back

클라우드 컴퓨팅 환경에 적합한 사용자 중심의 ID관리기술

황문영,곽진 한국지식정보기술학회 2010 한국지식정보기술학회 논문지 Vol.5 No.1

The Cloud Computing is one of the attention techniques which outsourcing of IT resources. It used ID Federation for efficient management of user's recognition ID on services. However, ID Federation is not offering management system of user privacy information for managed himself/herself. Thus, user suffer a great damage such as invasion of privacy or plagiarize user information from a malicious attacker. In this paper, we propose user-centric ID management technique that provide security and right to control own information in cloud computing environment.