안면 비대칭 환자에서 Cone Beam Computed Tomography를 이용한 하악골 해부학적 변이의 분석

박성원,오승환,이재인,Park, Seong-Won,Oh, Sung-Hwan,Lee, Jae-In 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.1

Purpose: The study was performed to compare patients with anatomical variations in facial asymmetry with patients in the normal range using cone-beam computed tomography (CBCT) and to take the preoperative condition into consideration in the case of a sagittal split ramus osteotomy (SSRO). Methods: The study was conducted on 46 adult patients composed of 2 subdivided groups, an asymmetry group (n=26) and a symmetry group (n=20). The asymmetry group was divided between patients with hemimandibular hyperplasia (HH, n=8) and hemimandibular elongation (HE, n=18). Using cross-sectional computed tomography images, the thickness of cancelleous bone in the buccal area of the mandible, thickness of buccal cortex in the buccal aspect of the mandible, thickness of cancellous bone in the inferior aspect of the mandible, thickness of buccal cortex in the inferior aspect of the mandible, and cross-sectional surface area of the mandible were measured. Results: In the asymmetry group, the cross-sectional area of the mandible including the inferior alveolar nerve positioned on the affected side was significantly different from the symmetry group. Thickness of cancelleous bone in the buccal aspect of the mandible, thickness of cancelleous bone in the inferior aspect of the mandible, and cross-sectional surface area of the mandible in the affected site of hemimandibular hyperplasia was significantly smaller than in the symmetry group. Conclusion: The inferior alveolar nerve runs lower and in a more buccal direction and shows a smaller cross-sectional surface of the mandible in the hemimandibular hyperplasia patients with asymmetry.

혀의 점막하에 발생한 신경초종 환자의 치험례

박성원,전재호,박주용,최성원,김수호,Park, Sung Won,Jeon, Jae Ho,Park, Joo Yong,Choi, Sung Weon,Kim, Soo Ho 대한악안면성형재건외과학회 2012 Maxillofacial Plastic Reconstructive Surgery Vol.34 No.6

Schwannoma is a benign, slow-growing, tumor of the peripheral nerves without specific symptoms, so that early diagnosis may be difficult. Though approximately 25~40% of all schwannomas occur extracranially in the head and neck region, only 1% of schwannomas are reported in the oral cavity. An 18-years-old female patient visited our clinic with a mass on the middle-right-dorsal surface of the tongue slowly growing for 1.5 years. The patient underwent the surgical removal of the neoplasia under general anesthesia. The mass was well capsulated and a cleavage plane was easily found. There was no recidivation during the course of a one-year follow-up. The treatment for schwannoma is surgical excision of the lesion and recurrence after excision of schwannoma is rare. The final diagnosis is made after a histological examination. Differential diagnoses must be made in relation to malignant tumors and in relation to numerous benign neoformations based on epithelial and connective tissues.

사행수로에서의 유속 및 분산특성에 관한 실험적 연구

박성원,서일원,Park. Sung-Won,Seo. Il-Won 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1

General behaviors based on hydraulic characteristics of natural streams and channels have been recently analyzed and developed via various numerical models. However in the states of natural hydraulics, an experimental research must be performed simultaneously with the mathematical analysis due to effects of hydraulic properties such as meander, sediment, and so on. In this study based on 2-D advection-dispersion equation, flow and tracer experiments were performed in the S-curved meandering laboratory channel with a rectangular cross-section. The channel was equipped with instrument carriages which was equipped with an auto-traversing system to be used with velocity measuring sensors throughout the depth and breadth of the flow field. To measure concentration distribution of the salt solution was adjusted to that of the flume water by adding methanol and a red dye (KMnO4) was added to aid the visualization of the tracer cloud, the tracer was instantaneously injected into the flow as a full-depth vertical line source by the instantaneous injector and the initial concentration of the tracer was 100,000 mg/l. The secondary current as well as the primary flow pattern was analyzed to investigate the flow distribution in the meandering channels. The velocity distribution of the primary flow for all cases skewed toward the inner bank at the first bend, and was almost symmetric at the crossovers, and then shifted toward the inner bank again at the next alternating bend. Thus, one can clearly notice that the maximum velocity occurs taking the shortest course along the channel, irrespective of the flow conditions. The result of the tracer tests shows that pollutant clouds are spreading following the maximum velocity lines in each cases with various mixing patterns like superposition, separation, and stagnation of pollutant clouds. Flow characteristics in each cases performed in this study can be compared with tracer dispersion characteristics with using evaluation of longitudinal and transverse dispersion coefficients(LDC, TDC). As expected, LDC and TDC in meandering parts have been evaluated with increasing distribution and straight parts have effected to evaluate minimum of LDC and TDC due to symmetric flow patterns and attenuations of secondary flow.

분쟁광물과 미국의 관련 정책분석

박성원,김성용,김유동,Park, Sung-Won,Kim, Seong-Yong,Kim, You-Dong 대한자원환경지질학회 2014 자원환경지질 Vol.47 No.3

분쟁광물이란 특히, 콩고민주공화국(DRC)의 동부지역과 같이 분쟁지역에서 채굴되는 광물에 대하여 부르는 용어이다. 보통 분쟁광물이란 주석, 콜탄(컬럼바이트-탄탈라이트), 중석, 금과 같은 광물로 주로 콩고민주공화국(DRC)의 동부지역에서 채굴되고 있는 광물로서, 이러한 분쟁광물은 여러 가지 전자기기의 제조에 사용되고 있다. 콩고민주공화국(DRC)과 이웃 나라에서 분쟁을 종식시키기 위해 자금원이 되어왔던 분쟁광물의 개발이나 교역의 근원을 차단시키고 분쟁국에 있어서 무장그룹에 의한 분쟁을 억제시킬 필요가 있다. 미국 증권거래위원회(Securities and Exchange Commission, SEC)는 2012년 8월 22일 금융규제개혁법 제 1502조에 근거하는 규칙을 채택하였는데, 이 법에 따라 미국 기업들은 증권거래위원회에 분쟁광물을 이용하여 제품을 생산할 경우 분쟁광물의 원산지에 대한 보고를 하여야 한다. 이 법은 분쟁 광물의 원산지를 추적하여 특히, 분쟁 광물의 자금원이 되고 있는 콩고 민주공화국을 필두로 분쟁국에 있어서의 무장세력의 직 간접 자금원을 끊어 분쟁을 억제하는 것을 그 목적으로 하고 있다. Conflict minerals refer to minerals mined in conditions of armed conflict, especially as in the eastern provinces of the Democratic Republic of the Congo. The common conflict minerals are cassiterite, wolframite, coltan(columbite-tantalite ore), and gold, which are mined and extracted from the Eastern Congo. These minerals are essentially used in the manufacture of a variety of devices, including consumer electronics. To end the violent conflict in the Democratic Republic of the Congo (DRC) and in surrounding countries, it is necessary to block the supply route of conflict minerals which has been partially financed by the exploitation and trade of conflict minerals. The Dodd-Frank Wall Street Reform and Consumer Protection Act, passed into law in July 2010 and it contains requirements that U.S. companies report to the Securities and Exchange Commission(SEC) on the origin of conflict minerals and show due diligence of OECD. The goal of the act is to cut direct and indirect funding of armed groups engaged in conflict.

우즈베키스탄 지라블락 광화대의 광물자원 부존 현황

박성원,지세정,Park, Sung-Won,Chi, Se-Jung,Pinazarov, Majeed M. 대한자원환경지질학회 2010 자원환경지질 Vol.43 No.6

우즈베키스탄 세베로-투르크스탄스키 광화대의 지질과 광화작용

박성원,지세정,Park, Sung-Won,Chi, Se-Jung,Pinazarov, Majeed M. 대한자원환경지질학회 2011 자원환경지질 Vol.44 No.6

지하주차장에서 자연환기구의 위치 및 형태에 따른 환기효율 평가에 관한 연구

박성원(Sung-Won Park),조성우(Sung-Woo Cho),이경희(Kyung-Hee Lee) 한국생활환경학회 2009 한국생활환경학회지 Vol.16 No.3

The purpose of this study is to verify validity of natural ventilation system on underground parking area. CFD simulation is performed to investigate air velocity and air age in underground parking area by traffic type, ventilator type and location. The air velocity and air age of one-way traffic type is better than those of facing traffic type. The ventilation rate in underground parking area using natural ventilation system showed 0.216 ㎥/s, 0.0378 ㎥/s and 0.0094 ㎥/s by cases. Therefore, It could be possible to achieve legal ventilation rate using natural ventilation system.

MIN에 기반을 둔 이중 반얀 스위치의 성능 개선

박성원(Park sung-won),이창범(Lee chang-bum) 한국통신학회 2002 한국통신학회 학술대회논문집 Vol.2002 No.7

CAN 네트워크의 시간동기를 위한 IEEE1588 구현

박성원(Sung-won Park),김인성(In-sung Kim),이동익(Dongik Lee) 한국통신학회 2014 韓國通信學會論文誌 Vol.39 No.2(네트워크)

본 논문에서는 CAN(Controller Area Network)의 시간동기를 위한 IEEE1588 알고리즘의 구현에 관한 연구결과를 제시한다. 시간동기는 네트워크 기반 임베디드 시스템의 안정성, 효율, 신뢰성 개선 측면에서 매우 중요하다. 최근 전용 칩을 이용하는 IEEE1588 표준이 Ethernet 기반 임베디드 시스템의 시간동기에 폭넓게 적용되고 있다. IEEE1588과 같은 표준화된 시간동기 기법은 기존의 ‘in-house’ 시간동기 기법에 비해 많은 장점들을 제공하지만, CAN을 위한 IEEE1588 전용 칩은 현재까지 상용화된 제품을 찾아보기 어렵다. 본 논문에서는 전용 칩을 사용하지 않고 소프트웨어와 CAN 메시지만을 이용하여 IEEE1588 알고리즘을 구현한다. 제안된 방법의 효용성을 확인하기 위해 간단한 모델을 이용하여 추정한 동기정밀도와 실험용 네트워크를 통해 측정한 동기정밀도를 비교분석 한다. In this paper, an IEEE1588 based clock synchronization technique for CAN (Controller Area Network) is presented. Clock synchronization plays a key role to the success of a networked embedded system. Recently, the IEEE1588 algorithm making use of dedicated chipsets has been widely adopted for the synchronization of various industrial applications using Ethernet. However, there is no chipset available for CAN. This paper presents the implementation of IEEE1588 for CAN, which is implemented using only software and CAN packets without any dedicated chipset. The proposed approach is verified by the comparison between the estimated synchronization precision with a simple model and the measured precision with experimental setup.

와류방지장치 형상에 따른 흡입구 주변 흐름 특성에 관한 실험연구

박성원(Park, Sung Won),이동섭(Rhee, Dong Sop),김형준(Kim, Hyung-Jun) 대한토목학회 2016 대한토목학회 학술대회 Vol.2016 No.10