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Worker Safety in the Rare Earth Elements Recycling Process From the Review of Toxicity and Issues
신서호,김현옥,김경택 한국산업안전보건공단 산업안전보건연구원 2019 Safety and health at work Vol.10 No.4
Although the rare earth elements (REEs) recycling industry is expected to increase worldwide in high-tech industry, regulations for worker safety have yet to be established. This study was conducted to understand the potential hazard/risk of REE recycling and to support the establishment of regulations or standards. We review the extensive literature on the toxicology, occupational safety, and health issues, and epidemiological surveys related to the REEs, and propose suitable management measures. REE recycling has four key steps such as collection, dismantling, separation, and processing. In these processes, hazardous substances, such as REEs-containing dust, metals, and chemicals, were used or occurred, including the risk of ignition and explosion, and the workers can be easily exposed to them. In addition, skin irritation and toxicities for respiratory, nervous, and cardiovascular systems with the liver toxicity were reported; however, more supplementary data are needed, owing to incompleteness. Therefore, monitoring systems concerning health, environmental impacts, and safety need to be established, based on additional research studies. It is also necessary to develop innovative and environment-friendly recycling technologies, analytical methods, and biomarkers with government support. Through these efforts, the occupational safety and health status will be improved, along with the establishment of advanced REE recycling industry.
외식업 온라인 쿠폰 이용 사례 연구 : 휴면 고객 재방문을 중심으로
신서호,신서영,최규완,양일선 대한지역사회영양학회 2008 대한지역사회영양학회지 Vol.13 No.5
The purposes this study were to a) analyze the revisiting ratio of resting customers after issuing online coupons, b) compare the characteristics of coupon redemption customers with non-redemption customers. For this study, the customers of M restaurant who did not revisit during the last 8 months were classified as ‘resting customers’, totaling 4,052 customers. The online coupons, valid for 9 months, were sent via e-mail to those customers. After that, the data collected from those who redeemed the coupon in September 2006 was utilized. As a result of sending the coupon to 4,052 resting customers, 1,288 customers redeemed the coupon during the study period, showing relatively high redemption ratio (31.6%). The average check of customers with the online coupon was decreased by 22% compared with customers without the coupon, but the party size remained almost the same, 2.6 customers, and also the redemption ratio was increasing as the expiration date of the coupon was approaching. The redemption ratio of female (35.3%) was much higher than male (19.2%), representing higher redemption possibility of the female customers by issuing the coupon. The redemption ratio of the twenties (69.1%) was obviously higher than other age groups. Also, the non-redemption ratio of other groups except the twenties was higher than the redemption ratio. The redemption ratio of low-educated was higher, under college degree (58.6%), college degree (35.4%), and over college degree (16.6%). Following the result of the average visiting frequency of redemption customers during last the 8 months was 4.2, the frequency of non-redemption customers was 9.8. The total average visiting of non-redemption customer was 10.5, and that of redemption customers was 8.6. Customers who visited the restaurant less frequently in the past have higher possibility to revisit after receiving the coupon.
염 스트레스에서 벼(Oryza sativa L.)내염성 품종과 감수성 품종의 발아와 유묘 생육에 대한 자스몬산과 ABA 처리 효과
신서호,이영만 全南大學校 農業科學技術硏究所 2001 農業科學技術硏究 Vol.36 No.-
jasmontate(JA) and abscisic acid (ABA), plant hormones related with stress-tolerance, have been reported as improving salt tolerance of plant. Petri dish bioassay was conducted to determine effects of JA and ABA on salt tolerance of tolerant and susceptible varieties. Tolerant varieties were germinated at NaCl 23.3 ds/m while germination of susceptible varieties was inhibited. JA alone or combination of NaCl and JA did not affect germination of tolerant varieties whereas salt tolerance of susceptible varieties was significantly improved with increasing of JA concentration. However, ABA inhibited both tolerant and susceptible varieties by 95% compared with untreated control. In the early growth response of rice varieties to NaCl, plant height of susceptible varieties was 30 to 50% more reduced than was tolerant varieties. Single and combination with JA or ABA exhibited complete inhibition in shoot growth of tolerant and susceptible varieties. Effects of JA and ABA on salt tolerance of rice root growth tended varieties to be similar to those of germination of shoot growth. ABA inhibited root growth of both completely at all concentrations. The degree of inhibition greater in susceptible varieties than in tolerant varieties as the concentration progressively increased.
申西浩,李榮萬 全南大學校 農業科學技術硏究所 1994 農業科學技術硏究 Vol.29 No.-
토마토 유묘의 침수에 대한 품종간 생육 억제 정도 차이를 알아 보기 위하여 5개 품종 및 계통을 본엽 2엽기에 4cm 깊이로 침수 처리하였다. 침수 21일후 초장과 건물중에서 품종간에 현격한 차이를 나타내었는데, 초장과 건물중에서 무처리에 대한 백분율이 (TR*VC48-1)-11-3F4는 각각 110%와 113%로 침수에 의한 생육 저해가 없었다. 반면 Ohio MR*83606A는 초장과 건물중의 무처리에 대한 백분비가 각각 74%와 72%, 86HA-1은 각각 69%와 71%를 보여 침수에 의한 생육 저해가 컸다. To investigate the varietal difference of response to flooding in tomato the sec-ond-leaf-stage seedlings of five tomato varieties were subjected to flooding contimuesly for 21 days. The percents of control in plant height and dry weight of five varieties were significantly different. The plant height and dry weight of (TR*VC48-1)-11-3F4 were not reduced significantly by flooding.
신서호 ( Seo-ho Shin ),임경택 ( Kyung-taek Rim ),김종춘 ( Jong-choon Kim ) 한국산업보건학회 (구 한국산업위생학회) 2016 한국산업보건학회지 Vol.26 No.3
Objectives: This study was conducted in order to improve the current understanding of rare earths(RE) and to provide supporting data for establishing occupational health policies by reviewing the toxicological data and issues caused by the use of RE compounds in various fields. Methods: To evaluate the potential toxicity of RE from the viewpoint of occupational health, we summarized extensive reviews of relevant articles in the toxicology(animals and cells), occupational health and safety, and epidemiologic literature. Results: Although occupational RE exposure occurs extensively from ore mining and refining to end users in various industrial applications, epidemiologic study has not been performed among workers up to now. Bioaccumulation and adverse effects of RE have also been mentioned in ore mining regions and nearby residences, but safety standards for each process are insufficient. Moreover, because new commercial recycling technology will soon be applied to various industries, regulation and policies are needed for preventing abuse of recycling. In the results of animal toxicity for a few REs(mostly cerium, lanthanum, and gadolinium), toxicities of liver, lung, blood, and the nervous system were identified due to oxidative stress, but study of long-term RE exposure is required. Understanding the dual effect for RE and discovery of biomarkers pose a scientific challenge in further mechanism studies. Conclusions: In the future, additional hazard evaluation based on animal experiments is required, alongside continuous research for developing analytical methods and discovering biomarkers. Finally, RE occupational health and safety management needs to be integrated into the sustainable use of these materials.
벼(Oryza sativa L.) 내염성 품종과 감수성 품종의 유묘 염 처리 시 아미노산 및 단백질 함량 차이
신서호(Seo Ho Shin),이영만(Young Man Lee),조백호(Baik Ho Cho) 한국육종학회 2004 한국육종학회지 Vol.36 No.5
The changes of the amino acid content including proline and protein content in response to NaCl treatment were investigated in between the salt-resistant variety CI5309 and salt-susceptible variety IR28 of rice. The amino acid contents such as -aminoapid