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빙해역 영상에서 추출한 픽셀 단위 빙두께의 물리적 단위 변환
박인하(Inha Park),남종호(Jong-Ho Nam),변석호(Seokho Byun),박정서(Jungseo Park) (사)한국CDE학회 2014 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2014 No.8
Ice thickness is the major factor affecting the rapid and safe cruise of icebreaking vessels. The techniques for measuring ice thickness include direct coring by humans, electromagnetic induction equipment (EM31- MK2), and satellite(ICESat). A newly introduced method measures the ice thickness from the video clips of icebreaking scenes. This method is useful for various post-processing purposes. It utilizes an image processing technique to deal with pixel-based ice thickness. This study suggests a technique that converts the pixel unit of ice thickness to the real number. The precision of conversion is inspected by comparing the result with the measured data obtained by model test.
모바일 기기를 활용한 조선 및 해양플랜트 스마트 제조 사례
박정서 ( Park Jungseo ) 텔코경영연구원 2023 텔코 저널 Vol.11 No.0
한국의 조선사들은 제조 경쟁력을 향상시키기 위해 다양한 스마트 제조 기술을 도입하고 있다. 이 중에서도 특히 모바일 기기를 활용한 스마트 제조에 대한 연구가 활발하다. 본 기고에서는 모바일과 관련된 스마트 제조에 대해 세 가지 모바일 솔루션 개발 사례를 소개하고자 한다. 첫째는 태블릿을 통해 실시간으로 도면 및 경량 3D모델을 가시화하는 솔루션을 개발한 사례이다. 둘째는 3D 활용 측면에서 증강현실 기술을 개발해 작업지시 및 검사에서 활용한 사례이다. 마지막 사례는 모바일 기기 활용 확산을 위해 보안과 안전을 강화함으로써 개인이 보유한 스마트폰으로 도면 및 모델을 보고 작업 실적까지 입력 가능한 솔루션을 개발한 사례이다. 이를 기반으로 넓고 위험한 조선소 야드 작업 환경에서도 실시간으로 최신의 정보를 보고 실시간 실적입력을 가능하게 함으로써 향후 스마트 제조 환경을 더욱 확산할 수 있도록 하였다. Many Korean shipbuilding companies are developing various smart manufacturing technologies to improve manufacturing competitiveness. Among them, researches on smart manufacturing technologies using mobile devices are particularly active. In this article, we would like to introduce three mobile solutions for smart manufacturing cases using mobile devices. The first is a case of developing a solution for visualizing drawings and lightweight 3D models in real time using mobile devices, especially tablets. The second is a case of developing augmented reality technology and using it in work order and inspection. The last case is a case of developing a solution that allows field workers to see drawings and 3D models and input working records with their own smart-phones with strengthening security and safety to spread the use of mobile devices. Based on this, even in a wide and hard shipyard yard working environment, the latest drawings and information can be shared in real time and real-time working result input is possible, so that the smart manufacturing environment can be further spread in the future.
박정서(Jungseo Park),염기태(Kitae Yeom),장진영(Jinyoung Jang),문석수(Seoksu Moon),배충식(Choongsik Bae),박정남(Jeongnam Park),김성근(Sungkun Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A de-icing method was investigated using by heater coil wire attached conventional 4-hole Top-feed type injector for LPG(liquefied petroleum gas) liquid injection. The heat loss on the nozzle tip of injector was evaluated by measuring the input power to the heater coil wire to keep the initial temperature of nozzle tip surface. Test was conducted for various conditions of injection duration, injection interval and fuel pressure. Unexpectedly, in according to the increase of injection rate, the heat loss of nozzle tip was decreased. Considering the total heat energy balance on nozzle tip can describe these phenomena. The heat loss of nozzle tip was increased as the injection frequency is increased, while slightly smaller heat loss is observed at higher injection pressure. These results could give the basic information about the required heat energy to maintain the nozzle tip temperature as initial condition.
프로판을 이용한 소형 리니어 엔진의 효율 및 운전 특성
김재헌(Jaeheun Kim),박정서(Jungseo Park),배충식(Choongsik Bae) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The operating characteristics and efficiency of a small-sized linear engine fueled with propane for generating electricity was investigated. The bore and stroke of the engine was 20 ㎜ and 19 ㎜, respectively, resulting in total displacement of 12 ㏄ with 2 cylinders. Spark ignition system was adopted, and the mixture of propane and air was supplied to the combustion chamber. The pressure and the equivalence ratio of the mixture were varied to investigate the operating speed and combustion characteristics. Displacement sensor was used to measure the displacement of the piston and the velocity data was further derived. Pressure data inside the combustion chamber was measured with pressure transducer to study the combustion. Under the idling condition, the variation of the operation frequency was not obvious as the variation of the mixture conditions, and the operating frequency maintained around the value of 50 ㎐. The combustion of each cycle showed instability according to the variation of the IMEP(Indicated Mean Effective Pressure), and eventually resulted in large cyclic variation. The main reason of the instability was due to the uneven amount of mixture trapped in the cylinder during the scavenging process. Also, low overall fuel conversion efficiency of the engine was observed due to the low scavenging efficiency of the 2-stroke engine and certain amount of short-circuited fuel.
[가솔린엔진부문] 정적연소실내에서의 플라즈마 제트 점화에 대한 연소기간중의 열손실산정
문경태(Kyoungtai Moon),박정서(Jungseo Park),김문서(Munheon Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
In this paper, the heat loss to the constant volume vessel wall was investigated using by instantaneous heat flux sensor, schlieren visualization, pressure rise curve. And the heat loss characteristics of plasma jet ignition compared with conventional spark ignition.<br/> In case of plasma jet ignition, the flame kernel moves toward center of combustion vessel in the initial period of combustion, and the flame surface spread out to the vessel wall. However, in case of conventional spark ignition, the flame surface contact with combustion vessel wall in the initial period of combustion. As a result, heat loss in the combustion duration for conventional spark ignition increase than that of plasma jet ignition. And the combustion enhancement rate of plasma jet ignition is increase than that of conventional spark ignition, and it was found that the heat loss rate is inversely proportional to the combustion enhancement rate.<br/>
플라즈마 제트 플러그의 형상이 정적연소기내 연소특성에 미치는 영향
김문헌,유호선,오병진,박정서,Kim, Munheon,Yoo, Hoseon,Oh, Byungjin,Park, Jungseo 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.5
This paper presents combustion characteristics of LPG-air mixture ignited by the plasma jet in a cylindrical vessel with constant volume, in which our focus is placed on the multi-hole plug configuration. Four types of the plug configuration depending on the number of orifice and the arranged angle are considered, along with two cases of conventional spark ignition for comparison. Not only the flame propagation is photographed at intervals, but the pressure in the combustion chamber is also recorded through the entire combustion process. The results show that the plasma jet ignition enhances the overall combustion rate remarkably in comparison to the spark ignition by generating irregular flame front and penetrating through the unburned mixture. The combustion enhancement rate agrees favorably with the available data, which supports the validity of our experiment. Synthetically estimating, the two-hole sixty-degree plug appears to be the most desirable, in that the maximum pressure as well as the combustion duration is less affected by the sub-energy level than the others. It is also deduced that there may exist an optimal plug configuration capable of rapid combustion for a specific combustion chamber.
[가솔린엔진부문] 정적 연소기내의 스월 속도 변화에 따른 플라즈마 제트 점화의 연소특성
이주한(Juhan Lee),박정서(Jungseo Park),유호선(Hoseon Yoo),김문헌(Munheon Kim) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents the evaluation of combustion caracteristics by means of single-hole plasma jet ignitions in comparison with conventional spark ignition in according to the variation of swirl velocity. Plasma jet plug designed. three types according to ejecting directions : center of chamber, positive and negative swirl flow direction. Experiments are conducted by LPG-air mixture in a constant volume cylindrical vessel. Not only the flame propagation is photographed at intervals, but the pressure variation in the combustion chamber is a]50 recorded throughout the entire combustion process. The results show that the plasma jet ignitions and spark ignition are enhance the overall combustion rate by increasing the swirl velocity. The dependence 'of the combustion enhancement rate on the swirl velocity leads to the fact that the plasma jet plug, which eject plasma jet to the center of combustion chamber is the most desirable ignitor than other plugs.
배기 열교환기로 인해 증가한 촉매 활성화 시간 감소방안에 관한 연구
이석환(Seokhwan Lee),박정서(Jungseo Park),배충식(Choongsik Bae) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Close-coupled catalyst (CCC) can reduce the engine cold-start emissions by utilizing the energy in the exhaust gas. However, in case the engine is operated at high engine speed and load condition, the catalytic converter may be damaged and eventually deactivated by thermal aging. Excess fuel is sometimes supplied intentionally to lower the exhaust gas temperature avoiding the thermal aging. This sacrifices the fuel economy and exhaust emissions. The heat exchanger was applied in an SI engine to lower the exhaust gas temperature mainly under high load conditions. The heat exchanger was installed between the exhaust manifold and the inlet of the CCC to avoid thermal aging. The exhaust heat exchanger successfully decreased the exhaust gas temperature, which eliminated the requirement of fuel enrichment under high load conditions. The amount of exhaust emissions (HC, CO, NOx) during the cold start increased due to the increment of the catalyst light-off time. This problem could be resolved by adopting the solenoid valve to cut off the coolant at the inlet of the coolant passage of the heat exchanger. New concept of heat exchanger which is combined with the metal catalyst was tested to investigate the possibility of reducing the light-off time.