• Title/Summary/Keyword: IPB

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Antiplatelet Aggregation Potencies of some Allium spp. Grown in Indonesia

  • Wijaya, C. Hanny;Muchtadi, Deddy;Lalel, Herianus J.;Zakaria, Fransiska;Koswara, Sutrisno
    • Natural Product Sciences
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    • v.2 no.1
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    • pp.37-42
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    • 1996
  • Several species and varieties of Allium spp. grown in Indonesia were screened for their in vitro antiplatelet aggregation activities. The extracts were also analyzed by GC for their volatile sulfur-containing compounds, and measured for their Volatile Reducing Substances (VRS) contents. Antiplatelet aggregation potencies of Allium spp. were varied among the species and varieties studied. Garlic extracts showed the greatest ability to inhibit platelet aggregation followed by extract of shallot, chive, yellow onion, and green onion. The 'Jawi' and 'local Padang' variety of garlic showed high activities with $IC_{50}$ values of 9.1 and $9.8\;{\mu}g/ml$, respectively. The local Kupang variety of shallot showed the highest antiplatelet activity among the shallot varieties evaluated, with an $IC_{50}$ value of $111\;{\mu}g/ml$. Antiplatelet aggregation activities of Allium extracts showed a positive correlation with the level of volatile compounds.

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Nonlinear Finite Element Analysis for Mooring Chain Considering OPB/IPB (OPB/IPB를 고려한 계류체인의 비선형 수치해석)

  • Kim, Min-suk;Kim, Yooil
    • Journal of Ocean Engineering and Technology
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    • v.31 no.4
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    • pp.299-307
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    • 2017
  • The design of the mooring line to maintain the position of an offshore structure in rough marine environments is recognized as a very important consideration. Conventional fatigue evaluation of a mooring line was performed by considering the tensile force acting on the mooring line, but the mooring line broke after 238 days in the girassol area even though the expected fatigue life was expected to be longer. The causes of this event are known to be due to OPB/IPB (out-of-plane bending/in-plane bending) caused by chain link friction due to the excessive tensile strength of the mooring line. In this study, three models with different boundary conditions were proposed for fatigue analysis of a mooring line considering OPB/IPB. Interlink stiffness was calculated by nonlinear structure analysis and a stress concentration factor was derived. In addition, the sensitivity of interlink stiffness according to the magnitude of tensile force, large deformation effect, and coefficient of friction was analyzed, and the effect of critical elastic slip and bending moment calculation position on interlink stiffness was confirmed.

Influences of Product Attributes and Lifestyles on Consumer Behavior: A Case Study of Coffee Consumption in Indonesia

  • UTAMA, Adi Prasetya;SUMARWAN, Ujang;SUROSO, Arif Imam;NAJIB, Mukhamad
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.5
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    • pp.939-950
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    • 2021
  • The purpose of this study was to measure the significance and contribution of sensory appeal, lifestyle, and health motive in determining coffee drink consumption. The theory adopted is the SOR (stimulus-organism-response) theory and the AISAS (attention-interest-search-action-share) model approach. Data was collected online in April-May 2020, and obtained 413 valid respondent data. The data were processed using SEM (Structural Equation Modeling) framework. The results showed that the variable sensory appeal of coffee drinks, lifestyle variables and health motive variables had a significant effect on coffee consumption. Of the 13 hypotheses proposed, nine hypotheses are accepted and four hypotheses are rejected. Sensory appeal has a positive effect on attitude and action of coffee consumption. Lifestyle has a positive effect on attitude, search, and action, whereas health motive has a positive effect on attitude of coffee consumption. Lifestyle variables have the greatest role in determining coffee consumption, followed by health motive variables and sensory appeal of coffee drinks. The SOR theory and the AISAS approach can both be used to analyze coffee drinking behavior. The research suggests that, to increase coffee consumption, a marketing approach should touch the lifestyle of the community and increase the promotion of the health aspects of coffee drinks.

Anatomical Structures and Fiber Quality of Four Lesser-Used Wood Species Grown in Indonesia

  • MARBUN, Sari Delviana;WAHYUDI, Imam;SURYANA, Jajang;NAWAWI, Deded Sarip
    • Journal of the Korean Wood Science and Technology
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    • v.47 no.5
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    • pp.617-632
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    • 2019
  • This study aimed to investigate the anatomical structure and fiber quality of four lesser-used wood species namely Benuang (O. sumatrana), Duabanga (D. moluccana), Pisang Merah (H. hellwigii), and Terap (A. odoratissimus). This study evaluated its suitability for raw material in pulp and paper manufacturing. The anatomical structure was observed macro- and microscopically. Macroscopic structures were observed directly to the wood samples, while microscopic characteristics were observed through microtome specimens. Fiber dimension was measured through macerated specimens and fiber quality was analyzed following the Rachman and Siagian's method. Results showed that these four timber species have similarity in the indistinct growth ring, diffuse porous in a radial pattern, rounded solitary vessel outline, 1 to 3 cells of ray width, deposits within the rays, fiber length, and cell wall thickness. Differences were found on vessel diameter, vessel grouping, vessel frequency, tyloses existence, type of axial parenchyma, and ray height. Based on fiber length and its derived values, the wood fibers of all species studied are suitable for pulp and paper manufacturing. They belong to the II quality class. The produced pulp and paper would have good quality, especially in tensile, folding, and tear strength. To promote their utilization, silviculture aspect of these four species has to be well understood.

Fatigue analysis on the mooring chain of a spread moored FPSO considering the OPB and IPB

  • Kim, Yooil;Kim, Min-Suk;Park, Myong-Jin
    • International Journal of Naval Architecture and Ocean Engineering
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    • v.11 no.1
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    • pp.178-201
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    • 2019
  • The appropriate design of a mooring system to maintain the position of an offshore structure in deep sea under various environmental loads is important. Fatigue design of the mooring line considering OPB/IPB(out-of-plane bending/in-plane bending) became an essential factor after the incident of premature fatigue failure of the mooring chain due to OPB/IPB in the Girassol region in West Africa. In this study, mooring line fatigue analysis was performed considering the OPB/IPB of a spread moored FPSO in deep sea. The tension of the mooring line was derived by hydrodynamic analysis using the de-coupled analysis method. The floater motion time histories were calculated under the assumption that the mooring line behaves in quasi-static manner. Additional time domain analysis was carried out by prescribing the obtained motions on top of the selected critical mooring line, which was determined based on spectral fatigue analysis. In addition, nonlinear finite element analysis was performed considering the material nonlinearities, and both the interlink stiffness and stress concentration factors were derived. The fatigue damage to the chain surface was estimated by combining both the hydrodynamic and stress analysis results.

The Role of Organizational Justice and Job Rotation in Job Satisfaction and Work Attitudes: An Exploratory Study in Indonesia

  • WARMAN, Muhammad Aditya;MAARIF, M. Syamsul;SUKAMAWATI, Anggraini;AFFANDI, Joko;MANGUNDJAYA, Wustari L.
    • The Journal of Asian Finance, Economics and Business
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    • v.9 no.5
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    • pp.531-539
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    • 2022
  • The goal of the research is to identify the relationship between organizational justice, job satisfaction, and work attitudes in the context of job rotation. The competence and loyalty of the employees of an organization are critical to the organization's success. Therefore, organization should invest in developing their employees, including creating effective procedures and human resource management policies. A job rotation program is one of the critical policies in developing employees, as through this program employees can develop and actualize their abilities. However, there are some challenges in practice regarding implementing the procedures of job rotation. One of the challenges is related to the concept of organizational justice, which then impacts on employees' job satisfaction and work attitudes. This study was conducted in focused group discussions. The sample is 272 of a state-owned organization. In this study, the concept of organizational justice, with the dimensions of distributive justice, procedural justice, and interactional justice, were used along with the discussion of job satisfaction and other work attitudes. The results were issues of fairness in perceiving organizational justice in the job rotation context, and the most significant response lies in procedural justice.

An Integer Programming-based Local Search for the Set Covering Problem (집합 커버링 문제를 위한 정수계획법 기반 지역 탐색)

  • Hwang, Jun-Ha
    • Journal of the Korea Society of Computer and Information
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    • v.19 no.10
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    • pp.13-21
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    • 2014
  • The set covering problem (SCP) is one of representative combinatorial optimization problems, which is defined as the problem of covering the m-rows by a subset of the n-columns at minimal cost. This paper proposes a method utilizing Integer Programming-based Local Search (IPbLS) to solve the set covering problem. IPbLS is a kind of local search technique in which the current solution is improved by searching neighborhood solutions. Integer programming is used to generate neighborhood solution in IPbLS. The effectiveness of the proposed algorithm has been tested on OR-Library test instances. The experimental results showed that IPbLS could search for the best known solutions in all the test instances. Especially, I confirmed that IPbLS could search for better solutions than the best known solutions in four test instances.

Improvement of Fast-Growing Wood Species Characteristics by MEG and Nano SiO2 Impregnation

  • DIRNA, Fitria Cita;RAHAYU, Istie;ZAINI, Lukmanul Hakim;DARMAWAN, Wayan;PRIHATINI, Esti
    • Journal of the Korean Wood Science and Technology
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    • v.48 no.1
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    • pp.41-49
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    • 2020
  • Jabon (Anthocephalus cadamba) is a fast-growing wood species that is widely utilized for light construction and other purposes in Indonesia. The objectives of the current study were to determine the effects of monoethylene glycol (MEG) and SiO2 nanoparticles (nano SiO2) impregnation treatment on the dimensional stability and density of jabon wood and to identify the characteristics of impregnated jabon wood. Wood samples were immersed in water (as untreated), MEG, 0.5% MEGSiO2, then impregnated by applying 0.5 bar of vacuum for 60 min, and then applying 2.5 bar of pressure for 120 min. The results showed that impregnation with MEG and Nano SiO2 had a significant effect on the dimensional stability of jabon wood. Polymers can fill cell walls in wood indicated by increasing weight percentgain, antiswelling efficiency, bulking effect, and density, then decreasing in water uptake value. Jabon wood morphology by using SEM showed that MEGSiO2 polymers can cover part of the pitsin the wood vessel wall of jabon. This finding was reinforced by EDX results showing that the silicon content was increased due to the addition of SiO2 nano. The XRD diffraction pattern indicated that MEGSiO2 treatment increased the degree of crystallinity in wood samples. Overall, treatment with 0.5% MEGSiO2 led to the most improvement in the dimensional stability of 5-year-old jabon wood in this study.

The Quantification of Considerations related with Decision-making in Ground Operation : Focusing on Evaluating Avenues of Approach in IPB (지상작전과 연관된 의사결정 고려요소의 정량화 방안 : 전장정보분석의 접근로 평가요소를 중심으로)

  • Han, Seung Jo;Lee, Seungmin
    • Convergence Security Journal
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    • v.19 no.2
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    • pp.129-136
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    • 2019
  • The main tasks of commander and staffs in ground operations are a continuation performing the process of making decisions in various situations. Since the current decision-making process is largely dependent on qualitative methods, it is difficult to integrate with the decision-making tools associated with the 4th Industrial Revolution. The purpose of this study is to suggest the process of deriving the relative importance of the evaluation factors using the AHP with focusing on assessing the avenues of approach in IPB related to the ground operation plan. The most important aspect of IPB is the evaluation of the avenues of approach. Evaluation factors include target accessibility, observation and seasons, concealment and cover-up, ease of maneuverability, and ease of transition to adjacent access roads. The existing methods are the comparison method with evaluation factors and the analysis with the advantages and disadvantages. However, it has been criticized that they regard evaluation factors as equal importance. The results show that target accessibility has the highest score related with priority when considering the criteria.

Characterization of Denitrifying and Dissimilatory Nitrate Reduction to Ammonium Bacteria Isolated from Mud Crab Culture Environment

  • Hastuti, Yuni Puji;Rusmana, Iman;Nirmala, Kukuh;Affandi, Ridwan;Fatma, Yuli Siti
    • Microbiology and Biotechnology Letters
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    • v.49 no.3
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    • pp.432-439
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    • 2021
  • Microbial community plays important roles in the culture environment of mud crab Scylla serrata. One of the environmental management efforts for the cultivation of S.serrata is by stabilizing microorganisms involved in nitrogen cycle process. The availability of dissolved inorganic nitrogen in its culture environment under a recirculating system closely relates to the nitrogen cycle, which involves both anaerobic and aerobic bacterial activities. Anaerobically, there are two major nitrogen compound degradation processes, i.e., denitrification and dissimilatory nitrate reduction to ammonium (DNRA). This study aimed to identify denitrifying and DNRA bacteria isolated from the recirculating cultivation of S. serrata. The water samples were collected from anaerobic filters called close filter system, which is anaerobically conditioned with the addition of varying physical filter materials in the recirculating mud crab cultures. The results showed that three denitrifying bacterial isolates and seven DNRA bacterial isolates were successfully identified. The phylogenetic analysis based on 16S rRNA gene of the denitrifying bacteria revealed that HIB_7a had the closest similarity to Stenotrophomonas daejeonensis strain MJ03. Meanwhile, DNRA bacterial isolate of HIB_92 showed a 100% similarity to Bacillus sonorensis strain N3, Bacillus vallismortis strain VITS-17, Bacillus tequlensis strain TY5, Geobacillus sp. strain DB24, Bacillus subtilis strain A1, and Bacillus mojavensis strain SSRAI21. This study provides basic information denitrifying and DNRA bacterial isolates identity which might have the potential to be applied as probiotics in aquaculture systems in order to maintain optimal environmental conditions.