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        • KCI등재

          순환식 병류형 곡물건조기 개발(II)-시뮬레이션모델의 검증-

          한재웅,금동혁,김훈,홍상진 한국농업기계학회 2007 바이오시스템공학 Vol.32 No.5

          This study was performed to develop a simulation model of circulating concurrent-flow rice dryer. The simulation model consists of drying model, tempering model and crack prediction model. The drying and tempering models were developed based on mathematical analysis, and the crack prediction model was developed by thin layer drying tests. Rice drying tests were done with three replications by use of a pilot scale dryer of holding capacity of 700 kg. Experimental values for moisture content, rice temperature, rice crack, and drying energy were compared with predicted values by simulation model. The RMSEs of predicted moisture contents were ranged from 0.5807%(d.b.) to 1.1951%(d.b.). and the coefficients of determination were 0.9688 to 0.9812. The RMSEs of predicted rice temperatures at the exit of the drying chamber were 1.83 to 3.81℃ and the coefficients of determination were 0.8834 to 0.9482. The results for moisture contents and rice temperatures showed very good relationships between predicted values and experimental values. The RMSEs of predicted value of crack ratio were 0.4082 to 0.7967% and the coefficients of determination were 0.8742 to 0.9547. 다음과 같다.1. 순환식 병류형 건조기의 시뮬레이션 모델에 의한 예측함수율의 RMSE는 0.58~1.2% (d.b), 결정계수는 0.9688~0.9812로 높게 나타났다..

        • 회절격자 반주기의 상관관계가 있는 랜덤 변이가 ${\lambda}/4$ 위상천이 DFB 레이저 특성에 미치는 영향

          한재웅,김상배,Han, Jae-Woong,Kim, Sang-Bae 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.8

          회절격자의 인접한 반주기 길이 사이에 음의 상관관계가 있는 회절격자 반주기의 랜덤 변이가 QWS-DFB 레이저의 특성에 미치는 영향을 유효 굴절률 전달 매트릭스 방법을 이용하여 해석하였다. 상관계수가 0에서 -1로 가까이 감에 따라 랜덤 변이에 의한 회절격자 주기의 오차가 감소하면서 단일모드 안정성과 파장 정확도의 저하가 덜 심각해진다. 이는 랜덤 변이의 크기가 같다면 상관관계가 없는 전자빔 lithography 법으로 회절격자를 만들기보다는 optical lithography 법으로 만드는 것이 회절격자 주기 랜덤 변이의 영향을 줄이는 데에 유리함을 의미한다. 그리고 전자빔 lithography를 이용하여 DFB 레이저를 만들 때에 랜덤 변이의 영향을 줄이려면 분해능을 높이거나, 인접 반주기 길이의 랜덤 변이에 음의 상관관계를 주어야 한다. Effects of the correlated random fluctuation in each grating half-period have been studied by an effective index transfer matrix method in quarter wavelength shifted DFB lasers. As the correlation coefficient changes from 0 to -1, single mode stability and wavelength accuracy are less degraded by the reduced error in the grating period. This fact shows that holographic grating fabrication is better than electron-beam lithography in discrete device fabrication provided that the magnitude of the random fluctuation is the same.

        • 회절격자 주기의 랜덤 변이가 DFB 레이저 특성에 미치는 영향

          한재웅,김상배,Han, Jae-Woong,Kim, Sang-Bae 대한전자공학회 2000 電子工學會論文誌-SD (Semiconductor and devices) Vol.37 No.8

          회절격자 주기의 랜덤 변이가 DFB 레이저의 특성에 미치는 영향을 유효 굴절률 전달 매트릭스 방법을 이용하여 해석하였다. 레이저의 양 거울면은 완전 무반사 처리되었다고 가정하였으며, 회절격자 주기의 변이는 Gaussian 랜덤 변수로 표현하였다. 회절격자 주기의 랜덤 변이는 균일 회절격자 DFB 레이저와 QWS-DFB 레이저 스펙트럼의 대칭성을 깨뜨리고 유효 결합계수를 감소시킨다. 이에 따라 균일 회절격자 DFB 레이저에서는 ${\pm}$1모드 거울면 손실의 평균값이 증가하고 금지 대역폭이 감소하며, QWS-DFB 레이저에서는 단일모드 안정성과 파장 정확도가 저하된다. QWS-DFB 레이저의 거울면 손실 차이는 결합계수에 관계없이 회절격자 주기의 랜덤 변이가 카짐에 따라 감소하고, spatial hole-burning 효과는 정규화된 결합계수가 1.5보다 클 때에는 주는 데 반하여 작을 때에는 커진다. Effects of the random fluctuation in grating half-period have been studied by an effective index transfer matrix method in DFB lasers. The laser facets are assumed to be perfectly antireflection coated, and the period fluctuation is modeled as a Gaussian random variable. The random fluctuation breaks spectral symmetry in both uniform-grating and quarter-wavelength -shifted(QWS) DFB lasers, and decreases the effective coupling coefficient. This leads to increased average mirror loss of ${\pm}$1 modes and reduced stopband width in uniform grating DFB lasers, and degradation in the wavelength accuracy and the single mode stability in QWS-DFB lasers. Threshold gain difference decreases with increasing period fluctuation irrespective of grating coupling coefficient in QWS-DFB lasers, while spatial hole-burning effect is exacerbated or alleviated when the normalized coupling coefficient is lower and higher than 1.5, respectively.

        • KCI등재

          Feasibility of Applying Conductive Heat and Convective Heat to the Drying Process of Safe Solar Salt

          한재웅,김웅,이효재 한국농업기계학회 2019 바이오시스템공학 Vol.44 No.4

          This study investigated drying characteristics for the production of safe solar salt. The drying characteristics were measured and analyzed at 10-min intervals by drying at 50, 75, and 100 °C for approximately 30 min using three dry heat sources, such as conductive heat (hereafter CDH), convective heat (hereafter CVH), and conductive and convective heat (hereafter CDCVH). The characteristics measured were moisture content, salinity, whiteness, b* (yellowness), and energy consumption. Moisture content tends to decrease with increasing drying time. In particular, the drying rate of the drying method using CDCVH was most rapid (1.22%, w.b./h). The deviation of the moisture content was further increased by using the CVH method. Salinity and whiteness were not significantly different for every experiment. Otherwise, the deviation of the b* value of the drying experiment using the CDCVH was largest. Energy consumption using the CVH method was similar to the drying method using CDCVH, but the cost of the heat generator for the drying method using the CDCVH was more expensive. Therefore, considering the deviation of moisture content after drying, the cost of the heat generator, and the change of the appearance quality (b* value), the drying method using the CVH was most suitable.

        • KCI등재

          Biomechanical Analysis of Chin Tuck Exercise with a Subject-Specific Neck Model for the Forward Headed

          한재웅,김권희,배태수,Krystyne Blaikie 한국정밀공학회 2018 International Journal of Precision Engineering and Vol.19 No.4

          There are various correctional exercise methods for forward head posture (FHP) with insufficient scientific criteria for the best choices. The purpose of this research was to understand the biomechanical effect of the chin tuck exercise on FHP, focusing on the major neck extensor muscles splenii and the major flexor muscle with musculoskeletal dynamics analysis software SIMM. Subjects are divided into two groups: normal head posture (NHP) and FHP. Kinematic alignment of the cervical spine model of each subject in the FHP group was modified according to the medical images of each subject. A motion analysis system was used to obtain the trajectories of the cervical spine during the chin tuck exercise. Inverse dynamics analysis was performed for the chin tuck exercise to compare muscle forces, intervertebral joint forces, and torques between the two groups. For the FHP group, average muscle forces were approximately 33% of those of the NHP group. Average joint forces and torques of the FHP group were approximately 38.0% and 20.2% higher during protraction and 36.1% and 25.3% lower during retraction, respectively, than the NHP group. From the present analysis, the therapeutic effects of the chin tuck exercise on FHP might be inferred. This study suggests that inverse dynamics analysis with a subject-specific musculoskeletal model might be useful to estimate the correctional effects of various exercises.

        • KCI등재

          Association Between a Close Distal Resection Margin and Recurrence After a Sphincter-Saving Resection for T3 Mid- or Low-Rectal Cancer Without Radiotherapy

          한재웅,이민재,박하경,신재호,하태권,김광희,배기범,김태현,최창수,오상훈,오민경,강미선,홍관희,안민성 대한대장항문학회 2013 Annals of Coloproctolgy Vol.29 No.6

          Purpose: To maintain the patient’s quality of life, surgeons strive to preserve the sphincter during rectal cancer surgery. This study evaluated the oncologic safety of a sphincter-saving resection with a distal resection margin (DRM) <1 cm without radiotherapy in T3, mid- or low-rectal cancer. Methods: This retrospective study enrolled 327 patients who underwent a sphincter-saving resection for proven T3 rectal cancer located <10 cm from the anal verge and without radiotherapy between January 1995 and December 2011. The oncologic outcomes included the 5-year cancer-specific survival, the local recurrence, and the systemic recurrence rates. Results: In groups A (DRM ≤1 cm) and B (DRM >1 cm), the 5-year cancer-specific survival rates were 81.57% and 80.03% (P = 0.8543), the 5-year local recurrence rates were 6.69% and 9.52% (P = 0.3981), and the 5-year systemic recurrence rates were 19.46% and 23.11% (P = 0.5750), respectively. Conclusion: This study showed that the close DRM itself should not be a contraindication for a sphincter-saving resection for T3 mid- or low-rectal cancer without radiotherapy. However, a prospective randomized controlled trial including the effect of adjuvant therapy will be needed.

        • KCI등재

          System Design and Performance Analysis of a Variable Frequency LED Light System for Plant Factory

          한재웅,강태환,이승기,한충수,김웅 한국농업기계학회 2014 바이오시스템공학 Vol.39 No.2

          Purpose: The purpose of this study was to design a variable frequency LED light system for plant factory which combinedred, blue, green, white, and UV lights and controlled the ratio of the light wavelength. In addition, this study evaluated theperformance of each combination of LED to verify the applicability. Methods: Four combinations of LED (i.e. Red+Blue,Red+Blue+Green, Red+Blue+White, Red+Blue+UV) were designed using five types of LED. The system was designed tocontrol the duty ratio of each wavelength of LED by 1% interval from 0~100%, the pulse by 1Hz interval from 1~20kHz. Response characteristics of the control system, spectral distribution of each combination, light uniformity and uniformityratio were measured to test the performance of the system. Results: Clean waveforms were measured from 10Hz to 10kHzregardless of duty ratio. Frequency distortion was observed within 5% of inflection point at frequencies above 10kHzregardless of duty ratio, but it was judged negligible. Spectra showed a normal distribution, and maximum PPF with dutyratio of 100% was 271.4즗mol좪m-2좪s-1 for the Red+Blue combination. PPF of the Red+Blue+Green combination was 258.9즗mol 좪m-2좪s-1, and that of the Red+Blue+White combination was 273.9즗mol좪m-2좪s-1. PPF of the Red+Blue+UV combination was267.7 즗mol좪m-2좪s-1. Uniformity ratio for the area excepting border showed 0.90 for the Red+Blue and Red+Blue+Whitecombinations, 0.87 for the Red+Blue+Green combination, and 0.88 for the Red+Blue+UV combination. The light wasirradiated evenly at the area excepting border, so it was suitable for plant growing. Conclusions: From the results of thisstudy, response characteristics of the control system, spectral distribution of each combination, light uniformity anduniformity ratio were suitable for applying into the plant factory.

        • KCI등재

          특허 기반 블록체인 기술 동향 분석: 기술 재정의 프로세스를 바탕으로

          한재웅,금영정 한국경영공학회 2021 한국경영공학회지 Vol.26 No.1

          [Purpose] Blockchain technology is becoming important in the fourth industrial revolution, but standardization of technologies is not keeping up with the pace. Therefore, this paper focused on defining what blochchain technology is, and analyzed technological trends using redefined concepts. [Methods] This research conducted a technical redefining process for blockchain technology, and suggested three types of blockchain technology: core, extended, and general. We used patent co-classification and network analysis for each technology groups. [Results] Blockchain technology has been evolved from network-based technology to the data privacy and payment-application, recently focusing on data applications. Machine learning technology is actively applied, and many different industries such as healthcare applications also turned out to be increasing with respect to the blockchain technology. [Conclusion] This study provide important clues in defining the blockchain technology, analyzing the technological trend, and identifying possible innovation chances in blockchain technologies.

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