• 대한세포병리학회지
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• 제6권2호
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• pp.133-139
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• 1995

To evaluate the sensitivity and specificity of transthoracic fine needle aspiration cytology(TFNAC) in the preoperative diagnosis of pulmonary nodules, a retrospective analysis was carried out on a consecutive series of 200 TFNACs. They included 186 primary malignant tumors, 66 squamous cell carcinomas, 65 adenocarcinomas, 36 small cell carcinomas, 7 large ceil carcinomas, 4 carcinomas, 8 others, 9 metastatic tumors, and 5 benign tumors. On cytohistologic correlation of malignant pulmonary tumors, the procedure had a sensitivity of 97.3% and a specificity of 100%. A 86.6% correct correlation between the cytologic and histologic diagnoses was achieved. Five out of the 7 undifferentiated large cell carcinomas, 10 out of the 65 adenocarcinomas, 2 out of the 36 small cell carcinomas, and 2 out of the 66 squamous cell carcinomas were turned out to be mistyped in cytologic diagnosis. We concluded that TFNAC is a highly sensitive and specific preoperative diagnostic procedure in the investigation of patients with discrete pulmonary nodules in whom the specific ceil type of the malignant neoplasm has important implications in treatment modality and prognosis.

• 대한세포병리학회지
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• 제10권1호
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• pp.43-53
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• 1999

We retrospectively reviewed the results of 1,850 fine needle aspiration cytology(FNAC) of thyroid nodules performed from 1990 to 1991 in the Department of Pathology, Seoul National University Hospital. Among 1,528 cases and 322 cases aspirated by clinicians and a pathologist, 465 cases(30.4%) and 13 cases(4.0%) of the aspirates were inadequate, respectively. In 227 cases, correlation of the FNAC diagnosis and histologic diagnosis was done. Excluding the inadequate cases, the sensitivity nor the detection of neoplasm(malignancy together with follicular adenoma) was 86.4% and the specificity was 70.7%. The overall diagnostic accuracy was 79.0%. There were 16 false-positive cases(7.0%), and 19 false-negative cases(8.4%). The predictive value of each cytologic diagnosis was 92% in papillary carcinoma, and 100%, in Hashimoto's thyroiditis. The expectancy of malignancy was 52.8% in "suspicious malignancy" and 26.7% in "atypical lesion".

• Archives of Plastic Surgery
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• 제33권2호
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• pp.241-244
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• 2006

Idiopathic scrotal calcinosis is rare entity, characterized by the presence of multiple, firm nodules within the dermis of scrotal skin. The lesions are evident as asymptomatic, round, firm, yellowish papules, from several millimeters up to 1 cm in diameter, with a tendency to occur symmetrically. Because polypoid formation of the calcified cysts is unusual in scrotal calcinosis, we report our experience of a case of scrotal calcinosis with cysts having polypoid appearence. A 34-year-old man was admitted to our department with painless, firm, widespread nodules within the scrotum. Patient started to have these lesions at puberty and progressed to a polypoid form over time. There was neither surgical nor medical treatment had been attempted before our treatment. Physical examination revealed localized polypoid cysts in addition to multiple small, firm nodules within the scrotal skin. No underlying anomalies were detected in the physical examination and laboratory analysis. We experienced the treatment of polypoid idiopathic scrotal calcinosis and a case is presented with the review of literatures.

• 한국멀티미디어학회논문지
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• 제20권7호
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• pp.994-1003
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• 2017

Ground-glass opacity nodules(GGNs) in chest CT images are associated with lung cancer, and have a different malignant rate depending on existence of solid component in the nodules. In this paper, we propose a method to classify pure GGNs and part-solid GGNs using multiview images and texture analysis in pulmonary GGNs with solid components of 5mm or smaller. We extracted 1521 features from the GGNs segmented from the chest CT images and classified the GGNs using a SVM classification model with selected features that classify pure GGNs and part-solid GGNs through a feature selection method. Our method showed 85% accuracy using the SVM classifier with the top 10 features selected in the multiview images.

• Clinical and Experimental Pediatrics
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• 제45권12호
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• pp.1596-1600
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• 2002

저자들은 속립성 결핵으로 진단한 23개월된 여아에서 신경학적인 증상이 나타나기 전인 초기의 속립성 뇌결핵에서 뇌자기공명영상 소견 및 치료에 따른 경시적 호전 양상의 변화를 자기공명영상소견으로 얻었기에 보고하는 바이다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.891-895
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• 1996

Performance and efficiency of hybrid (hydraulic-mechanical) pick-up device of deep sea manganese nodules collector are very sensitive to altitude and altitude of pick-up head relative to undulating seafloor. For this reason, motion control of pick-up head relative to the changing deep sea topography and other disturbances is of particular importance in design of pick-up device. The concept of design axiom is applied to a pick-up device of hybrid type. Kinematic analysis conducted in absolute Cartesian coordinates gives position, velocity, and acceleration of the hydraulic cylinders which enable the pick-up head to keep the preset optimal distance from seafloor. Inverse dynamic analysis provides the driving forces of hydraulic cylinders and the reaction forces at each joint. Design sensitivity analysis is performed in order to investigate the effects of possible design variables on the change of the maximum strokes of hydraulic cylinders. The direct differentiation method is used to obtain the design sensitivity coefficients.

• 한국정밀공학회지
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• 제15권3호
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• pp.68-74
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• 1998

Performance and efficiency of deep seabed collector is a primary factor for feasibility of commercial deep ocean mining. The efficiency of manganese nodules collector depends on vehicle mobility relative to undulating seafloor and is attributed pickup head to keep altitude and elevation of it against seafloor. For this reason, motion control of pickup head relative to the changing deep-sea topography and other disturbances is of particular importance in design of pickup device. The concept of design axiom is applied to a pickup device of hybrid type in order to evaluate the concept design. Kinematic analysis conducted in absolute Cartesian coordinates gives position, velocity, and acceleration of the hydraulic cylinders which enable the pickup head to keep the preset optimal distance from seafloor. Inverse dynamic analysis provides the driving forces of hydraulic cylinders and the reaction forces at each joint. Design sensitivity analysis is performed in order to investigate the effects of possible design variables on the change of the maximum strokes of hydraulic cylinders. The direct differentiation method is used to obtain the design sensitivity coefficients.

• 대한수의학회지
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• 제24권2호
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• pp.195-199
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• 1984

The present observations were focussed mainly on the macroscopic and histopathological observation to polyps encountered on the stomach of 4-month-old pig, small intestine of 3-month-old pig and cecum of 9-month-old dog. The results were summarized as follows; 1. The polyps were gray or pink hemispherical shapes attached by the broad base to the gastrointestinal walls and were 3 to 8 mm in diameter and diffuse appearance. The surfaces of polyps were flat or indented and were ulcerated in some large polyps. 2. In histopathological findings, the polyps were nodules composed of lymphoid follicles, which were characterized by the differentiation and proliferation of the lymphoid cells in the lamina propria or submucosa of the gastrointestinal tract. The lymphoid nodules have the thin septa and thick capsules of the connective tissues, also comprised more numerous and larger sinus-like-blood vessels and more diffuse lymphoid cells in the peripheral zones than those in the central zones of nodules. In addition, the external surface of the polyps bulged toward the intestinal lumen were covered with the abnormal epithelium, or the degenerative and necrotic lymphocyte aggregates. 3. These polyps were considered as lymphoid polyps caused by the hyperplasia of the lymhoid follicles.

• 한국작물학회지
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• 제23권2호
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• pp.105-112
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• 1978

본 조사연구는 한국재배종 34개품종, 일본재배종 42개품종 및 미국재배종 32개품종등 총 108개품종을 공시하여 근류형성성을 구명하고자 실시하였던 바 그 결과를 요약하면 다음과 같다. 1. 근류형성의 조만은 품종간에 뚜렷한 차리가 있었던 바 파종 14일후에는 근류가 형성되지 않은 품종이 18개품종, 파종 28일후에도 6개품종이나 되었고 특히 42일후에도 미국품종 Flambew는 근류가 형성되지 않았다. 2. 근류수는 품종의 육성모지와 조사시기에 따라 크게 차리가 있었던 바 파종 42일후(3차조사)의 근류수는 일본품종이 26.5개로 가장 많았고 우리나라품종은 19.5개, 미국품종은 15.2개로서 가장 적었다. 3. 주당근류중은 일본품종이 75.9mg로서 가장 무거웠고 한국품종은 71.1mg, 그리고 미국품종은 49.6mg로서 가장 가벼웠다. 4. 근류중과 자실중 및 근류수와는 고도로 유의한 정상관관계가 인정되었으나 기타 몇가지 형질들과는 유의성이 인정되지 않았다.

• Ocean and Polar Research
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• 제27권4호
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• pp.477-490
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• 2005

The development of manganese nodule mining technology is very important in order to secure a long-term and stable supply of rare strategic metals. In the twenty years following the R&D activities with the international consortia in the 1970s, studies on mining technologies have been carried out by several national projects in Korea. The current metal prices such as copper, nickel, cobalt, and manganese have been drastically changed since 2002. Rapid economic growth of Asian countries, especially China, have induced the situation. And the possibility of copper shortage is looming just around the comer. Because of the imbalance between production and consumption, copper is fundamentally the most threatened metal in the future in terms of potential metal shortage. Manganese nodules contain a considerable percentage of copper as the future metal resource. Therefore, it is necessary to concentrate our effects on developing these resources. This paper introduces our evaluation of R&D progress for the development of manganese nodules. The issue and role of manganese nodules during the difficult period of a potential future metal shortage period is discussed and its prospect outlined. Also, this paper tried to emphasize the necessity of continuous R&D efforts for the commercial development of such mineral resources.