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Song, Changhoon,Yun, Junyeong,Keum, Kayeon,Jeong, Yu Ra,Park, Heun,Lee, Hanchan,Lee, Geumbee,Oh, Seung Yun,Ha, Jeong Sook Elsevier 2019 Carbon Vol.144 No.-
<P><B>Abstract</B></P> <P>We report a fabrication of a high-performance wire-type supercapacitor through surface modification of carbon fiber with ionic liquid, nanomaterials, and gel electrolyte containing ionic liquid. Coating of Au nanoparticles onto carbon fiber increases both surface area and electrical conductivity. Dip-coating of mixture of ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]), carbon nanotubes, and electropolymerization of polypyrrole (Ppy) onto Au coated fiber for pseudocapacitance results in high capacitance. The use of propylene carbonate-poly(methyl methacrylate)-[EMIM][TFSI] gel electrolyte gives high operation voltage. Such wire-type supercapacitor exhibits a high voltage of 2.5 V, an areal capacitance of 38.49 mF cm<SUP>−2</SUP>, and a maximum energy and power density of 24.7 μWh cm<SUP>−2</SUP> and 3.52 mW cm<SUP>−2</SUP>, respectively. In addition, the cyclic stability of the supercapacitor is dramatically enhanced by using 2-naphthalene sulfonic acid as a dopant in electropolymerization of Ppy. Encapsulation with a thermally shrinkable tube endows the supercapacitor with mechanical stability and waterproof features when it is bent, folded, twisted, even in water. This work demonstrates high potential of such wire-type supercapacitor as a flexible energy-storage device for various applications, especially those that require high voltage.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Model soot이 Pt/CeO₂ 촉매와 tight contact한 상태에서의 O₂에 의한 산화특성 연구
송창훈(Changhoon Song),이동일(Dongil Lee),김태수(Taesoo Kim),송순호(Soonho Song),전광민(Kwang Min Chun) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
The catalytic behaviors of Pt/CeO₂ have been studied for soot oxidation by O₂. Oxidation of soot (carbon black) is studied using a flow reactor system simulating the condition of diesel exhaust. In this study, the temperature programmed oxidation (TPO) scheme is used. And soot oxidation rate is evaluated by monitoring both CO and CO₂ concentrations. Pt/CeO₂ catalyst shows promising performance to accelerate the soot-O₂ reaction. Under tight contact condition with catalyst, soot oxidation reaction occurred more actively. The maximum soot oxidation temperature is decreased by about 150℃. The main reason that causes the increase of soot oxidation activity is the active oxygen from cerium oxide.
소형 디젤 엔진용 배기 재순환용 전자식 밸브에 관한 연구
송창훈(Changhoon Song),이민호(Minho Lee),정용일(Yongil Jeong),차경옥(Kyungok Cha) 한국자동차공학회 2003 한국 자동차공학회논문집 Vol.11 No.4
The exhaust gas recirculation (EGR) is needed for one of various strategies to reduce NOx emission. But to get the proper EGR rate, the intake and exhaust system become complicated, also application of EGR system is difficult because of the penalty in fuel consumption and the increase in particulate matter.<br/> This study is focused on the development of EGR valve using the electrical method, The effects of EGR on the characteristics of NOx, CO, CO2 emissions and particulate mater have been investigated using small-displacement size 0.8-liters engine of diesel passenger car operating at several loads and speeds. After the analysis and comparison between conventional E-EGR valve and developed E-EGR valve performance by test bench. the estimation of vehicle application was executed through the EGR map and CVS-75 test result measured on the chassis dynamometer.
대형 디젤 엔진의 연비 향상을 위한 Miller Cam 평가
송창훈(Changhoon Song),왕태중(Tae Joong Wang),임희준(Heejun Im) 한국자동차공학회 2016 한국 자동차공학회논문집 Vol.24 No.1
Miller timing is one of the promising ways which can improve the fuel consumption of internal combustion engines. Indeed, Miller timing employing an early intake valve close is widely applied to large diesel and gas engines to enhance performance and reduce NOx emissions. In this study, performance evaluation is carried out by 1-D cycle simulation in order to estimate the effect of Miller CAM timing before BDC for a 32 L turbocharged diesel engine. To optimize Miller CAM timing, a single stage turbocharger is matched with an early intake valve close since boost pressure is a significant parameter that can control compression work in a turbocharged engine. The engine simulation result shows that there is enough potential to improve fuel consumption rate and also reduce NOx emissions at the same time.
Endobronchial suction catheter guided nasotracheal intubation with preformed nasotracheal tube
Jia Song,Taehee Pyeon,Daehoon Kim,Changhoon Lee,Joungmin Kim 조선대학교 의학연구원 2020 Medical Bilogical Science and Engineering Vol.3 No.1
Nasotracheal intubation is commonly used in surgery requiring space of the orofacial field. The endotracheal tube used for nasotracheal intubation is either a conventional tube or a preformed nasotracheal tube considering nasal passage. Conventional nasotracheal intubation starts with blind passage of an endotracheal tube via the nostril followed by laryngoscopy-assisted intubation through the vocal cord with or without the aid of Magill forceps. During intubation, anesthesiologists may experience interruption of endotracheal tube passage because of resistance in nasal cavity. It is known that any excessive force may significantly increase the risk of damage to nasal structures. One way to prevent this damage is Guided-technique. Guided technique is easier, cheaper and safer than conventional technique. Here we report a case of successful endotracheal intubation with preformed nasotracheal tube following endobronchial suction catheter guidance. Guided technique with endobronchial suction catheter is useful for nasotracheal intubation with preformed nasotracheal intubation tube.
Recovery-Key Attacks against TMN-family Framework for Mobile Wireless Networks
( Tran Song Dat Phuc ),( Yong-hyeon Shin ),( Changhoon Lee ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.6
The proliferation of the Internet of Things (IoT) technologies and applications, especially the rapid rise in the use of mobile devices, from individuals to organizations, has led to the fundamental role of secure wireless networks in all aspects of services that presented with many opportunities and challenges. To ensure the CIA (confidentiality, integrity and accessibility) security model of the networks security and high efficiency of performance results in various resource-constrained applications and environments of the IoT platform, DDO-(data-driven operation) based constructions have been introduced as a primitive design that meet the demand of high speed encryption systems. Among of them, the TMN-family ciphers which were proposed by Tuan P.M., Do Thi B., etc., in 2016, are entirely suitable approaches for various communication applications of wireless mobile networks (WMNs) and advanced wireless sensor networks (WSNs) with high flexibility, applicability and mobility shown in two different algorithm selections, TMN64 and TMN128. The two ciphers provide strong security against known cryptanalysis, such as linear attacks and differential attacks. In this study, we demonstrate new probability results on the security of the two TMN construction versions - TMN64 and TMN128, by proposing efficient related-key recovery attacks. The high probability characteristics (DCs) are constructed under the related-key differential properties on a full number of function rounds of TMN64 and TMN128, as 10-rounds and 12-rounds, respectively. Hence, the amplified boomerang attacks can be applied to break these two ciphers with appropriate complexity of data and time consumptions. The work is expected to be extended and improved with the latest BCT technique for better cryptanalytic results in further research.
Rekeying Approach against Side Channel Attacks
( Tran Song Dat Phuc ),( Byoungjin Seok ),( Changhoon Lee ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.1
Side-channel attacks and in particular differential power analysis (DPA) attacks pose a serious threat to cryptographic implementations. One approach to counteract such attacks is cryptographic schemes based on fresh re-keying. In settings of pre-shared secret keys, such schemes render DPA attacks infeasible by deriving session keys and by ensuring that the attacker cannot collect side-channel leakage on the session key during cryptographic operations with different inputs. This paper present a study on rekeying approach against side channel attacks with current secure schemes and their rekeying functions.