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.

Disciplinary Sport for All : 한국과 일본의 사회체육에 관한 비교연구

강정호,남동현 ( Jung Ho Kang,Dong Hyun Nam ) 한국체육학회 1996 국제스포츠과학 학술대회 Vol.1996 No.1

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

목적: 전위성 쇄골 간부 골절의 치료로 관혈적 정복술 후 LCP를 사용하여 내고정을 시행한 환자를 대상으로 방사선학적, 임상적 결과를 분석하여 전위성 쇄골 간부 골절의 치료에 있어서 LCP의 유용성을 알아보고자 하였다. 대상 및 방법: 2003년 5월부터 2004년 11월까지 본원에서 쇄골 간부 골절에 대해 LCP를 이용한 관혈적 정복, 금속내 고정술을 시행하고 6개월 이상 추시가 가능하였던 26례를 대상으로 하였다. 수술 후 최종 평가는 방사선 결과와 fang s criteria를 이용한 임상적 결과로 분석하였다. 결과: 수술 후 평균 9.3주에 모든 예에서 지연유합 없이 골유합 되었으며 임상적으로 Kangs criteria에 따라 구분한 결과, 우수 이 상이 22례로 나타났다. 특히, 견관절 운동은 상완골 골절이 동반된 두 경우를 제외한 24례에서 2.9주내에 정상 범위로 빠른 회복을 보였다. 합병증으로는 견관절 운동 장애 2례, 수술 절개 부위의 켈로이드 형성 1례였으며 그 이외에 다른 주요 합병증은 없었다. 결론: 전위성 쇄골 간부 골절에서 LCP를 이용한 관혈적 정복 및 금속내 고정술은 기존의 금속판에 비해 수술 후 합병증을 줄이고 효과적인 골유합과 조기 견관절 운동에 도움을 줄 수 있는 좋은 치료 방법 중 하나라고 사료된다. 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.

성인 쇄골 간부 골절에서 두 가지 수술적 치료군 간의 결과 비교: 금속판을 이용한 관혈적 정복 및 내고정술과 Steinmann Pin을 이용한 경피적 겸자 정복 및 골수강내 고정술의 결과 비교

허성식 ( Sung Sik Ha ),심재천 ( Jae Chun Sim ),홍기도 ( Ki Do Hong ),김재영 ( Jae Young Kim ),강정호 ( Jung Ho Kang ),박광희 ( Kwang Hee Park ) 대한골절학회 2007 대한골절학회지 Vol.20 No.3

목적: 성인 쇄골 간부 골절에서 금속판을 이용한 관혈적 정복 및 내고정술과 Steinmann pin을 이용한 경피적 겸자 정복 및 골수강내 고정술의 결과를 분석하여 비교하였다. 대상 및 방법: 2002년 3월부터 2006년 1월까지 본원에서 치료한 총 68예의 쇄골 간부 골절을 대상으로 하였으며, 금속판을 이용한 33예, Steinmann pin을 이용한 35예의 치료 결과를 분석하였다. 최종 결과 판정은 강 등의 기준에 의한 임상적 결과와 방사선학적 골유합 기간으로 하였고, 수술 시간을 비교하였다. 결과: 임상적 결과는 우수 이상의 예가 금속판을 이용한 군의 경우 총 33예 중 29예로 88%, Steinmann pin을 이용한 군의 경우 총 35예 중 32예로 91%의 결과를 보였다. 방사선학적 골유합 시기는 각각 평균 8.9주와 9.1주였고, 수술 시간은 금속판 군에서 평균 72분, Steinmann pin 군에서 평균 18분이었다. 결론: 성인 쇄골 간부 골절의 치료에 있어 금속판을 이용한 수술 군과 Steinmann pin을 이용한 수술 군은 임상적, 방사선학적 결과 면에서 통계학적으로 큰 차이를 보이지 않았으나, Steinmann pin을 이용한 수술 군에서 수술 시간 및 회복기간의 감소로 인하여 경제적인 면과 수술반흔의 감소에 따른 미용적인 면에서 더 만족스런 결과를 보였다. 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.

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.

하이드레이트 펠릿의 비평형 분해과정 수치해석

강정호(Jung Ho Kang),남진현(Jin Hyun Nam),김찬중(Charn-Jung Kim),송명호(Myung Ho Song) 한국전산유체공학회 2008 한국전산유체공학회지 Vol.13 No.4

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.

고분자 전해질 연료전지의 다공 전달층 내부 모세관 물 전달에 대한 공극 네트워크 해석

강정호(Jung Ho Kang),이승훈(Seung Hun Lee),남진현(Jin Hyun Nam),김형민(Hyung Min Kim) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.10

본 논문은 고분자 전해질 연료전지에서의 전극 침수(electrode flooding) 현상에 대한 이해와 물 관리의 개선을 목표로 전극을 구성하는 소수성 다공 전달층(PTL) 내부에서 물의 모세관 전달 과정을 연구하였다. 공극 크기가 상이한 미세 다공층(MPL)과 기체 확산층(GDL)으로 구성된 다공 전달층에서의 물의 미세 전달 현상을 해석하기 위하여 정상 상태 다층(multi-layer) 공극 네트워크 모델을 개발하였다. 또한, 다공 전달층 내의 정상 상태 수분 포화도가 얻어진 이후 물이 포함된 공극 네트워크를 통한 기체확산 계산이 추가적으로 수행되었다. 해석 결과는 미세 다공층의 두께가 증가함에 따라 활발한 모세관 핑거링(capillary fingering)에 의해 물 전달 경로의 병합이 용이해지며 그 결과로 미세 다공층에서의 물 배출(breakthrough) 지점의 개수와 기체 확산층에서의 물의 체적 함량이 감소함을 보여주었다. 또한, 다층다공 전달층에서 최대 확산량을 얻기 위한 최적의 미세 다공층 두께가 존재함이 확인되었다. This study investigated the two-phase transport of water in hydrophobic porous transport layers (PTLs) of PEMFCs. The goal of this study is to clarify the electrode flooding phenomena and to improve water management. A steady multi-layer pore network model was developed to analyze the transport of liquid water in the PTL, which consisted of the microporous layer (MPL) and the gas diffusion layer (GDL) with different pore sizes. In addition, the gas diffusion through the partially-saturated pore network was calculated after steady water saturation distribution in the PTL was established. The results showed that a thicker MPL facilitates the merging of the water transport paths via active capillary fingering, which in turn reduces both the number of breakthrough sites out of the MPL and the water content in the GDL. It was also found that there exists an optimal MPL thickness whereby maximum diffusion rate can be achieved in the multi-layer PTLs.

기계 장비의 장단기 운용을 고려한 Long Short-Term Memory 기법에 의한 하중 인식

강정호(Jung Ho Kang) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.2

Artificial Neural Network has been developed to enable the intelligence of mechanical equipment and devices. However, research on the intelligence of mechanical structures is rare. This study examined the possibility of learning structural loads, which is an important factor in the design and analysis of machines, using long short-term memory (LSTM), which is a Recurrent Neural Network. Because the machine structure operates for a long time, the investigation of the possibility of load learning using Long Short-Term Memory with a memory function for the short and long terms can have important implications for recognizing and predicting accidents and damage during the operation period. Depending on the size of the load, the data entered sequentially tended to be related to predictive accuracy, from relatively old low loads that required long-term memory to large loads that required new and short-term memory. Because the amount of data obtained by structural analysis is insufficient for learning Artificial Neural Networks, its usefulness was confirmed by investigating the possibility of utilizing the data that amplified the data calculated as a result of the structural analysis using the stacked autoencoder.

국내 폐차산업의 회수,처리방안 개선에 관한 연구

강정호 ( Jung Ho Kang ),양광모 ( Kwang Mo Yang ),강경식 ( Kyung Sik Kang ) 한국물류학회 2005 물류학회지 Vol.15 No.2

비냉각 적외선 이미지 센서의 바이메탈 MicroCantilever 변형

강정호(Jung-Ho Kang),박영철(Young-Chul Park),이영훈(Young-Hun Lee),오승환(Seung-Hwan Oh),공형걸(Hyeung-Geol Kong),송학관(Xueguan Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11

This is a widespread requirement for low cost lightweight thermal imaging sensors for both military and civilian applications. Today, a large number of uncooled infrared detector developments are under progress due to the availability of silicon technology that enables realization of low cost IR sensor. System prices are continuing to drop, and swelling production volume will soon drive process substantially lower. The feasibility of micromechanical optical and infrared (IR) detection using microcantilevers is demonstrated. Microcantilevers provide a simple Structurefor developing single- and multi-element sensors for visible and infrared radiation that are smaller, more sensitive and lower in cost than quantum or thermal detectors. Microcantilevers coated with a heat absorbing layer undergo bending due to the differential stress originating from the bimetallic effect. This paper reports a micromachined silicon uncooled thermal imager intended for applications in automated process control. This paper presents the design, fabrication, and the behavior of cantilever for thermomechanical sensing.