• Proceedings of the Korean Society of Computer Information Conference
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• 2023.07a
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• pp.197-198
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• 2023

드론 기술이 발전함에 따라, 최근에는 재난 구조 및 교통 관측, 과학 연구와 같은 분야에서 드론이 활용됨으로써, 사회적 및 산업적 발전에 일조하는 실정이다. 그러나 드론의 사용률이 증가하는 상황에서, 다양한 취약점을 내포한 드론으로 인하여, 심각한 보안위협이 발생하는 문제점이 존재한다. 이에 따라, 드론에서 발생하는 보안위협에 대응하기 위한 연구가 요구되며, 본 논문은 대응방안을 도출하기 위한 목적으로, 드론에서 발생 가능한 신규 취약점을 분석하고 실증한다. 본 논문에서 발굴한 신규 취약점은 A 드론을 대상으로, 기존의 다중 접속 취약점을 악용한 FTP 및 TELNET 접속 취약점이며, FTP 접속으로 암호화된 파일에 접근이 가능하고 TELNET 접속으로 루트 권한의 셸을 실행하는 신규 취약점을 발굴하였다.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.31 no.4
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• pp.510-520
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• 2021

Objective: This paper aimed to provide estimates the burden of cancer attributable to occupational exposures in South Korea and to review the processes of estimating the population attributable fraction(PAF). Methods: The PAFs of occupational cancer were reviewed from previous studies. The number and proportion of cancer cases attributable to occupational carcinogens were estimated by multiplying the PAFs by recent Korean cancer data(up to 2016 for incidence and 2017 for death) obtained from the Statistics Korea. The estimation of PAFs included occupational exposures defined as definite or probable human carcinogens by the International Agency for Research on Cancer. Results: In South Korea, an estimated 10,769 new cancer cases(9,017 among men, 1,752 among women) in 2016, and 7,030 cases of death from cancer(6,047 in men, 983 in women) in 2017, were attributable to occupational exposures, representing 1.5-4.7% of all new cancer cases(2.1-7.5% and 0.3-1.6% among men and women, respectively) and 2.7-8.9% of all cancer death cases(3.4-12.4% and 0.5-3.3% among men and women, respectively). Among men and women, lung cancer was the most impactful. The estimation process of PAFs, however, has a variety of uncertainties. Conclusions: Occupational exposures contribute to a substantial burden of cancer in South Korea. PAFs for cancer provide useful information for prevention initiatives and prioritizing health policies for workers. However, PAFs need to be interpreted cautiously and updated regularly.

• Applied Chemistry for Engineering
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• v.32 no.2
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• pp.132-138
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• 2021

This review investigated the types of physiologically active substances isolated and extracted from Pinus densiflora and koraiensis native to Republic of Korea, and the current status of research on their effectiveness and industrial use. They contain various bioactive substances including essential oils, polyphenols, resins, and stilbene derivatives. In recent, physiological activities such as antioxidant, anti-inflammatory, antibacterial, cataract prevention, and neuroprotection from extracts of Pinus densiflora and koraiensis have been identified by domestic researchers. The extracts have been used in different industrial fields like food, health functional foods, cosmetics, and household goods, but the high proportion of them is industrially made from exotic species. Therefore, various studies on industrial applicability are needed due to the lack of cases in which the activity is applied to actual products, with respect to the effects that have been scientifically recognized.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.54 no.6
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• pp.912-917
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• 2021

We investigated the distribution, molecular characteristics, and antimicrobial resistance of Vibrio vulnificus isolated from seawater at Gadeok Island, the Republic of Korea between June to October. Interestingly no isolates were detected between December to February. The detection rate of V. vulnificus was high (80-100%) from July to September 2019 and from June to September 2020. This coincided with the relatively low salinity of the seawater, which ranged from 7.8-29.9 practical salinity units for that period. Additionally, V. vulnificus had a high detection rate at sampling stations near the Nakdong river. The detection rates of virulence genes, such as vvhA, viuB, and vcgC, among the isolates were 97.1%, 44.1%, and 57.4% in 2019 and 100%, 43.0%, and 50.0% in 2020, respectively. Notably, viuB and vcgC were detected in V. vulnificus isolated between June to October when water temperature was above 20℃. The antimicrobial susceptibility analysis of 80 isolates revealed that most of the strains were susceptible to most antimicrobial agents. However, some isolates showed intermediate resistance to cefepime (18.8%), cefoxitin (58.8%), and erythromycin (22.5%). Of note, 3.8% of the tested strains were resistant to cefoxitin. The minimum inhibitory concentration of highly cefoxitin-resistant strains was determined to be less than 32 ㎍/mL.

• Korean Journal of Plant Resources
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• v.33 no.4
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• pp.404-416
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• 2020

Studies on the preservation and propagation of tropical and subtropical plants are required, but the studies are insufficient in Korea. Since 2013, the Tropical Plant Resources Research Center has been collaborating on field research and publication to preserve plant diversity in Myanmar protected areas and Sagging areas in cooperation with Ministry of Natural Resources and Environment Conservation and the Myanmar Forest Research Institute. This study is to provide information on cooperative projects. As a result of the joint research between the Korea National Arboretum and Myanmar, in December 2018, the Korea National Arboretum Tropical Plant Resources Research Center is on display for conservation and education purposes with the 65 Myanmar useful materials and specimens of 326 kinds of plants and specimens that Myanmar Forest Research Institute donated. This donation is the first case of Myanmar's export of plant organisms to a foreign country, and as for the Korea National Arboretum, it is the second official case of introducing a mass plant from foreign governments. The study will also accelerate preservation biodiversity and propagation methods of tropical and subtropical plants as well as research on biodiversity conservation and industrial use.

• Journal of Industrial Convergence
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• v.20 no.11
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• pp.135-140
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• 2022

A study to estimate the appropriate size for the quota of civil servants during the period of change of government is required. Therefore, in this study, we would like to introduce a study that uses DEA to estimate the appropriate size of public officials. The department of a public institution is DMU, and the number of employees in each department is applied as an input variable, and the number of electronic approval production documents and the number of electronic approval expenditures are applied as output variables. MaxDEA 8 was used as an analysis program for this purpose. As a result of the analysis, when the efficiency level was 1.00 (100%), 3 out of 14 departments showed the optimal level by satisfying the efficiency, and 10 of the remaining departments scored 0.50 (50%) with a score of 0.50 (50%), confirmed to be relatively inefficient. In other words, it was confirmed that most departments had inefficient surplus staff. As an additional analysis, we calculated the number of possible staff reductions using the efficiency level. Using this, it is expected that the field of manpower reduction can be discovered in advance through an analysis of manpower efficiency by department, and based on this, it can be used to relocate manpower by department according to future response strategies.

• Journal of the Korean Society of Industry Convergence
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• v.25 no.6_2
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• pp.1111-1117
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• 2022

Recently, interest in the circular economy has emerged in the industry. As a result, interest in Re-manufacturing, which makes old equipment similar to new products, is growing. In the machine tool industry with many aging equipment, the Re-manufacturing industry is essential, and among them, research on the performance improvement of gear type oil pumps was conducted. The purpose was to achieve the target performance of flow rate and volume efficiency by changing the shape of the gear pump housing clearance and inlet/outlet, and Computational Fluid Analysis and Central Composite Design were conducted using ANSYS CFX 2022 R2 and MINITAB®. The level of each determined factor was determined. 20 design points were derived, and the Flow Rate at each design point was calculated, and the Theoretical Flow Rate was calculated to obtain Volumetric Efficiency. The optimal design point was obtained when the Flow Rate was 140 lpm and the Volumetric Efficiency was maximum, the optimal design point was obtained when both were maximum, and the Surface Plot for each factor was obtained to identify the tendency.

• Journal of Digital Convergence
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• v.20 no.5
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• pp.463-476
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• 2022

After industrialization in the past, the automobile industry has continued to grow centered on internal combustion engines, but is facing a major change with the recent 4th industrial revolution. Most companies are preparing for the transition to electric vehicles and autonomous driving. Therefore, in this study, topic modeling was performed based on LDA algorithm by collecting 4,002 domestic papers and 68,372 overseas papers that contain keywords related to CASE (Connectivity, Autonomous, Sharing, Electrification), which represent future automobile trends. As a result of the analysis, it was found that domestic research mainly focuses on macroscopic aspects such as traffic infrastructure, urban traffic efficiency, and traffic policy. Through this, the government's technical support for MaaS (Mobility-as-a-Service) is required in the domestic shared car sector, and the need for data opening by means of transportation was presented. It is judged that these analysis results can be used as basic data for the future automobile industry.

• Korean Journal of Environmental Agriculture
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• v.42 no.4
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• pp.259-268
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• 2023

Rhodococcus sp. 3-2 strain has been reported to degrade benzimidazole-based pesticides, such as benomyl and carbendazim. Therefore, this study aimed to optimize culture medium composition and culture conditions to achieve cost-effective and efficient large-scale production of the Rhodococcus sp. 3-2 strain. The study identified that the optimal media composition for mass culture comprised 0.5% glucose, 0.5% yeast extract, 0.15% NaCl, 0.5% K₂HPO₄, 0.5% sodium succinate, and 0.1% MgSO₄. Additionally, a microbial agent was developed using a 1.5-ton fermenter, with skim milk (20%), monosodium glutamate (15%), and vitamin C (2%) as key components. The storage stability of the microbial agent has been confirmed, with advantages of low temperature conservation, which helps to sustain efficacy for at least six months. We also assessed the benomyl degradation activity of the microbial agent within field soil. The results revealed an over 90% degradation rate when the concentration of viable cells exceeded 2.65 × 10⁶ CFU/g after a minimum of five weeks had elapsed. Based on these findings, Rhodococcus sp. 3-2 strain can be considered a cost-effective microbial agent with diverse agricultural applications.

• Proceedings of the KIEE Conference
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• 2006.07a
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• pp.357-358
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• 2006

전력 산업이 자유화되고 경쟁을 통해 효율성을 증가시키려는 시도가 이루어지고 있다. 전력이 시장을 통해 거래되는 형태가 완전경쟁에 가까울수록 사회후생이 증가한다는 것이 알려져 있다. 하지만 발전 회사가 시장지배력을 행사하여 가격을 경쟁가격에서 벗어나게 함으로서 자신의 이익을 취하려 할 때 시장의 효율성은 감소하게 된다. 시장 지배력을 감소시키는 한 수단으로서 발전회사에 선도계약을 부과하는 방법이 있다. 발전 회사에 선도계약을 부과하는 방법을 사용할 때 어떤 회사를 선도계약 부과대상으로 삼을 것 인지와 계통의 송전제약 통에 대한 고려가 필요하다. 이에 대한 연구가 2모선 계통에 대해 게임이론의 혼합균형 개념을 통해 부분적으로 이루어져 있다. 본 논문에서는 3모선 계통에서 선도계약의 영향을 분석하고자 한다. 본 논문의 해석 결과에 의하면 3모선 계통에서도 선도계약은 상황에 따라 시장지배력의 감소 혹은 증가를 모두 불러올 수 있으며 기대사회후생에 부정적 영향 뿐 아니라 부정적 영향 역시 줄 수 있다.