• 치과방사선
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• 제25권1호
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• pp.17-25
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• 1995

The purpose of this study was to obtain some informations for the radiographic differential diagnosis between odontogenic keratocyst and unicystic ameloblastoma in the mandible. The author compared and analysed the clinico-radiographic features of 48 cases of odontogenic keratocyst and 32 cases of unicystic ameloblastoma. The obtained results were as follows : 1. Odontogenic keratocyst and unicystic ameloblastoma occurred the most frequently in the 2nd and 3rd decades, and both lesions occurred with slight predilection in males. The most frequent lesional site was molar area in odontogenic keratocyst(50.0％) and mandibular angle and ramus area in unicystic amelobla-stoma(71.9％). 2. Cortical thinning and expansion were observed with similar occurrences in odontogenic keratocyst(77.l％) and in unicystic ameloblastoma(72.9％). 3. Typical undulating lesional border was observed more frequently in odontogenic keratocyst(79.2％) than in unicystic ameloblastoma(46.9％). 4. Well-defined lesional outline occurred more frequently in odontogenic keratocyst(97.9％) than in unicystic ameloblastoma(53.1％). 5. Root resorption of adjacent teeth occurred more frequently in unicystic ameloblastoma(65.2％) than in odontogenic keratocyst(18.8％) respectively, but loss of lamina dura was frequently observed in odontogenic keratocyst(79.2％). And tooth displacement occurred more frequently in odontogenic keratocyst(50.0％) than in unicystic ameloblastoma(17.4％). 6. Displacement of mandibular canal occurred more frequently in odontogenic keratocyst(75.0％) than in unicystic ameloblastoma(61.5％). 7. Inhomogeneous lesional radiolucency occurred more frequently in unicystic ameloblastoma(53.l％) than in odontogenic keratocyst(39.6％).

• Journal of Chest Surgery
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• 제14권2호
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• pp.140-143
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• 1981

Thymolipoma is extremely uncommon benign mediastinal tumor consisting of fatty and thymic tissue. Only 50 verified cases have been reported in the world literatures. This one case is the first reported example of surgically treated thymolipoma associated with spontaneous pneumothorax. A thirty-two year old male patient had been in good health until two days prior to admission, when he noted sudden dyspnea associated with an aching pain over the left precordium. The dyspnea and chest pain had become progressively worse. The physical examination revealed that left hemithorax was tympanic sound on percussion and absence of breathing sound on auscultation and point of maximal impulse was located on the 4th intercostal space at the left sternal border. Emergency closed thoracostomy was performed under the impression of tension type spontaneous pneumothorax of the left lung. After closed thoracostomy, point of maximal impulse was not changed inspire of full expansion of the left lung and chest X-ray was strongly suggested pericardial effusion or cardiomegaly which couldn`t account for by clinical course and hemodynamic evidence. EKG, echocardiogram, bronchofiberoscophy, bronchogram and diagnostic thoracentesis was performed. On Dec. 8, 1980, operation was performed under the impression of mediastinal tumor in the anterior mediastinum. At left posterolateral thoractomy, a large fatty mass, measuring 35 x 27 x 13 Cm in dimension and weighing 3350 gm, was resected and multiple bullae on the apicoposterior segment of the left upper lobe was resected and continuously sutured. The pathologic diagnosis of the fatty mass was thymolipoma. The postoperative course was uneventful and discharged in good general conditions.

• Journal of Chest Surgery
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• 제14권2호
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• pp.135-139
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• 1981

Thymolipoma is extremely uncommon benign mediastinal tumor consisting of fatty and thymic tissue. Only 50 verified cases have been reported in the world literatures. This one case is the first reported example of surgically treated thymolipoma associated with spontaneous pneumothorax. A thirty-two year old male patient had been in good health until two days prior to admission, when he noted sudden dyspnea associated with an aching pain over the left precordium. The dyspnea and chest pain had become progressively worse. The physical examination revealed that left hemithorax was tympanic sound on percussion and absence of breathing sound on auscultation and point of maximal impulse was located on the 4th intercostal space at the left sternal border. Emergency closed thoracostomy was performed under the impression of tension type spontaneous pneumothorax of the left lung. After closed thoracostomy, point of maximal impulse was not changed inspire of full expansion of the left lung and chest X-ray was strongly suggested pericardial effusion or cardiomegaly which couldn`t account for by clinical course and hemodynamic evidence. EKG, echocardiogram, bronchofiberoscophy, bronchogram and diagnostic thoracentesis was performed. On Dec. 8, 1980, operation was performed under the impression of mediastinal tumor in the anterior mediastinum. At left posterolateral thoractomy, a large fatty mass, measuring 35 x 27 x 13 Cm in dimension and weighing 3350 gm, was resected and multiple bullae on the apicoposterior segment of the left upper lobe was resected and continuously sutured. The pathologic diagnosis of the fatty mass was thymolipoma. The postoperative course was uneventful and discharged in good general conditions.

• Imaging Science in Dentistry
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• 제52권2호
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• pp.123-131
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• 2022

Purpose: The aim of this study was to characterize the cone-beam computed tomographic (CBCT) imaging features of central giant cell granuloma (CGCG) of the jawbone. Materials and Methods: This study retrospectively reviewed 26 CBCT studies of histologically proven cases of CGCG during a period of 20 years, from 1999 to 2019. Patients' demographic data were recorded, and radiographic features were assessed (location, border, cortication, appearance of the internal structure, locularity, septation, expansion, cortical perforation, effects on surrounding tissue, whether the lesion crossed the midline, and lesion volume). Results: In this study, CGCGs were seen almost twice as often in the mandible than in the maxilla, and 64.7% of mandibular lesions involved the anterior region. Only 26.9% of lesions crossed the midline, a feature that was considered characteristic of CGCG. Furthermore, 65.4% of lesions were unilocular and 34.6% were multilocular. The correlation between a lesion's size and its locularity was statistically significant, and larger lesions showed a multilocular appearance. The mean volume of multilocular lesions was greater than that of unilocular lesions. Conclusion: CGCGs showed variable radiographic features on CBCT, and this imaging modality is highly effective at demonstrating the radiographic spectrum and lesional extent of CGCGs in the jawbone.

• 천문학회보
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• 제45권1호
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• pp.51.1-51.1
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• 2020

The Rosette Nebula is the most actively star-forming region in the Monoceros OB2 association. This region hosts more than three stellar groups, including the most populous group NGC 2244 at the center of the region and the smaller stellar groups around the border of the H II bubble. To trace their formation process, we investigate the kinematic properties of these groups using the Gaia astrometric data and high-resolution spectra taken from observation with Hectochelle on MMT. The proper motions of stars in NGC 2244 show a pattern of radial expansion. The signature of cluster rotation is also detected from their radial velocities. On the other hand, the small groups appear to be physically associated with some clouds at the ridge of the H II region. Among them, the group near the eastern pillar-like gas structure shows the signature of feedback-driven star formation. In this presentation, we will further discuss the formation process and dynamical evolution of the stellar groups in the Rosette Nebula, based on the observation and results of N-body simulations.

• Imaging Science in Dentistry
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• 제32권3호
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• pp.167-173
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• 2002

Purpose : To evaluate clinical and radiographic differential diagnosis between ameloblastoma and odontogenic keratocyst (OKC) using clinical data, plain radiographs, and CT. Materials and Methods: 25 cases of ameloblastoma and 44 cases of OKC diagnosed in biopsy, were selected from the files stored in Department of Oral and Maxillofacial Radiology, Seoul National University Dental Hospital from 1999 to 2001, and evaluated using following criteria: sex and age, location, shape, border to normal bone tissue, effect to adjacent tissues, homogeneity in the lumen of the lesion, response of the cortical bone, long-to-short length (LIS) ratio of the lesion, and expansion angle of the cortex. Results: Ameloblastoma and OKC were seen most frequently in third decades and no statistical significance was noted between both sexes. Ameloblastoma occurred most frequently in mandibular angle and ramus area (68%) and OKC at the maxillary molar (34.1 %), and mandibular angle and ramus area (43.2%). The root resorption of the adjacent teeth, mandibular canal displacement, and the impaction of teeth were seen more frequently in ameloblastoma than in OKC. The LIS ratio measured in CT was largest in maxillary OKC cases, followed by mandibular ameloblastoma, and mandibular OKC (1.2, 1.8 and 2.4 respectively). The expansion angle of the cortex shows a statistically significant difference between ameloblastoma (48.8°) and OKC (31.5°). Conclusion : The numeric morphology (LIS ratio) and expansion angle of the cortical bone of the lesion measured in computed tomography can be used to differentiate the ameloblastoma and odontogenic keratocyst.

• 대중서사연구
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• 제26권2호
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• pp.251-276
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• 2020

이 서평논문의 목적은 『유럽과 북미 지역 접경지대 연구의 세계화(Globalizing Borderlands Studies in Europe and North America』를 비판적으로 읽음으로써 현재까지 유럽과 북미 지역에서 진행된 접경지대 연구의 동향을 살피고 그 서사의 확장 가능성과 한계를 논하는 데 있다. 이 책은 고대에서 현대까지 유럽과 북미 지역의 접경지대들을 대상으로 한 다양한 사례연구들을 소개한다. 공동연구의 목적과 정의를 명확히 하기 위한 서론 챕터와 접경연구의 미래에 대한 전망을 다룬 짧은 결론 챕터 외에 총 10개 챕터로 구성된다. 이 챕터들은 크게 두 가지 측면에서 현 접경연구에 중요한 시사점을 던져준다. 첫째, 이제껏 접경연구를 선도해온 유럽과 북미(대개 미국) 학계의 연구자들이 관심을 기울인 지역과 대상들에 대해 알 수 있게 해준다. 그렇게 접경연구의 현주소를 점검하고 축적된 성과들을 발판으로 다른 지역(특히 아시아)에 존재하는 다양한 접경지대에 대한 연구가 가능할 것인지, 소위 세계화라는 연구의 확장 가능성 또한 전망한다. 둘째, '접경지대'라고 하면 일반적으로 떠올리게 되는 물리적(physical)인 공간으로서의 접경지대를 넘어, 개념적(conceptual)인 공간으로서의 접경지대를 소개한다. '개념적 접경지대'의 사례는 한 개인의 정체성에서부터 통치 방식, 종교, 경제, 사회제도, 가족, 노동, 공중보건, 젠더 문제에 이르기까지 매우 다양하다. 그러나 한계점 역시 존재한다. 공동연구의 한계라고 할 수 있는 일관된 용어 사용의 부재, 유럽과 북미 지역이라는 배경적 한계 때문인지 여전히 제국주의 담론 내에서 접경지대를 이해하려 한다는 점, 따라서 여기서 그리고 있는 접경지대의 대부분이 갈등과 투쟁의 공간에서 벗어나지 못했다는 점 등이다. 그럼에도, 이 책은 여러 접경연구의 가능성을 제시했다는 점과 지정학적으로 대륙세력과 해양세력의 접경지대에 위치한 한반도의 현 상황을 이해하는데 도움을 준다는 점에서 현재적인 의의가 있다.

• 한국패류학회지
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• 제27권3호
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• pp.181-190
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• 2011

본 연구는 백합과 이매패류인 바지락, Ruditapes philippinarum을 노닐페놀에 노출시켰을 때, 생식 및 조직학적 지표 변화에 대해서 조사하였다. 실험기간은 16주였다. 실험구는 1개의 대조구와 3개의 노닐페놀 노출구인 0.05, 0.1, $0.2 mg\;NP\;L^{-1}$였다. 생식소지수는 암컷의 경우, 대조구보다 노출구에서 더 높았으며, 수컷의 경우, 대조구보다 노출구에서 더 낮았다. 이성생식세포 발현율은 14.56%였으며, 수컷에서의 발현율이 더 높았다. 기관계 가운데 외투막에서 혈림프동의 확장, 내부상피층 자유면에 발달하는 선조연의 탈락과 박리, 점액세포의 변성이 관찰되었다. 아가미에서는 정단섬모와 측면섬모의 부분적 소실, interlamella junction 붕괴, 점액세포의 변성이 확인되었다. 발에서는 상피세포의 증식, 선조연의 소실 및 섬모가 탈락되었다. 지방갈색소 축적은 노닐페놀에 농도 의존적으로 높았다. 본 연구결과 노닐페놀은 바지락의 낮은 생존율과 조직병리학적 변화 및 이성생식세포 발현을 유도하며, 더욱이 생식과 관련하여 estrogenic effector로서 가능성을 확인하였다.

• 환경정책연구
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• 제8권3호
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• pp.1-26
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• 2009

본 연구는 실질적인 동북아 생태네트워크 구축을 위한 추진 방안을 마련하기 위하여 이론적 모형을 제시하였고, 위성영상자료를 분석하여 체계적인 동북아 생태네트워크 분석 및 검증을 수행하였으며, 이를 바탕으로 동북아 생태네트워크 추진방안에 대한 정책적 사항을 제안하였다. 동북아 생태네트워크 분석 결과 한반도의 경우 일부 분산된 핵심지역들이 분포하고 있으며, 중국은 동불 3성 일부에만 핵심지역이 존재하였다. 극동 러시아의 경우 대부분이 핵심지역에 속하며 종에 대한 안정적 서식처로 활용될 수 있을 것이다. 몽골의 경우 중국 동북 3성 지역과 연계되어 핵심지역이 존재하는 것으로 파악되었다. 본 연구에서 제안한 방안은 국가 수준을 넘어서는 생태네트워크의 개념을 동북아지역에 도입하기 위한 방안을 모색하기 위한 연구라고 할 수 있다. 또한 국가 수준을 넘어서는 국제 생태네트워크 구축 및 동북아 생태네트워크 구축을 위한 사례 검증을 제시하였으며, 향후 실제 추진과정에 있어 가이드라인으로 기능할 수 있도록 하였다. 앞으로 시계열 위성영상 및 환경관련 공간정보가 보다 많이 확보된다면 동북아 전체의 토지피복 및 식생에 대한 변화를 분석할 수 있으며, 동북아 생태네트워크 분석 및 구축에 보다 용이할 것이다.

• Environmental Analysis Health and Toxicology
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• 제21권2호
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• pp.115-126
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• 2006

This study was conducted to find out survival rate, activity, growth and change of the organ structure of bivalves exposed to heavy metal. The results of the study confirmed that zinc (Zn) induces reduction of survival rate and activity, abnormality of organ structure of the equilateral venus, Gomphina veneriformis. Experimental groups were composed of one control condition and three Zn exposure conditions ($0.64mg\;Zn{\iota}^{1},\;1.07mg\;Zn{\iota}^{-1},\;1.79mg\;Zn{\iota}^{-1}$). As the concentration of zinc increased the accumulation of lipofucin increased in the digestive gland. Survival rate was the lowest in the lowest Zn exposure group at $0.64mg;Zn{\iota}^{-1}$. Growth was not significantly different between the control and exposure group. Activity. with the exception of the lowest Zn exposure group at $0.64mg\;Zn{\iota}^{-1}$, was similar between the control and exposure group. Histological analysis of organ system illustrated expansion of hemolymph sinus, loss of striated border of inner epidermis, increase in the number of mucous cell in the mantle. Also, histological degenerations as epithelial necrosis and hyperplasia of mucous cells are recognized in the gill and foot.