• 대한관절경학회지
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• 제17권1호
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• pp.1-5
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• 2013

목적: 저자들은 회전근개 전층 파열 환자에 대하여 관절경적 Ulsan University - Mason Allen - Suture Bridge (UU MA SB) 봉합법을 시행한 후 임상 결과를 분석하였다. 대상 및 방법: 2010년 9월부터 2010년 12월까지 회전근개 전층 파열을 관절경적 UU MA SB 봉합법으로 치료받은 15예를 대상으로 하였다. 술전, 12주, 6개월 추시 시 Korean shoulder score (KSS), American shoulder and elbow surgeon(ASES), University of California, Los Angeles (UCLA), visual analogue scale (VAS), 관절운동 범위측정을 이용한 평가를 시행하였다. 결과: 최종 추시 결과 술전 평균 KSS $51.4{\pm}13.0$에서 $92.0{\pm}6.9$으로 호전되어 유의한 차이(p<0.05)를 보였으며, ASES score 역시 평균 $15.9{\pm}6.5$에서 $27.1{\pm}2.4$로 호전되어 유의한 차이(p<0.05)를 보였다. UCLA score $15.1{\pm}3.9$에서 $31.9{\pm}3.6$으로, VAS $7.2{\pm}2.3$에서 $0.9{\pm}1.2$로 술전보다 술후 결과가 유의하게(p<0.05) 향상되었다. 결론: 회전근개 전층파열 환자에서 관절경적 UU MA SB 봉합술을 시행하여 동통의 감소 및 견관절 기능 향상의 우수한 결과를 얻을 수 있었다.

• 공업화학
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• 제31권6호
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• pp.646-652
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• 2020

본 연구는 200~500 ℃ 영역에서 NOx를 제어하기 위한 NH3-SCR 실험을 수행하였다. V/Sb/TiO2 조성의 촉매에서 Sb/TiO2의 소성온도를 다르게 하여 반응활성 실험을 진행하였다. 그 결과 Sb/TiO2의 소성온도가 600 ℃일 때, 가장 효율이 우수하였으며, 특히 반응온도 250 ℃에서 NOx 전환율이 80% 가까이 나오는 것을 확인할 수 있었다. 이와 같이 다른 소성온도로 제조하였을 때 활성증진의 원인을 도출하기 위하여 H2-TPR, XRD, BET, Raman, XPS 분석을 진행하였다. 그 결과 활성이 우수하였던 Sb/TiO2의 소성온도를 600 ℃로 제조하였을 때, VSbO4가 생성되는 것을 확인하였으며, 이 종이 생성됨으로써 V의 비 화학양론종이 증가하여 V/Sb/TiO2의 NOx 전환율이 우수한 것으로 판단된다.

• 한국지하수토양환경학회지:지하수토양환경
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• 제19권1호
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• pp.8-25
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• 2014

The aims of this study were to determine concentrations of selected metals in Asian and non-Asian dust collected in Daejeon, Korea between February 2008 and December 2008 and to estimate the pollution level. The geochemical analyses of Asian dust (AD) and Non Asian dust (NAD) show that the mean concentrations of As, Cd, Cu, Pb, Zn, Zr, Sb, Mo and S reached levels up to 16, 209, 31, 43, 81, 28, 31, 122 and 302 times higher, respectively, than those in uncontaminated Chinese desert soils. These results indicate that both AD and NAD serve as an atmospheric repository for trace and heavymetal accumulation. The the enrichment factor (EF) and pollution index (PI) show that AD and NAD were severely contaminated by S, Mo, Zr, Cd, Pb, Zn, Sb, Cu, and As. All indices for these metals showed either strong or notably high level of pollution relative to Chinese desert soil, principally due to the severe atmospheric pollution derived from anthropogenic activities in heavily industrial Chinese cities. Therefore, Mo, Cd, Zr, As, Cu, Sb, Pb, and Zn are the ones most strongly affected by anthropogenic inputs such as airborne pollutants.

• 센서학회지
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• 제31권4호
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• pp.271-277
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• 2022

We analyzed the effects of the interface trap on the output characteristics of an inversion mode n-channel GaN Schottky barrier (SB)-MOSFET based on the N_it distribution using TCAD simulation. As interface trap number density (N_it) increased, the threshold voltage increased while the drain current density decreased. Under N_it=5.0×10¹⁰ cm^-2 condition, the threshold voltage was 3.2 V for V_DS=1 V, and the drain current density reduced to 2.4 mA/mm relative to the non-trap condition. Regardless of the N_it distribution type, there was an increase in the subthreshold swing (SS) following an increase in N_it. Under U-shaped N_it distribution, it was confirmed that the SS varied depending on the gate voltage. The interface fixed charge (Q_f) caused an shift in the threshold voltage and increased the off-state current collectively with the surface trap. In summary, GaN SB-MOSFET can be a building block for high power UV optoelectronic circuit provided the surface state is significantly reduced.

• 한국전기전자재료학회논문지
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• 제23권10호
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• pp.763-766
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• 2010

By improving the conducting process of metal source/drain (S/D) in direct contact with the channel, schottky barrier metal-oxide-semiconductor field effect transistors (SB MOSFETs) reveal low extrinsic parasitic resistances, offer easy processing and allow for well-defined device geometries down to the smallest dimensions. In this work, we investigated the arrhenius plots of the SB MOSFETs with different S/D schottky barrier (SB) heights between simulated and experimental current-voltage characteristics. We fabricated SB MOSFETs using difference S/D metals such as Cr (${\Phi}_{Cr}$ ~4.5 eV) and Ni (${\Phi}_{Ni}$~5.2 eV), respectively. Schottky barrier height (${\Phi}_B$) of the fabricated devices were measured to be 0.25~0.31 eV (Cr-S/D device) and 0.16~0.18 eV (Ni-S/D device), respectively in the temperature range of 300 K and 475 K. The experimental results have been compared with 2-dimensional simulations, which allowed bandgap diagram analysis.

• 대한영양사협회학술지
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• 제17권4호
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• pp.387-402
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• 2011

The purpose of this study was to examine the dietary behaviors, processed food preferences, and awareness levels of nutrition labels among female university students living in middle region by breakfast eating. A total of 243 students (breakfast eating group: 153, breakfast skipping group: 90) were surveyed from April to May of 2011. The results are summarized as follows: Skipping breakfast (SB) group had a significantly higher frequency of skipping lunch and dinner compared with the eating breakfast (EB) group (P<0.05, P<0.01, respectively). In the EB group, food labels were identified sometimes (31.8%), frequently (29.1%), and rarely (28.5%). In the SB group, food labels were identified rarely (33.3%), sometimes (27.8%), and frequently (26.7%). The EB group used food labels for comparing price and weight of products more frequently than the SB group (P<0.05). In the EB group, nutrition labels were identified sometimes (38.0%), frequently (28.1%), and rarely (24.8%). In the SB group, nutrition labels were identified rarely (32.6%), sometimes (30.3%), and frequently (21.4%). The EB group used food labels for identifying nutrient contents more often and for weight control more less than the SB group (P<0.05, P<0.05, respectively). The main reason for not identifying nutrition label of the processed foods was 'not being interested (55.5%)' in the SB group (P<0.05). Therefore, education programs that emphasize the importance of eating breakfast, and reading food and nutrition labels need to be developed for university students.

• 한국분말재료학회지
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• 제31권2호
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• pp.119-125
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• 2024

The n-type Bi_2-xSb_xTe₃ compounds have been of great interest due to its potential to achieve a high thermoelectric performance, comparable to that of p-type Bi_2-xSb_xTe₃. However, a comprehensive understanding on the thermoelectric properties remains lacking. Here, we investigate the thermoelectric transport properties and band characteristics of n-type Bi_2-xSb_xTe₃ (x = 0.1 - 1.1) based on experimental and theoretical considerations. We find that the higher power factor at lower Sb content results from the optimized balance between the density of state effective mass and nondegenerate mobility. Additionally, a higher carrier concentration at lower x suppresses bipolar conduction, thereby reducing thermal conductivity at elevated temperatures. Consequently, the highest zT of ~ 0.5 is observed at 450 K for x = 0.1 and, according to the single parabolic band model, it could be further improved by ~70 % through carrier concentration tuning.

• 한국광물학회지
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• 제27권1호
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• pp.31-40
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• 2014

본 연구에서는 유연탄을 원료로 하는 국내 모 화력발전소에서 발생하는 비회(fly ash)와 석탄회 매립염호수(saline ash pond)에 대하여 지구화학적으로 조사함으로써 석탄회와의 반응에 의한 매립호수의 수질변화와 염수와의 반응에 의한 석탄회내의 원소용출 특성을 고찰하였다. 이를 위해, 각각 1개씩의 비회와 바닥재, 그리고 7개의 매립호수 수질시료를 채취하였다. 이 중, 비회와 바닥재, 그리고 2개의 수질시료는 총 55개 항목의 미량금속원소에 대한 분석을 수행하였다. 비회 내에는 Cu, Zn, Ga, Ge, Se, Cd, Sb, Au, Pb, B 등과 같은 친황원소들의 함량이 비교적 높게 나타났다. 하지만, 매립호수 내에서는 해수에 비하여 As, Ba, Co, Ga, Li, Mn, Mo, Sb, U, V, W, Zr 등이 상대적으로 농집되어 있었다. 또한, 각 원소에 대하여 비회 내의 농도와 매립호수 내의 농도 비를 비교한 결과, Ag, Bi, Li, Mo, Rb, Sb, Sc, Se, Sn, Sr, W 등이 타 원소들과 비하여 매립호수에 농집되어 있는 것으로 나타났다. 이러한 결과는 상대적 휘발정도에 의해 일부 금속원소가 비회의 표면에 농집된다 하더라도 금속원소의 용출특성이 용해도나 흡착처럼 각 원소의 지화학적 거동 특성에 영향 받음을 의미하는 것이다.

• 한국도로학회논문집
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• 제3권4호
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• pp.93-103
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• 2001

본 연구에서는 콘크리트 덧씌우기를 위한 SB 라텍스개질 콘크리트의 현장적용성 평가를 위해 현장에서 모빌믹서를 이용하여 배합실험 하여 작업성, 강도발현특성 및 투수특성을 등을 고찰하였다. 이를 위해 주요 실험변수는 라텍스 혼입률(0, 5, 10, 15, 20%), W/C (31, 33, 35 37%), S/a(55, 56, 57, 58%) 를 선정하였으며, 초기슬럼프, 슬럼프 손실, 공기량, 압축강도 및 휨인장강도 발현특성, 염화이온 촉진 실험 등을 수행하였다. 실험결과, 모빌믹서차량을 이용해서 SB라텍스개질 콘크리트를 현장에서 배합하였을 때 충분한 작업성 및 양질의 콘크리트를 생산 할 수 있었으며 목표 압축강도와 휨강도를 얻을 수 있었다. 모빌믹서 차량을 이용한 배합은 실내실험에서 제시된 최적배합의 동일한 작업조건을 얻기 위한 물-시멘트비가 다소 낮아지는 것으로 나타났다. 초기 배출 슬럼프 $19{\pm}3cm$을 얻기 위한 실내실험 배합은 물-시멘트비 37%였으나, 모빌믹서차량을 이용한 경우는 33%의 물-시멘트비를 나타내었다. 또한, 현장 적용에 있어서도 모빌믹서를 이용한 정확한 계량 및 라텍스의 혼입으로 양질의 콘크리트 생산 및 성능개선을 기대할 수 있음을 확인하였다.

• 한국물환경학회지
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• 제31권5호
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• pp.460-467
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• 2015

We analyzed the formation of phytoplankton community and the occurences of odorus compound from benthic cyanobacteria in North, South Han-River, Paldang-Lake and Kyeongan-Stream sediments. Sediments were incubated in different water temperature. Akinetes were found (0~500 cells/g) with the highest number on sediment in Yangsoo railroad bridge (YC). The result showed that Anabaena ranged between $0.02{\sim}0.53{\times}10^3cells/mL$ in Sambong (SB), YC, Mukhyen-Stream (MS), Paldang-Lake (P2) and Kyeongan-Stream (KK). The total 68 taxa of phytoplankton were observed during the incubation period. A standing crop of phytoplankton was in the range of $0.13{\sim}8.97{\times}10^3cells/mL$ and Microcystis appeared in SB, YC, P2 and KK sites with $20{\sim}25^{\circ}C$ temperature. In South Han-River (P3), Oscillatoria tenuis was dominant at $25^{\circ}C$ temperature. The concentration of geosmin was the highest in SB-$15^{\circ}C$ (25.5 ng/L), and the concentration of 2-MIB was the highest in P3-$25^{\circ}C$ (286.8 ng/L). Odorous compounds were detected in all the temperature conditions from each site. Our results indicate that the dominant benthic cyanobacteria (O. tenuis, O. limosa, Phormidium tenue and Pseudanabaena limnetica) have high correlation with the occurrence odorous compounds and 2-MIB.