• 자원환경지질
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• 제48권3호
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• pp.241-246
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• 2015

Helicobacter pylori는 사람의 위점막에서 발견되는 전염성이 있는 중요한 병원균이다. 장기간 기생하면서 만성위염, 소화성궤양, 위 변연부 B세포 림프종, 그리고 위암을 일으키는 세균으로 알려져 있다. 국내에서는 프로톤펌프 억제제(proton pump inhibitor, PPI)와 두 가지 항생제(amoxicillin, clarithromycin)를 포함하는 표준 삼제 요법을 1차 치료로 사용하여 왔으나, 점점 증가하고 있는 항생제 내성으로 인해 제균율은 점차 감소하고 있다. 여기서는 H. pylori의 현재의 치료법들과 이들 치료법들의 문제점들을 검토하고, 표적치료의 필요성과 표적치료에 활용할 수 있는 약물전달체로서의 점토광물의 가능성에 대해 알아보고, 이들을 이용한 새로운 치료 방향에 대한 향후 연구계획 등에 대해서 논하고자 한다.

• 동력기계공학회지
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• 제19권5호
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• pp.12-16
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• 2015

$TiO_2$ nanoparticle can be used for the improvement of performance of the epoxy resin composites. In this study, the effect of the size of $TiO_2$ nanoparticle on the mechanical properties for the epoxy resin composites was investigated. The size of $TiO_2$ nanoparticle was easily controlled by heat treatment. The heat treatment of $TiO_2$ nanoparticle was conducted between $700^{\circ}C$ and $900^{\circ}C$. The obtained size of $TiO_2$ nanoparticle was 20 nm, 100 nm and 200 nm respectively. As the diameter of $TiO_2$ nanoparticle is smaller, the epoxy resin composite specimen showed higher tensile strength. It was also found that Vickers hardness of epoxy resin was increased by the addition of $TiO_2$ nanoparticle. But the size of $TiO_2$ nanoparticle did not strongly affected to the Vickers hardness of this material. The fracture surface of epoxy resin showed clear difference by the size of $TiO_2$ nanoparticlet.

• 상하수도학회지
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• 제24권3호
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• pp.295-305
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• 2010

Role of the perforated pipe is to drain the water with equal pressure and velocity through the holes of perforated pipe. The perforated pipe is being used in many processes of water treatment system, however, the design parameter of perforated pipe is not standardized in korea. In this study, we have found the design parameter of perforated pipe in the water treatment system using the Computational Fluid Dynamics (CFD). The uniformity of outflow from the perforated pipe is directly affected according to area ratio(gross area of holes/surface area of the perforated pipe). In other words, the uniformity of outflow is improved as area ratio is smaller. Also, at the same area ratio, the uniformity of outflow is improved as number of holes is increase. Specially, in case of the two holes per length of pipe diameter(2/D) shows the most uniformity of outflow and the best hydraulic with the smaller pressure drop. The uniformity of outflow is aggravated and the pressure drop of pipe is decrease as length of pipe is longer. In case of that pipe length is 10m and above, the pressure drop decreased about 30% when diameter ratio is 40% with 0.2% of area ratio by comparison with 0.1% of area ratio.

• 한국세라믹학회지
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• 제31권11호
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• pp.1337-1345
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• 1994

Glasses in the system of 45CaO-25TiO2-30P2O5 containing 1 mole% of M2O(M=Li, Na, K) were melted and crystallized. And their crystal phases were Ca3(PO4)2, CaTi4(PO4)6, and TiO2. Porous glass-ceramics with skeleton of two crystal phase CaTi4(PO4)6 and TiO2 were prepared by selective leaching of Ca3(PO4)2 with 0.1 N-HCl. Glass transition temperature(Tg) and crystallization temperature(Tc) were decreased by addition of 1 mole% alkali metal oxide. Pore size of porous glass-ceramics was increased with increasing heat treatment temperature and its dependence on heat treatment temperature was decreased with addition of Na2O and K2O. It was found that porous glass-ceramics of parent glass and containing 1mole% M2O(M=Li, Na, K) composition had maximum specific surface area, porosity and maximum of crystallzed phase by heat treatment at 80$0^{\circ}C$, 76$0^{\circ}C$, 78$0^{\circ}C$, 80$0^{\circ}C$ respectively.

• KIEAE Journal
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• 제11권6호
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• pp.133-138
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• 2011

This paper presents energy self-sufficiency simulated in municipal wastewater treatment plants (WWTPs) by adopting solar energy production systems that were simulated by varying azimuth and super-hydrophilic coating on the surface of photovoltaic (PV). Relative to the national average energy consumption in WWTPs, the employment of 100 kW PV system was simulated to achieve 2.75% of energy self-sufficiency. The simulated results suggested that the installation of PVs toward South or Southwest would produce the highest energy self-sufficiency in WWTPs. When super-hydrophilic coating was employed in the conventional PV, 5% of additional solar energy production was achievable as compared to uncoated conventional PV. When 100 kW of PV system was installed in a future test-bed site, Kihyeung Respia WWTP located in Yongin, South Korea, the energy self-sufficiency by solar power was simulated to be 1.77%. The simulated solar power production by azimuth and super-hydrophilic coating will be useful reference for practitioners in designing the solar PV systems in the WWTPs.

• 한국양식학회지
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• 제6권4호
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• pp.311-321
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• 1993

Ammonia accumulation is regarded as the limiting factor of the first priority in water qualities of aquatic culture systems. Nitrification efficiency and characteristics in seawater were evaluated using Rotating Biological Contactor (RBC) process as a part of the recycling water treatment facilities for marine fish culture system. Ammonia removal efficiency regarded 99.7 to $83.7\%$ at the ammonia surface loading rates of 48 to $393 mg/m^2$ -day. RBC process was able to withstand to the fluctuation of influent ammonia concentrations and loading and produced the stable effluent. The mathematical model on the fixed-film biological reactor developed by Kornegay seemed to be suitable to RBC process kinetic evaluation for the recycling water treatment of the marine fish culture system. Area capacity constant (P) and half-velocity constant (Ks) in the model were 0.188g/m^2$-day and 1.25mg/l, respectively.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.552-552
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• 2013

In our study we consider Al2O3 ceramic substrates for Plasma Surface Treatments in order to improve deposited diamond surface and increase diamond deposition rate by applying DBD (Dielectric Barrier Dischrge) system. Because Plasma Surface Treatments was used as a modification method of material surface properties like surface free energy, wettability, and adhesion. By applying Plasma Surface Treatments diamond films are deposited on the Al2O3 ceramic substrates. DC Arc Plasmatron with mathane and hydrogen gases is used. Deposited diamond films are investigated by SEM (Scanning Electron Microscopy), AFM (Atomic Force Microscopy) and XRD (X-ray Diffractometer). Then the C-H stretching of synthetic diamond films by FTIR (Fourier Transform Infrared Spectroscopy) is studied. As a result, nanocrystalline diamond films were identified by using SEM and diamond properties in XRD peaks at (111, $43.8{\Box}$, (220, $75.3{\Box}$ and (311, $90.4{\Box}$ were shown. Absorption peaks in FTIR spectrum, caused by CHx sp3 bond stretching of CVD diamond films, were identified as well. Finally, we improved such parameters as depostion rate ($2.3{\mu}m$/h), diamond surface uniformity, and impurities level by applying Plasma Surface Treatments. These experimental results show the importance of Plasma Surface Treatments for diamond deposition by a plasma source.

• 한국콘텐츠학회논문지
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• 제12권5호
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• pp.303-310
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• 2012

방사선 치료에 있어서 정확한 환자 포지셔닝과 셋업은 치료의 성패를 좌우할 수 있는 중요한 인자이다. 기존의 방사선 치료실내에 장착된 3-laser system을 이용한 셋업에서, 최근에는 체표면 윤곽 스캐닝 시스템(C-Rad system)의 사용이 시도되고 있다. 체표면 윤곽 스캐닝 시스템의 유용성을 평가하기 위하여 C-Rad system과 3-laser system을 이용한 셋업 오차의 정확도를 비교, 평가함으로써 임상에서의 유용성을 확인하고자 하였다. 인체부위는 내부적인 움직임이 없고, 고정용구의 적용이 간편한 두경부로 한정하였으며, Alderson Rando anthropomorphic phantom과 두경부에 병변이 있는 방사선 치료 환자 10명을 대상으로 하였다. Phantom을 대상으로 한 C-RAD system의 셋업 에러 평균과 표준편차는 X축 $0.55{\pm}0.51mm$, Y축 $-0.2{\pm}0.523mm$, Z축 $-0.85{\pm}0.587mm$로 나타났으며, 환자를 대상으로 한 실험에서는 X축 $-0.05{\pm}0.621mm$, Y축 $0.075{\pm}0.755mm$, Z축 $-1.025{\pm}0.617mm$로 산출되어, 전반적으로 3-laser system에 비해 셋업의 정확도가 우수하였으나, Z축의 에러 발생률은 C-RAD system이 약간 높게 나타났다. 체표면 윤곽 스캐닝 시스템은 두경부의 방사선 치료 시에 정확한 포지셔닝을 유도함으로써 셋업오차를 최소화 시키는데 기여할 것으로 사료된다.F

• 대한한방내과학회지
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• 제33권1호
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• pp.14-25
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• 2012

Objectives : To observe physiological changes during clinical acupuncture treatment. Methods : We recruited 40 healthy volunteers who had experienced an acupuncture treatment at least once within the past three years. The experimental group was divided into four groups according to the needling site and frequency of electrical stimulation. Sites consisted of abdomen and legs. Frequencies consisted of 100 Hz and 2 Hz. The procedures of experimental treatment consisted of seven phases, Resting I phase (Resting I), Needle insertion phase (Insertion), Maintenance of needle insertion I phase (Maintain I), Electrical stimulation phase (ES), Maintenance of needle insertion II phase (Maintain II), Needle removal phase (Removal) and Resting II phase (Resting II). We measured the surface electromygraphy (SEMG) through an electrode on the frontalis muscle during all phases consecutively. Results : When SEMGs of all seven phases were analyzed, they significantly increased or decreased according to phases. SEMGs of Insertion, Maintain I, ES and Maintain II phase significantly increased more than RestingI in abdomen and legs groups. SEMGs of the abdomen group were measured as being $4.78{\pm}0.74{\mu}V$ on Resting I, $16.48{\pm}3.97{\mu}V$ on Insertion, $46.31{\pm}10.56{\mu}V$ on Maintain I, $45.88{\pm}9.72{\mu}V$ on ES, $45.56{\pm}9.69{\mu}V$ on Maintain II, $18.76{\pm}3.05{\mu}V$ on Removal, and $3.75{\pm}0.65{\mu}V$ on Resting II. SEMGs of the legs group were measured as being $3.34{\pm}0.35{\mu}V$ on Resting I, $12.11{\pm}1.76{\mu}V$ on Insertion, $36.74{\pm}6.99{\mu}V$ on Maintain I, $33.57{\pm}6.30{\mu}V$ on ES, $32.66{\pm}6.03{\mu}V$ on Maintain II, $14.08{\pm}2.15{\mu}V$ on Removal, and $2.88{\pm}0.32{\mu}V$ on Resting II. Conclusions : SEMG changed differently according to processes of acupuncture. Electrical stimulation showed different change of SEMG. Thus, acupuncture treatment may change the status of the autonomic nervous system.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2003년도 학술발표논문집
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• pp.575-578
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• 2003

Constructed wetlands have become a popular technology for treating contaminated surface and wastewater. In this study, the field experiment to reduce nonpoint source pollution from watershed runoff during rainy day using wetland and pond. TSS and T-N removal rate of wetland-pond system and pond-wetland system was 91% and 73%, 94% and 70%, respectively and values were same range. $BOD_5$ and T-P removal rate of pond-wetland system (38% and 78%) was higher than wetland-pond system (27% and 62%). overall, pond-wetland system is more useful than wetland-pond system to control NPS.