Search

Your search keyword '"Ji, Sang-Won"' showing total 84 results
Start Over Author "Ji, Sang-Won"
84 results on '"Ji, Sang-Won"'

4. A Study on the AC Power Control Using PIC Microcontroller

Author

Ji, Sang Won, Han, Seung Hun, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Cortes Tobar, Dario Fernando, editor, Hoang Duy, Vo, editor, and Trong Dao, Tran, editor

Published
2021
Full Text
View/download PDF

44. Pyloric Brunner's gland hamartoma

Author

Jeong, Yon Soo, primary, Chung, Jun Pyo, additional, Lee, Dok Yong, additional, Ji, Sang Won, additional, Lee, Se Joon, additional, Lee, Kwan Sik, additional, Lee, Sang In, additional, and Park, Chanil, additional

Published
2004
Full Text
View/download PDF

45. Nonlinear observer and sliding mode control design for dynamic positioning of a surface vessel.

Author

Bui, Van Phuoc, Ji, Sang Won, Choi, Kwang Hwan, and Kim, Young Bok

Abstract

In this paper, dynamic positioning of large surface vessel in harbor area using multiple autonomous tugboats is investigated. There are two objectives in this paper. First, a nonlinear observer is applied to estimate low frequency position and velocity of ship from noisy measurements. Furthermore, the nonlinear observer is also used to estimate the bias states of slow frequency disturbances due to wind, wave and current and filter out the wave frequency components. Second, sliding mode controller for slow speed trajectory tracking is proposed. The resulting sliding mode control law guarantees desirable performance of ship considered in environmental disturbances. The proposed approach has been simulated with a supply vessel model and found to work well. [ABSTRACT FROM PUBLISHER]

Published
2012

47. The H∞ controller design including control allocation for marine vessel.

Author

Ji, Sang-Won, Jang, Ji-Seong, Jeong, Ji-Hyun, and Kim, Young-Bok

Abstract

In this study, propose a new approach to mooring control problem of the marine vessels by actuators. The actuators are installed in the vessel to be positioned in the specified area. There are many types of actuator system in the real applications. The useful and widely applicable systems are thruster and mooring winch system. If we consider this problem in point of usefulness including cost, we can easily find out that the mooring winch system is more useful and popular to the real field than the thrust system except the special object. In this case, a complicate fact is the control allocation. For this problem, many results have been given and verified by other researchers with a process followed from two individual steps. It means that the controller and control allocation design process is carried out individually. In this paper, give more sophisticated design solution for this issue. The authors propose a new design method in which the controller design and control allocation problem is considered simultaneously. In other word, the system stability, control performance and allocation problem are unified by a LMI(linear matrix inequality) based on H∞ control theory. [ABSTRACT FROM PUBLISHER]

Published
2012

48. [The development of irritable bowel syndrome after Shigella infection: 3 year follow-up study].

Author

Kim HS, Kim MS, Ji SW, and Park H

Subjects
Adult, Female, Follow-Up Studies, Humans, Male, Dysentery, Bacillary complications, Irritable Bowel Syndrome etiology
Abstract

Background/aims: Bacterial gastroenteritis seems to be a risk factor of irritable bowel syndrome (IBS). The incidence of post-infectious IBS (PI-IBS) was reported to be in the range of 7-31%, but few studies have reported long term follow-up results. So, we investigated the clinical course and prognosis of PI-IBS three years after shigella infection., Methods: The subjects were recruited from our previous study, in which we investigated the incidence and risk factors of PI-IBS. We had a questionnaire based on interview with 120 controls and 124 patients who had shigella infection three years ago. Both groups were evaluated for the presence of IBS, functional bowel disorders (FBD) except IBS before, one and three years after the infection, respectively., Results: Ninety-five patients (76.6%) and 105 controls (87.5%) completed the questionnaire. In patients group, 7 cases had IBS prior to infection (previous IBS), 12 cases (13.8%) had IBS after 1 year (PI-IBS). Four cases developed IBS newly after 3 years (new IBS). Thirteen cases (14.9%) in patients and 4 cases (4.5%) in controls had IBS over 3 years (OR 3.93: 1.20-12.86). The recovery rate over 3 years were 50.0% (2/4) in previous IBS and 25% (3/12) in PI-IBS. The incidence of PI-IBS after 3 years in previous FBD subjects was 28.6% and was 10.6% in normals (p<0.05). The female gender was a risk factor for FBD., Conclusions: Bacterial gastroenteritis is a trigger factor of IBS. About a quarter of PI-IBS patients are recovered over 3 years. Previous FBD except IBS is a risk factor after 3 years.

Published
2006

49. [Altered colonic transit in TNBS-induced experimental colitis in guinea pig and distribution of nitric oxide synthase in the colonic wall].

Author

Cho SH, Park H, Chung JP, Lee YH, Ji SW, No TW, and Lee SI

Subjects
Animals, Colitis chemically induced, Colitis enzymology, Colon innervation, Guinea Pigs, Male, Trinitrobenzenesulfonic Acid, Colitis physiopathology, Colon enzymology, Gastrointestinal Transit, Myenteric Plexus enzymology, Nitric Oxide Synthase metabolism
Abstract

Background/aims: Inflammation-induced alterations in smooth muscle contractility may be due to the effects on smooth muscle itself, neurotransmitters or enteric nerves. In dextran sulfate sodium-induced colitic rat, the delay in colonic transit was caused by decreased activity and production of neuronal nitric oxide synthase (nNOS) in the myenteric plexus of the distal colon. The aim of this study was to investigate the relationship between the delay in colonic transit and the distribution of inducible NOS (iNOS) and nNOS immunoreactive cells in the myenteric plexus of trinitrobenzene sulfonic acid (TNBS)-induced colitic guinea pig., Methods: Sacrificed and their colonic tissues of forty-five TNBS-induced colitic guinea pigs were used to measure the colonic transit, and analyzed by immunohistochemistry., Results: Colonic transit was delayed significantly at 3, 7 and 14 days after administration of TNBS. In control, nNOS immunoreactivity was present in the mucosa, submucosa, lamina propria, and ganglion cells of the myenteric plexus, while after TNBS treatment, reduced nNOS cells were found. However, the number of nNOS ganglion cells in the myenteric plexus was similar to those seen in controls. After administration of TNBS, iNOS immunoreactivity was increased in the mucosa and submucosa, but the number of iNOS positive ganglion cells in the myenteric plexus was not changed compared to control., Conclusions: It is suggested that in TNBS-induced guinea pig colitis, delayed colonic transit is not associated with the expression of nNOS nor iNOS in the myenteric plexus.

Published
2004

50. [Usefulness of urinary trypsinogen-2 dipstick test for diagnosis of acute pancreatitis].

Author

Hwang SJ, Chung JP, Kim YG, Song DH, Lee JS, Baek SS, Kim DY, Lee DY, Jeong YS, Ji SW, Lee SJ, Song SY, Lee KS, Chung JB, Lee SI, Kang JK, Park JS, and Cho KH

Subjects
Acute Disease, Adult, Aged, Biomarkers analysis, Female, Humans, Lipase blood, Male, Middle Aged, Reagent Strips, Sensitivity and Specificity, Pancreatitis diagnosis, Trypsinogen urine
Abstract

Background/aims: The clinical usefulness of urinary trypsinogen-2 dipstick test is still in controversy. We evaluated the usefulness of urinary trypsinogen-2 dipstick test in patients with acute pancreatitis., Methods: Urinary trypsinogen-2 dipstick test was prospectively performed in 50 patients with acute pancreatitis, 50 patients with non-pancreatic abdominal pain, and 50 healthy controls., Results: On admission, urinary trypsinogen-2 dipstick test was positive in 36 of 50 patients with acute pancreatitis (sensitivity, 72%) and in 4 of 50 patients with non-pancreatic abdominal pain (specificity, 92%). On the other hand, it was all negative in controls. The sensitivity and specificity of serum lipase were 78% and 94%, respectively. At 24 hours after admission, the positive rate of urinary trypsinogen-2 dipstick test rose from 72% to 94% (p=0.02). The results of urinary trypsinogen-2 dipstick test was positive in 14 of 15 patients with severe pancreatitis and 22 of 35 patients with mild pancreatitis according to the criteria by Atlanta International Symposium, 1992., Conclusions: Urinary trypsinogen-2 dipstick test is comparable to serum lipase in diagnosing acute pancreatitis. Delayed measurement and severe pancreatitis are more likely to yield positive results with urinary trypsinogen-2 dipstick test. Thus, we suggest that the cut-off value of urinary trypsinogen-2 dipstick test should be lowered to increase its sensitivity.

Published
2004

Catalog

Books, media, physical & digital resources
See catalog results