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Modeling the Visual Target Search in Natural Scenes
Daecheol Park,Rohae Myung,Sang-Hyeob Kim,Eun-Hye Jang,Byoung-Jun Park 대한인간공학회 2012 大韓人間工學會誌 Vol.31 No.6
Objective: The aim of this study is to predict human visual target search using ACT-R cognitive architecture in real scene images. Background: Human uses both the method of bottom-up and top-down process at the same time using characteristics of image itself and knowledge about images. Modeling of human visual search also needs to include both processes. Method: In this study, visual target object search performance in real scene images was analyzed comparing experimental data and result of ACT-R model. 10 students participated in this experiment and the model was simulated ten times. This experiment was conducted in two conditions, indoor images and outdoor images. The ACT-R model considering the first saccade region through calculating the saliency map and spatial layout was established. Proposed model in this study used the guide of visual search and adopted visual search strategies according to the guide. Results: In the analysis results, no significant difference on performance time between model prediction and empirical data was found. Conclusion: The proposed ACT-R model is able to predict the human visual search process in real scene images using salience map and spatial layout. Application: This study is useful in conducting model-based evaluation in visual search, particularly in real images. Also, this study is able to adopt in diverse image processing program such as helper of the visually impaired.
박응석 ( Eungsuk Park ),김대철 ( Daecheol Kim ) 한국생산성학회 2017 生産性論集 Vol.31 No.2
In this study, we examine consumer`s intention to use the Home Energy Management System (HEMS) based on Extended Technology Acceptance Model (e-TAM). HEMS is the next generation ICT application management system and utilizes smart grid to maximize the electricity consumption efficiency for households. The HEMS provides households with the real-time information on electricity price based on the consumption of electricity and make consumers control their consumption of electricity. The proposed e-TAM includes three independent variables that might affect the usefulness of this system. These three external variables include an economic benefit, social contribution, and environmental responsibility. In addition, we consider income, age, and gender as moderate variables to examine moderating effects in the relationship between these external variables and usefulness. In detail, income has moderating effects on the relationship between economic benefits and usefulness. Age and gender have also moderating effects on the relationship between social contribution, economic responsibility, and usefulness. To analyze the model, 400 people are surveyed and 374 data are finally used for further analyses. The model proposed in this study is proven to be effective with R2 = 63.4%. The results show that both usefulness (path coefficient=.535) and ease of use (path coefficient=0.327) significantly affect intention to use of HEMS at the significance level of 0.01. That is, usefulness gives more impact on intention to use than ease of use does. Also, all external variables such as economic benefit (path coefficient=0.308), social contribution (path coefficient=0.298), and environmental responsibility (path coefficient=0.173) have statistically significant effects on usefulness at 0.01 significance level. As you can see, economic benefit turns out to be the most significant element that affects usefulness. After examining the moderating effect of income on economic benefit and usefulness, it is known that lower income group shows higher usefulness than the other group does. Thus, the lower income group shows more sensitivity to economic benefit. Moreover, age and gender have moderating effects on the relationship between the usefulness of HEMS and social contribution. That is, older female group feel higher usefulness in terms of environmental responsibility. Therefore, this study suggests that the government should consider these results to establish an appropriate advertisement strategy to make many people accept the HEMS. That is, economic benefit, as well as social contribution aspects of HEMS, should be addressed when the government prepares the program of public relations and design the functions of HEMS.
롤 다이 포밍에 의한 치형부품 제조 시 금형공차에 따른 성형성 평가
고대훈(Daehoon Ko),황성준(Sungjun Hwang),고대철(Daecheol Ko),이상곤(Sangkon Lee),권용남(Yongnam Kwon),이현석(HyunSuk Lee),박은수(Eunsoo Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The roll die forming(RDF) process is new manufacturing technique for tooth parts such as drum clutch, hub clutch in vehicle transmission. The characteristic of RDF process is to deform the material using the installed roll in the die. The qualitative benefits obtained from RDF process are the increased productivity, reduced press load and increased dimension quality. In this paper, RDF process is applied to produce the hub clutch with tooth shape part. FE-simulation is conducted to confirm the metal flow according to process. Finally, the hub clutch as test product is manufactured by RDF process and comparison of dimension between test product and FE-simulation is good agreement.
Evaluation of moisturizing cream using terahertz time-domain spectroscopy
Choi Geunchang,Lee Do-Hee,Park Ikpyeong,Kang Daecheol,Lee Hyun Kyung,Rhie Jiyeah,Bahk Young-Mi 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Terahertz time-domain spectroscopy is a useful tool for material characterization because it provides both temporal and frequency domain information. In this work, we perform terahertz time-domain spectroscopy for evaluation of commercial moisturizing cream cosmetics. By measurement of terahertz transmission, the change of complex refractive index by exposure of the cosmetic samples in ambient condition is obtained. The tendency of terahertz transmission change is different from that of mass change, which implies that terahertz response becomes a new characterization tool for moisturizing cosmetics. Our results show that terahertz time-domain spectroscopy has potential application on cosmetic testing.
흉부 CT 검사에서 환자 팔의 위치에 따른 영상의 화질과 선량 비교
유무연 ( Muyeon Yoo ),박샘 ( Sam Park ),장희정 ( Heuijung Jang ),이효진 ( Hyojin Lee ),이종웅 ( Jongwoong Lee ),권대철 ( Daecheol Kweon ) 한국방사선학회 2014 한국방사선학회 논문지 Vol.8 No.2
흉부 CT와 같이 조직 대조도 차이가 큰 부위의 CT 검사도 환자의 팔의 위치에 따른 아티팩트 발생과 화질저하, 과다피폭 등을 방지하기 위하여 환자의 손을 머리 위로 올리고 검사를 시행하고 있다. 흉부 CT와 같이 조직 대조도 차이가 큰 부위의 검사에서 환자 팔의 위치에 따라 화질저하, 과다피폭 등이 발생한다. 2012년 서울의 K 대학병원 흉부 CT 검사는 1,642건이었다. 이중 118건이 팔을 올리지 않고 흉부 CT검사를 시행하였다. 정상적으로 팔을 올리고 검사한 그룹은 총 DLP 값의 평균이 275 mGy·cm로 나타났으며 팔을 올리지 않고 검사한 그룹의 총 DLP값 평균은 312.46 mGy·cm로 나타났다. 동일 환자의 경우 후향적 조사에서 적극적으로 팔을 올리고 검사한 경우 총 DLP 값이 267.5 mGy·cm로 조사되었고 팔을 올리지 않고 검사한 경우 총 DLP 값이 307.5 mGy·cm로 나타났다. 흉부 CT 검사에서 검사자가 적극적으로 팔을 올리지 않고 검사하면 인체의 가장 두꺼운 부위인 어깨부위를 통과한 X-ray 광자의 부족으로 인해 선형 아티팩트가 발생하였다. 흉부 CT 검사시 적극적으로 팔을 올려서 검사하는 노력으로 적은 피폭선량과 양질의 의료영상을 환자에게 제공할 수 있는 선량 최적화의 방법이 될 것이다. The aim of this retrospective research was to investigate the influence of the patient's arm position on radiation dose and scanning during CT. Chest CT image created image degradation, artifact and overdose to the patient due to the difference of the chest thickness. Therefore, the patient’s arm should up position during the CT chest examination. In 2012, 1,642 patients underwent chest CT examination in Seoul K hospital. 118 chest CT examination performed hands down position. The average DLP value of the CT chest arm up examination was 275 mGy·cm. The average DLP value of the CT chest arm down examination was 312.46 mGy·cm. In the retrospective study with same patient, The average DLP value of the CT chest examination arm up vigorously was 267.5 mGy·cm. The average DLP value of the CT chest arm down examination was 307.5 mGy·cm. Chest CT scan without raising arm created linear artifact due to the lack of X-ray photons which is the thickest part of the human body of shoulder area. In conclusion, arm positioning patients’arms above the shoulders at CT of the chest increases image quality and substantially reduces effective radiation dose.