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Full mouth rehabilitation in a patient with peri-implantitis: A case report
최낙현,조영은,박은진,Choi, Nak-Hyun,Cho, Young-Eun,Park, Eun-Jin The Korean Academy of Prosthodonitics 2019 대한치과보철학회지 Vol.57 No.4
임플란트 주위염(peri-implantitis)은 임플란트 치료를 받은 환자의 20%가량에서 발병하며, 시간이 지날수록 유병률이 증가한다. 경도 또는 중등도의 임플란트 주위염은 비수술적 또는 수술적 방법을 통해 치료될 수 있으나 심한 치조골 흡수를 동반한 경우 임플란트 제거(explanation)를 동반한 재건이 요구된다. 임플란트 주위염은 재발 가능성이 높아 치료계획 단계에서부터 임플란트 주위염의 재발을 방지하기 위한 고려가 필요하다. 본 증례는 임플란트 주위염과 만성치주염으로 진단된 환자의 증례로, 다수의 임플란트 제거 및 다수 치아 발치 후 상악은 임플란트 유지 피개의치, 하악은 임플란트 고정성 보철로 전악 수복하였다. 임플란트 주위염의 재발을 예방하기 위한 수술적, 보철적 방법을 통해 성공적으로 수복하였기에 이를 보고하고자 한다. Peri-implantitis appears in almost 20% of patients who received implant treatment, and increase in its number is inevitable as time goes by. Although it can be treated by both non-surgical and surgical procedures, in cases which include severe bone loss, explantation and rehabilitation may be necessary. Careful treatment planning and considerations to prevent recurrent peri-implantitis should be taken into account. In the following case presented, a patient with chronic periodontitis and peri-implantitis was successfully rehabilitated after removal of several implants. Extraction and explantation of multiple teeth and implants were followed by full mouth reconstruction with fixed implant prostheses on the mandible and implant retained overdenture on the maxilla. Surgical and prosthetic measures to prevent recurrent peri-implantitis were taken into consideration.
최낙현(Nak Hyun Choi),박정영(Joung Young Park),이배진(Bai Jin Lee),변동일(Dong Il Byun),김형길(Hyung Gil Kim),정동균(Dong Gyoon Jung) 대한내과학회 1996 대한내과학회지 Vol.51 No.1
Hypothyroidism in frequently overlooked in the elderly because many of its symptoms are attributed to the normal aging process, Hypothyroidism may be accompanied by rheumatic syndromes such as neuropathy, myopathy, and arthropathy with chronic joint effusion. Because these symptoms are correlated with severity and durations of the hypothyroid state, early diagnosis may prevent severe articular sequelae. We experienced a case of primary hypothyroidism presenting with destructive arthropathy and thyroid replacement therapy was followed by longterm improvement
WPAN LR-UWB 시스템에서 유동적인 PPM 방식을 이용한 적응적인 변복조 방법
최낙현(Nak-Hyun Choi),황재호(Jae-Ho Hwang),김주경(Joo-Kyung Kim),김재명(Jae-Moung Kim) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
LR-UWB utilizes BPSK and PPM for the transmission, which embeds the information in the transmitted pulse position. Meanwhile, by using coherent method, there is approximately 3㏈ enhancement on the BER performance over that using non-coherent method. However, due to the variable channel conditions, conventional system which uses fixed modulation is not efficient. To maximize the efficient and performance, in this paper, we propose an adaptive method including 4PPM+BPSK mode and 2PPM mode, in which the modulation method is dynamically changed depending on the channel condition which is determined according to the preamble correlation output.
최웅송(Oung Seung Choi),박정영(Jong Young Park),이배진(Bai Jin Lee),이정호(Jung Ho Lee),김형기(Hyung Gi Kim),최낙현(Nak Hyun Choi),박봉수(Bong Sou Park),김시찬(Si Chan Kim),변동일(Dong Il Byun),김형길(Hyung Gil Kim),정동균(Dong Gyoon 대한내과학회 1994 대한내과학회지 Vol.47 No.6
Osteopetrosis (also called Albers-Schoberg's disease, Marble bones and chalk bones) is a rare hone dysplasia in which, on the basis of a failure of osteoclastic and chondroclastic resorption, the bone become exceedingly dense. Two clinically distinct forms are now recognized and have different patterns of inheritance. The milder form is transmitted as an autosomal dominant trait and the more severe form is transmitted as an autosomal recessive trait. We have experienced a familial osteopertrosis, mother and three siblinges out of six, which was thought to be a autosomal dominant inheritance. We report a case of milder form of osteopetrosis with a review of literature.
나영준(Young-Jun Na),최낙현(Nak-Hyun Choi),권상혁(Sang-Hyuk Kwon),윤용태(Yong-Tae Yoon),이상성(Sang-Sung Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
에너지 절약은 매우 큰 이슈이다. 현재 우리나라에서는 요금체계에 누진율을 적용함으로써 전기에너지 절약을 실현하고 있다. 하지만 에너지 소모를 증가시키는 피크부하 발생을 억제하기에는 부족한 면이 많다. 이러한 점을 보완하기 위하여 역 누진제를 추가로 적용한 다중 누진제를 제시한다. 피크부하 발생을 억제하면서 기존의 이윤을 유지하는 방안을 마련한다. 밤에 역 누진제를 적용함으로써 밤의 전력사용량을 증가시키고 낮의 전력 사용량을 감소시켜서 시간별 전력 수요편차를 줄이고 낮의 기존 누진제 체계에 선형적인 요금 증가로 역 누진제 사용에 의한 이윤 감소를 어느정도 보충할 것이다. 이러한 방법을 통하여 피크부하 발생을 줄이고 결과적으로 에너지 절약을 실현할 것이다.
공장 장간막에 발생한 원발성 악성 섬유성 조직구종 1 예
박찬근(Chan Keun Park),이정호(Jung Ho Lee),김형기(Hyung Gi Kim),박봉수(Bong Sou Park),최낙현(Nak Hyun Choi),최웅승(Oung Seung Choi),방규태(Gyu Tae Band),변동일(Dong Il Byun),정동균(Dong Kyoon Jeong),권국환(Kuk Hwan Kwon) 대한내과학회 1994 대한내과학회지 Vol.47 No.5
Malignant fibrous histiocytoma was introduced in the early 1960s to describe a well known sarcoma of soft tissue, the tumors arise on the extremities or in the retroperitoneum and are located adjacent to deep fascia or within skeletal muscle. Local recurrence and distant metastasis are very common. Intraabdominal Malignant fibrous histiocytoma are very rare and only several cases were reported till now. We report one case of intraabdominal primary malignant fibrous histiocytoma in 21-year old female patient who had growing nontender mass of left lower abdomen. The presenting site was the mesenteric border of the proximal jejunum about 60 cm below the ligament of Treitz.