• Title/Summary/Keyword: Operating profile

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Scenario based optimization of a container vessel with respect to its projected operating conditions

  • Wagner, Jonas;Binkowski, Eva;Bronsart, Robert
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.6 no.2
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    • pp.496-506
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    • 2014
  • In this paper the scenario based optimization of the bulbous bow of the KRISO Container Ship (KCS) is presented. The optimization of the parametrically modeled vessel is based on a statistically developed operational profile generated from noon-to-noon reports of a comparable 3600 TEU container vessel and specific development functions representing the growth of global economy during the vessels service time. In order to consider uncertainties, statistical fluctuations are added. An analysis of these data lead to a number of most probable upcoming operating conditions (OC) the vessel will stay in the future. According to their respective likeliness an objective function for the evaluation of the optimal design variant of the vessel is derived and implemented within the parametrical optimization workbench FRIENDSHIP Framework. In the following this evaluation is done with respect to vessel's calculated effective power based on the usage of potential flow code. The evaluation shows, that the usage of scenarios within the optimization process has a strong influence on the hull form.

Computer Simulation on Operating Characteristics of Nonvolatile SNOSFET Memory Devices (비휘발성 SNOSFET 기억소자의 동작특성에 관한 전산모사)

  • Kim, Joo-Yeon;Lee, Sang-Bae;Lee, Young-Hie;Seo, Kwang-Yell
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 1992.11a
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    • pp.14-17
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    • 1992
  • To analyze Nonvolatile SNOSFET(polySilicon-Nitride-Oxide-Semiconductor Field Effect Transistor) memory device, two dimensional numerical computer simulation program was developed. The equation discretization was performed by the Finite difference method and the solution was derived by the Iteration method. The doping profile of n-channel device which was fabricated by 1Mbit CMOS process was observed. The electrical potential and the carrier concentration distribution to applied bias condition were observed in the inner of a device. As a result of the write and the erase to memory charge quantity, the threshold voltage shift is expected. Therefore, without device fabrication, the operating characteristics of the device was observed under various the processing and the operating condition.

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Small Target Detection Using 3-dimensional Bilateral Filter (3차원 양방향 필터를 이용한 소형 표적 검출)

  • Bae, Tae-Wuk
    • Journal of Korea Multimedia Society
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    • v.16 no.6
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    • pp.746-755
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    • 2013
  • This paper presents a three dimensional bilateral filter detecting target trajectory, extracting spatial target information using two dimensional bilateral filter and temporal target information using one dimensional bilateral filter. In order to discriminate edge pixel with flat background and target region spatially and temporally, spatial and temporal variance are used for an image and temporal profile. With this procedure, background and background profile are predicted without original target through two dimensional and one dimensional bilateral filter. Finally, using spatially predicted background and temporally predicted background profile, small target can be detected. For comparison of existing target detection methods and the proposed method, the receiver operating characteristics (ROC) is used in experimental results. Experimental results show that the proposed method has superior target detection rate and lower false alarm rate.

Optimization of the Cam Profile of a Vacuum Circuit Breaker by Using Multibody Dynamics Techniques (다물체동역학기법을 이용한 진공 회로차단기의 캠윤곽 최적설계)

  • Jang, Jin-Seok;Sohn, Jeong-Hyun;Yoo, Wan-Suk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.35 no.7
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    • pp.723-728
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    • 2011
  • Since the performance of a vacuum circuit breaker (VCB) mainly depends on the spring operating mechanism, an analysis of the spring operating mechanism is required in order to improve the design of a VCB. In this study, the static stiffness of the spring was determined by using a material testing machine, and the test results were used to model the spring through computer simulation. The multi-body dynamic model of the spring was established by using the RecurDyn program. The dynamic model was verified by comparing the results of stem displacements and rotating angles of the brake shaft obtained from the simulation and from the experiments. After verification of the dynamic model of VCB, the cam profile of the VCB was optimized through multi-body dynamics simulation in order to improve the performance of the closing mechanism.

Performance Comparisons of Wavelet Based T2-Test and Neural Network in Monitoring Process Profiles (공정프로파일 모니터링에서 웨이블릿기 반 T2-검정과 신경회로망의 성능비교)

  • Kim, Seong-Jun;Choi, Deok-Ki
    • Journal of the Korean Institute of Intelligent Systems
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    • v.18 no.6
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    • pp.737-745
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    • 2008
  • Recent developments of process and measurement technology bring much interest to the online monitoring of process operations such as milling, grinding, broaching, etc. The objective of online monitoring systems is to detect process changes as early as possible. This is helpful in protecting facilities against unexpected failures and then preventing unnecessary loss. This paper investigates, when the process monitoring data are obtained as a profile, the monitoring performances of a statistical $T^2$-statistic and a feedforward neural network by using a wavelet transform. Numerical experiments using cutting force data presented by Axinte show that the proposed wavelet based $T^2$-test has an acceptable power in detecting profile changes. However, its operating characteristic is very sensitive to autocorrelation. On the contrary, compared with $T^2$-test, the neural network has more stable performance in the presence of autocorrelation. This indicates that an adaptive feature to analyze noises should be incorporated into the wavelet based $T^2$-test.

A study of the removal efficiency of acidic gas at various operating conditions using Computation Fluid Dynamics (전산유체역학을 이용한 반건식 반응기의 운전조건에 따른 산성가스제거효율에 관한연구)

  • Lee, Geon-Ju
    • Journal of the Korea Organic Resources Recycling Association
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    • v.19 no.1
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    • pp.93-101
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    • 2011
  • The modeling of SDR was carried out for the application of the solid waste incineration system. To find optimum operating condition for removal of acidic gases, computation fluid dynamic(CFD) model was used. In this study, the temperature profile of SDR(spray dry reactor) and the gas velocity profile for different models were investigated. In this model, the diameter of SDR was 3 meter and the height of SDR was 9 meter. The amount of inlet combustion gas of SDR was $6,125Nm^3/hr$ and the inlet temperature of SDR was 493 K. The amount of lime injection of SDR was 151 kg/hr. When the inlet shape of SDR was changed, the temperatur of SDR was changed and the gas velocity of SDR was 0.48 m/sec to 1.17m/sec and the outlet gas velocity of SDR was 6.9 m/sec to 7.42m/sec As a result of modeling, the average velocities in SDR and outlet were 0.489 m/sec and 7.424 m/sec, respectively, in which the temperature of outlet in SDR was 448 K.

A Study on the Characteristic Method of Wearable Robot by Mission Profile (임무유형별 착용로봇 특성화 방안 연구)

  • Dowan Cha;Kyungtaek Lee;Joongeup Kye
    • The Journal of Korea Robotics Society
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    • v.18 no.4
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    • pp.444-455
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    • 2023
  • In this report, a specialization plan for wearable robots by mission profile was investigated and analyzed to derive an application plan. The final goal of this study was to derive the operating requirements of wearable robots according to specialized plans, and to conduct a specialized study on wearable robots by mission profile through investigation/analysis of specialized plans for each mission profile. In the study, 1) Research on technology trends related to military wearable robots such as patents and papers, 2) Research/analysis of mission profiles to characterize wearable robots, 3) Analysis of wearable robot specialization plans according to mission profiles, and 4) Requirements for wearable robot operation were derived. In the first time of the study, a survey on technology trends related to wearable robots for soldiers such as patents and papers was completed, and a military consultative body was conducted to derive measures to characterize wearable robots. In addition, a survey was conducted on mission profiles, and the second time study derived Key Performance Parameters (KPP) for operational performance, core performance, and system performance based on scenarios by mission profile. However, it is revealed that the KPP derived from the research results was not covered in this paper because it was judged that more in-depth research was needed prior to disclosure. In order to prepare for future battlefield situations and increase the usability of wearable robots, this study was conducted to characterize wearable robots by considering the characteristics of soldiers' equipment according to mission profiles and to characterize wearable robots by mission profile.

Design and Implementation of GUI in CVM on Real-Time Operating System, iRTOS (실시간 운영체제에서 iRTOS에서의 CVM GUI 설계 및 구현)

  • Choi, chan-woo;Lee, cheol-hoon
    • Proceedings of the Korea Contents Association Conference
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    • 2008.05a
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    • pp.551-554
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    • 2008
  • JVM(Java Virtual Machine) has GUI(Graphical User Interface) facility and Platform Independance and is used on the embedded device such as set-top box and smart phone. This needs JVM to execute Java application in the embedded device. CVM(Classic Virtual Machine) which is the kind of JVM is designed for embedded device to have limited resources. To support GUI facility of JAVA uses PBP(Personal Basis Profile) which is included on CVM. The PBP defines the GUI Stardard API to support GUI facility. When the GUI Stardard API is implemented, JNI(Java Native Interface) is used to connect between Java Native Method and Native function in Operating System. In this pater, PBP which is defined by CVM has designed and implemented on the Real-Time Operating System, iRTOS.

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Use of HCI Program for Optimization of Operating Conditions in Analytical and Preparative Chromatography (분석 및 분리용 크로마토그래피에서 조업조건의 최적화를 위한 HCI 프로그램의 이용)

  • Lee, Ju-Won;Lee, Min-U;No, Gyeong-Ho
    • KSBB Journal
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    • v.14 no.4
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    • pp.408-413
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    • 1999
  • To separate mixtures analytically and preparatively by LC (Liquid Chormatography), the operating conditions of analytical chromatography should be determined. The HCI program was utilized to find the optimum operating condition accurately and rapidly, and to reduce the number of experiments. In an analytical chromatography, based on the resolution and analysis time, the experimental conditons of deoxyribonucleosides and phopholipids were fixed in terms of taxol was calculated, and the collection time was predicted for the mixture of 5'-IMP and 5'-GMP from the elution profile when and purity wer known.

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Design of a Modified Alford Loop Antenna for On-Body Devices (인체 부착형 기기를 고려한 변형된 Alford 루프 안테나 설계)

  • Park, Joongki;Lee, Juneseok;Choi, Jaehoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.25 no.1
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    • pp.25-31
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    • 2014
  • In this paper, a modified Alford loop antenna for on-body communication system is proposed. The proposed antenna operating in the ISM band is designed with consideration of human body effect. One of advantages of the Alford loop antenna structure is low-profile, however the Alford loop antenna is not suitable for on-body devices since it does not have a ground plane for other electronic part of on-body system and requires balanced feeding structure. To be embedded on on-body devices, the proposed antenna is design with the unbalanced feed structure and ground. The performance of the proposed antenna is simulated and measured when it is placed on the human body phantom to consider the effect of the human body. The proposed antenna a 10 dB return loss bandwidth over the ISM band and monopole-like radiation pattern with low-profile. The antenna has the surface of appropriate for on-body communication environment.