Design and Implementation of Symbol Detector for MIMO Spatial Multiplexing Systems

Yunho Jung,Seongjoo Lee,Young-Ha Lee,Youn Ok Park,Jaeseok Kim 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

In this paper, we propose an efficient symbol detection algorithm for multiple-input multiple-output spatial multiplexing (MIMO-SM) systems and present its design and implementation results. By enhancing the performance of the first detected symbol which causes error propagation, the proposed algorithm achieves a considerable performance gain as compared to the conventional sorted QR decomposition (SQRD) based detection and the ordered successive detection (OSD) algorithms. The implementation results show that the proposed algorithm can be implemented without increasing the hardware costs significantly.

Diode Laser—Can It Replace the Electrical Current Used in Endoscopic Submucosal Dissection?

Yunho Jung,Gwang Ho Baik,Weon Jin Ko,Bong Min Ko,Seong Hwan Kim,Jin Seok Jang,Jae-Young Jang,Wan-Sik Lee,Young Kwan Cho,Sun Gyo Lim,Hee Seok Moon,In Kyung Yoo,Joo Young Cho 대한소화기내시경학회 2021 Clinical Endoscopy Vol.54 No.4

Background/Aims: A new medical fiber-guided diode laser system (FDLS) is expected to offer high-precision cutting withsimultaneous hemostasis. Thus, this study aimed to evaluate the feasibility of using the 1,940-nm FDLS to perform endoscopicsubmucosal dissection (ESD) in the gastrointestinal tract of an animal model. Methods: In this prospective animal pilot study, gastric and colorectal ESD using the FDLS was performed in ex vivo and in vivoporcine models. The completeness of en bloc resection, the procedure time, intraprocedural bleeding, histological injuries to themuscularis propria (MP) layer, and perforation were assessed. Results: The en bloc resection and perforation rates in the ex vivo study were 100% (10/10) and 10% (1/10), respectively; those inthe in vivo study were 100% (4/4) and 0% for gastric ESD and 100% (4/4) and 25% (1/4) for rectal ESD, respectively. Deep MP layerinjuries tended to occur more frequently in the rectal than in the gastric ESD cases, and no intraprocedural bleeding occurred ineither group. Conclusions: The 1,940-nm FDLS was capable of yielding high en bloc resection rates without intraprocedural bleeding duringgastric and colorectal ESD in animal models.

Safety of Gastrointestinal Endoscopy in Korea: A Nationwide Survey and Population-Based Study

Yunho Jung,Jung Wook Kim,Jong Pil Im,Yu Kyung Cho,Tae Hee Lee,Jae-Young Jang 대한의학회 2022 Journal of Korean medical science Vol.37 No.4

Background: Attention should be paid to endoscopy-related complications and safety-related accidents that may occur in the endoscopy unit. This study investigated the current status of complications associated with diagnostic and therapeutic endoscopy in Korea. Methods: A questionnaire survey on endoscopy-related complications was conducted in a total of 50 tertiary or general hospitals in Korea. The results were compared to the population-level claims data from the Health Insurance Review & Assessment Service (HIRA), which analyzed endoscopy procedures conducted in 2017 in Korea. Results: The incidences of bleeding associated with diagnostic and therapeutic esophagogastroduodenoscopy (EGD) and with diagnostic and therapeutic colonoscopy were 0.224% and 3.155% and 0.198% and 0.356%, respectively, in the 2017 HIRA claims data, compared to 0.012% and 1.857%, and 0.024% and 0.717%, in the 50 hospitals surveyed. The incidences of perforation associated with diagnostic and therapeutic EGD and with diagnostic and therapeutic colonoscopy were 0.023% and 0.613%, and 0.007% and 0.013%, respectively, in the 2017 HIRA claims data compared to 0.001% and 0.325%, and 0.017% and 0.206%, in the 50 hospitals surveyed. In the HIRA claims data, the incidence of bleeding/perforation after diagnostic colonoscopy in clinics, community hospitals, general hospitals, and tertiary hospitals was 0.129%/0.000%, 0.088%/0.004%, 0.262%/0.009%, and 0.479%/0.030% respectively, and the corresponding incidence of bleeding/perforation after therapeutic colonoscopy was 0.258%/0.004%, 0.401%/0.007%, 0.408%/0.024%, and 0.731%/0.055%. Conclusion: The incidences of complications associated with diagnostic and therapeutic EGD or colonoscopy tended to increase with the hospital volume in Korea.

Area-efficient Radix-3<SUP>2</SUP> FFT Processor for Hand Gesture Recognition Radar

Yongchul Jung,Jaechan Cho,Seongjoo Lee,Yunho Jung 대한전자공학회 2019 Journal of semiconductor technology and science Vol.19 No.3

We propose an area-efficient fast Fourier transform (FFT) processor for hand gesture recognition (HGR) radar and present its hardware design and implementation results. To estimate finger motion, the FFT processor should support at least 600~720-point operation for three-channel input data streams. Hence, we propose three-channel 729-point FFT processor based on the radix-3<SUP>2 </SUP>algorithm and a multipath delay commutator (MDC) pipeline architecture, which minimizes the number of nontrivial multiplications. Moreover, the FFT processor was designed using hardware description language (HDL) and synthesized to gate-level circuits using a standard cell library for 65 nm CMOS process. The proposed architecture results in a logic gate count of 219 K with die size of 0.81mm2 and required memory of 18 KB, which can be suitable for compact HGR radar, as it has a smaller area than similar processors.

고속 멀티미디어 통신시스템을 위한 효율적인 FFT 알고리즘 및 하드웨어 구현

정윤호(Yunho Jung),김재석(Jaeseok Kim) 大韓電子工學會 2004 電子工學會論文誌-SD (Semiconductor and devices) Vol.41 No.3

An intracellular antifreeze protein from an Antarctic microalga that responds to various environmental stresses

Gwak, Yunho,Jung, Woongsic,Lee, Yew,Kim, Ji Sook,Kim, Chul Geun,Ju, Ji-Hyun,Song, Chihong,Hyun, Jae-Kyung,Jin, EonSeon The Federation of American Societies for Experimen 2014 The FASEB Journal Vol.28 No.11

<P>The structure and function of the Antarctic marine diatom <I>Chaetoceros neogracile</I> antifreeze protein (Cn-AFP), as well as its expression levels and characteristics of the ice-binding site, were analyzed in the present study. <I>In silico</I> analysis revealed that the <I>Cn-AFP</I> promoter contains both light- and temperature-responsive elements. Northern and Western blot analyses demonstrated that both Cn-AFP transcript and protein expression were strongly and rapidly stimulated by freezing, as well as temperature and high light stress. Immunogold labeling revealed that Cn-AFP is preferentially localized to the intracellular space near the chloroplast membrane. Recombinant Cn-AFP had clear antifreeze activity. Protein-folding simulation was used to predict the putative ice-binding sites in Cn-AFP, and site-directed mutagenesis of the Cn-AFP b-face confirmed their identification.—Gwak, Y., Jung, W., Lee, Y., Kim, J. S., Kim, C. G., Ju, J.-H., Song, C., Hyun, J.-K., Jin, E. An intracellular antifreeze protein from an Antarctic microalga that responds to various environmental stresses.</P>

Design of Low Complexity LDPC Encoder for IEEE 802.11n WLAN Systems

Yongmin Jung,Yunho Jung,Jaeseok Kim 대한전자공학회 2008 ICEIC:International Conference on Electronics, Inf Vol.1 No.1

This paper proposes a low complexity hardware architecture of low-density parity-check (LDPC) encoder for IEEE 802.11n Wireless LAN (WLAN) systems. The proposed LDPC encoder is implemented with the two stage pipelined structure which is based on a quasi-cyclic (QC) LDPC encoding scheme with a dual diagonal matrix. To reduce the implementation complexity, the matrix multiplications are replaced by the logarithmic shift operations and the vector additions. Implementation results show that the proposed architecture reduces the required memory size by 25% and the number of the required logic gate by 20% over the wellknown Richardson’s encoding. The processing delay is also reduced by 10-23 clocks as the coding rates and the codeword block lengths.

Low-complexity multi-way and reconfigurable cyclic shift network of QC-LDPC decoder for Wi-Fi/WIMAX applications

Yongmin Jung,Yunho Jung,Seongjoo Lee,Jaeseok Kim IEEE 2013 IEEE transactions on consumer electronics Vol.59 No.3

<P>This paper proposes a cyclic shift decomposition (CSD) algorithm to perform multi-way cyclic shifts with low complexity in the quasi-cyclic low-density parity-check (QCLDPC) decoder. The proposed algorithm decomposes the cyclic shift into a common cyclic shift and a private cyclic shift. Based on the proposed CSD algorithm, a low-complexity multi-way and reconfigurable cyclic shift network (CSN) for QC-LDPC codes is proposed. The proposed CSN is composed of the shared component, which performs the common cyclic shift, and the repeated component, which performs the private cyclic shift. Each component can support reconfigurability for given QCLDPC codes. By introducing the single-path shared component, only the complexity of the multi-path repeated component increases linearly as the number of multi-way paths increases. A complexity analysis of each component is also proposed. Based on the complexity analysis, the proposed CSN can perform multi-way and reconfigurable cyclic shifts with low complexity in the QC-LDPC decoder. The implementation results show that the areas of the proposed four-way CSN are 0.227 mm<SUP>2</SUP> and 0.276 mm2 for the IEEE 802.11n/ac and IEEE 802.16e QC-LDPC codes, respectively, with 130 nm CMOS technology. The area saving per each-way is from 13.8% to 86.5% compared with previously presented works.</P>

Design and Implementation of Efficient Symbol Detector for MIMO Spatial Multiplexing Systems

정윤호(Yunho Jung) 대한전자공학회 2008 電子工學會論文誌-SD (Semiconductor and devices) Vol.45 No.10

본 논문에서는 다중 입출력 (MIMO) 공간다중화 (spatial multiplelxing, SM) 시스템을 위한 효율적인 심볼 검출 알고리즘이 제안되고, 이의 최적 설계 및 구현 결과가 제시된다. 에러 전파 (error propagation)을 야기하는 첫 검출 심볼의 검출 성능을 개선시킴으로써, 제안된 알고리즘은 기존의 정렬된 QR 분해 (sorted QR decomposition, SQRD) 기반 알고리즘이나 정렬된 순차적 검출 (ordered successive detection, OSD) 알고리즘에 비해 큰 성능 이득을 얻을 수 있다. 4개의 송수신 안테나를 갖는 16QAM MIMO-SM 시스템에 대한 성능 평가 결과, 제안된 알고리즘은 기존 알고리즘에 비해 10?³의 BER에서 약 2.5-13.5 ㏈의 성능 이득을 얻음을 확인하였다. 제안된 알고리즘은 하드웨어 설계 언어를 이용하여 설계 되었고, 0.18um CMOS 표준 셀 공정 라이브러리를 이용하여 합성 및 구현되었다. 구현결과, 제안된 알고리즘은 하드웨어의 큰 증가없이 구현 가능함을 확인할 수 있었다. In this paper, we propose an efficient symbol detection algorithm for multiple-input multiple-output spatial multiplexing (MIMO-SM) systems and present its design and implementation results. By enhancing the performance of the first detected symbol which causes error propagation, the proposed algorithm achieves a considerable performance gain as compared to the conventional sorted QR decomposition (SQRD) based detection and the ordered successive detection (OSD) algorithms. The bit error rate (BER) performance of the proposed detection algorithm is evaluated by the simulation. In case of 16QAM MIMO-SM system with 4 transmit and 4 receive (4x4) antennas, at BER=10?³ the proposed algorithm obtains the gain improvement of about 2.5-13.5 ㏈ over the conventional algorithms. The proposed detection algorithm was designed in a hardware description language (HDL) and synthesized to gate-level circuits using 0.18um 1.8V CMOS standard cell library. The results show that the proposed algorithm can be implemented without increasing the hardware costs significantly.

자동차 휠 베어링의 설계 자동화 프로세스 개발

정연호(Yunho Jung),김완태(Wantae Kim),양창환(ChangHwan Yang),정승기(SeungKi Chung),서승호(SeungHo Seo) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5