• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.9
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• pp.3406-3411
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• 2010

Assessment of the accommodative response is an essential part of the optometric examination. This study measured objectively the accommodation responses those were measured by Autorefractor, MEM retinoscopy and Nott dynamic retinoscopy, and investigate the correlation and difference the results. Twenty-seven college students with normal visual acuity aged 19 to 29 years (mean $22.7{\pm}2.43$ years) participated in this study. Their accommodative responses to accommodative demand of 4D (25cm) were measured with Shin-Nippon NVision-K 5001 Autorefractor, MEM retinoscopy and Nott dynamic retinoscopy. The accommodative responses to accommodative demand of 4D were $3.70{\pm}0.25D$ by Shin-Nippon NVision-K 5001 Autorefractor, $3.58{\pm}0.30D$ by MEM retinoscopy and $3.77{\pm}0.29D$ by Nott dynamic retinoscopy, respectively. There were high correlations among the three techniques (p<0.05). MEM retinoscopy was measured $0.19{\pm}0.13D$ lower than Nott dynamic retinoscopy (p<0.05) and it was measured $0.12{\pm}0.24D$ lower than Shin-Nippon NVision-K 5001 Autorefractor (p<0.05). There was no significant difference between Nott dynamic retinoscopy and Shin-Nippon NVision-K 5001 Autorefractor (p>0.05). MEM retinoscopy showed lesser accommodative responses than Nott dynamic retinoscopy and Shin-Nippon NVision-K 5001 Autorefractor. Author suggest that Nott dynamic retinoscopy may use Shin-Nippon NVision-K 5001 Autorefractor interchangeably to evaluate accommodative responses expect MEM retinoscopy.

• Journal of Preventive Medicine and Public Health
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• v.30 no.3 s.58
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• pp.623-629
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• 1997

This is cross-sectional study to evaluate a potential relationship between air conduction hearing threshold and blood viscosity in normal adult males(n=1677). We measured hearing threshold in frequency level at 500, 1000, 2000, 4000Hz by pure-tone audiometry and RBC profiles containing red cell number, hemoglobin, hematocrit. Blood viscosity are replaced by hematocrit that are one major factor of influencing blood viscosity. PTAs(pure-tone averages) are measured by hearing threshold averages level at 500Hz, 1000Hz, 2000Hz. Grades of PTAs(pure-tone averages) are divided three groups that are less then 10.0dB group, between 10.0-19.9dB group and excess 20.0dB. The results shows significant association among hematocrit, red cell number and hearing loss(age adjust by ANACOVA).

• Journal of the Korean Society of Radiology
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• v.12 no.4
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• pp.491-496
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• 2018

The purpose of this study is to analyze the noise spectra in DWI (diffusion-weighted imaging) pulse sequences of 1.5 Tesla and 3.0 Tesla MRI, The ACR (American College of Radiology) phantom and noise spectrum were analyzed by FFT (fast Fourier transform) and TFFT (temporal frequency analysis) using WavePad sound editor version 8.13 (NCH software, Greenwood Village, CO, USA). Noise spectra, FFT and TFFT were analyzed for laboratory 1.5Tesla and 3.0Tesla DWI MR pulse sequences. The noise threshold of the frequency amplitude in the FFT and TFFT at 3.0Tesla compared to 1.5Tesla was between 1.5Tesla and -6 dB, and between 3.0Tesla and 0 dB, the DWI pulse sequence for the patient's noise reduction was appropriately MR examination needs to be applied.

• Journal of the Korean Society of Radiology
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• v.2 no.1
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• pp.17-21
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• 2008

Because of the reason that the meningioma is enhanced lately, we started the study to maximally enhance the meningioma. we were to know the relation between meningioma and vessels in the skull and compared 3D CT angiography with the conventional angiography. we got the data from 6 patients performed by both 3D CT angiography and there were 5 cases in sphenoidal ridge and 1 case parasagittal sinus. Injecting the contrast media at 3 ml/sec, 120 ml and then the CT number reached 100, we started the study using the medical system Program(smart prep). The scan parameters were HS-Mode(1.25 mm / 7.5 mm) right after being injected all and reconstructed with 0.5 mm interval. We compared the study with the conventional angiography after reconstructing the images required by using 3D-Med software Program(Rapidia). Seeing the consequences, the maximum enhancing time in the menigioma is about 120~180 seconds after injecting the contrast media and we distinguished the relation between vessels and tumors at the time and 1 case showed us the aneurysm with a tumor clearly at the time too. It was very helpful to the operation that the 3D images required by injecting the contrast media to the patients with meningioma distingushed between tumors and vessels dimensionally.

• Journal of Korea Multimedia Society
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• v.10 no.4
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• pp.527-536
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• 2007

This paper proposes a 3D fashion design system that generates a 3D clothes model by using 2D patterns of clothes and drapes the 3D clothes model on a 3D human model. In the proposed system, 2D patterns of clothes are designed by selecting comer points of 2D mesh. After designing 2D patterns, a 3D clothes model is designed by describing the control points to be connected between 2D patterns. The proposed system reads a 3D human body model file and the designed 3D clothes model and creates a 3D human model putting on the clothes by using the mass-spring model based physical simulation. It calculates collision and reaction between the triangles of human body model and those of clothes for realistic simulation. Because the number of triangles is very large, the collision and reaction processing need a lot of time. To solve this problem, the proposed system decreases the number of collision and reaction processing by using the Octree space subdivision technique. It took a few seconds for generating a 3D human model putting on the designed 3D clothes.

• Journal of Korean Ophthalmic Optics Society
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• v.7 no.2
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• pp.61-65
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• 2002

This study examines how the average presbyopic additions and eye refraction state of old ages in city may be different to that island. There were 677 of the old who were 50 or over 90 in the sample. The visual acuity test was done by objective and subjective methods and used for near-chart program. The far-point refraction state and power of the additions lens results were as follows ; 1. Of far-point refraction state in city peoples; male: emmetropia 10%, myopia 17%, hyperopia 19%, mixed astigmatism 38%, etc. 16% female : emmetropia 20%, myopia 20%, hyperopia 20%, mixed astigmatism 27%, etc. 13% 2. Of far-point refraction state in island villages ; male : emmetropia 13%, myopia 17%, hyperopia 22%, mixed astigmatism 40%, etc. 8% female : emmetropia 7%, myopia 13%, hyperopia 26%, mixed astigmatism 44%, etc. 10% 3. Average presbyopic additions states has been presented no discrimination ; male: 50 to 60 : +1.25 or +1.50D, 61 to 65 : +1.75 or + 2.00D, 66 to 70 : +2.25 or +2.50D 71 to 75 : +2.75 or +3.00D, 76 to 80 : +3.25 or +3.50D, over81 : +3.75D female : 50 to 60 : +1.25 or + 1.50D, 61 to 65 : +1.75 or + 2.00D, 66 to 70 : +2.25 or +2.50D 71 to 75 : +2.25 or + 2.50D, 76 to 80 : +2.75 or +3.00D, over81 : +2.75 or +3.00D 4. Under the condition of wearing lens, the average working time was 1 or 2 hour but some people used over 5 hours. 5. Generally, it has been investigated the old ages peoples has ocular diseases and cataract was the most common.

• Journal of Chest Surgery
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• v.37 no.9
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• pp.781-786
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• 2004

None of the currently available strategies for diagnosis and management of the pleural effusion are ideal. We tried to evaluate the validity of VEGF in differential diagnosis of the pleural effusion and find out if VEGF were correlated with the established markers. Material and Method: 35 patients with pleural effusion were divided into malignant effusion (n=10), benign effusion (n=5), infectious effusion (n=10), and pneumothorax (n=10), respectively. The pleural fluids from each group were examined for differential cell count, chemistry (glucose, protein, LDH, and ADA), and VEGF. Result: Glucose level was lower in infectious effusion compared with benign effusion (60.5$\pm$36.09 mg/dL vs. 162.0$\pm$19.80 mg/dL, p=0.011). ADA level in infectious effusion was higher compared with malignant effusion (87.9$\pm$42.62 IU/L vs. 27.7$\pm$31.04 IU/L, p=0.024). Malignant effusion (p=0.026) and infectious effusion (p=0.048) showed significantly higher level of VEGF than that of pneumothorax. VEGF level was substantially higher in malignant effusion compared with benign effusion (364.38$\pm$433.83 pg/dL vs. 53.3$\pm$22.20 pg/dL, p=NS). The pleural VEGF level did not correlate with the other markers. Conclusion: The measuring pleural VEGF may be helpful in diagnosing malignant and infectious pleural effusion that increase angiogenesis and vascular permeability, but it can not discriminate between the two. The pleural VEGF may not be correlated with the established markers. The measurement of pleural VEGF might discriminate between malignant and benign effusion.

• KIPS Transactions on Software and Data Engineering
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• v.12 no.5
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• pp.229-236
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• 2023

Since 3D printed medical implant parts usually have surface defects, it is necessary to inspect the surface after manufacturing. In order to automate the surface inspection, it is effective to 3D scan the implant and reconstruct it as a scan model such as a point cloud. When constructing a scan model, the characteristics of the shape and material of the implant must be considered because it has characteristics different from those of general 3D printed parts. In this paper, we present a method to reconstruct the 3D scan model of a 3D printed metal bone-plate that is one kind of medical implant parts. Multiple partial scan data are produced by multi-view 3D scan, and then, we reconstruct a scan model by alignment and merging of partial data. We also present the process of the scan model reconstruction through experiments.

• Journal of the Microelectronics and Packaging Society
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• v.24 no.2
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• pp.55-59
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• 2017

An optical method to inspect the 3-D shape of surface of Micro BGA is proposed, where spatially arranged LED light sources and specular reflection are considered. The reflected image captured by a vision system was analyzed to calculate the relative displacements of LED's in the image. Also, the statistics for all BGA's contained in a captured image are used together to find out the criteria for the detection of existing defects, and the usefulness of the proposed method is shown via experiments.

• Journal of the Korean Society of Radiology
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• v.17 no.7
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• pp.1099-1108
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• 2023

The mortise view radiography procedure is an ankle joint examination and observes the presence of trauma, sprain, or dislocation suspected in the ankle joint. The auxiliary equipment used during the mortise view radiography procedure can generate artifacts in the radiograph images and is not diverse enough to be custom-made for each patient; not cost-efficient. The purpose of this study is to create a custom assistive device to support mortise view radiography procedure. This study utilized 3D printing technology to create the mortise view radiography procedure assistive device (ShinHan Device; SHD). The lengths of the tibiotalar joint (TTJ), talar calcaneal joint (TCJ), and medial joint (MJ) were measured and evaluated by five researchers using both SHD and the prototype Hologic tool. The mean ranges were found to be 39.42-39.47 mm for TTJ, 31.41-31.57 mm for TCJ, and 21.21-21.23 mm for MJ while using SHD device. On the other hand, the measurements showed mean ranges of 39.73-39.79 mm for TTJ, 31.46-31.50 mm for TCJ, and 21.31-21.35 mm for MJ while using the Hologic tool. Based on this study results, the error ranges at all positions decreased by 24% for TTJ, 17% for TCJ, and 36% for MJ when using SHD device compared to the Hologic tool. Moreover, when SHD was used, it allowed for a highly reproducible examination posture (ICC = 0.99), and it enabled the acquisition of radiograph images without artifacts, which were present in the Hologic tool.