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Taegyu Lee,Junhyung Kim,정운혁,Taehee Jo,Sangwoo Park,Jaehoon Choi 대한수부외과학회 2023 대한수부외과학회지 Vol.28 No.3
Purpose: Infected malleolar bursitis sometimes requires multiple debridements, followed by soft tissue reconstruction with a flap. The purpose of this study was to evaluate the clinical outcomes of patients with infected lateral malleolar bursitis who were treated using peroneal artery perforator-based propeller flaps. Methods: We retrospectively included 10 patients who underwent reconstruction of the lateral malleolus with a peroneal artery perforator-based propeller flap due to infected lateral malleolar bursitis between 2014 and 2022. Results: The average follow-up time was 77.2 weeks. Six patients experienced complete healing; three developed partial flap necrosis, and one had a long-lasting seroma. All patients with complications had long-term diabetes. Conclusion: Partial flap necrosis in patients with diabetes may occur because of impaired microcirculation. A peroneal artery perforator-based propeller flap could be useful for soft tissue reconstruction in select patients without diabetes or in patients with diabetes who have infected lateral malleolar bursitis.
Periodic Biometric Information Collection Interface Method for Wearable Vulnerable Users
Taegyu Lee 한국인터넷방송통신학회 2021 Journal of Advanced Smart Convergence Vol.10 No.3
Recently, wearable computers equipped with various biosensors such as smart watches, smart bands, and smart patches that support daily health management of users as well as patients have been released. Users of wearable computers such as smart watches face various difficulties in performing biometric information processes such as data sensing, collection, transmission, real-time analysis, and feedback in a weak wireless and mobile biometric information service environment. In particular, the biometric information collection interface is an important basic process that determines the quality and performance of the entire biometric information service. So far, research has focused on sensing hardware and logic. This study intensively considers the interface method for effectively sensing and collecting raw biometric information. In particular, the process of collecting biometric information is designed and analyzed from the perspective of periodicity. Therefore, we propose an efficient and stable periodic collection method.
Lee, Chung Jun,Lee, Dae Hoon,Kim, Taegyu American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.4
<P>This paper describes modification of catalyst surface from interaction between catalysts and dielectric barrier discharge (DBD) plasma. Ru/gamma-Al2O3 catalyst was exposed to DBD plasma for CO2 methanation and CH4 direct conversion reactions. Parameters related to the modification of catalyst surface were investigated by SEM and EDS analysis.</P>
Lee, Chung Jun,Lee, Dae Hoon,Kim, Taegyu American Scientific Publishers 2018 Journal of Nanoscience and Nanotechnology Vol.18 No.2
<P>This paper describes the performance degradation of impregnated catalyst in the dielectric barrier discharge (DBD) plasma-assisted methane conversion process. Mn and Ni mixed copper-zinc catalysts, and bare gamma-Al2O3 support were exposed to the DBD plasma generated at 1 kHz and 9 kV under CH4 direct conversion for 4 hours. The performance degradation due to the surface damage of the catalyst by the plasma was investigated by SEM analysis.</P>
Scalable Multiband Binaural Renderer for MPEG-H 3D Audio
Taegyu Lee,Hyun Oh Oh,Jeongil Seo,Young-Cheol Park,Dae Hee Youn IEEE 2015 IEEE journal of selected topics in signal processi Vol.9 No.5
<P>To provide immersive 3D multimedia service, MPEG has launched MPEG-H, ISO/IEC 23008, “High Efficiency Coding and Media Delivery in Heterogeneous Environments.” As part of the audio, MPEG-H 3D Audio has been standardized based on a multichannel loudspeaker configuration (e.g., 22.2). Binaural rendering is a key application of 3D audio; however, previous studies focus on binaural rendering with low complexity such as IIR filter design for HRTF or pre-/post-processing to solve in-head localization or front-back confusion. In this paper, a new binaural rendering algorithm is proposed to support the large number of input channel signals and provide high-quality in terms of timbre, parts of this algorithm were adopted into the MPEG-H 3D Audio. The proposed algorithm truncates binaural room impulse response at mixing time, the transition point from the early-reflections to the late reverberation part. Each part is processed independently by variable order filtering in frequency domain (VOFF) and parametric late reverberation filtering (PLF), respectively. Further, a QMF domain tapped delay line (QTDL) is proposed to reduce complexity in the high-frequency band, based on human auditory perception and codec characteristics. In the proposed algorithm, a scalability scheme is adopted to cover a wide range of applications by adjusting the threshold of mixing time. Experimental results show that the proposed algorithm is able to provide the audio quality of a binaural rendered signal using full-length binaural room impulse responses. A scalability test also shows that the proposed scalability scheme smoothly compromises between audio quality and computational complexity.</P>
Stereo upmix-based binaural auralization for mobile devices
Taegyu Lee,Yonghyun Baek,Young-cheol Park,Dae Youn IEEE 2014 IEEE transactions on consumer electronics Vol.60 No.3
<P>This paper presents a new binaural auralization algorithm suitable for mobile devices. A stereo-tomultichannel virtual upmix technique was utilized to expand the spatial dimension of stereo audio to a multichannel speaker space. In order to enhance subjective preferences and listener envelopment, reflections of the primary sound component were artificially generated by modeling a virtual ceiling and sidewalls based on concert hall acoustics. The uncorrelated ambient components were then distributed over spatial points at different azimuth and elevation angles. Computational efficiency was achieved by removing the redundant operations in each stage of the algorithm. Subjective tests were performed, and the results showed that the proposed algorithm significantly improves spatial perceptions of stereo audio being played over headphones.</P>
Periodic Biometric Information Collection Interface Method for Wearable Vulnerable Users
Lee, Taegyu The Institute of Internet 2021 International journal of advanced smart convergenc Vol.10 No.3
Recently, wearable computers equipped with various biosensors such as smart watches, smart bands, and smart patches that support daily health management of users as well as patients have been released. Users of wearable computers such as smart watches face various difficulties in performing biometric information processes such as data sensing, collection, transmission, real-time analysis, and feedback in a weak wireless and mobile biometric information service environment. In particular, the biometric information collection interface is an important basic process that determines the quality and performance of the entire biometric information service. So far, research has focused on sensing hardware and logic. This study intensively considers the interface method for effectively sensing and collecting raw biometric information. In particular, the process of collecting biometric information is designed and analyzed from the perspective of periodicity. Therefore, we propose an efficient and stable periodic collection method.
이태규(Lee TaeGyu),김혜욱(Kim HyeUk) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
When water inside the concrete member evaporates by high temperature, the evaporation heat which absorbs surrounding temperature occurs. The rate of increment of the internal temperature in concrete is reduced due to the evaporation heat in spite of continuously increasing external temperature. In this paper, the prediction method of internal temperature of high strength concrete members considering the evaporation heat under the high temperature is presented. Finite element method is employed to facilitate thermal analysis for any position of member. And the thermal characteristics models of high strength concrete affected by high temperature are proposed. To demonstrate the validity of this numerical procedure, the prediction by the proposed algorithm is compared with the test results of other researchers. The proposed algorithm shows a good agreement with the experimental results including the phenomenon that temperature is lost by the evaporation heat.
IoT를 적용한 태양열시스템 유지관리 및 고장진단 방안
최태규(Taegyu Choi),이두영(Doo Young Lee),조성구(Sung-Goo Cho),홍희기(Hiki Hong) 대한설비공학회 2019 대한설비공학회 학술발표대회논문집 Vol.2019 No.-
Typical trouble patterns in solar thermal systems include heat transfer medium leakage and pump failure. The purpose of this study was to demonstrate the way Lee and Hong diagnose pump failure and heat transfer medium leakage. And introduce how IoT technology used in solar thermal system for maintenance and Failure diagnosis. Pump failure can be diagnosed by XOR with pump and flow switch signal. Heat transfer medium leakage can be diagnosed by self-manufactured fluid sensor. And fluid sensor was destroyed during experiments. It was chance to enhance stability of fluid sensor. With IoT technology, when failure happens solar controller can send pop up message to user’s smart device. And service center also get that message so they can handle it. Also, service center has server. So they can get all data from every solar thermal system. It helps service center to maintain its solar thermal system easily.