움직임탐색에 있어서 DCT를 이용한 탐색점 배치

송지연(Ji-Youn Song),김준한(Jun-Han Kim),김상곤(Sang-Gon Kim),윤영우(Young-Woo Yoon) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅱ

블록의 DCT계수를 이용하여 동영상 움직임 탐색(motion estimation0에서 탐색점 수를 결정하는 선택적 탐색 기법을 제안한다. DCT(Discrete Cosine Transform)연산과 블록정합 기법인 3단계 탐색기법을 기반으로 한다. DCT연산 결과인 블록의 주파수성분에 가중치테이블을 적용하여 고주파성분을 많이 가진 블록일수록 탐색점의 수를 증가시켜 국부극소에 빠질 확률을 줄여 화질을 개선한다. MP@ML 영상 데이터에 대해 제안된 기법을 사용하여 시뮬레이션하였다. 제안하는 기법은 3단계 탐색기법에 비하여 연산량은 증가하나, 연산량 증가에 비하여 좋은 화질을 제공한다.

다형홍반양 병변을 동반한 급성 전신성 발진성 농포증

양진석 ( Jin Seok Yang ),이정훈 ( Jung Hoon Lee ),송지연 ( Ji Youn Song ),김태윤 ( Tae Yoon Kim ),이준영 ( Jun Young Lee ) 대한피부과학회 2003 대한피부과학회지 Vol.41 No.5

Acute generalized exanthematous pustulosis(AGEP) is a disease entity caused mostly by drugs or viral infections. Clinically, it manifests as generalized erythema and tiny pustules with fever, but may manifest targetoid lesions, purpura, edema, blisters and mucosal erosions in addition to pustules. We describe a case of AGEP with erythema multiforme-like features in a 46 year old woman who presented with acute onset of high fever and a noticeably polymorphic eruption consisting of numerous tiny pustules on erythematous bases, edematous targetoid lesions and purpuric lesions. The histology revealed subcorneal neutrophilic pustules on the tiny pustular lesions and markedly papillary dermal edema on the erythema multiforme-like lesions. Systemic corticosteroid and antihistamines were initiated, resulting in rapid resolution without recurrence. (Korean J Dermatol 2003;41(5) : 630~633)

림프종 환자에서 발생한 선단형 흑색 극세포증 1예

송지연,임지현,김형옥,김정원 대한피부과학회 2002 대한피부과학회지 Vol.40 No.7

Acanthosis nigricans is a symmetric eruption characterized by a hyperpigmented, velvety cutaneous thickening that can develop on any part of the body, but characteristically affects the flexural area of the body. But many dark-skinned people have velvety hyperkeratosis of the dorsum of the hands and feet, a variant of acanthosis nigricans called acral acanthotic anomaly or acral type acanthosis nigricans. Malignant acanthosis nigricans is associated with a malignant tumor-most commonly an abdominal, and particularly a gastric carcinoma. To our knowledge, this is the first report of acral type acanthosis nigricans associated with non-Hodgkin"s lymphoma.

외음부에 발생한 Bowen병 1예

송지연,명재욱,임진수,박철종,김시용 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.1

Bowen's disease was originally described by Bowen in 1912 and is believed to be a squamous cell carcinoma in situ. It develops on any part of the .3kin surfaces or mucous membranes. But the lesions on the vulvar region are relatively ran. The gross appearance of vulvar lesion, which shows erosion, ulceration or pigmentation, is different from that of typical Bowen's disease. We, herein, report a case of Bowen's disease arising on a vulvar region with a review of the literature.(Korean j Dermatol 2003:41(1) : 112∼115)

신장 이식 후 면역억제제 투여 중 발생한 한공각화증 1예

송지연,김형옥,김정원 대한피부과학회 2002 대한피부과학회지 Vol.40 No.2

We report a case of a 55-year-old male renal transplant patient, who showed 1 cm sized six round brownish macules on both arms and legs for 8 months. These lesions were stable without change in size or number and histopathologically were consistent with the finding of porokeratosis. We think that this lesion is the mixed type which shares the character of Mibelli's porokeratosis and disseminated superficial actinic porokeratosis.

해바라기(Helianthus annus L.) 배양세포의 Cellular Peroxidase 활성을 억제하는 비병원성 Elicitor의 확인

송지연,신광숙,이인철 대전대학교 기초과학연구소 1999 自然科學 Vol.10 No.2

효모(Sacharomyces cerevisiae)의 세포벽 성분은 가장 잘 알려진 nonpathogenic elicitor이다. 이런 종류의 elicitor가 식물세포의 생리적 변화를 유도하는 기작을 규명하기 위하여 해바라기(Helianthus annus L.)의 배양 세포에 투여한 후 peroxidase 활성 변화를 측정하였다. 선행된 실험에서 보여주는 바 장미나 담배의 배양세포에서 yeast-elicitor는 peroxidase 의 활성, 특히 extracellular peroxidase 의 활성을 증가시켰으며, 기존의 peroxidase 와 구분되는 isoperoxidase 의 de novo synthesis를 유도한다는 증거를 얻은 바 있다. 그러나 해바라기 배양세포에서는 동일한 eliciting에 대하여 extracellular peroxidase의 활성변화는 관찰되지 않았으며 cellular peroxidase가 오히려 감소되는 결과를 얻었다. 효모 세포벽 성분을 DEAE-cellulose, CM-sepharose 및 concanavalin A-sepharose chromatography를 통하여 분획한 결과 DEAE-celluose로부터 용출된 분획과 concanavalin A로부터 용출된 분획이 peroxidase 의 활성을 억제하였으며 이러한 억제는 시료를 투석하여 glucan의 농도가 감소하는 것에 비례적으로 감소하였다. 그러므로 상기와 같은 반응을 유도하는 성분은 oligosaccharides라고 판단되었다. 이러한 결과는 동일한 elicitor에 대하여 식물의 종에 따라 반응하는 양식이 다름을 보여주는 결과라고 생각된다. Cell wall components of yeast (Sacharomyces cerevisiae) is well known nonpathogenic elicitor in some plant. To identify the chemical properties of yeast elicitor, the elicitor was isolated by ethanol precipitation followed by DEAE-cellulose, CM-sepharose and concanavalin A-sepharose chromatography. In contrast to the effect of elicitor in cultured cells of rose or tobacco, same elicitor from yeast has been found to suppress the peroxidase activity in cultured sunflower(Helianthus annus L.) cells. The inhibitory elicitor on peroxidase activity was detected in fractions eluted from DEAE-cellulose and from concanavalin A-sepharose column. The inhibitory effect of DEAE-fraction, however, was decreased by dialysis against distilled water using dialysis tubing with molecular cut off 1,000 Da. which suggested the yeast elicitor might be a oligosacharide. These results showed that plant might respond in different physiological ways to the same elicitor according to the plant species.

조갑 주위에 발생한 육아조직 2예

송지연,임지현,이정훈,김태윤,이준영 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.8

Granulation tissues may arise around the nail in response to trauma to the nail or to ingrowing nails. Drugs, such as retinoids or antiviral agents may be the cause of granulation tissue of the whole body or nails. We experienced two cases of granulation tissue developed on the proximal nail folds and subungual area after putting on tight cast and Korean traditional socks respectively. We reported the cases with review of the literature. (Korean J Dermatol 2003;41(8) : 1088~1090)

원발성 피부 CD30 음성 대형 T세포 림프종 1예

송지연,양진석,김미연,박영민,김형옥,박경신,강창석 대한피부과학회 2003 대한피부과학회지 Vol.41 No.10

Primary CD30 negative large T cell lymphomas consist of CD30 negative large tumor cells without prior or concurrent mycosis fungoides. Clinically, it presents with solitary, localized or generalized plaques, nodules, or tumors and most cases show an aggressive clinical course. The histologic apperance may be identical to that of classic mycosis fungoides undergoing transformation into large cell lymphoma and large tumor cells represent at least 30 percent of the total tumor cell population. We experienced a case of CD30 negative large T cell lymphoma and report it with a review of literatures.(Korean J Dermaton 2003;41(10) : 1402~1405)

모낭선종 1예

이정훈,송지연,임지현,김태윤,이준영 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.7

Trichoadenoma is a rare benign tumor and it appears as a solitary tumor on the face and buttock. Histologically, it is characterized by numerous horny cysts lined with stratified squamous epithelium and solid epithelial tumor nests. This tumor is less mature than trichofolliculoma and more differentiated than trichoepithelioma, and it is considered as a tumor with differentiation toward the infundibular portion of the pilosebaceous canal. A 39-year-old woman presented with asymptomatic, solitary, 1.5×1.5 cm sized, pedunculated mass on her buttock for 2 years. Histopathologic examination showed characteristic features of trichoadenoma. Trichoadenoma is so rare that only 3 cases have been reported in the Korean literature. (Korean J Dermatol 2003;41(7) : 962~964)

두피 손상 후에 발생한 Tufted Hair Folliculitis 1예

이정훈,송지연,임지현,김태윤,이준영 대한피부과학회 2003 大韓皮膚科學會誌 Vol.41 No.9

Tufted hair folliculitis is a progressive, recurrent and inflammatory disease of the scalp characterized by a tufted appearance of the hairs and may result in permanent scarring alopecia. A 41-year-old man presented with tufted hairs within a 3×4cm sized indurated cicatrical patch which is getting wider. He had a scalp laceration history to the lesion 1 year ago. Histopathologic findings showed widened follicular infundibulum, dense perifollicular inflammatory cell infiltrations and dermal fibrosis. We report a case of tufted hair folliculitis developed secondarily to the scalp injury. (Korean J Dermatol 2003;41(9) : 1256~1258)