외국환 관리법 공청회 토론 ; 김진태 ( pp.110 ~ pp.112 )

김진태 한국금융연구원 1991 기타보고서 Vol.1991 No.-

전자파무반사실에서의 안테나 PIM 측정에 관한 연구

김진태,조인귀,정명영,최태구 한국전자파학회 2001 한국전자파학회논문지 Vol.12 No.7

안테나 PIM(Passive Intermodulation) 수준 측정은 안테나가 갖는 송.수신 특성 때문에 신뢰성을 보장받지 못하고 있으며, 전자파무반사실과 같은 측정환경에서 만들어지는 외부 PIM 근원에 의해 상당한 영향을 받는다. 본 논문에서는 안테나 PIM 측정에 이용되는 Reflect 방법에 대한 안테나 PIM 모델을 수립하였다. 모델의 이론적 해석(시뮬레이션)과 실험적 측정결과에서 동시에 관찰되는 PIM 수준의 Null Point 현상을 통해 전자파무반사실의 흡수체에서 발생하는 PIM 근원의 수준과 안테나로 인가되는 PIM 신호의 경로차가 안테나의 PIM 측정 결과에 상당한 영향을 미치고 있음을 확인하였다. Antenna PIM(Passive Intermodulation) level measurement results are rarely credited due to the external signal receiving characteristics of antenna, and seriously affected by the external PIM sources such as anechoic chamber absorber and antenna tower. In this paper, antenna PIM model for the Reflect PIM measurement method is presented. Through the null point phenomena of the PIM level obtained by antenna PIM model simulations and experimental results, we concluded that antenna PIM level measurements are greatly affected by the PIM level generated on the anechoic chamber absorber and the path differences of PIM signal reflected to the antenna.

소아과 입원환아에 관한 통계적 관찰 : 1983. 9 - 1987. 8

김진태,이기형,홍영숙,김순겸 최신의학사 1988 最新醫學 Vol.31 No.7

알루미노 실리케이트계 지오폴리머의 압축강도에 미치는 알카리 활성화제의 영향

김진태,서동석,김갑중,이종국,Kim, Jin-Tae,Seo, Dong-Seok,Kim, Gab-Joong,Lee, Jong-Kook 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.3

Portland cement has been restricted in applications to ecological area because of its environmental harmfulness and the $CO_2$ emission during a production process. Geopolymer materials attract some attention as an inorganic binder due to their superior mechanical and eco-friendly properties. In this study, geopolymer-based cement was prepared by using aluminosilicate minerals (flyash, meta-kaolin) with alkaline-activators and its compressive strength with concentration of alkaline-activators was investigated. Aluminosilicate-based geopolymers were obtained by mixing aluminosilicate minerals, alkaline solution (NaOH or KOH with different concentration) and water-glass under the vigorous stirring for 20 min. Compressive strength after curing at $30^{\circ}C$ for 3 days increased with the concentration of alkaline-activator due to the enhanced polymerization of the aluminosilicate materials and dense microstructure. Aluminosilicate-based geopolymer cement using KOH as an alkaline-activator showed high compressive strength compared with NaOH activator. In addition, geopolymer cement using fly-ash as a raw material showed higher compressive strength than that of meta-kaolin.

modeling and optimization reflected the effect of temperature for high temperature PEM fuel cells

김진태,김민진,손영준 한국에너지학회 2013 한국에너지공학회 학술발표회 Vol.2013 No.5

Sol-gel derived blue-emitting Sr3MgSi2O8:Eu2+ oxide phosphor for ultraviolet emitting diodes

김진태,황보승,Young-Sun Jeon,강보안,Yu-Sang Kim,황규석 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.4

Blue-emitting divalent europium-activated strontium magnesium orthosilicate (Sr3MgSi2O8 :Eu2+) oxide phosphor was synthesized through a low-temperature chemical solution process using tetraethyl orthosilicate and inorganic salts as starting materials. The transparent sol was preheated at 300 oC for 120 minutes and then the precursor was finally annealed at 900 oC for 240 minutes. Crystallinity, surface morphology and luminescent properties have been investigated. The phosphor emits blue luminescence with a peak wavelength at 457 nm under near-ultraviolet excitation at 365 nm.

알루미노실리케이트계 지오폴리머의 압축강도에 미치는 물유리의 영향

김진태,서동석,김갑중,이종국,Kim, Jin-Tae,Seo, Dong-Seok,Kim, Gab-Joong,Lee, Jong-Kook 한국재료학회 2010 한국재료학회지 Vol.20 No.9

Geopolymer is a term covering a class of synthetic aluminosilicate materials with potential use in a number of areas, but mainly as a replacement for Portland cement. In this study, geopolymers with fly ash and meta kaolin were prepared using KOH as an alkali activator and water glass. The effect of water glass on the microstructures and the compressive strength of the geopolymer was investigated. As the amount of water glass increased, the dissolved inorganic binder particles in the geopolymers increased due to polymerization, resulting in a dense microstructure. The meta kaolin-based geopolymer showed a better extent of polymerization and densification than that of the fly ash-based geopolymer. XRD data also suggested that polymerization in meta kaolin-based geopolymers should be active resulting in the formation of an amorphous phase with an increasing amount of water glass. The compressive strength of the geopolymer was also dependent on the amount of water glass. The compressive strength of the geopolymers from both fly ash and meta kaolin increased with an increasing amount of water glass because water glass improved the extent of polymerization of the inorganic binder and resulted in a dense microstructure. However, the addition of water glass to the geopolymer did not seem to be effective for the improvement of compressive strength because the meta kaolin-based geopolymer mainly consisted of a clay component. For this reason, the fly ash-based geopolymer showed a higher value of compressive strength than the meta-kaolin geopolymer.

프로골퍼들의 리더십유형 및 만족도의 차이

김진태 한국스포츠리서치 2007 한국 스포츠 리서치 Vol.18 No.6

Tissue Response to Implants of Hyaluronic Acid Hydrogel Prepared by Microbeads

김진태,이득용,김은중,장주웅,조남인 한국조직공학과 재생의학회 2014 조직공학과 재생의학 Vol.11 No.1

Hyaluronic acid hydrogels (HAHs) were synthesized by immersing the HA microbeads crosslinked with divinyl sulfone in phosphate buffered saline solution to assess the responses of tissues to the implant by means of the subchronic systemic toxicity and the intradermal implant test. The HAHs, prepared by the microbeads with an average diameter of 140 m and a swelling rate of 800 to 1200%, exhibited a porous network channeled with 10 m pores. The HAHs retained their space and structure by maintaining over 95% of the initial volume 12 weeks after injection to a rabbit. The histological analysis indicated that an acute inflammation, occurred in the rabbit 4 weeks after injection, was alleviated dramatically after 8 weeks. No capsule was formed. The HAHs had no subchronic systemic toxicity under the condition of this study and were considered non-irritant. The implants were excellent in biological synthesis and transplantation as evidenced by non-capsule reaction and disappearance of inflammatory cells. It can be concluded that the implants of HAHs are clinically safe and effective.

비보호 좌회전 지체도 추정모형의 개선

김진태 대한교통학회 2003 大韓交通學會誌 Vol.21 No.2

Highway Capacity Manual(HCM) provides an analytical delay estimation model to assist the evaluation of traffic at a signalized intersection. The model revised and included in the HCM published in the year 2000 reflects the results of recent studies and is utilized in various fields of transportation studies. For the implementation of the model in the case of permitted left turns, the HCM supplement provides a computational procedure to adjust the saturation flow rate of permitted left turns. The model however, is originally designed for a protected movement and thus underestimates the delay of permitted left turns due to its dif- ference right-of-way nature. This document describes (1) a review of the theoretical background of the HCM delay estimation model, (2) problems embedded in the model for the delay estimation of permitted left turns, (3) a proposed model developed in this study to improve the delay estimation for permitted left turns and (4) a set of verification tests. In order to reflect various traffic and control conditions in the test, simulation studies were performed to by using the field data based on 120 different permitted left-turn scenarios. Comparison studies conducted between sets of delays estimated by the HCM and the proposed models against a set of the CORSIM delays and showed that the proposed model improved the estimation of the permitted left-turn delays. The explanatory variable of the relationship between the HCM delay and the simulation delay was 0.47 and the one between the delay estimated by the proposed model and the simulation delay was 0.77. 미국 도로용량편람(HCM)은 도심부 신호 교차로 운영상태 평가를 돕기 위하여 지체도 추정 수리모형을 제시하고 있다. 2000년도 개정판 HCM모형은 전문가들의 최근(up-to-date) 연구결과가 반영된 것이며 많은 교통 공학자들에 의해 실무 및 연구에 활용되고 있다. HCM은 비보호 좌회전 움직임의 경우, 별도의 부가절차를 통해 포화교통류율을 보정할 것을 제시하고 있다. 그러나 HCM 지체도 산정 모형식은 보호현시 직진 움직임을 기준으로 설계된 모형이기 때문에 비보호 좌회전 움직임의 지체도를 과소 추정하는 문제점을 내제한다.본 논문에서는 (1)HCM지체도 모형의 설계과정을 검토하고 (2)이를 토대로 HCM 지체도모형을 통한 비보호 좌회전 지체도 추정에 문제가 있음을 지적하고 (3)새로운 비보호 좌회전 지체도 추정 수리모형을 제안한다. 다양한 교통상황, 제어상황을 현장실험에서 통제함에 어려움이 있어 모의실험을 통한 제안모형의 검증을 수행하였다. 검증을 위해 마련된 120가지 경우의 다양한 비보호 좌회전 교통상황에서 (1)CORSIM 모의실험 지체도, (2)HCM 모형추정 지체도, (3)제안된 모형추정 지체도를 비교하였으며, 비교분석 결과 모의실험 지체도를 기준으로 HCM 지체도 추정모형은 설명력이 0.47로, 제안된 모형의 설명력은 0.77로 분석되었다.본 논문은 과학기술부(한국과학재단)에서 지원한 첨단도로연구센터의 연구수행 결과입니다.