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Management of Habitual Temporomandibular Joint Dislocation by Eminectomy
Bumjoo Baek,최진영 대한구순구개열학회 2018 대한구순구개열학회지 Vol.21 No.2
Temporomandibular joint (TMJ) dislocation(luxation) occurs when the condyle moves out of the glenoid fossa upon mouth opening and is locked anteriorly to the articular eminence. The dislocation leads to protective contraction or spasm of masticatory muscles, which reinforces the locked state, with or without pain. Usually, the episodes are triggered by any activities that lead to wide mouth opening such as yawning, laughing, and prolonged, excessive mouth opening during a dental or medical exam. It is a distressing and embarrassing situation for the patient. Repetitive dislocation of TMJ is defined as recurrent or habitual TMJ luxation. There are many treatment modalities available ranging from conservative approach to surgical approach. However, conservative approaches usually offer only a temporary solution and they have significant failure rate. Surgical approaches are available with varying degrees of success. Eminectomy is the most predictable surgical treatment for recurrent TMJ luxation. Herein, we report a case of a 47-year old male patient who was diagnosed with bilateral recurrent TMJ luxation that was successfully treated through bilateral eminectomy.
Orthodontic and Orthognathic Treatment of a Patient with Cleidocranial Dysostosis: Case Report
Bumjoo Baek,백승학,최진영 대한구순구개열학회 2018 대한구순구개열학회지 Vol.21 No.2
Cleidocranial dysostosis is a rare genetic disorder that manifests various abnormalities in bone and dental development. Affected individuals show varying degrees of skeletal, dental, and craniofacial abnormalities. Among its many pathognomonic features, hypoplastic maxilla, depressed midface, mandibular prognathism, and multiple retained deciduous teeth and impacted supernumerary teeth may be treated by collaboration between an oral surgeon and an orthodontist. Herein, we report a successfully treated case of a Korean male adult patient, who was diagnosed with cleidocranial dysostosis, by careful planning and execution of combined orthodontic and surgical treatments consisting of a series of dental extractions of multiple retained deciduous teeth and impacted supernumerary teeth, window opening, button bonding and orthodontic traction of impacted permanent teeth, pre-surgical orthodontic treatment, and orthognathic surgery involving Le Fort I osteotomy, bilateral sagittal split osteotomy, malar augmentation, and partial glossectomy. The treatment resulted in notable esthetic and functional improvements and patient satisfaction.
Bumjoo Baek,Jaeman Woo,Jinyoung Choi 대한미용의학회 2017 대한미용의학회지 Vol.1 No.2
Mandibuloplasty is an increasingly popular procedure among East Asians, because they perceive a wide lower face as a sign of stubbornness and coarseness in personality. Especially for females, such a feature is viewed as masculine and undesirable. Mandibuloplasty is often performed intraorally rather than through an extraoral submandibular approach, to avoid facial nerve injury and visible scar formation. However, the intraoral approach provides limited field of view to a surgeon, thereby increasing the risks of inadequate reduction or asymmetric facial contour. The use of 3-dimension (3D) designed surgical guide serves to overcome the limitations of the intraoral approach and is an invaluable and dependable tool. With the advent of 3D printing technologies, surgical guides are designed preoperatively on computed tomography (CT) scans and they are printed for intraoperative applications, such as asymmetric prominent mandibular angles. The use of CT-designed 3D surgical guides allow for predictable surgery with unequivocally symmetric postoperative skeletal contour. This case report will discuss a successful case of mandibuloplasty utilizing the aforementioned technology.
Compressibility and Collapsibility of Coal Fly and Bottom Ash Mixtures
Bumjoo Kim 대한토목학회 2006 KSCE journal of civil engineering Vol.10 No.2
Coal fly and bottom ash are granular by-products of coal-burning for power generation. Either fly ash or bottom ash separately was frequently reused in construction (e.g., structural fills etc.). This paper describes an investigation on the compression and collapse behaviors of non-cementitious fly ash and fly/bottom ash mixtures. A series of single oedometer tests was conducted on compacted fly and bottom ash mixture samples with fly ash contents of 50%, 75%, and 100%, sampled from two Indiana power plants in US. Both soaked and as-compacted samples in different water contents were tested to examine the effects of the fly/bottom ash mixture ratio and compaction water content. Also, collapse potential of ash mixtures was measured at a vertical stress of 100 ㎪. Test results revealed that morphological dissimilarity of ashes with natural soils affects their compression behavior to varying degrees. As fly ash content decreased from 100% to 50%, fly/bottom ash mixtures became slightly more compressible primarily due to crushing occurred in weak bottom ash particles. Breakage of fly ash agglomerates also greatly contributed to deformations. Infiltrated water caused the fabric of compacted ash to become unstable, resulting in deformations under a constant vertical stress. The measured collapse potentials of compacted ash mixtures, which increased with increasing bottom ash content, ranged from 1.0% to 2.2%, falling into the "slightly collapsible range in the classification of collapse potential (ASTM D 5333).
Tunable Ionic Transport for a Triangular Nanochannel in a Polymeric Nanofluidic System
Kim, Bumjoo,Heo, Joonseong,Kwon, Hyukjin J.,Cho, Seong J.,Han, Jongyoon,Kim, Sung Jae,Lim, Geunbae American Chemical Society 2013 ACS NANO Vol.7 No.1
<P>Recently, tremendous engineering applications utilizing new physics of nanoscale electrokinetics have been reported and their basic fundamentals are actively researched. In this work, we first report a simple and economic but reliable nanochannel fabrication technique, leading to a heterogeneously charged triangular nanochannel. The nanochannel utilized the elasticity of PDMS when it bonded with a micrometer-scale structure on a substrate. Second, we successfully demonstrated novel ionic transportations by tweaking the micrometer structures: (1) the transition of nonlinear ionic conductance depending on the nanochannel properties and (2) the ionic field-effect transistor. Nanochannel conductance has two distinguishable nonlinear regimes called the “surface-charge-governed” and the “geometry-governed” regime and its only individual overlooks were frequently reported. However, the transition between two regimes by adjusting nanochannel properties has not been reported due to the difficulty of functional nanochannel fabrication. In addition, a gate voltage was comfortably applied to the triangular nanochannel so that the field-effect ion transportation was reliably achieved. Therefore, presenting triangular nanochannels have critical advantages over its heterogeneous and tunable surface properties and thus, could be an effective means as an active fundamental to control and manipulate the ion-electromigration through a nanofluidic system.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-1/nn3050424/production/images/medium/nn-2012-050424_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn3050424'>ACS Electronic Supporting Info</A></P>
박범주 ( Bumjoo Park ),박기진 ( Kiejin Park ),김성수 ( Sungsoo Kim ) 한국정보처리학회 2005 한국정보처리학회 학술대회논문집 Vol.12 No.1
네트워크 기반 컴퓨터 시스템이 내/외부 침입에 의해 시스템 일부가 손상(Partially Compromised) 되더라도, 최소한의 필수 서비스를 지속적으로 제공할 수 있게 해주는 침입감내시스템(Intrusion Tolerance System)의 설계에 요구되는 요소 기술 중의 하나는 정량적 신인도(Dependability) 분석이라 할 수 있다. 특히, 신인도중에서 생존성(Survivability)은 침임감내의 개념을 일관되게 반영하고 있는 척도(Measure)이므로 침입감내시스템의 설계시 중요한 요소라 할 수 있다. 본 논문에서는 자가치유(Self-healing) 메커니즘을 활용하여 주서버와 보조서버가 각 1 대인 Cold-standby 방식의 침입감내시스템의 상태천이(State Transition)를 표현한 후, 시스템의 가용도 및 생존성을 정의하였다. 또한, 시뮬레이션을 통해 두가지 취약성 공격 사례에 대한 생존성 변화추이를 분석함으로써 신인도 향상 방안을 기술하였다.
A Performance Isolation Mechanism Based on Fuzzy Technique for Web Server Load Balancing
PARK, Bumjoo,PARK, Kiejin,KIM, Bongjun The Institute of Electronics, Information and Comm 2009 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.92 No.4
<P>In this study, a performance isolation mechanism based on a fuzzy control technique is developed in such a way that ambiguous situations caused when estimating the workload of cluster-based web servers, client request rates, and dynamic request rates can be represented effectively. The proposed mechanism involving a fuzzy-based technique is compared with a non-fuzzy technique in terms of the response time in the 95th percentile. Experiments showed that the proposed technique improves the performance of web servers that provide differentiated services.</P>