• Biomedical Science Letters
• /
• v.11 no.3
• /
• pp.397-405
• /
• 2005

Noise may cause damage of the auditory system, hypertension, and cardiovascular disease. However, we haven't the data enough to be available for understanding various effects of noise on the human body. The current study was prospectively designed to investigate the changes of the cardiac factors and cerebral hemodynamics following a transient exposure to noise in young people. 80 subjects (mean aged $23.45\pm2.40$ years) participated in this experiment and were exposed to excavator-noise with 90 decibels for 15 minutes using ear-phone. Cardiac factors such as heart rate (HR), blood pressure (BP) and heart rate-systolic pressure product (RPP), and cerebral hemodynamics such as mean blood flow velocities (Vm), pulsatility indexes (PI), resistance indexes (RI) and mean blood flow velocities at breathing-hold (Vh) in the middle (MCA), anterior (ACA) and posterior cerebral arteries (PCA) were measured before (baseline) and during the noise-exposure. Although there were individual differences in above mentioned parameters, HR, systolic and diastolic BP, RPP, MCA-Vm, MCA-PI, MCA-RI, ACA-Vm, ACA-PI, ACA-RI, PCA-Vm, PCA-PI, and PCA-RI during the noise-exposure decreased compared with the baselines (P<0.05 or P<0.01), The findings of the present study suggest that a transient exposure to excavator-noise at rest causes changes in the cardiac factors and cerebral hemodynamics with individual differences. Further studies need to be carried out for clarifying the effects of longer exposure and combined mental activity with noise exposure.

• The Korean Journal of Community Living Science
• /
• v.21 no.3
• /
• pp.311-322
• /
• 2010

The purpose of this study was to examine food hygiene knowledge and health practice levels of elementary school students at foodservice in the Suwon area. Of the 500 upper graders from three elementary schools, 486 students (97.2%) participated in the study. The questionnaire was composed of general characteristics including experience of serving food at school, food hygiene knowledge (25 questions), and health practice (18 questions). The results were as follows: The education experiences of food hygiene were below 40% though most students (88.1%) participated in providing food at foodservice. The percentage of correct answers in food hygiene knowledge was over 70% in most questions, but relatively lower in food preservation temperature (44.7%) and food poisoning bacteria (43.2%). When we examined food hygiene behavior of elementary school students in 5scales, the level of personal hygiene management was 4.04, sanitary management in food product was 3.62, environmental hygiene was 3.92, and foodborn disease and food microorganism was 3.81. Each level in each subarea was significantly related in the frequency of hygiene education experiences. Finally, the food hygiene knowledge was positively correlated with its behavior level in elementary school foodservice. These results suggested that the knowledge of food hygiene may affect its behavior, and therefore, regular education of food hygiene at home and school would be needed to improve food safety in foodservice.

• Journal of Advanced Marine Engineering and Technology
• /
• v.39 no.1
• /
• pp.99-104
• /
• 2015

Life rafts, which has been used for domestic vessel currently, are fabricated mostly for the ocean-going vessels in accordance with the SOLAS Resolution. Therefore, there is not any small-sized life raft which can be installed on small fishery boat, leisure boat and cargo vessel with those length shorter than 20 meters in our country. However, in many foreign countries, new standards or the small-sized life rafts applicable to those small vessel have been developed according to the standard of ISO 9650. Furthermore, they make their effort to contribute the safety for the life at sea by supply the superior product of life rafts, which have been adopted by light material (i.e. thermoplastic polyurethane, TPU) and economic production process (i.e. heat sealing, radio-frequency welding, RFW), etc. In this paper, the development results of the small-sized life raft, which has been used the lightening material TPU and fabricated by RF-welding method, will be introduced.

• The Journal of the Korea Contents Association
• /
• v.16 no.1
• /
• pp.42-51
• /
• 2016

For changes in the distribution structure these days, consumer demand is moving rapidly from offline to online. The consumers' mentality to purchase products conveniently is reflected in this phenomenon. Also for agricultural products, safety to protect contents, brand and design which can provide credibility to consumers are recognized as most important than ever. Especially, strawberry is thin-skinned so that the quality of product may deteriorate even with weak impact and shaking, so it is significantly influenced by the structural packaging or material. Also, strawberry is frequently distributed through direct trading, it is the reality that the package design of strawberry is less competitive than that of other products due to inadequate environments of commercial farms. That is, the demand of strawberry increases everyday but the strawberry package cannot fulfill the needs of producers and consumers. In order to reinforce competitiveness in strawberry sales, it is urgent to carry out fundamental studies regarding the development of package. Therefore, the purpose of this study is to supplement and improve issues arising from the usage of current strawberry package. Through the analysis of strawberry package elements (shape, material, design) and understand the points of improvement sought by producers and consumers through IPA MAP (importance, satisfaction level) analysis.

• Korean Journal of Human Ecology
• /
• v.20 no.2
• /
• pp.427-437
• /
• 2011

This study was conducted to investigate the utilization, recognition, and satisfaction of environment-friendly agricultural products (EAPs) in school food services according to the type of foodservice in the Jeonbuk area. Among the 270 school food service providers evaluated, 56.3% of the schools were located in an urban area and 43.7% were in a rural area. About 80% of urban schools used the EAPs for school foodservice, and 89.8% in rural schools (p<.05). The purchase frequency of grain (p<.01), fruits (p<.05), and processed foods (e.g. Tofu) (p<.001) was significantly different between the urban and rural schools. The perception of school dietitians in urban and rural schools between the EAPs and general agricultural products was significantly different (p<.05). The most different fact was 'safety' (p<.001). Most school dietitians has a gut understanding and a lot of confidence about the system of EAPs (p<0.01). The satisfaction score with EAPs was 3.35; in the urban schools it was 3.36 and in the rural schools 3.12 (p<.01). The satisfaction with EAPs in urban and rural schools was significantly different with regard to several factors; these were 'design' (p<.05), 'color' (p<.001), 'fresh' (p<.001), and 'diversity' (p<.01). There are conflicting views between the urban and rural schools for the additional costs brought by using EAPs (p<.01). In conclusion, our central and local governments should change their roles in financially positive ways and reflect the issue to make the policy effective.

• Preventive Nutrition and Food Science
• /
• v.9 no.2
• /
• pp.190-193
• /
• 2004

This review was conducted to evaluate the 'Korean Food Composition Table' and establish it as an internationally accepted database by examining its contents and evolution over time. The food composition table has been published by National Rural Living Science Institute, every 5 years, listing the nutrient content for each food, as both the raw agricultural product and processed foods, since the 1$^{st}$ edition in 1979 by RDA (Rural Development Administration). This is the basic data applied to the evaluation of the nutritional value of foods in Korea. The data is used as a useful tool in many fields, not only for the establishment of the National Food Supply Plan but also for nutritional research, the draft of National Food Policy, and in clinical and epidemiological research. The database is also utilized by food service providers and food processors, etc. Consumers and the international society have been interested in the quality and safety of foods and raw agricultural products. As these data expand in volume, the type of foods included in the composition table is expanded to cover new additions for the convenience of users of the 'Nutrient Data Base' as judged by the publishers. The form of these reports varies, according to the current information, from a simple booklet to CD-ROM and to the Web service. We expect to continue to make improvements in the National Standard Table for food composition through expanding both the quantity and quality of data in an orderly manner. This effort can help food composition data to be comprehensively developed systematically and gradually at the national level.l.

• Asian-Australasian Journal of Animal Sciences
• /
• v.30 no.11
• /
• pp.1540-1549
• /
• 2017

Objective: Increasing food safety demands in the animal product market have created a need for a system to trace the food distribution process, from the manufacturer to the retailer, and genetic traceability is an effective method to trace the origin of animal products. In this study, we successfully achieved the farm tracing of 6,018 multi-breed pigs, using single nucleotide polymorphism (SNP) markers strictly selected through least absolute shrinkage and selection operator (LASSO) feature selection. Methods: We performed farm tracing of domesticated pig (Sus scrofa) from SNP markers and selected the most relevant features for accurate prediction. Considering multi-breed composition of our data, we performed feature selection using LASSO penalization on 4,002 SNPs that are shared between breeds, which also includes 179 SNPs with small between-breed difference. The 100 highest-scored features were extracted from iterative simulations and then evaluated using machine-leaning based classifiers. Results: We selected 1,341 SNPs from over 45,000 SNPs through iterative LASSO feature selection, to minimize between-breed differences. We subsequently selected 100 highest-scored SNPs from iterative scoring, and observed high statistical measures in classification of breeding farms by cross-validation only using these SNPs. Conclusion: The study represents a successful application of LASSO feature selection on multi-breed pig SNP data to trace the farm information, which provides a valuable method and possibility for further researches on genetic traceability.

• Korean Business Review
• /
• v.16
• /
• pp.99-121
• /
• 2003

In consumer research area, familiarity has been frequently mentioned with relation to customers' product information processing and choice behavior. However, the familiarity has been utilized initially in this paper to examine if the relationship between consumers' evaluations of attributes of an internet shopping mall and their inquiry and purchase intentions on there is affected significantly by the degree of familiarity. The results have shown that the relationship between levels of the safety, the functional convenience, and the tangibility attribute of an internet shopping mall and consumers' willingness to inquire about/purchase products on there is affected significantly by the degree of familiarity. Interestingly, the relationship between the tangibility attribute of a mall and customers' inquiry willingness on there is not impacted significantly by the familiarity. Thus, we conclude that our model and hypotheses have been supported quite strongl.

• Proceedings of the KIEE Conference
• /
• 2008.10c
• /
• pp.226-228
• /
• 2008

In recent years, the companies of electric power equipment for MV and HV classes trend to develop the eco-friendly insulated(solid, eco-gas, air etc.) switchgear which replaces existent SF6 gas insulated switchgear due to environmental problems such as global warming and so on. This paper makes reference to the newly developed Solid Insulated Switchgear (SIS) which uses the eco-friendly material such as epoxy for insulation. The insulation of the solid insulated switchgear (SIS) is composed of an epoxy, vacuum and air. The solid insulated switchgear (SIS) is a slate of the art product. The advantages of SIS are advanced reliability, economical efficiency, safety, maintenance free, reduction of installation area and the protection of environment. The solid insulated switchgear (SIS) is FE Analyzed such as electromagnetic, mechanical, thermal and fluid in order to find the optimal design. Thens SIS has been verified by international standard test. (IEC 62271 - 100 and so on.) As a result of this, the solid insulated switchgear (SIS) has been estimated as an alternative for eco-friendly MV class switchgear.

• Journal of the Korean Recycled Construction Resources Institute
• /
• v.2 no.2
• /
• pp.158-165
• /
• 2014

The enormous quantity of 'Bayer-Process by-products' (BP by-products) discharged by industries producing alumina from bauxite represents an environmental and economical problem. As it is mainly composed of $Fe_2O_3$, $Al_2O_3$, $SiO_2$, CaO and $Na_2O$, it is thought that using BP by-products as a construction material is an effective way to consume such a large quantity of alkaline waste. In this study, This study evaluates the effect of alkali-activated binder based on recycling BP by-products on soil improvement through the evaluation of slope stability and seepage flow numerical analysis. The results of analysis of ground slope safety at dry season and wet season meet standard (Ministry of Land, Infrastructure and Transport, 2006) Especially, when wet season, the ground used soil improving material meet standard, while the ground used soil-nailing method doesn't. Also, permeability coefficient of improved soil is smaller than that of natural soil and saturation depth of reinforced ground surface with improve soil is lower than that of natural soil.