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심상효,정희태,송기민,김윤신,강용선,Sim, Sang-Hyo,Chung, Hee-Tae,Song, Ki-Min,Kim, Yoon-Shin,Kang, Yong-Seon 한국환경보건학회 2008 한국환경보건학회지 Vol.34 No.4
This paper aims to provide basic data for work environment control, prevention of worker exposure to asbestos and improvement of air quality to protect workers ‘health after measuring the level of airborne asbestos and workers' exposure in a shipbuilding repair businesses. For this study, a total of 27 samples were collected from 27 workers who had been exposed to asbestos during engine, piping, boiler and other manufacturing processes in 'A' Shipbuilding Repair Company in Gyeongnam. This research was conducted from Oct. 1 to 30, 2007 and had the following results: The target group (27 workers) consisted of all men with an average age of 35.9 years and 6.6 years of work on average. Among them, fifteen 15 (55.6%) were smokers. In terms of their duties at work, there were 12 plumbing repair engineers (44.4%), 8 boiler repair engineers (29.6%) and 7 engine engineers (25.9%). The geometric mean concentration of airborne asbestos was 0.004 f/cc. A total of 4 samples exceeded the exposure limit. In particular, three exceeded the legal limit by more than double, which means that some workers have been highly exposed to asbestos. In terms of the concentration of asbestos fibres by work process, plumbing repair was the highest (0.0071 f/cc($0.001{\sim}0.57\;f/cc$)) while boiler was the lowest (0.0015 f/cc($0.001{\sim}0.007\;f/cc$)). Based on this study, proper action needs to be taken as soon as possible to protect workers from the threat of asbestos.
UHF대역 RFID 수신단(리더)의 지터(비트동기) 및 글리치 제거회로 설계
김상훈,이용주,심재희,이용석,Kim, Sang-Hoon,Lee, Yong-Joo,Sim, Jae-Hee,Lee, Yong-Surk 한국통신학회 2007 韓國通信學會論文誌 Vol.32 No.1A
본 논문에서는 ISO/IEC 18000-6C 표준안을 만족하는 UHF대역 RFID 수신단(리더)의 지터(Jitter)처리와 글리치제거 알고리듬 및 설계방안을 제안하고 이를 이용한 리더를 구현하여 실제 TI(Texas instrument) Gen2 태그의 응답을 분석하였다. ISO/IEC 18000-6C표준안은 Reader에서 Tag로 데이터 전송 시 +/-1%의 오차와 Tag에서 Reader로 데이터 전송 시 최대 +/-22%의 오차를 허용하도록 정의하고 있다. 이러한 허용오차범위 내의 데이터에 대해 본 논문에서 제시한 회로는 기존의 PLL(DPLL, ADPLL)을 이용한 방식이 아닌 최대허용치(tolerance)와 허용치누적을 이용하여 일정치의 오차범위를 허용하며 디코딩 하도록 설계하였다. 또한 글리치와 지터제거 알고리듬의 기본원리를 동일하게 구성하여 글리치제거와 지터제거를 따로 구분하지 않고 하나의 기능으로 동작하게 한다. 주 클럭은 19.2MHz로 설정하였으며 LF는 국내 전파법에 맞도록 40kHz로 설정하였다 시뮬레이션결과 15%이하의 위상지터를 가진 입력데이터에 대해 판독에러율은 0이었으며 $15%{\sim}22%$ 위상지터를 가진 입력데이터에 대해서 는 0.000589였다. 그러나 동적LF생성회로를 사용한 결과 $15%{\sim}22%$ 위상변화를 가진 입력데이터에 대해 판독에러율은 0이었으며 표준안에 정의된 최대 +/-22%오차 범위내의 지터 발생에 대해서 판독에러율은 0이었다. In this paper, we propose an implementation and an algorithm of 'Jitter and Glitch Removing Circuit' for UHF RFID reader system based on ISO/IEC 18000-6C standard. We analyze the response of TI(Texas Instrument) Gen2 tag with a reader using the proposed algorithm. In ISO/IEC 18000-6C standard, a bit rate accuracy(tolerance) is up to +/-22% during tag-to-interrogator communication and +/-1% during interrogator-to-tag communication. In order to solve tolerance problems, we implement the Jitter and Glitch Removing Circuit using the concept of tolerance and tolerance-accumulation instead of PLL(DPLL, ADPLL). The main clock is 19.2MHz and the LF(Link Frequency) is determined as 40kHz to meet the local radio regulation in korea. As a result of simulations, the error-rate is zero within 15% tolerance of tag responses. And in the case of using the adaptive LF generation circuit, the error-rate varies from 0.000589 to zero between 15% and 22% tolerance of tag responses. In conclusion, the error-rate is zero between 0%-22% tolerance of tag response specified in ISO/IEC 18000-6C standard.
Sang Hun Lee,Myung Ho Jeong,Joon Ho Ahn,Dae Young Hyun,Kyung Hoon Cho,Min Chul Kim,Doo Sun Sim,Young Joon Hong,Ju Han Kim,Youngkeun Ahn,Jin Yong Hwang,Weon Kim,Jong Seon Park,Chang-Hwan Yoon,Seung Ho 대한내과학회 2022 The Korean Journal of Internal Medicine Vol.37 No.4
Background/Aims: Recurrent acute myocardial infarction (AMI) is an adverse cardiac event in patients with a first AMI. The predictors of recurrent AMI after the first AMI in patients who underwent successful percutaneous coronary intervention (PCI) have not been elucidated. Methods: We analyzed the data collected from 9,869 patients (63.2 ± 12.4 years, men:women = 7,446:2,423) who were enrolled in the Korea Acute Myocardial Infarction Registry-National Institute of Health between November 2011 and October 2015, had suffered their first AMI and had received successful PCI during the index hospitalization. Multivariable logistic regression analysis was performed to identify the independent predictors of recurrent AMI following the first AMI. Results: The cumulative incidence of recurrent AMI after successful PCI was 3.6% (359/9,869). According to the multivariable logistic regression analysis, the significant predictive factors for recurrent AMI were diabetes mellitus, renal dysfunction, atypical chest pain, and multivessel disease. Conclusions: In this Korean prospective cohort study, the independent predictors of recurrent AMI after successful PCI for the first AMI were diabetes mellitus, renal dysfunction, atypical chest pain, and multivessel disease.
Sim, Jinsook,Kim, Somin,Jang, Myungsu,Park, Minsuk,Oh, Hyunkyu,Ju, Sang-Yong American Chemical Society 2017 Langmuir Vol.33 No.41
<P>Symmetry breaking of single-walled carbon nanotubes (SWNTs) has profound effects on their optoelectronic properties that are essential for fundamental study and applications. Here, we show that isomeric SWNTs that exhibit identical photoluminescence (PL) undergo symmetry breaking by flavin mononucleotide (FMN) and exhibit dual PLs and different binding affinities (<I>K</I><SUB>a</SUB>). Increasing the FMN concentration leads to systematic PL shifts of SWNTs according to structural modality and handedness due to symmetry breaking. Density gradient ultracentrifugation using a FMN-SWNT dispersion displays PL shifts and different densities according to SWNT handedness. Using the optical titration method to determine the PL-based <I>K</I><SUB>a</SUB> of SWNTs against an achiral surfactant as a titrant, left- and right-handed SWNTs display two-step PL inflection corresponding to respective <I>K</I><SUB>a</SUB> values with FMN, which leads to the determination of the enantiomeric excess (ee) of the SWNT ensemble that was confirmed by circular dichroism measurement. Decreasing the FMN concentration for the SWNT dispersion leads to enantiomeric selection of SWNTs. The titration-based ee determination of the widely used sodium cholate-based SWNT dispersion was also demonstrated by using FMN as a cosurfactant.</P> [FIG OMISSION]</BR>
Yong-joo Lee,Sang-hoon Kim,Jae-hee Sim,Yong-surk Lee 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper we propose a new RFID (Radio Frequency Identification) active tag anti-collision algorithm which is fully compatible with an ISO-IEC_CD 18000-6C generation 2 standard for passive tags. We optimized and improved a conventional anti-collision algorithm in the ISO-IEC_CD 18000-6C standard to minimize the hardware overhead and maintain compatibility with conventional interrogators. Using a new sub-slot algorithm, we reduced the probability of collision. As a result of simulation, the time needed to read multiple tags is reduced by about 48% with the proposed sub-slot algorithm compared to the original algorithm exemplified in the ISO-IEC_CD 18000- 6C standard.
( Yong Hyun Jang ),( Sun Young Moon ),( Hyun Bo Sim ),( Sang Lim Kim ),( Weon Ju Lee ),( Seok Jong Lee ),( Jin Kyeong Choi ),( Sang Hyun Kim ),( Do Won Kim ) 한국피부장벽학회 2015 한국피부장벽학회지 Vol.17 No.2
The function of innate receptors has recently been extended to include epithelial barrier regulation. Toll like receptor(TLR)2 activation was shown to aid tight junction (TJ) repair in atopic dermatitis. However, the role of other TLRs in modulating epidermal barrier in vitro and in vivo remains poorly understood. We investigated the changes of TJ proteins following the activation of TLR 1 and 6 by house dust mite (HDM). Firstly, the mRNA levels of toll like receptors and TJ elements were assayed using real-time RCR in epidermal keratinocytes and a murine model with AD-like lesions activated by HDM allergen, Dermatophagoides farinae extracts (DFE). Additionally, the association between specific TLR activation and the changes of certain TJ proteins was studied in TLR deficient mice. Both in vitro and in vivo, DFE activated TLR 1 and TLR 6. In addition, DFE upregulated gene expression of TJ proteins including claudin-1, claudin-23 and occludin. These results provide the evidence that HDM triggers the activation of PRRs such as TLR 1 and TLR 6 and thus stimulates the modulation of TJ proteins. Moreover, gene expression of claudin-1, claudin-23 and occludin was not increased in TLR1 (tlr1(-/-)) and TLR6 (tlr6(-/-)) knockout mice. Our data suggest that the innate immune activation of the keratinocytes by HDM allergens contribute to lead the preservation of TJ integrity.