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고압멸균 처리시간에 따른 닭 체내 조류인플루엔자와 뉴캐슬병 바이러스의 멸균효과
이진주 ( Jin Ju Lee ),김동혁 ( Dong Hyeok Kim ),임정주 ( Jeong Ju Lim ),김대근 ( Dae Geun Kim ),민원기 ( Won Gi Min ),이후장 ( Hu Jang Lee ),장홍희 ( Hong Hee Chang ),김석 ( Suk Kim ) 한국예방수의학회(구 한국수의공중보건학회) 2011 예방수의학회지 Vol.35 No.4
Avian influenza (AI) and Newcastle disease (ND) distress a variety of avian species, especially domestic poultry. Severe syndromes are caused by highly virulent specific virus strains termed highly pathogenic AI and velogenic ND viruses, which are potential agrobioterrorism agents. This outbreak emphasizes the need for continuing cooperation between public health and veterinary medical communities in controlling AI and ND when it has a zoonotic potential. Up to date, the stamping out and burying system were applied for controlling methods against these highly infectious diseases in the ordinary way, however these methods had many environmental problems, including leachat and effluvium. Thus, we assessed that sterilization effect of AI and ND virus dependent on several treatment conditions, such as autoclaving time and cutting types of chicken. As a result, we found that the cutting type of chicken meat revealed a reduced HA titer (20) against both of AI and ND virus after 10 min of autoclaving, while whole chicken showed same titer after 30 and 60 min. Therefore, we propose that the conditions of treatment on infected chicken should be developed for convenient, affordable, and effective prevention methods against for AI and ND.
Jun-Hyeok Seo,Hye-Won Yang,So-Young Joo,Su-Min Song,Yu-Ran Lee,Jae-Sook Ryu,Eun Sang Yoo,Won Kee Lee,Hyun-Hee Kong,Sang-Eun Lee,Won-Ja Lee,Youn-Kyoung Goo,Dong-Il Chung,Yeonchul Hong 대한기생충학열대의학회 2014 The Korean Journal of Parasitology Vol.52 No.5
Trichomonas vaginalis, a causative agent of trichomoniasis, may trigger symptomatic or asymptomatic nongonococcal urethritis and chronic prostatitis in men. Despite the availability of highly sensitive diagnostic tests, such as nucleic acid amplification tests, including PCR, few prospective studies present data on male T. vaginalis infection in South Korea. In the present study, the prevalence of T. vaginalis and associated clinical conditions were evaluated in 201 male patients from a primary care urology clinic in South Korea. The prevalence of T. vaginalis infection in our cohort was 4% (8/201) by PCR. T. vaginalis infection was common in men older than 40 years (median age, 52 years). Among the 8 Trichomonas-positive patients, 87.5% (7/8) had prostatic diseases, such as prostatitis and benign prostatic hyperplasia, and 25.0% (2/8) and 12.5% (1/8) were coinfected with Chlamydia trachomatis and Mycoplasma genitalium, respectively. Our results suggest that T. vaginalis infection is not rare in men attending primary care urology clinics in South Korea, especially in those older than 40 years, in whom it may explain the presence of prostatic disease. The possibility of T. vaginalis infection should be routinely considered in older male patients with prostatic diseases in South Korea.
정밀금형용 SKD61 강의 복합표면처리에 의한 표면신뢰성 향상
박민혁(Min-Hyeok Park),김동오(Dong-O Kim),엄정원(Joung-Won Eom),김진영(Jin-Yeong Kim),김유진(Yu-Jin Kim),김은우(Eun-Woo Kim),양원존(Won-Jon Yang),심동하(Dongha Shim),변재원(Jai-Won Byeon) 한국신뢰성학회 2022 신뢰성응용연구 Vol.22 No.2
Purpose: The lifespan of a die-casting steel mold depends on its surface hardness and wear resistance. Gas nitriding treatments for forming surface hardening layers have been widely applied to fabricate reliable die-casting molds. In the present study, we propose a complex surface treatment consisting of a micro-shot peening process and a sulfo-nitriding treatment to improve the surface hardness of SKD61 mold steel. Methods: The cross-sectional microstructure of the complex surface-treated SKD61 mold steel was observed using an optical microscope and a scanning electron microscope. The phase of the surface hardening layer was analyzed using an X-ray diffractometer. The micro-hardness and residual stress of the complex surface-treated SKD61 mold steel were evaluated as well. Results: The surface hardening layer consisted of the top-most compound layer and a diffusion layer. The micro-shot peening pretreatment increased the thickness of the compound layer. The general nitriding (GN) treatment led to the formation of the FexN compound layer, while the sulfo-nitriding (SN) treatment led to the formation of the FexN and FeS composite compound layer, which was thicker than the compound layer of the GN specimen. The hardness of GN and SN hardening layers improved by 125% and 135%, respectively, relative to that of the as-received SKD61 mold steel with a hardness of 450 HV. Conclusion: The SN treatment formed a reliable hardening layer with superior hardness than the GN treatment. Furthermore, the thicker sulfo-nitride compound layer produced by the SN treatment can further improve the lifespan of SKD61 steel molds.
하위 무릎뼈를 지난 성인들을 대상으로 쪼그려 앉기 운동 시 하위 무릎뼈 스트랩을 이용한 무릎뼈 높이 변화가 넙다리네갈래근의 근 활성도에 미치는 영향
강민혁(Min-hyeok Kang),김지원(Ji-won Kim),윤지연(Ji-yeon Yoon),장준혁(Jun-hyeok Jang),오재섭(Jae-seop Oh) 한국전문물리치료학회 2012 한국전문물리치료학회지 Vol.19 No.1
The purpose of this study was to assess the influence of patellar height on quadriceps muscles’ electromyography (EMG) activity during a squat exercise in adults with patella baja, For the study, we recruited 15 volunteers who had patella baja on the right side. We measured the EMG activity of the right rectus femoris, vastus medialis oblique, and vastus lateralis muscles during squat exercises under two conditions, specifically with and without an infra-patellar strap. The infra-patellar strap was applied below the tested patella to elevate the patella to a normal height. A paired t-test was used to compare the effects of patella height on EMG activity of the quadriceps muscles. The EMG activity of the rectus femoris (RF), vastus medialis oblique (VMO), and vastus lateralis (VL) muscles were significantly decreased during the squat exercise with the infra-patellar strap compared to the same exercise without the infra-patellar strap (p<.05), while the VMO/VL ratio was not different significantly between two conditions (p>.05). The findings of this study suggest that an infra-patellar strap may benefit people with patellar baja, as changes in patellar height could improve the efficiency of the quadriceps muscles.
웨어러블 센서 데이터 기반의 교통사고 위험 알림 시스템
최민혁 ( Min-hyeok Choi ),정지원 ( Ji-won Jung ),변찬혁 ( Chan-hyeok Byun ),최태원 ( Tae-won Choi ),장명호 ( Myungho Jang ),김희주 ( Heeju Kim ),송충건 ( Chung-geon Song ),유헌창 ( Heonchang Yu ) 한국컴퓨터교육학회 2017 한국컴퓨터교육학회 학술발표대회논문집 Vol.21 No.1
대한민국은 교통사고 발생건수는 OECD 국가들 중 최상위에 있다. 그러나 국내 교통사고 예방을 위한 연구에서는 외부 센서를 통해 충돌을 회피하거나 충격을 감지하여 운전자를 보호하는 장치에 대한 적용만을 고려하고 있다. 본 연구에서는 운전자의 위험행위를 감지하기 위하여 웨어러블 센서를 이용하여 위험상황을 인식하고 사용자에게 경고를 전달하여 교통사고를 예방하는 시스템을 제안하고자 한다. 연구의 결과는 향후 국내 교통사고 예방 시스템 구축에 활용 되어 국내 교통사고 감소비율 증가에 기여할 것으로 기대된다.