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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.
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.
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.
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.
정윤호(Yunho Jung),최태영(Taeyoung choe) 한국정보과학회 2006 한국정보과학회 학술발표논문집 Vol.33 No.1
나날이 발전하는 임베디드 시스템의 기술은 임베디드 시스템 간의 정보통신 시 보다 안전하고 효율적인 데이터 통신을 필요로 하고 있다. 이를 위해 임베디드 간의 통신 시 암호화 된 데이터 통신으로 보다 안전한 통신보안 시스템을 구축하고 있다. 하지만 임베디드 상에서 충분히 안전한 보안 시스템을 구축하기에는 다소 부하가 큰 것으로 알려져 있다. 따라서 임베디드 시스템에 알맞은 암호화 시스템을 구축하는 것이 필요하다. 본 논문에서는 PXA255 기반의 임베디드 보드에서 RSA/SHA1 암호화 시스템과 DH/RC4 암호화 시스템을 구현하고 그 성능을 평가하였다.