다중 작업 학습 구조 기반 공정단계별 공정조건 및 성형품의 품질 특성을 반영한 사출성형품 품질 예측 신경망의 성능 개선에 대한 연구

이효은,이준한,김종선,조구영 한국금형공학회 2023 한국금형공학회지 Vol.17 No.4

Injection molding is a process widely used in various industries because of its high production speed and ease of mass production during the plastic manufacturing process, and the product is molded by injecting molten plastic into the mold at high speed and pressure. Since process conditions such as resin and mold temperature mutually affect the process and the quality of the molded product, it is difficult to accurately predict quality through mathematical or statistical methods. Recently, studies to predict the quality of injection molded products by applying artificial neural networks, which are known to be very useful for analyzing nonlinear types of problems, are actively underway. In this study, structural optimization of neural networks was conducted by applying multi-task learning techniques according to the characteristics of the input and output parameters of the artificial neural network. A structure reflecting the characteristics of each process step was applied to the input parameters, and a structure reflecting the quality characteristics of the injection molded part was applied to the output parameters using multi-tasking learning. Building an artificial neural network to predict the three qualities (mass, diameter, height) of injection-molded product under six process conditions (melt temperature, mold temperature, injection speed, packing pressure, pacing time, cooling time) and comparing its performance with the existing neural network, we observed enhancements in prediction accuracy for mass, diameter, and height by approximately 69.38%, 24.87%, and 39.87%, respectively.

웹애널리틱스를 이용한 아카이브 이용자 분석 사례 연구

이효은,임진희 한국기록학회 2015 기록학연구 Vol.0 No.45

Record Information Services is an aggressive action of connecting documentaries focusing on the information needs of user. However, recent studies on the parliament’s written information service recognize the necessity that it should segment the user’s information requests, and provide personalized service, but have not discussed for specific cases or measures. While the importance of Web services written with the proliferation of information and popularization of the Web is emerging right to know but, it is not being performed properly by lack of sufficient manpower and budget along with lack of recognition in hands-on sites upon the user analysis. So, while increasing the efficiency of the hands-on workers of Record Information Services, the introduction of analytical tools that can be utilized in low budget agencies is needed. Web analytics is to analyze the behavior by analyzing Web logs which web users have left you visit the site. To estimate the behavior they want to request information of the analyzed Web user aims to provide a Web service, the Web service further continued improvement. There are several types that include among them Google Analytics offering a variety of analysis items for free and all over the world, many people are already using. This study introduces a Google Analytics web analytics focused and proposes a service improvement plan with specific web user segmentation analyzes the cases of Korea Democracy Foundation of Open Archives introduces them to the actual institutions. 기록정보서비스는 이용자들의 행태를 관찰하고 그들의 정보요구를 파악하여 그에 맞는 기록정보에 연결하고 안내해주는 적극적인 행위이다. 그러나 국내 기록정보서비스에 대한 연구는 이용자를 세분화하여 개인화된 서비스를 제공해야 한다는 당위성을인정하지만 구체적인 사례나 방안에 대해서는 논의되지 않고 있다. 웹의 대중화와 알 권리의 확산으로 웹기록정보서비스의 중요성이 대두되고 있지만, 현재 우리나라 대부분의 기록관리기관에서는 실무 현장에서의 인식이 부족하고 인력과 예산의 불충분으로 웹로그분석을 실시하지 못하고 있다. 그래서 기관의 기록정보서비스 담당자의 업무 효율성을 높여주면서 예산이 부족한 기관에서 활용될 수 있는 분석 도구의 도입이 필요하다. 웹애널리틱스는 사이트에 방문한 웹이용자가 남긴 웹로그를분석하여 행태를 분석하는 것이다. 그 종류에는 여러 가지가 있는데 그 중에서도 구글애널리틱스는 무료로 다양한 분석 항목을제공하고 있어 전 세계 많은 인구가 이미 사용하고 있다. 본 연구에서는 구글애널리틱스를 중심으로 웹애널리틱스를 소개하고 이를 실제 기관에 도입한 민주화운동기념사업회 사료관의 사례를 분석하여 구체적인 웹이용자 세분화와 서비스 개선 방안을 제시하고자 한다.

유해화학물질 취급 중소사업장을 대상으로 한 맞춤형 교육 효과에 관한 연구

이효은,김민규,이봉우 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.6

Chemical accidents are increasing day by day as the industry develops. To prevent such chemical accidents, Korea enacted the Chemicals Control Act. Through these laws, systematic management of chemical substances began. There are various positions in the companies. hazardous chemical supervisors, equipment and technical human, operators and employees. Chemicals-related education for each position should be provided. As a result of the survey, hazardous chemical supervisors and equipment and technical human liked the overall content of the Chemicals Control Act and the education subject on safety management standards for facilities. Conversely, the operators liked the course on how to wear personal protective equipment. The employees preferred subjects such as classification of chemical substances and prevention of chemical accidents. Currently, various modular textbooks are widely available. Rather than general education, it is necessary to select and provide customized subjects that are preferred and interested according to the position. Then it will be more effective in understanding harzardous chemical substances and in preventing chemical accidents.

2014년 봄철 대전지역 대기 중 수용성 입자상 유기탄소의 거동 특성 파악

이효은,김도연,오상협,최성호,정진상 한국대기환경학회 2015 한국대기환경학회 학술대회논문집 Vol.2015 No.11

알츠하이머 진단용 Glassy Carbon 및 스크린 프린트형 바이오 센서의 제작

이효은,최성호,이소라 한국공업화학회 2012 한국공업화학회 연구논문 초록집 Vol.2012 No.1

주요국의 변혁적 연구 추진현황과 시사점 분석

이효은 한국기술혁신학회 2020 한국기술혁신학회 학술대회 발표논문집 Vol.2020 No.11

Clinical Significance of Repetitive Compound Muscle Action Potentials in Patients with Myasthenia Gravis: A Predictor for Cholinergic Side Effects of Acetylcholinesterase Inhibitors

이효은,김율희,김승민,신하영 대한신경과학회 2016 Journal of Clinical Neurology Vol.12 No.4

Background and Purpose Acetylcholinesterase inhibitors (AChEIs) are widely used to treat myasthenia gravis (MG). Although AChEIs are usually tolerated well, some MG patients suffer from side effects. Furthermore, a small proportion of MG patients show cholinergic hy-persensitivity and cannot tolerate AChEIs. Because repetitive compound muscle action poten¬tials (R-CMAPs) are an electrophysiologic feature of cholinergic neuromuscular hyperactivi¬ty, we investigated the clinical characteristics of MG patients with R-CMAPs to identify their clinical usefulness in therapeutic decision-making. Methods We retrospectively reviewed the clinical records and electrodiagnostic findings of MG patients who underwent electrodiagnostic studies and diagnostic neostigmine testing (NT). Results Among 71 MG patients, 9 could not tolerate oral pyridostigmine bromide (PB) and 17 experienced side effects of PB. R-CMAPs developed in 24 patients after NT. The high¬est daily dose of PB was lower in the patients with R-CMAPs (240 mg/day vs. 480 mg/day, p<0.001). The frequencies of PB intolerance and side effects were higher in the patients with R-CMAPs than in those without R-CMAPs [37.5% vs. 0% (p<0.001) and 45.8% vs. 12.8% (p=0.002), respectively]. The MG Foundation of America postintervention status did not dif¬fer significantly between MG patients with and without R-CMAPs, and the response to im¬munotherapy was also good in both groups. Conclusions Side effects of and intolerance to AChEIs are more common in MG patients with R-CMAPs than in those without R-CMAPs. AChEIs should be used carefully in MG pa¬tients with R-CMAPs. The presence of R-CMAPs after NT may be a good indicator of the risks of PB side effects and intolerance.

경추 추간판 탈출증 환자 88례에 대한 임상적 고찰

이효은,조재희,문자영,임명장,강인,이한,정호석,장형석 대한침구의학회 2008 대한침구의학회지 Vol.25 No.6

Objectives : This study is to survey the effectiveness of the oriental medicine treatment on cervical disc herniation. Methods : The clinical study was done on 88 cases of patients with cervical disc herniation diagnosed by M.R.I, symptoms and physical test who admitted in Ja-seng Oriental Medicine Hospital from January 2006 to March 2008. After treatment, the efficacy was evaluated according to the criteria of Robinson et al. Results : The clinical results were satisfactory as excellent in cases, good in cases, fair in cases, 92.05% of all were improved above good state Conclusions : Oriental medicine treatment is effective on the recovery of cervical disc heniation.

일측성 뇌내출혈 이후 양측성 파킨슨 증상의 호전

이효은,권용욱,박혜영,조필자,고임석,이종윤 대한신경과학회 2010 대한신경과학회지 Vol.28 No.2

청소년 연령에서의 볼거리 뇌수막염 유행

이효은,곡진진,최은혜,김존수 대한소아신경학회 2017 대한소아신경학회지 Vol.25 No.4

Purpose: We report sharp rise of incidence of mumps meningitis at our institute and describe the clinical manifestations, laboratory findings, and complications. Methods: This is a retrospective study involving 34 patients with mumps meningitis at Eulji University Hospital from July 2012 to June 2014. They were diagnosed by definite parotid gland swelling and leukocytosis in cerebrospinal fluid (CSF) study. Results: Nineteen (55.9%) of the 34 patients with mumps meningitis were confirmed as positive by the mumps virus-specific immunoglobulin M (IgM) antibody in serum or CSF and the remaining 15 patients (44.1%) were classified as probable cases. We identified 31 boys and 3 girls clearly showing male predominance. The median age of the patients was 15.8 years and all patients were in the middle school and high school age group. Sixteen patients (47.1%) had unilateral mumps and 29 patients (85.3%) were diagnosed with meningitis after parotid swelling. Six patients (17.6%) were accompanied by testicular involvement and one (2.9%) showed hearing loss. The positivity of mumps virus specific IgM was 17 of 34 (50.0%) in serum and 4 of 34 (11.8%) in CSF. The total duration of illness including hospitalization was 5 to 21 days, median being 11 days. There was no serious neurologic deficit but 5 of 34 (14.7%) complained dizziness after discharge. It caused delay in back-to-work. Conclusion: It is worthy to notice that recent outbreak of mumps among adolescents are more complicated. We need to be more aggressive about prevention of mumps outbreak which bring on substantial socioeconomic loss. 목적: 최근 대전지역에서 집단 발생한 청소년 연령에서의 볼거리뇌수막염에 대한 임상적 특징을 분석하고자 한다. 방법: 2012년 7월부터 2014년 6월까지 을지대학교병원에서 볼거리뇌수막염으로 진단받은 34명을 대상으로 의무기록을 후향적으로 조사하였다. 볼거리 감염환자와의 접촉, 뚜렷한 이하선 부종 및 혈청 또는 뇌척수액에서 볼거리 바이러스 특이 IgM 항체 유무, 그리고 뇌척수액내 백혈구 증가증 여부에 따라 진단하였다. 결과: 31명이 남자였고 3명이 여자로 남성 우세를 분명히 나타내었다. 환자의 중간 연령은 15.8세였고 모든 환자는 중학교 및 고등학교연령 그룹에 속하였다. 16명(47.1%)에서 일측성 유행성 이하선염이 있었고, 29명(85.3%)은 이하선 부종이후 뇌수막염으로 진단하였다. 모든 환자는 발열, 두통, 구역 또는 구토의 수막 자극 징후가 확인되었다. 6명(17.6%)은 고환염이 동반되었으며, 1명(2.9%)은 청력 소실이 발생하였다. 볼거리 바이러스 특이 IgM의 양성율은 혈청에서 총 34명중 17명(50.0%)이었으며, 뇌척수액에서는 34명 중 4명(11.8%)이었다. 입원기간을 포함한 질병의 총 지속 기간은 5일에서 21일이며 중앙값은 11일이었다. 중대한 신경학적 손상은 없었으나 퇴원 후 34명 중 5 명(14.7%)이 현기증을 호소하였고, 이로 인해 일상생활의 복귀가 지연되었다. 결론: 청소년 연령에서 발생한 최근의 볼거리 대유행은 좀 더 합병증이 동반되었다는 사실은 주목할 만하다. 상당한 사회경제적 손실을유발하는 볼거리 대유행에 대한 적극적인 예방이 필요할 것으로 사료된다.