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소프트콘택트렌즈 재질에 따른 눈물막 파괴시간과 고위수차의 비교
김봉환,한선희,김학준,배상아,손유진,김지현,김현지,Kim, Bong-Hwan,Han, Sun-Hee,Kim, Hak-Jun,Bae, Sang-A,Son, Yu-Jin,Kim, Ji-Hyun,KIm, Hyun-Ji 한국임상보건과학회 2019 한국임상보건과학회지 Vol.7 No.1
Purpose. In this study, two types of soft contact lenses with different materials were selected to compare the time of tear film destruction and high order aberrations before and after wearing. Methods. Thirty patients (60 eyes) in their 20s were included in this study. Two lenses with different materials, Group 4 (Etafilcon A) and Group 5 (Narafilcon A) were selected. Using aberration analyzer and keratometry, high-order aberration and tear film test (NIF-BUT, NIAvg-BUT) were performed before and after wearing. Results. When comparing the higher aberrations of the Etafilcon A and Narafilcon A lenses, the higher aberrations of the Narafilcon A lens were higher overall. For the initial tear film break-up time (NIF-BUT) after wearing, the Etafilcon A lens was reduced by 4.0 seconds and the Narafilcon A lens increased by 0.6 seconds. For the mean tear film break-up time (NIAvg-BUT) after wearing, the Etafilcon A lens decreased by 2.4 seconds and the Narafilcon A lens increased by 1.7 seconds. Conclusions. NIF-BUT and NIAvg-BUT of Narafilcon A lens were increased. The lens with relatively low water content and higher oxygen permeability than the lens with high water content has relatively less tear evaporation, which means that the time of destruction of the tear film is increased.
김봉환,한선희,박재만,이정수,정지환,윤남경,김형수,Kim, Bong-Hwan,Han, Sun-Hee,Park, Jae-Man,Lee, Jeong-Soo,Jeong, Ji-Hwan,Yoon, Nam-Kyung,Kim, Hyung-Soo 한국임상보건과학회 2021 한국임상보건과학회지 Vol.9 No.2
Purpose. This study categorizes vision correction subjects by age and gender, and aims to find out which glasses or contact lenses the subjects of each age group show preference based on the answers of the questionnaires answered by the subjects. Methods. A study was conducted in the form of a questionnaire through SNS on the types of correction tools used for the purpose of correcting ametropia for the general public from their teens to their 50s. Results. As for the most preferred method for correcting asymmetry, in the case of teenagers, glasses were the most common at 50%, glasses and contact lenses the most at 43.8% each, and glasses in their 30s at 50%. Those in their 40s had the most glasses at 75%, and those in their 50s wore glasses and sunglasses at 50%. Conclusions. Since the demand for vision correction and eye protection methods varies according to age and gender, it is necessary to identify and design the flow of these demands in the existing market. Therefore, it is necessary to make a judgment that can contribute to the development of eye health targeting the main customer base and the provision of appropriate services to consumers.
경남지역 대학생들의 난시 교정용 소프트 콘택트렌즈의 착용에 관한 설문조사
김봉환,한선희,김대현,변상현,채정임,김재석,황윤정,김학준,Kim, Bong-Hwan,Han, Seon-Hee,Kim, Dae-Hyeon,Byeon, Sang-Hyeon,Chae, Jeong-Im,Kim, Jae-Seok,Hwang, Yun-Jeong,Kim, Hak-Jun 한국임상보건과학회 2015 한국임상보건과학회지 Vol.3 No.3
Purpose. The actual status of wearing toric soft contact lenses was investigated to learn why it is not used although it is required. Materials and Methods. This study has studied 64 contact lens wearing the local college students, Gyeongsangnam-do who are 20.17(${\pm}0.70$)years old, by measuring their refractive power and over-refractive power with auto refractometer(HRK-8000A, Huvitz, Korea). In addition to that, a survey was done to figure out why they do not wear toric soft contact lenses, the purpose of using toric soft contact lenses, whether they have astigmatism or any knowledge about it, the kinds of contact lens, whether they are willing to buy corrective lenses, and how they are satisfied after purchasing them. Results. 17 students (21.9%) said they experienced light-spread; 9 students (14.1%)said that they have dizziness when they wear contact lens all day long. In the survey to see whether they had astigmatism or not, 37 students (57.8%) said they had it. For the reason they do not wear toric soft contact lenses, 33 students (51.6%) said that "they were prescribed regardless of astigmatism in the optometrist." To the question asking if they are willing to buy toric soft contact lenses according to the existence of astigmatism, 51 students (79.6%) answered they are. 31 students (48.4%) said they heard a description about astigmatism at the time of purchase for contact lens. Conclusion. As the ways for any people who need to correct astigmatism to wear corrective lens, enough education about astigmatism and consistent follow-up management are needed, where the role of optometrist is considered important.
김봉환,Kim, Bong-Hwan 대한수의학회 1982 大韓獸醫學會誌 Vol.22 No.2
A polyvalent live Escherochia coli oral vaccine were prepared by the use of 5 field isolates of enteropathogenic E. coli, serotypes 08 : K87, K88a, b ; 0138 : K81, K88a, c ; 0141 : K85a, b, K88a, b ; 0149 : K91, K88a, c and 0157 : K'V17', K88a, c. Some field experiments were conducted to investigate the effectiveness of the polyvalent live E. coli oral vaccine in the prevention of neonatal colibacillosis in piglets suckling orally vaccinated sows. Seventy-nine pregnant sows in an intensive pig farm were vaccinated with oral vaccine 4 weeks prior to farrowing and 19 sows were chosen for control. The piglets suckling vaccinated sows showed a significant protection against neonatal enteric colibacillosis during the 2 weeks observation period from the farrowing but no significant differences in protection between vaccinated and control group were observed with piglets older than 15 days.
경남지방(慶南地方)에서 발생(發生)한 젖소의 만성(慢性) 유방염(乳房炎)에 대한 연구(硏究)
김봉환,김진구,최상용,Kim, Bong-Hwan,Kim, Jin-Koo,Choe, Sang-Yong 대한수의학회 1983 大韓獸醫學會誌 Vol.23 No.2
Some investigations on chronic mastitis in dairy cattle in Kyungnam Province during the year 1982 were conducted with the special reference to the causative agents and their drug resistance. Milk samples from 46 isolated cases of chronic mastitis cattle were investigated bacteriologically and the organisms recovered were examined for their drug susceptibility against the major antibiotics used in this country by the use of disk diffusion susceptibility test. Four major causative agents involved in chronic mastitis were in order of prevalence Staphylococcus aureus (32.6%), Escherichia coli (28.3%), Streptococcus agalactiae (8.7%) and Candida albicans (8.7%). Staph. epidermidis, Streptococcus uberis, Klebsiella pneumoniae and Candida subtropicalis were found to be one of the minor agents. The majority of staphylococcal isolates were highly resistant to the most of antibiotics employed while 8% of them were resistant to gentamicin and 32% to chloramphenicol. The percentages of staphylococcal cultures resistant to penicillin, lincomycin. streptomycin, methicillin, oleandomycin, tetracycline, cephalothin, ampicillin and erythromycin were 100%, 96%, 96%, 92%, 84%, 84%, 80%, 76%, and 64% respectively. Streptococcal isolates were also highly resistant to the majority of the drugs used although 85.7% of them were susceptible to gentamicin. All Escherichia coli isolates were found to be resistant to erythromycin, lincomycin and penicillin while the majority of them were resistant to ampicillin (92.9%), carbenicillin (85.7%), oleandomycin (85.7%), streptomycin(85.7%), kanamycin (78.6%), methicillin (78.6%) and tetracycline (71.4%). The percentages of E. coli cultures resistant to gentamicin, nitrofurantoin, cephalothin and chloramphenicol were 21.4%, 21.4%, 35.7% and 50.0% respectively.
김봉환,김동성,이창구,Kim, Bong Hwan,Kim, Dong Sung,Lee, Chang Koo 대한수의학회 1981 大韓獸醫學會誌 Vol.21 No.2
Reproductive performance of gilts and sows in ordinary piggeries was investigated with special reference to litter size, piglets weaned per litter, the cause of preweaning mortality and the incidence of diarrhea. Biochemical properties of Escherichia coli isolated from piglets with diarrhea were also determined. The results obtained are summarised as follows: 1. Of the 2,226 gilts and sows farrowed, average number of piglets born alived and weaned piglets per litter were 8.9 and 7.1, respectively, indicating that both gilts and sows lost more than 20% of all their piglets prior to weaning. 2. The causes of preweaning mortality in order of prevalence were diarrhea (39.3%), pneumonia (20.0%), crushing (13.8%), starvation (11.0%) and born weak (10.3%). 3. Incidence of 3 diarrheal syndromes of piglets, i.e. 1 week diarrhea, 3 week diarrhea and post-weaning diarrhea were 18.4%, 66.1% and 15.5%, respectively, showing that most farms were suffering from so called 'white scours' in piglets 14~28 days old. 4. Biochemical properties of 268 cultures of E. coli isolated from diarrheal piglets were tested and compared with those of standard strains of porcine origin. All those properties of isolates were matched to standard E. coli teated while variable results were obtained with haemolytic capabilities of cultures tested. 5. Of 147 isolates 16 cultures (10.9%) were identified as colicin producers.