• Biomedical Science Letters
• /
• v.11 no.1
• /
• pp.23-29
• /
• 2005

Molecular imaging with targeted contrast agents enables tissues to be distinguished by detecting specific cell-surface receptors. In the present study, a ligand-targeted acoustic nanoparticle system is used to identify angioplasty-induced expression of tissue factor by smooth muscle cell within carotid arteries. Pig carotid arteries were overstretched with balloon catheters, treated with tissue factor-targeted or a control nanoparticle system, and imaged with intravascular ultrasound before and after treatment. Tissue factor-targeted emulsion bound and increased the echogenicity and gray-scale levels of overstretched smooth muscle cell within the tunica media, versus no change in contralateral control arteries. Expression of stretch-induced tissue factor in carotid artery media was confirmed by immunohistochemistry. The potential for abnormal thrombogenicity of balloon-injured arteries, as reflected by smooth muscle expression of tissue factor, was imaged using a novel, targeted, nanoparticulate ultrasonic contrast agent.

• Clinical and Experimental Pediatrics
• /
• v.48 no.1
• /
• pp.1-5
• /
• 2005

Pediatricians often encounter some electrocardiographic abnormalities in infants and children. However, treatment or referral to pediatric cardiologist is not indicated for all arrhythmias. Many of them are benign in nature. Benign arrhythmias can be defined as the arrhythmias that no serious problem currently exists and no treatment is needed. The prognosis of benign arrhythmias is so good that the condition will never be associated with future health problem. However, some of them are benign now, but have potential for variable degrees of change to a nonbenign condition and some form of follow-up is required. For the appropriate management of electrocardiographic abnormalities, not infrequently seen in infants and children, correct diagnosis of abnormal electrocardiogram and understanding of characteristics of arrhythmias are required.

• Journal of Chest Surgery
• /
• v.11 no.1
• /
• pp.92-96
• /
• 1978

Congenital diaphragmatic eventration is a rare disease and generally accepted as an abnormally high position of part or all of the diaphragm, usually associated with a marked decrease in muscle fibers and a membranous appearance of the abnormal area. There were 4 cases of the congenital diaphragmatic eventration at the Dept. of Thoracic Surgery, Seoul National University Hospital, from 1957 to 1977. They were two boys and two girls and ranging from 1 day to 3 years of age. They were all repaired by surgical operation and one was expired postoperatively, another one was dead one year later due to complication. The ratio between right and left was 1:3 and their symptoms were cyanosis, dyspnea and frequent respiratory disease. In physical examination there was noted decreased breathing sound on the affected lung field and bowel sound was audible in some cases. Diagnosis was done by Chest X-ray and plication of the affected diaphragm was usually done in operation. There were noted atelectasis and cystic change of the affected side lung. And the liver, colon, spleen and small intestine were found in the dome of the eventrated diaphragm.

• Journal of Haehwa Medicine
• /
• v.24 no.1
• /
• pp.37-46
• /
• 2015

Objective : This study aimed to explore the clinical feature of patients with dyspepsia who were treated by an Oriental internal medicine. Methods : We analyzed 130 patients who visited an Korean Medicine Hospital for their dyspepsia-related symptoms, from March 1, 2014 until to February 28, 2015 Results : The sex composition was consisted of 31.5% man and 68.5% woman, and 85.6% of outpatient and 14.4% of inpatient. The 39.2% of patients showed chronic complain (>6 months), and the main causes included stress and fatigue for 46.2% and 31.5% respectively. The accompanied symptoms were mainly fatigue (40.0%), insomnia (36.9%), abnormal stool (34.6%), upper back pain (31.5%), and headache (28.5%). The improvement rate was 68.5% while other (31.5%) showed no change of dysplasia. Conclusion : This study created an important information of patients with dysplasia, which will be critically helpful for development of Korean Medicine-based therapeutics in the future.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2006.05b
• /
• pp.121-124
• /
• 2006

Lightweight aggregate is mainly consist of multi-crystalline structure. It may be abnormal water moving by the change of external circumstance because of its specific portion being between components and aperture. So it has some difficulty in forming without concise method about absorbing character and water-containing point even though it is used to water-containing condition over the 24 hours of absorbing amount in present. This study has main idea on the characteristics of absorption on the pressurization of lightweight aggregate.

• Proceedings of the KIEE Conference
• /
• 2001.07c
• /
• pp.1623-1625
• /
• 2001

This paper describes a monitoring program for a substation preventive diagnostic system. The monitoring program announces the condition of the transformer and GIS like normal, warning, abnormal and danger from the absolute value of data or change trend to user. The developed system is operating in 345kV U-Ryung substation for performance and environment tests.

• The KSFM Journal of Fluid Machinery
• /
• v.13 no.3
• /
• pp.12-17
• /
• 2010

The orifice establishment which is improper does to change the entity differential pressure and occurs an error in flow measurement data. Because of this, the thermal power of nuclear power plant could be evaluated excessively and the safety margin could be decreased. In this paper, characters of orifice which is established abnormally was investigated. Specially, the orifice plate which is established in opposition case was modeled and analyzed. Finally, 14.4% was lowly measured differential pressure, when being established in the resultant opposition. And this result with EPRI and NRC experiences was similar.

• Proceedings of the KSR Conference
• /
• 2007.05a
• /
• pp.922-927
• /
• 2007

The present urban maglev which has been developed in Korea is controlled by 4-edge control method over each bogie. The control output which is derived from two gap sensors and one vertical acceleration sensor controls magnet to maintain a nominal gap. But, the gap signal acts as a big disturbance in rail joint though two gap sensors are used and finally result in unstable response and poor ride comfort. This paper treats of a method to compensate the gap signal in rail joint for the levitation control of urban maglev. The physically abnormal change of gap is detected when one gap sensor passes a rail joint, the disturbance of gap in rail joint is estimated. Finally the disturbance in gap signal is eliminated by processing the information of vehicle speed and estimated disturbance in when the other gap sensor passes a rail joint.

• Journal of the Korean Society for Precision Engineering
• /
• v.17 no.5
• /
• pp.70-75
• /
• 2000

After the patterning and probe process of wafer have been achieved, the dicing process is necessary to separate chips from a wafer. The dicing process cuts a wafer to lengthwise and crosswise direction to make many chips by using narrow circular rotating diamond blade. But inferior goods are made under the influence of complex dicing environment such as blade, wafer, cutting water and cutting conditions. This paper describes a monitoring algorithm using feature extraction in order to find out an instant of vibration signal change when bad dicing appears. The algorithm is composed of two steps: feature extraction and decision. In the feature extraction, two features processed from vibration signal which is acquired by accelerometer attached on blade head are proposed. In the decision. a threshold method is adopted to classify the dicing process into normal and abnormal dicing. Experiment have been performed for GaAs semiconductor wafer. Based upon observation of the experimental results, the proposed scheme shown a good accuracy of classification performance by which the inferior goods decreased from 35.2% to 12.8%.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 1999.08a
• /
• pp.423-428
• /
• 1999

A high precision hot strip width control method has been developed in this study by applying interstand looper tension measuring system at finishing mill stands. As with deviation of hot rolled steel strip is closely related to abnormal increase in the interstand strip tension, on-line measuring device of looped tension and data analyzing system was developed in this study. To determine dominant factors that will cause local width shortage, the logged data sets of bar width, bar thickness, looper tension, and strip thickness along the strip length were correlated with the data set of strip width change. With the result of the correlation analysis, existing sequence control logic and parameters for looper actuator were modified for strip width quality and the gains of the looper control were refined for the stable operation during the full passage of rolled strip. The on-line tension measurement and tension feedback control for looper system improved strip travelling stability and reduced strip width deviation in the srip top end region.