• Korean Journal of Fisheries and Aquatic Sciences
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• v.50 no.6
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• pp.669-674
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• 2017

Paralytic shellfish toxins (PSTs) are produced by marine dinoflagellate phytoplankton Alexandrium spp. and Gymnodinium spp. These toxins accumulate in filter feeding organisms such as bivalves and the ingestion of contaminated shellfish can cause illness in humans. The mouse bioassay (MBA) has been the preferred PST testing method worldwide for more than 50 years. However, this assay has several disadvantages, such as detection limits, non-toxic-profiles, and the ethical issues of using animals. The aim of this study was to establish an alternative to the MBA method for testing for PSTs. We optimized the analysis conditions of a post-column oxidation-high performance liquid chromatography (PCOX-HPLC) method and the Scotia Rapid Test Kit, and then compared the accuracy of these methods to the MBA method. The results demonstrated a strong correlation between the PCOX-HPLC method and the MBA, although the PCOX-HPLC method required expensive equipment and standard material, and was time consuming. The Scotia Rapid Test Kit promises to be a useful tool, as it provided rapid and qualitative results, although the method sometimes gave a false positive result that could not be explained by toxin profiles.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.9 no.2
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• pp.158-166
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• 1999

The purpose of this study was to investigate the correlation between airborne total dust and man-made mineral fibers (MMMF), and to estimate total dust concentration to maintain below the American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV$^{(R)}$) for the MMMF. The regression coefficients between airborne total dust concentrations and fiber concentrations determined in the industries producing glass fibers, rock wool. refractory ceramic and continuous filament glass fibers products were 0.41, 0.42, 0.20 and 0.19, respectively. The size characteristics of fibers as well as the amounts of contaminated non-fibrous dusts could affect the correlation intensities. When total dust and fiber exposure data were compared with the occupational exposure limits, there was a large gap between two evaluation results. The regression coefficient between total dust and fiber data was increased ($r^2=0.88$) in the process of insulation installation generating in the higher levels of glass or rock wool fibers. In this case, an estimated total dust concentration of glass wool or rock wool fibers complying with the ACGIH TLV (1 f/cc) was $1.7mg/m^3$. In conclusion, the total dust and fibers concentrations was highly correlated at the higher exposure levels so that total dust-monitoring data could be used to control simply and economically and to estimate worker's exposure to fibers.

• Journal of Energy Engineering
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• v.28 no.4
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• pp.29-34
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• 2019

In this study, a quantitative risk assessment was carried out for a hydrogen complex station. The complex fueling station to be evaluated was hydrogen-LPG, and the components of each station were analyzed and the risk was evaluated. The final risk is assessed by individual and societal risks, taking into account the impact of damage and the frequency of accidents. As a result of individual risk calculation for the hydrogen-LPG fueling station that is the subject of this study, the hydrogen-LPG type fueling station does not show the unacceptable hazardous area (> 1 × 10E-3) proposed by HSE. The level of individual risk for both the public and the worker is within acceptable limits. In societal risk assessment, the model to be interpreted shows the distribution of risks in an acceptable range(ALARP, As Low As Reasonably Practicable). To ensure improved safety, we recommend regular inspections and checks for high-risk hydrogen reservoirs, dispensers, tube trailer leaks, and LPG vapor recovery lines.

• Journal of Food Hygiene and Safety
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• v.32 no.4
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• pp.275-283
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• 2017

We inspected contaminations of pesticides in the 3,313 crop samples grown under the standard of Korean Good Agricultural Practices (GAP) between 2014 to 2016 May. According to our inspection, violations by unregistered pesticide contaminations far outweighed those by exceeding maximum residue limits. Most of the crops contaminated with unregistered pesticides were minor vegetable crops, for which far less pesticide products are registered compared to cereal grains and fruits. And in our second study, the pesticide in the sprayer was removed 90% or more, but not totally by serial rinses. From this result, it is assumed that pesticide remained in the rinsed sprayer can be carried over to crops unintentionally. Our study shows that supplying pesticide products evenly to all kinds of crops and allowing unintentional carry-over of unregistered pesticides to a certain extent are solutions to revitalize depressed Korean Good Agricultural Practices.

• Journal of Food Hygiene and Safety
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• v.8 no.4
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• pp.215-223
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• 1993

Chloramphenicol (CAP) is a very effective broad-spectrum antibiotic which had been widely used in animal production. However, the drug is not approved in many countries for use in food-producing animals because of its potential toxicity and the possibility of residues in food products. In this study, a modified microbiological assay was developed for the sensitive detection of CAP residues in meat and milk. The method was characterized by the extraction of CAP with ethyl acetate, addition of $0.15\;\mu\textrm{g}$ oxytetracycline/ml in the phosphate buffer diluent (pH 6.0), a luteus ATCC 9341. The lowest levels of CAP detected in muscle tissues and milk were $0.025\;\mu\textrm{g}/ml\;and\;0.05\;\mu\textrm{g}/g$, respectively. Recovery rates free CAP from milk were 68.5%, from bovine muscle 65.1%, from swine muscle 63.8%, and from chicken muscle 59.4%, respectively, and the coefficients of variation were 1.8~15.1%. The results showed that the detection limits of CAP residues in animal products could significantly be improved by the modified microbiological assay than the conventional ones.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.27 no.2
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• pp.97-104
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• 1991

Generally, the coefficients of common holding power of an anchor and a chain cable have been reported too higher in their values in the safety of the shiphandling. The model experiment was carried out to find the most suitable coefficients of holding power of the Hall's type anchor and the chain cable in various kinds of seabed. The results obtained are summarized as follows; 1) The coefficients of holding power of the anchor and the chain cable were 4.05, 0.75 in the mud, 3.95, 0.66 in the sand and 3.61, 0.72 in the pebbles respectively. 2) The experimental coefficients of holding power of the anchor and the chain cable were 0.4~0.6 times the values of the coefficients of common holding power. They were almost same as the values of the coefficients of safe holding power in the mud and the sand, but in case of the pebbles, they were 1.4~1.8 times the values of the coefficients of safe holding power. 3) It is considered useful for the safety of the shiphandling to draw curves of the holding power with maximum limits holding power at the various wind forces and the coefficients of holding power.

• Journal of the Korean Society of Marine Environment & Safety
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• v.18 no.2
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• pp.131-138
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• 2012

The tourism industry is considered as the world largest industry and it is assessed as the most effective way to create employment. In particular, the marine tourism industry such as marine leisure sports, cruise can create high added value so that its significance has been more emphasized. Korea has natural tourist attractions such as more than 3,000 islands, about 12,000km lengths coastline, wide wetlands and beautiful seascape. In addition, the establishment of the five-day workweek and the development of means of transportation make the policy demand of the public for marine tourism increase continuously. However, Korea currently lacks policy and system for revitalizing marine tourism industry as the new growth engine and has not made good use of its retained tourist resource. Accordingly, this study explores the current situation and challenges of Korean marine tourism industry and further analyses the limits of the national legal systems for marine tourism. Lastly, it suggests policy recommendation for promoting marine tourism industry.

• Journal of the Korea Safety Management & Science
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• v.12 no.2
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• pp.183-192
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• 2010

Korean logistics industry have been focused on transportation business. However, with the expansion of the electronic commerce and on-line shopping, delivery service is now dramatically growing. Despite the expansion of logistics market, the domestic logistics industry have significant structural problems such as low productivity comparing with the advanced countries, relatively high cost and shortage of human resources and lack of professionalism of people in the industry. Logistics companies reallocate employees, use subcontractors, expand consignment and training the employees to overcome the labor shortages but it has some limits. In recognition of the importance of labor in the logistics industry, financial support and investment have increased. Logistics companies tend to hire consultants, set up logistics department or R&D center in order to establish highly productive logistics process and system so it is viewed that there will be considerable demands of human resources in the logistics industry. This study indicates implications and development direction of human resources in the logistics industry by looking into prospect and characteristic of the industry, employment status, training programs and qualification requirements.

• Journal of the Korea Safety Management & Science
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• v.16 no.2
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• pp.203-210
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• 2014

The purpose of this study is to understand the meaning and essence of concrete and practical experience on a series of debates to reveal factors that could be exposed when middle or old-aged people are in the process of re-employment process when they were unemployed by exploring the phenomenon of experience on the courses for the unemployed focusing on middle or old-aged people for employment support program. Depth consultation interviews were conducted and the structure of this phenomenon was revealed and described by applying Giorgi's phenomenology technical as a procedure for analyzing participants' statements by concentrating on the essence of the experience in this study. The meaning of the experience of the unemployed re-employment process structure as a result of analysis on the nature of re-employment experience on the basis of research participants and the information stated through this study showed respectively such as , , , , , and "Reemployment Success Factors>. It is a significant meaning that middle and old-aged people were able to confirm that they experienced Dynamic pursuit of hopes and dreams and got the chance to participate in society Toward a new life By strengthening employ ability skills by undertaking vocational training, obtaining licenses, and regaining confidence and employment determination, and a lot of desire using the card for learning tomorrow, government support system.

• Journal of the Korean Institute of Gas
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• v.17 no.4
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• pp.33-38
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• 2013

A study was carried out on the effect of particle size (mean diameter) on magnesium dust explosion. Experimental investigations were conducted in a 20-L explosion sphere, using 10 kJ chemical ignitors. Explosion tests were performed with three different dusts having mean diameter (38, 142, $567{\mu}m$) and the dust concentrations were up to $2250g/m^3$. The lower explosion limits(LEL) of magnesium dusts were about $30g/m^3$ at $38{\mu}m$ and $40g/m^3$ at $142{\mu}m$. LEL tended to increase with particle size and this means that the explosion probability of magnesium dust decreased with increase of particle size. The maximum explosion presssure ($P_m$) and $K_{st}$ (Explosion index) decreased with the increase of particle size. For magnesium powder of $567{\mu}m$, however, the explosive properties were not observed in the 5 kJ ignition energy.