지난 10년간 선박의 횡동요 복원력 상실에 의한 해양사고가 지속해서 증가하고 있어, 횡동요 운동을 효과적으로 줄일 수 있는 장치가 필요한 실정이다. 횡동요 감쇄 탱크는 단순한 설치만으로 횡동요 저감을 가져오는 대표적인 수동형 제어장치로 그 장점이 널리 알려져 있다. 따라서 본 연구에서는 U-튜브형 횡동요 감쇄 탱크의 수치해석 기법을 개발하고자 한다. 특히, 해석기법의 검증을 위해 자유 수면 높이를 실험을 통해 계측하였다. 수치해석기법은 메쉬 의존성, 난류모델 ( ,  , Reynolds Stress Model), 시간 간격 크기 및 반복 횟수 등의 영향을 비교하여 개발하였다. 최종적으로 개발된 해석기법은 Realizable  이 난류 모델에 10-2s 수준의 시간 간격 크기와 15 회의 반복횟수를 적용하였다. 2가지의 U-튜브형 감쇄 탱크의 조건에서 계측된 자유수면 높이를 이용하여 개발된 해석기법을 검증하였다. 본 연구의 수치해석은 RANS 기반 상용 해석 Solver인 STAR-CCM+ (ver. 17.02)을 이용하였다.

Curcumin is not soluble in water. Therefore, curcumin emulsion that can dissolve well in water were prepared using multi-emulsification technology, and the antioxidant activities and physical properties of emulsion were measured. Although curcumin was not dissolved in water, it was confirmed to be well dispersed in water when prepared in an aqueous dispersion curcumin emulsion. After dissolving curcumin using water and ethanol as solvents, respectively, the DPPH and ABTS radical scavenging abilities of the filtrate and the curcumin emulsion were measured. Because it was not dissolved in water, activities were not shown. However, when curcumin was dissolved in ethanol, the activities increased as the concentration of curcumin increased. On the other hand, when the curcumin emulsion was dissolved in water, it was found to have abilities. The curcumin emulsion was nano-homogenized and the size and distribution of the emulsified spheres were measured. It was confirmed to be nano-sized as it appeared as 9.083 nm/100%. In the results of the DPPH radical and ABTS radical scavenging abilities of curcumin nano-emulsion, it was confirmed that there was no change in the antioxidant abilities. In conclusion, water-dispersible curcumin prepared using multi-emulsification technology, and it was confirmed to exhibit antioxidant activity and emulsion stability.

On October 29, 2020, the Fifth Plenary Session of the 19th Central Committee of the Communist Party of China (CPC) pointed out that traditional and non-traditional security should be coordinated, and security development should be integrated into all areas and processes of national development. Terrorism as an escalating threat factor in non-traditional security issues, anti-terrorism has become an important component of maintaining social security and stability, safeguarding people's lives and implementing national security strategy. Focusing on the "14th five-year plan" and the overall national security concept, through analyzing the overall environment of China's current counter-terrorism intelligence, and using the PEST-SWOT model to probe into the strengths and weaknesses of China's counter -terrorism intelligence information security. A scientific and reasonable international coordination and Cooperation Mechanism of counter-terrorism intelligence is put forward to provide an important guarantee for the modernization of counter-terrorism intelligence system and adherence to the overall national security concept.

Imazosulfuron is globally considered as a relatively safe herbicide that controls plant growth by interfering with amino acid synthesis. It is stable, persists in the soil, and has low toxicity; however, studies about the toxic effects of imazosulfuron on non-targeted aquatic vertebrates are scarce. In this study, imazosulfuron was able to induce acute lethality on zebrafish embryos within 48 h. Imazosulfuron also had adverse effects on heartbeats and induced abnormal development with pericardial edema and scoliosis. Moreover, apoptosis and oxidative stress were increased by imazosulfuron in a dose-dependent manner. Thus, all our results showed that imazosulfuron has toxic effects on zebrafish embryogenesis.

Precedent research and development of personal armor and anti-stab wearing system has been conducted since 2018 as a part of the government-affiliated cooperative development project to create the best utilization of present technology and achievement according to the civil and military technical cooperation project promotion law. At present, the armor system operated by the ROK(Republic of Korea) military, the police, and the marine police is utilizing only basic armor using armor vests and plates. Therefore it is necessary to develop the personal armor and anti-stab wearing system which is suitable for various tasks in army with maximum protection capability. In this paper, we analyzed the study about international technologies, market trends of the developed countries and scope of research, utilization plan, R&D results for the best armor and anti-stab wearing system development.

PURPOSES: This study aimed to develop a proactive anti-icing system for driving zones at risk during winter. METHODS: An electric low power potable anti-icing system, operated with a battery and solar cell, was designed and fabricated. Potassium acetate was used as the anti-icing chemical. The developed anti-icing system was tested in the laboratory in advance to confirm its function. Potassium acetate was also tested both in the laboratory and outdoor (exposed to the sun) conditions. The anti-icing system was set up on the road for field testing. RESULTS: The 195 m spread distance of the anti-icing system was verified in the field test. CONCLUSIONS: The anti-icing system developed for safe driving on the road will be cost-effective and economical during installation and maintenance compared with currently used snow melting systems on vulnerable driving zones.

화랑곡나방 유충(Plodia interpunctella)에 대해 기피력을 갖는 팔각회향 에센셜 오일을 혼입한 폴리우레탄계 코팅액 제조 기술을 이용해 식품용 방충 다층필름 제작하고 유충에 대한 필름의 기피효과를 측정하였다. 방충 물질을 선정하기 위해, 총 9 종류의 에센셜 오일을 스크리닝하였으며 팔각회향이 가장 우수한 기피효과를 보였다. 이를 방충 물질로 선정하여 폴리우레탄계 코팅액을 제조하고, 제조된 코팅액을 polyethylene terephthalate 12 μm 필름 표면에 코팅하였다. 방충 물질이 코팅된 필름은 polypropylene 30 μm을 적층하여 다층필름으로 제조하였으며, 개발된 필름의 화랑곡나방 유충에 대한 기피력 측정이 진행되었다. 기피테스트 결과, 대조군 필름은 유충에 대한 기피 효과를 보이지 않은 반면 개발된 방충 필름은 보다 지속적인 기피 효과를 보였다. 따라서, 본 연구는 식품 포장재에 적용 가능한 표면코팅기술을 개발하고 그 방충 효과를 입증함으로써 식품 중 곤충 이물 저감화를 위한 식품포장기술 발전에 기여할 것이다.

2016년 4월부터 5월까지 20대부터 60대까지의 국내 성인 여성들을 대상으로 설문지 366부를 본 연구에 사용하였다. 천연 소재를 활용하여 항산화 맥주의 활용 가능성을 확인하고자 항산화 활성을 측정하였고, 항산화 수제 맥주에 대한 선호도 조사를 실시하였다. 연구 결과, 연구 대상자는 음주 인식에 대해 긍정적으로 확인되었으며, 국내 성인 여성들은 맥주에 대한 선호도가 높으며, 체력, 기분, 상황, 장소, 동행자 유형에 따라 음주 형태는 달라지는 것을 확인 할 수 있었다. 또한 주정으로 추출된 천연 소재에서 높은 항산화 활성 효과를 확인하였고, 수제 맥주 선호도 조사에서는 아로니아 열매를 첨가한 군이 전체적으로 높은 평가를 받은 것으로 확인되었다. 이와 같은 결과를 통해 국내 성인 여성 음주 및 항산화 맥주 개발에 대한 기초 자료가 될 것으로 사료되어진다.

식품 포장재 내 곤충 침입을 방지하기 위해 방향유를 함유한 방충 필름이 연구되고 있으나 파일럿 규모의 생산 장비를 이용한 연구는 드물다. 따라서 본 연구의 목적은 파일럿 규모의 생산 장비로 미세캡슐화된 시나몬방향유(cinnamon oil, CO) 함유 식품 포장 필름을 개발하고 필름의 방충효과와 이화학적 특성을 평가하는 것이었다. 모든 필름은 파일럿 규모의 그라비아 인쇄기(Roto Gravure Printing Press, Ilsung Machinary Co., Ltd., Gumi, Korea)와 적층기(Dry laminating & Extrusion laminating machine, INT CO., Ltd; Ansan, Korea)로 제작되었다. 폴리비닐알코올 수용액(0.02%, w/w, 폴리비닐알코올/증류수)을 사용하여 CO (5.2%, w/w, CO/PVA 수용액) 미세캡슐 에멀션을 제조하였고, 0,1 또는 2% (w/w, CO/미세캡슐 CO 에멀션)의 미세캡슐 CO 에멀션을 잉크(54 또는 61%, w/w, 잉크/전체 혼합액)와 시너(thinner) (23 또는 26%, w/w, 시너/전체 혼합액)에 혼합하여 인쇄 용액을 만들었다. 만들어진 용액을 폴리프로필렌필름(30 μm)에 그라비아 인쇄기로 인쇄한 후, 인쇄된 면에 저밀도폴리에틸렌 필름(40 μm)을 올려놓고 적층(lamination)하여 방충 필름(75 μm 두께)을 제작하였다. 소규모와 파일럿 규모로 진행된 필름의 방충효과 측정에는 화랑곡 나방(Plodia interpunctella) 유충을 사용하였고, 개발된 필름의 시남알데하이드 방출률, 인장 및 수분 차단 특성 그리고 열 중량을 분석하였다. 파일럿 규모 인쇄기와 적층기는 미세캡슐 CO 에멀션이 사용된 방출필름을 연속적이고 균일하게 생산하였다. 미세캡슐 2% CO 에멀션 제형으로 제작된 필름이 가장 높은 방충능을 보였으며, 미세캡슐화가 방충효과를 유지하면서 시남알데하이드의 보존성을 높여 방충효과를 유지하는 데 효과적임을 알 수 있었다. 열 중량분석 결과를 통해 미세캡슐화와 적층이 CO의 휘발을 막는 데 효과적임을 확인했다. 필름의 인장강도, 신장률, 탄성률 그리고 수증기 투과성은 각각 40.4-45.4 MPa, 87.1-87.6%, 831.8-838.1 MPa, 그리고 0.0078-0.0082 g·mm·h-1·kPa-1·m-2이 었으며, 이 결과들은 개발된 방충 필름의 인장 및 수분특성에 변화를 주지 않는 것으로 관찰되었다(p>0.05). 연구를 통해 파일럿 플랜트 규모에서 방충 필름을 성공적으로 제작할 수 있었고, 방충효과와 이화학적 특성 결과를 통해 제작된 방충 필름의 상업적 적용 가능성을 확인할 수 있었다.

Insect infestation leads to huge loss of agricultural products and transmission of vector-borne diseases causing millions of deaths per annum. Juvenile hormone (JH) controls the development and reproduction of insects, therefore the grouth of insects can be inhibited by interfering the action of JH. Based on this, we developed a novel insect species-specific screening system to identify juvenile hormone antagonists (JHANs) from natural origin. These compounds can disrupt JH-mediated insect development by interfering the binding of a heterodimer, steroid receptor coactivator (SRC), with its partner protein, the methoprene-tolerant (Met) JH receptor. This screening system could be used as a new tool to develop eco-friendly and species-specific insecticides.

The objective of this study was to develop anti-browning agents for commercial ready-to-eat pear products, which are preferred not only to maintain the flavor, color and texture of pears, but also to increase consumers’ preference. The sliced ‘Shin-go (Niitaka)’ pears were immersed in 5% and 10% oxidized starch, 1% citric acid, and 5% and 10% oxidized starch with addition of 0.1% sucralose for 3 minutes, and then they were packaged in vacuum sealed bags at 1℃ for 9 days. In order to evaluate the quality of packaged sliced pears, the quality index was determined in terms of color, firmness, soluble solids, and sensory quality. With the passage of storage time, no specific variation in firmness and soluble solids was observed. However, the ΔE value of the sliced pears treated with 5% oxidized starch solution was significantly lower than that of the other pears. Also, the Hunter L and b values of the sliced pears treated with 5% oxidized starch solution remained nearly constant from the beginning of storage. This observation shows that 5% oxidized starch solution was effective in reducing surface browning of sliced pears. Moreover, sliced pears treated with oxidized starch solution with addition of 0.1% sucralose were given an overall liking score which was slightly higher than that given to the other pears because of the sweetness of sucralose. In conclusion, 5% oxidized starch solution with addition of 0.1% sucralose was effective in reducing browning of sliced pears and in improving the taste of sliced pears.

The topic of school bullying has been seriously reported and discussed in Korea from the mid-1990s, with the several suicidal cases of bullying victims were reported. Korean government has dealt systematically with the problem of school violence and bullying, and established a series of corresponding system that covers prevention, reporting, and follow-up of a school violence act. This study purports to review the development of Korea's school anti-bullying policies and investigate their limitations as a process evaluation. After the School Violence Act was enacted in 2004, several countermeasures has been arranged systematically. The legislation stipulated that victims must report their cases to the school authorities or the police, and school districts are mandated to organize an Autonomous School Violence Solution Committee. The 117 School Violence Report Center was enlarged and School Police Officer program was adopted. The prevalence rate of school violence in Korea had been decreased after 2012. It can be said that the overall occurrence of school violence have reduced but school violence still occurs among a significant portion of students. Even if visible incidence of school violence has decreased, not only the emergence of new types of school violence but also the invisibility and severity of school violence can be strengthened. And in dealing with the school violence cases, the ambiguity of the criteria on the identification of school violence and bullying and arbitrariness of decision making process can be problematized. The judgments on punishment should be made in precluding the arbitrariness of individuals as much as possible and in accordance with the unified detailed instructions. In order to execute the anti-bullying policy more effectively, there is a need to pay attention to the problems that appeared in its policy implementation processes.