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ACF와 활성탄을 이용한 톨루엔과 IPA의 흡/탈착 성능특성
변용수 ( Yong Soo Byun ),정석우 ( Seok Woo Chung ),유상오 ( Sang Oh Yoo ),유문하 ( Mun Ha Yu ),전동환 ( Dong Hwan Jun ) 한국공업화학회 2009 응용화학 Vol.13 No.1
대기오염의 원인물질중의 하나인 VOC는 대기중 이동성이 강하고 악취를 유발할 뿐 아니라, 마취성이 강하다. 또한, 신경계에 독성물질로 작용하며, 벤젠, PAHs 등의 물질은 발암성을 가지고 있어 환경보건상 유해하기 때문에 VOC감축과 제어를 대기질 관리의 주요정책수단으로 설정하는 국가가 증가하는 추세이다. 본 실험은 현재 진행중인 저농도 VOC 농축/산화시스템의 성능평가연구 개발과제에서 농축/산화시스템에 적용 할 흡착제의 선정 및 성능평가를 위해 진행하였다. 실험결과 실험에 사용된 흡착제 ACF증 A-15모델의 흡/탈착 성능특성이 가장 우수한 것을 알 수 있었으며 탈착실험결과 흡착되었던 VOC가 공급시 농도에 비하여 10배 이상으로 농축되어 촉매연소가 가능함을 확인할 수 있었다.
변용수,김수영,박영훈,이영춘,Yong Soo Byun,M,D,Su Young Kim,M,D,Young Hoon Park,M,D,Young Chun Lee,M,D 대한안과학회 2008 대한안과학회지 Vol.49 No.4
Purpose: We compared the efficacy of applying mydriatics to the conjunctiva of the lower eyelid by using a cotton-tipped applicator with an eye-dropping method. Methods: Thirty children under 16 years of age (60 eyes) and 30 adults more than 20 years old (60 eyes) were randomly chosen. Mydriatics were applied to each eye using an eye-dropping method for one eye and a conjunctival application method using a cotton-tipped applicator for the other eye. Pupil size was measured before applying mydriatics, immediately and at 30 and 60 minutes after application. Also, we investigated the degree of discomfort. Results: In the children, the pupil size in the eye dropping group and the conjunctival application group were each 8.01±0.57 mm and 7.97±0.57 mm at 60 minutes after applying mydriatics (P=0.07). In the adults, the pupil size was 7.94±0.59 mm in the eye-dropping group and 7.89±0.55 mm in the conjunctival application group at 60 minutes after applying mydriatics (P=0.074). In terms of degree of discomfort, the adults found the conjunctival application method to be significantly more unpleasant than the eye-dropping method at each three applications (P=0.001, 0.001, 0.001). Conclusions: The conjunctival application method using a cotton-tipped applicator has an equal effect in terms of mydriasis compared to the eye-dropping method. It is convenient to use in children and in the elderly who show less compliance. Also, this new method reduces systemic absorption of the medication. Therefore, the conjunctival application method is a good substitute for the conventional methods for mydriasis.
변용수,신소정,양석우,Yong Soo Byun,So Jung Shin,Suk-Woo Yang 대한안과학회 2008 대한안과학회지 Vol.49 No.4
Purpose: To report a case of Charles Bonnet syndrome in a patient who developed phantom vision of an enucleated eye. The patient had lost her vision because of a chemical burn 10 years previously. Case Summary: A 37-year-old woman received enucleation of one eye because ocular pain and phthisis had developed due to a chemical burn that occurred 10 years previously. On the first postoperative day, she complained of phantom vision in the enucleated eye. The image she described was like sparkling bubbles. She had recognized the image was not real, and no psychological problems were found during pre- and postoperative periods. Her wound state was good, so she is currently wearing an artificial eye, though her phantom vision intermittently returns. She has adapted to her phantom vision such that she now rarely feels discomfort. Results: Charles Bonnet syndrome is a visual hallucination that occurs among the blind or those who are visually impaired. Besides ophthalmologic care, sociological and psychological care should be considered.
안구건조증 환자에서 사이클로스포린 0.05% 점안액의 임상효과
변용수,전은정,정성근.Yong Soo Byun. M.D.. Eun Jeong Jeon. M.D.. Ph.D.. Sung Kun Chung. M.D.. Ph.D. 대한안과학회 2008 대한안과학회지 Vol.49 No.10
Purpose: We conducted a study to evaluate the change of tear secretion and symptoms in the patients with dry eye syndrome after using Restasis<sup>® (Cyclosporine 0.05% ophthalmic emulsion, Allergan Inc., U.S.A.). Methods: We randomly selected 39 patients from newly or previously diagnosed dry eye syndrome patients and administered Restasis<sup>® to them. We checked their clinical parameters and symptoms over a period of 3 months. The clinical parameters evaluated were type I and type II Schirmer tests and tear break-up time, and the symptoms of dry eye syndrome were classified into pain, itching, foreign body sensation, blurred vision, and photophobia using a scoring scale for symptoms of 0 to 5. The results were analyzed with a Mann-Whitney test (P-values <0.05 was considered statistically significant). Results: For 26 of 39 patients (52 eyes) on whom all tests were carried out for 3 months, there was a significant improvement after 3 months in the type I Schirmer test, type II Schirmer test, and tear break-up time (P=0.012, 0.009, 0.001, respectively). Only 14 patients completed the questionnaire for scoring of symptoms. After using Restasis®, foreign body sensation only improved (P=0.010). Conclusions: In our study, tear secretion was increased by Restasis<sup>®, and a greater increase in tear secretion was seen in patients with systemic disease than in patients without systemic disease. Additional patients need to be evaluated and longer-term studies need to be performed to confirm our results. J Korean Ophthalmol Soc 2008;49(10):1583-1588
김창남,변용수,김정만,김의간,Kim Chang-Nam,Byun Young-Su,Kim Jeong-Man,Kim Ue-Kan 한국마린엔지니어링학회 2006 한국마린엔지니어링학회지 Vol.30 No.1
In order to compute the radiated sound from a vibrating structure, the Rayleigh's integral equation has to be derived from the Helmholtz equation using Green's function. Generally, the surface velocity in the Rayleigh's integral equation uses the root mean square(rms) velocity. The calculation value is too large, because it's not considered cancelation. On the other hand. using the complex velocity, the sound pressure is calculated too small, because it considers that sound is perfectly canceled out. Therefore, this thesis proposes a correction factor(CF) which considers vibration modes and the method by which to calculate the radiating sound pressure. The theoretical results are compared with the experimental values, and the proposed method can be verified with confluence.