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- 저자 : 강정호(Jung Ho Kang), 서범종(Beom Jong Seo), 이숙희(Sook Hee Lee), 임흥선(Heung Sun Lim) (검색결과 181 건)
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DEVS 기반 모델링을 적용한 잠수함의 어뢰회피 성능 분석 시뮬레이션
강정호,이성준,차주환,유성진,이효광,이규열,김태완,고용석,Kang Jung-Ho,Lee Sung-Jun,Cha Ju-Hwan,Yoo Seong-Jin,Lee Hyo-Kwang,Lee Kyu-Yeul,Kim Tae-Wan,Ko Yong-Seog 한국시뮬레이션학회 2005 한국시뮬레이션학회 논문지 Vol.14 No.2
A simulation for the analysis of the evasive capability of a conventional costal submarine against a light Anti-Submarine Warfare (ASW) torpedo has been studied. The Torpedo, Submarine Controller, Devoy, and Jammer models of this simulation are analysised and designed using Unified Modeling Language (UML) and in addition they are modeled Discrete Event System Specification (DEVS). We examine maximum speed, acceleration, countermeasure systems capabilities of a submarine, and sonar range of a torpedo as the factors which affect the evasive capability of the submarine. This paper shows the relationships between those various factors and the submarine's evasive capability as the outcome of the simulation. The simulation models can be applied for simulation based acquisition (SBA) of a submarine system.
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Locking Compression Plate를 이용한 전위성 쇄골 간부 골절의 수술적 치료
정남식,홍기도,하성식,박성준,강정호,심재천,Chung, Nam-Sik,Hong, Ki-Do,Ha, Sung-Sik,Park, Sung-Joon,Kang, Jung-Ho,Sim, Jae-Cheon 대한정형외과스포츠의학회 2006 대한정형외과스포츠의학회지 Vol.5 No.1
Purpose: To assess the effectiveness of the Locking compression plate (LCP) after open reduction for the treatment of the displaced clavicular shaft fracture, the clinical and radiologic outcome of the patients who were managed with the LCP for internal fixation after open reduction has been analyzed. Materials and Methods: We reviewed 26 cases with a displaced clavicular shaft fracture treated by internal fixation using Locking compression plate after open reduction between May 2003 and November 2004. The patients were followed up for at least six months period, and final postoperative outcome was evaluated using clinical results based on Kang's criteria, radiologic signs of fusion. Results: All fractures united by an average of 9.3 weeks without delayed union and showed fast recovery of motion fraction and shoulder function. In addition,24 cases without the fractures of proximal humerus recovered to normal range of shoulder notion within 2.9 weeks. Clinically, according to Kang's criteria, the outcome was good or better in 22 patients. The complications included shoulder joint dysfunction in two cases and keloid formation in one case, and no other complications were observed. Conclusion: The internal fixation using LCP for the treatment of displaced clavicular shaft fracture is a safe, reliable method of treatment, with few complications, and offers rapid recovery of shoulder joint function and bone union.
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허성식 ( Sung Sik Ha ),심재천 ( Jae Chun Sim ),홍기도 ( Ki Do Hong ),김재영 ( Jae Young Kim ),강정호 ( Jung Ho Kang ),박광희 ( Kwang Hee Park ) 대한정형외상학회 2007 Journal of Musculoskeletal Trauma Vol.20 No.3
Purpose: To evaluate the results between open reduction and internal fixation with the plate and percutaneous reduction by towel clip and intramedullary fixation with Steinmann pin for clavicle shaft fractures in adult. Materials and Methods: We have studied the results in 33 cases with the plate. 35 cases with the Steinmann pin among total 68 cases of clavicle shaft fracture. The patients were followed up over a period of at least 12 months. The final postoperative outcome was analyzed with the clinical outcomes using Kang`s criteria. radiological union time and operation time. Results: The clinical outcome that was good or excellent according to the Kang`s criteria showed a distribution of 88% in the group using the plate with 29 cases out of total 33 cases. 91% in the group using the Steinmann pin with 32 cases out of total 35 cases. The mean radiological union time was 8.9 weeks in the group using the plate. 9.1 weeks in the group using Steinmann pin. The mean operation time was 72 minutes in the group using the plate, whereas was 18 minutes in the group using Steinmann pin. Conclusion: In the treatment of adult clavicle shaft fracture. two groups did not show a significant statistical difference in clinical and radiological outcomes. However, the operation time and postoperative functional recovery was significantly shorter and faster in the group using Steinmann pin. Additionally economic and cosmetic aspect was more satisfactory in the group using Steinmann pin.
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동일한 제조사의 하드웨어를 가진 두 장비에서 Double-Z Sampling 기법 적용 유무와 Pitch 변화에 따른 영상의 화질 비교 및 평가
강정호(Jung Ho Kang), 서범종(Beom Jong Seo), 이숙희(Sook Hee Lee), 임흥선(Heung Sun Lim) 대한CT영상기술학회 2016 대한CT영상기술학회지 Vol.18 No.2
Purpose : We tried to compare image quality by measuring noise value using pitch change and applying to Double-Z Sampling technique with 2 CT modalities which are consist of same hardware of same corporation. Materials and Methods: We used AAPM CT performance phantom (Nuclear Associates, Model 76-40), Brilliance 64 CT (Philips Healthcare, Netherlands) and Ingenuity 128 CT(Philips Healthcare, Netherlands). On phantom study, All the parameters like CTDI value are same except pitch value. We measured average and standard deviation value by using ROI analyzing function of PACS after setting 4 x 4 cm sqaure on 1/4 spot from the center of noise measurement block of AAPM phantom towards 6 o clock position. On clinical study, 30 patients who have taken Low-dose screening chest follow-up CT were chosen for this study applying to the same protocol as Low-dose chest CT in our hospital from January 2015 to December 2015. We applied different pitch values to 2 CT modalit ies. Brilliance 64 CT was 0.516 (Group1) and Ingenuity 128 CT was 1.048 (Group2). And we also set 36mm² of same ROI using ROI analyzing function of PACS and measured noise value of lung nearby rib cage and costal margin on thin section coronal plane. Statistical analysis was used to Wilcoxon signed rank Test of SPSS program(Inc. Chicago) in order to verify statistical significance of noise value measured by two groups. Result : In case of phantom study, noise value measured in Ingenuity 128 CT showed us average 5.31. It was higher than noise level measured in Brilliance 64 CT which was average 4.83. In case of clinical study, noise value of Group 1 was average 26, standard deviation 4.79 and Group 2 was average 28.86, standard deviation 6.67. As a result of Wilcoxon Signed Rank Test, P-value was 0.006 and statistically significant on the comparison of noise value between Group 1 and Group 2. Conclusion : Through this study, we found that the change of noise value showed us a few difference as pitch value increase. that is to say, noise value increase as scan hardware data acquisition following Double-Z sampling technique increase. But, it’s quite small difference that it can’t affect image quality. So we think that using Double-Z sampling is clinically useful due to advantage of getting double data acquisition.
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13.56Mhz RFID 환경에서 안전한 보안 스킴 구축을 위한 암호 스킴 및 보안 프로토콜 연구
강정호(Kang, Jung-Ho),김형주(Kim Hyung-Ju),이재식(Lee, Jae-Sik),박재표(Park, Jae-Pyo),전문석(Jun, Moon-Seog) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.3
RFID란 개체에 Micro Chip이 내장된 태그를 부착하여 리더를 통해 개체를 인식한 후 서버와의 통신을 통해 개체를 인증하는 기술을 총칭한다. 다양한 RFID 태그 중, ISO/IEC 14443 표준 기반의 NXP사의 Mifare 태그는 13.56Mhz 대역의 RFID 카드로, 전 세계 시장의 72.5%를 점유하고 있다. Mifare 태그 중, 저가 태그인 Mifare Classic 태그는 제한적인 하드웨어 연산을 기반으로 보안이 제공됨에 따라, 다양한 공격에 의해 프로토콜 노출 및 키 복구 취 약점이 발생하였다. 이에 본 논문에서는 13.56Mhz RFID 환경에서 안전한 보안 스킴 구축을 위한 암호 스킴 및 보안 프로토콜을 설계하였다. 제안하는 보안 스킴은 KS 생성 시 다양한 고정값과 비고정값을 사용하고, S-Box 연산을 수 행하며, LFSR 연산과 S-Box 연산에 사용되는 값을 교차시켜, 기존 보안 스킴의 취약점과 스푸핑, 재생 공격과 같은 일반적인 RFID 보안 요구사항을 만족한다. 또한, 제한된 하드웨어 연산 능력과 기존 보안 스킴의 연장선상에서 설계 되어, 현재 사용되는 Mifare Classic에 바로 적용 가능하다. What is RFID Microchip tag attached to an object, the reader recognizes technology collectively, through communication with the server to authenticate the object. A variety of RFID tags, 13.56Mhz bandwidth RFID card, ISO/IEC 14443 standards based on NXP's Mifare tag occupies 72.5% of the world market. Of the Mifare tags, low cost tag Mifare Classic tag provided in accordance with the limited hardware-based security operations, protocol leaked by a variety of attacks and key recovery vulnerability exists. Therefore, in this paper, Cryptography Scheme and Secure Protocol for Safety Secure Scheme Construction in 13.56Mhz RFID have been designed. The proposed security scheme that KS generated by various fixed values and non-fixed value, S-Box operated, values crossed between LFSR and S-Box is fully satisfied spoofing, replay attacks, such as vulnerability of existing security and general RFID secure requirement. Also, It is designed by considering the limited hardware computational capabilities and existing security schemes, so it could be suit to Mifare Classic now.
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강정호(Jung Ho Kang),남진현(Jin Hyun Nam),김찬중(Charn-Jung Kim),송명호(Myung Ho Song) 한국전산유체공학회 2008 한국전산유체공학회 학술대회논문집 Vol.2008 No.-
The prediction of hydrate pellet decomposition characteristics is required to design the regasification process of GTS (gas to solid) technology, which is considered as an economic alternative for LNG technology to transport natural gas produced from small and stranded gas wells. Mathematical model based on the conservation principles, the phase equilibrium relation, equation of gas state and phase change kinetics was set up and numerical solution procedure employing volume averaged fixed grid formulation and extended enthalpy method are implemented. Initially, porous methane hydrate pellet is at uniform temperature and pressure within hydrate stable region. The pressure starts to decrease with a fixed rate down to the final pressure and is kept constant afterwards while the bounding surface of pellet is heated by convection. The predicted convective heat and mass transfer accompanied by the decomposed gas flow through hydrate/ice solid matrix is reported focused on the comparison of spherical and cylindrical pellets having the same effective radius.
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고분자 연료전지의 다공성층 내에서의 액상수분 이동에 관한 공극-네트워크 해석 연구
강정호(Jung Ho Kang),이상건(Sang Gun Lee),남진현(Jin Hyun Nam),김찬중(Charn-Jung Kim) 한국전산유체공학회 2011 한국전산유체공학회 학술대회논문집 Vol.2011 No.5
Water is continuously produced in polymer electrolyte membrane fuel cell (PEMFC), and is transported and exhausted through polymer electrolyte membrane (PEM), catalyst layer (CL), microporous layer (MPL), and gas diffusion layer (GDL). The low operation temperatures of PEMFC lead to the condensation of water, and the condensed water hinders the transport of reactants in porous layers (MPL and GDL). Thus, water flooding is currently one of hot issues that should be solved to achieve higher performance of PEMFC. This research aims to study liquid water transport in porous layers of PEMFC by using pore-network model, while the microscale pore structure and hydrophilic/hydrophobic surface properties of GDL and MPL were fully considered.
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