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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.
Internet of Things (IoT) Framework for Granting Trust among Objects
Vera Suryani,Selo Sulistyo,Widyawan Widyawan 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.6
The concept of the Internet of Things (IoT) enables physical objects or things to be virtually accessible forboth consuming and providing services. Undue access from irresponsible activities becomes an interestingissue to address. Maintenance of data integrity and privacy of objects is important from the perspective ofsecurity. Privacy can be achieved through various techniques: password authentication, cryptography, and theuse of mathematical models to assess the level of security of other objects. Individual methods like these areless effective in increasing the security aspect. Comprehensive security schemes such as the use of frameworksare considered better, regardless of the framework model used, whether centralized, semi-centralized, ordistributed ones. In this paper, we propose a new semi-centralized security framework that aims to improveprivacy in IoT using the parameters of trust and reputation. A new algorithm to elect a reputationcoordinator, i.e., ConTrust Manager is proposed in this framework. This framework allows each object todetermine other objects that are considered trusted before the communication process is implemented. Evaluation of the proposed framework was done through simulation, which shows that the framework can beused as an alternative solution for improving security in the IoT.
Two-Phase Security Protection for the Internet of Things Object
Vera Suryani,Selo Sulistyo,Widyawan Widyawan 한국정보처리학회 2018 Journal of information processing systems Vol.14 No.6
Securing objects in the Internet of Things (IoT) is essential. Authentication model is one candidate to securean object, but it is only limited to handle a specific type of attack such as Sybil attack. The authenticationmodel cannot handle other types of attack such as trust-based attacks. This paper proposed two-phasesecurity protection for objects in IoT. The proposed method combined authentication and statistical models. The results showed that the proposed method could handle other attacks in addition to Sybil attacks, such asbad-mouthing attack, good-mouthing attack, and ballot stuffing attack.
PANCASILA, Irwan,HARYONO, Siswoyo,SULISTYO, Beni Agus Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.6
The purpose of this study is to determine the effect of work motivation and leadership on job satisfaction and its implications on employee performance. A total of 355 samples of Bukit Asam Coal Mining Company Ltd. in Indonesia were selected proportionally with random sampling. Data were obtained through questionnaires. Data analysis technique employed structural equation modeling (SEM) with AMOS 22. The results of the study show that leadership and work motivation have a positive and significant effect on job satisfaction. Leadership has a more considerable influence (0.263) than work motivation (0.171) toward employee job satisfaction. The influence of leadership towards job performance is 0.175. The influence of work motivation towards job performance is 0.166. Job satisfaction has the most dominant influence (0.363) towards employee performance. The direct effect of leadership on employee performance is 0.175 greater than the indirect influence of leadership on employee performance through employee job satisfaction, which is only 0.096. Likewise, the direct effect of work motivation towards employee performance is 0.166 greater than the indirect effect of work motivation towards employee performance through employee job satisfaction, which is only 0.062. Thus, job satisfaction does not mediate the effects of leadership and work motivation toward employee performance.
Bonding Performance of Maltodextrin and Citric Acid for Particleboard Made From Nipa Fronds
Mahdi Santoso,Ragil Widyorini,Tibertius Agus Prayitno,Joko Sulistyo 한국목재공학회 2017 목재공학 Vol.45 No.4
Maltodextrin and citric acid are two types of natural materials with the potential as an eco-friendly binder. Maltodextrin is a natural substance rich in hydroxyl groups and can form hydrogen bonds with lignoselulosic material, while citric acid is a polycarboxylic acid which can form an ester bond with a hydroxyl group at lignoselulosic material. The combination of maltodextrin and citric acid as a natural binder materials supposed to be increase the ester bonds formed within the particleboard. This research determined to investigate the bond-ing properties of a new adhesive composed of maltodextrin/citric acid for nipa frond particleboard. Maltodextrin and citric acid were dissolved in distillated water at the ratios of 100/0, 87.5/12.5, 75/25 and 0/100, and the concentration of the solution was adjusted to 50% for maltodextrin and 60% citric acid (wt%). This adhesive solution was sprayed onto the particles at 20% resin content based on the weight of oven dried particles. Particleboards with a size of 25 × 25 × 1 cm, a target density 800 kg/m<sup>3</sup> were prepared by hot-pressing at press temperatures of 180℃ or 200℃, a press time of 10 minute and board pressure 3.6 MPa. Physical and mechanical properties of particleboard were tested by a standard method (JIS A 5908). The results showed that added citric acid level in maltodextrin/citric acid composition and hot-pressing temperature had affected to the properties of particleboard. The optimum properties of the board were achieved at a pressing temperature of 180℃ and the addition of only 20% citric acid. The results also indicated that the peak intensity of C=O group increased and OH group decreased with the addition of citric acid and an increase in the pressing temperature, suggesting an interreaction between the hydroxyl groups from the lignocellulosic materials and carboxyl groups from citric acid to form the ester groups.
Sri Nugroho Marsoem,Fajar Setiaji,Nam Hum Kim,Joko Sulistyo,Denny Irawati,Widyanto Dwi Nugroho,Yus Andini Bekti Pertiwi 한국목재공학회 2015 목재공학 Vol.43 No.2
Fiber morphology and basic characteristics of Legi bamboos (Gigantochloa atter) growing on Yogyakarta were studied considering their age and height positions in the culms. Culms of 4, 16, and 40 months were harvested, and their total lengths were measured. The length, diameter, and wall thickness of each internode were measured. All the sample culms were divided into three different parts along the height, and their fiber dimension and physical properties were observed. The data obtained were analyzed by analysis of variance. The results showed that the culms had a diameter of 5.8 to 10.8 cm. The lowest internodes always showed the shortest length and the thickest wall. The culms had an average fiber length of 2.41 mm and Runkel ratio of 0.61. Fiber length was affected by the height, while fiber diameter, lumen diameter, and fiber wall thickness were affected significantly by the age of the culms. The culms had high green moisture content (GMC) of 157.89%, and basic density (BD) of 456.67 kg.m -3 , a total longitudinal shrinkage of 0.35%, and relatively low R/T shrinkage ratio. The interactions between age and height were affected GMC and BD.
Genetic diversity of Indonesian cattle breeds based on microsatellite markers
Paskah Partogi Agung,Ferdy Saputra,Moch. Syamsul Arifin Zein,Ari Sulistyo Wulandari,Widya Pintaka Bayu Putra,Syahruddin Said,Jakaria Jakaria 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.4
Objective: This research was conducted to study the genetic diversity in several Indonesian cattle breeds using microsatellite markers to classify the Indonesian cattle breeds. Methods: A total of 229 DNA samples from of 10 cattle breeds were used in this study. The polymerase chain reaction process was conducted using 12 labeled primers. The size of allele was generated using the multiplex DNA fragment analysis. The POPGEN and CERVUS programs were used to obtain the observed number of alleles, effective number of alleles, observed heterozygosity value, expected heterozygosity value, allele frequency, genetic differentiation, the global heterozygote deficit among breeds, and the heterozygote deficit within the breed, gene flow, Hardy-Weinberg equilibrium, and polymorphism information content values. The MEGA program was used to generate a dendrogram that illustrates the relationship among cattle population. Bayesian clustering assignments were analyzed using STRUCTURE program. The GENETIX program was used to perform the correspondence factorial analysis (CFA). The GENALEX program was used to perform the principal coordinates analysis (PCoA) and analysis of molecular variance. The principal component analysis (PCA) was performed using adegenet package of R program. Results: A total of 862 alleles were detected in this study. The INRA23 allele 205 is a specific allele candidate for the Sumba Ongole cattle, while the allele 219 is a specific allele candidate for Ongole Grade. This study revealed a very close genetic relationship between the Ongole Grade and Sumba Ongole cattle and between the Madura and Pasundan cattle. The results from the CFA, PCoA, and PCA analysis in this study provide scientific evidence regarding the genetic relationship between Banteng and Bali cattle. According to the genetic relationship, the Pesisir cattle were classified as Bos indicus cattle. Conclusion: All identified alleles in this study were able to classify the cattle population into three clusters i.e. Bos taurus cluster (Simmental Purebred, Simmental Crossbred, and Holstein Friesian cattle); Bos indicus cluster (Sumba Ongole, Ongole Grade, Madura, Pasundan, and Pesisir cattle); and Bos javanicus cluster (Banteng and Bali cattle).
( Tomy Listyanto ),( Hanan Purana Putra ),( Ganis Lukmandaru ),( Joko Sulistyo ),( Sugi Purwanto ),( Nam Hun Kim ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
The aim was to investigate the effect of girdling duration on durability and mechanical properties of 12 years old fast growing teak. Samples were obtained from 12- years old fast growing teak. Four girdling durations, which were 0 month, 3 months, 9 months and 12 months, were applied before harvesting Samples from heartwood and sapwood were tested against dry wood termites for four weeks. The observed parameters were mortality and mass losses. Modulus of Rupture (MoR) and Modulus of elasticity (MoE) were measured to examine the mechanical properties. The data were then tested using variance analysis with significantly level of 5 % and continued by Honestly Significant Difference Tukey to find the difference. The result showed that the durability class against dry wood termites of heartwood among girdling duration of 0 month, 3 months, 9 months and 12 months were class V, IV, II and II, respectively, while the sapwood one were class V, V, V and IV, respectively. The value of MoR and MoE increased slightly as the duration of girdling increased.