• The Journal of Engineering Geology
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• v.3 no.3
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• pp.231-239
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• 1993

This paper presents a result on the determination of velocity distribution by a tomographic inversion of crosshole seismic traveltimes in transversely isotropic(aniso tropic) media. The crosshole traveltimes used in this study are synthetic ones computed by ray tracing for some models having isotropic and transversely isotropic velocity distributions. The traveltimes are inverted by a general ART and ansotropic ART which considers the transversely isotropic effect during inver sion. The aniotropic ART gives accurate velodty distributions of transversely isotropic and isotropic models, while the isotropic ART determines accurate velocities only for the isotropic model but inaccurate for the transversely isotropic one. Therefore, the anisotropic ART may be used in case where no information is known on the isotropy or transverse isotropy of a survey area.

• Korean Journal of Head & Neck Oncology
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• v.33 no.2
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• pp.81-84
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• 2017

Langerhans cell histiocytosis (LCH) is a heterogeneous disease, characterized by accumulation of dendritic cells with features similar to epidermal Langerhans cells. It is a rare entity that may involve various organ levels such as the skeletal, pulmonary, hematopoietic and lympho-vascular systems. The patient was a 1-year-old female presented with fever associated with otorrhea and palpable cervical lymph node for 4 days. Neck ultrasonography and Computed tomography imaging revealed multiple enlarged lymph nodes suggesting suspicious malignant morphology. Lymph node biopsy was performed under general anesthesia. Histological and immunophenotypic examination showed the lymph node to be consistent with LCH. The patient was given chemotherapy.

• The Journal of the Korean bone and joint tumor society
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• v.12 no.1
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• pp.78-82
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• 2006

Kimura's disease is uncommon and chronic inflammatory disease of unknown etiology. It manifests as solitary or multiple subcutaneous nodule, primarily located on the cervical area with local adenopathies and salivary gland hypertrophy. Its clinical course is benign nature. Histologic findings are hyperplastic lymphoid tissue, inflammatory infiltrates rich in eosinophils and proliferations of capillary venules. Treatment options are steroid therapy, radiation therapy and surgical excision. We report two cases of Kimura's disease on medial aspect of upper arm.

• Journal of Yeungnam Medical Science
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• v.11 no.2
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• pp.375-380
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• 1994

The idiopathic hypereosinophilic syndrome consists of peripheral blood eosinophilia of $1500/mm^3$ or more without a known cause, plus signs and symptoms of organ eosinophilia. The prognosis of HES without treatment is poor. However, about one third of the patients with this syndrome may respond to corticosteroid thrapy. Morever, the majority of the remainder may have a favorable response to hydroxyurea. We present here a case of hypereosinophilic syndrome without any identifiable causes, involving bone marrow, liver, lungs and cervical lymph node. We tried corticosteroid as a treatment but it showed no response. However the hydroxyurea showed good response.

• Geophysics and Geophysical Exploration
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• v.5 no.3
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• pp.193-198
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• 2002

In crosswell ray tomography, the resultant velocity structure could be affected by source static, first-arrival-time picking errors, convergence to a local minimum due to an inappropriate initial velocity model and etc. In the paper, I propose an algorithm that automatically correct the souce static among these error-prone factors. The algorithm automatically corrects source static using the picking times' differences along the source direction. The application of the algorithm to real data produces a quite satisfactory result. Tile algorithm seems to be helpful for users to apply the souce static correction consistently and to acquire accurate velocity structure.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.11 no.2
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• pp.61-66
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• 1989

Osteopetrosis (Albers-Schonberg disease) is a rare disease characterized by generaized sclerosis of bones, hepatoslenomegaly, pancytopenia, multiple fracture, blindness. The disease shows characteristic radiographic feature and two rather well-defined pattern have been recognized. We experienced a case of osteopetrosis in a 31 year old man, who has had pus discharge and fetid odor after extraction of upper maxillary molar. We made a brief review of literature.

• Journal of Chest Surgery
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• v.30 no.8
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• pp.838-842
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• 1997

Atypical bronchopulmonary carcinoid is an uncommon pulmonary tumor, an intermediate form between low grade malignant typical carcinoid and high grade malignant small cell carcinoma which is considered neuroendocrine in origin and may produce various hormones. We describe an asymptomatic middle aged women with no elevated hormone level. Based on bronchoscopic biopsy initial diagnosis of atypical carcinoid with oncocytic change was established. The patient underwent right lower and middle lobe bilobectomy and medi stinal Iymph node dissection. Postoperative adjuvant radiation therapy was performed in 4 weeks.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.2535-2537
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• 2000

In order to detect and monitor the broken cords of steel-cord belt from being damaged by impact of large lump of materials and the corrosion of steel cord, we developed a non-contact magnetic coil detection system. This measures the deterioration of reinforcing cables in steel cord conveyor belt which transport the ores in raw material plant. In this research, magnetic coil sensor of broken-cord detection system has exciting part and sensing part. The broken-cord detection system is operated by supplying a transmitter coil with electric power to generate magnetic field, and then the change of induced voltage is detected in each receiver coils due to resultant magnetic flux effected by the broken steel cords at the inside of the conveyor belt. By the informations such as the position and size of the broken steel cords obtained by SCBMS(Steel Cord Belt Monitoring System), it is expected that not only the span of belt life will be lengthened, but also this system can enable operators to plan scheduled maintenance and prevent the enlargement of damaged parts in steel cord belt at an early stage

• Economic and Environmental Geology
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• v.28 no.5
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• pp.481-485
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• 1995

This paper presents a new approaching method to determine the velocity and geometry of shallow subsurface from seismic refraction events. After picking the first breaks from seismic refraction data, we assume that field refraction seismogram can be replaced by the unit delta function having time shift of first break. Time curves are generated by shooting ray tracing. The partial derivatives seismogram for a damped least squares method is computed analytically at each step of the forward ray tracing. The technique is successfully tested on synthetic and real data. It has the advantage of real full waveform inversion, which is robust at low frequency band even if the initial guess is far from the true model.

• Geophysics and Geophysical Exploration
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• v.7 no.4
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• pp.234-244
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• 2004

In order to calculate 3-dimensional wavefield using finite-element method in frequency domain, we must factor so huge sparse impedance matrix. Because of difficulties of handling of this huge impedance matrix, 3-dimensional wave equation modeling is conducted mainly in time domain. In this study, we simulate the 3-D wavefield using finite-element method in Laplace domain by combining high-performance parallel finite-element solver and SWEET (Suppressed Wave Equation Estimation of Traveltime) algorithm which can calculate the traveltime and the amplitude. To verify this combination, we applied it to the SEG/EAGE 3D salt model in serial and parallel computing environments.