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Estimation of Antenna Correlation Coefficient of N-Port Lossy MIMO Array
Susilo Ady Saputro,Satya Nandiwardhana,Jae‐Young Chung 한국전자통신연구원 2018 ETRI Journal Vol.40 No.3
This paper proposes a simple yet accurate method for estimating the antenna correlation coefficient (ACC) of a high‐order multiple‐input multiple‐output (MIMO) antenna. The conventional method employed to obtain the ACC from three‐dimensional radiation patterns is costly and difficult to measure. An alternate method is to use the S‐parameters, which can be easily measured using a network analyzer. However, this method assumes that the antennas are highly efficient, and it is therefore not suitable for lossy MIMO antenna arrays. To overcome this limitation, we define and utilize the non‐coupled radiation efficiency in the S‐parameter‐based ACC formula. The accuracy of the proposed method is verified by the simulation results of a 4‐port highly coupled lossy MIMO array. Further, the proposed method can be applied to N‐port arrays by expanding the calculation matrix.
Susilo Ady Saputro,Jae-Young Chung,Chan KOH 한국정보기술학회 2015 Proceedings of KIIT Conference Vol.2015 No.6
The objective of the paper is to present a study on ICTs based factors that improve competitiveness of Indonesian tourism industry. Through a study on tourism literatures, the paper will enlist ICTs based factors affecting on improvement of the competitiveness in tourism industry. However, to improve all of the factors simultaneously will take a huge amount of cost and resources. By statistical DEMATEL analysis, the paper will determine the relationship between these factors to classified and decide the priority factors in order to help business players in making policies to improve their competitiveness gradually.
Business Empowerment Program and Household Economic Welfare: Lesson from Indonesia
PURWANTI, Pudji,SUSILO, Edi,INDRAYANI, Erlinda Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.1
This study aims to analyze the household economic behavior of salt farmers participants in Salt Business Empowerment Program (Pugar) including of salt production, work flow, household revenue, the behavior of consumption of food and non-food items and the welfare level. This research followed a survey method by engaging 32 household farmers as participants. The findings revealed that the empowerment program was carried out through the technical assistance of salting production and the assistance of equipment and technology from Thread of Screw Filter and geoisolators to improve the quality of salt. The problems come when the marketing of salt is still limited to the collectors of salt which led to the price of salt level, manufacturers have not remained stable. Household revenue sources for some salt farmers also come from non-salt pond business activities. Farmer household revenue can be used to meet staple food consumption and non-food staple consumption. Based on the indicators of family welfare, households participating in the empowerment program were group into the category of prosperous families. In order to stabilize the price of salt at the producer level, government intervention in the people's salt trading system is needed.
Addy Wahyudie,Tri Bagus Susilo,Cuk Supriyadi Ali Nandar,Sameer Fayez,Rachid Errouissi 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.12
This paper proposes two control techniques to provide robust tracking for magnetic levitation systems (MLS): model-free control (MFC) and robust proportional-integral-derivative (PID) control. The proposed MFC does not require a mathematical model. The MFC uses a stabilising local PID controller and a continuous saturation function of a sliding surface. The local stabilising control is achieved through a trial-and-error method, while the other parameters in the sliding surface are tuned to achieve the required tracking and robustness objectives. For robust PID controller, a linear model of MLS is derived. The robustness, tracking, and transient problems are formulated using the H∞ theory and solved using the genetic algorithm. Experimental verifications are conducted to demonstrate the effectiveness of the proposed controllers.
Gitta Agnes Putri,Sunarsih,Susilo Hariyanto 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.4
This paper presents the numerical simulation of advection-diffusion mechanism of BOD concentration which was used as an indicator of waste only in one flow-direction of waste stabilization ponds (1-dimension (1-D)). This model was represented in partial differential equation order 2. The purpose of this paper was to determine the simulation of the model 1-D of wastewater transport phenomena based advection-diffusion mechanism and did validate the model. Numerical methods which was used for the solution of this model is finite difference method with Forward Time Central Space scheme. The simulation results which was obtained would be compared with field observation data as a validation model. Collection of field data was carried out in the Wastewater Treatment Plant Sewon, Bantul, D.I. Yogyakarta. The results of numerical simulations were indicate that the advection-diffusion mechanism takes place continuously over time. Then validation of the model was state that there was a difference between the calculation results with the field data, with a correlation value of 0.998.
Wiharto,Esti Suryani,Murdoko Susilo 한국지능시스템학회 2019 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.19 No.4
Blood vessels in the retina of the eye are one important sign when making a diagnosis of hypertensive retinopathy. On the retina can be known several signs including tortuosity and arteriovenous ratio. Blood vessels mixed with a number of objects in the retina, the segmentation of blood vessels becomes a very interesting challenge because they have to separate blood vessels from a number of objects. This study aims to segmentation blood vessels using the main method of self-organizing maps artificial neural networks (SOMANN). The proposed segmentation method is divided into three stages, namely preprocessing, segmentation, and performance analysis. The preprocessing step is to improve image quality using the contrast-limited adaptive histogram equalization (CLAHE), median filter, and morphology. The segmentation stage uses the SOM-ANN algorithm combined with the mean or median thresholding. The performance parameters which are measured consist of sensitivity, specificity, and area under the curve (AUC). The test results using the dataset STARE and DRIVE show that the median thresholding is able to provide the best AUC performance compared to the mean thresholding. The proposed segmentation model is able to provide performance in the excellent category, with AUC values of 90.55% for the STARE dataset and 90.35% for the DRIVE.
Delima Engga Maretha,Dini Afriansyah,Dewi Susilo Wati,Mashuri Masri,Ade Rizky Dwiyanti,Muhammad Ifham Hanif,Slamet Wardoyo 경희대학교 융합한의과학연구소 2022 Oriental Pharmacy and Experimental Medicine Vol.22 No.4
Premature aging can occur due to excessive sun exposure which causes hyperpigmentation problems and causes brown or black patches on the skin. Duku (Lansium domesticum Corr.) contains flavonoids and vitamin C compounds that are effective in protecting the skin from sun exposure. This study aims to see the benefits of the extract of the seeds and peel of duku fruit (Lansium domesticum Corr.) On the amount of melanin pigment in the skin of mice (Mus musculus) as an antihyperpigmentation so that the dapjekal is a skin pen. Group P0 was a negative control, group P1 was exposed to sunlight for 20 days, group P2 mice were exposed to duku seed extract and then exposed to sunlight for 20 days, group P3 were exposed to duku peel and exposed to local sunlight for 20 days, P4 mice were exposed to sunlight 20 days, 21–30 days exposed to peel extract, and P5 mice exposed to sunlight 20 days, 21–30 days exposed to seed extract. The results showed that the P0 group had the amount of melanin pigment with an average of 7 grains, the P1 group: 68.4, P2 group: 26.6, P3 group: 29, P4 group: 7.2, and group P5 group: 12. The conclusion is that exposure to sunlight the amount of melanin pigment and offers the extract of the peel and seeds of duku fruit can reduce the amount of melanin pigment.
Selection of dipterocarp species for enrichment planting in a secondary tropical rainforest
Widiyatno,Fanny Hidayati,Suryo Hardiwinoto,Sapto INDRIOKO,Susilo Purnomo,Jatmoko,Naoki Tani,Mohammad Naiem 한국산림과학회 2020 Forest Science And Technology Vol.16 No.4
The selection of species for enrichment planting that involves native species in a secondary lowland dipterocarps forest as one of the tropical rainforest types should be conducted to maintain the sustainable management of tropical rainforests. The research of species trial of dipterocarp species was planted under a randomized complete block design with four repli�cations. The following parameters were examined: survival rate, diameter breast height (DBH), pilodyn penetration (PP), and stress wave velocity (SWV). The survival rate (F ¼ 1.72; p ¼ 0.047), DBH (F ¼ 6.67, p < 0.0001), and pilodyn penetration (F ¼ 14.19; p < 0.001) signifi�cantly differed at 12.5 years after planting. The survival rate of Shorea leprosula was the high�est (85%) of all the species, and the survival rate of other species, namely, S. macrophylla, S. ovalis, S. johorensis, S. scaberima, and S. parvifolia, was more than 70%. The best growth of DBH parameter was observed in S. platyclados. The DBH growth of S. platyclados 12.5 years after planting were 27.62 cm (mean annual diameter increment [MADI]¼ 2.2 cm/year). The species whose growth in DBH was similar to those of S. platyclados were S. leprosula, S. parvivolia, and S. ovalis. However, stress wave velocity (SWV) was not significantly different among dipterocarp species (F ¼ 1.26; p ¼ 0.234). Pilodyn penetration (PP) was significantly correlated with DBH (Pearson’s correlations ¼ 0.306; p < 0.001), whereas stress wave velocity was not significantly correlated with DBH and PP (p > 0.05), and their Pearson’s correlations were 0.043 and 0.012, respectively. These results suggested that each dipterocarp species varied in terms of their growth and wood properties. Thus, choosing the species for enrich�ment planting in secondary tropical rainforests depends on the characteristics of each spe�cies and the desired final product of forest management.