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      • SCOPUS

        Steady-State Analysis and Trade Balance Convergence Rate of ASEAN Member Countries

        Agus Maolana HIDAYAT1,Rina INDIASTUTI2,Budiono BUDIONO3,Ferry HADIYANTO4 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        The international trade role of a country depends on its economic condition, international economic openness, and cooperative orientation in its trade. This research analyzes AFTA free trade relating to the steady-state, disparity, and the ASEAN members’ trade balance convergence rate. The data used was taken from UNCTAD, ASYB, and Central Bank of Indonesia. The analysis model used was the most appropriate from Common, Fixed Effect Model (FEM), Random Effect Model (REM), and Generalized Method of Moment (GMM). ASEAN members’ balance trade reached a different steady-state for every country, therefore convergence pattern did not take place, and the divergence pattern occurred in trade balance among the member countries. The divergent trade balance was due to the different early economic conditions, macroeconomic development, trade openness, and trade facilities and infrastructures in each country. It was also due to the ASEAN intratrade cooperative role and low investment coming from intra-ASEAN foreign investment. To promote trade and lower divergent trade balance, it is necessary to promote intra-ASEAN trade and create a conducive situation for foreign capital investors.

      • KCI등재

        Reduction of Hydrogen Sulphide in Chicken Manure by Immobilized Sulphur Oxidising Bacteria Isolated from Hot Spring

        M. Y. Hidayat1,H. M. Saud,A. A. Samsudin 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.1

        The rapid development of the poultry industry has led to the production of large amounts of manure, which produce substances like hydrogen sulfide (H2S) that contribute to odor pollution. H2S is a highly undesirable gas component and its removal from the environment is therefore necessary. Sulfur-oxidizing bacteria (SOB) are widely known to remove contaminating H2S due to their ability to oxidize reduced sulfur compounds. In this study, three potential SOB (designated AH18, AH25, and AH28) that were previously isolated from a hot spring in Malaysia were identified by 16S rRNA gene analysis. Laboratory-scale biological deodorization experiments were conducted to test the performance of the three isolates—in the form of pure or mixed cultures, with the cells immobilized onto alginate as a carrier—in reducing the H2S from chicken manure. On the basis of 16S rRNA phylogenetic analysis, isolate AH18 was identified as Pseudomonas sp., whereas isolates AH25 and AH28 were identified as Achromobacter sp. The most active deodorizing isolate was AH18, with an H2S reduction rate of 74.7% (p < 0.05). Meanwhile, the reduction rates for isolates AH25 and AH28 were 54.2% and 60.8% (p > 0.05), respectively. However, the H2S removal performance was enhanced in the mixed culture, with a reduction rate of 81.9% (p < 0.05). In conclusion, the three potential SOB isolates were capable of reducing the H2S from chicken manure in the form of a pure culture immobilized on alginate, and the reduction performance was enhanced in the mixed culture.

      • KCI등재

        Transmission of Tomato leaf curl begomovirus by Two Different Species of Whitefly (Hemiptera: Aleyrodidae)

        Sri Hendrastuti Hidayat,Emma Rahmayani 한국식물병리학회 2007 Plant Pathology Journal Vol.23 No.2

        '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 9시까지 원문보기가 가능합니다.

        in English). Bulletin HPT 1:26-31.Sudiono, Hidayat, S. H., Suseno, R. and Sosromarsono, S. 2001.Molecular detection and host range study of tomato-infectingbegomovirus. Proc. Indo. Phytopthol. Soc. Seminar pp. 208-217.Sukamto, Kon, T., Hidayat, S. H., Ito, K., Hase, S., Takahashi, H.and Ikegami, M. 2005. Begomoviruses associated with leafcurl disease of tomato in Java, Indonesia. J. Phytopathol. 153:562-566.Sulandari, S., Suseno, R., Hidayat, S. H., Sosromarsono, S. andHarjosudarmo, J. 2005. Detection and host range study ofgeminivirus causing pepper yellow leaf curl disease (Abstractin English). Hayati 13:1-6.van Regenmortel, M. H. V., Fauquet, C. M., Bishop, D. H. L.,

      • SCIESCOPUS

        A comparison of mono- and multi-valent ions as stack feed solutions in microbial reverse-electrodialysis electrolysis cells and their effects on hydrogen generation

        Hidayat, S.,Song, Y.H.,Park, J.Y. Elsevier Applied Science 2016 INTERNATIONAL BIODETERIORATION AND BIODEGRADATION Vol.113 No.-

        Microbial reverse-electrodialysis cells (MRECs) are an emerging technology combining microbial electrolysis cells (MEC) with reverse electrodialysis (RED) for the production of hydrogen gas. In this study, the MREC system used monovalent ions (Na<SUP>+</SUP> and Cl<SUP>-</SUP>) and a mixture of mono- and multi-valent ions (Mg<SUP>2+</SUP> and SO<SUB>4</SUB><SUP>2-</SUP>) as stack feed solutions, which were compared to determine the effect of the presence of multivalent ions on MREC performance. The MREC system operated under batch conditions using acetate as a substrate while the RED stack operated under continuous flow conditions using pure NaCl and a mixture with a 10% molar fraction of multivalent ions and a 90% molar fraction of monovalent ions as stack feed solutions (flow rate = 1.2 mL min<SUP>-1</SUP>). When using 10% of MgSO<SUB>4</SUB> as a stack feed solution, the maximum current achieved for the MREC system decreased from 4.2 to 3.7 mA compared to the pure NaCl. Moreover, the quantity of hydrogen produced, the production rate, and yield also decreased by approximately 32, 35, and 23%, respectively. The results obtained from this study demonstrated that the presence of multivalent ions had an adverse effect on MREC performance.

      • SCIESCOPUSKCI등재

        Effect of zinc on the immune response and production performance of broilers: a meta-analysis

        Hidayat, Cecep,Sumiati, Sumiati,Jayanegara, Anuraga,Wina, Elizabeth Asian Australasian Association of Animal Productio 2020 Animal Bioscience Vol.33 No.3

        Objective: This study performed a meta-analysis of published trials to determine the effects of zinc on the immune response and production performance of broilers. Methods: A database was built from published literature regarding the addition of zinc forms or doses and their relation to the immune response and production performance of broilers. Different doses or forms of zinc were identified in the database. The recorded parameters were related to the immune response and production performance. The database contained a total of 323 data points from 41 studies that met the criteria. Then, the data were processed for a meta-analysis using a mixed model methodology. The doses or different forms of zinc were considered fixed effects, different studies were treated as random effects, and p-values were used as the model statistics. Results: An increase in zinc dose increased (p<0.05) pancreas metallothionein (MT) and zinc concentrations in the plasma, tibia and meat, all in quadratic patterns, but linearly decreased (p<0.05) the heterophil/lymphocyte (H/L) ratio. Regarding the different zinc forms, both inorganic and organic zinc increased (p<0.05) the zinc concentrations in the plasma and tibia, the calcium and phosphorus contents in the tibia, and the antioxidant activity of superoxide dismutase in meat as compared to control. An increase in zinc dose increased average daily gain (ADG) and decreased feed conversion ratio (FCR) following a quadratic pattern (p<0.05). Inorganic and organic zinc decreased (p<0.05) FCR and H/L ratio than that of control, but these two forms were similar for these parameters. Conclusion: Zinc addition has a positive impact on immunity and broiler production. Zinc can suppress stress and inhibit the occurrence of lipid peroxidation in broilers, and it can also improve ADG, FCR, and the quality of broiler carcasses.

      • KCI등재

        A New Form of Fuzzy Generalized Bi-Ideals in Ordered Semigroups

        ( Hidayat Ullah Khan ),( Nor Haniza Sarmin ),( Asghar Khan ) 호남수학회 2014 호남수학학술지 Vol.36 No.3

        In several applied disciplines like control engineering, computer sciences, error-correcting codes and fuzzy automata theory, the use of fuzzified algebraic structures especially ordered semigroups and their fuzzy subsystems play a remarkable role. In this paper, we introduce the notion of (-e,-ev-qk,)-fuzzy subsystems of ordered semigroups namely (-e,-ev-qk,)-fuzzy generalized bi-ideals of ordered semigroups. The important milestone of the present paper is to link ordinary generalized bi-ideals and (-e,-ev-qk,)-fuzzy generalized bi-ideals. Moreover, different classes of ordered semigroups such as regular and left weakly regular ordered semigroups are characterized by the properties of this new notion. Finally, the upper part of a (-e,-ev-qk,)-fuzzy generalized bi-ideal is defined and some characterizations are discussed.

      • KCI등재

        Marketing Practices and Value-Added Fish Product in East Indonesia

        HIDAYAT, Sopian,PABUAYON, Isabelita M.,MUAWANAH, Umi Korea Distribution Science Association 2020 The Journal of Business, Economics, and Environme Vol.10 No.2

        Purpose: This study assesses the marketing practices and value-added fish products under the Coral Reef Rehabilitation and Management Program (COREMAP) in East Indonesia. Research design, data and methodology: This study gathered qualitative and quantitative data through i) focus group discussions (FGD) with fishers, traders and COREMAP officers, ii) surveys and iii) interviews with fishermen and traders. This study surveyed 714 households (365 in COREMAP and 349 in non-COREMAP) and 33 traders (17 in COREMAP and 16 in non-COREMAP) using structured questionnaires between January and March 2016. This study used Shepherd's Index to estimate the marketing efficiency for each stage of the marketing channel. For value-added fish products, the value is determined by the difference between processed output and the raw product used. Results: Marketing cost in the non-COREMAP area was more efficient than in COREMAP as indicated by lower operational cost and higher selling price. However, no value-added fish products were produced in the non-COREMAP area. This study noted a lower catch in COREMAP area, which implies COREMAP program successfully reduced fishing pressure. Conclusions: This study identified poor infrastructure and the limited market as the major problems in developing value-added fish products in both COREMAP and non-COREMAP area.

      • SCOPUSKCI등재

        Reduction of Hydrogen Sulphide in Chicken Manure by Immobilized Sulphur Oxidising Bacteria Isolated from Hot Spring

        Hidayat, M.Y.,Saud, H.M.,Samsudin, A.A. The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.1

        The rapid development of the poultry industry has led to the production of large amounts of manure, which produce substances like hydrogen sulfide ($H_2S$) that contribute to odor pollution. $H_2S$ is a highly undesirable gas component and its removal from the environment is therefore necessary. Sulfur-oxidizing bacteria (SOB) are widely known to remove contaminating $H_2S$ due to their ability to oxidize reduced sulfur compounds. In this study, three potential SOB (designated AH18, AH25, and AH28) that were previously isolated from a hot spring in Malaysia were identified by 16S rRNA gene analysis. Laboratory-scale biological deodorization experiments were conducted to test the performance of the three isolates-in the form of pure or mixed cultures, with the cells immobilized onto alginate as a carrier-in reducing the $H_2S$ from chicken manure. On the basis of 16S rRNA phylogenetic analysis, isolate AH18 was identified as Pseudomonas sp., whereas isolates AH25 and AH28 were identified as Achromobacter sp. The most active deodorizing isolate was AH18, with an $H_2S$ reduction rate of 74.7% (p < 0.05). Meanwhile, the reduction rates for isolates AH25 and AH28 were 54.2% and 60.8% (p > 0.05), respectively. However, the $H_2S$ removal performance was enhanced in the mixed culture, with a reduction rate of 81.9% (p < 0.05). In conclusion, the three potential SOB isolates were capable of reducing the $H_2S$ from chicken manure in the form of a pure culture immobilized on alginate, and the reduction performance was enhanced in the mixed culture.

      • SCISCIESCOPUS

        Performance of a continuous flow microbial reverse-electrodialysis electrolysis cell using a non-buffered substrate and catholyte effluent addition

        Hidayat, Syarif,Song, Young-Hyun,Park, Joo-Yang Elsevier 2017 Bioresource technology Vol.240 No.-

        <P><B>Abstract</B></P> <P>A continuous flow microbial reverse-electrodialysis electrolysis cell (MREC) was operated under non-buffered substrate with various flow rates of catholyte effluent into anode chamber to investigate the effects on the hydrogen gas production. Adding the catholyte effluent to the anolyte influent resulted in increased salt concentration in the anolyte influent. The increasing anolyte influent salt concentration to 0.23M resulted in improved hydrogen gas production, Coulombic recovery, yield, and hydrogen production rate to 25±1.4mL, 83±5%, 1.49±0.15mol-H<SUB>2</SUB>/mole-COD, 0.91±0.03m<SUP>3</SUP>-H<SUB>2</SUB>/m<SUP>3</SUP>-V<SUB>an</SUB>/day, respectively. These improvements were attributed to the neutral pH rather than increase in anolyte conductivity as there was no significant improvement in the reactor performance when the NaCl was directly added to the reactor. These results show that addition of catholyte effluent into the anode chamber improved the MREC performance.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The catholyte effluent used instead of buffer saline in MREC reactor. </LI> <LI> Maintain anolyte in neutral pH more necessary rather than increasing conductivity. </LI> <LI> Yield of hydrogen gas was 1.49±0.15mol-H<SUB>2</SUB>/mole-COD. </LI> <LI> Hydrogen gas production rate was 0.91±0.03m<SUP>3</SUP>-H<SUB>2</SUB>/m<SUP>3</SUP>-V<SUB>an</SUB>/day. </LI> <LI> The addition of catholyte effluent into anode chamber improved MREC performance. </LI> </UL> </P>

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