광섬유 집합체 센서를 이용한 6MV 광자선의 반음영 및 심부선량백분율 측정

신상훈,장경원,조동현,유욱재,서정기,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-

In this study, a fiber-optic bundle sensor has been developed using water-equivalent organic scintillating fibers for photon beam measurement. Beam penumbra and percent depth doses(PDD) are measured according to the depth of the photon beam. This sensor has many advantages such as high resolution, real-time measurement and ease of calibration over conventional radiation measurement devices.

Single Median Maxillary Central Incisor(SMMCI) 환아의 증례보고

신윤경,김영재,김정욱,장기택,이상훈,한세현,김종철 大韓小兒齒科學會 2007 大韓小兒齒科學會誌 Vol.34 No.4

Anatomic abnormalities of teeth development include the presence of a single maxillary central incisor at midline instead of two central incisors. The incidence of cases with a single maxillary central incisor is approximately 1 in every 50,000 live births. single median maxillary central incisor(SMMCI) may be a integral manifestation of anyone of a number of syndromes. It has been reported an association with several midline disorders which have varied in severity. A SMMCI has also been reported as an isolated finding. But in some cases, it has been considered as an incomplete expression of autosomal dominant holoprosencephaly. So any patient who appears for treatment with a SMMCI should be referred for a detailed medical examination to exclude other associated systemic abnormalities and for mutation analysis to facilitate correct diagnosis and the provision of appropriate genetic counseling. Early orthodontic treatment is needed to minimalize emotional trauma of child. This case report was about three patients with a SMMCI as isolated finding. The purpose of these case reports was to present cases of single maxillary central incisor not associated with other disorders. Single Median Maxillary Central Incisor(SMMCI)는 상악 중절치 형성부전으로 하나의 상악 중절치가 정중앙에 위치하는 치아 발달의 해부학적 이상을 의미한다. 50,000명 중에 1명 꼴로 발생할 정도로 아주 드물며 각종 증후군 및 정중선 이형성을 보이는 발달장애와 연관되어 나타나는 것으로 보고되고 있다. SMMCI는 다른 이상과 연계되지 않고 독립적으로 나타날 수도 있으나 상염색체 우성유전인 전전뇌증(holoprosencephaly)의 경미한 발현일 가능성이 있으므로 유전자 상담이 필요하다. 또 특징적인 안모 및 구강 상태를 보이므로 환아의 바람직한 신체적,정서적 발달을 위해 조기에 교정적 접근이 필요하다. 본 증례는 다른 이상 소견을 보이지 않는 세 명의 SMMCI 환아의 증례를 보고하는 바 이다.

전신성 홍반성 낭창의 임상적 고찰

신영태,김종학,장윤경,양종오,구영선,강민규,황평주,나기량,이강욱,서광선 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.1

The epidemiology, diagnostic criteria, clinical features, symptoms and signs laboratory findings, kidney pathology, and clinicopathologic correlation of systemic lupus erythematosus(SLE) were analyzed. The 63 patients studied were managed at the Department of Internal medicine, CNUH, from January 1983 to December 1997. Kidney biopsy was performed in 53 patients out of 63 patients with SLE. The results were as follows: 1. The ratio of male to female was 1:26. They were 12 to 71 years old and mean age was 32.1 years old. The peak age incidence was 4th decades(30%). 2. The most frequent chief complaint on admission was generalized edema. Most patients complain two or more symptoms. 3. Immunologic and renal disorders were the most frequently observed in the ARA criteria of SLE. And the positive ANA, hematologic disorder, malar rash, and arthritis, were observed in order of frequency. 4. Among the 53 patients with renal biopsy, 30 patients revealed class Ⅳ lupus nephritis(56%), class II in 12 patients(23%), class V in 8 patients(15%) and class III in 2 patients(6%). 5. The cases of lupus nephritis represented as nephrotic syndrome were high in the class IV with 68% and class V with 86%. 6. Of 30 patients who can be followed up, 5 patients resulted in death(17 % of mortality). They "were 14 to 57 years old and mean age was 28 years old. Follow up duration were from 1 month to 6 years and 3 months, and mean duration was 1 year and 1 month, but 3 cases 7. The causes of death were as follows: Two cases were due to seizure and coma resulted from CNS involvement. One was sepsis due to miliary the & pneumonia. One was dilated cardiomyopathy and heart failure due to cardiac ac involvement. And the other one was sepsis and acute renal failure resulted from cellulitis. 8. Prednisolone was used in all patients basically, and methyl-prednisolone pulse therapy, antimalarials and alkylating agents were used in some cases. In the cases of combined therapy, the activity of SLE was well controlled.

어린이에서 함치성 낭과 연관된 매복 소구치와 대구치의 치료

신차욱,김영재,김정욱,장기택,이상훈,김종철,한세현 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.4

치아 매복은 어린이 환자 진료시에 자주 관찰되는 맹출 장애이다. 어린 환자에서 매복된 치아가 존재하는 경우,함치성 낭과 연관이 있을 가능성이 높다. 함치성 낭은 제3대구치를 제외하고는 상악 견치,하악 소구치 부위에서 가장 호발하며,점진적인 증식으로 악골이 팽윤되어 안모를 변화시키며,주위 악골의 파괴와 치근의 흡수를 야기하거나 침범된 치아의 변위를 유발할 수 있으므로,조기 진단과 적절한 치료가 무엇보다도 중요하다. 함치성 낭과 연관된 치아가 과잉치나 지치라면,치아의 발거를 포함한 완전한 낭종 적출술이 적절한 치료라 할 수 있지만,그렇지 않은 경우에는 환자의 심리적,정선적 외상을 예방하기 위해 원인 치아의 보존이 고려되어야 할 것이다. 이뿐만 아니라,치아의 변위 정도,골 파괴 정도,치근의 성숙도,주위 치아와의 관계,환자의 교합과 구강 악안면 영역의 성장 양상 등도 같이 고려되어야 할 것으로 생각된다. 본 증례에서는 위와 같은 사항들을 고려하여,함치성 낭과 연관된 매복 소구치와 대구치블 낭종 적출술 후 공간 유지,외과적 수술과 교정적 견인,외과작 발거 후 교정적 배열 등의 방법을 통해 양호한 치료 결과를 얻었기에 보고하는 바이다. Tooth impaction is a frequently observed eruption anomaly in pediatric dental practice. Young patients with impacted or unerupted teeth have more prediction for dentigerous cyst formation. Dentigerous cyst presents radiographic features. unilocular or multilocular radioluscency. Cysts occur most frequently in the premolar region except third molar. Dentigerous cysts can grow to a considerable size, and large cysts may be associated with a painless expansion of the bone in the involved area. Extensive lesions may result in facial asymmetry, osseous destruction, root resorption of proximal teeth and displacement of associated tooth. The nature of the causative tooth influences the type of surgical treatrnent required for the dentigerous cyst. If the cyst is associated with a supernumerary or wisdom tooth. complete enucleation of the cyst along with extraction of tooth may be the first treatment choice. Otherwise. preservation of the associated teeth should be considered to prevent a young patient from psychological and mental trauma because of the loss of tooth. We should consider the degree of tooth displacement. osseous destruction and growth pattern of oromaxillofacial area when planning treatment. Thus a proper and logical treatment planning can help a proper growth and development of oromaxillofacial area and can save the patient from a psychological and mental trauma. This report describes 4 cases of the management of impacted premolars and molars associated with dentigerous cysts in children.

치아 맹출전 시행한 기관 삽관이 유치열기에 미치는 영향에 대한 증례보고

신윤경,Hyun, Hong-Keun,김영재,김정욱,장기택,이상훈,김종철,한세현 大韓小兒齒科學會 2008 大韓小兒齒科學會誌 Vol.35 No.3

유치 맹출전에 치조융기에 가해진 외상은 유치의 맹출 지연 및 형태이상,치배의 변위 등을 일으킬 수 있으며 심한 경우 구개의 흠 형성,절치의 결함 및 후천성 구개열 등을 야기할 수 있다. 본 증례는 치아가 맹출하기 전에 수차례의 기관 삽관을 시행한 병력이 있는 심한 저체중아에서 맹출지연,형태이상,법랑질 저형성,영구치 치배 등의 변위가 관찰되어 이를 보고하는 바이다. Delayed eruption and abnormal morphology of the primary incisors following intubation may be due to follicular displacement and localized trauma caused by the process of intubation. Result of such damage included palatal groove formation, defective incisors and acquired clefts. This clinical report presents effect of intubation on the primary dentition of premature low-birth-weight children prior to tooth eruption.

일측 요관폐쇄에 의한 실험적 수신증에서 신조직내 MCP-1 및 TNF-α유전자 발현

나가량,황평주,김종학,구영선,강민규,서광선,이강욱,신영태 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.2

Early cellular and molecular derangements have been suggested as potential pivotal factors for the development of renal injury, such as interstitial fibrosis after the experimental hydronephrosis. Several recent studies have been demonstrating that one of the initial events taking place in the progressive renal injury process is the mononuclear cell infiltration in the glomeruli and tubulointerstitiuim. In order to evaluate the renal light microscopic findings as well as the renal cortical MCP-1 and TNF-α gene expressions which are modulating inflammatory process and the recruitment of mononuclear cells in many experimental models of renal injury, Sprague-Dawley rats underwent unilateral ureteral obstruction (UUO) and sham operation under the thiopental sodium anesthesia(50 mg/kg intraperitoneal injection). Three and 7 days after surgery, rats were sacrificed. By the competitive RT-PCR, the levels of TNF-α and MCP-1 mRNA in renal cortical tissues were measured. The magnitude of mononuclear cell infiltration and interstitial widening were evaluated by standard point counting method. The level of MCP-1 gene expression was significantly increased in UUO group compared to sham group at 3 and 7 days after surgery(UUO 3 days 8.99 ± 0.45, UUO 7 days 11.2 ± 0.26, sham 3 days 1.00 ± 0.08, sham 7 days 0.94 ± 0.05, p < 0.01, p < 0.01, mean ± SEM, respectively). The level of MCP-1 mRNA at 7 days after surgery was significantly higher than that at 3 days in UUO group. The TNF-α gene expression level of UUO group was also significantly higher than that of sham group at 3 and 7 days after surgery(UUO 3 days 1.73 ± 0.16, UUO 7 days 2.03 ± 0.21, sham 3 days : 1.00 ± 0.06, sham 7 days 1.09 ± 0.03, p < 0.01, p < 0.01, respectively). But there was no significant difference between the levels at 3 and 7 days after surgery in UUO group(p>0.05). On the light microscopic examination, the relative volume of interstitium (RVI) and the total count of infiltrated mononuclear cells(MCC) at 3 and 7 days after surgery in UUO group were also significantly higher than those of sham group(RVI ; UUO 7 days 14.9±1.0%,sham 6.0±0.7%, MCC; UUO 7days 34.0± 1.6, sham 3.7± 0.6, p < 0.01, p < 0.01, respectively). In conclusion, we speculated that the early up-regulation of MCP-1 and TNF-α genes of renal cortical tissue in this experimental hydronephrosis model is closely related to the mononuclear cell infiltration and tubulointerstitial fibrosis.

2단 IMDCT Recursive 구조를 이용한 MPEG-2 AAC 복호화기의 필터뱅크 구현

박세기,강명수,오신범,이채욱 대구대학교 정보통신연구소 2003 情報通信硏究 Vol.2 No.1

MPEG-2 AAC(Advanced Audio Coding)는 높은 압축율과 고음질의 특성을 갖는 멀티채널 오디오 압축 표준으로 알려져 있고, 대우 낮은 비트율에서 방송 음질 수준의 오디오를 제공하기 위해서 고해상도 필터뱅크(high-resolution filter bank), 예측기법(prediction), 허프만 부호화(Huffman coding) 등을 결합하여 사용한다. MPEG-2 AAC 필터뱅크에서 부화화기와 복호화기에서 각각 수행하는 MDCT(Modified Discrete Cosine Transform)/ IMDCT(Inverse MDCT) 연산은 특히 많은 연산을 필요로 한다. 본 논문에서는 MPEG-2 AAC 실시간 복호화 시스템을 하드웨어로 구현시 IMDCT의 연산에 적합한 2단 IMDCT의 Recursive 구조를 제안한다. 그리고 메모리와 연산속도, 하드웨어의 복잡도를 기존에 제안된 알고리듬과 비교하였다. MPEG-2 Advanced Audio Coding(AAC) is the uideb used audio standard and offers the high-quality multi-channel surround audio AAC algonthm combines the coding efficiency of a high-resolution filter bank, prediction techniques, and Huffman coding to achieie the broadcast-qualitv audio at very low data rates The foruard and inperse modified discrete transform(MDCT) are two of the most computational) 1 intensive operation in the MPEG-2 AAC In this paper, we propose the suitable recursive structure at IMDCT process for MPEG-2 AAC real-time decoder, and compared the memory, the computation speed and complexity of hardware with the proposed algonsms

방사성 페기물 처리장의 지하수 온도 측정을 위한 광섬유 센서의 제작 및 특성 분석

서정기,유욱재,장경원,조동현,신상훈,이봉수 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-

Fiber-optic temperature sensing technology can alternative to classical measurement techniques in nuclear environment, Its advantages allow low cost, a long distance measurement and real-time, In this study, we have measured the optical power of power meter and the output voltage of photodiode according to change temperature of water.

신장조직 손상의 진행에 있어서 Renin-Angiotensin System 의 역할에 관한 연구

이강욱,송정헌,강민규,황평주,김종학,나기량,서광선,박정규,신영태 대한신장학회 2001 대한신장학회잡지 Vol.20 No.3

한국인 소아의 성장 발육 평가 자료 제작에 관한 연구

김영재,이신재,김정욱,장기택,이상훈,한세현,김종철 大韓小兒齒科學會 2006 大韓小兒齒科學會誌 Vol.33 No.2

성장기 환자를 다루는 소아치과 분야에서 환아의 성장과 발육에 대한 지식이 필수적이다. 하지만, 현재 사용되고 있는 소아 성장 측정 도표는 현 시대성을 반영하지 못하는 오래된 것이거나 혹은 의과적 용도에 맞추어져 있어서 소아치과 분야에 적용하기에는 연령이 극히 제한적이었다. 이에 따라 본 연구는 2004년 산업자원부 기술표준원에서 시행하고 대한인간공학회에서 주관한 2004년 제5차 한국인 인체치수조사사업보고서를 토대로 현실성있고 유용한 성장 곡선 및 성장 속도 곡선을 제작하는 과정을 소개할 목적으로 시행되었다. 자료를 처리하고 재배열하는 과정을 통하여 자료의 변이를 사분위수를 기본 골격으로 하고 1, 5, 95, 99 백분위수를 추가하여 남·여별 키·몸무게 성장 곡선을 제작하였고 이와 아울러 기하 평균에 기초한 성장 속도 곡선도 제작하여 체성 성장 관찰 도표를 완성하였다. 본 연구 결과 생성된 성장 발육 평가 자료는 성장 발육의 지표로 이용될 수 있으며, 성장 발육과 관련, 소아치과 환자·보호자와의 의사소통에 도움이 될 수 있을 것으로 생각되었다. Knowledge of growth and development is essential for pediatric dentistry treating growing patients. The data from the pediatric growth curve being used today does not reflect the growth transition of modern times, nor does it match the age range required for dental purposes. The present study, therefore, aims to introduce the process of producing a growth curve and growth rate curve based on data which represents a more accurate description of the present situation. The original data used in this study were from 5th nationwide survey. SIZE KOREA 2004 study carried out by the Technology and Standards Policy Division. Department of Technology and Standards Planning. Ministry of Commerce, Industry, and Energy. Processing and rearranging the produced data with variations divided into the three quartiles and the 1st, 5th 95th and 99th percentiles were included to produce a growth observation chart according to sex, height and weight differences. In the same way, a growth rate curve based on the geometric mean value was produced. The resulting growth charts can be used as an index for growth and development, and used for better communication between the pediatric dentist, patients or their parents.