Optical and Dielectric Properties of Chalcogenide Glasses at Terahertz Frequencies

강승범,Min Hwan Kwak,Bong Je Park,Sungil Kim,류한철,Se Young Jeong,Dae Won Kang,Sang Kuk Choi,백문철,Kwang Yong Kang,정동철,차은종 한국전자통신연구원 2009 ETRI Journal Vol.31 No.6

Terahertz time-domain spectroscopy has been used to study the optical and dielectric properties of three chalcogenide glasses: Ge30As8Ga2Se60, Ge35Ga5Se60, and Ge10As20S70. The absorption coefficients α(ν), complex refractive index n(ν), and complex dielectric constants ε(ν) were measured in a frequency range from 0.3 THz to 1.5 THz. The measured real refractive indices were fitted using a Sellmeier equation. The results show that the Sellmeier equation fits well with the data throughout the frequency range and imply that the phonon modes of glasses vary with the glass compositions. The theory of far-infrared absorption in amorphous materials is used to analyze the results and to understand the differences in THz absorption among the sample glasses.

한국인 고혈압 환자에서 고혈압망막병증과 표적기관장애의 동반양상

강승범,노영정,문정일,Seungbum Kang,Young-Jung Roh,Jung-Il Moon 대한안과학회 2010 대한안과학회지 Vol.51 No.9

Purpose: To report the relationship between hypertensive retinopathy and associated target organ damage in Korean hypertensive patients. Methods: A total of 519 hypertensive patients were divided into hypertension retinopathy grades I through IV based on fundus examination. According to the grade of each hypertensive retinopathy, the frequency of target organ damage (cardiovascular disease, chronic kidney disease, and retinal vessel occlusion) and the association with hypertension retinopathy were evaluated. Results: There were 211 patients (40.7%) without hypertensive retinopathy, 226 patients (43.5%) with hypertensive retinopathy grade I, 71 patients (13.7%) with grade II, seven patients (1.3%) with grade III and four patients (0.8%) with grade IV. The numbers of patients with cardiovascular disease were 103 (45.6%) in grade I, 57 (80.3%) in grade II, 3 (42.9%) in grade III, two (50.0%) in grade IV, and 70 (37.4%) in the non-hypertensive retinopathy group. According to four grades, the numbers of patients with cerebrovascular disease were three (1.3%), two (2.8%), zero (0%), and one (25.0%), respectively, with two (0.9%) in the non-hypertensive retinopathy patients. The respective numbers of patients with chronic kidney according to grades I through IV were 14 (6.2%), ten (14.0%), two (28.6%), and four (100.0%), as well as ten (4.7%) in the non-hypertensive retinopathy patients. The respective numbers of patients with retinal vessel occlusion were one (0.4%), two (2.8%), one (14.3%), and one (25.0%), with zero (0%) in the non-hypertensive retinopathy patients. Conclusions: The significance of hypertensive retinopathy should not be overlooked in Korean hypertensive patients due to an association with various target organ damage. J Korean Ophthalmol Soc 2010;51(9):1231-1236

활락단(活絡丹)이 항염(抗炎), 진통(鎭痛) 및 항혈전(抗血栓)에미치는 영향(影響)에 대(對)한 연구(硏究)

강승범,박종운,김종길,조남수,문병순,Kang, Seung-Bum,Park, Jong-Woon,Kim, Jong-Gil,Jo, Nam-Soo,Moon, Byung-Soon 대한한방내과학회 1999 大韓韓方內科學會誌 Vol.20 No.1

This study was designed to elucidate the anti-inflammatory, cardiovascular, anti-thrombotic, and analgesic effect of Whalrakdan. The anti-inflammatory effects was measured by the method of carrageenin induced edema, protein leakage test using CMC-pouch, and the effect of Whalrakdan on the cardiovascular system was observed by the change of flow rate of Ringer solution in the vascular system in the ear of rabbit. and the contraction and dilatation of rat tail artery. Death rate, platelet aggregation, plasma coagulation activity, antithrombin activity was observed for the measurement of the anti-thrombotic effect of Whalrakdan, and the analgesic effect was measured by the acetic acid method and hot plate method. The result was as follows: 1. After 2 or 3hour of Whalrakdan administration, carrageenin induced edema and CMC-pouch protein leakage was significantly decreased. 2. The slight anagesic effect of Whalrakdan extract was confirmed by the observation of writhing syndrome, paw licking time, and escape time. 3. The droplet of Ringer solution increased according to the increase of concentration of Whalrakdan extract, and the vasoconstriction decreased dependantly to the concentration of Whalrakdan extract. 4. The anti-thrombotic effect of Whalrakdan was observed by the decrease of death rate, the inhibition of platelet aggregation, and the increase of anti-thrombin activity.

이차성 삼차신경통에서 경피적 고주파 삼차신경절제술에 의한 동통조절 효과

강승범,손병철,김문찬,강준기,Kang, Seong-Buhm,Son, Byung-Chul,Kim, Moon-Chan,Kang, Joon-Ki 대한신경외과학회 2000 Journal of Korean neurosurgical society Vol.29 No.1

Objective : There are many treatment modalitis in management of idiopathic trigeminal neuralgia. In the secondary trigeminal neuralgia, there has been only sporadic reports of the etiology. Authors report the treatment result of secondary trigeminal neuralgia with percutaneous radiofrequency rhizotomy. Methods : During last ten years, 129 trigeminal neuralgias were treated by percutaneous radiofrequency(RF) rhizotomy by authors. Among them, nine patients were secondary trigeminal neuralgias. These patients refused treatment for the primary cause and only wanted pain control. The offending lesions were three arachnoid cysts, six tumors. The mean age was 47.8 years and the mean duration of follow-up was 6.2 years. The right V2,3 distribution was most prevalent area of pain. Authors used the conventional Hartel's anterior approach and straight electrode for RF lesion generation. Result : The early result was satisfactory. Eight of nine patients became free of pain and one patient needed minimal dose of carbamazepine. The overall pain control was 100%. There was no mortality or morbidity for initial RF rhizotomy. During follow-up, four patients showed recurrence of pain(44%). Among these, two underwent repeated RF rhizotomy and became free of pain. The other two were controlled with medical management. Conclusion : These results indicate that the percutaneous RF rhizotomy is effective means of pain control. Overall recurrence was somewhat higher than that of idiopathic trigeminal neuralgia. Even with recurrence, however, repeated RF rhizotomy seems to be effective method of control of pain in these cases.

Pr³⁺ 도핑된 셀레나이드 유리의 테라헤르츠 광학 특성

강승범,정동철,곽민환,Kang, Seung Beom,Chung, Dong Chul,Kwak, Min Hwan 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.11

Terahertz time-domain spectroscopy has been used to study the optical properties of $Pr^{3+}-doped$ selenide glasses. The complex refractive indexes of $Pr^{3+}-selenide$ glasses were measured in a frequency range from 0.3 to 1.5 THz. The real and imaginary refractive indexes increased with increasing frequency and $Pr^{3+}$ ion concentration. The obtained result indicated that the phonon modes of the $Pr^{3+}-doped$ selenide glasses shift to lower frequencies with the concentration of $Pr^{3+}$ ions. The theory of far-infrared absorption in amorphous materials was used to analyze the results. The measured data showed that the disorder-induced terahertz absorption increased with increasing $Pr^{3+}$ ion concentration.

미국 공공주택의 진화: 초이스 네이버후드 계획의 생활지원서비스를 중심으로

강승범,Kang, Seungbeom 한국토지주택공사 토지주택연구원 2018 LHI journal of land, housing, and urban affairs Vol.9 No.2

The purpose of this study is to introduce the design and early implementation results of Choice Neighborhoods(Choice) initiative, which is the most recent version of public housing policies in the United States designed and implemented under the Obama administration. The Choice initiative aims to support a wide range of strategies locally driven to address problems in disadvantaged neighborhoods with an emphasis on a comprehensive approach to transforming those neighborhoods. In this study, first, I briefly review the history of public housing policies since 1937, particularly focusing on limitations of HOPE VI(Housing Opportunity for People Everywhere) projects to understand the context behind the advent of the program. Second, I introduce the overall design of the Choice program and point out how this programs' design differs from previous public housing programs by reviewing the literature on federal guidelines for the Choice program. This study particularly focuses on introducing social services given to existing residents in public housing and their neighborhoods in redevelopment processes. These social services are intended to address poverty-related problems that public housing residents often confront, to help them break out of the cycle of poverty, and to minimize the negative impacts of relocation triggered by redevelopment. Third, to examine how this program has been implemented and has revealed limitations so far, I review an interim evaluation report based on five cities. This study ends with discussing policy implications for public housing providers and housing policy-makers in South Korea.

당뇨망막병증의 치료에서 후테논낭하 트리암시놀론 주입술과 범망막광응고술 병합치료의 효과

강승범,박영훈,Seungbum Kang,Young-Hoon Park 대한안과학회 2008 대한안과학회지 Vol.49 No.1

`Purpose: To investigate the result of posterior sub-tenon triamcinolone acetonide injection combined with panretinal photocoagulation (PRP) in patients with diabetic retinopathy. Methods: A prospective study was performed on patients with diabetic retinopathy who required PRP. The study group consisted of 12 patients (12 eyes) of diabetic retinopathy without clinically significant macular edema (CSME) and 13 patients (13 eyes) with CSME. All patients were injected posteriorly with sub-tenon triamcinolone acetonide (40 mg) one week before PRP. During a six-month follow-up, best-corrected visual acuity, the development of macular edema, changes in fluorescein angiography, and related complications were monitored. Results: During a six-month follow-up, visual acuity was well preserved in patients with diabetic retinopathy without CSME (12 eyes). Only one patient in this group experienced temporary macular edema at 3 months after combined therapy. In the CSME group (13 eyes), the visual acuities of seven patients (53.8%) increased, those of five patients (38.5%) remained same, and one patient's visual acuity (7.7%) decreased in a study period of six months. Fluorescein angiography showed that macular edema was resolved in most patients except in one patient in whom macular edema remained for up to 6 months. Complications from combined therapy occurred in two patients who showed slight and temporary increase of intraocular pressure. Conclusions: Combined treatment with posterior sub-tenon triamcinolone acetonide injection and PRP may provide benefits for patients with diabetic retinopathy who require urgent PRP by preventing exacerbation of macular edema.`

수력을 이용한 수정체유화술이 각막내피세포에 미치는 영향

강승범,길소연,정성근.Seung Bum Kang. M.D.. So Yeon Gil. M.D.. Sung Kun Chung. M.D. 대한안과학회 2007 대한안과학회지 Vol.48 No.3

Purpose: To access the effect of phacoemulsification using the AquaLase? (Alcon Laboratories, TX, U.S.A.) on corneal endothelial cell. Methods: This study comprised 47 eyes of 43 patients having phacoemulsification with the AquaLase?. Various corneal endothelial cell parameters, including corneal endothelial cell density, corneal thickness and morphologic change, were evaluated up to 2 months postoperatively. Results: Preoperative mean corneal endothelial cell density was 2818±282 cell/mm2. Postoperative mean corneal endothelial cell density was 2682±390 cell/mm2 at 1 day, 2701±263 cell/mm2 at 1 month and 2721±396 cell/mm2 at 2 month. Corneal endothelial cell loss was 4.74%, 4.00% and 3.55% at postoperative 1 day, 1 month and 2 months respectively. There was no statistically significant difference between preoperative and postoperative corneal endothelial cell density (p>0.05). The corneal endothelial cell loss was not increased even though the phacoemulsification time with the AquaLase? was increased (p>0.05). Preoperative mean corneal thickness was 559.4±37.4 ?m. Postoperative mean corneal thickness was 586.9±35.1 ?m at 1 day, 573.3±30.1 ?m at 1 month and 554.9±26.7 ?m at 2 month. There was a significant increase in corneal thickness at postoperative 1 day (p=0.001). However, there was no statistically significant difference of corneal thickness between preoperative and postoperative 1 month and 2 month (p>0.05). Conclusions: The phacoemulsification with the AquaLase? dose not cause the significant corneal endothelial cell density and corneal thickness change postoperatively.

CFRP 보강근의 인장 특성에 대한 선행연구 고찰

강승범(Kang, Seung-Bum),한성민(Han, Sung-Min),최기봉(Choi, Ki-Bong),최원창(Choi, Won-Chang) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2

CFRP 보강근은 탄소섬유로 제작된 FRP 보강근의 한 종류로 비부식성, 경량, 높은 인장 강도 등을 가지고 있다. 본 연구에서는 CFRP 보강근의 인장특성에 대한 선행연구를 고찰하였다. 그 결과, 인장강도는 지름의 크기, 표면처리에 따라 다른 값을 가진다. The cabon-FRP rebar is a type of FRP rebar and has properties of non-corrosiveness, light weight, and high tensile strength. In this study, previous studies on the tensile properties of CFRP rebar were reviewed. As a result, the tensile strength varies depending on the size of the diameter and surface treatment of CFRP rebars.

蜂毒鍼刺戟이 생쥐의 免疫機能에 미치는 影響

姜承範(Kang Seung-Bum),高炯均(Koh Hyung-Kyun),金昌煥(Kim Chang-Hwan) 대한한의학회 1996 대한한의학회지 Vol.17 No.1