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하수 2차 처리수 재이용을 위한 저압 및 중압 고도산화시스템의 성능평가
안규홍,안석,맹승규,김기팔,홍준석,정민우,권지향,Ahmed, Zubair 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4
In the present study, the feasibility of UV/H₂O₂ systems was investigated using low and medium-pres sure lamps on biologically treated wastewater effluents for secondary effluent reclamation. Two types of UV lamps were used as the light sources (a 33W lowpressure mercury lamp and a 350-W mediumpressure mercury lamp). The results from these UV systems showed that the removal of organic compounds could be achieved in the contact time of longer than 30min (i.e., low UV doses). Efficiencies of color removal and disinfection were far better than those of organic matters measured as TOC, DOC and TCOD_(cr). In the low pressure lamp UV system, it has been found that DOC and color removals were 60.9 and 86.2% with 50㎎/L of H₂O₂ and contact times of 30 minute, respectively. Whereas, with the mediumpressure lamp UV system, TOC, DOC and color removal were 27.1, 5.6 and 95% with 14.3㎎/L of H₂O₂ and 14 minute of contact times, respectively. Both systems could be applied for the reclamation of secondary effluent treated with biological treatment processes.
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Production of valued materials from squid viscera by subcritical water hydrolysis.
Uddin, M Salim,Ahn, Hyang-Min,Kishimura, Hideki,Chun, Byung-Soo The Academy 2010 Journal of environmental biology Vol.31 No.5
<P>Subcritical water hydrolysis was carried out to produce valued materials from squid viscera, the waste product of fish processing industries. The reaction temperatures for hydrolysis of rawand deoiled squid viscera were maintained from 180 to 280 degrees C for5 min. The ratio of material to water forhydrolysis was 1:50. Most of the proteins from deoiled squid viscera were recovered at high temperature. The protein yield in raw squid viscera hydrolyzate decreased with the rise of temperature. The reducing sugar yield was higher at high temperature in subcritical water hydrolysis of both raw and deoiled squid viscera. The highest yield of amino acids in raw and deoiled squid viscera hydrolyzates were 233.25 +/- 3.25 and 533.78 +/- 4.13 mg g(-1) at 180 and 280 degrees C, respectively. Most amino acids attained highest yield at the reaction temperature range of 180-220 degrees C and 260-280 degrees C for raw and deoiled samples, respectively. The recovery of amino acids from deoiled squid viscera was about 1.5 times higher than that of raw squid viscera.</P>
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Scientific Comparison Study on the Joseon Dynasty Palace Roof Tiles and Modern Handmade Roof Tiles
Ahn, Kyoung Suk,Lee, Min Hye,Kim, Ji Hye,Ha, Ji Hyang,Jang, Won Jin,Kim, Du Hyeon,Jeong, Ji Youn,Han, Min Su The Korean Society Of Conservation Science For Cul 2021 보존과학회지 Vol.37 No.1
The purpose of this study is to scientifically analyze physicochemical characteristics of the roof tiles used for palaces in the Joseon Dynasty which stored in Changdeokgung material storage and Seooreung Jaesil and the modern handmade ones which made by N company to understand the differences between their manufacturing techniques. Through chromaticity, cross-sectional observation, component analysis, and crystal structure analysis, it was possible to confirm the physicochemical properties and fired properties of the roof tile. Roof tiles from the Joseon Dynasty have a wider colorimetric range and higher apparent porosity and water absorption, on average, than the modern roof tiles. The cross section of the Joseon Dynasty roof tiles shows that most clay minerals have not been vitrified, remaining in the form of atypical particles, while the modern roof tiles have denser clay materials. X-ray diffraction analysis identified low-temperature minerals such as micas in Joseon roof tiles but no peak of these minerals was observed in the modern roof tiles, implying that the modern ones are fired at higher temperature than the Joseon ones. Therefore, the modern roof tiles are fired at higher temperature and have higher density than the Joseon ones due to the use of pugmills. The general content of main ingredients was similar between the two. Additionally, the principal component analysis of trace elements in the Joseon roof tiles showed that most samples were from similar areas. It seems that the Joseon roof tiles were manufactured using soils supplied from a specific region at the same timeframe and their consistency in the content of principal components implies that they also have similar mix proportions of clay.
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Analysis of safety incidents in general wards patients applying home mechanical ventilator
( Min Hye Seo ),( Hyang Sook Kim ),( Song Yee Han ),( Ji Na Jung ),( Eun Sun Ahn ),( Kyung Soo Chung ),( Mu Seok Park ),( Kyung Won Kim ),( Ah Young Leem ),( So Young Park ) 대한결핵 및 호흡기학회 2019 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.127 No.0
Background: Improved intensive care unit (ICU) care has induced a rapid increase in the number of patients requiring prolonged home mechanical ventilation (HMV) in general wards. This study investigated the types and characteristics of safety incidents in patients undergoing HMV in general wards. Methods: In this retrospective study, we collected data on patient safety incidents from electronic medical records (EMR) and journal recorded by respiratory nurses who manage HMV in a 2000-bed university tertiary referral hospital in Seoul, South Korea. The degree of harm in each incident analyzed by the World Health Organization classification. Results: We identified 521 patients using a HMV from August 2018 to July 2019. The median number of using a HMV days was 51 days. There were 229 patient safety incidents related to HMV. The frequency of incidents was the highest in the ward containing less experienced nurses about managing HMV (n=158, 69.9%). These incidents occurred most frequently on weekdays (n=124, 54.9%) and between 2 pm and 10 pm (n=118, 52.2%). Main safety incidents were breathing circuit issues of HMV (n=68, 30.1%) and the lack of care by the medical staffs (n=123, 54.4%). In total, 19 (8.4%) events were accompanied by moderate harms and 29 (12.8%) by mild harms. These events caused one patient to be transferred to the ICU due to deterioration. Conclusions: Patient safety incidents related to HMV were relatively high. Early detection and rapid response system to deterioration of patients using HMV on general wards is absolutely necessary. Additionally, it is important to provide medical staffs and caregivers with continuing education and training.
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Ahn, Sung-Jun,Baek, Jong Min,Cheon, Yoon-Hee,Park, Sun-Hyang,Lee, Myeung Su,Oh, Jaemin,Kim, Ju-Young Institute for Advanced Research in Asian Science a 2015 The American journal of Chinese medicine Vol.43 No.4
<P>Angelica tenuissima has been traditionally used in oriental medicine for its therapeutic effects in headache, toothache, and flu symptoms. It also exerts anti-inflammatory activity via the inhibition of the expression of cyclooxygenase-2 (COX-2). However, the effect of Angelica tenuissima on osteoclast differentiation has not been identified until recently. In this study, we first confirmed that Angelica tenuissima water extract (ATWE) significantly interrupted the formation of tartrate-resistant acid phosphatase (TRAP)-positive multinucleated cells (MNCs) in a dose-dependent manner without any cytotoxicity. Next, we clarified the underlying mechanisms linking the suppression effects of ATWE on the receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclastogenesis. At the molecular level, ATWE induced the dephosphorylation of c-Jun N-terminal kinase (JNK) and Akt and decreased the degradation of IκB in RANKL-dependent early signaling pathways. Subsequently, ATWE caused impaired activation of the protein and mRNA levels of c-Fos and nuclear factor of activated T cell c1 (NFATc1). Moreover, the disassembly of filamentous actin (F-actin) ring and anti-resorptive activity of mature osteoclasts were triggered by ATWE treatment. Although ATWE did not enhance osteogenesis in primary osteoblasts, our results showed that ATWE is a potential candidate for anti-resorptive agent in osteoporosis, a common metabolic bone disorder.</P>
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Ahn, Jin Hyang,Yun, Younghee,Kim, Min Hee,Ko, Seoung-Gyu,Kim, Kyu Seok,Choi, Inhwa Elsevier 2018 Complementary Therapies in Medicine Vol.40 No.-
<P><B>Abstract</B></P> <P><B>Background</B></P> <P>Atopic dermatitis (AD) is a chronic relapsing eczematous skin disease with an increasing prevalence. In Korea, Jaungo is a traditional medicinal ointment, which is commonly used for treating skin wounds.</P> <P><B>Objective</B></P> <P>Thus, we aim to explore the basic clinical efficacy and safety data for Jaungo in patients with AD.</P> <P><B>Methods</B></P> <P>This study was a pilot randomized, double-blind, placebo-controlled, single-center trial with three groups. The participants in treatment group 1 applied Jaungo to the lesion twice a day for 3 weeks. Those in treatment group 2 applied Jaungo and placebo ointments to the lesion once a day for 3 weeks. Those in the placebo group applied placebo ointments to the lesion twice a day for 3 weeks. The Eczema Area and Severity Index and SCORing Atopic Dermatitis scores, transepidermal water loss value, and Dermatology Life Quality Index score were assessed. The outcomes used to evaluate safety were the Draize score, blood test results, and expert opinion.</P> <P><B>Results</B></P> <P>In total, 28 patients (82.4%) completed the study. During the study, significant decline of EASI scores in treatment group 2 and placebo group was observed (p < 0.05). And there was significant decline of SCORAD scores in treatment group1 and placebo group (p < 0.05). Patients in all groups showed decreased TEWL and DLQI scores with no significant difference. There was significant decline of IL-17 in all groups (p < 0.05). No serious adverse event was observed.</P> <P><B>Conclusion</B></P> <P>This is the first study that has explored the potential therapeutic effect of Jaungo as a complementary therapy for AD. However, further large study with adjusting placebo ingredients is needed to confirm the effectiveness of Jaungo in patients with chronic-phase AD.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Jaungo is topical herbal agents most widely used in tradition Korean Medicine, especially used for skin dryness and allergic skin diseases. </LI> <LI> Jaungo and its three carrier oils may have the potential therapeutic effect in patients with chronic-phase AD, especially on their dry skin. </LI> <LI> This is the first study that has explored the potential therapeutic effect of Jaungo as a complementary therapy for AD. </LI> <LI> However, further large study with adjusting placebo ingredients is needed to confirm the effectiveness of Jaungo in patients with AD. </LI> </UL> </P>
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