예견퍼지 알고리즘을 사용한 트럭-트레일러의 자율주차 제어 시스템에 관한 연구

손준익,박희경,박재현,강신출,임영도 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1

본 논문에서는 예견퍼지 알고리즘을 사용하여 트럭-트레일러의 자율주차 제어 시스템의 시뮬레이션을 행한다. 트럭-트레일러의 전·후진 동특성 방정식을 설정하여 예견퍼지 제어기의 설계시에 사용하고, 새상 시스템으로도 사용한다. 제안한 알고리즘으로 시뮬레이션을 통해서 일정 지역내의 임의의 출발점에서 적절한 도중목표를 설정하여 전후진을 하면서 핸들조작 횟수가 적게 최종목표 위치에 잘 주차됨을 입증하였다.

승객용 엘리베이터 와이어로프의 유효수명 및 교체시기 평가

손두익,박재석,오환섭 한국안전학회 2003 한국안전학회지 Vol.18 No.4

The wire rope, one of the component of the elevator, is extremely important for the safe operation of the elevator. That is why the wire rope is replaced at a specific interval regardless of the operating conditions or the degree of damage to prevent the breakage of the wire rope. This is the waste of resources, causing economic and environmental loss. This paper has surveyed and analyzed the status of replacing wire-rope by buildings that use elevators, in order tc compare the replacement cycles of the wire rope under each operating conditions.

브랜드아파트의 차별화 계획요소에 대한 거주자의 선호도 조사연구

배정익,손재룡,이경회 대한건축학회 2003 대한건축학회논문집 Vol.19 No.9

Since the middle of the 1990's, the domestic apartment market is not focused on the differential architectural design factors or the preference of consumer's needs but on which company builds the apartment housings. This structure is needed for a new change by the reasons of the decontrolling price of domestic apartment housings and the IMF (International Monetary Fund), which caused the stagnation of housing. In this processing, brand strategy is added and simultaneously differentiation of design factors are added as a part of brand strategies. This study investigated residents’ preferences focusing on architectural design factors used in the marketing strategy of brand apartment housings. And based on such results of survey the further directions of architectural design factors are suggested in the 4th. In conclusion, it is found that the brand apartment housing residents evaluate standards on apartment housing differently than standards in the past. That is, moving away from the basis of orientation and the floor to focusing of living space design can be interpreted. In order to develop the differentiation of architectural design factors we have to subdivide different design factors into detail areas and then studies of design factors should be continuously conducted.

자동차 주유시 증발 가스 방출량 예측 연구

박재성,유홍선,손동연,김충익 중앙대학교 생산공학연구소 1998 생산공학연구소 논문집 Vol.7 No.1

자동차 주유시 대기중으로 빠져 나온 연료 증기는 환경을 오염시킨다. 주유시 연료증기 방출량을 최소화하기 위해서 ORVR 시스템이 적용된다. 그러나 이 시스템은 몇가지 어려운 기술적인 문제들이 존재한다. 본 연구에서는 주유 유량에 따른 연료 증기 방출량을 예측하였다. 이를 위하여 연료 탱크의 압력 변화, 연료 증기가 흡착되는 캐니스터로의 방출량을 시뮬레이션하였다. 연료 증기와 공기의 혼합 기체는 이상기체로 가정될 수 있다. 주유관을 흐르면서 액체 연료의 압력 강하는 유량과 주유관의 형상에 따라 각각 계산하였다. 압력 강하 검증을 위해서 직선관과 90도 곡관에 대해서 수행하였다. 또한 shut-off time을 예측하여 실험치와 비교를 하였다. 계산 결과 40 LPM 이하에서는 연료탱크가 가득 찰 때까지 주유가 되고, 이상에서는 매우 빠른 시간에 shut-off가 됨을 알 수 있었다. 더 나은 모델을 개발하기 위해서는 연료의 증발, 응축 그리고 연료 탱크내의 기체의 유동까지도 고려되어야 할 것이다. During the refueling process of automobiles, the fuel vapor escapes into the atmosphere and pollutes the environment. To reduce the fuel vapor emission during refueling, ORVR(Onboard Refueling Vapor Recovery) system is implemented. This system, however, needs to overcome several technical difficulties. This research studies the problem of the fuel vapor emission and the refueling flow rate in ORVR system. The pressure variation of the fuel tank during the refueling and the emission to the canister that absorbs the escaping fuel vapor are numerically simulated. The fuel-vapor and air mixture in gas phase is assumed to be ideal gas mixture. The pressure drop of liquid fuel through the refueling line is numerically calculated for various flow rates and shapes of the pipes. The results are verified for straight and 90 degree bend. The shut-off time is calculated and compared with experimental results. The flow rate of forty liter per minute is determined to be the critical refueling rate. Below 40 LPM the refueling process continues until the tank is filled, but above it the shut-off occurs at the early stages of refueling process. Experimental results and simulation results show good agreement. To improve the model, the transient evaporation and condensation are to be considered as well as the gaseous flow inside the tank.

蛇行 河川에서 洪水波의 傳達 特性 解析

朴在弘,孫廣翼,韓健淵 경북대학교 산업기술연구소 1993 産業技術硏究誌 Vol.21 No.-

Unsteady flow in a natural river which meanders through a wide flood plain is complicated by large differences in hydraulic resistance and cross sectional geometry of the river channel and the floodplain. The unsteady flow is further complicated by the tendency for a portion of the flow to short-circuit along the more direct route afforded by the flood plain rather than following the longer route along the meandering channel. A mathmetical model for routing floods in meandering river with floodplains is presented. The one-dimensional equations modified such that the flow in the meandering channel and floodplain are identified separately. The floodplain model has been used to simulate flow in an idealized meandering river with a flood plain. Flood peak attenuation and travel time are found to increase as flood-plain roughness and width increase and as channel sinuosity decrease. Attenuation increase and travel time decreases as the flood plain flow increases.

Selective Muscle Activation With Visual Electromyographic Biofeedback During Scapular Posterior Tilt Exercise in Subjects With Round-Shoulder Posture

Jae ik Son,One bin Lim,Hae rim Han,Heon seock Cynn,Chung hwi Yi 한국전문물리치료학회 2015 한국전문물리치료학회지 Vol.22 No.4

The purpose of this study was to investigate the effects of visual electromyography (EMG) biofeedback on the EMG activity of the lower trapezius (LT), serratus anterior (SA), and upper trapezius (UT) muscles, the LT/UT and SA/UT EMG activity ratios, and the scapular upward rotation angle during scapular posterior tilting exercise (SPTE). Twenty-four subjects with round-shoulder posture participated in this study. The EMG activities of the LT, SA, and UT were collected during SPTE both without and with visual EMG biofeedback. The scapular upward rotation angle was measured at the baseline, after SPTE without visual EMG biofeedback, and after SPTE with visual EMG biofeedback. The LT, SA, and UT EMG activities, and the LT/UT and SA/UT EMG activity ratios were analyzed by paired t-test. The scapular upward rotation angle was statistically analyzed using one-way repeated analysis of variance. If a significant difference was found, a Bonferroni correction was performed (p=.05/3=.017). The EMG activities of LT and SA significantly increased, and the EMG activity of UT significantly decreased during SPTE with visual EMG biofeedback compared to SPTE without visual EMG biofeedback (p<.05). In addition, the LT/UT and SA/UT EMG activity ratios significantly increased during SPTE with visual EMG biofeedback compared to SPTE without visual EMG biofeedback (p<.05). Significant increases were found in the scapular upward rotation angle after SPTE without and with visual EMG biofeedback compared to baseline (p<.017), and no significant differences were observed in the scapular upward rotation angle between SPTE without and with visual EMG biofeedback. In conclusion, SPTE using visual EMG biofeedback may be an effective method for increasing LT and SA activities while reducing UT activity.

Microstructure and Thermoelectric Properties of Rapidly Solidified and Hot Pressed N-Type 95% Bi₂Te₃-5%Bi₂Se₃ Alloys

Son, Hyeon Taek,Oh, Ik Hyun,Lee, Jae Seol,Kang, Chang Seog,Cho, Jae Ik,Bae, Jung Chan Trans Tech Publications, Ltd. 2007 Materials science forum Vol.539 No.-

의용 전자파 영상을 위한 MoM 기반 Born 반복법의 적용

손재기(Jae-Gi Son),김보라(Bo-Ra Kim),이택경(Taek-Kyung Lee),손성호(Seong-Ho Son),전순익(Soon-Ik Jeon),이재욱(Jae-Wook Lee) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.4

본 논문에서는 전자파를 이용하여 인체 내 암 조직을 찾아내기 위해 역산란 방법인 BIM(Born Iterative Method)을 이용한 알고리즘으로 구현하였다. Born 반복법을 이용하여 2차원 유방암 진단에 적용하였으며, 전자파 산란 해석에는 적분방정식과 2차원 그린함수를 이용한 MoM(Method of Moment)을 이용하였다. 또한, 유방암 진단에 있어 적용된 역산란 알고리즘의 계산 결과를 확인하고, 암진단 의료기기로의 적용가능성과 알고리즘 사용에 제한을 분석하였다. In this paper, we used MOM-based BIM(Born Iterative Method) algorithm to implement the inverse scattering for the detection of cancer. We adopted two-dimensional breast structure, integral equations and two-dimensional Green"s function is solved with MoM(Method of Moment) to analyzing electromagnetic scattering phenomena. In addition, verifying the calculation of developed inverse scattering algorithm and analyzing medical applicability and limitations of the algorithm.

Microstructure and Texture Evolution during Large Strain Hot Rolling of AZ31 Mg Alloy

Lee, Jae Seol,Son, Hyeon Taek,Oh, Ik Hyun,Cho, Jae Ik,Kang, Chang Seog,Bae, Jung Chan Trans Tech Publications, Ltd. 2007 Materials science forum Vol.539 No.-

<P>The aims of this study ares to investigate the microstructure evolution of AZ31 Mg alloys with normal rolling and cross rolling during the large strain hot rolling affects microstructure, texture and mechanical properties of AZ31 Mg alloy. In the microstructures of as-rolled both samples, twins are clearly apparent, small and recrystallized grains are visible along some grain boundary and twinned regions. The lankford values of large strain cross rolled sample obviously demostrate the higher average r-value and lower planar anisotropy value. The press formaility of large strain rolled Mg alloy might be improved due to control of texture and grain size by change of the rolling direction.</P>

New Hybrid Hole Extraction Layer of Perovskite Solar Cells with a Planar p–i–n Geometry

Park, Ik Jae,Park, Min Ah,Kim, Dong Hoe,Park, Gyeong Do,Kim, Byeong Jo,Son, Hae Jung,Ko, Min Jae,Lee, Doh-Kwon,Park, Taiho,Shin, Hyunjung,Park, Nam-Gyu,Jung, Hyun Suk,Kim, Jin Young American Chemical Society 2015 The Journal of Physical Chemistry Part C Vol.119 No.49

<P>We report a highly efficient p–i–n type planar perovskite solar cell with a hybrid PEDOT/NiO<SUB><I>x</I></SUB> hole-extraction layer. It has been found that the perovskite solar cell with a NiO<SUB><I>x</I></SUB> thin film as a hole-extraction layer generally exhibits lower fill factor compared to the conventionally used PEDOT:PSS thin film, whereas it shows higher photocurrent and photovoltage. The fill factor of the NiO<SUB><I>x</I></SUB>-based perovskite solar cell can be significantly improved by treating the NiO<SUB><I>x</I></SUB> surface with a dilute PEDOT solution. The photoluminescence quenching study and impedance spectroscopic (IS) analysis have revealed that the hole injection at the perovskite/NiO<SUB><I>x</I></SUB> interface is significantly facilitated with the PEDOT treatment, which should lead to the increased fill factor. As a result, the p–i–n type planar perovskite solar cell with the new hybrid hole-extraction layer exhibits a high conversion efficiency of 15.1% without the hysteresis effect.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2015/jpccck.2015.119.issue-49/acs.jpcc.5b09322/production/images/medium/jp-2015-093225_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/jp5b09322'>ACS Electronic Supporting Info</A></P>