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복합재 제동시스템의 NVH 악화 특성 저감을 위한 이상해결책 개발에 관한 연구
심재훈(Jaehun Shim),이중희(Jounghee Lee),신웅희(Unghee Shin),황세라(Sera Hwang),임원석(Wonseok Yim),고영은(Youngeun Ko),김병철(Byongcheol Kim),임동원(Dongwon Im),현은재(Eunjae Hyun),이재만(Jaeman Lee) 한국자동차공학회 2019 한국자동차공학회 학술대회 및 전시회 Vol.2019 No.11
A variety of composites materials such as chassis system and body structure are applied to car industry. However, it is very difficult to apply composite materials to brake system because of NVH problem of composite material. In this paper, we present new solution to improve it. To achieve this goal, we used development method such as RCA (Root Cause Analysis), PCA (Problem Chain Analysis) and CA (Contradiction Analysis). We could find main causes of NVH problem through RCA and define new relationships among main causes through PCA and CA. And we can find IFR (Ideal Final Result) through interaction between PCA and CA. Finally, we could get effective results to reduce NVH characteristics.
복합재 디스크의 온도 저감을 위한 열전도도 증대 및 유동구조 최적화에 관한 연구
심재훈(Jaehun Shim),이중희(Jounghee Lee),신웅희(Unghee Shin),황세라(Sera Hwang),임원석(Wonseok Yim),김병철(Byongcheol Kim),고영은(Youngeun Ko),임동원(Dongwon Im),현은재(Eunjae Hyun),이재만(Jaeman Lee) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
Composite material has excellent mechanical property and lightweight effect. Therefore, it has been recently applied to a variety of systems of automobile such as body and chassis structures. However, there is a disadvantage of thermal property due to low density and thermal capacity. Furthermore, it is very difficult to apply composite material to brake system. In this paper, we will propose a new composite brake to overcome these problems. First, we try to increase heat conductivity for effectiveness of heat emission. To do so, manufacturing method of composite material is newly developed. Second, we optimize structure of vent shape to improve the air flow. We improve heat conductivity up to 34% and get unique vent structure compared to the competitor. Finally, cooling performance of composite brake is improved up to 7%. These results will contribute to improve brake performance such as NVH problem.
JongIl Park,ShiHa Shim,Myeongmi Lee,YoungEun Jung,TaeWon Park,SeonHee Park,YongJin Im,JongChul Yang,YoungChul Chung,SangKeun Chung 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3
Objective-The purpose of this study is to examine the validity of primary screening tools for attention deficit hyperactivity disorder (ADHD) in a community-based sample of children using the Korean version of the Child Behavior Checklist (K-CBCL) and the Korean version of the ADHD Rating Scale (K-ARS). Methods-A large-scale community-based study for ADHD screening was conducted in the Jeollabuk province in the Republic of Korea. In 2010–2011, we surveyed a total of 49,088 first- and fourth-grade elementary school students. All of the participants in this study were assessed by the K-ARS-Parent version (K-ARS-P) and the K-ARS-Teacher version (K-ARS-T) as the primary screening instruments. The Diagnostic Interview Schedule for Children Version IV (DISC-IV) was used for confirming the diagnosis of ADHD. DISC-IV was administered to subjects who received top 10% scores in the K-ARS-P or K-ARS-T tests. Results-Of the 3,085 subjects who completed the DISC-IV, 1,215 were diagnosed as having ADHD. A reasonable level of sensitivity, specificity, and negative predictive value were obtained when the total K-ARS-P scores were ≥90th percentile. The positive predictive value and specificity increased significantly when the total K-ARS-P scores were ≥90th percentile, T scores were ≥60 in the attention problems of K-CBCL, and T scores were ≥63 in the total problems of K-CBCL Conclusion-These results suggested that the K-ARS-P could effectively serve as a primary screening tool to identify elementary school children with ADHD in the community. Also, there might be some increment in the effectiveness of K-ARS-P when combined with KCBCL-A and K-CBCL-T as a secondary screening tool.
김래영,주윤지,하은지,홍혜진,서채원,Youngeun Shim,이현지,Yejin Kim,Jae-Hyoung Cho,윤수정,In Kyoon Lyoo 한국뇌신경과학회 2024 Experimental Neurobiology Vol.33 No.2
Cognitive dysfunction, a significant complication of type 2 diabetes mellitus (T2DM), can potentially manifest even from the early stages of the disease. Despite evidence of global brain atrophy and related cognitive dysfunction in early-stage T2DM patients, specific regions vulnerable to these changes have not yet been identified. The study enrolled patients with T2DM of less than five years’ duration and without chronic complications (T2DM group, n=100) and demographically similar healthy controls (control group, n=50). High-resolution T1-weighted magnetic resonance imaging data were subjected to independent component analysis to identify structurally significant components indicative of morphometric networks. Within these networks, the groups’ gray matter volumes were compared, and distinctions in memory performance were assessed. In the T2DM group, the relationship between changes in gray matter volume within these networks and declines in memory performance was examined. Among the identified morphometric networks, the T2DM group exhibited reduced gray matter volumes in both the precuneus (Bonferronicorrected p=0.003) and insular-opercular (Bonferroni-corrected p=0.024) networks relative to the control group. Patients with T2DM demonstrated significantly lower memory performance than the control group (p=0.001). In the T2DM group, reductions in gray matter volume in both the precuneus (r=0.316, p=0.001) and insular-opercular (r=0.199, p=0.047) networks were correlated with diminished memory performance. Our findings indicate that structural alterations in the precuneus and insular-opercular networks, along with memory dysfunction, can manifest within the first 5 years following a diagnosis of T2DM.
Catalytic pyrolysis of waste printed circuit boards
( Hyunjin Kim ),( Jihyeon Seo ),( Haneul Shim ),( Youngeun Kang ),( Young-min Kim ),( Sumin Pyo ),( Young-kwon Park ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
Owing to the increased amount of electrical and electronic equipment, caused by the usage amount increase and further accelerated the exchange period of hardware, such as personal computer, smart phone, display equipment, and so on, the amount of electronic waste (e-waste) had been largely increased in recent decades. Printed circuit board (PCB) is a main component of electrical and electronic equipment and difficult to be recycled due to its harmful effect caused by the high halogen contents. In addition, the multilayer structure of PCB, consisted with additives, polymers, paper, and inorganics, makes it difficult to use the simple pyrolysis product as fuel or chemical feedstocks. Therefore, the catalytic pyrolysis was applied to increase the selectivity toward to the value-added products in this study. For the experiments, the tandem micro reactor-gas chromatography/mass spectrometry was used for the simple pyrolysis in the 1<sup>st</sup> furnace and sequential catalytic upgrading of pyrolysis products in the 2<sup>nd</sup> furnace. The product distribution produced at different temperature and by the use of different catalysts was analyzed and discussed to optimize the process operation for the chemical recycling of PCB. The obtained results suggested that the product oil quality can be increased by applying catalytic pyrolysis process increasing the yield of aromatic hydrocarbons with the decrease oxygen contents.
Changes in Structural Covariance among Olfactory-related Brain Regions in Anosmia Patients
이수지,송유미,홍혜진,주윤지,하은지,Youngeun Shim,홍승노,김정윤,In Kyoon Lyoo,윤수정,Dae Woo Kim 한국뇌신경과학회 2024 Experimental Neurobiology Vol.33 No.2
Anosmia, characterized by the loss of smell, is associated not only with dysfunction in the peripheral olfactory system but also with changes in several brain regions involved in olfactory processing. Specifically, the orbitofrontal cortex is recognized for its pivotal role in integrating olfactory information, engaging in bidirectional communication with the primary olfactory regions, including the olfactory cortex, amygdala, and entorhinal cortex. However, little is known about alterations in structural connections among these brain regions in patients with anosmia. In this study, highresolution T1-weighted images were obtained from participants. Utilizing the volumes of key brain regions implicated in olfactory function, we employed a structural covariance approach to investigate brain reorganization patterns in patients with anosmia (n=22) compared to healthy individuals (n=30). Our structural covariance analysis demonstrated diminished connectivity between the amygdala and entorhinal cortex, components of the primary olfactory network, in patients with anosmia compared to healthy individuals (z=-2.22, FDR-corrected p=0.039). Conversely, connectivity between the orbitofrontal cortex—a major region in the extended olfactory network—and amygdala was found to be enhanced in the anosmia group compared to healthy individuals (z=2.32, FDR-corrected p=0.039). However, the structural connections between the orbitofrontal cortex and entorhinal cortex did not differ significantly between the groups (z=0.04, FDR-corrected p=0.968). These findings suggest a potential structural reorganization, particularly of higher-order cortical regions, possibly as a compensatory effort to interpret the limited olfactory information available in individuals with olfactory loss.
Production of high-quality chemical materials through the catalytic pyrolysis of e-waste
( Hyunji Yim ),( Hoyeon Jang ),( Bo Sung Kang ),( Sugyeong Jeon ),( Haneul Shim ),( Youngeun Kang ),( Young-min Kim ),( Sumin Pyo ),( Young-kwon Park ) 한국폐기물자원순환학회 2022 ISSE 초록집 Vol.2022 No.-
With the recent development of electronic device manufacturing technology, the demand of electrical and electronic equipment has increased rapidly, and the amount of electronic waste (e-waste) is also increasing accordingly. Although the recycling of e-waste has increased, it is still limited as metal recovery and most of organic parts, polymers and additives, were still treated simply via incineration or landfill. Pyrolysis can be considered as an eco-friendly process not only for the effective recovery of metal but also for the chemical recycling of organic parts of e-wastes. In this research, the thermal and catalytic pyrolysis of e-wastes have investigated focused on the production of high-quality oil and chemical feedstock. The non-catalytic pyrolysis of organic part in e-waste was prepared after the elimination of inorganic part and applied the pyrolysis under inert gas atmosphere using thermogravimetric (TG) analyzer and pyrolyzer-gas chromatography/mass spectrometry (Py-GC/MS). Kinetic analysis, analyzed by a model free kinetic analysis method to the TG analysis results of organic e-waste, indicated the change of thermal degradation pattern by applying the catalytic pyrolysis. Py-GC/MS result also indicated the quality of the pyrolysis oil can be upgraded efficiently with the decrease of undesirable product, such as halogen containing chemicals and oxygen containing pyrolyzates.