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구치부 보철 수복 공간이 부족한 환자에서 이중 스캔을 이용한 구강회복 증례
김준엽,박상원,임현필,윤귀덕,양홍서,Kim, Jun-Yub,Park, Sang-Won,Lim, Hyun-Pil,Yun, Kwi-Dug,Yang, Hongso 대한치과보철학회 2017 대한치과보철학회지 Vol.55 No.2
구치부 지지 상실은 대합치의 정출, 잔존 치아의 교모 등으로 교합평면의 부조화와 보철수복공간 부족을 야기할 수 있다. 이러한 환자는 수직교합고경 분석이 선행되어야 하며, 수직교합고경의 증가가 필요한 경우 적절한 임시 수복물 제작을 통해 기능적, 심미적 측면을 평가해야 한다. 최종 보철물 제작에 임시 수복물의 정보를 반영하는 방법으로 이중 스캔을 이용할 수 있다. 본 증례는 구치부 상실 및 대합치의 정출로 보철수복공간이 부족하나 수직교합고경의 감소가 미미한 환자에서 이중 스캔을 이용하여 수복하였다. Loss of posterior support may cause extrusion of antagonistic teeth and excessive wear of remaining teeth which often leads to the destruction of the occlusal plane. In such cases, it is critical to verify the need to increase vertical dimension of occlusion (VDO). Should you increase VDO, provisionalization is crucial in evaluating function and esthetics. Double scanning technique is a useful method when fabricating definitive restoration that mimic provisional restoration. In this case, a patient with apparently no loss of VDO and insufficient interocclusal space for dental materials due to loss of posterior support and extrusion of antagonistic teeth was rehabilitated using double scanning technique.
(t, n) 임계치 기법을 이용한 센서네트워크에서의 공개키 인증
김준엽,김완주,이수진,Kim, Jun-Yop,Kim, Wan-Ju,Lee, Soo-Jin 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.5
Earlier researches on Sensor Networks preferred symmetric key-based authentication schemes in consideration of limitations in network resources. However, recent advancements in cryptographic algorithms and sensor-node manufacturing techniques have opened suggestion to public key-based solutions such as Merkle tree-based schemes. These previous schemes, however, must perform the authentication process one-by-one in hierarchical manner and thus are not fit to be used as primary authentication methods in sensor networks which require mass of multiple authentications at any given time. This paper proposes a new concept of public key-based authentication that can be effectively applied to sensor networks. This scheme is based on exponential distributed data concept, a derivative from Shamir's (t, n) threshold scheme, in which the authentication of neighbouring nodes are done simultaneously while minimising resources of sensor nodes and providing network scalability. The performance advantages of this scheme on memory usage, communication overload and scalability compared to Merkle tree-based authentication are clearly demonstrated using performance analysis.
김준엽,이시복,Kim, Joon-Yeop,Lee, Si-Bok 한국음향학회 1989 韓國音響學會誌 Vol.8 No.1
탄성 평판에 왕복압축기를 설치할때의 최적마운트 설계문제를 다루었다. 마운트 부재로 네 개의 짧은 중공 고무원통(hollow rubber cylinder)을 사용하여 설계변수로서 고무원통의 두께, 지름, 높이, 그리고 설치위치를 고려한다. 최소 힘 전달율을 주는 최적마운트 매개변수 결정에는 구속 로젠브록법을 이용한다. The optimal mounting system for reciprocating comperssor supported on a flexible is designed. Four short hollow rubber cylinders are used as mounting pads, and so the thickness, diameter, height and location of the rubber mounts are considered as design parameters. The optimal mounts parameters which give the smallest force transmittance, are obtained by Constrained Rosenbrock Method.
불규칙한 하악 운동을 하는 환자의 treatment denture를 이용한 총의치 수복 증례
김준엽,박찬,방몽숙,양홍서,임현필,박상원,Kim, Jun-Yub,Park, Chan,Vang, Mong-Sook,Yang, Hong-So,Lim, Hyun-Pil,Park, Sang-Won 대한치과보철학회 2015 대한치과보철학회지 Vol.53 No.4
많은 무치악 환자들은 부적합한 의치의 장기간 사용으로 인해 불규칙한 하악 운동을 하는 경우가 빈번하다. 총의치 제작 시 기능과 심미성을 만족하기 위해서는 정확한 하악 운동과 중심위를 채득하는 것이 중요하다. 본 증례는 불규칙한 하악 운동으로 중심위 채득이 어려운 환자를 flat occlusal table을 가진 treatment denture를 이용하여 총의치 수복하였기에 보고하는 바이다. Long-term use of ill-fitting dentures may cause irregular movements of the mandible. In such cases, satisfactory outcomes both in terms of function and esthetics could be achieved by accurate registration of mandibular movement and centric relation when fabricating new dentures. In this case, treatment dentures with flat occlusal tables were used to register centric relation and mandibular movements of a patient with erratic mandibular movements.
한국 주니어 테니스 선수의 근골격계 통증에 대한 설문 조사
김준엽 ( Joon Yub Kim ),문승준 ( Seung Jun Moon ),유정현 ( Jeong Hyun Yoo ),김주학 ( Joo Hak Kim ),손동욱 ( Dong Wook Sohn ),정재홍 ( Jae Hong Jung ),김우성 ( Woo Sung Kim ) 대한스포츠의학회 2015 대한스포츠의학회지 Vol.33 No.2
The aim of this survey was to analyze the characteristics of musculoskeletal pain of Korean junior tennis players and its effect on games and psychology of players. Surveys were administered to 30 healthy male junior tennis players who took part in a 50th national junior tennis meet in 2015. We analyzed the incidence, location, cause and preferred prevention or treatment method of musculoskeletal pain, the correlation between training time and musculoskeletal pain as well as the effect of musculoskeletal pain on games and psychology of players. Overall, 22 out of 30 (73.3%) responded the experience of musculoskeletal pain. The incidence of lower extremity pain (16 out of 30, 53.3%) were higher than upper extremity pain (9 out of 30, 30%) and low back pain (8 out of 30, 26.7%). The long training hours per day (r=0.574, p=0.001) and old age (r=0.390, p=0.033) were correlated with intermittent back pain in univariate anlaysis. In multivariate ananlysis, the long training hours per day was a single risk factor of intermittent low back pain (p=0.038, odds ratio 10.01). 43.3% of players responded that the insufficent preventive conditioning program was thought to be the cause of musculoskeletal pain. The most preferred treatment or prevention method for musculoskeletal pain was rehabilitation (55.3%). Twelve players reported the negative affection of musculoskeletal pain to the performance in game. Six players experienced the frustration, 9 playersexperienced the loss of interest and 9 players experienced the emotional avoidance of games due to the musculoskeletal pain.
김준엽 ( Joon Yub Kim ),김재윤 ( Jae Yoon Kim ),윤종필 ( Jong Pil Yoon ),정석원 ( Seok Won Chung ),김동현 ( Dong-hyun Kim ),원유선 ( Yoo-sun Won ) 대한스포츠의학회 2020 대한스포츠의학회지 Vol.38 No.4
Purpose: The aim of current study is to verify the efficacy of extracorporeal shock wave therapy (ESWT) in neck and shoulder pain syndrome. Methods: We enrolled 23 patients with neck and shoulder pain syndrome (mean age, 55±16 years; onset, 12.65±8.90 months) who underwent ESWT from July to December 2019. ESWT (4 to 5 bar or 0.23-0.45 mJ/mm<sup>2</sup>, 1,500 to 2,000 times/region, 7 Hz) was performed at least 4 consecutive times per week. Evaluated outcomes were visual analogue scale (VAS) of pain and tenderness, neck disability index (NDI), and shoulder passive range of motion (ROM; forward flexion [FF], external rotation at neutral [ER], internal rotation at back [IR]). Pain and tenderness VAS scores were assessed at every follow-up, while NDI and shoulder ROM were evaluated two times before treatment and at the final follw-up (at 4.52±0.73 weeks). Results: The pain VAS score decreased from 5.5±2.4 at first visit to 4.0±1.8 (p=0.001), 3.3±2.1 (p=0.02), and 3.1±2.2 (p=0.29) at the first, second, and third follow-up visits. The tenderness VAS at first visit was 5.98±1.89, which decreased to 5.17±1.83 (p=0.005), 4.61±1.67 (p=0.05), and 4.09±1.92 (p=0.06) at the first, second, and third follow-up visits. NDI was significantly reduced from 18.04±8.86 to 10.04±6.94 at last follow-up (p=0.001) and shoulder ROM was significantly improved after treatment (FF: 159.6°±28.0° to 177.8°±8.5°, p=0.001; ER: 72.2±15.7° to 79.6±2.1°, p=0.02; IR: 10.2±3.49 [T 10] to 6.9±1.7 [T 7], p=0.001). Conclusion: Consecutive ESWT was effective in treating neck and shoulder pain syndrome with functional improvement and pain reduction. Regarding simultaneous pain and tenderness reduction, receiving ESWT two times per week was effective.