• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2003년도 춘계총회 및 연구발표회 초록집
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• pp.224.1-224
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• 2003

• 한국광학회:학술대회논문집
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• 한국광학회 2008년도 동계학술발표회 논문집
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• pp.249-250
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• 2008

We report on the visible photoluminescence of the Tb/Yb co-doped alumino-germano-silicate fibers for visible fiber laser application. By changing the concentration ratios of $Tb^{3+}$ to $Yb^{3+}$, we optimized the solution doping conditions and obtained the highest emission efficiency at 546nm. The luminescence intensity at 546nm was found to increase with the relative increase of $Tb^{3+}$ ions.

• Advances in materials Research
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• 제3권4호
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• pp.227-232
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• 2014

$Ce^{4+}$, $Eu^{3+}$, $Tb^{3+}$ co-doped $Ca_3Si_3O_8F_2$ phosphor was synthesized via solid state reaction method using $CaF_2$, $CaCO_3$ and $SiO_2$ as raw materials for the host and $Eu_2O_3$, $CeO_2$, and $Tb_4O_7$ as activators. The luminescent properties of the phosphor was analysed by spectrofluorophotometer at room temperature. The effect of excitation wavelengths on the luminescent properties of the phosphor i.e. under near-ultraviolet (nUV) and visible excitations was investigated. The emission peaks of $Ce^{4+}$, $Eu^{3+}$, $Tb^{3+}$ co-doped $Ca_3Si_3O_8F_2$ phosphor lays at 480(blue band), 550(green band) and 611nm (red band) under 380nm excitation wavelength, attributed to the $Ce^{4+}$ ion, $Tb^{3+}$ ion and $Eu^{3+}$ ions respectively. The results reveal that the phosphor emits white light upon nUV (380nm) / visible (465nm) illumination, and a red light upon 395nm / 535nm illumination. RE ions doped $Ca_3Si_3O_8F_2$ is a promising white light phosphor for LEDs. The emission colours can be seen using Commission international de l'eclairage (CIE) co-ordinates. A single host phosphor emitting different colours under different excitations indicates that it is a potential phosphor having applications in many fields.

• 정보저장시스템학회논문집
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• 제1권2호
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• pp.127-131
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• 2005

We report a nanometer scale mark formation using a $PtO_x$ thin film or a TbFeCo rare-earth transition metal film and the mechanism. The multi-layer samples($ZnS-SiO_2/PtOx/ZNS-SiO_2,\;ZnS-SiO_2/TbFeCo/ZnS-SiO_2$) were prepared with a magnetron sputtering method on a polycarbonate or a glass substrate. By laser irradiation of approximately a few nanoseconds, nanometer scale marks were fabricated. During the fabrication process, the thin films were thermally reacted or inter-diffused during the laser irradiation. 75 nm bubble marks in the PtOx multi-layer sample by an approximately 4-ns laser irradiation. Inside the bubble mark, Pt particles with a few nanometer sizes are distributed. The $50{\sim}100$ nm bubble marks in the TbFeCo multi-layer sample by a few nanosecond laser irradiations. We will report the detail structure of the samples, the bubble mark formation process and the mechanism.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 추계학술대회 논문집 Vol.16
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• pp.344-347
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• 2003

The varistor properties of the ZPCCT-based ceramics, which are composed of Zn-Pr-Co-Cr-Tb oxides, were investigated with $Tb_4O_7$ content in the range of $0.0{\sim}1.0\;mol%$. As $Tb_4O_7$ content is increased, the ZPCCT-based ceramics exhibited very high densification based on increasing density in the range of $5.73{\sim}5.84\;g/cm^3$. The varitor voltage($V_{1mA}$) and nonlinear exponent($\alpha$) was increased in the range of 280.9 to 751.8 and 29.8 to 44.4 with increasing $Tb_4O_7$ content, respectively. In particular, the maximum $\alpha$ of 44.4 was obtained from 1.0 mol% $Tb_4O_7$ and the, minimum leakage current($I_{\ell}$) of $1.0\;{\mu}A$ was obtained from 0.5 mol% $Tb_4O_7$.

• 한국식품과학회지
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• 제37권2호
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• pp.149-153
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• 2005

중국산 일반메밀 1종과 쓴메밀 2종의 껍질과 종피을 제거한 배유의 성분과 호화성질을 비교 분석하였다. 일반메밀은 쓴메밀 보다 상당히 크고 삼각형에 가까우나 쓴메밀-1종은 길쭉한 형태를 취하고 있으며, 쓴메밀-2종은 삼각형에 골이 깊숙이 파져 있는 형태를 보였다. 메밀쌀 가루의 일반성분과 아미노산 함량은 시료간에 차이가 없었고, 루틴 함량은 쓴메밀이 일반메밀보다 22배 이상 많이 함유하고 있었다. 무기질 함량 중 철, 칼슘과 마그네슘함량은 쓴메밀에서 높았고, 아연, 망간과 인 함량은 일반메밀과 쓴메밀 사이에 큰 차이가 없었다. 신속점도계에 의한 호화패턴을 살펴보면 쓴메밀-2종이 최고점도, 최저점도와 breakdown에서 가장 높게 나타났으며, 쓴메밀-1종은 breakdown이 가장 낮은 값을 나타내었다. 쓴메밀의 setback은 일반메밀보다 약 2.2배 컸다. 메밀가루의 색도는 일반메밀과 쓴메밀 사이에 또한 쓴메밀 사이에도 뚜렷한 차이를 보였다.

• 한국재료학회지
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• 제4권2호
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• pp.233-240
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• 1994

Pt/Co인공격자다층막($[Pt10.7\;{\AA}/Co2.8\;{\AA}]{\times}12$)의 자기특성 및 기록특성이 시료제작시의 조건 (sputtering gas압력, sputtering gas 종류, buffer층의 유무 및 etching)에 따라 어떻게 변화하는지를 알아보았다. Pt/Co다층막의 자기특성은 Tb-Fe-Co계 아몰퍼스재료와 거의 동등한 특성이 얻어졌으며 이다층막을 이용한 광자기디스크의 기록특성은 kerr회전각, 1.23도, 기록 power 특성, 36dB(레이저파장: 780nm)을 나타내어 Pt/Co다층막이 차세대광자기디스크용 재료로서의 실용화가능성을 보여주었다.

• 한국식품저장유통학회지
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• 제15권1호
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• pp.161-168
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• 2008

말차, 오룡차, 홍차 및 보이차로 제조한 음료가 Cd에 중독된 SD계 흰쥐의 해독에 미치는 영향을 조사하였다. 관능검사 결과 일반 물 추출물에 비하여 색상, 향, 맛에 대한 기호도가 현저하게 향상되었으며, 종합적 기호도는 오룡차 음료가 4.18점, 홍차음료가 4.14점으로 말차음료나 보이차 음료의 $3.74{\sim}3.88$점에 비하여 높았다. SD계 흰쥐를 정상군 (NC), Cd 대조군(Cd-Co), Cd투여 말차음료 15% 급여군 (Cd-Gt), Cd투여 오룡차음료 15% 급여군(Cd-Ot), Cd투여 홍차음료 15% 급여군(Cd-Bt) 및 Cd투여 보이차음료 15% 급여군 식이군(Cd-R)의 6군으로 구분하여 5주간 사육하였다. 차 음료 식이군의 체중증가량은 NC군에 미치지는 못하였으나 Cd에 의하여 감소된 현상을 상당히 개선하였다. 식이효율, 뇨량 및 분변량은 각 실험군간의 유의적인 차이가 없었다. Cd의 투여는 간과 신장의 중량, 경골의 중량 및 대퇴골의 길이를 감소시켰으나 차 음료의 섭취로 다소 개선되었다. 혈청 AST 및 ALT 활성은 모두 Cd 투여군에서 현저하게 증가하는 경향을 보였으나 차 음료 급여군에서는 5%수준에서 유의적으로 감소되었다. 대퇴골의 조회분 함량은 Cd-Co군에서 40.72%, Cd 투여-차 음료 급여군에서는 $35.31{\sim}37.02%$로 차음료의 급여에 의하여 5%수준에서 유의적으로 감소하였다. 대퇴골의 조회분 함량은Cd-Co군에서 40.72%, Cd 투여-차 음료 급여군에서는 $35.3{\sim}37.02%$로 차음료의 급여에 의하여 유의적으로 감소하였다 대퇴골의 Cd함량은 NC군에서는 0.08 ppm이었으나 Cd-Co군은 123.28 ppm, 실험식이군에서는 $23.07{\sim}28.82 ppm$으로 차음료의 급여로 현저하게 감소하였으며, Ca 함량은 NC군에서 6700 ppm, Cd-Co군에서 3760 ppm, 실험식이군에서는 $4040{\sim}5420 ppm$이었다. 분변의 회분함량은 Cd-Bt군이 14.80%로 높았으나 기타 음료군은 Cd-Co군과의 유의적인 차이를 보이지 않았다. 분변의 Cd 함량은 NC군 0.02 ppm, Cd-Co군 2.06ppm, 실험식이군 $4.38{\sim}5.35ppm$로 차 음료 급여군에서 높았으며, 이와 대조적으로 Ca함량은 차음료 급여군에서 낮았다. 이상의 실험결과, 말차, 오룡차, 홍차 및 보이차로 제조한 음료는 상호간의 뚜렷한 차이는 없으나 모두 섭취한 Cd를 체외로 배설시킴으로서 Cd에 의한 장기 손상을 경감시켜 줄 수 있을 것으로 생각된다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제27권4호
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• pp.51-60
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• 2021

Purpose: Tuberculosis(TB) care unit in public health center should be carefully considered to be re-designed as an infection safety environment for both patient and healthcare workers. So, for the enhancement, this study analyses the facility requirements for co-using the screening clinic as a TB and other respiratory disease care unit. Methods: Not only screening clinic facility guidelines from "A Study for Standard Triage Design and Construction Document" but also the guidelines of TB care and related medical facility are reviewed; KDCA, CDC, ECDC and WHO as a TB care, and FGI and NHS for facility. The facility requirements are summarized space, approach, and mechanical requirement in order. By comparing the summary and screening clinic facility guidelines, supplementations are proposed for TB care unit setting. Results: The result of this study shows that both the space program and mechanical requirement of the screening clinic and that of TB care unit are almost identical and could be share, which include direct airflow or negative air pressure in an exam room. To increase functional and economical efficiency, however, it is necessary to consider a multi-functional negative pressured room, So care process may be re-designed based on a room type; face-to-face room or glass wall inbetween. Implications: The facility guidelines for TB care unit of a public health center should be developed to build a safe environment for infection control by reflecting its medical plan and budget.

• The Korean journal of internal medicine
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• 제39권2호
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• pp.306-317
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• 2024

Background/Aims: To determine whether metformin, which is considered a host-directed therapy for tuberculosis (TB), is effective in improving the prognosis of patients with TB and diabetes mellitus (DM), who have higher mortality than those without DM. Methods: This cohort study included patients who were registered as having TB in the National Tuberculosis Surveillance System. The medical and death records of matched patients were obtained from the National Health Information Database and Statistics Korea, respectively, and data from 2011 to 2017 were collected retrospectively. We classified patients according to metformin use among participants who used diabetes drugs for more than 28 days. The primary outcome was all-cause mortality during TB treatment. Double propensity score adjustment was applied to reduce the effects of confounding and multivariable Cox proportional hazard models were used to estimate adjusted hazard ratio (aHR) with 95% confidence interval (CI). Results: The all-cause mortality rate during TB treatment was lower (9.5% vs. 12.4%, p < 0.01) in the metformin user group. The hazard of death due to all causes after double propensity score adjustment was also lower in the metformin user group (aHR 0.76, 95% CI 0.67-0.86, p < 0.01). There was no significant difference in mortality between metformin users and non-users for TB-related deaths (p = 0.22); however, there was a significant difference in the non-TB-related deaths (p < 0.01). Conclusions: Metformin use in patients with TB-DM co-prevalence is associated with reduced all-cause mortality, suggesting the potential for metformin adjuvant therapy in these patients.