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심한섭,이치우,김남경,안국찬,남궁재관 한국공작기계학회 2005 한국공작기계학회 춘계학술대회논문집 Vol.2005 No.-
Dynamic flow characteristics of a solenoid valve are affected by pressure difference in inlet and outlet of orifice, gas temperature, and supply voltage of a coil. In this paper, the dynamic flow characteristics for deviations of various conditions are studied Static and dynamic flow for variation on-time of a solenoid valve open signal are measured in basic bench test. The solenoid valve is applied to a compressed natural gas(CNG) engine test for validation of flow control performance. The experimental results show that flow of high pressure gas can controlled precisely by using a solenoid valve.
Critical Role of Crystal Water for a Layered Cathode Material in Sodium Ion Batteries
Nam, Kwan Woo,Kim, Sangryun,Yang, Eunjeong,Jung, Yousung,Levi, Elena,Aurbach, Doron,Choi, Jang Wook American Chemical Society 2015 Chemistry of materials Vol.27 No.10
<P>Layered transition metal oxides are considered promising cathodes for sodium ion batteries (SIBs) due to their superior specific capacities. However, they usually suffer from insufficient cycling and rate performance mainly from the structural instability during repeated cycles. We overcome these longstanding challenges by engaging crystal water in the interlayer space of sodium manganese oxide under the Birnessite framework. The crystal water enhances Na ion diffusion both in the crystal host and at the interface, suppresses fatal Mn<SUP>2+</SUP> dissolution, and improves long-term structural stability, leading to excellent performance in rate capability and cycle life. The current study suggests that many hydrated materials can be good candidates for electrode materials of emerging rechargeable batteries that need to deal with the large size or multivalent charge of their carrier ions.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-10/acs.chemmater.5b00869/production/images/medium/cm-2015-00869q_0003.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm5b00869'>ACS Electronic Supporting Info</A></P>
내압검사에서 정상 또는 비효과적 식도운동 소견을 보였던 식도이완불능증 2예
남관우 ( Kwan Woo Nam ),조유경 ( Yu Kyung Cho ),백창렬 ( Chang Nyol Paik ),오순남 ( Soon Nam Oh ),장재혁 ( Jae Hyuck Chang ),박재명 ( Jae Myung Park ),이인석 ( In Seok Lee ),김상우 ( Sang Woo Kim ),최명규 ( Myung Gyu Choi ),정인식 대한소화기기능성질환·운동학회 2008 Journal of Neurogastroenterology and Motility (JNM Vol.14 No.1
Esophageal impedance manometry provides the information about esophageal contraction and bolus transit. Barium esophagogram provides the structural and functional information in patients with dysphagia. Typical features of achalasia are aperistalsis of esophageal body and incomplete relaxation of lower esophageal sphincter. The radiologic diagnosis of achalasia is made easily in most patients because it usually shows typical radiologic findings, such as esophageal dilatation and tapering of distal esophagus. We report the two patients with dysphagia who had a discrepancy between manometric diagnoses and radiologic diagnosis. Their manometric diagnoses were normal and ineffective esophageal motility respectively, whereas their simultaneous esophageal impedance manometry and barium esophagogram revealed typical features of achalasia.
남관우 ( Kwan Woo Nam ),백명기 ( Myong Ki Baeg ),권정현 ( Jung Hyun Kwon ),조성훈 ( Soung Hoon Cho ),나수진 ( Soo Jin Na ),최명규 ( Myung Gyu Choi ) 대한소화기학회 2013 대한소화기학회지 Vol.61 No.5
tissue lymphoma. This study was to determine whether H. pylori was associated with colorectal neoplasms in Korean subjects undergoing routine checkup. Methods: A total of 10,082 subjects underwent routine checkups from January 2004 to April 2005. A H. pylori IgG test and stool occult blood test were included in the routine checkup program. Colonoscopy was performed if the stool occult blood test was positive or under subject request. Patients who underwent colonoscopy and had histologically confirmed cases of colorectal neoplasms were designanted as the subject group and those without as the control group. Results: Of the 10,082 subjects, 597 had full colonoscopy. The results identified 9 colorectal carcinomas and 118 adenomas. H. pylori seropositivity was identified in 6 (66%) subjects with colorectal carcinoma, 81 (68.6%) with colorectal adenoma and 248 (52.8%) controls. Subjects having colorectal neoplasms had a significantly higher H. pylori seropositivity rate compared with the controls (OR 1.94, 95% CI 1.28-2.95). This remained significant after adjusting for age, sex, body mass index, HbA1c and total cholesterol (OR 1.90, 95% CI 1.23-2.93). Patients with distal neoplasms also had a significantly higher H. pylori seroposivity rate (OR 1.88, 95% CI 1.17-3.01) which persisted after multivariate adjustment (OR 1.79, 95% CI 1.10-2.94). Conclusions: Subjects with colorectal neoplasms present an increased H. pylori seroprevalence compared with controls. (Korean J Gastroenterol 2013;61:259-264)
Jung, Woo Sang,Hong, Jin-woo,Lee, Jun-woo,Park, Seong-uk,Moon, Sang-kwan,Ko, Chang-nam,Cho, Ki-ho,Kim, Young-suk,Bae, Hyung-sup 경희대학교 동서의학연구소 2006 東西醫學硏究所 論文集 Vol.2006 No.-
Objectives : With an assumption of traditional oriental medical theory, to evaluate the effect of tonification/sedation manipulative acupuncture on blood pressure in male normotensives. Methods : This study. AS a randomized cross-over trial. We enrolled healthy male normotensive subjects, and assigned them randomly to group A or group B. Group A received acupuncture therapy Aon Shen-Men(He-7) and Nei-Kuan(EH-6) with tonification-manipulation, while group B received it with sedation-Manipulation. Blood pressure was assessed every ten minutes for 2 hours. After 3 days of washout period, the subjects were crossed over to the other manipulation, and the same procedures were performed. Results : We observed that blood pressure stimulated by the sedation-manipulation had a tendency to decrease compared to that by the tornification-manipulation. Conclusion : We suggest the sedation manipulation has more synergic effect with the inhibitory effects of Shen-Men and Nei-Kuan On the sympathetic nervous system than the tornification-manipulation.
Hong, Jin-Woo,Lee, Jun-Woo,Park, Seong-Uk,Moon, Sang-Kwan,Ko, Chang-Nam,Cho, Ki-Ho,Kim, Young-Suk,Bae, Hyung-Sup,Jung, Woo-Sang The Society of Korean Medicine 2006 대한한의학회지 Vol.27 No.4
Objectives : With an assumption of traditional oriental medical theory, to evaluate the effect of tonification/sedation manipulative acupuncture on blood pressure in male normotensives. Methods : This study was a randomized cross-over trial. We enrolled healthy male normotensive subjects, and assigned them randomly to group A or group B. Group A received acupuncture therapy on Shen-Men (He-7) and Nei-Kuan (EH-6) with tonification-manipulation, while group B received it with sedation-manipulation. Blood pressure was assessed every ten minutes for 2 hours. After 3 days of washout period, the subjects were crossed over to the other manipulation, and the same procedures were performed. Results : We observed that blood pressure stimulated by the sedation-manipulation had a tendency to decrease compared to that by the tonification-manipulation. Conclusions : We suggest the sedation manipulation has more synergic effect with the inhibitory effects of Shen-Men and Nei-Kuan on the sympathetic nervous system than the tonification-manipulation.