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( Joko Sulistyo ),( Sri Nugroho Marsoem ),( Tomy Listyanto ),( Nam Hum Kim ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
The fire-retardancy and thermal degradation of inferior tropical timber, i.e. sengon (Paraserianthes mollucana), overlaid with charcoal composite made from three wood species i.e. asam (Tamarindus indica), rambutan (Naphelium lappaceum) and melinjo (Gnetum gnemon) were studied under fire test. Borax 0%, 3% and 5% of charcoal dry weight were added into charcoal composite. The fire-retardancy of overlaid charcoal composite in fire test was affected by an interaction of charcoal wood species and the percentage of additional borax. The optimal fire-retardancy properties were shown by sengon timber overlaid with 5% borax added charcoal composite from Asam.
Accuracy Enhancement of Omnidirectional Camera Calibration for Structure from Motion
Joko Hariyono,Wahyono,Kang-Hyun Jo 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
This paper presents a technique to enhance accuracy of omnidirectional camera calibration which is applied structure from motion. We use two omnidirectional images of a predefined trihedron with checker board taken by a calibrate camera at an arbitrary location. Then, several point matches were picked manually from both views of the object. After that, compute and perform a 3D metric reconstruction of a real object from both images, by using the geometrical approach model estimated by single view calibration method. Then improved by the minimization error the distances among trihedral object use our proposed method. The overall experimental results show our proposed method gave smaller distance error.
Localization of Pedestrian Area from Hybrid Camera System
Joko Hariyono,Kang-Hyun Jo 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Accurate pedestrian path prediction and motion estimation are important tasks in the intelligent vehicle domain. The model incorporates the pedestrian pose recognition and lateral speed, motion direction and spatial layout of the environment. Pedestrian poses are recognized according to the spatial body language ratio. The region of interest of detected human is used. Then the centroid of the body relative to its width and height is used to define the pedestrian pose. Motion trajectory is obtained by using point tracking on that centroid, and then motion direction and estimated velocity are determined. Spatial layout is determined by the location of pedestrian with respect to road boundary. Input vector pedestrian pose, motion direction and speed, and the distance from the road lane are used by linear dynamic system. Instead of combining a number of subjects in a single model that will have to deal with the stylistic variations, all the subjects are separately trained in individual models. These models will be then hierarchically separated according to their action. Then, its classification will constrain the models to use for the prediction. Hybrid camera system is performed. A perspective camera is used for pedestrian localization with respect to car speed. And then an omnidirectional camera is used to enlarge field of view of monocular camera. Pedestrians are tracked in 360 degree around the vehicle. Experimental results show that the system has path predictions accuracy with the largest mean errors, 25 cm, for bending trajectories.
Alternative housing priorities for low-income migrants in Jakarta, Indonesia
Joko Adianto,Rossa Turpuk Gabe 서울시립대학교 도시과학연구원 2023 도시과학국제저널 Vol.27 No.1
This empirical study suggests an alternative housing priority for the housing pathways of low-income migrants. An economic perspective has been the dominant paradigm in determining urban housing trajectories and has been cemented as the pedestal of the housing provision programme. However, this study is conducted in the highest density sub-districts of each of Jakarta’s five municipalities with mixed research method, evinces that forced eviction is one of the pivotal determinants of the housing pathway of low-income households and spatial dispersal is embedded in webs of kinship. Having lost their livelihood assets through hazard or eviction, low-income migrants move to the city to recuperate their loses by living with or near other family members. Through collective efficacy, their place attachment solidifies and confines their housing pathway to a short distance from other family and kin members.
Effect of Temperature of Freeze Dryer on Drying Rate of Jackfruit (Artocarpus heterophyllus Lamk)
( Joko Nw ),( Karyadi ),( Putri D. G. P. ),( Rahma S. ),( Sitindaon R. ),( Ayuni D. ),( Bintoro N. ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
Jackfruit is the unique tropical fruit because of its sweet taste and aroma, as well as because it contained so much nutrients. One of the processes that can be done to have jackfruit with longer shelf-life is by processed it into dried fruit. This research aims to process the jackfruit into fruit chips using freeze drying technique. This research determined the drying rate kinetic, as well as to find the effect of freeze drying process to the quality of jackfruit. The freeze dryer is made with a stainless steel plate that has a diameter of 0.40 cm and a length of 0.50 m. Four electric heaters were installed in 4 racks, with a total power of 500 watts. In order to collect the evaporated water, the cool trap device is fitted with a 5 m refrigerant pipe that is rolled with a diameter of 10 cm. The vacuum pump was installed at the end of the cold trap. Drying was conducted with variations of heating temperature of 50°C, 60°C and 70°C at a pressure of -74 cmHg vacuum. The results shows that the coefficient of drying rate of dried Jackfruit at drying temperature 50°C, 60°C and 70°C were 0,1034%, 0,1178% and 0,1382%, respectively. From the results of this study indicate that at 70°C drying temperature, dried jackfruit still shows acceptable color, taste and good texture.The body of the abstract should be limited up to 500 words. Include importance of the work, overall objectives, brief description of materials and methods, major results, and implication of your work.
Physicochemical and Functional Characterization of Blue-Shelled Eggs in Korea
Joko Sujiwo,Dongwook Kim,Ji-yeol Yoon,Hanna Kim,Jung-soo Kim,Sung-ki Lee,Aera Jang 한국축산식품학회 2017 한국축산식품학회지 Vol.37 No.2
The aim of this study was to compare the quality and physicochemical characteristics of blueshelled eggs (BE) and conventional eggs (CE). Proximate composition, quality, pH value, shell color, collagen content, fatty acid composition, total cholesterol, α-glucosidase inhibition activity, and antioxidation activity were determined. The proximate composition, general qualities, and pH values of CE and BE showed no significant differences, except in moisture composition, weight, and shell thickness. Moisture content and weight of BE were significantly lower than those of CE. However, shell thickness and weight of BE were higher than those of CE (p
Analysis of Pedestrian Collision Risk using Fuzzy Inference Model
Joko Hariyono,Laksono Kurnianggoro,Wahyono,Kang-Hyun Jo 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
The aim of this work is to improve driver awareness by proposing a collision risk analysis method. Pedestrian in the scene is observed by sequential frames from monocular camera mounted on the car. Positional information of object is extracted by projecting the centroid of bounding box on the ground plane. Four elements of collision criteria are constructed which are pedestrian walking direction, its velocity, car speed and relative distance of pedestrian. The analysis of collision risk is performed using fuzzy inference method that is used for calculating the degree of risk. Furthermore, localization of pedestrian is performed according to its risk score. The pedestrian with low collision score is labeled as low risk (green), pedestrian which is increasing its collision score is considered as medium risk (yellow) and pedestrian with high collision score is labelled as high risk (red). A quantitative analysis is performed by measuring effectiveness of this approach. The performance evaluation shows our proposed method achieved average accuracy 87.5% and it significantly outperforms human perception with more than 25% improvement.