• Journal of the Korean Geotechnical Society
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• v.20 no.3
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• pp.23-31
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• 2004

Normally, coating is used for protecting reinforced concrete. For this purpose, both organic and inorganic coatings are used. The advantages of inorganic coatings are lower absorption of UV, non-burning etc. On the other hand, organic coatings have the advantage of low permeability of $CO_2, SO_2$ and water. Organic coatings provide better protection for reinforced concrete. However, organic coatings such as epoxy, urethane and acryl reduce long-term adhesive strength by the difference of their thermal expansion coefficients and elastic modules from those of concrete, and the formed coating cover of these is blistered by poor breathing. Also, when organic coatings are applied to the wet surface of concrete, they have a problem with adhesion. In this study, a new coating material for protecting concrete was hybridized with polymer and ceramics. And tests were carried out on its physical and durable characteristics, and safety characteristic on elution. All results were compared with organic coating materials and epoxies and showed that the performance of the developed coating material was not inferior to that of other organic coatings in protecting concrete. On the other hand, safety characteristic on elution was superior to epoxies which were used in this study. So, the developed coating material was considered as a suitable protecting coating material which have advantages of inorganic and organic coatings for protecting underground concrete structures, especially in contact with water.

• Journal of Radiation Protection and Research
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• v.38 no.1
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• pp.1-9
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• 2013

Education and training is an important means of promoting safety culture and enhancing the level of competence of radiation worker in radiation protection. The existing international nuclear education and training of short duration has been carried out on the high-level officials and focussed on the classroom based training. The developing countries has been asking for support to cultivate their own technical experts to Korea which is a donor country exporting nuclear power plants. This paper summarizes the results of developing and operating the international education and training course to froster technical experts in radiation protection that emphasized practical training sessions and technical visits using the excellent domestic radiation facilities and infrastructure of education and training. It mentions the procedures of assessment and feedback as well. In an effort to maximize teaching-learning effects and to maintain consistency of the learning objectives, methods and assessment, SAT methodology has been applied on the processes of developing and operating the course. In the comparative and final assessment which were conducted at the beginning or at the end of training course, participants' average score increased around 2 points. The questionnaire of participants showed a high level of satisfaction of 4.0 points or above for the most of the questions. These imply teaching-learning methods applied to it might be effective. The teaching-learning methodologies may provide the opportunity to develop the customized training course for bringing up international technical experts and to shift educational paradigm from theory-oriented to on-site practice-based education.

• Food Industry
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• s.181
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• pp.68-91
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• 2004

조미료란 식품을 조리, 가공, 섭취할 때 맛을 증진시키거나 강화시킬 목적으로 사용되는 물질을 일컫는다. 발효, 종합 및 천연계 조미료의 국내외 시장동향에 대해 살펴보고, 조미료의 향후 발전방향과 중점 연구 분야, 관련업계의 연구개발 동향에 대한 고찰을 토대로 조미료 분야의 고부가가치 산업으로의 육성방안에 대해 알아보았다. 미원, 아이미 등으로 대표되는 발효조미료의 내수시장은 성숙기를 거쳐 소폭 감소세를 보이는 쇠퇴기에 접어들고 있다. 이는 소비자의 MSG에 대한 기피현상이 주 원인으로 판단된다. 전반적으로 품질 차별화 없이 가격 경쟁이 심화되고 있는 실정이다. 국내 종합조미료 시장은 1975년 국내에 처음으로 CJ에서 다시다 제품을 출시한 후 대상에서 1982년 맛나, 1988년 감치미를 출시하면서 30여 년간 지속적으로 성장해 왔다. 현재 시장규모는 2천억원에 이르고 있으며 최근 들어서는 성장세가 완만해지고 있고 가정용은 거의 정체되어 있다. 일본 조미료 시장은 발효조미료, 종합조미료 그리고 다양한 조미식품의 소재로 활용되는 천연조미료로 구분할 수 있다. 발효조미료 시장은 국내와 비슷한 상황으로 전체적인 물량변화는 약간 감소하는 경향이며 생산기지의 해외이전 현상이 뚜렷하다. 종합조미료 시장은 한국과 유사한 풍미조미료 외에도 보다 전문화되고 다양한 형태의 조미료가 시판되고 있으며, 전통적인 풍미조미료는 정체현상을 보이고 건강지향, 전용화 조미료가 호조를 보이고 있다. 일본과 한국의 조미료 발전 단계는 조금 차이를 보이고 있다. 현재 한국은 종합조미료 시대에서 용도별 조미료 시대로 넘어가는 단계에 있는 반면, 일본은 이미 메뉴 전용 조미료시대에 접어들었고, 건강, 기능성을 강조하는 시대로 나아가고 있다. 이들 변화는 건강에 대한 소비자의 관심과 그로 인한 보다 천연에 가까운 조미소재에 대한 수요, 동시에 맛에 대한 충족까지 요구하는 시대적 변화에 따른 필연적 결과로 보인다. 미래의 조미료는 천연계 소재의 사용량이 증가할 것이고, 소비자의 건강, 안전 추구심리에 부흥하여 안전성과 기능성을 부여하는 소재에 관심이 집중될 것으로 보인다. 더불어 전반적인 생활수준 향상에 따라 제품의 고급화와 전용화도 진행될 것으로 보인다. 향후 조미료시장을 주도할 각 현상에 대해 좀더 자세히 알아보고 학계 및 업체의 최근 연구동향과 제품개발 현황에 대해 고찰해 보았다. 기술연구 동향을 보면, 나노 기술에 의한 조미신소재연구, 초미분쇄기술, 미세 캡슐화 기술, 생물공학 기술이 활용된 발효 및 효소분해에 의한 펩타이드계 조미소재 개발 등이 활발하게 진행되고 있다. 선진업체 연구 및 제품개발 동향은 아지노모트/교와의 ''코쿠미''계 조미소재 연구개발, 일연푸드/동해물산의 천연 엑기스계 조미소재 연구개발, 보조주(주)의 주류 조미료 개발 위주로 살펴보았다. 조미료 시장의 발전 과정과 선진 업체들의 연구, 개발동향을 종합해 보면 첫째는 천연 건강지향에 부응하는 차별화된 소재 및 기능성 소재 개발이고 둘째는 맛과 편리함의 추구에 대응하는 메뉴 전용화 추세이다. 이를 위한 기술적 연구도 기능성 소재(히스티딘 함유 디펩타이드)개발, 나노기술, 미세캡슐화 기술 등을 통하여 다양하게 진행되고 있다. 조미료 산업을 첨단 고부가가치 산업으로 육성하기 위해서는 R&D 투자확대와 효율성을 제고하는 것이 필수적이다. 각 기업단위에서는 장기적 차원에서 첨단식품 기반기술에 대한 연구를 수행하거나, 전문 중소기업, 벤처를 육성하는데 지원해야 한다. 그러나 현실은 당장의 수익과 회사간 경쟁으로 인해 장기적 투자, 사회적 인프라 육성 등에는 관심을 쏟지 않고 있다. 조미료를 비롯한 식품에 관련된 기술들이 다양한 기초연구와 응용기술, 개발연구 등의 총합인 경우가 많기 때문에 이들 상이한 연구 분야간의 연계를 강화하고 개발된 기술의 이전, 확산체계를 구축할 필요가 있다. 이를 위해 기업간 수평적 네트워크 외에도 국가기관이 참여하는 연구 자원의 효율적 집행 기관이 필요하리라 본다.

• Food Science and Preservation
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• v.21 no.5
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• pp.652-660
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• 2014

To maintain the microbiological safety of Prunus mume fruit before it is processed, it was treated with a combination of 0.5% citric acid and 0.1% Tween 20, and stored at $4{\pm}1^{\circ}C$ for seven days. The combined treatment reduced total aerobic bacteria, yeast, and mold populations in the fruit by 2.20 and 1.70 log CFU/g, respectively, compared to those in the control. Organic acid contents and the Hunter $L^*$, $a^*$, and $b^*$ values were not affected by the treatment during the storage. In addition, the dried Prunus mume fruit prepared with 40% red algae extract (RAE) or maltodextrin (MD) treatment and hot-air drying were compared with respect to the fruit's physicochemical properties such as color, total phenolic and flavonoid content, and microstructure. The hot-air dried samples had undesirable color changes and inferior textures. The RAE-treated samples had a higher total phenolic content (225.15 mg gallic acid equivalent (GAE)/100 g) and total flavonoid content (49.25 mg quercetin equivalent (QE)/100 g) than the other treatments. The treatment of Prunus mume fruit with RAE can provide better-dried products than can MD treatment or hot-air drying. These results suggest that the combined treatment with citric acid and Tween 20 can be effective in preserving the microbiological safety of Prunus mume fruit, and its dehydration using RAE is an efficient drying method.

• Journal of Environmental Policy
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• v.8 no.3
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• pp.53-79
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• 2009

This study conducted a regulatory impact analysis regarding the introduction of the Korean version of REACH(Registration, Evaluation and Authorization of Chemicals). The direct cost of the Korean REACH is estimated at a total of 101 billion Korean won over the 11 year period. The cost includes pre-registration, testing, registration, Chemical Safety Assessment(CSA) and Chemical Safety Report(CSR), evaluation, and the authorization costs of 15,223 chemical substances produced and imported more than 1 ton per year in Korea in 2006. With regard to the benefit, the only public health benefit is included in the estimation. Based on the available foreign and domestic data, this study estimated that the economic values of public health benefits are in the range of 33.2~138.6 billion Korean won if only the savings of the National Health Expenditures are considered and it reaches 203.9~1,640.3 billion Korean won if the willingness to pay(WTP) for disease prevention is included. This study proved that the Korean REACH passed the cost/benefit criteria. The benefit-cost ratio of the Korean REACH, however, is estimated to be lower than its EU counterpart. Thus it is suggested that a rigorous study to reduce the costs to industry be required before the Korean government introduces the Korean REACH.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.14 no.3
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• pp.38-49
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• 2015

Seoul has 424 traffic fatalities in 2010 and 227 of them related to pedestrian crashes. In addition, it revealed that 40% of pedestrian fatalities occurred during jaywalking. Through the effective methods preventing jaywalking can save lots of people, and it can reduce social costs pertinent to pedestrian crashes. Therefore, this study is to suggest the methods preventing jaywalking through conducting literature reviews, human factors with pedestrian and vehicle characteristics, as well as geometric features of accident site or spot. Firstly, in order for examining the contributing factors of accident, this research conducts statistical analysis on pedestrian accidents specifically in jaywalking. Secondly, the analysis on human factors about pedestrian and drivers revealed that drivers with high speed play pivotal roles in pedestrian fatalities. Thirdly, Road and environment factors showed both expected and contradictory results through analyzing total numbers of lane or dry/icy pavement conditions. Consequently, this study can be used to prevent and alleviate pedestrian accidents as well as expected to be applied to future researches about pedestrian safety facilities.

• Journal of Internet Computing and Services
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• v.17 no.6
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• pp.81-91
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• 2016

VANET is one of the most developed technologies many people have considered a technology for the next generation. It basically utilizes the wireless technology and it can be used for measuring the speed of the vehicle, the location and even traffic control. With sharing those information, VANET can offer Cooperative ITS which can make a solution for a variety of traffic issues. In this way, safety for drivers, efficiency and mobility can be increased with VANET but data between vehicles or between vehicle and infrastructure are included with private information. Therefore alternatives are necessary to secure privacy. If there is no alternative for privacy, it can not only cause some problems about identification information but also it allows attackers to get location tracking and makes a target. Besides, people's lives or property can be dangerous because of sending wrong information or forgery. In addition to this, it is possible to be information stealing by attacker's impersonation or private information exposure through eavesdropping in communication environment. Therefore, in this paper we propose Privacy Assurance Architecture for VANET to ensure privacy from these threats.

• Journal of Food Hygiene and Safety
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• v.29 no.1
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• pp.53-59
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• 2014

This study was carried out to investigate the effect on the growth and antioxidant activities of Cichorium intybus L.(CLE), Cichorium intybus L. var. folisum 'treviso' (CLET), Cichorium intybus L. var. folisum 'rosaitaliana' (CLER) in hydroponics added with $Cr^{3+}$ or Selenium (Se) for 4 weeks. Total polyphenol, total flavonoids contents and FRAP values of three species of chicory were grown hydroponically with $Cr^{3+}$ or Se were increased. These extracts were also showed stronger DPPH and ABTS scavenging activity than chicory extracts. In particular, chicories added with $Cr^{3+}$ had higher antioxidant activities than chicories added with Se. CLER and CLE extracts added with $Cr^{3+}$ were also showed ${\alpha}$-glucosidase inhibition activities. These results indicate that chicories were cultivated in culture fluid added with $Cr^{3+}$ or Se could be used as high functional vegetables.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.4
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• pp.12-19
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• 2014

A signal plan focused on vehicle traffic could easily overlook vulnerable priority signals, although the importance of vulnerable movements is increasingly recognized in recent years. Especially, the vulnerable are sometimes faced with dangerous situations when crossing roads with a signal plan based on design values of average, non-vulnerable persons. This study is focused on how to minimize the vehicle delay while simultaneously considering traffic flow and providing traffic safety by increasing road crossing time for pedestrians. For this purpose, a priority signal control strategy for the vulnerable, considering vehicle traffic flow, has been tested. Practical implication and a microscopic computer simulation has shown that the proposed method could provide a small decrease (about 6.2%) in pedestrian delay, a small increase (about 8.5~13.3%) in travel speed of passing traffic, and a considerable decrease (16.2~26.9%) in vehicle travel time. These findings suggest that the proposed signal control strategy could increase pedestrian safety and diminish delay of vehicle travel.

• The Journal of the Korea Contents Association
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• v.18 no.11
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• pp.484-492
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• 2018

This study examined the effects of field complexity and type of target objects on the performance in baggage screening task. A total of 62 participants(male: 45.2%, female: 54.8%) participated and their mean age was 22.88. The simulated baggage screening task was developed for this study and after the orientation and task exercises, main experiment session was conducted. Participants performed a total of 200 tasks and 40(20%) contained target object. The complexity was set at three levels: high, middle, and low levels and the number of background items contained 20, 14. and 8 respectively. The type of target was set as gun, knife, liquid, and righter. The dependent variables were hit ratio and reaction time. The results showed that the hit ratio decreased and reaction time increased significantly as field complexity increased, and they varied depending on the type of target. The hit ratio of the knife was the highest and liquid lowest and reaction time of the knife was the fastest and liquid slowest. In addition, the interaction effect was also significant. Knife was not affected by complexity, however, small item such as lighter was most affected by complexity.