하드디스크 드라이브에서의 소음 저감에 관한 연구

곽주영(Joo Young Kwak),손진승(Jin Seung Sohn),이행수(Haeng Soo Lee),홍민표(Min Pyo Hong),고정석(Jeong Seok Koh),조은형(Eun Hyung Cho),좌성훈(Sung Hoon Choa) 한국소음진동공학회 2001 한국소음진동공학회 학술대회논문집 Vol.2001 No.11

개방성 안구손상 환자의 시력 예후 인자와 안외상점수의 예측도

이연희,곽주영,이성복,Yeon Hee Lee,MD,Joo Young Kwag,MD,Sung Bok Lee,MD,PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.6

Purpose: To determine the prognostic factors of visual outcome in open globe injury and to assess the possibility of an ocular trauma score (OTS) model of predictive value in open globe injuries in Koreans. Methods: The medical records of 242 patients with open globe injury from 2000 to 2010 were retrospectively reviewed. Prognostic factors of visual outcome, positive predictive rate, and negative predictive rate were surveyed. Results: In the multivariate analysis, old age, relative afferent pupillary defect, impaired initial visual acuity and retinal detachment were the worst predictive factors of vision survival. In OTS categories 1 and 2, worse final visual acuity was acquired, and positive predictive rate and negative predictive rate for assessment of final visual acuity less than 0.02 were 70.1% and 89.8%, respectively. Conclusions: The prognostic factors of open globe injury associated with impaired final visual acuity were old age, relative afferent pupillary defect, worse initial visual acuity, retinal detachment and OTS categories 1 and 2. The OTS may have prognostic value in open globe injuries in Korean patients. However, identified prognostic factors of the present study did not entirely coincide with those of other Koreans or previous studies. Therefore, additional studies on the modified open globe injury as a prognostic model in Korean patients are needed. J Korean Ophthalmol Soc 2012;53(6):825-832

HDD 디스크-스핀들 시스템의 동특성 개선에 관한 연구

좌성훈(Sung Hoon Choa),손진승(Jin Seung Sohn),이행수(Haeng Soo Lee),홍민표(Min Pyo Hong),고정석(Jeong Seok Koh),곽주영(Joo Young Kwak),조은형(Eun Hyung Cho) 한국소음진동공학회 2001 한국소음진동공학회 학술대회논문집 Vol.2001 No.6

안와 외상 후 발생한 하사근 기능항진 환자 1예

이성복,곽주영,이연희,Sung Bok Lee,MD,PhD,Joo Young Kwag,MD,Yeon Hee Lee,MD 대한안과학회 2011 대한안과학회지 Vol.52 No.5

Purpose: To report a case of inferior oblique muscle overaction after orbital trauma. Case summary: A 19-year-old male presented with a blowout fracture of the right inferior orbital wall. The patient had no history of facial asymmetry, head tilt, strabismus or diplopia. The day after the reduction operation, the patient complained of diplopia on the down-gaze. The patient had orhthophoria in the primary position. However, the right eye showed a limitation on infraduction. Six weeks later, the limitation of infraduction resolved, however the diplopia worsened. The right eye showed excessive elevation in adduction and hypertropia in the primary position. The hypertropia increased on left gaze, and decreased on right gaze. Bielschowsky’s head test revealed a negative result. The fundus photographs showed a mild excyclotorsion of the right eye. Five months later, the symptoms and signs were stable and surgery was performed. Under general anesthesia, the exaggerated forced duction test and traction with strabismus hook on the right inferior oblique muscle revealed tightness. The inferior oblique muscle was found to be recessed. After the operation, the diplopia, hypertropia and the excessive elevation on adduction of the right eye resolved. Conclusions: A contracture and resultant overaction of inferior oblique muscle could develop after trauma on the inferior orbital wall. Trauma on the inferior orbital wall should be considered as one of the primary causes of acquired inferior oblique overaction. J Korean Ophthalmol Soc 2011;52(5):639-643

라식수술 후 백내장수술 시에 Shammas-PL 공식을 이용한 인공수정체도수계산

박세영(Se Young Park),곽주영(Joo Young Kwag),최진석(Jin Seok Choi),박규홍(Kyu Hong Pak),정성근(Sung Kun Chung) 대한안과학회 2021 대한안과학회지 Vol.62 No.2

목적: 라식수술 과거력이 있는 환자의 백내장수술 시에 Shammas-PL 공식을 이용했을 때 인공수정체도수계산 방법을 알아보고자 한다. 대상과 방법: 2018년 9월부터 2019년 9월까지 본원에서 백내장수술을 시행한 환자 중 라식수술의 과거력이 있는 환자 29명 41안을 대상으로 하였다. 수술 전 안축장, 전방깊이, 각막곡률을 측정하였고, 인공수정체도수계산은 가장 많이 사용되고 있는 Shammas-PL (post laser in-situ keratomileusis, post LASIK) 공식을 이용하였다. 수술 전 굴절예측치와 수술 후 현성굴절검사값을 이용하여 평균 절대오차와 평균산술오차를 구하여 정확도를 파악하였다. 결과: 전체 41안 중 15안(36.6%)에서 수술 전의 굴절예측치와 비교해서 수술 후 상대적으로 원시로 이행되었고, 25안(61%)에서 상대적으로 근시 이행을 보였으며, 1안(2.4%)은 수술 전 굴절예측치와 동일하였다. 백내장수술 전 굴절이상치는 수술 후 근시, 정시, 원시의 이행과는 관련성이 없었다(p>0.05). 평균절대오차는 0.63 ± 0.57 diopter (D)였고, 원시로 이행한 경우의 평균절대오차는 0.41 ± 0.35 D, 근시로 이행한 경우의 평균절대오차는 0.78 ± 0.63 D였다. 결론: 라식수술 후 백내장수술 시에 Shammas-PL 공식을 이용하여 인공수정체도수계산을 했을 때 술 후 근시로 이행하는 경우가 더 많았고, 원시로 이행한 경우보다 근시로 이행한 경우의 평균절대오차가 더 컸으므로 목표 굴절예측치보다 더 원시쪽으로 인공수정 체도수를 결정하는 것이 좋을 것이다. Purpose: To calculate the intraocular lens (IOL) power using the Shammas-PL formula after laser in-situ keratomileusis (LASIK). Methods: Forty-one eyes of 29 patients that had undergone cataract surgery from September 2018 to September 2019 after LASIK were enrolled in this study. A preoperative AL-Scan?? (Nidek Co., Gamagori, Japan) was used to measure the axial length, anterior chamber depth, and corneal curvature. An IOL power calculation was performed using the Shammas-PL (post LASIK) formula. Mean absolute error (MAE) and mean arithmetic error (MARE) were calculated using preoperative manifest refraction and postoperative manifest refraction. Results: Of the 41 eyes, 15 eyes (36.6%) were relatively hyperopic-shifted after surgery compared to the predicted refractive error before surgery, 25 eyes (61%) showed a relative myopic shift, and one eye (2.4%) showed no change with respect to the previous refractive predicted error. Refractive errors before cataract surgery were not related to myopic, emmetropic, or hyperopic shifting after surgery (p > 0.05). Conclusions: When cataract surgery using the Shammas-PL formula was performed after LASIK, myopic shifting was more common than hyperopic shifting. The MAE was greater in myopic-shifted cases than that of hyperopic-shifted cases. Thus, it is better to determine IOL power toward the hyperopic side than the target refractive prediction.

인공 삽입물을 이용한 안와골절 수술 후 급성으로 발생한 안와농양 1예

정상문,임재석,박도훈,곽주영.Sang Moon Jeong. M.D.. Jae Seok Yim. M.D.. Do Hoon Park. M.D.. Ju Yeong Kwak. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.12

Purpose: To report a case of acute orbital abscess after Medpor? implantation for orbital floor fracture repair. Case summary: A 15-year-old boy who was punched in the right orbit visited our clinic because of diplopia. An orbital CT scan demonstrated a fracture of the right orbital floor. At surgery, a Medpor sheet was placed over the orbital floor defect. Over the first three days, clinical improvement was gradual, but at four days postoperatively, depression of the right eye was restricted, and lower lid edema and proptosis was present in the right eye. At eight days postoperatively, the orbital CT scan showed a large cystic mass surrounding the Medpor sheet and fine needle aspiration cytology showed a number of inflammatory cells. Because systemic antibiotics were ineffective, the Medpo? sheet and the cystic mass were removed through a transconjunctival approach to the orbit. A culture of the removed Medpor? sheet grew Staphylococcus aureus and signs of inflammatory cells in the tissue were present. After removal of the abscess, most clinical symptoms showed improvement except for the remaining depression of the right eye. Conclusions: Symptoms of eye movement restriction, lower lid edema, and proptosis may be uncommon after orbital floor fracture repair but can occur. We should also consider the possibility of abscess formation due to infection of the implant and emphasize the importance of prompt diagnosis and treatment of such a case.

HDD의 디스크 공진에 의한 소음 저감 연구

손진승(Jin Seung Sohn),곽주영(Joo Young Kwak),조은형(Eun Hyung Cho),고정석(Jeong Seok Koh),이행수(Haeng Soo Lee),홍인표(Min Pyo Hong),좌성훈(Sung Hoon Choa) 한국소음진동공학회 2001 한국소음진동공학회 학술대회논문집 Vol.2001 No.11

중등도 이하 소아 근시에서 안경과 각막굴절교정렌즈 착용이 안축장 성장에 미치는 영향 비교

김태희(Tae Hee Kim),김명훈(Myung Hun Kim),곽주영(Joo Young Kwag),최진석(Jin Seok Choi),박규홍(Kyu Hong Pak),이경욱(Kyeongwook Lee),박태성(Taeseong Park),정성근(Sung Kun Chung),현주(Joo Hyun) 대한안과학회 2018 대한안과학회지 Vol.59 No.11

목적: 중등도 이하 소아 근시에서 안경과 각막굴절교정렌즈(orthokeratology lens, OK) 착용이 안축장 성장에 미치는 영향 및 관련인자를 알아보고자 하였다. 대상과 방법: 2013년부터 2015년까지 내원한 6세에서 13세 사이 -4.50디옵터 이하의 구면렌즈대응치를 가진 소아 100명을 대상으로 후향적으로 OK군(75안)과 안경군(64안) 간에 안축장 변화와 안축장과 관계된 인자들을 분석하였다. 결과: 안축장 변화는 1년째에 OK군이 0.24 ± 0.29 mm의 증가를, 안경군이 0.42 ± 0.20 mm의 증가를 보였으며, OK군에서 안경군에 비해 유의하게 안축장 성장이 억제되는 양상을 보였다(Mann-Whitney U test, p<0.05). OK군에서 처음 착용한 나이만이 안축장 변화와 음의 상관관계가 있는 것으로 나타났다(Pearson’s correlation, r=-0.481, p<0.05). 안경군에서는 처음 착용한 나이가 안축장 변화와 음의 상관관계(Pearson’s correlation, r=-0.462, p<0.05)를, 그 외에 현성굴절검사의 초기 구면렌즈대응치 및 초기 구면렌즈값, 난시값은 안축장 변화와 양의 상관관계를 보였다. 안축장 변화를 비교해 보았을 때 OK를 착용한 경우 6세 이상 9세 미만군(28안)에비해 9세 이상 13세 이하군(47안)에서 유의하게 안축장 성장이 더 억제되는 양상을 보였다(Mann-Whitney U test, p<0.05). 결론: OK 착용은 안경 착용에 비해 효과적으로 안축장의 성장을 억제할 수 있으며, 9세 이상 13세 이하의 소아에서도 효과적인 안축장 성장 억제가 가능하다. Purpose: To assess the effect on axial elongation and associated factors between spectacles and of orthokeratology lens (OK) wearing in children with mild to moderate myopia. Methods: A total of one hundred subjects, ranging in age from 6 to 13 years, and with mild to moderate myopia no more than -4.50 diopters in spherical equivalent, visited our clinic from 2013 to 2015. The OK group (75 eyes) and the spectacles group (64 eyes) were compared and analyzed on the axial elongation and associated factors. Results: In the OK group, axial length was elongated in 1 year period with a mean increase of 0.24 ± 0.29 mm. In spectacles group, axial length was elongated in 1 year period with a mean increase of 0.42 ± 0.20 mm. The statistically significant suppression of axial elongation was observed in OK group compared to the spectacles group (Mann-Whitney U test, p < 0.05). For OK group, the age of starting OK (Pearson’s correlation, r = -0.481, p < 0.05) was the only influencing factor on axial elongation, which had negative correlation with axial elongation. In spectacles group, the age of starting spectacles had negative correlation with axial elongation (Pearson’s correlation, r = -0.462, p < 0.05) and baseline spherical equivalent, spherical diopter, cylindrical diopter from manifest refraction had positive correlation with axial elongation. Comparison of axial elongation in orthokeratology lens group and spectacles group by age groups (6 to 9 years [28 eyes], 9 to 13 years [47 eyes]), 9 to 13 years of orthokeratology lens group had the stronger suppression of axial elongation (Mann-Whitney U test, p < 0.05). Conclusions: The OK effectively suppresses axial elongation compared to the spectacles. Although the patients are in age from 9 to 13 years, the axial elongation was effectively suppressed.

경증 건성안증후군에서 눈물막 삼투압의 임상적 유용성

김미정(Mi Jeong Kim),박세영(Se Young Park),곽주영(Joo Young Kwag),최진석(Jin Seok Choi),박규홍(Kyu Hong Pak),정성근(Sung Kun Chung) 대한안과학회 2021 대한안과학회지 Vol.62 No.3

목적: 경증 건성안증후군에서 I-PEN?? (I-MED Pharma Inc.;Dollard-des-Ormeaux;Canada)으로 측정한 눈물막 삼투압과 건성안 지표인 쉬르머검사;눈물막파괴시간;안구표면질환지수와의 상관관계를 각각 분석하여 눈물막 삼투압에 대해 평가하고자 한다. 대상과 방법: 각막염색을 이용하여 구분한 각막미란이 없는 1군 50명(67안)과 각막미란만 보이는 2군 59명(91안);총 90명(158안)의 경증 건성안 환자들을 대상으로 I-PEN?瑛막? 측정한 눈물막 삼투압과 쉬르머검사;눈물막파괴시간;안구표면질환지수 사이에 상관관계를 Pearson 상관분석을 이용하여 분석하였다. 결과: 눈물막 삼투압 수치와 쉬르머검사(r<-0.01;p=0.97);눈물막파괴시간(r=0.05;p=0.54);안구표면질환지수(r=0.03;p=0.76)는 통계적으로 유의한 상관관계를 보이지는 않았다. 각막염색점수로 분류한 1군과 2군 사이에서 쉬르머검사(p=0.31);눈물막파괴시간(p=0.11);눈물막 삼투압(p=0.12) 측정치는 유의한 차이를 보이지 않았으나;안구표면질환지수에서 유의한 차이가 있었다(p<0.01). 결론: 경증 건성안증후군에서 눈물막 삼투압과 건성안 지표들 사이에 유의한 상관관계는 없었으나 중증 건성안증후군에서 눈물막 삼투압의 진단적 가치에 관한 추가적인 연구가 필요할 것으로 생각된다. Purpose: To seek Pearson correlations of tear film osmolarity measured by the I-PEN?? (I-MED Pharma Inc.;Dollard-des-Ormeaux;Canada) with Schirmer test result;tear break-up time;and Ocular Surface Disease Index score in patients with mild dry eye syndrome. Methods: Patients with mild dry eye syndrome were divided into two groups according to Ocular Staining Score: group 1 (50 patients; 67 eyes) and group 2 (59 patients; 91 eyes);90 patients and 158 eyes in total. The above mentioned correlations were derived. Results: No significant correlations were observed between tear film osmolarity and Schirmer test result (r < -0.01;p = 0.97);tear break-up time (r = 0.05;p = 0.54);or Ocular Surface Disease Index score (r = 0.03;p = 0.76). When the two groups were compared;the Ocular Surface Disease Index score significantly differed between groups (p < 0.01);whereas the Schirmer test result (p = 0.31);tear break-up time (p = 0.11);and tear film osmolarity (p = 0.12) did not. Conclusions: No significant correlations were found between tear film osmolarity and other dry eye indicators in patients with mild dry eye syndrome. The diagnostic utility of tear film osmolarity in patients with moderate dry eye syndrome is should be evaluated.