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환자 후송용 들것 고정끈 개량을 통한 후송준비시간 단축
임태환 ( Tae-hwan Lim ),김아랑 ( Ah-rang Kim ),장수영 ( Su-young Jang ),임진혁 ( Jin-hyuk Lim ),박광원 ( Gwang-won Park ) 국군의무사령부 2021 대한군진의학학술지 Vol.52 No.1
Objective; The military casualties should be packaged into litters safely and securely without delay. The aim of this study was to evaluate the physical properties of a new litter fixation strap with hook-and-loop fastener applied, and the degree of time reduction in patient packaging using the new strap. Method; A fixation strap was made of nylon with maximum tensile strength applied with a hook-and-loop fastener. Its physical properties such as tensile strength, shear strength, peel strength and anti-fouling capacity were evaluated by Korea Textile Inspection and Testing Institution. The patient packaging time was measured with a conventional standard strap and a new strap using an 80-kg dummy. The packaging time was measured three times each with 20 skilled and 20 unskilled soldiers. Result; The newly manufactured strap showed sufficient physical properties to be used as a litter fixation strap. The patient packaging time was strikingly reduced by at least 100 seconds even with unskilled soldiers. Conclusion; The new litter fixation strap with a hook-and-loop fastener applied can replace the current standard immobilization strap with significant packaging time reduction, which can result in improved survival of casualties in the battlefield.
사출성형법에 의해 제작된 Fe-2%Ni연자성 소결체의 소결 및 자기적 특성
임태환(Tae-Hwan Lim) 한국산학기술학회 2019 한국산학기술학회논문지 Vol.20 No.1
미립의 3종류 Fe-2%Ni합금 분말(N사), Fe+2%Ni혼합 분말(B사 및 S사)을 항절력 시험편 및 링(ring)형상의 시험편으로 사출 성형, 탈지, 소결 조건(환원 및 소결 분위기, 소결 온도, 소결시간, 냉각속도)을 변화시켜 소결체를 제작하였다. 얻어진 소결체에 대하여는 소결체의 밀도 및 자기적 특성을 평가하여 다음과 같은 결론을 얻었다. (1) 탈지한 각 성형체를 수소 중에서 1123K x 3.6ks유지하고, Ar중에서 1623K x 14.4ks로 소결할 경우 N(사), B(사), S(사)소결체의 밀도는 각각 96, 99, 99%로 나타났고, 소결체의 산소·탄소량은 각각 0.0041%O, 0.0006%C, 0.0027%O, 0.0022%C, 0.160%O, 0.0026%C의 값을 나타내었다. (2) 위에의 결과로부터 보면 B(사)의 소결체가 가장 우수한 결과를 나타내므로 B(사)의 Ar중 소결체에 대하여 자기적 특성을 조사한 결과, B25=14.3KG, Br=7.75KG, Hc=2.1Oe로 용해해서 만든 제품의 값에는 미치지 못했다. (3) B(사)의 성형체를 Ar가스 중에서 1673K x14.4ks로 소결 후 1123K까지는 0.83Ks<SUP>-1</SUP>로 냉각하고 1123K부터 실온까지는 0.083Ks<SUP>-1</SUP>로 냉각한 소결체의 자기적 특성은 B25=14.8KG, Br=8.3KG, Hc=1.3Oe로 용해해서 만든 제품의 값과 거의 동일한 값을 얻었다. 이상, 소결 조건 제어(환원조건, 소결분위기, 소결온도, 소결시간) 및 냉각속도 제어를 통한 소결 공정으로 목적하는 연자성 재료 특성을 얻었다. 3 kinds of fine powder, Fe-2%Ni alloy powder(N Ltd.) and Fe+2%Ni mixed powder(B Ltd. and S Ltd.), were fabricated into sintered compacts of bending strength specimens and ring type specimens by metal injection molding, debinding and controlling sintering conditions (reduction and sintering atmospheres, sintering temperature, sintering time and cooling rates). Density and magnetic properties of the sintered compacts were evaluated with the following conclusions. (1) When each compact was hold at 1123K for 3.6ks in H2 and sintered at 1623K for 14.4ks in Ar, the density of N, B and S Ltd.′s sintered compacts were measured as 96, 99 and 99%, and oxygen/carbon contents were measured as 0.0041%O/0.0006%C, 0.0027%O/0.0022%C, and 0.160%O/0.0026%C, respectively. (2) Magnetic characteristics of B Ltd. compact in Ar with the best results showed B25=14.3KG, Br=7.75KG, and Hc=2.1Oe, but not enough as those made by melting process. (3) Magnetic properties of B Ltd. compact which were sintered at 1673K for 14.4ks in Ar gas, and cooled at 0.83Ks<SUP>-1</SUP> to 1123K and then cooled at 0.083Ks<SUP>-1</SUP> down to room temperature were measured as B25=14.8KG, Br=8.3KG, and Hc=1.3Oe, almost similar to those made by melting process. Objected soft magnetic materials properties were obtained through sintering process by controlling sintering conditions (reduction condition, sintering atmosphere, sintering temperature and sintering time) and cooling rates.
기계학습 기법을 이용한 AI 처방의사결정 지원 플랫폼 개발 연구
임태환 ( Tae-hwan Lim ),허준녕 ( Joonnyung Heo ),정혜민 ( Hye-min Jeong ),박삼수 ( Sam-soo Park ),구영환 ( Koo Young-hwan ) 국군의무사령부 2021 대한군진의학학술지 Vol.52 No.1
Objective; Development of Prescription AI decision support system with machine learning Method; An Android based mobile application was developed to provide the user the results from the statistical model we developed. Machine learning model to predict the consumption rate of medical resources was developed with Tensorflow. Result; The solution developed for this study can provide decision support for army medical officers by providing the frequency of prescription for the diagnosis. We can predict the demand for medical supply using the machine learning algorithm developed for this study. The prediction may be helpful in saving costs and meeting supply for demand. Conclusion; The application developed for this study may be not only helpful for increasing accuracy for the management of patients but also be resourceful for the physicians, especially for the first-year army officers or general physicians.
PolypyrroleIMWCNT-g-PSSA 복합체의 전기적 특성
임태환,오경화,Lim, Tae-Hwan,Oh, Kyung-Wha 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.1
Poly(styrene sulfonic acid) (PSSA) was grafted onto the surface of multiwall carbon nanotubes (MWCNTs) using radical polymerization to assist the dispersion of MWCNTs before the polymerization of pyrrole. MWCNT-g-PSSA exhibited a higher dispersity in an aqueous solution compared with conventionally used carboxylated MWCNTs (c-MWCNTs), therefore, this composite acts as an excellent template for the high polymerization yield ofPolypyrrole (PPy). The measured polymerization yield was 95.5%, and its value was higher than that of PPy/c-MWCNT (61.8%). Consequently, the conductivity of the PPyIMWCNT-g-PSSA composite reached 124 S/cm, and this value was also higher than that of the PPy/c-MWCNT composite (48 S/cm) or PPylMWCNT doped with PSSA (91 S/cm). p-Toluenesulfonic acid (TSA)IHCI was selected as an additional dopant mixture to improve the electrical properties of the composite. As a result, the conductivity value of the composite improved to approximately 152 S/cm. The electrochemical and thermal stability were evaluated by cyclic voltammetry and environmental stability testing. Overall, PPy/MWCNT-g-PSSA had good electrical and mechanical properties that are desired for materials of various electric devices.