• School Mathematics
• /
• v.14 no.4
• /
• pp.409-429
• /
• 2012

This paper reports the process two 11th grade students went through in reinventing derivatives on their own via a context problem involving the concept of velocity. In the reinvention process, one of the students conceived a tangent line as the limit of a secant line, and then the other student explained to a peer that the slope of a tangent line was the geometric mean of derivative. The students also used technology to concentrate on essential thinking to search for mathematical concepts and help visually understand them. The purpose of this study was to provide meaningful implications to school practices by describing students' process of reinvention of derivatives. This study revealed certain characteristics of the students' reinvention process of derivatives and changes in the students' thinking process.

• Journal of Chest Surgery
• /
• v.43 no.4
• /
• pp.462-465
• /
• 2010

Acquired bronchoesophageal fistula rare. Conservative treatment such as endoscopy is widely used. The recurrence rate after endoscopic treatment, however, is not well known. We report here on a case of a 54-year-old female who presented with recurrent bronchoesophageal fistula after endoscopic treatment that filled the fistula tract with $Histoacryl^{(R)}$.

• Journal of Chest Surgery
• /
• v.31 no.2
• /
• pp.198-202
• /
• 1998

The recurrence of an anterior mediastinal mass was discovered incidentally on the chest film for an asymptomatic 72-year-old female. She underwent the mass resection at the same site in 1989 and was diagnosed as a paraganglioma of the anterior mediastinum. She had poorly controlled hypertension which was converted into normal blood pressure after the first operation. During the follow up, the catecholamine levels were within normal limits, and there were no evidence of recurrence of the tumor. However, 6.3 years later, the mass recurred at the same anterior mediastinum. The patient had no hypertension and catecholamine levels were still within normal limits. The recurring mass was successfully removed and had the same histological findings - recurring paraganglioma.

• Proceedings of the KOR-BRONCHOESO Conference
• /
• 1991.06a
• /
• pp.42-42
• /
• 1991

부비동에 발생하는 악성종양은 자각증상이 비교적 늦게 나타나 병변이 많이 진행된 후에 발견되는 경우가 대부분이다. 진행된 부비동압의 치료는 수술, 화학요법, 방사선요법의 병용치료법이 종래부터 시도되어왔으며 대부분의 경우 광범위한 수술적 절제가 필요하여 이에 따른 후유증이 크고 치료결과는 아직 많은 논란이 있다. 저자들은 진행된 부비동암 (T4)환자 10명에서 유도화학요법 (Cisplatin, 5-FU)후 수술 (상악절제술 4예, 두개안면 절제술 1예 )과 방사선 치료 (약 7000 cGy)를 받은 5명과 유도화학요법후 방사선치료만 받은 5명을 비교하여 다음과 같은 결과를 얻었다. 1. 수술을 포함한 병용요법을 받은 환자 6명중 3명은 평균추적기간 28개월 동안 재발의 증거가 없었으나 2명에서 국소재발이 있었고 이들은 국소 절제술 및 방사선치료후 현재 1년 이상 무병상태이다. 2. 수술을 포함한 병용요법을 받은 환자 5명중 4명에서 초진시 안와내 종양침윤의 소견이 있었으나 수술시 안와를 보존하였고 그 후 안와 부위의 국소 재발은 없었다. 3. 유도화학요법과 방사선치료만을 받은 5명 모두 6개월 이내에 국소재발하였다. 4. 진행된 악성 부비동암은 수술을 포함한 병용요법으로 좀 더 좋은 치료성적을 얻을 수 있을 것으로 기대된다.

• Journal of Chest Surgery
• /
• v.32 no.3
• /
• pp.326-329
• /
• 1999

Pulmonary lymphangioleiomyomatosis is a rare disease occurring almost exclusively in woman of reproductive age. It is characterized by rapid deterioration of respiratory functions and results in death within an average of 10 years. This disease is caused by a progressive proliferation of atypical smooth muscle in the pulmonary lymphatic vessels, blood vessels, and airways leading to the development of distal cystic changes which causes frequent recurrent pneumothoraces. We experienced a case of pulmonary lymphangioleiomyomatosis in a 30-year old woman who had a history of bilateral, recurrent pneumothoraces. The patient underwent lung biopsy through right thoracotomy which revealed the diagnosis of pulmonary lymphangioleiomyomatosis. We report a case with a review of the literature.

• Childhood Kidney Diseases
• /
• v.14 no.1
• /
• pp.100-104
• /
• 2010

We report on two children with a high risk of recurrent focal segmental glomerulosclerosis (FSGS) after renal transplantation that could be effectively prevented by prophylactic administration of cyclosporine combined with preemptive plasmapheresis prior to renal transplantation.

• Journal of the Korean Society of Radiology
• /
• v.83 no.4
• /
• pp.904-909
• /
• 2022

Uterine cervical cancer is one of the most common malignancies of the female genital tract. Most recurrent cases of uterine cervical cancer are diagnosed within two years after primary treatment, and late recurrence after a disease-free interval of more than five years is rare. In addition, peritoneal metastases usually present as multifocal discrete nodules in the peritoneal cavity with nodular or diffuse peritoneal thickening. Herein, we report an extremely rare case of late recurrent cervical cancer peritoneal metastasis with an unusual manifestation of a large, solitary necrotic mass in the right subphrenic space on contrast-enhanced CT.

• The Journal of the Korea Contents Association
• /
• v.20 no.4
• /
• pp.673-685
• /
• 2020

The purpose of this study is to specifically investigate the factors that affect maintenance, relapse, and recovery after the abstinence of female drug addicts. For such purpose, ten females who repeated drug addiction and are currently in recovery were selected as the study participants to carry out in-depth interviews. The original materials were analyzed using descriptive phenomenological methods of Giorgi. The results of the analysis showed that most participants experienced discrimination and inhospitable treatment in their childhood. They began taking drugs as an escape from their difficult realities or out of curiosity and worked at adult entertainment establishments, living as a drug addict for a long time. Drugs gave them extreme sexual pleasure and it was difficult for them to recover as their body became dependent on drugs. However, as they experienced religious awakening or existential existence, they gained an opportunity for newly understanding themselves. Social support was an essential resource for their recovery. However, various kinds of trauma that they experienced in their lives acted as a factor to worsen drug addiction. Based on the study results, this study proposes spirituality, actual programs, and trauma treatment approaches that can contribute to the restructuring of life.

• Korean Journal of Head & Neck Oncology
• /
• v.31 no.2
• /
• pp.29-35
• /
• 2015

목적 : 국소 재발한 진행된 갑상선 유두암의 치료로 수술 후 외부방사선의 역할을 알아보고자 하였다. 대상 및 방법 : 원자력병원에서 2000년 1월부터 2012년 2월까지 사이버나이프 혹은 외부방사선 치료를 받은 수술과 방사선요오드 치료 후 국소 재발한 진행된 갑상선 유두암 환자 13 명을 대상으로 하였다. 경과관찰 기간 동안 국소 및 부위 재발이 발생환 환자는 6 명이었다. 몇몇의 위험인자를 찾기 위해서 Kaplan-Meier method와 log-rank test를 이용하여 성별, 종양단계, 방사선 치료 전 수술 횟수, 방사선요오드치료 횟수, 수술 후 잔존 암의 여부, 원격전이에 대해 단변량 분석하였다. 결과 : 방사선 치료 후 평균 추적관찰기관은 53.8개월(범위, 36 ~ 108개월)이고 그중 남자는 4 명이었다. 1년, 2년의 무진행 생존률은 각각 76.9와 53.8%였다. 단병량 분석은 성별과 잔존 암여부(p = 0.0475 and p = 0.0475, 각각)에 따라 무진행 생존률이 진행한 그룹과 진행하지 않은 그룹 사이에 유의한 차이가 있다는 것을 보여줬다. 결론 : 외부 방사선 치료 전에 잔존 암이 없었던 환자의 100%에서 국소 및 부위 재발이 일어나지 않았다. 외부방사선 치료는 수술과 방사선요오드 치료에 반응하지 않는 환자 중 수술 후 잔존 암이 없는 경우에 효과적인 치료 방법이 될 수 있다.

• Radiation Oncology Journal
• /
• v.8 no.2
• /
• pp.255-260
• /
• 1990

From April 1985 to September 1989, 26 patients with stage I and II non-Hodgkin's lymphoma of unfavorable histology localized in head and neck region were treated with combined modality (combination chemotherapy plus radiotherapy) at the Department of Therapeutic Radiology in Kyungpook National University Hospital. Of the 26 patients, 23 showed complete response and 3 partial response. Between these two groups there were no statistical differences according to the variables. Three-year survival and disease-free survival rate were $62.4{\%}$ and $65.2{\%}$, respectively. Unilateral involvement of neck node (p<0.05), radiation dose over 5000 cGy (p<0.01), and 6 or more cycles chemotherapy (p=0.06) had a favorable effect on 3-year survival rate. There were 8 recurrences including 3 partial responders, 1 local failure, 1 distant failure, 1 contiguous failure, and 2 simultaneous local and distant failure. It could be suggested that combined modality treatment might be necessary for the treatment of stage I and II Non-Hodgkin's lymphoma of unfavorable histology.