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The Effect of Texting Using a Smart Phone While Driving on Drivers
Sang-Hyeok Seo,Seung-Hyun Kwak,Hyung-Sik Kim,Soon-Cheol Chung,Doo-Hwan Ji,Jin-Kyu Kang,Byung-Chan Min 대한인간공학회 2014 대한인간공학회 학술대회논문집 Vol.2014 No.5
This study was aimed to find out whether there was some difference comparing lane separation distance, brake reaction speed between a smart phone and a button type of general phone while driving in a driving environment using a driving simulator. The subjects were composed of 10 males in their twenties, the road situation of three-lane road was copied as a driving environment, and the subjects were instructed to keep 50m lane distance from the car ahead, driving with a constant speed of 70km/h. In this driving condition, the subjects were instructed to send the contents of given text message with a smart phone and a general phone respectively. As a result of test, in brake reaction rate, it increased with a significant difference(p>0.05) when sending a text message with a smart phone compared with when not sending a text message. The above results suggest that sending a text message can damage the driving performance capacity and especially when sending a text message with a smart phone based on a touch screen, as the visual distraction increased compared with a general phone and the brake reaction rate increased, it is considered that riskiness is high.
Kwak, Kyu-Won,Han, Myung-Sae,Nam, Sung-Hee,Park, Kwan-Ho,Kim, Eun-Sun,Lee, Seokhyun,Song, Myung-Ha,Kim, Wontae,Choi, Ji-Young Korean Society of Sericultural Science 2016 International Journal of Industrial Entomology Vol.33 No.1
Beauveria bassiana is a common fungal pathogen of Protaetia brevitarsis larvae, and although it is less common than Metarhizium anisopliae , the pathogen still poses a great risk to humans and animals that consume infected insects, owing to B. bassiana's production of toxins like beauvericin and mycotoxin. Interestingly, the beneficial microorganism Saccharomyces cerevisiae possesses antifungal properties. In the present study, we found that S. cerevisiae inhibited the growth of B. bassiana by 97% and that S. cerevisiae failed to harm P. brevitarsis when administered via intracoelomic injection (1×10<sup>7</sup> cfu/mL). In addition, we also found that S. cerevisiae consumption increased the survival time of percutaneously infected P. brevitarsis larvae by 5 d and reduced the mortality of infected larvae by 12%. Therefore, S. cerevisiae is expected to be useful in the prevention and control of B. bassiana in the production of P. brevitarsis larvae.
( Kyu Won Kwak ),( Myung Sae Han ),( Sung Hee Nam ),( Ji Young Choi ),( Seok Hyun Lee ),( Young Cheol Choi ),( Kwan Ho Park ) 한국잠사학회 2014 International Journal of Industrial Entomology Vol.28 No.2
Protaetia brevitarsis seulensis (Kolbe) is widely used in Korea, as a protein-rich, alternate, functional food with pharmacological benefits. In addition to anti-oxidant properties, the larvaeof P. b. seulensis also show positive effects against hepatic disorder and diabetes; therefore, P. b. seulensis larvae are being reared on a large scale in Korea. We evaluated reared larvae of P. b. seulensis from Gyeong-gi in Korea. Using 16SrRNA PCR, electro-microscopy, and bioassay techniques, we found that the larvae harbored Spo-1, a bacterium identified as the insect pathogen Serratia marcescens. Therefore, we highlight the use of this insect as an alternate food and the need for its sanitary rearing conditions, as contamination may affect public health.
( Kyu-won Kwak ),( Sung-hee Nam ),( Kwan-ho Park ),( Heuisam Lee ),( Myung-sae Han ) 한국잠사학회 2018 International Journal of Industrial Entomology Vol.37 No.1
Bacterial species, Bacillus amyloliquefaciens and Lactobacillus species (L. sp.5-1), are known to inhibit the growth of pathogenic bacteria and fungi. Metarhizium anisopliae is a pathogenic fungal species which causes fatal damage to P. brevitarsis populations. Therefore, we investigated the inhibitory effect of B. amyloliquefaciens and L. sp. 5-1 on M. anisopliae induced fatality rates in P. brevitarsis. Samples of M. anisopliae -infected sawdust were treated with strain B. amyloliquefaciens KACC10116, strain L . sp. 5-1 KACC19351, and a combination of the two. P. brevitarsis were fed treated sawdust samples, and their subsequent fatality rate was monitored. The fatality rate fell below 1.5% after 10 days and decreased by approximately 40% after 15 days. On average, the fatality rate decreased by 20%, compared to the control. The difference in the decrease in fatality rate between B. amyloliquefaciens treatment and L . sp. 5-1 treatment was not significant. Results indicate that both strains exhibit high anti-fungal activity, which may be useful in environmental purification efforts. These strains may be used for effective prevention of fungal infection in P. brevitarsis.
Kwak, Dong-Joo,Moon, Byung-Ho,Lee, Don-Kyu,Park, Cha-Soo,Sung, Youl-Moon The Korean Institute of Electrical Engineers 2011 Journal of Electrical Engineering & Technology Vol.6 No.5
In this study, we investigate the photovoltaic performance of transparent conductive indium tin oxide (ITO), titanium-doped indium oxide (ITiO), and fluorine-doped tin oxide (FTO) films. ITO and ITiO films are prepared by radio frequency magnetron sputtering on soda-lime glass substrate at $300^{\circ}C$, and the FTO film used is a commercial product. We measure the X-ray diffraction patterns, AFM micrographs, transmittance, sheet resistances after heat treatment, and transparent conductive characteristics of each film. The value of electrical resistivity and optical transmittance of the ITiO films was $4.15{\times}10^{-4}\;{\Omega}-cm$. The near-infrared ray transmittance of ITiO is the highest for wavelengths over 1,000 nm, which can increase dye sensitization compared to ITO and FTO. The photoconversion efficiency (${\eta}$) of the dye-sensitized solar cell (DSC) sample using ITiO was 5.64%, whereas it was 2.73% and 6.47% for DSC samples with ITO and FTO, respectively, both at 100 mW/$cm^2$ light intensity.
Kwak, Kyu-Won,Nam, Sung-Hee,Park, Kwan-Ho,Lee, Heuisam,Han, Myung-Sae Korean Society of Sericultural Science 2018 International Journal of Industrial Entomology Vol.37 No.1
Bacterial species, Bacillus amyloliquefaciens and Lactobacillus species (L. sp.5-1), are known to inhibit the growth of pathogenic bacteria and fungi. Metarhizium anisopliae is a pathogenic fungal species which causes fatal damage to P. brevitarsis populations. Therefore, we investigated the inhibitory effect of B. amyloliquefaciens and L. sp. 5-1 on M. anisopliae induced fatality rates in P. brevitarsis. Samples of M. anisopliae-infected sawdust were treated with strain B. amyloliquefaciens KACC10116, strain L. sp. 5-1 KACC19351, and a combination of the two. P. brevitarsis were fed treated sawdust samples, and their subsequent fatality rate was monitored. The fatality rate fell below 1.5% after 10 days and decreased by approximately 40% after 15 days. On average, the fatality rate decreased by 20%, compared to the control. The difference in the decrease in fatality rate between B. amyloliquefaciens treatment and L. sp. 5-1 treatment was not significant. Results indicate that both strains exhibit high anti-fungal activity, which may be useful in environmental purification efforts. These strains may be used for effective prevention of fungal infection in P. brevitarsis.
Prevalence of Oryctes rhinoceros nudivirus disease in Allomyrina dichotoma in Korea, 2018
Kyu-Won Kwak,Heui-Sam Lee,Myung-Sae Han,Sung-Hee Nam,Kwanho Park 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
Allomyrina dichotoma (order Coleoptera, family Scarabaeidae) is used for development of pharmaceuticals, pet or educational purposes and animal feedstuffs. The disease occurrence and distribution of Oryctes rhinoceros Nudivirus were investigated in Allomyrina dichotoma in Korea using PCR and analyzed the DNA seqeunces using BLAST(Basic Local Alignment Search Tool). The virus infected larvae were collected from 10 insect rearing farms in five different regions (Gyounggi, Chungbuk, Chungnam, Jeonnam, Daejeon). Frequency of OrNV virus infection appeared differently depending on the regions or rearing facilities (open field, vinyl house, indoor breeding system and etc.). The collected samples of Allomyrina dichotoma raised on open fields showed the highest possibilities of OrNV virus infection. The OrNV average infection rate of open fields rearing systems was 50.0%.