• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.4D
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• pp.561-567
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• 2008

In this study, shoreline change was analyzed by RTK-GPS and advanced airborne LiDAR survey. For extraction of coastline, first of all, tide correction was conducted at all RTK-GPS points through the comparing with the corresponding tidal height, and cross section providing coastline was produced using Autocad Civil3D program. Comparing with two results of RTK-GPS (first, 29 Aug 2007; second, 6 Oct 2007) surveys, coastline of the first result had been decreased about 21m compare with that of the second. And it was also demonstrated that the length of coastline by the first RTK-GPS was 15m shorter than that by the airborne LiDAR survey (Dec. 2006). In addition, we recoquized that the erosion appeared in the top right-hand (dock area); the sediment in the bottom left-hand (Chosun beach area) of the Haeundae beach. As a result, therefore, it was learned that artificial sand filling for beach open and natural effects such as a typhoon, current drift, wind direction gave cause for area changes and coastline.

• Journal of the Korean Society of Radiology
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• v.83 no.4
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• pp.830-845
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• 2022

The male breast is a non-functional and rudimentary organ, but similarly to the female breast, it can be affected by various diseases. In contrast to female breast cancer, male breast cancer has a low incidence, and there is no established breast cancer screening program for male patients. Therefore, the diagnostic evaluation is usually performed in male patients with symptoms such as palpability or pain in the breasts. Furthermore, most adult male patients who visit breast clinics sometimes present with not only breast symptoms but also axillary symptoms, and both the breast and axilla are usually examined during breast ultrasonography in daily clinical practice. The purpose of this pictorial essay was to present the sonographic features of various palpable breast and axillary lesions in adult male patients.

• Korean Journal of Radiology
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• v.20 no.4
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• pp.609-620
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• 2019

Minimally invasive treatment of symptomatic thyroid nodules is now commonplace. Ethanol ablation (EA) of thyroid cystic nodules has been performed since the 1990s, but there is no global consensus or guideline. Although various limitations of EA have been described, recommendations for practical application are necessary. Therefore, the Task Force Committee of the Korean Society of Thyroid Radiology initiated the present consensus statement and here we provide recommendations for the role of EA in the management of symptomatic thyroid nodules. These recommendations are based on evidence to date from the literature and expert opinion.

• Journal of the Korean Orthopaedic Association
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• v.52 no.1
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• pp.83-91
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• 2017

Purpose: To investigate the clinical outcomes of distal hook augmentation using a pedicle screw in thoracolumbar fusion in elderly patients. Materials and Methods: This retrospective multicenter study recruited 20 patients aged 65 years or older, who underwent anterior support and long level posterior fusion in the thoracolumbar junction with a follow-up of one year. To assess the effect of distal hook augmentation, the patients were divided into two groups; the pedicle screw with hook group (PH group, n=10) and the pedicle screw alone group (PA group, n=10). Results: The average age was 72.4 years (65-83 years). The average fusion segment was 4.6 segments (3-6 segments). There were no significant differences in age, sex, causative diseases, bone mineral density of lumbar and proximal femur, number of patients with osteoporosis, and number of fused segments between the two groups (p≥0.05). At 1 year follow-up after surgery, parameters related with distal screw pullout were significantly worse in the PA group. No patients in the PH group had distal screw pullout. However, six patients (60%, 6/10) in the PA group had distal screw pullout. There were no significant differences in the progression of distal junctional kyphosis between the two groups. Conclusion: Distal hook augmentation is an effective procedure in protecting distal pedicle screws against the pullout when long level thoracolumbar fusion was performed in elderly patients aged 65 years or older.

• Journal of the Korean Society of Radiology
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• v.82 no.2
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• pp.406-416
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• 2021

Purpose To evaluate the association between magnetic resonance imaging (MRI)-based texture parameters and Kirsten rat sarcoma viral oncogene homolog (KRAS) mutation in patients with non-mucinous rectal cancer. Materials and Methods Seventy-nine patients who had pathologically confirmed rectal non-mucinous adenocarcinoma with or without KRAS-mutation and had undergone rectal MRI were divided into a training (n = 46) and validation dataset (n = 33). A texture analysis was performed on the axial T2-weighted images. The association was statistically analyzed using the Mann-Whitney U test. To extract an optimal cut-off value for the prediction of KRAS mutation, a receiver operating characteristic curve analysis was performed. The cut-off value was verified using the validation dataset. Results In the training dataset, skewness in the mutant group (n = 22) was significantly higher than in the wild-type group (n = 24) (0.221 ± 0.283; -0.006 ± 0.178, respectively, p = 0.003). The area under the curve of the skewness was 0.757 (95% confidence interval, 0.606 to 0.872) with a maximum accuracy of 71%, a sensitivity of 64%, and a specificity of 78%. None of the other texture parameters were associated with KRAS mutation (p > 0.05). When a cut-off value of 0.078 was applied to the validation dataset, this had an accuracy of 76%, a sensitivity of 86%, and a specificity of 68%. Conclusion Skewness was associated with KRAS mutation in patients with non-mucinous rectal cancer.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2007.04a
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• pp.225-230
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• 2007

Currently, looking at the field of producing national coastlines, the lengths of coastlines are inaccurate due to the vague definition of dividing coastline boundaries and insufficient observation data. The level of accuracy and reliability of previous data are also in the very low. This paper used aerial photographs with certain intervals to monitor the change in coastal areas of Songjeong, Haeundae, Kwanganri, Songdo and Dadaepo. The local area subjected for this research was limited to areas near Busan. Launching quantitative/time series analyses on the change of coastal areas using aortal photographs, satellite image data and RTK-GPS surveys. And developing an automatic edge detection program to extract coastlines, suggesting the performance of the program and analyzing the efficiency of the program.

• Journal of Chest Surgery
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• v.47 no.2
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• pp.174-177
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• 2014

Surgical revascularization for patients with Buerger's disease is possible only in a few cases, due to the diffuse segmental involvement and the lack of distal runoff vessels available for bypass surgery. We encountered a case of resting pain in the right foot, coldness with dysesthesia, and cyanosis on the right 1st toe. The patient was treated with an endovascular intervention after vein patch angioplasty failed due to an inflammatory reaction of Buerger's disease. We suggest that an endovascular procedure can be an effective treatment, even in addition to more conservative and surgical management, in patients with Buerger's disease and critical limb ischemia.

• Korean Journal of Environmental Biology
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• v.29 no.3
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• pp.202-207
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• 2011

Bacterial contamination of beach sand was examined in April, June, July, and August. Twenty four topsoil and subsoil samples were taken from the 1m and 5m points from the coastline in three Busan beaches (Haeundae, Gwanganli, and Songjeong). The 5m points from the coastline showed higher coliform contamination than 1 m points. July showed the highest bacterial contamination on beaches among surveyed months. Coliform contamination in the subsoil was higher than that of the topsoil. The bacterial contamination of 5m points of topsoil and subsoil in June except the Songjeong Beach was higher than those of July and August. We investigated Staphylococcus aureus, Vibrio parahaemolyticus, Vibrio vulnificus, Vibrio cholerae, and Bacillus cereus. Only B. cereus was detected at the beach in August. Although microbiological pollution of the Gwanganli Beach was the highest among three Busan beaches, the degree of contamination was not high compared to those of other countries. However, sandy soil management in public beach for pathogenic microorganisms is needed.

• Journal of Environmental Science International
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• v.12 no.12
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• pp.1197-1206
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• 2003

As growing importance and concern of waterfront, we have tried to study its landscape, accessibility, landuse and so on as well as its environmentally sound and sustainable development. In fact we had been under the false thought that it always gaves what we wanted, and it was neglected in its economic value. This paper/looks at one alternative, the non-market value generated by management of waterfront as public resources. We consider the question : how much are people willing to pay to improve, how much are people want to improve\ulcorner The contigent valuation method was implemented during Sep. 9 to 14 in 3 beaches ; haeundae, Gwanganri, Songjeong. They are representative waterfronts which have been widely known and visited. We find out that households are willing to pay about 12,000-16,000 den per year for improving nature elements and inviting more valuable functions about 3 beaches. Especially Ive pay attention to difference between cognitive and comprehensive satisfaction 3 beaches and their substructural factors satisfaction such as natural environment, public facilities, recreational facilities and etc.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2006.04a
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• pp.71-76
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• 2006

우리나라 대표적인 해운대 해수욕장은 백사장의 길이가 현재 약 1,400m, 폭은 $35{\sim}45m$, 평균수심은 약 1m에 달하는 대규모 해수욕장이다. 그리고 수심이 낮고 조차가 적으며, 수온이 따뜻하여 천혜의 조건을 갖춘 한국 최대의 해수욕장으로 한해 약 1200만 명이 넘는 관광객이 찾는 대표적인 명소이기도 하다. 그러나 지난 수십 년간의 해빈 유실로 인한 해수욕장의 존립자체의 위기가 현실화되고 있다. 해수욕장의 모래유실은 다년간에 걸쳐 진행되고 있으며, 여러 요인에 의하여 해안선의 위치와 폭이 달라지고 있다. 본 논문에서는 부산지역의 해운대 해수욕장을 선정하여 실험지역에 대한 측량을 RTK 방식으로 4개월간 3회에 걸쳐 실시하였다. 측량결과 1, 2, 3차에 걸쳐 총 3.36m의 해안선 증가의 효과가 나타남을 알 수 있었다. 또한, 모래포집시설을 설치하기 전, 후를 기점으로 비교한 결과를 파악하였으며, 향후 해빈 유실의 원인과 방지대책, 그리고 해안선 추출의 모니터링 시스템에 대하여 모색하고자 한다.