GLOBAL FINANCIAL CRISIS AND FOREIGN DEVELOPMENT ASSISTANCE SHOCKS IN LEAST DEVELOPING COUNTRIES

DEBASISH KUMAR DAS,CHAMPA BATI DUTTA 중앙대학교 경제연구소 2013 Journal of Economic Development Vol.38 No.2

This paper evaluates whether the exogenous component of the global financial crisis affects OECD-DAC EU donor countries ODA disbursements to the LDCs and how it impacts on LDCs economic prosperity. Using both static and dynamic panel techniques, we find that global financial crisis in OECD-EU donor countries are causes for the significant downside of ODA flows to the LDCs. Consequently it adversely affects through the various transmission channels (e.g., ODA disbursements, remittances, bilateral financial flows, export growth) to the LDCs economic growth. Our results also explore that due to countercyclical role of ODA flows from the donors’ largely affect to the LDCs economic development process negatively. The robustness checks using alternative estimation technique supports our original estimation results in every context.

Effect of internal angles between limbs of cross plan shaped tall building under wind load

Kumar, Debasish,Dalui, Sujit Kumar Techno-Press 2017 Wind and Structures, An International Journal (WAS Vol.24 No.2

The present study revealed comparison the pressure distribution on the surfaces of regular cross plan shaped building with angular cross plan shaped building which is being transformed from basic cross plan shaped building through the variation of internal angles between limbs by $15^{\circ}$ for various wind incidence angle from $0^{\circ}$ to $180^{\circ}$ at an interval of $30^{\circ}$. In order to maintain the area same the limbs sizes are slightly increased accordingly. Numerical analysis has been carried out to generate similar nature of flow condition as per IS: 875 (Part -III):1987 (a mean wind velocity of 10 m/s) by using computational fluid dynamics (CFD) with help of ANSYS CFX ($k-{\varepsilon}$ model). The variation of mean pressure coefficients, pressure distribution over the surface, flow pattern and force coefficient are evaluated for each cases and represented graphically to understand extent of nonconformities due to such angular modifications in plan. Finally regular cross shaped building results are compared with wind tunnel results obtained from similar '+' shaped building study with similar flow condition. Reduction in along wind force coefficients for angular crossed shaped building, observed for various skew angles leads to develop lesser along wind force on building compared to regular crossed shaped building and square plan shaped building. Interference effect within the internal faces are observed in particular faces of building for both cases, considerably. Significant deviation is noticed in wind induced responses for angular cross building compared to regular cross shaped building for different direction wind flow.

Aerodynamic modifications for reduction of wind loads on cross plan shaped tall building

Debasish Kumar,Sujit Kumar Dalui 한국풍공학회 2021 Wind and Structures, An International Journal (WAS Vol.33 No.2

Corner modification plays an essential role in the reduction of the wind load and responses on tall buildings. The present study investigates the effectiveness of different corner modifications (chamfered, rounded, and recessed corners) to reduce the wind load on regular cross plan shaped tall buildings using the computation fluid dynamics technique. Here, ANSYS CFX is used to simulate the boundary layer wind environment around the building and compared with experimental results. The numerically simulated data are compared with some previous wind tunnel test data on the ‘+’ plan building. Based on the numerical study, flow pattern near the corner regions, pressure contour, the variation of pressure coefficient along the periphery of the building, force and moment coefficients for three corner modified models are analyzed and compared with sharp edged cross plan shaped model to comprehend the extent of nonconformities due to corner modifications. The rounded corner modification is most effective in suppressing the wind load compared to chamfered and recessed corners. For rounded corners with 50% corner cut, the reduction in force and moment coefficients is substantial, with up to 26.26% and 28.58%, respectively, compared to sharp edged corners. A sudden shoot up in the negative Cp values near edges of the corner modified model, should require special attention in the design of cladding components. This paper led to comprehend the wind-induced responses of cross plan shaped building with various corner configurations.

The consolidation of deep tube well technology in safe drinking water provision: the case of arsenic mitigation in rural Bangladesh

Debasish Kumar Kundu,Bas J.M. van Vliet,Aarti Gupta 기술경영경제학회 2016 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.24 No.2

This paper explains why and how deep tube well as a safe drinking water technology hasbecome dominant in mitigating the arsenic crisis in rural Bangladesh. We do so by applyinginsights from the Multi-Level Perspective on transitions in explaining changes in the safesocio-technical drinking water regime in rural Bangladesh. Data about seven dimensions ofregime change were gathered from key actors through in-depth interviews, focus groupssessions, a survey, and a workshop. The findings reveal that with the introduction of deeptube well as an arsenic mitigation technology, the observed changes in the seven dimensionshelp to transform the existing safe drinking water regime in order to re-stabilise it. Technological attributes, symbolic meaning, industry structures, and techno-scientificknowledge have supported an evolving dominance of the deep tube well. Besides, userpractices as well as related infrastructures have adapted to the use of deep tube wells, andnew policies stimulated its application. We argue that the dimensions of the technologychange in the existing regime are consistent with the features of incremental innovation. Byoffering such insights, we show the relevance of the Multi-Level Perspective on transitionsto analyse socio-technical innovation in a developing world context.

Effect of internal angles between limbs of cross plan shaped tall building under wind load

Debasish Kumar,Sujit Kumar Dalui 한국풍공학회 2017 Wind and Structures, An International Journal (WAS Vol.24 No.2

The present study revealed comparison the pressure distribution on the surfaces of regular cross plan shaped building with angular cross plan shaped building which is being transformed from basic cross plan shaped building through the variation of internal angles between limbs by 15 for various wind incidence angle from 0 to 180 at an interval of 30. In order to maintain the area same the limbs sizes are slightly increased accordingly. Numerical analysis has been carried out to generate similar nature of flow condition as per IS: 875 (Part –III):1987 (a mean wind velocity of 10 m/s) by using computational fluid dynamics (CFD) with help of ANSYS CFX (k-e model). The variation of mean pressure coefficients, pressure distribution over the surface, flow pattern and force coefficient are evaluated for each cases and represented graphically to understand extent of nonconformities due to such angular modifications in plan. Finally regular cross shaped building results are compared with wind tunnel results obtained from similar \'+\' shaped building study with similar flow condition. Reduction in along wind force coefficients for angular crossed shaped building, observed for various skew angles leads to develop lesser along wind force on building compared to regular crossed shaped building and square plan shaped building. Interference effect within the internal faces are observed in particular faces of building for both cases, considerably. Significant deviation is noticed in wind induced responses for angular cross building compared to regular cross shaped building for different direction wind flow.

아플라톡신 B1의 인간 정상세포주에 대한 ROS유도를 통한 세포사명 촉진

데바쉬스쿠말데이 ( Debasish Kumar Dye ),강선철 ( Sun Chul Kang ) 한국환경농학회 2020 한국환경농학회 학술대회집 Vol.2020 No.-

Mycotoxin contamination of food and water is a serious global concern. Aflatoxin B1 (AFB1) is a deadly mycotoxin that contaminates both food and water bodies in the environment. AFB1 is reported to cause severe health issues, including hepatotoxicity, teratogenicity, and immunotoxicity in humans; however, the mechanistic effects against the normal human cells are not fully understood. To this aim, AFB1 contamination consequences were studied on a human normal cell skin and colon lines (HaCaT and CCD 841 CoN, respectively). Our results clearly indicate that concentrations of AFB1 greater than 10 ㎛ are toxic to HaCaT and CCD 841 CoN cells. Morphological changes of HaCaT and CCD 841 CoN cells were clearly observed after exposure to AFB1. Particularly in HaCaT cells, treatment with 50 ㎛ and 100 ㎛ AFB1 induces oxidative stress by excessive endogenous free-radical production such as ROS and NO generation. These consequences accelerate the ROS-dependent DNA damage events, which subsequently result in caspase mediated programmed cell death. Collectively, results of the current study indicate that AFB1 exposure to normal human cells triggered the programmed cell death machinery via ROS mediated pathway.

건강한 양어관리를 위한 Weissella confusa DD_A7 균주의 유익효과

데바쉬스쿠말데이 ( Debasish Kumar Dey ),강선철 ( Sun Chul Kang ) 한국환경농학회 2018 한국환경농학회 학술대회집 Vol.2018 No.-

In the last few decades, the attempts to sustain an environmental friendly aquaculture have encouraged the usage of beneficial bacteria, including probiotics, as feed enrichment or added in the formulation of commercial diets. Probiotics constitute a different approach to prevent diseases in fish and shows numerous of beneficial impacts, on the development, survival, immunological responses, and on the enhancement of general well-being of the host. The dietary supplementation of Weissella confusa (DD_A7) has not been evaluated in zebrafish model, thus, the objective of the study was to evaluate its effect on the growth, and innate immune responses. In this study, the toxic effect of the ESBL positive E. coli has been proved in-vivo (6 dpf zebrafish larva model). The morphological changes, increase in the inflammatory factors, and H2DFFDA staining validate the toxic effect of the pathogens, which was further shown a significant reduction upon treatment with DD_A7 in-vitro (RAW 264.7 cell line). The so far obtained results clearly demonstrated the beneficial effects of DD_A7 on the zebrafish; upon feeding of probiotic to the fish, the immune system was observed to be significantly modulated (p < 0.01, p < 0.001), and the observed protective characteristic of the probiotic has shown some correlation with reduction of host inflammation response. Moreover, the fish has found to be resistance towards the stress compared to the control after treatment. This brings the interest for the usage of DD_A7 as an alternative strategy for the management of a healthy fish Farming and the prevention of culture environment from the infection.

Enhanced lipid content in Chlorella sp. FC2 IITG via high energy irradiation mutagenesis

Debasish Das,Baskar Selvaraj,Basavaraj Palabhanvi,Vikram Kumar,Muthusivaramapandian Muthuraj 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1

High energy ultra-violet radiation was used to induce mutations in the wild type strain Chlorella sp. FC2 IITG and the mutants obtained were screened for enhanced lipid content targeted towards biodiesel production. Screening of mutants under nitrogen starved photoautotrophic condition showed five mutant strains with higher lipid content as compared to the wild type strain. Maximum neutral lipid content of 22.26% (w/w, DCW) was found for FC2-25UV mutant strain, which was 48.4% higher than that of wild type culture. Further characterization under photoautotrophic two stage high cell density cultivation of lipid rich FC2-25UV resulted in total lipid content of 68% (w/w, DCW), which was 21.43% higher than the wild type strain with a marginal improvement of 11% in the total lipid productivity. Comparison of enzyme activity assays under nitrogen starved conditions in both the strains revealed an 18.2% and 31.25% increase in acetyl CoA carboxylase and di-acyl-glycerol transferase activity of mutant. The FAME composition analysis showed 41.5% and 24% increase in the fractions of C18:2 and C18:1 in the mutant strain when compared to the wild type strain with no significant difference in the other FAME fractions. Thus, the mutant strain could be a potential candidate for biodiesel production.

Hypoxia Responsive Nanoparticles-based Drug Delivery System Capable of Combinational Chemo-photodynamic Therapy

Hoomin LEE,Debasish KUMAR,Kwanwoo KIM,Suheon KIM,Eunsu KIM,Sun Chul KANG,Vivek K. BAJPAI,Yun Suk HUH 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.4

Metasequoia glyptostroboides extract enhances the anticancer effect by using intrinsic apoptosis pathways

김관우,김은수,이후민,한영규,( Debasish Kumar Dey ),강선철,허윤석 한국공업화학회 2021 한국공업화학회 연구논문 초록집 Vol.2021 No.-