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단순 코골이 또는 폐쇄성 수면 무호흡증이 있는 후기 남자 청소년에서 다면적 인성 검사 결과
유민지 ( Minji Yu ),남범우 ( Beomwoo Nam ),서정석 ( Seo Jeong Seok ),노수림 ( Soo Rim Noh ),이종국 ( Jonggook Lee ),이제정 ( Je Jung Lee ),서희영 ( Heeyoung Seo ),김태현 ( Taehyun Kim ),오근 ( Keun Oh ) 한국정신병리진단분류학회 2021 精神病理學 Vol.25 No.2
Objectives The purpose of this study was to quantitatively assess the degree of Simple Snoring(SS) or Obstructive Sleep Apnea (OSA) affecting mental health through the results of multiphasic military personality inventory. Method We collected and analyzed the results of the military personality inventory(MPI) for healthy controls and SS or OSA patients among the 19-year-old men who visited the Military Manpower Administration from January 2008 to January 2013. MPI invented for Korean military test has similar system to Minnesota multiphasic personality inventory. Results Among demographic data, education level was lower in SS or OSA group (χ2=69.49, p<0.001). Socio-economic status and parents-relationship were not statistically different between two groups (χ2=2.94, p=0.401; χ2=2.01, p=0.570). BMI was higher in SS or OSA group (t=-8.24, p<0.001). Among validity scale, the score of faking good subscale was lower in SS or OSA group (t=3.157, p=0.002). Each score of faking bad and infrequency subscale was higher in SS or OSA group (t=-3.741, p<0.001; t=-2.766, p=0.006). Among neurosis scale, each score of anxiety, depression, somatization and personality disorder subscale was higher in SS or OSA group, respectively (t=-4.060, p<0.001; t=-3.977, p<0.001; t=-4.293, p<0.001; t=-3.499, p=0.001). Among psychopath scale, each score of schizophrenia and paranoia subscales were not statistically different between two groups (t=-1.669, p=0.096; t=-2.012, p=0.045). Conclusion According to MPI results, we can confirm that SS or OSA patients may appear feature such as anxiety, depression, somatization and personality tendency (introversion or impulsivity) than the control group.
열팽창캡슐 적용을 통한 TPE경량화 효과에 따른 Dash Insulation Pad의 물성 변화
유민지(Minji Yu),김상민(Sangmin Kim),박장석(Jangseok Park) 한국자동차공학회 2021 한국 자동차공학회논문집 Vol.29 No.5
At present, fuel efficiency improvement technologies, such as lightweight materials, engine efficiency improvement, design modification, and eco-friendly car, are in progress due to the tightened international regulations. The research on lightweight materials for the improvement of engine efficiency is ongoing. Thermoexpandable microcapsules (TEMs) are one of the foaming technologies and composited of a core-shell structure with uniform increase in mechanical properties. In this study, we applied TEMs for lightweight development to the conventional TPE sheet of layers of dash insulation pad. We investigated the specific gravity, thickness, mechanical properties, acoustic properties, and pore size with 1, 3, and 5 wt% contents of TEMs. Specific gravity was reduced by 14 %, and thickness was increased by 13 % as compared with conventional TPE sheet. D/ISO PAD showed a 5 % lightweight effect. Even though the weight of the TPE sheet filled with TEMs was lighter than the TPE sheets, the acoustic properties were similar.
유민지(MinJi Yu),박장석(JangSeok Park) 한국자동차공학회 2021 한국자동차공학회 부문종합 학술대회 Vol.2021 No.6
엔진기술을 주도해왔던 내연기관 차에서 전기모터 차로 변경되면서 발생되는 자동차 주요 소음원이 변화하게 되었다. 기존 내연기관의 경우에는 엔진 연소음이 주요 소음원이었다. 전기차로 변화하면서 구동기관이 전기 모터로 변경되어 모터에서 발생되는 고주파대역 소음들이 주요 소음원으로 변경되었다. 이러한 소음 특성을 파악하여 전기차에 발생되는 고주파 소음 특성에 최적화된 흡/차음재 개발이 필요하다. 차음성능은 차음재의 면밀도와 비례하게 된다. 본 연구에서는 모터에서 발생하는 고주파 소음이 실내로 유입되는 것을 저감시키는 차음재를 두께 별로 물성 및 차음성능을 비교하였다. 비중계를 통하여 비중을 확인 한 후, 광학현미경을 통하여 TPO sheet의 단면을 확인하여 두께를 비교하였다. 차음성능은 APAMAT-Ⅱ를 통하여 시험하였다. UTM(Universal Testing Machine)을 통하여 기계적 물성을 파악하였다.