http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 박현중(Hyun Joong Park) (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
신용각(Yong Kag Shin),박현중(Hyun Joong Park),김형용(Hyung Yong Kim),정찬우(Chan Woo Jeong),고덕영(Duk Young Go),한재희(Jae Hee Han) 대한산부인과학회 1999 Obstetrics & Gynecology Science Vol.42 No.2
Uterine perforation is a serious complication in users of intrauterine devices for contraception. Authors encountered one case of displacement of Copper-T IVD into urinary blpossibly due to uterine perforation on insertion of the Copper-T IUD in a 28 year old 1-multipara, who experienced normal intrauterine pregnancy in the circumstances. This patient was in silent, asymptomatic condition and underwent cesarean section. And Copper-T IUD was removed under the cystotomy. So we report one case with brief review of literatures
-
복합 열전달 해석을 이용한 중속디젤엔진 실린더 부품 온도 분포 예측
최성욱(Seong Wook Choi),윤욱현(Wook Hyoen Yoon),박종일(Jong il Park),강정민(Jeong Min Kang),박현중(Hyun Joong Park) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Predicting engine component temperature is basic step to conduct structure safety evaluation in medium speed diesel engine design. Recent trends on increasing power density and performance required more effective thermal management of engine for the desired durability and reliability. In addition, several local temperature of engine component must be satisfied in the proper range to avoid corrosion problems such as low temperature or high temperature corrosion. Therefore, it is very important to predict temperature distribution of each engine part accurately in design stage. In this study, temperature of engine component is calculated using steady state conjugate heat transfer analysis. Proper approach to determine thermal load distribution on thermal boundary area is suggested using 1-D engine system analysis, 3-D transient CFD results and past experimental data in another developed engine model. A Hyundai HiMSEN engine having 250㎜ bore size was chosen to validate the analysis procedure. The predicted results showed a reasonable agreement with experimental results.
-
복합 열전달 해석을 이용한 중속 디젤엔진 실린더 부품 온도 분포 예측
최성욱(Seong Wook Choi),윤욱현(Wook Hyoen Yoon),박종일(Jong il Park),강정민(Jeong Min Kang),박현중(Hyun Joong Park) 대한기계학회 2013 大韓機械學會論文集B Vol.37 No.8
엔진 설계시 실린더 주요 부품의 온도 분포 계산은 엔진 전체 구조안정성 평가시 열응력에 의한 변형을 고려하기 위해 필수적으로 수행된다. 최근 박용 및 발전용 중속엔진은 압축비 및 출력이 증대 되어 설계되고 있는 추세여서 증가된 연소실 열부하에 의한 영향을 고려하기 위해 열전달 해석의 높은 정확도가 요구되고 있다. 본 연구에서는 엔진 설계시 실린더 주요 부품의 온도 분포를 계산하고 계산된 온도 수준이 설계기준에 만족하는지를 정확히 평가 하기 위한 열전달 해석 프로세스를 정립하였다. 각 주요 열부하 영역의 경계조건 설정 과정을 1 차원 엔진 성능해석 및 3 차원 열유동 해석을 통하여 산출하여 적용하였으며 해석 결과는 해당엔진 모델의 프로토 타입엔진 주요 부품 온도를 계측하여 검증하였다. Predicting the engine component temperature is a basic step to conduct structural safety evaluation in medium-speed diesel engine design. Recent trends such as increasing power density and performance necessitate more effective thermal management of the engine for achieving the desired durability and reliability. In addition, the local temperatures of several engine components must be maintained in the proper range to avoid problems such as low- or high-temperature corrosion. Therefore, it is very important to predict the temperature distribution of each engine part accurately in the design stage. In this study, the temperature of an engine component is calculated by using steady-state conjugate heat transfer analysis. A proper approach to determine the thermal load distribution on the thermal boundary area is suggested by using 1D engine system analysis, 3D transient CFD results, and previous experimental data from another developed engine model. A Hyundai HiMSEN engine having 250-mm bore size was chosen to validate the analysis procedure. The predicted results showed a reasonable agreement with experimental results.
-
안성찬(Sung Chan An),김승욱(Seung Ook Kim),김준철(Joon Cheol Kim),박승현(Seung Hyun Park),박종후(Jong Hwoo Park),박현중(Hyun Joong Park),조영우(Young Woo Jo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, we will explain the need for a virtual model so-called Digital Twin technology in the ship engine field, and the applications of the virtual models. Unlike small automobile engines, ship engines need a lot of time and cost to do experiments. The development of the virtual models in the field of ship engines is essential to get competitiveness in the ship engine business. Hyundai Heavy Industries (HHI) virtual model technology, which will be introduced in this paper, can be divided into three main areas. Virtual models are used for the following areas: engine design, engine testing, and maintenance. In engine design, a predictive model is constructed based on combustion analysis, structural analysis, and performance analysis to predict engine performance required for designing the target value. For engine testing, the total number of tests can be reduced by using virtual models to determine the direction of the test or in conjunction with existing test data to reduce time and cost. In terms of maintenance, the ship engine’s big data system is used based on numerous engine operating data accumulated so far and is used to predict failures and diagnose engines by utilizing virtual models with AI technology. Lastly, this paper will be concluded by discussing the future of virtual model technology in the ship engine field by introducing “Smart Engine 5.0” which is the future of the virtual model pursued by HHI.
-
스크린 마크 공격 : 새로운 정지영상 워터마킹 공격 기법
박현중,이충훈,이흥규 한국방송공학회 2001 방송공학회논문지 Vol.6 No.1
This paper describes a new watermarking attack algorithm, a screen mark attack. The screen mark attack is a modified overmarking attack, which attacks a watermarking system by inserting another watermark into a marked image. Overmarking attack has a problem that it cannot be applied to a public watermarking software that prohibits the watermark embedder from embedding another watermark into an already marked image. However, the proposed attack algorithm can be applied to such a public watermarking scheme. Test results show that the proposed watermarking attack algorithm is successful for commercial watermarking softwares and attacked images show better quality than images attacked by other attack tools.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
