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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,탁연빈,조길재,장희경,Kim, Bong-hwan,Tak, Ryun-bin,Cho, Gil-jae,Jang, Hee-kyung 대한수의학회 1991 大韓獸醫學會誌 Vol.31 No.4
Clinical and bacteriological observations on infectious atrophic rhinitis of swine were conducted in order to obtain some basic information for the clinical and immnnological control of the disease prevailing in the republic. Samples were collected from nasal cavities of 135 4~12 week old pigs from 12 herds and from turbinates of 199 slaughtering pigs from 14 swine herds to investigate the prevalence of Bordetella bronchiseptica and/or Pasteurella multocida in the nasal cavities of the pigs. On the examination of nasal swabs by cultural techniques and of gross lesion of snouts of slaughtering pigs, all the swine herds investigated were found to be affected by atrophic rhinitis and a total of 84 B bronchiseptica and 139 P multocida cultures were isolated from the nasal cavities of the pigs. Of the 199 slaughtering pigs, some 48% revealed gross pathological lesion typical of atrophic rhinitis and the prevalence of B bronchiseptica and P multocida were 27.6% and 46.7%, respectively. Biochemical properties, antimicrobial susceptibilities, serological characteristics and toxigenicity of the isolates of B bronchiseptica and P multocida were investigated.
SOI를 이용한 하드 디스크 드라이브용 정전형 트랙 추적 마이크로 액추에이터의 제작
김봉환,전국진,성우경,이효정,Kim, Bong-Hwan,Chun, Kuk-Jin,Seong, Woo-Kyeong,Lee, Hyo-Jung 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.8
0.3 g의 하드디스크 드라이브에 사용될 수 있는 마그네틱 헤드를 장착할 수 있는 트랙 추적용 마이크로 액추에이터를 제작하였다. 이 액추에이터는 정전방식을 적용하였으며 2${\mu}m$ 두께의 열산화막과 20${\mu}m$ 두께의 실리콘 막이 직접접합된 SOI 웨이퍼를 이용하여 단지 3장의 마스크만을 사용하여 제작하였다. 고유진동수는 18.5 kHz이고 15 V DC와 15 V AC 전압이 동시에 가해진 상황에서 그 변위가 1.4 ${\mu}m$이였고 이때 30 V일 때 50 N의 정전력을 나타내었다. 또한 2.21 kHz의 서보 주파수 대역에서 이득여유가 7.51 dB이고 위상여유가 50.98$^{\circ}$이였다. 따라서 이 트랙추적 마이크로 액추에이터는 10 Gb/in$^2$의 기록밀도를 요구하는 하드디스크 드라이브에 충분히 이용될 수 있을 것이다. We have achieved a high aspect ratio track-following microactuator (TFMA) which is capable of driving 0.3 ${\mu}m$ magnetic head for hard disk drive (HDD). it was fabricated on silicon on insulator (SOI) wafer with 20 ${\mu}m$ trick active silicon and 2 ${\mu}m$ thick thermally grown oxide and piggyback electrostatic principle was used for driving TFMA. The first vibration mode frequency of TFMA was 18.5 kHz which is enough for a recording density of higher than 10 Gb/in$^2$. Its displacement was 1.4 ${\mu}m$ when 15 V dc bias plus 15 V ac sinusoidal driving input was applied and its electrostatic force was 50 N. The fabricated actuator shows 7.51 dB of gain margin and 50.98$^{\circ}$ of phase margin for 2.21 kHz servo-bandwidth.