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Low-temperature synthesis of LiFePO <sub>4 </sub> nanocrystals by solvothermal route
Lim, Jinsub,Kang, Sung-Won,Moon, Jieh,Kim, Sungjin,Park, Hyosun,Baboo, Joseph Paul,Kim, Jaekook Springer 2012 NANOSCALE RESEARCH LETTERS Vol.7 No.1
<P>LiFePO<SUB>4 </SUB>nanocrystals were synthesized at a very low temperature of 170°C using carbon nanoparticles by a solvothermal process in a polyol medium, namely diethylene glycol without any heat treatment as a post procedure. The powder X-ray diffraction pattern of the LiFePO<SUB>4 </SUB>was indexed well to a pure orthorhombic system of olivine structure (space group: Pnma) with no undesirable impurities. The LiFePO<SUB>4 </SUB>nanocrystals synthesized at low temperature exhibited mono-dispersed and carbon-mixed plate-type LiFePO<SUB>4 </SUB>nanoparticles with average length, width, and thickness of approximately 100 to 300 nm, 100 to 200 nm, and 50 nm, respectively. It also appeared to reveal considerably enhanced electrochemical properties when compared to those of pristine LiFePO<SUB>4</SUB>. These observed results clearly indicate the effect of carbon in improving the reactivity and synthesis of LiFePO<SUB>4 </SUB>nanoparticles at a significantly lower temperature.</P>
IP Studio Infrastructure intended for Modern Production and TV broadcasting Facilities
Joseph Mfitumukiza,Vinayagam Mariappan,Minwoo Lee,Seungyoun Lee,Junghoon Lee,Juyoung Lee,Yunsik Lim,Jaesang Cha 한국인터넷방송통신학회 2016 Journal of Advanced Smart Convergence Vol.5 No.3
In the TV broadcasting, movie production and business the transportation of video between creators (programmers, studios) and distributors (broadcast and cable networks, cable and satellites companies) is still a mix of File Transfer Protocol (FTP), physical delivery, and expensive multicast satellite. Cloud-based file sync-and-share providers like Dropbox and box are playing an increasing role, but the industry’s unique demands for speed and multicasting have fueled the growth of IP Video transport. This paper gives a solid grasp of the major elements of IP video technology, including content preparation, system architecture alternatives and network performance management.
Characterizing Viscoelastic Property of Soft Tissue Over the Hip as a Risk Factor of Pressure Ulcer
Kitaek Lim,Seung-su Kim,Woochol Joseph Choi 한국전문물리치료학회 2021 한국전문물리치료학회지 Vol.28 No.1
Background: A pressure ulcer is common in soft tissue over the greater trochanter (GT) in side-lying position, and sustained tissue deformation induced by the prolonged external force is a primary cause, which can be discussed with soft tissues’ viscoelastic properties (i.e., stress relaxation, creep response). Objects: Using an automated hand-held indentation device, we measured the viscoelastic properties of soft tissue over the hip area, in order to examine how the properties are affected by site with respect to the GT. Methods: Twenty participants (15 males and 5 females) who aged from 21 to 32 were participated. An automated hand-held indentation device was used to measure the stress relaxation time and creep response. Trials were acquired for three different locations with respect to the GT (i.e., right over the GT, 6 cm anterior or posterior to the GT). For each location, five trials were acquired and averaged for data analyses. Results: Soft tissues’ stress relaxation time and creep response were associated with site (F = 23.98, p < 0.005; F = 24.09, p < 0.005; respectively). The stress relaxation time was greatest at posterior gluteal region (19.22 ± 2.49 ms), and followed by anterior region (15.39 ± 2.47 ms) and right over the GT (14.40 ± 3.18 ms). Similarly, creep response was greatest at posterior gluteal region (1.16 ± 0.14), and followed by anterior region (0.95 ± 0.14) and right over the GT (0.89 ± 0.18). Conclusion: Our results showed that the stress relaxation and creep were greatest at the posterior gluteal region and least at right over the GT, indicating that the gluteal soft tissue is more protective to the prolonged external force, when compared to the trochanteric soft tissue. The results suggest that a risk of pressure ulcer over the GT may decrease with slightly posteriorly rotated side-lying position.
Kitaek Lim,Woochol Joseph Choi 한국전문물리치료학회 2021 한국전문물리치료학회지 Vol.28 No.2
Background: Only 2% of falls in older adults result in serious injuries (i.e., hip fracture). Therefore, it is important to differentiate injurious versus non-injurious falls, which is critical to develop effective interventions for injury prevention. Objects: The purpose of this study was to a. extract the best features of surface electromy-ography (sEMG) for classification of injurious falls, and b. find a best model provided by data mining techniques using the extracted features.Methods: Twenty young adults self-initiated falls and landed sideways. Falling trials were consisted of three initial fall directions (forward, sideways, or backward) and three knee po-sitions at the time of hip impact (the impacting-side knee contacted the other knee (“knee together”) or the mat (“knee on mat”), or neither the other knee nor the mat was contacted by the impacting-side knee (“free knee”). Falls involved “backward initial fall direction” or “free knee” were defined as “injurious falls” as suggested from previous studies. Nine features were extracted from sEMG signals of four hip muscles during a fall, including integral of absolute value (IAV), Wilson amplitude (WAMP), zero crossing (ZC), number of turns (NT), mean of am-plitude (MA), root mean square (RMS), average amplitude change (AAC), difference absolute standard deviation value (DASDV). The decision tree and support vector machine (SVM) were used to classify the injurious falls. Results: For the initial fall direction, accuracy of the best model (SVM with a DASDV) was 48%. For the knee position, accuracy of the best model (SVM with an AAC) was 49%. Further-more, there was no model that has sensitivity and specificity of 80% or greater.Conclusion: Our results suggest that the classification model built upon the sEMG features of the four hip muscles are not effective to classify injurious falls. Future studies should con-sider other data mining techniques with different muscles.
Park, Joseph,Yang, Jaemoon,Lim, Eun‐,Kyung,Kim, Eunjung,Choi, Jihye,Ryu, Joo Kyung,Kim, Nam Hee,Suh, Jin‐,Suck,Yook, Jong In,Huh, Yong‐,Min,Haam, Seungjoo WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.4
<P><B>Aktivierbare Nanosonde</B>: Eine neu entwickelte Nanosonde zeigt Membran‐Typ‐1‐Matrixmetalloproteinase(MT1‐MMP)‐Aktivität durch einen Anstieg der Signalintensitäten in Fluoreszenzbildgebung (FI) und Kernspintomographie (MRI) an. MNCs=magnetische Nanokristalle, Q=Löscheinheit, F=Fluoreszenzfarbstoff.</P>
정면 모의충돌시험에서 운전자 흉부가속도 유형에 따른 조향핸들과의 흉부접촉에 대한 연구
김요셉(Joseph Kim),임경호(Kyung-ho Lim),범현균(Hyen-kyun Beom),권성은(Sung-eun Kwon) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The increasing number of vehicles has given rise to frequent traffic accidents. The safety become one of the most important factor for customers to purchase a car. To meet customers' needs, NCAP(New Car Assessment Program) test is performed in many country such as US, Korea, and Europe. EuroNCAP performance becomes important to Korean car makers as the number of exporting vehicle to Europe market increases. The assessment of EuroNCAP frontal crash test includes the criteria of dummy injuries, vehicle measurements of deformation and the subjective modifier. Among the subjective modifier. the Chest Contact Modifier is one of the most ambiguous modifier because of difficulties in getting sufficient clues. In this paper, sled test was carried out using KNCAP full frontal crash pulse to analyze shape patterns of chest acceleration pulse which is one of the information of chest contact modifier. The test result was showed that four patterns of obscure pulse shape in vehicle crash test were categorized and these pulse patterns were clearly revealed to be occurring chest contact or not.