실험적 안구천공상에서 일차적 공막돌륭술의 효과

이경원,이석준,이종혁,Kyung-won Lee,M,D,Seok-joon Lee,M,D,Jong-hyuck Lee,M,D 대한안과학회 2005 대한안과학회지 Vol.46 No.1

Purpose: Scleral buckles are frequently performed as an additional procedure in perforated ocular injury surgery, but little is known about their independent effect after ocular trauma. The authors made a posterior penetrating ocular injury model in rabbits to evaluate the isolated role of primary scleral buckle placement. Methods: Twenty eyes underwent surgery. The penetrating injury consisted of two 5 mm circumferential incisions placed five clock hours apart and 7 mm behind the limbus. A segmental scleral buckle was placed over a randomly chosen penetrating injury site after wound closure. The degree of the fibrous proliferation, traction, and the presence of retinal detachment were evaluated on follow-up examination. After enucleation and fixation, tissue sectioning was performed including injury sites. The greatest dimension of the fibrous proliferation at both wound sites was measured. Results: Two eyes were excluded from the study due to unsuccessful buckling. Four eyes developed a retinal detachment. The remaining 14 eyes showed varying degrees of proliferation and traction on the retina. The greatest dimension of the fibrous proliferation at the buckle site (1.69±0.29 mm) was significantly different from that at the non-buckle site (2.07±0.37 mm, P<0.05). Conclusion: Primary scleral buckle placement at the time of surgical repair reduces vitreous traction and decreases the degree of fibrous proliferation.

범주형 환경변수를 고려한 부대성과평가 방법에 관한 연구 - DEA와 CCCA의 결합을 중심으로 -

이경원,박명섭,임재풍,Lee, Kyung-Won,Park, Myung-Seop,Im, Jae-Poong 한국국방경영분석학회 2006 한국국방경영분석학회지 Vol.32 No.1

There are many occasions that the performance of a corps is influenced not only by its own efforts but by the commander of the next higher unit in a vertical organizational structure. When the direction of the commander in the next higher organization is different from that of the actual evaluation agency, the unit under evaluation may get rated lower than what it should deserve. This study suggests an alternative method to evaluate the performance of military units in the situation that there exist critical environmental factors which affect the performance. This method employes DEA, a non parametric method, and Constrained Canonical Correlation Analysis(CCCA), a parametric method which is used to estimate a efficient frontier with multiple dependent variables and constraints. This article also exploits a set of categorical environmental variables in the CCCA to improve the fairness of performance evaluation. It is shown that the introduction of the categorical variables helps evaluating the true performance of individual units such as battalions subordinated to different next higher commanders. 계층구조로 이루어진 군부대에서 예하부대의 성과는 피평가부대의 개별적인 노력뿐만 아니라, 그 부대가 속해있는 지휘라인의 1차 상급지휘관의 부대지휘방향에 따라 상당한 영향을 받는 경우가 많다 평가를 담당하는 기관인 2차 상급조직에서 제시하는 평가요소에 대한 중요도가 1차 상급지휘관의 부대지휘방향과 상이하다면, 해당부대는 1차 상급지휘관의 의도를 충실히 구현하였음에도 불구하고 다른 지휘라인의 부대들보다 낮은 평가를 받을 수 있다. 본 연구는 계층적 구조하에서 성과방향의 차이를 야기하는 지휘라인별 특성을 집단외생변수로 취급하여 평가의 공정성을 기하기 위한 연구이다. 비모수적 기법인 DEA와 모수적 기법으로서 다수의 종속변수가 존재하고 모수의 제약을 반영할 수 있는 제약정준상관분석(CCCA: Constrained Canonical Correlation Analysis)의 결합모형을 이용하였으며, 이 과정에서 성과에 영향을 미치는 집단환경변수를 범주화하여 대대급 부대의 성과평가를 수행하였다.

수정된 설계 방정식을 이용한 허니컴 구조의 차폐 효과 예측

이경원,정영철,홍익표,육종관,Lee Kyung-Won,Cheong Yeong-Chul,Hong Ic-Pyo,Yook Jong-Gwan 한국전자파학회 2005 한국전자파학회논문지 Vol.16 No.9

In this paper, the modified design equation of shielding effectiveness was presented to predict more accurately the shielding effectiveness of honeycomb structure with hexagonal waveguide. The design equation of shielding effectiveness in honeycomb was represented from adding shielding effectiveness of single lattice to shielding effectiveness of infinite array of single lattice. This paper proposed the generalized design equation of shielding effectiveness by analyzing basis lattice of hexagonal waveguide which composes honeycomb structure and infinite array structure of basis lattice. To provide the validity of the modified design equation of shielding effectiveness in this paper, comparison with other available date using 3D EM commercial software is made. 본 논문에서는 전자기 차폐 구조로 널리 알려진 육각형 도파관 구조를 갖는 허니컴 구조의 차폐 효과를 정확하게 예측하기 위하여 기존의 차폐 효과 설계식을 수정하여 새로운 차폐 효과 설계식을 제안하였다. 허니컴의 차폐 효과 설계 방정식은 단일 격자의 차폐 효과와 무수히 많은 격자 구조의 차폐 효과의 합으로 표현되는데, 본 논문에서는 허니컴 구조를 이루고 있는 육각형 기본 격자를 해석하고, 기본격자가 다수의 배열로 이루어진 해석을 통해 일반화 된 차폐 효과 설계 방정식을 제안하였다. 제안한 차폐 효과 설계 방정식의 유효함을 입증하기 위하여 상용 소프트웨어의 3D EM 시뮬레이션과 비교하였다. 또한, 측정 결과와 비교하여 본 논문에서 제안한 수정된 차폐 효과 설계 방정식이 기존의 설계 방정식보다 더 정확하다는 것을 보여주었다.

액와접근법을 이용한 무기하 내시경 갑상선 절제술 후 국소 부위 통증 조절 장치(On-Q^Ⓡ PainBuster^Ⓡ)와 자가 통증 조절 장치의 무작위 대조 연구에 대한 예비 자료

이경원,박찬흔,박용래,현기훈,윤지섭,Kyung-Won Lee,Chan-Heun Park,Yong-Lai Park,Ki-Hun Hyun,Ji-Sup Yoon 대한갑상선-내분비외과학회 2013 The Koreran journal of Endocrine Surgery Vol.13 No.4

Purpose: Gasless transaxillary approach to endoscopic thyroidectomy is a widely performed procedure for benign or malignant thyroid neoplasms. However, it requires wide dissection for approaching the target area. The intravenous patient-controlled analgesia (IV PCA) is an effective method for postoperative pain control and patients can use it according to their requirement. However, patients suffer from nausea, vomiting, sleep disturbance, etc. due to opioids. Pain pump ON-Q^Ⓡ PainBuster^Ⓡ (pain buster) has been used widely in various surgeries for control of postoperative localizing and wide area pain without side effects of opioid analgesia because it consists of Ropivacaine. Methods: From Aug. 2008 to Jan. 2013, Gasless transaxillary endoscopic thyroidectomy was performed in 90 patients in a single institution, who were divided into three groups, including the IV PCA, pain buster, and null groups. We compared postoperative outcomes, pain severity between groups. We recorded scores immediately, 6, 12, 24, and 48 hours after surgery following visual analog pain score (VAS), and investigated hospital stay and occurrence of events of nausea, vomiting, and complications. Results: In the IV PCA group, it was discontinued due to nausea in 36.7% of patients. No significant difference in pain severity following VAS score was observed among the three groups. However, smaller numbers of analgesia injections were required in the Pain buster group than in the other groups, and fewer patients suffered from constipation, compared with the PCA group. Conclusion: Pain buster showed even effects compared to IV PCA, with few side effects and less discomfort of patients, compared with the other groups. Therefore, pain buster was thought to be the proper method for pain control after dissection of the anterior chest wall, cervical area in order to secure an operative view for transaxillary endoscopic thyroi-dectomy.

응력해석을 통한 고속기어 치형수정에 관한 연구

이경원(Kyung Won Lee),반재삼(Jae Sam Ban),김규하(Kyu Ha Kim),조규종(Kyu Zong Cho) 한국정밀공학회 2002 한국정밀공학회 학술발표대회 논문집 Vol.2002 No.5월

한국 성인의 지역유형별 혼밥 패턴과 정신건강의 연관성

이경원(Kyung Won Lee),신다연(Dayeon Shin) 대한지역사회영양학회 2021 대한지역사회영양학회지 Vol.26 No.6

W. E. B. 듀보이스와 "니그로"의 재구성

이경원 ( Kyung Won Lee ) 한국영어영문학회 2009 영어 영문학 Vol.55 No.5

누구를 위한 혁명인가?: 파농의「베일 벗은 알제리」와 여성해방의 복화술

이경원 ( Kyung Won Lee ) 한국영어영문학회 2014 영어 영문학 Vol.60 No.4

The opening question of “what does the black man want?” in Black Skin, White Masks remains Fanon’s overriding concern in his whole career. The generic terms like ‘the Negro’ and ‘the native’ are almost always marked as male. A meticulous reading of “Algeria Unveiled” reveals that Fanon is just another black nationalist who recognizes gender relations as a formative dimension of national liberation. In highlighting the Algerian women’s resistance to the civilizing mission of colonial power, Fanon unknowingly denies “the historic dynamism of the veil” within Algerian patriarchal society. Preoccupied with the nationalist agenda of debunking colonialist rescue fantasy, Fanon is unaware that the veil, once a means to exclude Algerian women from public space, is now a cultural and ideological battleground between Algerian patriarchy and European colonialism. Moreover, Fanon’s notions of female instrumentality are unmistakable. Though Fanon applauds Algerian women for their courageous and self-immolating struggle, his narrative still hinges upon the hierarchical binarism between male fighter and female helper. So women’s liberation in Fanon becomes a ventriloquial discourse for national liberation. Algerian women, without any histories before the Algerian War, are called upon by Algerian men to play an ideological upstart as well as freedom fighter, and their place ever remains within and below the nation.

NF₃와 O₂ 리모트 플라즈마 노출에 따른 니트릴 가교 과불소고무와 과산화물 가교 과불소고무의 무게 손실과 모폴로지 특성

이경원(Kyung Won Lee),김태호(Tae Ho Kim) 한국고분자학회 2011 폴리머 Vol.35 No.2

니트릴 가교 과불소고무와 과산화물 가교 과불소고무의 내플라즈마 특성을 평가하기 위해 고온상태에서 NF3, O2 리모트 플라즈마에 노출된 과불소 고무 재질의 오링(O-ring)에 대해 각각의 무게 손실 및 표면 특성을 확인하였다. 이를 위해 컴파운드는 반도체 및 LCD 생산라인에서 적용되고 있는 오링/씰 제조를 위한 전형적인 처방에 맞춰 설계하고 오픈 롤을 사용하여 혼련작업을 실시하였으며, 이후 열프레스로 작업한 후 오븐을 이용한 후가교 공정을 거쳐 최종 오링 형태로 제조하였다. 가교된 과불소고무 오링을 고온 플라즈마 환경에 노출시킨 후 무게 감량 및 표면 특성 변화를 전자 저울 및 주사전자현미경을 사용하여 관찰하였다. 그 결과, 과불소고무의 가교타입, 필러 시스템, 플라즈마의 종류에 따라 무게 손실과 표면 상태의 변화가 상당한 수준으로 발생되는 것을 확인하였다. The plasma resistances of nitrile curable perfluoro elastomer (NT PFE) and peroxide curable PFE (PO PFE) after exposing to NF3 and O2 remote plasmas were investigated by analyzing weight loss and morphology of O-ring made of PFE. The compounds were designed following the typical formulations of O-ring/seal which were applied in semiconductor and LCD production site. They were blended by an open roll mill, and then, O-ring was finally made by hot press molding and oven curing. The weight loss was calculated and morphology was observed for each atmosphere and temperature by a digital weighing machine and SEM. As results, it was confirmed the weight loss and related morphology were meaningfully different according to the cure type of PFE, filler system, and the species of remote plasma.

항강통(項强痛)과 스트레스, 분노, 불안, 우울의 상관관계

이경원 ( Kyung Won Lee ),최우진 ( Woo Jin Choi ),손인봉 ( In Bong Son ),이승기 ( Seung Gi Lee ),선승호 ( Seung Ho Sun ) 대한한방신경정신과학회 2010 동의신경정신과학회지 Vol.21 No.4

Objectives: The objective of this study was to observe the relationships between neck pain and psychological factors such as stress, anger, anxiety and depression. Methods: Under mental stress, the 31 patients with neck stiffness and 32 control subjects with no neck stiffness were measured by using NDI, BEPSI, GARS, STAXI, STAI, and BDI scales. The psychological scales between the patients and the controls were taken to observe the average results by comparing between the two groups. Also NDI and psychological scales of correlation analysis was performed. Results: 1. The mean scores of NDI, BEPSI, GARS, State-Anger, Trait-Anger, Anger-out, Anger-In, Sate-Anxiety, Trait-Anxiety, and BDI under patients group were significantly higher than those in control group. 2. The value of NDI comparing to the values of BEPSI, GARS, State-Anger, Trait-Anger, Anger-out, Anger-In, Sate-Anxiety, Trait-Anxiety, and BDI in this study resulted in high correlation among each others which showed statistically significant. Conclusions: It has the possibility that the neck pain with stress, anxiety, anger and depression might be related highly in correlation, especially in stress and anxiety which showed the most high correlation.