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미소량의 Fe<sub>2</sub>O<sub>3</sub>를 첨가시킨 혼합 알칼리 Silicate 유리들의 MAS-NMR 연구
강명진,심문식,Kang, Myoung-Jin,Shim, Moon-Sik 한국안광학회 1996 한국안광학회지 Vol.1 No.1
The mixed alkali silicate glasses doped 0.1 mol% $Fe_2O_3$ are fabricated for studying the effect of transition metal oxides, which is related to the $Li^-$ ion movement in Magic-Angle-Spinning NMR. We have investigated the spin-lattice relaxation times in the room temperature and measured the $^7Li$ MAS-NMR spectrum with temperature. When the $Fe_2O_3$ oxides are added in alkali silicate glasses, the width of spectrum is changed a little but the line shape is hardly varied. For this reason, we can think that the mixed alkali effects are shown sufficiently in the spin-spin relaxation processes. However, it is not mixed alkali effects in this case. The activation energy of $Li^-$ ions are diminished in mixed alkali glasses. From the analysis of $Li^-$ diffusion environment, spin-lattice relaxation time and the nuclear magnetization, it is confirmed that the alkali mixed effects are not shown in $^7Li$ spin-lattice relaxation processes.
에지 클라우드 협동 이미지 처리기반 메타버스에서 스트리밍 가능한 저전력 AI 소프트웨어의 런타임 실행
강명진,김호,박정원,양승범,윤준서,박대진,Kang, Myeongjin,Kim, Ho,Park, Jungwon,Yang, Seongbeom,Yun, Junseo,Park, Daejin 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.11
As the interest in the 4th industrial revolution and metaverse increases, metaverse with multi edge structure is proposed and noted. Metaverse is a structure that can create digital doctor-like system through a large amount of image processing and data transmission in a multi edge system. Since metaverse application requires calculating performance, which can reconstruct 3-D space, edge hardware's insufficient calculating performance has been a problem. To provide streamable AI software in runtime, image processing, and data transmission, which is edge's loads, needs to be lightweight. Also lightweight at the edge leads to power consumption reduction of the entire metaverse application system. In this paper, we propose collaborative edge-cloud image processing with remote image processing method and Region of Interest (ROI) to overcome edge's power performance and build streamable and runtime executable AI software. The proposed structure was implemented using a PC and an embedded board, and the reduction of time, power, and network communications were verified.
머신러닝을 활용한 도시쇠퇴 예측모형 개발 - 인구변화율을 중심으로 -
강명진,김용선,윤현식 전남대학교 지역개발연구소 2024 지역개발연구 Vol.56 No.3
Urban decline refers to the stagnation of a region caused by population outflow, reduced business activity, and aging infrastructure. Despite substantial investments by the South Korean government, effective solutions remain elusive. This study employs machine learning techniques to develop an urban decline prediction model centered on population change rates, a critical indicator of urban decline. Among the models tested, Gradient Boosting achieved the highest performance with a Recall value of 0.92. The analysis identified three primary drivers of population loss and urban decline: employment and industry-related factors such as the proportion of manufacturing employment, housing and residential environment conditions, and social welfare-related variables. Manufacturing was found to play a pivotal role in predicting urban decline, yet its influence has been underexplored in prior research. Rather than solely focusing on fertility rates and birth incentives, this study highlights the importance of industrial restructuring, improved housing conditions, and raising social awareness to promote urban regeneration. The findings provide actionable insights for policymakers to efficiently allocate resources and implement effective urban revitalization initiatives.
사회부과적 완벽주의가 학업적 지연행동에 미치는 영향: 성실성의 조절효과
강명진,금명자 한국청소년학회 2023 청소년학연구 Vol.30 No.6
본 연구는 사회부과적 완벽주의와 학업적 지연행동의 관계에서 성실성의 조절효과를 알아보는데 목적이 있다. 이를 위해 이를 위해 대구, 경북 및 수도권에 위치한 대학교의 재학생 448명(남학생 215, 여학생 233)의 자료를 수집, 분석하여 다음과 같은 결과를 얻었다. 학업적 지연행동에 대해 사회부과적 완벽주의는 정적상관이, 성실성은 부적상관이 있었다. 본 연구의 목적대로 성실성은 사회부과적 완벽주의와 학업적 지연행동의 관계에서 조절효과가 있었다. 이는 사회적으로 부과된 완벽주의로 학업적 지연행동이 나타나더라도 성실성이 높은 사람은 이를 통제할 수 있음을 보여준다. 논의에서는 연구 결과를 바탕으로 학업적 지연행동을 보이는 대학생 상담에서 성실성을 강화시킬 수 있는 상담전략에 대한 제안과 연구의 제한점 등을 다루었다.
QR 코드로 인코딩된 소프트웨어 실행 제어 흐름 전력 소비 패턴 기반 시스템 이상 동작 감지
강명진,박대진,Kang, Myeong-jin,Park, Daejin 한국정보통신학회 2021 한국정보통신학회논문지 Vol.25 No.11
As embedded system are used widely and variously, multi-edge system, which multiple edges gather and perform complex operations together, is actively operating. In a multi-edge system, it often occurs that an abnormal operation at one edge is transferred to another edge or the entire system goes down. It is necessary to determine and control edge anomalies in order to prevent system down, but this can be a heavy burden on the resource-limited edge. As a solution to this, we use power consumption data to check the state of the edge device and transmit it based on a QRcode to check and control errors at the server. The architecture proposed in this paper is implemented using 'chip-whisperer' to measure the power consumption of the edge and 'Raspberry Pi 3' to implement the server. As a result, the proposed architecture server showed successful data transmission and error determination without additional load appearing at the edge.
강명진,최종철,권희진,윤성국,조진한,차재관,허재택,최순섭 대한영상의학회 2009 대한영상의학회지 Vol.61 No.2
Purpose: To assess the utility cerebral perfusion MR in the identification of changes in the findings before and after a stent-assisted angioplasty in cases of severe symptomatic carotid stenosis. Materials and Methods: Twenty-three patients with symptomatic high grade ICA stenosis underwent cerebral perfusion MR imaging before and after carotid stent placement. The time to peak (⊿TTP) and cerebral blood volume (%CBV) were retrospectively calculated before and after stenting in each hemisphere, as well as between the vascular enhancing group and non-vascular enhancing group on contrast-enhanced T1-weighted images before stenting. As well, the prestent ⊿TTP was compared with the stenosis degree for each case. Results: The value of ⊿TTP decreased significantly after stenting, while the difference of the prestent ⊿TTP between the vascular enhancing group and non-vascular enhancing group was also statistically significant (p<0.05). However, no significant differences or changes in %CBV were identified after stenting both between the vascular and non-vascular enhancing group and for the degree of carotid stenosis. The value of ⊿TTP before stenting was positively correlated (r=0.472) to the degree of carotid stenosis (p<0.05). Conclusion: The MR perfusion supports improved perfusion status of the brain after a stent-assisted angioplasty in cases of severe carotid stenosis. 목적: 증상이 있는 심한 경동맥 협착에서 스텐트 시술 전과 후에 시행한 자기공명뇌관류영상의 소견과 변화를 알고자 하였다. 대상과 방법: 증상이 있는 경동맥 협착 환자로 스텐트 시술 전후에 자기공명뇌관류영상을 시행한 23명의 환자를 대상으로 하였다. 스텐트 시술 전후 ⊿TTP(time to peak)와 %CBV (cerebral blood volume)를 비교하였고, 조영증강 T1 강조영상에서 혈관상 조영증강 군과 조영증강이 보이지 않는 군 사이의 스텐트 시술 전 ⊿TTP와 %CBV를 후향적으로 구하였다. 또한, 각 예마다 협착 정도와 스텐트 시술 전 ⊿TTP를 비교하였다. 결과: 스텐트 시술 후 ⊿TTP는 의미 있게 감소하였고 혈관상 조영증강이 보이는 군과 그렇지 않은 군 사이에 스텐트 시술 전 ⊿TTP는 통계적으로 의미 있게 차이가 있었다(p < 0.05). 그러나 %CBV는 스텐트 전후 혹은 두 군 사이에 변화나 차이는 없었으며, 협착 정도와도 통계적 연관성은 없었다. 스텐트 시술 전 ⊿TTP는 협착 정도와 통계적으로 양의 상관관계(r=0.472)가 있었다(p < 0.05). 결론: 심한 경동맥 협착에서 자기공명뇌관류영상은 스텐트 시술 후 나아진 뇌 관류상태를 보여줄 수 있다.