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非星相刑 集合에서의 非擴張的인 寫像의 固定點들에 관한 硏究
이용녹,趙玟亨 金烏工科大學校 1990 論文集 Vol.11 No.-
본 연구에서 우리는 starshaped set이 포함되는 족(family)에서의 복소선형공간 안에 있는 새로운 부분집합류를 소개하고 몇 가지 일반화된 고정점정리를 얻어내었다.
TMS320C80을 이용한 Template Matching Algorithm의 구현
趙敏亨 수원대학교 산업기술연구소 1998 산업기술연구소논문집 Vol.13 No.-
For an advanced manufacturing system the automations of the assembly and inspection of products are necessary and an image recognition system is required. In this paper, the high performance vision system using parallel digital signal processor, TMS320C80 is presented and the related S/W algorithm is described. In particular, the widely-used template matching algorithm which required a big computing power was newly developed and its optimal codes were implemented. The developed algorithm shows the high computation efficiency for TMS320C80. It has some advantages that the template size is unlimited and the accurate correlation can be obtained.
趙敏亨 수원대학교 산업기술연구소 1993 산업기술연구소논문집 Vol.8 No.-
The effect of diffusion on a NMR image in magnetic gradient field was investigated by the Monte Carlo simulation. A NMR image is composed of domains where the imaging parameters such as a nuclear density, physical or chemical properties are homogeneous. Since molecular diffusion in a domain is limited by the domain boundary, the effect of diffusion on a NMR image is very different from the previous predictions based on the free diffusion in an infinite space. The simulation result shows that diffusion effect is not the main obstacle to the submicron NMR microscopic imaging. In the presence of diffusion, the intensity of an image signal gets bigger as approaching a boundary until it reaches its maximum value. After that, the intensity keeps decreasing until it reaches 20% of normal value at the boundary, and penetrates into a neighboring domain a little bit. This result indicates that the boundary blurring is negligible contrary to the previous works. The amount of distortion of an image is almost independent of the manitude of magnetic field gradient and increasing diffusion coefficient.
조민형,정현주,한재호,박준은 대한소아혈액종양학회 2019 Clinical Pediatric Hematology-Oncology Vol.26 No.2
Sinus histiocytosis with massive lymphadenopathy, also known as Rosai-Dorfman disease (RDD), is a rare histiocytic disorder of unknown etiology. Most patients with RDD have spontaneous remission, but in some patients, the disease recurs after complete remission and may not respond to general treatment. Some patients with RDD involving the extranodal system can have serious symptoms such as vital organ dysfunction due to mass effects, neurological symptoms caused by intracranial involvement, and respiratory distress with airway involvement. We report the case of a 7-year-old girl with severe dyspnea due to refractory extranodal RDD that caused progressive upper airway obstruction. She was admitted because of nasal congestion and persistent cervical lymphadenopathy, and diagnosed as having RDD by cervical lymph node incisional biopsy. The initial prednisone treatment did not improve her symptoms. The following contrast-enhanced neck computed tomography revealed a newly developed airway mass protruding in the upper trachea. After 8 weeks of chemotherapy with vinblastine, methotrexate, and prednisone, complete remission was attained. Seven months after chemotherapy cessation, the disease recurred, and chemotherapy with vincristine, cytarabine, and prednisone was resumed. Despite the chemotherapy and emergency radiotherapy, no improvement was observed in the cervical lymph node enlargement and airway obstructive symptom due to the upper tracheal mass. 2-Chlorodeoxyadenosine (cladribine) therapy was initiated, and the patient got complete remission after 6 cycles of the cladribine treatment and maintained no evidence of disease for 2 years. We suggest that cladribine is an effective treatment option for recurrent/refractory RDD.
Toothpick Colon Injury Mimicking Colonic Diverticulitis
조민형,남궁환 대한대장항문학회 2018 Annals of Coloproctolgy Vol.34 No.3
Although toothpick ingestion is rare, it can lead to fatal complications in the gastrointestinal tract. Diagnosing toothpick ingestion is difficult because most patients do not recall swallowing one. We report 2 cases of toothpick-ingestion-induced colon injury, mimicking diverticulitis. The first patient was a 47-year-old male who had received conservative treatment under the impression of his having diverticulitis in the cecum. Ultrasonography revealed a linear foreign body in the right lower abdomen; a subsequent laparoscopic examination revealed inflammation around the cecum, but no evidence of bowel perforation. A thorough investigation revealed a toothpick embedded in the subcutaneous fat and muscle layer of the lower abdominal wall; we removed it. The second patient was a 56-year-old male who had received conservative treatment under the impression of his having diverticulitis in the sigmoid colon. An explorative laparotomy revealed a toothpick piercing the sigmoid colon; we performed an anterior resection. Both patients were discharged without postoperative complications.
범용 DSP SSP1600을 이용한 MPEG Huffman decoder의 구현
趙敏亨 수원대학교 산업기술연구소 1992 산업기술연구소논문집 Vol.7 No.-
Many video compression and decompression systems require a high-speed implementation of variable-length (Huffman) coder and decoder. In this paper, MPEG Huffman decoder using a general purpose digital signal processor is implemented and its performance is analyzed. The method to use a general purpose DSP has some advantages. First, its programmability can support various algorithms such as JPEG, MPEG, and H. 261. Second, its development cost is low and the addition of extra logic for ASIC is easy. This paper analyzes the performance of SSP1600 for MPEG Huffman decoder and proposes the design of extra logic to improve its throughput.