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이성욱,이기호 한국통신학회 2014 정보와 통신 Vol.31 No.3
지난 반세기 동안 전세계 통신 기술은 기지국-셀간 1:1 대응을 기반으로 설계 되고 만들어 졌다. 이에 따라 셀 간 경계에서의 통신 품질 저하는 당연한 현상으로 받아 들여졌다. 이와같은 전제 하에 무선 경계에서 통신 품질 향상을 목표로 다양한 스케줄링 기법, ICIC, eICIC[1] 등의 간섭 회피 기법등이 연구 되었다. 하지만 이러한 방식은 기지국간 정보 공유의 제한과 delay에 의해서 실용성이 현저히 떨어진다. 이를 극복하기 위해 모든 정보를 공유하는 가상화(cloud) 기술이 대안으로 떠오르고 있다. 현재 국내 통신 사업자인 KT는 LTE통신망에 가상 기술을 적용하여 세계 최초로 가상화 기반 LTE 통신서비스를 제공하고 있다. 이에 본고에서는 현재 구현되어 있는 가상화 기술과 현황, 앞으로 구현될 기술에 대해서 알아본다.
GES(gold eletroforming system)를 이용한 임프란트 보철물의 제작에 관한 연구
이성욱,서규원 고려대학교 임프란트연구소 2001 임프란트연구지 Vol.3 No.1
Distortions of casting body and unfitness of margin lead to failure or remaking the implant restorations in the cases of long span bridges. It is necessary to use of eletro forming system and spark erosion machine in the fabrication of the implant restorations to make accurate margin and passive fitness. This study presents new lab. procedure of implant restoration and suggests the joining procedure between electroformed crown and connecting elements with gold bonder.
Retreatment for relapse or non-responder, which is really effective?
이성욱 대한간학회 2011 Clinical and Molecular Hepatology(대한간학회지) Vol.17 No.3(S)
Retreatment with pegylated-interferon and ribavirin combination to whom failed after first treatment with conventional or pegylated interferon with ribavirin combination is effective. Several RCT studies showed better SVR rate in relapser group than in non-responder group. Subanalysis results showed better SVR rate in genotype 2 or 3 than in genotype 1. Especially in relapser group with low viral load after first treatment it is similar SVR rate with first treatment. So, it is recommended to retreat with pegaylated interferon and ribavirin combination to whom failed after previous treatment, especially in relapser, genotype 2 or 3 and low viral load after previous treatment.
Tb<sup>3+</sup>Y<sup>3+</sup> 및 Eu<sup>3+</sup>와 같은 희토류 금속을 가진 유·무기 하이브리드 형광체의 합성 및 발광특성
이성욱,김시석,박제영 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Tb<sup>3+</sup>Y<sup>3+</sup>금속을 가지는 benzene-1,3,5-tricarboxylate complex 및 Eu<sup>3+</sup>금속을 가지는 quinoline계 carboxylate complex 형광체는 자외선 영역에서 여기하여 발광하는 특징을 가지고 있으며, 특히 Tb<sup>3+</sup>Y<sup>3+</sup>금속을 가지는 유무기 하이브리드 형광체는 240~320nm 범위 파장에서 여기 되어 550~554nm의 파장에서 강한 Green 형광을 방출하는 특징이 있다. 또한 Eu<sup>3+</sup> 금속을 가지는 유무기 하이브리드 형광체는 360~380nm범위의 파장에서 여기되어 575~700nm의 파장에서 강한 Red 형광을 방출하는 특징이 있다. 본 연구에서는 희토류 금속을 가지는 [Tb<sup>3+</sup>Y<sup>3+</sup>]benzene-1,3,5-tricarboxylate complex 및 Eu<sup>3+</sup>[quinoline계 carboxylate complex]형광체를 각각 제조하고, 제조된 유무기 하이브리드 형광체는 입자 형상 및 구조 특성에 따라 발광효율이 증가하는 경향을 보였으며, Tb<sup>3+</sup>Y<sup>3+</sup>함량 조절에 따른 발광 특성 및 유기리간드의 종류에 따른 발광 특성에 관한 연구도 진행 하였다. 따라서 높은 발광 강도 및 내열성, 내약품성이 우수하고, 매질광의 높은 분산성을 보유하고 있는 유무기 하이브리드 형광체를 제조 및 제품화 하여 잉크, Molecular, Bio분자 분광분야에 적용하고 있다.
이성욱,조용석,M. SONG,H. KIM,J. PARK,백두성 한국자동차공학회 2012 International journal of automotive technology Vol.13 No.3
Particulate matter in diesel engine exhaust, particularly nano-particles, can cause serious human health problems including diseases such as lung cancer. Because diesel nano-particle issues are of global concern, regulations on particulate matter emissions specify that not only the weight of particulate matter emitted but also the concentration of nanoparticles must be controlled. This study aimed to determine the effects on nano-particle and PM emissions from a diesel engine when applying a urea-SCR system for NOx reduction. We found that PM weight increases by approximately 90% when urea is injected in ND-13 mode over the emission without urea injection. Additionally, PM weight increases as the NH3/NOx mole ratio is increased at 250 oC. In SEM scans of the collected PM, spherical particles were observed during urea injection, with sizes of approximately 200 nm to 1 μm. This study was designed to determine the conditions under which nano-particles and PM are formed in a urea-SCR system and to relate these conditions to particle size and shape via a quantitative analysis in ND- 13 mode.
이성욱,김재성,김영석,조재호,최서희,남택근,정송미,김영경,최영민,이동은,박원,조관호 대한암학회 2022 Cancer Research and Treatment Vol.54 No.4
Purpose This study proposed the optimal definition of biochemical recurrence (BCR) after salvage radiotherapy (SRT) following radical prostatectomy for prostate cancer. Materials and Methods Among 1,117 patients who had received SRT, data from 205 hormone-naïve patients who experienced post-SRT prostate-specific antigen (PSA) elevation were included in a multi-institutional database. The primary endpoint was to determine the PSA parameters predictive of distant metastasis (DM). Absolute serum PSA levels and the prostate-specific antigen doubling time (PSA-DT) were adopted as PSA parameters. Results When BCR was defined based on serum PSA levels ranging from 0.4 ng/mL to nadir+2.0 ng/mL, the 5-year probability of DM was 27.6%-33.7%. The difference in the 5-year probability of DM became significant when BCR was defined as a serum PSA level of 0.8 ng/ml or higher (1.0-2.0 ng/mL). Application of a serum PSA level of ≥ 0.8 ng/mL yielded a c-index value of 0.589. When BCR was defined based on the PSA-DT, the 5-year probability was 22.7%-39.4%. The difference was significant when BCR was defined as a PSA-DT ≤ 3 months and ≤ 6 months. Application of a PSA-DT ≤ 6 months yielded the highest c-index (0.660). These two parameters complemented each other; for patients meeting both PSA parameters, the probability of DM was 39.5%-44.5%; for those not meeting either parameter, the probability was 0.0%-3.1%. Conclusion A serum PSA level > 0.8 ng/mL was a reasonable threshold for the definition of BCR after SRT. In addition, a PSA-DT ≤ 6 months was significantly predictive of subsequent DM, and combined application of both parameters enhanced predictability. Purpose This study proposed the optimal definition of biochemical recurrence (BCR) after salvage radiotherapy (SRT) following radical prostatectomy for prostate cancer.Materials and Methods Among 1,117 patients who had received SRT, data from 205 hormone-naïve patients who experienced post-SRT prostate-specific antigen (PSA) elevation were included in a multi-institutional database. The primary endpoint was to determine the PSA parameters predictive of distant metastasis (DM). Absolute serum PSA levels and the prostate-specific antigen doubling time (PSA-DT) were adopted as PSA parameters.Results When BCR was defined based on serum PSA levels ranging from 0.4 ng/mL to nadir+2.0 ng/mL, the 5-year probability of DM was 27.6%-33.7%. The difference in the 5-year probability of DM became significant when BCR was defined as a serum PSA level of 0.8 ng/ml or higher (1.0-2.0 ng/mL). Application of a serum PSA level of ≥ 0.8 ng/mL yielded a c-index value of 0.589. When BCR was defined based on the PSA-DT, the 5-year probability was 22.7%-39.4%. The difference was significant when BCR was defined as a PSA-DT ≤ 3 months and ≤ 6 months. Application of a PSA-DT ≤ 6 months yielded the highest c-index (0.660). These two parameters complemented each other; for patients meeting both PSA parameters, the probability of DM was 39.5%-44.5%; for those not meeting either parameter, the probability was 0.0%-3.1%.Conclusion A serum PSA level > 0.8 ng/mL was a reasonable threshold for the definition of BCR after SRT. In addition, a PSA-DT ≤ 6 months was significantly predictive of subsequent DM, and combined application of both parameters enhanced predictability.