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Lee Jaehyeon,Kim So Yeon,Huh Hee Jae,Kim Namsu,Sung Heungsup,Lee Hyukmin,Roh Kyoung Ho,Kim Taek Soo,Hong Ki Ho 대한진단검사의학회 2021 Annals of Laboratory Medicine Vol.41 No.6
The rapid antigen test (RAT) for coronavirus disease (COVID-19) represents a potent diagnostic method in situations of limited molecular testing resources. However, considerable performance variance has been reported with the RAT. We evaluated the clinical performance of Standard Q COVID-19 RAT (SQ-RAT; SD Biosensor, Suwon, Korea), the first RAT approved by the Korean Ministry of Food and Drug Safety. In total, 680 nasopharyngeal swabs previously tested using real-time reverse-transcription PCR (rRT-PCR) were retested using SQ-RAT. The clinical sensitivity of SQ-RAT relative to that of rRT-PCR was 28.7% for all specimens and was 81.4% for specimens with RNA-dependent RNA polymerase gene (RdRp) threshold cycle (Ct) values ≤23.37, which is the limit of detection of SQ-RAT. The specificity was 100%. The clinical sensitivity of SQ-RAT for COVID-19 diagnosis was assessed based on the Ct distribution at diagnosis of 33,294 COVID-19 cases in Korea extracted from the laboratory surveillance system of Korean Society for Laboratory Medicine. The clinical sensitivity of SQ-RAT for COVID-19 diagnosis in the Korean population was 41.8%. Considering the molecular testing capacity in Korea, use of the RAT for COVID-19 diagnosis appears to be limited.
Namsu Kim,Jaehyeon Lee,조지현,Hye Soo Lee 대한임상검사정도관리협회 2019 Journal of Laboratory Medicine And Quality Assuran Vol.41 No.2
Background: Clinical microbiological tests are conducted at night, on weekends, and during public holidays in various manners due to the fact that both manual processes and the form of working type, are not well known. Therefore, we surveyed the current running condition of these laboratories and made some suggestions for better-quality clinical microbiology tests. Methods: We conducted a survey, both online and offline, focusing on the operating styles of clinical microbiological tests within laboratories that had participated in an external quality assessment program, conducted by the Korean Association of External Quality Assessment Service (KEQAS). Results: Out of 341 laboratories that participated in the microbiology program of KEQAS, 128 replied to our questionnaires. In Korea, various types of operations occur within clinical microbiology laboratories. Those in night duty operate in either shifts or dedicated duties. In the case of weekend shifts, they either operated on single-day schedules (either on a Saturday or a Sunday), or over the entire weekend. For public holidays, the laboratories operated in various manners, depending on the number of days off. Among the clinical microbiological tests conducted at night, on weekends, and during public holidays, Gram staining and inoculations are the most common tasks carried out, with some laboratories conducting antibiotic susceptibility tests as well. Conclusions: Rapid reporting of clinical microbiological test results is currently inadequate due to both cost and labor constraints, despite its many advantages. It would be ultimately beneficial for both the patient and the hospital to switch to a 24/7 operating schedule through the utilization of a variety of methods, including cost control, coordination of a fine workforce, and prioritization of tests needing to be reported.
Lee, Sungho,Ahn, Youngho,Kim, Taemin,Kim, Namsu,Lee, Sungchul IEEE 2018 IEEE SENSORS JOURNAL Vol.18 No.22
<P>Monitoring and analysis of power consumption are critical in terms of energy management, especially when managing the energy of factories with high energy consumption equipment. Hall sensors can be used for monitoring the power consumption. In this paper, we propose a novel superpositioning method for use with the three-phase current lines of an electrical switchboard, to improve the accuracy of current sensing by distinguishing the wanted magnetic field from magnetic interference. The relationship between magnetic interference and the magnetic field which we are trying to measure was investigated quantitatively by using numerical simulations as well as an experimental measurement. We subsequently designed a CMOS system-on-chip for use with magnetic Hall sensors, for practical validation of the proposed method. With this technique, measurement errors were less than ±0.8 %, based on experiments conducted with 50 A flowing through a three-phase current switchboard.</P>
Lee, Younghun,Lee, Sungho,Zhao, Xing Guan,Lee, Dongoh,Kim, Taemin,Jung, Hoeryong,Kim, Namsu Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.2
In the last decade, there has been an exponential increase of scientific interest in smart additive manufacturing (AM) technology. Among the different AM techniques, one of the most commonly applied processes is digital light processing (DLP). DLP uses a digital projector screen to flash an ultraviolet light which cures photopolymer resins. The resin is cured to form a solid to produce parts with precise high dimensional accuracy. During the curing process, there are several process parameters that need to be optimized. Among these, the exposure time affects the quality of the 3D printed specimen such as mechanical strength and dimensional accuracy. This study examines optimal exposure times and their impact on printed part. It was found that there is optimal exposure time for printed part to have appropriate mechanical strength and accurate dimensions. The gel fraction and TGA test results confirmed that the improvement of mechanical properties with the increasing UV exposure time was due to the increase of crosslinked network formation with UV exposure time in acrylic resins. In addition, gel fraction and thermogravimetric analysis were employed to microscopically investigate how this process parameter impacts mechanical performance.
I/O 성능 및 형평성 향상을 위한 가상화 인지 디스크 파티셔닝 기법
이남수(Namsu Lee),강동우(Dongwoo Kang),김세욱(Sewoog Kim),최종무(Jongmoo Choi),김준모(Junmo Kim) 한국정보과학회 2012 정보과학회논문지 : 시스템 및 이론 Vol.39 No.6
가상화는 게스트라고 불리는 다중 가상 머신이 하나의 호스트 머신에서 동시적으로 수행할 수 있도록 하기위하여 물리적 자원을 다중 논리적 자원으로 추상화하는 기술이다. XEN에서 가상 하드 디스크를 지원하는 방법은 파일, 개별 파티션 및 실제 디스크와 같이 세 가지 방법이 있다. 가장 공통적으로 채택되는 방식은 하나의 디스크를 다중 파티션으로 나누고 각각의 파티션을 가상 하드디스크로서 각각의 가상 머신에 할당하는 파티션-기반 방식이다. 이러한 방식은 하드 디스크 기록 방식의 물리적 특성 때문에 내부 실린더 상에 위치한 파티션의 성능이 외부 실린더 상에 위치한 파티션의 성능보다 낮아져서 성능편차가 발생한다는 문제점을 지닌다. 또한, 서로 다른 가상 머신에서 요청된 I/O 요청들 간의 긴 탐색 거리를 필요로 하기 때문에, 동시에 다중 가상머신이 동작할 때 동시적 I/O 성능을 감소시키는 잠재적 문제점을 갖고 있다. 우리는 이와 같은 성능 불균형과 성능 감소를 극복하기 위해서 Onion과 Pizza로 불리는 새로운 두 가지 파티션 구조를 제안한다. 우리는 XEN 4.1에서 Domain-0 용도로 사용되어지는 Linux kernel 2.6.32를 수정함으로써 우리의 제안을 구현하였다. 성능평가 결과, Original의 파티션 구조와 비교 하였을 때, Pizza 구조는 가상 머신간의 공평성을 높이는 성능 결과를 보였으며 Onion 구조는 공평성을 개선했을 뿐만 아니라, 임의 또는 순차적 I/O에 관계없이 동시적 I/O 성능을 개선함을 파악할 수 있었다. Virtualization is a technology that abstracts physical resources into multiple logical resources so that multiple virtual machines, also called as guests, can run concurrently in a single host machine. In XEN, there are three different ways to support a virtual hard disk; file, individual partition, and real disks. The most commonly adopted way is the partition-based one, that divides a single disk into multiple partitions and assigns each partition into each virtual machine as a virtual hard disk. One problem of this approach is that the partition located on inner-cylinders gives a unfairly worse performance than the partition on outer-cylinders due to the physical characteristics of the hard disk recording mechanism. Also, it has a potential to degrade concurrent I/O performance when multiple virtual machines run concurrently due to a long seek distance between the I/O requests requested from different virtual machine. To overcome the unfairness and performance degradation, we propose two novel partitioning schemes, called Onion and Pizza. We have implemented our proposals in the XEN 4.1 by modifying the Linux kernel 2.6.32 which is used for the Domain-0. Performance evaluation results have shown that the Pizza scheme can enhance fairness among virtual machines while the Onion scheme can improve not only fairness but also performance regardless of random or sequential I/O, compared with the original partitioning scheme.
Younghun Lee,Sungho Lee,Xing Guan Zhao,Dongoh Lee,Taemin Kim,정회룡,Namsu Kim 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.2
In the last decade, there has been an exponential increase of scientific interest in smart additive manufacturing (AM) technology. Among the different AM techniques, one of the most commonly applied processes is digital light processing (DLP). DLP uses a digital projector screen to flash an ultraviolet light which cures photopolymer resins. The resin is cured to form a solid to produce parts with precise high dimensional accuracy. During the curing process, there are several process parameters that need to be optimized. Among these, the exposure time affects the quality of the 3D printed specimen such as mechanical strength and dimensional accuracy. This study examines optimal exposure times and their impact on printed part. It was found that there is optimal exposure time for printed part to have appropriate mechanical strength and accurate dimensions. The gel fraction and TGA test results confirmed that the improvement of mechanical properties with the increasing UV exposure time was due to the increase of crosslinked network formation with UV exposure time in acrylic resins. In addition, gel fraction and thermogravimetric analysis were employed to microscopically investigate how this process parameter impacts mechanical performance.
[우수논문] Xen 가상화 환경을 위한 하드디스크 레이아웃 연구
이남수(Namsu Lee),강동우(Dongwoo Kang),김세욱(Sewoog Kim),최종무(Jongmoo Choi),김준모(Junmo Kim) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.1A
최근 클라우드 컴퓨팅의 핵심 기술로서 가상화 기술이 대두되고 있다. 가상화는 컴퓨터 자원의 물리적인 특징을 추상화하여 사용자에게는 논리적 자원을 제공하고 이를 통해 기술적 및 관리적 이점을 제공한다. Xen 가상화 환경에서 가상머신에 디스크 공간을 할당하는 한 가지 방식으로 하나의 하드디스크 파티션을 가상머신에 할당하는 방식이 있다. 위와 같은 환경에서는 같은 하드디스크에 존재하는 가상머신들임에도 불구하고 데이터에 접근하는 물리적 특성으로 인해 읽기/쓰기 성능 불균형이 발생하고, 가상머신의 수가 증가함에 따라 파티션 간의 최단 탐색거리 증가로 인해 동시적 읽기/쓰기의 성능이 저하되는 문제점이 발생한다. 본 논문은 이러한 문제점을 해결하기 위해 새로운 파티션 구조인 Onion 파티션 구조를 제안한다. Xen버전 4.1의 환경에서 Domain-0 커널버전 2.6.32를 수정하여 구현 및 실험을 하였다. 실험 결과, 각 가상머신의 독립적 읽기/쓰기 성능 편차가 기존대비 8%, 10%수준으로 개선되었으며, 가상머신들의 동시적 읽기/쓰기 성능은 기존대비 156.76%, 119.01%의 성능 향상을 보였다.