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비콘과 웨어러블 밴드 기반의 낙상 사고 알림 시스템 설계 및 구현
허한슬 ( Han-seul Heo ),고용국 ( Yong-guk Go ),심재훈 ( Jae-hoon Shim ),심효빈 ( Hyo-bin Shim ),양경석 ( Kyeong-seok Yang ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
사람들은 예측하지 못한 순간에 발생할 수 있는 안전 사고에 대해 항상 불안해한다. 매년 노년층 인구 비율이 증가함에 따라 낙상 사고 발생 빈도도 비례적으로 증가하고 있다. 낙상 사고는 대체로 골든 타임이 짧으므로 보호자와 함께 생활하지 않는 노인에게 낙상 사고가 발생한 경우 이를 대처하는 것은 매우 어렵다. 본 논문에서는 비콘과 웨어러블 밴드를 활용하여 낙상 사고 발생을 효과적으로 감지하고 초동 응급 대처가 가능할 수 있도록 돕는 알림 시스템을 설계하고, 이러한 기능을 수행하는 모바일 애플리케이션을 구현하고자 한다.
Koo, Ye-Seul,Ko, Dam-Seul,Jeong, Da-Woon,Shim, Jae-Hoon American Chemical Society 2017 Journal of agricultural and food chemistry Vol.65 No.11
<P>Cyclodextrins (CDs) are produced from starch by cyclodextrin glucanotransferase (CGTase), which has cyclization activity. Specifically, alpha-CD is an important biomolecule, as it is a molecular carrier and soluble dietary fiber used in the food industry. Upon inspection of the conserved regions of the glycoside hydrolase (GH) 13 family amylases, the amino acids K232 and H233 of CGTase were identified as playing an important role in enzyme reaction specificity. A novel CD hydrolyzing enzyme, cyclodextrin glycosyl transferase.(CGTase)-alpha, was developed using site-directed mutagenesis at these positions. Action pattern analysis using various substrates revealed that CGTase-alpha was able to hydrolyze beta- and gamma-CD, but not alpha-CD. This selective CD hydrolyzing property was employed to purify a alpha-CD from alpha-CD mixture solution. The alpha-CD that remained after treatment with CGTase-alpha and exotype glucoamylase was purified using hydrophobic interaction chromatography with 99% purity.</P>
Shim, Do-Sik,Baek, Gyeong-Yun,Lee, Seul-Bi,Yu, Jae-Hyun,Choi, Yoon-Suk,Park, Sang-Hu Elsevier 2017 Surface & coatings technology Vol.328 No.-
<P><B>Abstract</B></P> <P>This study focuses on post-deposition heat treatment for possible hardfacing of cold press dies using M4 high-speed tool steel. For the experimental investigations, using the direct energy deposition (DED) process, powdered AISI M4 (a high-speed tool steel) is deposited on a substrate of AISI D2 (a general-use die steel). Since the post-deposition heat treatment may change the metallurgical characteristics of the deposits, the effect of post-deposition heat treatment on the mechanical behavior was investigated by observing the microstructure evolution, hardness, wear behavior, and Charpy impact tests of the specimens with different post-deposition heat treatments. The experimental results showed that post-deposition quenching and tempering led to a reduction in hardness, which was attributed to the relieved residual stress, tempered martensite, and removal of carbon from the martensite during tempering. The M4-deposited specimen without post-deposition heat treatment and the tempered M4-deposited specimen had the better wear resistance, compared to the quenched–tempered M4-deposited specimen with fine carbides. Nevertheless, the toughness increased significantly in the quenched and tempered specimen. The results presented in this paper provide guidelines for practical hardfacing applications that use high-alloy tool steel powders to achieve highly improved die and mold performances in terms of wear resistance and toughness.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This study examined heat treatment of M4 tool steel coated by laser melting. </LI> <LI> The types and sizes of carbide particles have a great influence on wear resistance and impact toughness. </LI> <LI> The tempered specimen presented higher wear resistance than the quenched–tempered specimen. </LI> <LI> The total absorption energy of the quenched–tempered specimen was highest. </LI> </UL> </P>
Seul Jung,Kwang Ki Shim 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
This paper presents a case study of a class project for Junior level students in the curriculum of Mechatronics Engineering. As a class project of a sensor and signal processing class, a team of two students is required to build two line tracers, a master and a slave line tracer. The master line tracer is same as the line tracer that follows the line, but the slave line tracer is required to follow the master with limitation of sensors to follow the front master. The slave does not have communication with the master and any sensors to detect the line. The slave has only the distance sensor to detect the master. At the end of the semester, a master-slave line tracer competition is held to evaluate student grade for the class.