베트남의 Facebook 소셜 네트워크를 통한 기후변화 대응 평가

Tran Thi Mai Phuong,Nguyen Khac1,이달희,박태윤,한신 대한지구과학교육학회 2019 대한지구과학교육학회지 Vol.12 No.1

전 세계에서 베트남은 기후 변화에 가장 큰 영향을 받는 국가 중 하나이다. 현재 베트남의 기후 변화에 대 한 대응 활동은 텔레비전, 신문, 라디오, 인터넷 등과 같은 미디어에 의존하고 있다. Facebook은 베트남 사 람들이 가장 많이 사용는 소셜 네트워크이다 (베트남 의 페이스북 이용자는 5800만명으로 세계 7위). 그러 나 상대적으로 그것을 기후변화 대응에 이용하고자 하 는 관심은 적은편이다. 이 논문에서는 Facebook의 Audience Insight Tool(AIT)과 온라인 사회학 조사 방법 을 활용하여 Facebook을 통한 기후 변화 대응 활동의 현재 상태 및 효율성을 평가했다. 베트남 Facebook의 기후 변화 대응 팬 페이지의 수는 15개 정도이며, 그중 가장 인기 있는 곳의 팔로워 수가 94,721명에 이른다. 이 연구에서는 베트남에서 가장 방문자가 많은 기후 변화 대응 팬 페이지 2곳을 조사하고 평가 한 결과, Facebook을 통한 기후 변화 대응은 예상 한 것만큼 큰 효과가 없었다. 또한 온라인 설문 조사를 통해 이러한 문제의 원인을 파악해 보고자 하였다. 이 결과는 앞으 로 기후 변화 대응을 할 때 Facebook과 같은 소셜 네트 워크의 강점을 부각시키면서 해결책을 찾고자 하는 기 관들에게 과학적인 밑거름이 될 것이다. Vietnam is one of the countries most affected by climate change. Therefore, communication activities on climate change in Vietnam are focused with various media such as television, newspapers, radio, internet etc. In particular, Facebook social network is a potential media but less interested and developed. In this topic, Audience Insight tool of the Facebook social network and the online sociological survey method were conducted to assess the current status and effectiveness of climate change communication activities via Facebook in Vietnam today. Vietnam ranks seventh in the world with 58 million users. However, the number of climate change communication fanpages has only about 15 fanpages with the largest number of followings is 94,721 persons. Among of the 10 most contented Facebook users in Vietnam today, there is no fanpage related to climate change. The results of research and evaluation two fanpages of climate change communication that are the most and most frequent followers in Vietnam showed that climate change communication via Facebook in Vietnam is not as effective as expected. At the same time, online survey results also pointed out the causes of the above problems. This is the scientific basis for management agencies to find the solutions to promote the strength of Facebook social network in climate change communication in the future.

Trade Liberalization Schedules and Members' Development Characteristics: How are They Connected and Why do They Matter to Trade Agreements?

Khac Lich Hoang(Khac Lich Hoang ),Duc Bao Nguyen(Duc Bao Nguyen ) 세종대학교 경제통합연구소 2022 Journal of Economic Integration Vol.37 No.4

This study examines whether the length of the implementation periods of regional trade agreement (RTA) in relation to trade liberalization schedules and the level of development of member countries affect members' trade. The analysis finds that RTAs formed by partner countries with a similar level of economic development lead to increased trade among members than among North-South RTAs during a shorter transition period of trade and tariff liberalization, regardless of the degree of integration being shallow or deep. The average long-term effects of RTAs formed by developing countries on members' trade diminish 15 years after their implementation. In distinguishing trade direction from developed to developing countries and vice versa, we noted that direction-specific South-North RTAs appear to take less time to see larger increases in Southern exports to the Northern members than direction-specific North-South RTAs do.

Spatial Interpolation and Assimilation Methods for Satellite and Ground Meteorological Data in Vietnam

( Khac Phong Do ),( Ba Tung Nguyen ),( Xuan Thanh Nguyen ),( Quang Hung Bui ),( Nguyen Le Tran ),( Thi Nhat Thanh Nguyen ),( Van Quynh Vuong ),( Huy Lai Nguyen ),( Thanh Ha Le ) 한국정보처리학회 2015 Journal of information processing systems Vol.11 No.4

This paper presents the applications of spatial interpolation and assimilation methods for satellite and ground meteorological data, including temperature, relative humidity, and precipitation in regions of Vietnam. In this work, Universal Kriging is used for spatially interpolating ground data and its interpolated results are assimilated with corresponding satellite data to anticipate better gridded data. The input meteorological data was collected from 98 ground weather stations located all over Vietnam; whereas, the satellite data consists of the MODIS Atmospheric Profiles product (MOD07), the ASTER Global Digital Elevation Map (ASTER DEM), and the Tropical Rainfall Measuring Mission (TRMM) in six years. The outputs are gridded fields of temperature, relative humidity, and precipitation. The empirical results were evaluated by using the Root mean square error (RMSE) and the mean percent error (MPE), which illustrate that Universal Kriging interpolation obtains higher accuracy than other forms of Kriging; whereas, the assimilation for precipitation gradually reduces RMSE and significantly MPE. It also reveals that the accuracy of temperature and humidity when employing assimilation that is not significantly improved because of low MODIS retrieval due to cloud contamination.

Spatial Interpolation and Assimilation Methods for Satellite and Ground Meteorological Data in Vietnam

Do, Khac Phong,Nguyen, Ba Tung,Nguyen, Xuan Thanh,Bui, Quang Hung,Tran, Nguyen Le,Nguyen, Thi Nhat Thanh,Vuong, Van Quynh,Nguyen, Huy Lai,Le, Thanh Ha Korea Information Processing Society 2015 Journal of information processing systems Vol.11 No.4

This paper presents the applications of spatial interpolation and assimilation methods for satellite and ground meteorological data, including temperature, relative humidity, and precipitation in regions of Vietnam. In this work, Universal Kriging is used for spatially interpolating ground data and its interpolated results are assimilated with corresponding satellite data to anticipate better gridded data. The input meteorological data was collected from 98 ground weather stations located all over Vietnam; whereas, the satellite data consists of the MODIS Atmospheric Profiles product (MOD07), the ASTER Global Digital Elevation Map (ASTER DEM), and the Tropical Rainfall Measuring Mission (TRMM) in six years. The outputs are gridded fields of temperature, relative humidity, and precipitation. The empirical results were evaluated by using the Root mean square error (RMSE) and the mean percent error (MPE), which illustrate that Universal Kriging interpolation obtains higher accuracy than other forms of Kriging; whereas, the assimilation for precipitation gradually reduces RMSE and significantly MPE. It also reveals that the accuracy of temperature and humidity when employing assimilation that is not significantly improved because of low MODIS retrieval due to cloud contamination.

Fuzzy-AHP Application in Analyzing the Factors Affecting Quality of Rural Labor

HOANG, Lich Khac,NGUYEN, Kien The Korea Distribution Science Association 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.8

This paper aims to investigate the factors affecting the quality of rural labor in Vietnam, a case study in Thai Nguyen province. For this purpose, we establish an integrated framework of factors affecting the quality of rural labor. We use Fuzzy analytic hierarchy process (Fuzzy-AHP) to assess the weight of the criteria and sub-criteria of rural labor quality. This method introduced by Saaty (1987) is a useful tool to cope with the complexity of decision-making. The Fuzzy-AHP is one of the most common Multi-Criteria Decision-Making instruments for dealing with quantifiable and intangible criteria, which reflect the relative importance of the alternatives based on constructing a pairwise comparison matrix. The results show that the four most weighted factors are institutions, local government policies, technical qualifications, and mentality. In particular, the weight of the institution is the largest (0.2343), meaning that this factor is the most important one affecting the quality of rural labor in Thai Nguyen province. The weight of local government policy is close to that of institution, about 0.2259. The weights of technical qualification and mentality are 0.1238 and 0.1135, respectively. In addition, age and education levels do not significantly affect the rural labor quality of Thai Nguyen province.

Effect of Pb Subtitution for Bi-based(2223) Superconductors Prepared by Improved Sol-gel Technique

Nguyen Thi Mua,Nguyen Khac Man,Than Duc Hien,Chu Duc Hien 한국자기학회 2007 한국자기학회 학술연구발표회 논문개요집 Vol.- No.-

Experimental Investigation of ECDM for Fabricating Micro Structures of Quartz

Nguyen, Khac-Ha,Lee, Pyeong An,Kim, Bo Hyun Korean Society for Precision Engineering 2015 International Journal of Precision Engineering and Vol.16 No.1

Recently, the utilization of electrochemical discharge machining (ECDM) has proved to have potential for enhancing the machining efficiency and accuracy of micro-drilling and milling for glass. However, there is a lack of information about the machining conditions for milling in quartz materials, which have different characteristics than glass. In ECDM, gas film and sparks are generated on a tool when voltage is applied between the tool and a counter electrode. Workpiece materials are removed mainly by the heat of the sparks. The spark generation is affected by both the voltage and electrolyte conditions. This study investigated the ECDM characteristics according to machining parameters, such as electrolyte level, electrolyte concentration, pulse voltage, offset pulse voltage, pulse on-time, pulse off-time, and tool feedrate. Surface roughness and sharpness of the rims and edges were observed under different machining conditions. Based on the investigation of the machining conditions, micro structures, including micro grooves and columns, were machined on quartz material.

Efficacy and Safety of Outpatient Clinic-based Elective External Electrical Cardioversion in Patients with Atrial Fibrillation

Nguyen Khac Le Son,Je-Wook Park,김민,Song Yi Yang,Hee Tae Yu,Taehoon Kim,Jae-Sun Uhm,Boyoung Joung,Moon-Hyoung Lee,Hui-Nam Pak 대한심장학회 2020 Korean Circulation Journal Vol.50 No.6

Background and Objectives: Little is known about the outcomes of outpatient clinic-based elective external cardioversion (OPC-ECV) for persistent atrial fibrillation (PeAF). We investigated the acute, short-term, and long-term elective external cardioversion (ECV) outcomes. Methods: We included 1,718 patients who underwent OPC-ECV (74% male, 61.1±11.0 years old, 90.9% long-standing PeAF, 9.1% after atrial fibrillation [AF] ablation) after excluding patients with atrial tachycardia or inappropriate antiarrhythmic drug medication, and in-patient ECV. Biphasic shocks were delivered sequentially until successful cardioversion was achieved (70-100-150-200-250 J). If ECV failed at 150 J, we administered intravenous amiodarone 150 mg and delivered 200 J. Results: ECV failed in 11.4%, and the complication rate was 0.47%. Within 3 months, AF recurred in 55.5% (44.7% as sustaining AF, 10.8% as paroxysmal AF), and the AF duration was independently associated (odds ratio [OR], 1.01 [1.00–1.02]; p=0.006), but amiodarone was independently protective (OR, 0.46 [0.27–0.76]; p=0.002, Log rank p<0.001) against an early recurrence. Regarding the long-term recurrence, pre-ECV heart failure was protective against an AF recurrence (hazard ratio, 0.63 [0.41–0.96], p=0.033) over 32 (9–66) months of follow-up. ECV energy (p<0.001) and early recurrence rate within 3 months (p=0.007, Log rank p=0.006) were significantly lower in post-ablation patients than in those with long-standing persistent AF. Conclusions: The success rate of OPC-ECV was 88.6%, and the complication rate was low. However, AF recurred in 55.5% within 3 months. Amiodarone was protective against short-term AF recurrences, and long-term AF recurrences were less in patients with baseline heart failure.

EM Impedance-based Tension Monitoring of Cable-Anchorage in Mooring System of Offshore Structure

Khac-Duy Nguyen,Po-Young Lee,Jeong-Tae Kim 대한조선학회 2011 대한조선학회 학술대회자료집 Vol.2011 No.6

For offshore structure moored by cable system, the stability of the structure is dependent on tensile force of the cables. The loss of cable force may result in large displacement and unbalance of the structure. This study presents an electromechanical impedance-based method for tension monitoring of cable-anchorage in mooring system of offshore structure. In order to achieve the objective, the following approaches are implemented. Firstly, an PZT-Interface is introduced to monitor tensile force of cable. Once installed into the cable-anchorage, the PZT-interface works like a cantilever plate with imperfectly fixed boundary. The loss of cable force is represented by the weakness of the fixed boundary. Secondly, the variations of electromechanical (EM) impedance of the PZT-interface due to the variations of cable force are investigated. Several index like root mean square deviation, correlation coefficient deviation and frequency shift are utilized to capture these changes. Finally, the feasibility of the method is evaluated on a lab-scale cable-anchorage model.

Damage detection in beam-type structures via PZT’s dual piezoelectric responses

Khac-Duy Nguyen,김정태,Duc-Duy Ho 국제구조공학회 2013 Smart Structures and Systems, An International Jou Vol.11 No.2

In this paper, practical methods to utilize PZT’s dual piezoelectric effects (i.e., dynamic strain and electro-mechanical (E/M) impedance responses) for damage detection in beam-type structures are presented. In order to achieve the objective, the following approaches are implemented. Firstly, PZT material’s dual piezoelectric characteristics on dynamic strain and E/M impedance are investigated. Secondly, global vibration-based and local impedance-based methods to detect the occurrence and the location of damage are presented. Finally, the vibration-based and impedance-based damage detection methods using the dual piezoelectric responses are evaluated from experiments on a lab-scaled beam for several damage scenarios. Damage detection results from using PZT sensor are compared with those obtained from using accelerometer and electric strain gauge.