제주도 서귀포시지역의 용도지역별 하수발생량 특성에 관한 연구

정광옥,류성필 한국환경과학회 2004 한국환경과학회지 Vol.13 No.3

To identify the characteristics of wastewater flow generated in treatment basins of Seogwipo-city, we selected 3 stations representing the basin and performed 7 times of field survey including 5 times in dry periods and 2 times in wet periods from Feb. 25 to May 27, 2002 for the selected stations. From the analysis of flow data measured for more than 60 days in the interval of 5 minutes and concentration data obtained from laboratory analysis, we can draw several conclusions. First, in the analysis of diurnal variation of wastewater flow for land-use types, we could find the following results: in the residential area, it is observed that wastewater flow rates rise early in the morning for the office-going hour and fall gradually and rise again after the office-leaving hour, showing typical residential wastewater flow pattern, while for the residential and commercial area flow rates rise early in the morning at the office-going hour and move up and down repeatedly within wide range and last till the office-leaving hour, which can be resulted from wastewater that is generated by tourists activated after early in the afternoon, while for the touristy area flow rates rise early in the morning and fall gradually and rise again within wide range. Second, in the analysis of temporal variation of wastewater flow for monthly, it can be observed that in the residential area, in the residential and commercial areas the flow rate of May is higher than that of Feb., March, while for the touristy area flow rate is without monthly because it reflects the movement of population, Third, in wet periods concentration of water-quality item such as SS, BOD, and COD_(cr) is high in the beginning of rainfall by first flush, and falls down gradually to reach the steady state, which is the level of wastewater in dry periods after the cease of storm water due to diluting effect resulting from additional runoff water through storm sewers.

GO에 의해 유도된 培養 脊髓感覺神經細胞 독성에 대한 鎭肝熄風湯의 방어효과

박광수,이호승,김인수,강길성,김인규,김인섭,류도곤 한국전통의학연구소 2003 한국전통의학지 Vol.13 No.1

To evaluate the effect of Jingansikpungtang water extract on cultured mouse spinal sensory neuron which was inhibited by glucose oxidase(GO)-induced cytotoxicity, NR assay and TBARS assay for lipid peroxidation were carried out after the cultured mouse spinal sensory neuron were pre-incubated with various concentrations of Jingansikpungtang water extract for 3 hours prior to exposure of GO. GO, a oxygen radical, decreased the survival rate of the cultured mouse spinal sensory neuron cells on NR assay. Jingansikpungtang water extract have efficacy of decreasing lipid peroxidation increasing by GO in cultured mouse spinal sensory neuron. From above the results, it is concluded that Jingansikpungtang has marked efficacy as a treatment for the damages caused in the GO-mediated oxidative process.

장애인 및 노약자를 위한 생활관련 시설의 연계방향

강병근,성기창,박광재,윤영삼,김상운,정현정,류상오 한국의료복지시설학회 2009 의료·복지 건축 Vol.15 No.1

This study aims to plan connecting living facilities considering on the Barrier Free Walking of the disabled and the elderly in the residential area. We had found several physical problems on the peestrian's way that becomes the major factor of disturbing the barrier free movement for using living facilities in the local area by investigations and enquetes. We had suggested the arrangement method for these physical problems on the pedestrian's way and building the ideal area for living facilities by the disposition stages with the result of investigations and enquetes. After these process, we had planned connecting living facilities considering on the Barrier Free WaIking of the disabled and the elderly in the residential area.

난소절제후 Estrogen을 투여한 흰쥐 대동맥에서 Protein Kinase C-α와 Fas 발현의 변화

이왕수,이상엽,안지현,송영빈,김학진,이광재,유재격,김상욱,김태호,김치정,류왕성 중앙대학교 의과대학 의과학연구소 2001 中央醫大誌 Vol.26 No.3

Estrogen is believed to decrease coronary artery disease. Protein kinase C-α(PKCα)appear to be important in signal conduction pathways. Estrogen treatment increases catalytic activity of PKCα,and activation of PKCαcan modulate estrogen receptor levels and responsiveness. And it was reported that activation of PKC can protect cells from apoptosis induced by Fas ligation. But the beneficial effect of estrogen on PKCαwas not clearly demonstrated. The objective of this study was to evaluate the role of PKCαafter ovariectomy and estrogen therapy in rat aorta. The results were summarized as below: 1. The significant pathological changes were not observed in the rat aorta irrelevant to ovariectomy and estrogen therapy. 2. The expression of Fas was decreased in the aorta of estrogen-treated rats than that of ovariectomized rats without estrogen therapy. 3. Increased expression of PKCαwas more marked in the aprta of estrogen-treated rats than that of ovariectomized rat without estrogen therapy. In conclusion,PKCαmay be important in signal conduation pathway on the effect of estrogen. Activation of PKCαby estrogen reduced Fas expression, suggesting that PKCαactivation may play a role in protection against atherasclerosis. Further studies are needed to elucidate the role of PKCαafter estrogen therapy.

Size and Morphology Controlled Lithium Manganese Oxide on Silica Sphere with Core–Shell Structure

Ryu, Seong-Hyeon,Ju, Jeong-Hun,Cho, Sung-Woo,Ryu, Kwang-Sun American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.2

Synthesis and Electrochemical Characterization of Silica-Manganese Oxide with a Core-shell Structure and Various Oxidation States

Ryu, Seong-Hyeon,Hwang, Seung-Gi,Yun, Su-Ryeon,Cho, Kwon-Koo,Kim, Ki-Won,Ryu, Kwang-Sun Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.8

Silica-manganese oxides with a core-shell structure were synthesized via precipitation of manganese oxides on the $SiO_2$ core while varying the concentration of a precipitation agent. Elemental analysis, crystalline property investigation, and morphology observations using low- and high-resolution electron microscopes were applied to the synthesized silica-manganese oxides with the core-shell structure. As the concentration of the precipitating agent increased, the manganese oxide shells around the $SiO_2$ core sequentially appeared as $Mn_3O_4$ particles, $Mn_2O_3+Mn_3O_4$ thin layers, and ${\alpha}-MnO_2$ urchin-like phases. The prepared samples were assembled as electrodes in a supercapacitor with 0.1 M $Na_2SO_4$ electrolyte, and their electrochemical properties were examined using cyclic voltammetry and charge-discharge cycling. The maximum specific capacitance obtained was 197 F $g^{-1}$ for the $SiO_2-MnO_2$ electrode due to the higher electronic conductivity of the $MnO_2$ shell compared to those of the $Mn_2O_3$ and $Mn_3O_4$ phases.

Treatment Outcome for Gastric Mucosa-Associated Lymphoid Tissue Lymphoma according to Helicobacter pylori Infection Status: A Single-Center Experience

( Kwang Duck Ryu ),( Gwang Ha Kim ),( Seong Oh Park ),( Kwang Jae Lee ),( Jung Youn Moon ),( Hye Kyung Jeon ),( Dong Hoon Baek ),( Bong Eun Lee ),( Geun Am Song ) 대한소화기학회 2014 Gut and Liver Vol.8 No.4

Background/Aims: Helicobacter pylori eradication therapy has been used as a first-line treatment for H. pylori-positive gastric mucosa-associated lymphoid tissue (MALT) lymphoma. However, the management strategy for H. pylori-negative MALT lymphoma remains controversial. Therefore, the aim of this study was to examine the success rate of each treatment option for H. pylori-positive and H. pylori-negative gastric MALT lymphomas. Methods: In total, 57 patients with gastric MALT lymphoma diagnosed between December 2000 and June 2012 were enrolled in the study. The treatment responses were compared between H. pylori-positive and H. pylori-negative gastric MALT lymphomas. Results: Of the 57 patients, 43 (75%) had H. pylori infection. Forty-eight patients received H. pylori eradication as a first-line treatment, and complete remission was achieved in 31 of the 39 patients (80%) with H. pylori-positive MALT lymphoma and in five (56%) of the nine patients with H. pylori-negative MALT lymphoma; no significant difference was observed between the groups (p=0.135). The other treatment modalities, including radiation therapy, chemotherapy, and surgery, were effective irrespective of H. pylori infection status, with no significant difference in the treatment response between H. pylori-positive and H. pylori-negative MALT lymphomas. Conclusions: H. pylori eradication therapy may be considered as a first-line treatment regardless of H. pylori infection status. (Gut Liver 2014;8:408-414)

GIS기반의 도시지역 불투수면 관리를 위한 최적 투수/불투수도 제작 방법에 관한 연구

오성광 ( Seong Kwang Oh ),김계현 ( Kye Hyun Kim ),이철용 ( Chol Young Lee ),유광현 ( Kwang Hyun Ryu ) 한국물환경학회 2015 한국물환경학회지 Vol.31 No.2

Due to increasing impervious surfaces resulting from urbanization and industrialization which are directly linked to urban inundation and non-point pollutants runoff, there is a need to manage them systematically. A management over urban impervious surfaces calls for pervious/impervious maps, which enable viewing the distribution of impervious surfaces. Nevertheless, relevant data are absent as now. In this respect, despite the diversity of proposed methods, pilot implementation and accuracy verification have never been conducted. Therefore, this study is aimed to produce a pilot pervious/impervious map based on previously proposed methods and to elucidate its pros and cons with a view to proposing a method for producing a GIS-based optimal pervious/impervious map. Following previously proposed methods, a pervious/impervious map of Bupyeong-gu, Incheon was produced. Then, a method of producing optimal pervious/impervious maps applicable to urban areas was proposed through the comparison of pros and cons of relevant spatial data. As a result, the map had been confirmed 99.2% of classification accuracy. Based on the present findings, future studies should establish a standardized method for producing. Also, this method should be used to produce pervious/impervious maps of other regions so that it can be applied to managing impervious surfaces in major urban areas nationwide.

Single Oral Dose Toxicity Test of Water Extracts of Puerariae Radix in ICR Mice

Seong, Seung-Kyoo,Kim, Dae-Yong,Rhee, Jung-Woo,Leem, Moon-Jeong,Rho, Yang-Kook,Lee, Hyun-Yong,Ryu, Jei-Man,Ku, Sae-Kwang Korean Society of ToxicologyKorea Environmental Mu 2006 Toxicological Research Vol.22 No.4

The object of this study was to obtain acute toxicity information (single oral dose toxicity) of lyophilized water extract of Puerariae Radix (PR) in both male and female mice. In order to investigate the 50% lethal dose $(LD_{50})$, approximate lethal dosage (ALD), test substances were once orally administered to female and male ICR mice at dose levels of 2000 and 0 (control) mg/kg (body wt.) according to the recommendation of KFDA Guidelines [2005-60, 2005]. The mortality and body weight changes, clinical signs and gross observation were monitored during 14 days after dosing. Organ weight and histopathology of 12 principal organs were measured. As the results, we could not find any mortality, clinical signs, body weight changes and gross findings except for PR extracts unrelated sporadic findings. In addition, no abnormal changes related PR extracts treatment on the organ weight and histopathology of principal organs were detected except for some sporadic findings including hyperplasia of lymphoid follicles in the popliteal lymph nodes and spleen as pharmacological effects of PR extracts. The results obtained in this study suggest that the PR extracts does not cause any toxicological signs except for pharmacological effects of enhancement of Immune system. The $LD_{50}$ and ALD of PR extracts in both female and male mice were considered as over 2000 mg/kg because no mortalities were detected up to 2000mg/kg that was the highest dose recommended by KFDA and Organization for Economic Co-Operation and Development.

High-performance diketopyrrolopyrrole-based organic field-effect transistors for flexible gas sensors

Ryu, Gi-Seong,Park, Kwang Hun,Park, Won-Tae,Kim, Yun-Hi,Noh, Yong-Young Elsevier 2015 Organic Electronics Vol.23 No.-

<P><B>Abstract</B></P> <P>We demonstrate high-performance flexible polymer OFETs with P-29-DPP-SVS in various geometries. The mobilities of TG/BC OFETs are approximately 3.48±0.93cm<SUP>2</SUP>/Vs on a glass substrate and 2.98±0.19cm<SUP>2</SUP>/Vs on a PEN substrate. The flexible P-29-DPP-SVS OFETs exhibit excellent ambient and mechanical stabilities under a continuous bending stress of 1200 times at an <I>R</I> =8.3mm. In particular, the variation of <I>μ</I> <SUB>FET</SUB>, <I>V</I> <SUB>Th</SUB> and leakage current was very negligible (below 10%) after continuous bending stress. The BG/TC P-29-DPP-SVS OFETs on a PEN substrate applies to flexible NH<SUB>3</SUB> gas sensors. As the concentration of NH<SUB>3</SUB> increased, the channel resistance of P-29-DPP-SVS OFETs increased approximately 100 times from ∼10<SUP>7</SUP> to ∼10<SUP>9</SUP> Ω at <I>V</I> <SUB>SD</SUB> =−5V and <I>V</I> <SUB>GS</SUB> =−5V.</P> <P><B>Highlights</B></P> <P> <UL> <LI> DPP-based OFETs are fabricated on a PEN substrate for flexible gas sensor applications. </LI> <LI> Flexible P-29-DPP-SVS OFETs show an impressive mobility of 2.98±0.19cm<SUP>2</SUP>/Vs. </LI> <LI> Reliable NH<SUB>3</SUB> gas sensing is observed with high ambient and bending stabilities. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>