• KSCE Journal of Civil and Environmental Engineering Research
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• v.39 no.1
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• pp.115-122
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• 2019

Steel Fiber Reinforced Wet-type Shotcrete improves the quality and stabilizes the tunnel by increasing the shear strength of the natural ground by constructing the concrete which attaches the fresh concrete to the predetermined position from the nozzle. The Steel Fiber Reinforced Wet-type Shotcrete improves and reinforces the strength and dynamic behavior characteristics of concrete to suppress the generation and growth of local cracks by increasing the tensile resistance ability. In addition, Steel Fiber Reinforced Wet-type Shotcrete is a shotcrete that improves tensile strength, bending strength, and crack resistance by dispersing discontinuous short steel fibers evenly in concrete. In this study, compressive strength test and bending strength test of shotcrete of NATM tunnel were measured and rebound reduction rate was measured by varying shotcrete putting pressure to 900 RPM, 1,000 RPM, and 1,100 RPM. Therefore, the data that can be applied to domestic NATM tunnel construction are presented.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.14 no.2
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• pp.102-105
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• 2018

Hemophilia is an X-linked herediatry disorder. Hemophilia A is a defiency of factor VIII and hemophilia B (Christmas disease) is a deficiency of factor IX. The most widely used classification is based on plasma procoagulant levels, with people <1% factor defined as severe; 1 - 5% moderately severe; and >5% as mild. A 7 years old boy visited our clinic with chief complaint of impacted supernumerary tooth. This boy had severe hemophilia A. With the previous $ADVATE^{(R)}$ injection and factor VIII replacement, Extraction of supernumerary tooth was successfully done under General anesthesia. A 9 years old boy referred from local clinic for dental caries treatment. This boy had severe hemophilia B. With the preparation of $BeneFIX^{(R)}$ injection, dental treatment was done successfully under general anesthesia. It is often first detected by dental trauma. Since bleeding after dental treatment may cause severe or even fatal complications, people with hemophilia must be given special dental care. The treatment of the patients with either hemophilia A or hemophilia B involves the intravenous infusion to either control or prevent bleeding.

• Clinics in Shoulder and Elbow
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• v.25 no.1
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• pp.28-35
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• 2022

Background: Given the complications involved in corticosteroid (CS) injections, subacromial platelet-rich plasma (PRP) injections may provide a valid alternative to CS in the treatment of rotator cuff (RC) tendinopathy. Methods: We retrospectively reviewed a total of 98 patients affected by RC tendinopathy who were treated with either subacromial injection of PRP or CS. The PRP group received three injections of autologous PRP at 2 weeks interval, and the CS group received one injection of CS. The Western Ontario Rotator Cuff Index (WORC) was the primary outcome measure, while the secondary outcome measures were the visual analog scale (VAS), range of motion (ROM), and need for cuff repair surgery, which were analyzed at intervals of 6, 12, and 18 months. Results: A total of 75 patients were included in the analysis (PRP, n=35; CS, n=40). The mean follow-up for PRP was 21.1±8.7 months and for CS was 33.6±16.3 months (p<0.001). Both groups showed improvement in WORC, VAS, and ROM. No significant differences were detected between the two groups in any of the primary (WORC) or secondary outcomes over 6, 12, and 18 months (all p>0.05). No adverse events were detected. Conclusions: Both treatments improved patient symptoms, but neither resulted in a significantly better outcome in this series of patients. PRP can be a safe and feasible alternative to CS, even at long-term follow-up, to reduce local and systemic effects involved with CS injections.

• The Journal of Korean Orthopaedic Ultrasound Society
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• v.4 no.2
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• pp.101-110
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• 2011

To describe the background, mechanism, clinical results and complications of prolotheapy based on the literature review. Prolotherapy is a minimally invasive injection-based treatment of chronic musculoskeletal pain, including ligament and joint laxity. The mechanism of this injection-based technique is to initiate a local inflammatory response with resultant tissue healing. The used proliferants are classified by bio-mechanism to act in three different ways as osmotic, irritants, and chemotatics. The most commonly used proliferant is hyperosmolar (10~25%) dextrose to act by osmotic rupture of cells. High resolution ultrasound imaging of musculoskeletal structure provide a more accurate diagnosis. Also ultrasound-guided intervention provides a more high efficacy and low rate of complications. The most common complication is local pain at the injected site, that is self-limited and good responsive to anti-inflammatory agents. Other complications are rare. It is reported that prolotherapy appears safe when performed by an experienced clinician. Prolotherapy has grown in popularity and has received significant recent attention. However there are limited evidence-based data supporting the indication and efficacy of prolotherapy in the treatment of chronic musculoskeletal pain or soft tissue injuries. Future studies are necessary to determine whether prolotherapy can play an independent and definitive role in a treatment for chronic musculoskeletal pain.

• Journal of the Korean Magnetics Society
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• v.2 no.1
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• pp.1-7
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• 1992

Deuterium was injected into melt-spun ribbons of ${\alpha}-Fe_{90}Zr_{10}$ using the electrolytic hydrogenation method, and the magnetic properties of these ${\alpha}-D_{x}Fe_{90}Zr_{10}$ ribbons were studied. By comparing these results with those of ${\alpha}-H_{x}Fe_{91}Zr_{9}$, the effects of phonons to magnetic properties were investigated. The Curie temperature $T_{c}$, and the spontaneous magnetizations of the $D_{47}Fe_{90}Zr_{10}$ and the $Fe_{90}Zr_{10}$ were studied using the Mbssbauer spectroscopy. From these investigations, it was found that the Curie temperature of $D_{x}Fe_{90}Zr_{10}$ was 75K higher than that of $Fe_{90}Zr_{10}$. It was believed that this indicated the importance of local deformation to the amorphous magnetism. Also by comparing the spontaneous magnetizations of $D_{47}Fe_{90}Zr_{10}$ with those of $Fe_{90}Zr_{10}$ as a function of temperature, it was found that the deuterium injection reduced the fluctuation of exchange integral.

• Journal of Chest Surgery
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• v.34 no.11
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• pp.875-878
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• 2001

Background: Although sclerotherapy is an established procedure in treating varicose veins, a wide disparity remains in the rates of success. The purpose of this study was to evaluate the effectiveness and complications of sclerotherapy in combination with compression. Material and Method: From December 2000 to September 2001, a combined total of 50 legs in 39 patients with primary varicose veins were treated with sodium tetradecyl sulfate as sclerosant with the empty vein technique. Immediately after the injection, local compression was increased by a cotton wool roll, and additional compression was obtained with class II medical compression hosiery. Patients were evaluated at 5 days, 1 week, 2 weeks, and 6 weeks for degree of improvement and complications. Result: There were 36 women and 3 men ranging in age from 26 to 66 years, with a mean age of 45.3 years. Good sclerosing results were obtained in all patients. Of fifty legs, five had minor complications, two small intravascular clots, two pigmentations, and one compression-related bulla, which needed no treatment. Conclusion: The use of a cotton wool roll for local compression is highly effective, and sclerotherapy in combination with compression is safe and effective in the treatment of varicose veins.

• The Korean Journal of Pain
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• v.4 no.2
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• pp.157-161
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• 1991

Low back pain and/or lumbosacral radiculopathy have become one of the most common pain problems in our pain clinic center. There are several kinds of conservative management for low back pain and/or lumbosacral radiculopathy. We as pain clinicans, focused on epidural administration of local anesthetics and steroids. The rationale for epidural steroid administration is to reduce inflammation and to inhibit the action of nociceptive agents. Eighty mg of methylprednisolone acetate in 10 ml of 0.25% bupivacaine was infected, into epidural space 3 times at one week intervals for 1 year, to 921 patients(male: 422, female: 499) seen in the period between March 1986 and December 1989. The effectiveness was evaluated a month after the final injection. The results were as follows: Excellent pain relieved group 122 patients(13.25%) Good pain relieved group: 485 patients(52.66%) Fair pain relieved group: 184 patients(19.98%) No effect group: 130 patients(14.11%) We recommend the epidural steroid inject to the patients following failure of conservative management of discogenic pain.

• The Korean Journal of Pain
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• v.13 no.1
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• pp.74-78
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• 2000

Background: Epidural Adhesiolysis is an interventional pain management technique for patients with low back pain. In addition to local anesthetics and corticosteroid, hypertonic saline (NaCl) are used for the technique. Present study was aimed to compare analgesic and adverse effects of two different concentration of hypertonic saline in Epidural Adhesiolysis. Methods: Fifty-three subjects with low back pain with radiculopathy were assigned to one of two epidural adhesiolysis treatment groups: 8% (Group I, n=26) or 10% (Group II, n=27) hypertonic saline. 17 G epidural needle was inserted at sacral hiatus and catheter was advanced untill its tip was located at lesion site under fluoroscopic guidance. Subjects in all treatment groups received epidural corticosteroid and local anesthetic. And then, hypertonic saline injection via catheter were carried out daily for 3 days. Evaluation included assessment of pain relief (Numerical Rating Scale; NRS) at post-epidural adhesiolysis 1, 2, 3 days, 1 week, and 1, 3 months. We also looked for complications of epidural adhesiolysis at different concentration of hypertonic saline. Results: Statistical analysis demonstrated that NRS was not significantly different between two groups during 3 months after epidural adhesiolysis. There were no major differences of complications between two groups and disappeard after a few months without residual sequelae. Conclusions: We conclude that epidural adhesiolysis using 8% hypertonic saline is effective for relief of low back pain with proven lumbosacral fibrosis without any residual sequelae compared with 10%.

• Journal of Korean Neurosurgical Society
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• v.29 no.2
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• pp.155-166
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• 2000

This study was designed to investigate the underlying mechanisms for the temporal changes of the striatal dopamine D2 receptors in the rat model of parkinsonism. After injection of the 6-hydroxydopamine into the substantia nigra of adult rats, we measured the receptor binding capacity(Bmax), mRNA and protein of the D2 receptor at 2, 4 and 8 weeks. Following the lesion, mRNA and protein were elevated simultaneously on both sides of the striata. They showed more increase on the normal side at 2 and 4 weeks, and then they were almost equally abundant on both sides at 8 weeks. We also observed their increased production in the diffuse cortical and subcortical regions. The Bmax value also increased bilaterally in both striata, and was higher on the normal side at 2 weeks and then on the lesioned side at 4 and 8 weeks. These findings suggest that production of the striatal D2 receptor is regulated at the transcriptional level in this animal model. They also imply that this control may be mediated through a pathway which can have influence on the whole brain, rather than the local control of the dopamine content alone. The measured functional activity(Bmax) of the D2 receptor was not proportional to the amount of the receptor mRNA and proteins produced. This difference may be explained by the post-translational modification of the receptor proteins, which may be controlled by such factor as the local concentration of dopamine.

• Journal of Korean Society of Environmental Engineers
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• v.27 no.10
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• pp.1043-1051
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• 2005

In this stduy, adsorption and transport characteristics of Fe in the soil were investigated using convection-dispersion local equilibrium sorption model and two-site non-equilibrium sorption model. In batch experiments with different Fe concentration, characteristics of Fe adsorption was investigated using Freundlich and linear isotherm. Column experiments with different flow rate, organic matter content md Fe concentration were also carried out. We measured Fe concentrations in injection-liquid and in effluent, and then applied them to CXTFIT program. As a result of column experiments, some parameters(D, R, ${\beta}$, ${\omega}$) used in two-site non-equilibrium adsorption model were obtained. Characteristics of Fe transport were analyzed using the parameters(D, R, ${\beta}$, ${\omega}$) obtained from the CXTFIT program, Consequently, characteristics of Fe transport in the soil were predicted through two-site non-equilibrium adsorption model.