• Journal of Korean Foot and Ankle Society
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• v.23 no.4
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• pp.159-165
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• 2019

Purpose: This study investigated the recurrence rate after performing hallux valgus correction using scarf and Akin osteotomy, and also identified the correlation and cut-off values of both the preoperative and postoperative radiographic parameters as risk factors for the recurrence of hallux valgus. Materials and Methods: We reviewed 87 hallux valgus patients (122 feet) who received scarf and Akin osteotomy from January 2007 to August 2015. The clinical outcomes were evaluated using the visual analogue scale (VAS) and American Orthopaedic Foot and Ankle Society (AOFAS) scores. The radiological outcome measures included the hallux valgus angle (HVA), intermetatarsal angle (IMA), and distal metatarsal articular angle (DMAA) as determined on the serial weight bearing radiographs. Recurrence was defined as more than 20 degrees of HVA noted on the final follow-up radiograph. Those radiological factors associated with recurrence were evaluated and analyzed. Results: The mean follow-up duration was 20.6 months (12.0~46.5 months) and the mean age was 44 years (13~80 years). The VAS and AOFAS scores were significantly improved at the time of the final follow-up (7.0 to 2.0, p<0.001; 78.0 to 92.0, p<0.001; respectively). Significant corrections in the HVA, IMA, and DMAA were obtained (p<0.001). Eleven (9.0%: 11/122) cases experienced recurrent hallux valgus deformity. The postoperative IMA, DMAA and HVA showed significant moderate to strong correlation with HVA at the final follow-up (Pearson correlation coefficient: 0.44, 0.70, and 0.88, respectively; p<0.001). Postoperative HVA>16.7 degrees, postoperative DMAA>13.9 degrees, and postoperative IMA>8.2 degrees showed statistically significant correlation with radiological recurrence at the last follow-up, and the odds ratio of each variable was high in order. Conclusion: Our radiographic results indicated that postoperative HVA>16.7 degrees, postoperative DMAA>13.9 degrees, and postoperative IMA>8.2 degrees can be risk factors for hallux valgus recurrence. These risk factors may be helpful for modifying surgical procedures and preventing the recurrence of hallux valgus.

• Proceedings of the Korean Geotechical Society Conference
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• 2009.09a
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• pp.133-144
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• 2009

Incheon Bridge, 18.4 km long sea-crossing bridge, will be opened to the traffic in October 2009 and this will be the new landmark of the gearing up north-east Asia as well as the largest & longest bridge of Korea. Incheon Bridge is the integrated set of several special featured bridges including a magnificent cable-stayed girder bridge which has a main span of 800 m width to cross the navigation channel in and out of the Port of Incheon. Incheon Bridge is making an epoch of long-span bridge designs thanks to the fully application of the AASHTO LRFD (load & resistance factor design) to both the superstructures and the substructures. A state-of-the-art of the geotechnologies which were applied to the Incheon Bridge construction project is introduced. The most Large-diameter drilled shafts were penetrated into the bedrock to support the colossal superstructures. The bearing capacity and deformational characteristics of the foundations were verified through the world's largest static pile load test. 8 full-scale pilot piles were tested in both offshore site and onshore area prior to the commencement of constructions. Compressible load beyond 30,000 tonf pressed a single 3 m diameter foundation pile by means of bi-directional loading method including the Osterberg cell techniques. Detailed site investigation to characterize the subsurface properties had been carried out. Geotextile tubes, tied sheet pile walls, and trestles were utilized to overcome the very large tidal difference between ebb and flow at the foreshore site. 44 circular-cell type dolphins surround the piers near the navigation channel to protect the bridge against the collision with aberrant vessels. Each dolphin structure consists of the flat sheet piled wall and infilled aggregates to absorb the collision impact. Geo-centrifugal tests were performed to evaluate the behavior of the dolphin in the seabed and to verify the numerical model for the design. Rip-rap embankments on the seabed are expected to prevent the scouring of the foundation. Prefabricated vertical drains, sand compaction piles, deep cement mixings, horizontal natural-fiber drains, and other subsidiary methods were used to improve the soft ground for the site of abutments, toll plazas, and access roads. Light-weight backfill using EPS blocks helps to reduce the earth pressure behind the abutment on the soft ground. Some kinds of reinforced earth like as MSE using geosynthetics were utilized for the ring wall of the abutment. Soil steel bridges made of corrugated steel plates and engineered backfills were constructed for the open-cut tunnel and the culvert. Diverse experiences of advanced designs and constructions from the Incheon Bridge project have been propagated by relevant engineers and it is strongly expected that significant achievements in geotechnical engineering through this project will contribute to the national development of the longspan bridge technologies remarkably.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.26 no.1
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• pp.1-7
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• 2013

Structural design and analysis of a coiling arm unloading machine for submarine cable have been originally conducted in this study. Three-dimensional CAD modeling process is practically applied for the structural design in detail. Finite element method(FEM) and multi-body dynamics(MBD) analyses are also used to verify the safety and required motions of the designed coiling arm structure. The effective moving functions of the designed coiling arm with respect to rotational and radial motions are achieved by adopting bearing-roller mechanical parts and hydraulic system. Critical design loading conditions due to its self weight, carrying cables, offshore wind, and hydraulic system over operation conditions are considered for the present structural analyses. In addition, possible inclined ground conditions for the installation of the designed coiling arm are also considered to verify overturn stability. The present hydraulic type coiling arm system is originally designed and developed in this study. The developed coiling arm has been installed at a harbor, successfully tested its operational functions, and finished practical unloading mission of the submarine cable.

• Journal of the Korean GEO-environmental Society
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• v.19 no.11
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• pp.5-14
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• 2018

Worldwide, soil compaction work is one of the most important activities that are carried out on civil engineering works sites. Compaction work, particularly in the area of road construction, is considered to be important, as poor compaction work is closely related with poor construction even after a construction is complete. Currently, the plate bearing test or the sand cone method relative to the unit weight of soil test are commonly used to measure the degree of compaction, but as these require a great deal of time, equipment and manpower, it is difficult to secure economic efficiency. The method that is used to measure the degree of compaction according to the penetration depth achieved by free fall objects through gravity is the Free-Fall Penetration Test (FFPT), which uses a so-called "portable compaction measuring meter (PCMM)." In this study, the degree of compaction was measured and a penetration depth graph was developed after the field test using the portable compaction measuring meter. The coefficient of determination was 0.963 at a drop height of 10 cm, showing the highest level of accuracy. Both horizontal axis and longitudinal axis were developed in a decimal form of graph, and the range of allowable error was ${\pm}1.28mm$ based on the penetration depth. The portable compaction measuring meter makes it possible to measure the degree of compaction simply, quickly and accurately in the field, which will ensure economic efficiency and facilitate the process management.

• Journal of Society of Preventive Korean Medicine
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• v.13 no.2
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• pp.51-64
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• 2009

Objective : This research was aimed to investigate the anti-tumor effect, safety, mechanism and metabolizing enzyme of Agrimonia pilosa LEDEB(APL) in female C57B/L mouse. Methods : At first, to evaluate the anti-tumor activity of APL, we divided into four groups, normal, control, APL100(100mg/kg), APL150(150mg/kg). LLC obtained American Type Culture Collection was used. LLC had been inoculated to induce tumor. To measure the anti-tumor effect of APL, we calibrate tumor size and weight. To study for mechanism of anti-tumor in APL, we used western blotting and to know metabolizing enzyme in APL we used to real-time PCR. Results : APL100, APL150 inhibited tumor growth after medicine injected. APL did not only induced caspase-dependent apoptosis in LLC-bearing mouse tumor. In APL100, it were decreased 72% in CYP3A11. In APL150, it were decreased 62%, 75% in CYP3A11 and MRP1a respectively. Conclusion : These results suggests that APL has some anti-tumor effects in female C57B/L mouse tumor. APL should be careful use with other drugs related with CYP3A11 or MRP1a.

• Journal of Bio-Environment Control
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• v.19 no.3
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• pp.130-134
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• 2010

To investigate effects of deep tillage before planting on physicochemical properties of soil, growth and fruit characteristics in cultivation of watermelon (Citrullus vulgaris L. cv. 'Uriggul') under plastic film house, this study was conducted in cultivating field of Gochang Junbuk. pH in soil after harvest compared with soil before planting of watermelon had almost no change, but EC lowed greatly in the two treatments. Available phosphate concentration in the soil with the deep tillage treatment was lower, K concentration of exchangeable cation decreased greatly than these with conventional tillage treatment. In the growth at 27th day after planting plant, stem length to 10th node from the first node, leaf width with deep tillage treatment were longer, bearing node of the first and second flower and wilting degree were lower than these with conventional tillage treatment. In the growth of harvesting time, the stem length to 30th node from the first node with the deep tillage treatment were longer, leaf discoloration degree was lower than these with conventional tillage treatment. Also, the harvested fruits length, diameter, peel hardness, and weight were significantly better than these with conventional tillage treatment.

• Journal of Navigation and Port Research
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• v.41 no.6
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• pp.451-466
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• 2017

Deep-sea fishing vessel No. 501 Oryong was fully flooded through its openings and sunk to the bottom of the sea due to the very rough sea weather on the way of evasion after a fishing operation in the Bearing Sea. As a result, many crew members died and/or were missing. In this study, a full-scale ship flooding sinking simulation was conducted, and the sinking process was analyzed for the precise and scientific investigation of the sinking accident using highly advanced Modeling & Simulation (M&S) system of Fluid-Structure Interaction (FSI) analysis technique. To objectively secure the weather and sea states during the sinking accident in the Bering Sea, time-based wind and wave simulation at the region of the sinking accident was carried out and analyzed, and the weather and sea states were realized by simulating the irregular strong wave and wind spectrums. Simulation scenarios were developed and full-scale ship and fluid (air & seawater) modeling was performed for the flooding sinking simulation, by investigating the hull form, structural arrangement & weight distribution, and exterior inflow openings and interior flooding paths through its drawings, and by estimating the main tank capacities and their loading status. It was confirmed that the flooding and sinking accident was slightly different from a general capsize and sinking accident according to the simple loss of stability.

• Journal of Veterinary Clinics
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• v.28 no.5
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• pp.467-472
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• 2011

This study was conducted to describe clinical presentation of pelvic fracture and compare clinical outcomes of each part of pelvic fractures in 54 client-owned dogs. There was an average of 3.61 pelvic fractures per dog and 47 dogs had more than two fractures. The average time until initial weight-bearing on the affected leg, hospitalization after surgery, and lameness score at final check in 31 dogs that underwent surgery were 7.04 days, 16.39 days, and 1.25, respectively, and there were no significant difference in the incidence of sacroiliac luxation, iliac fracture, and acetabular fracture among them. The length of hospitalization and the lameness score upon final check of the dogs with over two surgically repaired sites were significantly longer and higher than those of the dogs with one surgically repaired site (P = .043 and P = .008, respectively). Upon final check of the dogs with bilateral pelvic fracture that was surgically treated, the hospitalization and lameness score were significantly longer and higher than those of dogs with unilateral pelvic fracture that was surgically treated (P = .034 and P = .033), respectively. The number of pelvic fractures treated surgically appears to be a more influential factor influencing recovery from pelvic fractures than the location of the pelvic fractures.

• Journal of Oriental Physiology
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• v.14 no.2 s.20
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• pp.229-237
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• 1999

Hwanhonsan has been used for curing tumor as a Oriental medicine without any experimental evidence to support the rational basis for their clinical use. This experiment was carried out to evaluate the possible therapeutic or antitumoral effects of Hwanhonsan extract against cancer, and to study some mechanisms responsible for its effect. Some kind of tumors were induced by the typical application of 3-methylcholanthrene(MCA) or by the implantation of malignant tumor cells such as leukemia cells(3LL cells) or sarcoma cells(S180 cells) and FasII cells. Treatment of the Hwanhonsan extract(daily 1 mg/mouse, i.p.) was continued for 7 days prior to tumor induction and after that the treatment was lasted for 20 hrs. Against squamous cell carcinoma induced by MCA, Hwanhonsan decreased. not only the frequency of tumor production but also the number and weight of tumors per tumor bearing mice(TBM). Hwanhonsan also significantly suppressed the development of 3LL cells and S180 cells implanted tumors by frequency and their size, and some developed tumors were regressed by the continuous treatment of Hwanhonsan extract into TBM. However, when tumor was induced by FsaII cells implantation, the growth of implanted cells in mice was delayed by the water extract of Hwanhonsan until 7 days and then rapid growth ensued. In vitro treatment of Hwanhonsan extract had no inhibitory effect on the tumor induced by some kind of cell lines such as A431 cells strain but it significantly inhibited the proliferation of 3LL cells, S180 cells. These results suggested that Hwanhonsan extract exhibited a significant prophylactic benefits against tumors and its antitumor activity was manifested depending on the type of tumor cells.

• Journal of Physiology & Pathology in Korean Medicine
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• v.20 no.4
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• pp.825-829
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• 2006

Rhus verniciflua Stokes has been used for treatment of blood stasis and abdominal mass in Oriental medicine. Rhus verniciflua Stokes has been experimentally reported to exert antioxidant, antiproliferative, antithrombotic and apoptotic activities. In the present study, the antiangiogenic and in vivo antitumor activities of aqueous extract of processed Rhus verniciflua Stokes (Nexia) by heat were examined to elucidate its anticancer mechanism. Nexia showed weak cytotoxiicty against human umbilical vein endothelial cells (HUVEC) and Lewis lung carcinoma cells (LLC) with IC50 of${\sim}200\;{\mu}g/ml\;and\;>200\;{\mu}g/ml$, respectively. Nexia significantly inhibited the proliferation and migratory activity in vascular endothelial growth factor(VEGF) treated HUVEC. Furthermore, Nexia effectively suppressed the tumor volume in A549 nonsmall lung cancer bearing athymic nude mice, CanN. Cg-Foxn 1nu/CrljBgi up to 40.7% as well as tumor weight incised from LLC cells innoculated into the flank of C57BL/6 mice up to -50% compared with untreated control at a dose of 300 mg/kg. Taken together, these results suggest that processed Rhus verniciflua Stokes may inhibit the growth of Lewis lung carcinoma cells partly via inhibition of angiogenesis and can be potently applied to angiogenesis dependent cancers. However, it still needs a further research on molecular mechanism, angiogenesis animal study and clinical trial in future.