4가지 각막곡률측정 시스템을 이용한 굴절교정수술 후 인공수정체도수계산법 비교

이우석,문상정,이경헌,이동준,Woo Seok Lee,Sang Jeong Moon,Kyung Heon Lee,Dong Jun Lee 대한안과학회 2013 대한안과학회지 Vol.54 No.12

Purpose: To report the evaluation and comparison of true corneal power after corneal refractive surgery through ARK, Orbscan II<SUP>®, Pentacam and IOL master. <br /> Methods: Target IOL (Intraocular lens) power calculated with the SRK/T formula using SMK (Sungmo Eye Hospital keratometry), which is a new method for measuring corneal refractive power, was compared with the back-calculated ideal IOL power after cataract surgery for 30 eyes that required cataract surgery and had previously undergone refractive surgery. Target IOL powers calculated using 4 systems were compared with IOL power calculated using the clinical history method for 64 eyes that had undergone refractive surgery. <br /> Results: Using SMK with the SRK/T formula, the actual refraction was within ±0.5 diopter (D) of the intended refraction for 63.8% of eyes and within ±1.0 D for 90.9% of eyes. Compared with target IOL power calculated with the clinical history method, target IOL power calculated by SMK with the SRK/T formula had a difference of 1.95 ± 0.86 D, which was similar to the results calculated by the Haigis-L formula and by TNP with Haigis. <br /> Conclusions: The difference in characteristics of intraocular lenses subtly affects the vision quality as measured by values such as MTF cut-off and Strehl ratio after cataract surgery. OQAS based on the double-pass technique is considered useful in more objective estimates of the real retinal image quality after cataract surgery which is difficult to explain simply by measuring visual acuity.<br /> J Korean Ophthalmol Soc 2013;54(12):1818-1823

자궁근종 치료를 위한 질경유 초음파 유도하 고주파 자궁근종용해술의 장기간 효과에 대한 임상적 연구

이우석,이일한,김동호,이상훈,Lee, Woo-Seok,Lee, Il-Han,Kim, Dong-Ho,Lee, Sang-Hun 대한생식의학회 2008 Clinical and Experimental Reproductive Medicine Vol.35 No.1

목 적: 질경유 초음파 유도하 고주파 자궁근종용해술의 임상적인 효과 및 안정성에 대해 분석해 보고자 하였다. 연구방법: 2004년 12월부터 2007년 3월사이에 질경유 초음파 유도하 고주파 자궁근종용해술을 시행받은 109명을 대상으로 하였다. 환자의 평균나이는 $42.8{\pm}5.8$세였고 모두 자궁을 보존하기 원하였다. 시술 전에 이학적 검사와 초음파를 이용한 병변의 크기 측정이 이루어졌다. 추적검사는 시술 후 1주일, 1개월, 3개월, 6개월 후 시행되었으며 동일 의사에 의해 크기 및 부피변화를 측정하였고, 방문 때마다 생리과다, 생리통 등의 근종 특이증상의 호전 유무를 추적 관찰하였다. 결 과: 근종의 평균 최대직경은 $6.1{\pm}0.5\;cm$ 이었고, 고주파용해술에 소요된 시간은 평균 $16.3{\pm}8.5$분이었다. 유의 할만한 크기와 부피의 감소는 시술 1개월 이후부터 발생하였으며 근종의 평균 최대직경은 시술 후 1주일, 1개월, 3개월, 6개월에 각각 $29.9{\pm}4.8%$ (p<0.001), $41.5{\pm}1.5%$ (p=0.05), $46.2{\pm}3.9%$ (p=0.003), $54.6{\pm}6.1%$ (p<0.001)의 감소율을 보였으며 평균 부피는 각각 $44.4{\pm}8.3%$ (p=0.001), $68.1{\pm}4.2%$ (p=0.035), $73.9{\pm}4.8%$ (p=0.042), $84.5{\pm}5.1%$ (p<0.001)의 부피 감소를 보였다. 일시적인 하복통과 출혈의 지속이 각각 3명씩 있었으나 모두 교정되었고 위중한 합병증은 발생되지 않았다. 생리통과 생리과다 등의 증상은 시술 3개월 후 유의하게 감소하였다. 결 론: 질경유 고주파 자궁근종용해술은 자궁을 보존하면서 좋은 효과와 조기 회복이 가능한 안전하고 효과적인 시술법이다. Objective: This study was performed to investigate the efficacy and safety of radiofrequency (RF) myolysis under transvaginal ultrasound guidance. Methods: Transvaginal RF myolysis had been performed in one hundred nine women with uterine leiomyoma at Chung-Ang University hospital between Dec. 2004 and Mar. 2007. All patients, mean aged $42.8{\pm}5.8$ years, desired their uterine conservation. Patients underwent physical examination, transvaginal pelvic ultrasound for measurement of the lesions preoperatively. Follow up was done at 1 week, 1 month, 3 months, 6 months after RF myolysis by same physician and measurement of size and volume of myoma and improvement of myoma specific symptoms such as menorrhagia and dysmenorrhea were checked at each visit. Results: The mean maximal diameter of myomas treated by RF myolysis was $6.1{\pm}0.5\;cm$ and average time of the procedure was $16.3{\pm}8.5$ minutes. A significant decrease of myoma size and volume was observed at 1 month after myolysis. Mean reduction in maximal diameter was $29.9{\pm}4.8%$ at 1 week (p<0.001), $41.5{\pm}1.5%$ at 1 month (p=0.05), $46.2{\pm}3.9%$ at 3 months (p=0.003), $54.6{\pm}6.1%$ at 6 months (p<0.001) after RF myolysis respectively. Mean reduction in volume was $44.4{\pm}8.3%$ (p=0.001), $68.1{\pm}4.2%$ (p=0.035), 73.9$73.9{\pm}4.8%$ (p=0.042), $84.5{\pm}5.1%$ (p<0.001) at the same follow up period respectively. Significant improvement of symptom was observed at 3 months after RF myolysis. Transient low abdominal pain and prolonged vaginal bleeding were detected in 3 patients each but spontaneously resolved and no serious complication has been noticed or found. Conclusion: This study shows transvaginal RF myolysis could be a safe and effective method to treat uterine leiomyoma, allowing uterine conservation with significant volume reduction and rapid return to normal activity.

수위-유량곡선의 보정기법 소개

이우석,Lee, U-Seok 한국수자원학회 2009 물과 미래(한국수자원학회지) Vol.42 No.7

습식배연탈황공정에서 석회석의 조성이 용해속도에 미치는 영향

이우석,이형근,조항대,김인원 ( W . S . Lee,H . K . Lee,H . D . Jo,I . W . Kim ) 한국화학공학회 1995 화학공학의이론과응용 Vol.1 No.2

폴리머 몰드를 이용한 금속 나노분말의 미세부품 제조

이우석,김상필,이혜문,배동식,최철진,Lee, Woo-Seok,Kim, Sang-Phil,Lee, Hye-Moon,Bae, Dong-Sik,Choi, Chul-Jin 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.3

Novel polymer mold process for fabrication of microcomponents using metal nanopowders was developed and experimentally optimized. Polymer mold for forming green components was produced by using a hard master mold and polydimethylsiloxane (PDMS). In the preparation of metallic powder premix for the green components without any defect, 90 wt.% 17-4PH statinless steel nanopowders and 10 wt.% organic binder were mixed by a ball milling process. The green components with very clear gear shape were formed by filling the powder premix into the PDMS soft mold in surrounding at about $100^{\circ}C$. Cold isostatic pressing (CIP) was very potent process to decrease a porosity in the sintered microcomponent. The microgear fabricated by the improved process showed a good dimension tolerance of about 1.2%.

펨토초레이저를 이용한 백내장 수술과 고식적 백내장 수술 비교

이우석,한상엽,이경헌,Woo Seok Lee,Sang Youp Han,Kyung Hun Lee 대한안과학회 2013 대한안과학회지 Vol.54 No.8

Purpose: To evaluate the surgical results and efficacy of laser refractive cataract surgery with a femtosecond laser compared with conventional phacoemulsification. Methods: Thirty-one eyes from 31 patients underwent laser refractive cataract surgery (femtosecond laser group), and conventional cataract surgery with phacoemulsification was performed in 30 eyes from 30 patients (conventional group). Best corrected visual acuity, spherical equivalent, surgical induced astigmatism, corneal and ocular astigmatism, total high order aberration, Strehl ratio, objective scatter index, diameter of continuous curvilinear capsulorrhexis (CCC), distance from visual axis to the center of CCC, intraocular lens (IOL) tilt, mean absolute error, effective phaco time, average phaco power and operation time were measured to compare the 2 groups. Results: No significant differences were found between best corrected visual acuity, spherical equivalent, surgical induced astigmatism, corneal and ocular astigmatism, total high order aberration, Strehl ratio, objective scatter index, mean absolute error, effective phaco time, average phaco power or operation time. Significant differences were found in the diameter of CCC, distance from visual axis to the center of CCC, and IOL tilt. Conclusions: Results of laser refractive cataract surgery with a femtosecond laser showed more precise CCC, and more stable IOL position than conventional cataract surgery.

정상 배란주기의 불임 여성에서 Clomiphene Citrate 단독 사용과 GnRH Antagonist 병합 요법의 임상적 효용성에 관한 연구

이우석,상재홍,김재준,김광준,김동호,이상훈,Lee, Woo Seok,Sang, Jae Hong,Kim, Jae Joon,Kim, Gwang June,Kim, Dong Ho,Lee, Sang Hun 대한생식의학회 2006 Clinical and Experimental Reproductive Medicine Vol.33 No.3

목 적: 본 연구는 인공 수정 시술에 있어서 정상 배란주기의 여성에서 clomiphene citrate와 GnRH antagonist를 병합하여 임선을 시도한 방법을 기존의 clomiphene citrate 단독으로 사용한 방법과 비교하여 그 임상적 유용성을 알아보고자 하였다. 연구방법: 116명의 환자들 중 43명에게는 자연 배란주기를 이용하여 인공 수정 시술을 시행하였고, 38명과 35명에게 각각 clomiphene citrate 단독 요법과 clomiphene citrate와 GnRH antagonist 병합 요법으로 인공 수정 시술을 시행하여 그 임상 결과를 비교 분석하였다. 결 과: 각각의 군에서 기저 LH, FSH, $E_2$와 배란 유도를 위해 hCG를 투여하는 날의 FSH, $E_2$는 차이를 보이지 않았으나 clomiphene citrate/GnRH antagonist 병합 요법군에서 hCG를 투여한 날의 LH와 자궁 내막 두께는 의미 있게 감소하였으며 유의한 임신율의 증가가 관찰되었다. 결 론: 자연 배란주기법군, clomiphene citrate 단독 요법 사용군에 비해 clomiphene citrate/GnRH antagonist 병합 요법 사용군에서 유의하게 임신율의 향상을 나타냈다. Objective: This study was to investigate the clinical efficiency of clomiphene citrate/GnRH antagonist protocol comparing with the clomiphene citrate only protocol in infertile women with normal ovulatory cycles. Method: Among 116 patients, 43 were received assisted reproductive technologies using natural ovulatory cycle, 38 and 35 were received clomiphene citrate only protocol and clomiphene citrate/GnRH antagonist combined protocol, respectively, and the clinical results were compared and analyzed Results: In each group, basal levels of LH, FSH, $E_2$ and FSH, $E_2$ on hCG day injected were not different, but LH level and endometrial thickness on hCG injected day were decreased significantly and the pregnancy rate was increased significantly in clomiphene citrate/GnRH antagonist group. Conclusion: The pregnancy rate was increased significantly in clomiphene citrate/GnRH antagonist group compared with natural ovulatory cycle and clomiphene citrate only group.

식품 접촉 모사 환경에서 식품유사용매의 LDPE-나노 TiO₂ 복합필름 재질특성 영향 평가

이우석,최재천,박세종,김미경,고성혁,Lee, Wooseok,Choi, Jae Chun,Park, Se-jong,Kim, MeeKyung,Ko, Seonghyuk 한국포장학회 2017 한국포장학회지 Vol.23 No.3

The effect of food simulants on properties and light barrier function of LDPE-nano $TiO_2$ composite film has been investigated. LDPE-nano $TiO_2$ composite films were prepared with 5.0wt% $TiO_2$ content by melt-extrusion. To simulate food contact environment, according to KFDA standards and specifications for food utensils, containers and packages, food simulants were selected with deionized water, 50% ethanol, 4% acetic acid and n-heptane and composite films were immersed in each food simulant at $70^{\circ}C$, 30 min except n-heptane ($25^{\circ}C$, 60 min). A variety of material properties, including crystallinity, chemical bonds, surface morphology, mechanical, oxygen barrier and optical properties, of LDPE-nano $TiO_2$ composite film were examined with and without the food simulants treatment. As a result, under regulated migration condition, LDPE-nano $TiO_2$ composite showed extremely stable in all properties tested in the study in contact with food simulants indicating that $TiO_2$ nanoparticles are physicochemically stable and quite compatible with LDPE. Results enable us to anticipate migration of $TiO_2$ will probably not occur. To evaluate influence of migration of $TiO_2$ on food stuffs, their color, pH and acidity were observed as well.

전산화 단층 모의치료기(Computed Tomography Simulator)의 영상을 이용한 TBI(Total Body Irradiation) 자세 잡이 및 보상체 제작의 유용성에 관한 고찰

이우석,박성호,윤인하,백금문,김정만,김대섭,Lee Woo-Suk,Park Seong-Ho,Yun In-Ha,Back Geum-Mun,Kim Jeong-Man,Kim Dae-Sup 대한방사선치료학회 2005 대한방사선치료학회지 Vol.17 No.2

Purpose : We should use a computed tomography-simulator for the body measure and compensator manufacture process was practiced with TBI's positioning in process and to estimate the availability.,Materials and Methods : Patient took position that lied down. and got picture through computed tomography-simulator. This picture transmitted to Somavision and measured about body measure point on the picture. Measurement was done with skin, and used the image to use measure the image about lungs. We decided thickness of compensator through value that was measured by the image. Also, We decided and confirmed position of compensator through image. Finally, We measured dosage with TLD in the treatment department.,Results : About thickness at body measure point. we could find difference of $1{\sim}2$ cm relationship general measure and image measure. General measure and image measure of body length was seen difference of $3{\sim}4$ cm. Also, we could paint first drawing of compensator through the image. The value of dose measurement used TLD on head, neck, axilla, chest(lungs inclusion), knee region were measured by $92{\sim}98%$ and abdomen, pelvis, inquinal region, feet region were measured by $102{\sim}109%$.,Conclusion : It was useful for TBI's positioning to use an image of computed tomography-simulator in the process. There was not that is difference of body thickness measure point, but measure about length was achieved definitely. Like this, manufacture of various compensator that consider body density if use image is available. Positioning of compensator could be done exactly. and produce easily without shape of compensator is courted Positioning in the treatment department could shortened overall $15\{sim}20$ minute time. and reduce compensator manufacture time about 15 minutes.

상안검에 국한되어 발생한 Merkel 세포 종양 1예

이우석,김상원,노주헌.Woo Seok Lee. MD. Sang Won Kim. MD. Joo Heon Roh. MD. PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.6

Purpose: To report a case of Merkel cell carcinoma on the left upper eyelid without metastasis and its immunohistochemical features. The carcinoma was successfully treated with excisional surgery and prophylactic radiation therapy. Case summary: A 76-year-old woman presented to the hospital complaining of a 0.6 × 0.9-cm-sized painless and purplish- red colored mass that had grown rapidly on her left upper eyelid margin over the previous two months. An excisional biopsy was performed. On immunohistochemical examination of the lesion, the tumor cells expressed immunoreactivity for synaptophysin and were negative for LAC and cytokeratin, confirming the diagnosis of Merkel cell carcinoma. Additional surgery was performed because the surgical margins were positive. No other primary or metastatic lesions were found. The patient was treated with local prophylactic irradiation and remained disease-free at her 10-month follow-up visit. J Korean Ophthalmol Soc 2012;53(6):856-860