유한차분 시간영역 방법을 이용한 Ag 나노링 구조의 산란효과

이태수,정종율,Lee, Tae-Soo,Jeong, Jong-Ryul 한국재료학회 2012 한국재료학회지 Vol.22 No.10

Enhancement of light trapping in solar cells is becoming increasingly urgent for the development of next generation thin film solar cells. One of the possible candidates for increasing light trapping in thin film solar cells that has emerged recently is the use of scattering from metallic nanostructures. In this study, we have investigated the effects of the geometric parameters of Ag nanorings on the light scattering efficiency by using three dimensional Finite Different Time Domain (FDTD) calculations. We have found that the forward scattering of incident radiation from Ag nanorings strongly depends on the geometric parameters of the nanostructures such as diameter, height, etc. The forward scattering to substrate direction is increased as the outer diameter and height of the nanorings decrease. In particular, for nanorings larger than 200 nm, the inner diameter of Ag nanorings should be optimized to enhance the forward scattering efficiency. Light absorption and scattering efficiency calculations for the various nanoring arrays revealed that the periodicity of nanorings arrays also plays an important role in the absorption and the scattering efficiency enhancement. Light scattering efficiency calculations for nanoring arrays also revealed that enhancement of scattering efficiency could be utilized to enhance the light absorption through the forward scattering mechanism.

선천성 코눈물관 폐쇄에 대한 변형 탐침술의 효과

이태수,박병우,김성우,Tae-Soo Lee,Byoung-Woo Park,Seong-Woo Kim 대한안과학회 2005 대한안과학회지 Vol.46 No.7

Purpose: To compare modified probing (swing method) to conventional probing for treating congenital nasolacrimal duct obstruction (CNLDO). Methods: From March 1997 to February 2004, we compared the result between two groups of CNLDO patients: one which underwent conventional probing (Group A: 126 eyes of 126 patients) and the other which underwent modified probing (Group B: 98 eyes of 98 patients) with the swing method. Results: In the comparison between the two groups, there were no statistical differences in genders and ages. When we selected patients according to the age group, we found no differences in the primary success rate between Groups A and B (p=0.088 for the patients of aged six to twelve months old, p=0.051 for the patients aged 13 to 18 months old). Compared by the number of probings, patients with no history of probing in each group showed no significant difference in the success rate (p=0.301). On the other hand, the patients in Group B who experienced probing more than once showed a significantly higher success rate than those in Group A (p=0.033). Conclusions: We recommend the swing method as a primary treatment for CNLDO in preference to conventional probing because the swing method shows a higher success rate for patients older than 13 months and also for those with a history of previous probing.

실패한 코경유눈물주머니코안연결술에서 교정수술의 결과

이태수,신형호,황상준,백세현,Tae Soo Lee,Hyung Ho Shin,Sang Jun Hwang,Se Hyun Baek 대한안과학회 2007 대한안과학회지 Vol.48 No.2

Purpose: This large case study evaluated the success rate of revisional surgery and the causes of failed endonasal dacryocystorhinostomy (DCR) with long-term follow-ups. Methods: One hundred nine patients (114 eyes) who underwent revisional surgery for a failed endonasal DCR at the Department of Ophthalmology, Guro Hospital, Korea University between January 1995 and January 2005 were included in this retrospective study. We evaluated the causes of failed endonasal DCR and their success rates of revisional surgeries. Results: The causes of surgical failure were membranous obstruction (83 eyes), granuloma (22 eyes), synechia (11 eyes), common canalicular obstruction (11 eyes), functional block (7 eyes), and canalicular obstruction (1 eye). The revisional surgeries were silicone tube intubation after granuloma removal, synechiolysis and membranectomy using Nd:YAG laser and trephination of canalicular obstruction, and endonasal conjunctivodacryocystorhinostomy (CDCR) for the parts of functional block and the canalicular obstruction. The overall success rates of the revisional surgeries were 83.3% (95/114 eyes). The mean follow-ups period was 18.97 months (range, 9~113 months). Conclusions: This is the first large case study in Korea on revisional surgery with long-term follow-ups, as far as we know. The overall success rates of endonasal DCR after receiving simple revisional surgery were comparable to those of the standard external DCR.

u-Healthcare를 위한 바이오 단말기의 개발 현황

이태수,홍주현,Lee, Tae-Soo,Hong, Joo-Hyun 대한의용생체공학회 2009 의공학회지 Vol.30 No.3

Biomedical mobile devices for ubiquitous healthcare consist of biomedical sensors and communication terminal. They have two types of configuration. One is the sensor-network type device using wired or wireless communication with intelligent sensors to acquire biomedical data. The other is the sensor embedded type device, where the data can be acquired directly by itself. There are many examples of sensor network type, such as, fall detection sensor, blood glucose sensor, and ECG sensors networked with commercial PDA phone and commercial phone terminal for ubiquitous healthcare. On the other hand, sensor embedded type mounts blood glucose sensor, accelerometer, and etc. on commercial phone. However, to enable true ubiquitous healthcare, motion sensing is essential, because users go around anywhere and their signals should be measured and monitored, when they are affected by the motion. Therefore, in this paper, two biomedical mobile devices with motion monitoring function were addressed. One is sensor-network type with motion monitoring function, which uses Zigbee communication to measure the ECG, PPG and acceleration. The other is sensor-embedded type with motion monitoring function, which also can measure the data and uses the built-in cellular phone network modem for remote connection. These devices are expected to be useful for ubiquitous healthcare in coming aged society in Korea.

레이저 누낭소작술의 임상적 유용성

이태수,김정완,Tae Soo Lee,Jung Wan Kim 대한안과학회 2008 대한안과학회지 Vol.49 No.11

Purpose: To evaluate the usefulness of laser cystectomy for the treatment of patients with dacryocystitis and sump syndrome. Methods: Thirteen patients (13 eyes) diagnosed with acute or chronic dacryocystitis, and nine patients (9 eyes) who developed sump syndrome after dacryocystorhinostomy from 2005 to 2006 underwent laser cystectomy and endonasal dacryocystorhinostomy. Results: Pain and swelling around the orbit improved immediately after the operation in patients with acute dacryocystitis, and all symptoms of sump syndrome disappeared by 1 month postoperatively. Epiphora reduced in all patients. During the follow-up period, functional nasolacrimal duct obstruction occurred in one eye and membranous obstruction developed in two eyes. In these two eyes with membranous obstruction, revisional surgery was performed successfully. No recurrence of dacryocystitis was noticed. Conclusions: Laser cystectomy with endonasal dacryocystorhinostomy is a simple and effective treatment modality for patients with dacryocystitis and sump syndrome that minimizes the risk of recurrence. J Korean Ophthalmol Soc 2008;49(11):1717-1722

무안구성 얕은 아래결막구석 환자에서 아래속눈썹밑 피부절개를 통한 결막구석재건술

이태수,황상준,오종현,Tae Soo Lee,Sang Jun Hwang,Jong Hyun Oh 대한안과학회 2007 대한안과학회지 Vol.48 No.5

Purpose: To evaluate the usefulness of a new technique for the subciliary approach to the surgical management of anophthalmic, shallow inferior fornices. Methods: Six patients with difficulty retaining an ocular prosthesis, due to anophthalmic, shallow inferior fornices with sufficient conjunctiva, underwent this operation from October 2003 to April 2005. Surgery consisted of the fixation of the conjunctival fornix to the periosteum immediately posterior to the inferior orbital rim through the subciliary approach. This study was prospective. Results: The mean age of the patients was 40.1±14.7 years (range, 21~62 years). Three of six patients were male, and three were female. The mean duration of surgical anophthalmos was 16.8±13.2 years (range, 0.6~40 years), and the mean follow-up period was 9.3±8.4 months (range, 3~25 months). All 6 patients who could not wear prostheses because of shallow fornices could wear ocular prostheses successfully after the operation. An ocular prosthesis could be fitted at a mean duration of 1.83±0.75 weeks (range, 1~3 weeks), postoperatively. Only one patient had mild entropion, but there were no conjunctival contractures or loss of fornices postoperatively. Conclusions: The authors believe that this new technique through the subciliary approach is simple and easy to perform and enables the patient to wear an ocular prosthesis earlier than does forniceal reconstruction through the transconjunctival approach. This technique is very useful in patients with anophthalmic, shallow inferior fornices who have sufficient conjunctiva but loose attachments of the fornix to the underlying tissue, causing shallow fornices.

Coats 씨병 1례

김용태 , 이태수 , 이성택 , 이웅빈 ( Yong Tae Kim , Tae Soo Lee , Seong Taek Lee , Woong Bin Lee ) 대한안과학회 1972 대한안과학회지 Vol.13 No.4

한국의 복지국가 발전에 있어 사회적 기업의 의의와 한계

이태수(Tae Soo Lee) 피터드러커 소사이어티 2009 창조와 혁신 Vol.2 No.2

한국사회에서는 사회적 기업이 어떤 환경에 처해있고, 어떤 미래의 전망을 갖고 가야하며, 이를 위한 정부와 시민사회, 기업의 역할과 노력들이 무엇이어야 하는지, 특히 법이나 제도 차원에서 어떤 조건들이 충족되어야 하는 지에 대해 충분한 공감대가 이루어졌다고는 할 수 없다. 그런 가운데 한국사회에서 복지국가를 더욱확립･강화시켜야한다는 측면에서 볼 때에도 현재의 사회적 기업에 대한 진행경과가 과연 어떤 함의를 지닌 것이며, 향후 어떤 영향을 초래할 것인가에 대해 충분한 논의가 있어야할 것이다. 본 논문은 바로 이러한 문제의식에서 현재 한국사회가 당면한 복지국가로서의 위상과 과제를 논하고 특히 향후 국가와 시민사회가 수행해야할 책무를 전제로 할때 현재의 사회적 기업 추이가 가져올 수 있는 장･단점을 분석하여 시사점을 끌어내는 데에 주된 목적을 두었다. 결론적으로 볼 때, 창조와 혁신을 바탕으로 한 사회적 기업이 한국적 현실에서는 오히려 관료화되거나 신자유주의적 복지국가모형으로 귀착되는 데에 기여할 우려가 있음을 확인할 수 있었다. 한국 사회내에 사회민주주의의 전통이나 노동조합 또는 협동조합의 뿌리가 취약한 상황에서, 더군다나 공공부문의 역할이 충분히 발현되지도 않은 상황에서 한국은 시장주도적 모형을 지향할 가능성이 태생적으로 높다하겠다. 따라서 현재의 정부정책에 대한 적절한 보완이 필요하며 시민사회진영의 적절한 대응 또한 요구되는 바이다. 특히 몇가지를 결론적으로 제시하면 다음과 같다. 첫째, 사회적기업육성법에 있어 사회적 기업에 대한 정의에 대한 유연성을 지금보다 훨씬 더 많이 확보해야 한다. 둘째, 정부의 재정에 대한 사회적 기업들의 의존성을 일정정도 벗어나기 위해 다양한 재원조달 방식이 개발되어야 한다. 셋째, 협동조합이나 공익법인과 같은 공공적 성격의 주체들이 사회적 기업 형태로 진화하는데에 있어 영리나 순수민간과는 차별적인 보호장치를 통해 보호되도록 해야 한다. Passing through varous stages, Korean social welfare has shown several features; s the growth process compressed, the system centralized by the central government, and the system initiated by the public assistance and social insurance, etc. Social entrepreneurship(S.E.), related to these features above, can be expected to play an important role in the development of Korean welfare state. Usefulness of S.E. is as follows. First, since Korean social welfare system has focused simply on public aids and social insurance, S.E. can function as engine for developing social welfare service. Second, S.E. can be helpful to overcome market failure and contract failure in the social service sector. Third, S.E. can promote the participation of civil sector into welfare and establish such an autonomous base in the same sector, which can organize the suitable system of Welfare Mix in Korea. On the other hand, S.E. in Korea is simultaneously showing severe limitations. First, the state's roles such as a financing subject of social expenditure are not fully fulfilled yet. Promoting S.E. may burden the responsibility of the state on the civil sector. Second, while the welfare delivery system in Korea is initiated by non-profit sector, S.E. may affect harmfully by stimulating the tendency of privatization and profitization. Third, since the government led to legislate the law concerning S.E. and enforce the policy of S.E. mostly, it is possible that this can strengthen the control of the government on S.E. Since the base of social democracy or unionism has been insufficient and the role of the public sector has been inferior, Korea is highly likely to approach market-initiative model in England among the models mentioned before. However the English model is not suitable to be received in Korea, in considering the poor contributions which the public sector has achieved till now and the proper model of Korean welfare state in the future. Therefore it is needed to modify present governmental policies and the correspondence from the private. The key suggestions are as follows: First, when it comes to the S.E. law, flexibility of the meaning of S.E. should be reinforced so that originality and spontaneity of the private can be guaranteed. Second, in order not to depend on the state budget, various financial resources for supporting S.E., especially from the firms, should be constituted. Third, public subjects like cooperatives should be protected through differential benefits, so that profit-seeking subjects like commercial companies cannot be over-extended.

누낭비강문합술시에 실리콘튜브 및 스텐트 삽입이 육아종발생에 미치는 영향

이태수(Tae Soo Lee),김상우(Sang Woo Kim) 대한안과학회 1999 대한안과학회지 Vol.40 No.1

안구돌출증에 대한 Transantral - ethmoidal approach 를 이용한 안와의 외과적 감압효과

이태수(Tae Soo Lee) 대한안과학회 1984 대한안과학회지 Vol.25 No.1