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      • KCI등재

        Retardation Free In-plane Switching Liquid Crystal Display with High Speed and Wide-view Angle

        강완석,문제욱,이기동,이승희,이준호,김병구,최현철 한국광학회 2011 Journal of the optical society of Korea Vol.15 No.2

        In this paper, we propose an in-plane switching (IPS) mode for liquid crystal displays (LCDs) that,in principle, is free of retardation of the LC cell. Basically, the optical configuration of the LC cell consists of an A-plate and an LC layer for switching between the dark and bright states. We could achieve a fast response time compared with the conventional in-plane LC cell because the free retardation condition of the proposed LC cell enables us to reduce the cell gap even by quarter-wave retardation without any change of the optimized LC material in the transmissive mode. Experiments for verification of the proposed in-plane switching LC cells have shown a significant reduction of the rising time and falling time simultaneously due to the small cell gap. Furthermore, we also proposed an optical configuration for wide viewing property of the retardation free IPS LCD by applying the optical films. We proved the wide-view property of the retardation free IPS LCD by comparing its optical luminance with the calculated optical property of the conventional IPS LCD.

      • KCI등재

        고분자 안정화 블루상 액정셀의 전기광학특성 향상을 위한 지그재그 형태 전극 설계

        강완석,문병준,이기동,Kang, Wan-Seok,Mun, Byung-June,Lee, Gi-Dong 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.1

        고분자 안정화 블루상 액정셀(Polymer-stabilized blue phase liquid crystal cell)은 ${\mu}s$ 단위의 응답속도와 광시야각 및 액정의 배향을 위한 문지름 과정이 필요 없는 장점이 있다. 그러나 높은 구동전압과 낮은 kerr 상수값으로 인해 유도되는 복굴절의 값이 낮아 고분자 안정화 블루상 액정셀의 전기광학특성을 저해하는 요인이 되었다. 본 논문에서는 지그재그 형태의 전극 구조를 제안하고 시뮬레이션을 통하여 제안된 전극 구조를 가지는 액정셀의 투과율 손실 없이 구동전압을 25%이상 낮출 수 있음을 확인하였다. The polymer-stabilized blue phase liquid crystal (BPLC) cell has advantages such as sub-millisecond response time, wide viewing angle and no rubbing process for the alignment of liquid crystals. However, high operating voltage and low kerr constant of the polymer-stabilized blue phase liquid crystal deteriorate the electro-optical characteristic of the polymer-stabilized BPLC cell. In this paper, we proposed novel zig-zag electrode in cell layout and confirmed that proposed electrode shape could reduce an over 25 percent of operating voltage for BPLC cell without degradation of tranmittance by using Kerr constant simulation.

      • KCI등재

        덧눈꺼풀 교정술이 난시의 개선에 미치는 영향

        강완석,안민.Wan Seok Kang. MD. Min Ahn. MD. PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.3

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Purpose: To evaluate the changes in visual acuity and astigmatism after epiblepharon surgery regarding preoperative age and astigmatism. Methods: We retrospectively reviewed the charts of 37 patients with epiblepharon surgery. Preoperative best-corrected visual acuity and degree of astigmatism were obtained. Postoperative data were collected at 6 and 12 months. Results: The mean patient age was 5.7 ± 2.5 years. In the 5-9 year-old group and ≤3D group, significant improvement of mean BCVA was demonstrated (p = 0.02, p = 0.039, respectively). In the cylinder groups, 1-2 D, 2-3 D, and ≤3D showed decreased mean astigmatism (p = 0.006, p = 0.034, p = 0.015, respectively). Conclusions: Significant astigmatic reduction was found after surgical correction in epiblepharon patients with higher baseline astigmatism. These results suggest that an epiblepharon surgery should be considered in patients with a high levels of astigmatism. J Korean Ophthalmol Soc 2014;55(3):343-347

      • KCI등재

        양악수술 후 발생한 코눈물관막힘 1예

        강완석,안민,Wan Seok Kang,Min Ahn 대한안과학회 2013 대한안과학회지 Vol.54 No.5

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Purpose: To describe a case of nasolacrimal duct obstruction after two-jaw surgery. Case summary: A 22-year-old woman presented with a 1-year history of epiphora after two-jaw surgery. Orbital CT showed 5 mm of focal soft tissue at the level of the distal nasolacrimal duct. Dacryocystography showed complete obstruction at the nasolacrimal duct level. Thus a nasolacrimal duct obstruction was diagnosed by physical and radiologic examination. Conclusions: In patients with epiphora who have undergone two-jaw surgery, precise examination and treatment is required in order to exclude nasolacrimal duct obstruction.

      • KCI등재

        당뇨병 환자에서 당뇨망막병증 중증도에 따른 눈물막의 변화

        강완석,최현태,안민,유인천,Wan Seok Kang,Hyun Tae Choi,Min Ahn,In Cheon You 대한안과학회 2014 대한안과학회지 Vol.55 No.4

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Purpose: To determine the relationship between changes in the tear film according to the classification of diabetic retinopathy in patients with diabetes. Methods: A total of 117 newly detected diabetic patients were included in this study. The classification of diabetic retinopathy was performed based on the Early Treatment Diabetic Retinopathy Study (ETDRS). The duration of diabetes and HbA1c were also investigated in patients who had undergone panretinal photocoagulation or insulin treatment. To examine the tear film function, we performed the tear break-up time test, the Schirmer I test, and the diagnostic fluorescein staining test of the ocular surface. The Cochet-Bonnet esthesiometer was also employed to examine the corneal sensitivity. Results: As the severity of diabetic retinopathy progressed, the degree of ocular surface fluorescein staining increased significantly. There was no relationship between the duration of diabetes and the results of the tear film function test. Patients who had high blood HgA1c levels showed significant increases in tear break-up time and degree of ocular surface fluorescein staining. The patients who had undergone panretinal photocoagulation showed significant differences in tear break-up time and degree of ocular surface fluorescein staining. Conclusions: The diabetic patients with progressed diabetic retinopathy, uncontrolled blood HgA1c levels and who had previously undergone panretinal photocoagulation should be managed more carefully since those patients are more susceptible to ocular surface disorder with aggravation of tear film function. J Korean Ophthalmol Soc 2014;55(4):486-492

      • KCI등재
      • KCI등재

        생쥐를 이용한 스테로이드 유발 고안압 모델

        김유라,강완석,권의용,조남천,이동욱,You Ra Kim,Wan Seok Kang,Eui Yong Kweon,Nam Chun Cho,Dong Wook Lee 대한안과학회 2014 대한안과학회지 Vol.55 No.8

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        Purpose: To determine whether rat eyes develop increases in intraocular pressure (IOP) in response to a topically applied corticosteroid and to investigate the relationship between ocular hypertension and apoptosis of retinal ganglion cells. Methods: IOP was monitored by rebound tonometry in a group of 10 rats that received topically administered dexamethasone in both eyes (experimental) and in another group of 5 rats that received artificial tears (control) three times daily for 4 weeks after the establishment of baseline IOP values. Only eyes that increased by more than 50% compared with the basal IOP were administered once per day for 5 weeks. After 8 weeks, selective immunofluorescence stain for retinal ganglion cells and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) stain were conducted. Results: Among 20 experimental eyes, 11 eyes (55%) showed a greater than 50% increase in IOP compared with basal IOP. After 8 weeks, the mean IOPs for the experimental and control groups were 11.8 ± 1.4 mm Hg and 18.5 ± 1.0 mm Hg, respectively (<em>p</em> < 0.01). The counts of central retinal ganglion cells (RGCs) were 2718 ± 240 and 2612 ± 443, respectively (<em>p</em> = 0.294). The results of the TUNEL stain also showed no differences. Conclusions: Rat eyes exhibit a steroid-induced ocular hypertensive response with no local complications. However, maintaining ocular hypertension increased by 50% for two months was not enough to detect changes in RGCs. J Korean Ophthalmol Soc 2014;55(8):1202-1207

      • KCI등재

        점안 인터페론 Alpha-2b로 재발을 억제한 재발 점액종성 각막변성 1예

        박영명,안민,강완석,유인천 대한안과학회 2017 대한안과학회지 Vol.58 No.8

        Purpose: To report a case of recurrent myxomatous corneal degeneration after pterygectomy. Case summary: A 65-year-old man with a history of abdominal keloid was referred to our hospital for assessment of a well-circumscribed, gelatinous, whitish corneal mass on the nasal corneal area of the left eye that appeared one month prior. The patient had undergone pterygectomy on his left eye 2 years ago. The patient experienced mild foreign body sensation. The other anterior segment and fundus examination of the left eye were both normal. We diagnosed the case as keloid and we performed excisional biopsy of the corneal mass. Histologic findings revealed proliferation of myxoid-appearing material in the anterior corneal stroma. On immunohistochemical examination, sections were stained positive for actin and calretinin, and negative for S-100. We diagnosed the tumor as myxomatous corneal degeneration. After six months, a recurrent mass was found on the previously excised site. Re-excisional biopsy and topical interferon α-2b treatment were then performed in response. After re-excision, there was no recurrence or complications during one year follow-up. Conclusions: Myxomatous corneal degeneration should be considered during differential diagnosis of an elevated, whitish, gelatinous lesion of the cornea with previous history of trauma or operation, such as pterygectomy. An interferon α-2b topical treatment is useful for recurrent corneal myomatous degeneration. 목적: 군날개 절제술 후 각막에 발생한 재발한 점액종성 각막변성 1예를 보고하고자 한다. 증례요약: 2년 전 좌안의 군날개 절제술을 받았으며, 복부에 켈로이드 소견을 보인 65세 남자 환자가 1개월 전 발생한 좌안 내측 각막의 종괴를 주소로 내원하였다. 좌안의 내측 각막에서 주위 조직과 경계가 뚜렷한 젤리 같은 백색의 종괴가 관찰되었고, 환자는 약간의 이물감을 호소하였다. 다른 전안부 검사 및 안저 검사는 정상이었다. 각막의 켈로이드로 의심하고 종괴에 대한 절제생검을 실시하였다. 병리조직학적 검사에서 각막 상부 기질에 점액질성 변성이 관찰되었고 면역염색검사상 S-100에 음성이고 Actin과 Calretinin에 양성 소견을 보여 각막 점액종성 각막변성으로 진단되었다. 6개월 뒤에 절제 부위의 각막 윤부에서 동일 성상을 가진 덩어리의 재발이 확인되었고 재절제한 후 Interferon α-2b 점안액을 추가 사용하여 치료하였으며 1년 경과까지 특별한 합병증이나 재발은 관찰되지 않았다. 결론: 군날개 수술과 같이 정상조직 손상 후에 발생한 각막의 젤리 같은 하얀 종괴에 대해서는 점액종성 각막변성을 감별진단으로 고려해야 하고 재발하는 경우에는 Interferon α-2b 점안도 도움이 될 수 있을 것으로 생각된다.

      • KCI등재

        Homeotropic Aligned Liquid Crystal Molecules in Dye-sensitized Solar Cells for High Efficiency

        김현경,허승열,강완석,이기동,진성호 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.5

        We optimized the alignment of the embedded liquid crystal (LC) molecular in quasi-solid state dye-sensitized solar cells (DSSC) to enhance the photovoltaic performance. The aligned LC molecular increases the ordering strength in the electrolyte so that it can provide a better pathway to transfer generated charges inside the polymer electrolyte. We performed experiments with three types of electrolytes, a typical polymer electrolyte, a polymer electrolyte with LC, and a polymer electrolyte with an aligned LC. The electro-optical characteristics obtained from these experiments were compared with each other for validation. We found that the aligned LCs in a polymer electrolyte can provide higher photovoltaic performance than conventional electrolytes.

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