• The Journal of Korean Academy of Prosthodontics
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• v.58 no.1
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• pp.23-29
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• 2020

Purpose: The purpose of this retrospective study was to evaluate the method using the S-reamer and gel-type graft material by the success rate and survival rate. Materials and methods: Implantation period was from 2008 to 2014, Follow check up year is 2019. There were 59 patients and 117 implants. All implants were placed in the posterior maxilla with the sinus lift. The patients population consisted of 34 men and 25 women, ranging from 19 to 75 years. The residual bone heights were from 1 mm to 6 mm. Sinus was perforated with S-reamer without membrane tearing and gel type bone graft material was used for membrane lifting and filling the space. all implants were placed simultaneously. Panoramic X-ray was taken. After 5 - 6 months healing period, final prostheses were restored. After more 5-years implant surgery, Panoramic X-ray was obtained and X-ray analysis and clinical examination were performed. Success criteria was referred to a Buser's success critera. All implants were classified to success implant, survival implant, failed implant. A success implant was satisfying success criteria, a survival implant was a implant that was acute infection with suppuration and bone loss, a failed implant was a implant that was mobile, removed. Results: Five implants were removed, and 4 implants had infected with bone loss. Survival rate was 95.7% and success rate was 92.3%. Conclusion: This retrospective study presented that this method with S-reamer and gel-type graft material was a successful treatment without membrane tear in the condition of 1-6 mm residual bone height.

• Clinical and Experimental Pediatrics
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• v.51 no.11
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• pp.1211-1216
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• 2008

Purpose : Diamond-Blackfan anemia (DBA) is a rare heterogeneous genetic disorder of infancy and early childhood. It is characterized by red cell aplasia, congenital anomalies, and a predisposition to cancer. Corticosteroids and red cell transfusions are the mainstays of therapy. We describe our experience of 6 cases of DBA that were encountered over a period of 16 years. Methods : Medical records of 6 patients diagnosed to have DBA and admitted to the Chonnam National University Hospital between 1992 and 2008 were retrospectively reviewed. Results : Three patients were males. The age at diagnosis ranged from 3 to 18 months (median, 5.5 months). Heart defects were observed in 4, polydactyly in 2, and strabismus in 1 patient. The median number of transfusions was 3 (range, 2-8). All patients responded to initial treatment with steroids and had a hemoglobin level ${\geq}9g/dL$ with a median of 12.5 days (range, 7-22 days). Three patients are currently not receiving steroid therapy. A minimum dose of oral prednisolone (<5 mg per day) was required to maintain hemoglobin ${\geq}9mg/dL$ in 3 cases. Red cell transfusion was infrequently required in 1 patient. In the median follow-up of 14 years, there was no development of malignancy. No significant side effects of steroids were found, except for short stature in 2. Conclusion : The majority of DBA patients achieved complete response and under maintenance therapy with low dose of steroids. Close observation is needed to monitor steroid side effects, cardiac function, and development of malignancy. A nation-wide survey is necessary to further characterize this rare disease in Korean children.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.91-92
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• 2007

사용자의 행동 모니터링에 대한 이전의 기술적인 연구는 네트워크 트래픽과 데이터베이스 접근 형태에 집중되어 왔다. 이전의 연구는 자료를 공유하고 교환하는 것 같은 사용자들 사이의 상호작용을 관찰하는 부분에 있어서는 부족하다. 즉, 사용자와 사용자의 행동 정보를 수집하고 그 자료에 바탕을 두고 상호작용을 시각적으로 관찰할 수 있어야 한다. 따라서 수집된 자료의 좀 더 분석적인 관찰을 위해서 지금까지의 개발되고 사용된 여러 가지 컴포넌트를 사용하여 이 같은 상호작용을 여러 가지 형태의 그래프로 표현할 수 있는 그래픽 툴을 개발한다.

• Advances in pediatric surgery
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• v.18 no.1
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• pp.1-11
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• 2012

담관 낭종은 흔하지는 않지만, 외과적 절제가 필요한 주요 질환이다. 절제하지 않고 남겨두면 다른 질환으로의 이환이나 다양한 합병증에 의한 사망까지도 야기할 수 있기 때문에 적절한 수술적 치료가 필수적이다. 최근 수술에 따른 다양한 문제들이 계속 보고되고 있으며, 출생 전이나 건강 검진 시 발견되는 무증상의 담관 낭종의 수술 시기에 대해서도 아직 논란이 되고 있다. 저자들은 1995년부터 2009년까지 담관 낭종으로 수술 받은 환자 중 수술 받을 당시의 연령이 18세 이하인 32명 환자의 임상 양상과 수술 기록을 후향적으로 분석하여, 수술 성적에 영향을 주는 요인들을 알아보고자 하였다. 전체 32명 중 남자 10명, 여자 22명이었으며, 수술 당시의 평균 연령은 5.4세였다. 췌담관 합류이상은 9명(28.1%)이었으며, 평균 추적 관찰 기간은 34.6개월이었다. 술 전 증상을 호소한 환자는 30명(93.8%)이었으며, 복통(63.3%), 황달(40.0%), 구토(23.3%), 복부종물(16.7%), 발열(16.7%)등의 순서였다. 술 전 혈액 검사에서 AST/ALT의 상승이 18명(56.3%), 고빌리루빈혈증이 8명, 백혈구 증가증이 7명(21.9%)이었다. 술 후 합병증은 5명(15.6%)에서 나타났는데, 2명은 담관염이었고, 나머지 3명은 문합부 협착, 술 후 출혈, 장 폐쇄가 각각 1명 있었다. 술 후 평균 재원 기간은 12.2일 이었으며, 추적 관찰 기간 중 3명(9.0%)이 재입원 하였다. 수술 성적에 영향을 미치는 요인으로, 수술 당시의 나이가 많을수록 평균 수술 시간과 재원 기간이 증가하였다(p=0.004, p=0.028). 증상이 있었던 환자군에서 무증상 환자군보다 재원 기간이 더 길었다(p=0.001). 또한 췌담관 합류이상이 있었던 환자군에서 재입원율이 유의하게 높았다(p=0.005). 소아의 담관 낭종은 진단이 되면 증상 발현 전이라도 조기에 수술하는 것이 수술 시간 및 재원 기간을 단축시킬 수 있으며, 췌담관 합류이상이 동반된 경우에는 술 후에 재입원할 가능성이 높으므로 주의깊게 추적 관찰하는 것이 바람직할 것이다.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3007-3009
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• 1999

정보와 시대인 요즘 컴퓨터의 사용이 갈수록 증가하면서 사용의 편이를 높이기 위하여 사람과 컴퓨터간의 인터페이스에 대한 연구가 많아지고 있다. 새로운 형태의 인터페이스는 자연적인 사람의 행동 양식을 분석하여 그 정보로부터 사용자의 의도를 추출해내는 의도 파악(Intention reading)에 기반한 형태이다. 우리가 관심을 두고 있는 시스템은 사용자가 바라보고 있는 방향을 추적하여 그 방향을 이용하여 컴퓨터를 조작하는 시스템이다. 응시방향을 알아내기 위해 카메라를 이용하여 눈의 움직임을 관찰한다. 그리고 얼굴의 움직임이 있는 일반적인 경우 정확한 눈의 응시 방향을 결정하기 위해서 눈에 대한 정보만을 이용하지 않고 얼굴이 향하고 있는 방향을 추정하여 더 일반적이고 정확한 눈의 응시방향을 결정고자 한다. 본 논문에서는 기존의 눈 응시 방향 추적 방법들에 대하여 소개하고 우리가 개발하려고 하는 시스템에 대해 언급하고자 한다.

• The Journal of Korean Institute of Next Generation Computing
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• v.13 no.4
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• pp.112-123
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• 2017

Research for the inverse estimation of RF threats and the efficient electronic attack based on the parameters of the electronic information has been active in the electronic warfare (EW) situations. In this paper, an EW transmission simulator is constructed from the modeling of radar threats, EW receivers, and propagation environments with the collected electronic information in order to verify the performance of the inverse estimation algorithm in various and practical EW situations. In simulation results, we show that the range tracking error and angle tracking error are produced within ten meters and one degree, respectively. And also, we show that the changing relations between the angle tracking error and the parameters of the monopulse angle tracking radar such as the beamwidth and squint angle in simulation results correspond with those in the theoretical modeling. Accordingly, the constructed EW simulator can be used to observe the modifying characteristics of the electronic information in transmission environments, and then, to evaluate the performance of the inverse estimation system in various EW situations.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.978-979
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• 2015

스마트 러닝을 위한 다양한 시도가 있으나, 프로그래밍과 같이 예제나 흐름에 관한 설명이 중요한 경우, 학습자의 학습결과로 주어진 문제 풀이가 올바른 답이라 할지라도 앞 뒤 맥락에 따른 이해를 하고 있는 가는 학습태도를 관찰함으로써 보다 긍정적인 학습효과를 얻을 수 있다. 본 연구는, 학습자의 학습결과와 학습태도를 관찰하여 이를 학습자 개인성향과 보다 나은 학습 활동에 지침이 되도록 하는 것을 목표로 한다. 학습태도는 학습콘텐츠 제공자에 의해서 주어진 학습패턴과 학습자의 학습패턴을 시선 추적을 통해서 측정하고, 두 패턴 사이의 차이를 비교하여 태도의 집중도와 일관성을 관찰하고자 한다.

• Childhood Kidney Diseases
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• v.4 no.1
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• pp.63-68
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• 2000

Purpose: MCDK is regarded as a common cause of abdominal masses in children. And the presentation of the MCDK is usually a unilateral flank mass in the a newborn. Bialteral disease results in either fetal demise or necessity fer renal replacement therapy at birth. This study is designed to assess the clinical features and natural history of the unilateral multicystic dysplastic kidney. Patients and Methods: From January 1987 to January 2000 data were obtained retrospectively on 57 patients (28 boys and 29 girls, age ranged 1day-11years) who had a diagnosis of multicystic dysplastic kidney. The diagnosis of multicystic dysplastic kidney was confirmed by a combination of ultrasonography and radionuclide scan. Voiding cystourethrogram study in 31 patients were done to determine the condition of the contalateral kidney. Restllts: $84\%$ of the patients were diagnosed before birth by antenatal ultrasonography Clinical manifestations of children with postnatal diagnoses were palpable abdominal mass($3.5\%$), abdominal distension($17\%$), and incidental($10.5\%$). The abnormalities in contralateral kidney were hydronephrosis($21\%$), compensatory hypertrophy($12\%$), simple cyst($2\%$), bifid pelvis($2\%$). Surgical management was performed in 20 patients($35\%$) due to recurrent infection, for diagnostic purpose to differentiate from malignancy and abdominal distention. Follow-up in the remaining 37 patients continued (mean 18 months) and results of sonogram findings were involution change in 23 patients($40\%$) and no interval changes in 13 patient($23\%$). Conclusions : The apparent tendency to regression of the dysplastic kidney and no difference in the number of complications justify a conservative management rather than operative intervention except in associated severe complications such as urinary tract infection or rupture of cysts.

• Journal of Chest Surgery
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• v.41 no.5
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• pp.625-629
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• 2008

Background: When it comes to esophageal cancer operations, the prevalence of anastomotic complications that adversely affect quality of life is related to the type of anastomotic procedure and the operative site. We studied outcomes related to a safe anastomotic method used in Ivor Lewis esophagogastrectomy for preventing anastomotic leakage and stricture formation. Material and Method: Between May 2003 and April 2007, 18 patients with esophageal cancer underwent this type of esophagogastrectomy. Four people were lost to follow-up. There were 17 men (94.4%) and 1 woman. The mean patient age was 61 years (range, $46{\sim}73$ years). Result: The mean follow-up period was 17.2 months (range, $1{\sim}45$ months). There was no anastomotic leakage. There was one benign anastomotic stricture (5.6%) requiring esophageal balloon dilatation, which was accomplished with a 25 mm circular stapler. Conclusion: We experienced relatively good postoperative results using a safe anastomotic method in the Ivor lewis operation for preventing anastomotic complications. These results suggest that this anastomotic method is effective in reducing the incidence of benign anastomotic complications.

• Neonatal Medicine
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• v.15 no.1
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• pp.75-79
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• 2008

Purpose : There are many causes of hematochezia in neonates and during early infancy. Cow's milk allergy is considered to be the most common cause of bloody stools in infants; however, cow's milk allergy is diagnosed in relatively few patients. In a significant proportion of case investigations, the etiology of hematochezia is not determined. The objectives of this study were to evaluate the clinical course and prognosis of patients with hematochezia of unknown etiology. Methods : The patients were <4-month-old infants with hematochezia in whom infectious and surgical etiologies had been excluded. We investigate retrospectively the clinical course and laboratory finding. We also perform 2-years follow-up study and evaluate prognosis of the patients. Results : In all study patients, RAST milk was negative. All patients had self-limited hematochezia. In 2-years of follow-up, the prognosis of patients was good. There were no differences at 2-year regarding allergic tendencies of the patients, as determined by the increase in total eosinophil count. Conclusion : Hematochezia in neonates and during early infancy is generally a benign and self-limiting symptom. Based on 2-years of follow-up, the prognosis of the patients is good.