• Title/Summary/Keyword: Sampling location

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The Detection of VOCs in Effluents from Several Wastewater Treatment Plants and Industry Drains in Nakdong River Basin (낙동강 유역 일부 폐수처리장 방류수 및 공단배수로의 휘발성유기화합물(VOCs)의 분포현황)

  • Bae, Hun-Kyun
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.4
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    • pp.254-259
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    • 2012
  • The discharge characteristics of Volatile Organic Compounds (VOCs) from seven wastewater treatment plants and two industry drains at Nakdong River basin were investigated. Four Sampling campaigns were conducted between May 2008 and November 2008, and tested for 17 VOCs. As results, eight VOCs were detected at some sampling sites, but their concentration levels were low; 0.19~3.41 ${\mu}g/L$, dependent on each sampling location and substance. However, proper management plans such as supervising and monitoring systems for VOCs are needed to control those pollutants since VOCs might affect human health as well as aquatic ecosystems with extremely low concentration levels.

A Study on Indoor Radon Concentrations in Urban Area (도시 일부지역에서의 실내 라돈농도에 관한 연구)

  • 김순애;백남원
    • Journal of Environmental Health Sciences
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    • v.28 no.2
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    • pp.89-98
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    • 2002
  • This study was taken in general hospital, hotel, shopping center, underground cafe, school, house, for the purpose of investigating the distribution of indoor radon concentration in urban area, by E-PERM which approved U.S. EPA, between August and November 1999. There are two sampling Places were exceed 148 ㏃/㎥(4 pCi/L; U.S EPA remedial level), difference mean is 24.0㏃/㎥ when compared with underground vs. aboveground indoor radon concentration in the same building and ratio is 1.6, so underground area is higher than aboveground (p<0.05). Influencing factors were examined. They related to the location of sampler(detector) open or near the door is lower radon concentration than inside portion, which explains probably open area has better ventilated air and dilutes indoor radon concentration. Temperature has a negative relationship (p<0.05) with indoor radon concentration and relative humidity has a positive (p<0.05) Simultaneously to investigate water radon concentration, collected piped-water and the results were very low, which is the same in piped-water concentration other countries. In conclusion, underground indoor radon concentration is higher than aboveground. Concentration was related to sampling spot, open portion is lower than inside. Higher the temperature, lower the indoor radon concentrations. On the other hand higher the relative humidity, higher the indoor radon concentrations. Indoor radon concentration is influenced by sampling point, temperature, relative humidity.

A Case Study on Productivity Analysis and Methods Improvement for Masonry Work

  • Chang, Chul-Ki;Yoo, Wi Sung
    • Journal of the Korea Institute of Building Construction
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    • v.13 no.4
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    • pp.372-381
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    • 2013
  • In the construction industry, a great deal of research has been focused on productivity improvement because a minor change in labor productivity can often make the difference between a profit and a loss. This study shows how productivity measurement methods can be applied in practice, step by step, to analyze and identify potential problems both in productivity and methods performance for masonry work. A work sampling technique was conducted to determine the nature and extent of an observable activity as an aid to measuring overall performance. Also, a method productivity delay model was used to identify non-productivity in individual cycle times. From the work sampling technique, it was found that the masonry crew had a Labor Utilization Factor of 47.1%, and from the videotape analysis, it was found that the material and dumpster location need to be adjusted to reduce the travelling distance. We have found that efforts to improve the productivity of masonry work should be focused almost exclusively on machine and labor delays, based on the result from the method productivity delay model.

A Range-Based Monte Carlo Box Algorithm for Mobile Nodes Localization in WSNs

  • Li, Dan;Wen, Xianbin
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.11 no.8
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    • pp.3889-3903
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    • 2017
  • Fast and accurate localization of randomly deployed nodes is required by many applications in wireless sensor networks (WSNs). However, mobile nodes localization in WSNs is more difficult than static nodes localization since the nodes mobility brings more data. In this paper, we propose a Range-based Monte Carlo Box (RMCB) algorithm, which builds upon the Monte Carlo Localization Boxed (MCB) algorithm to improve the localization accuracy. This algorithm utilizes Received Signal Strength Indication (RSSI) ranging technique to build a sample box and adds a preset error coefficient in sampling and filtering phase to increase the success rate of sampling and accuracy of valid samples. Moreover, simplified Particle Swarm Optimization (sPSO) algorithm is introduced to generate new samples and avoid constantly repeated sampling and filtering process. Simulation results denote that our proposed RMCB algorithm can reduce the location error by 24%, 14% and 14% on average compared to MCB, Range-based Monte Carlo Localization (RMCL) and RSSI Motion Prediction MCB (RMMCB) algorithm respectively and are suitable for high precision required positioning scenes.

Factors Affecting Brand Values of Private Universities: A Case Study of Ho Chi Minh City University of Technology (HUTECH)

  • Le, Quang Hung
    • The Journal of Asian Finance, Economics and Business
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    • v.6 no.1
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    • pp.159-167
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    • 2019
  • The current higher education in Vietnam demonstrates the intense competition among local universities. Undoubtedly, the issue of enhancing the brand value to attract students is now placed at the top to Vietnamese universities. The research aims to identify the objective and subjective factors affecting the brand value of private universities in Ho Chi Minh City, Vietnam as mediated by students' perceptions. This paper employs the mixed research methods and data were then analyzed by measuring Cronbach's Alpha coefficient for reliability, analyzing EFA, and using PATH model to test the experiment on the research model affecting HUTECH's brand value. Probability sampling used is Stratified sampling and 500 students of 8 faculties of HUTECH surveyed by convenience sampling. Additionally, this paper also proposes some managerial implications on enhancing the brand value of private universities in Ho Chi Minh City. The results indicate that the new factor, namely geographic location is the most influential factor to enhance the brand value of private universities in general and HUTECH in particular. Brand still plays a determinant role in students' trust when choosing a university. Finally, some implications proposed to enhance the brand value of private universities in Ho Chi Minh City in the context of fierce competition in attracting students.

Effects of Gratitude and Anticipation on Satisfaction: A Case Study in Indonesia

  • NOEGROHO, Gatoet Gembiro;SUHARYONO, Suharyono;SOLIMUN, Solimun;YULIANTO, Edy
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.2
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    • pp.1215-1224
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    • 2021
  • This research aims to discuss the relationship between the courage, anticipation, and satisfaction comprehensively. This study will be complemented by gratitude as a variable that moderates the relationship between courage and anticipation, as well as the relationship between the courage and satisfaction. The large area as survey location is the reason for sampling conducted in 2 stages: (1) taking 15 districts through judgement sampling, (2) allocated sub-districts sample through proportional random sampling. The sample used in this study were 155 sub-districts in East Java. Respondents in each sub-district consisted of 1 farmer and 1 field extension officer to get a total of 310 respondents. The analysis method used to test the hypothesis was Structural Equation Modeling (SEM). The findings of this research are: (1) The courage of field extension officers' have a positive but non-significant direct effect on farmers' anticipation, however, the effect significantly strengthen with religiosity as moderation; (2) The courage of field extension officers' and farmers' anticipation have a significant and positive effect on satisfaction. This study will be complemented by gratitude as a variable that moderates the relationship between the courage and anticipation, as well as the relationship between courage and satisfaction.

Shipboard Measurements of Air Pollutants across the Yellow Sea (황해 직선 항로상 대기오염물질의 측정)

  • 이승복;배귀남;진현철;김영성;문길주;심상규
    • Journal of Korean Society for Atmospheric Environment
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    • v.20 no.1
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    • pp.33-46
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    • 2004
  • Air pollutants were measured eight times from June 1999 to June 2002 on regular ferries cruising across the Yellow Sea between Incheon in Korea and Qingdao or Tianjin in China. PM$_{10}$ and PM$_{2.5}$ were measured as particulate matters and SO$_2$, CO, and NO$_{x}$ were measured as gaseous pollutants. On each route, sampling was made, starting two hour after departure and ending two hour before arrival. Low concentrations of gaseous pollutants that were not much varied according to sampling period and location revealed that atmosphere over the sea was not directly affected by anthropogenic emissions. However, concentrations of fine particles were generally higher than those measured at Deokjeok Island, 50km west of the western seashore, at similar periods. It was believed that considerable influence of China in the form of secondary pollutants was exerted over the sea.a.a.a.

Development of Ultrasound Sector B-Scanner(II)-Digital Scan Converter- (초음파 섹터 B-스캐너의 개발(II)-디지탈 스캔 컨버터-)

  • 김주한;김영모
    • Journal of Biomedical Engineering Research
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    • v.7 no.2
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    • pp.133-138
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    • 1986
  • Abstract In a conventional digital sector scan system in the ultrasound medical imaging, the sampling space is in the polar coordinates while the display space is in the cartesian coordinates, which necessitates a coordinate transformation process resultion process resulting the overall system very complex and bulky. In this paper we propose a new architecture of the Digital-Scan-Converter (DSC) for the ultrasound sector scan system in which sampling space is the same as the display space, so the data are displayed as they are acquired without any interpola- tion process required. To implement the above real time DSC. two frequency synthesizes with very high switching time and a low-pass filter are required. The former determines the precise location of the data points and the latter fills the gap betw- een pixels in the horizontal direction.

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Flow Analysis around a Floating Cylinder in a Swirl Flow with a Stereoscopic-PIV (스테레오 PIV에 의한 원관내 선회유동중 실린더형 부유체 주위 유동 특성 해석)

  • Doh, D.H.;Hwang, T.G.;Tanaka, K.;Takei, M.
    • 유체기계공업학회:학술대회논문집
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    • 2006.08a
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    • pp.319-322
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    • 2006
  • The flow characteristics around a floating cylinder in a swirling flow field in a vertical pipe with a length of 600mm and an inner diameter of 100mm is investigated by the use of the Stereoscopic-PIV system. The measurement system consists of two cameras, a Nd-Yag laser and a host computer. Optical sensors(LEDs) were used to detect the location of the floating cylinder and to activate the Stereoscopic-PIV system. A conditional sampling Stereoscopic-PIV system was developed in which the flow fields around the floating cylinder are measured at the events of the activations. It has been verified that the motion of the floating cylinder becomes stable when the azimuthal velocity component of the swirl flow is maintained at stable states.

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Endoscopic Management of Gastric Subepithelial Tumor (위상피하종양의 내시경적 진단 및 치료)

  • Hyunchul Lim
    • Journal of Digestive Cancer Research
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    • v.10 no.1
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    • pp.16-21
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    • 2022
  • Diagnosis of gastric subepithelial tumors (SETs) is sometimes difficult with conventional endoscopy or tissue sampling with standard biopsy, so non-invasive imaging modalities such as endoscopic ultrasound (EUS) and computed tomography are used to evaluate the characteristics of SETs features (size, location, originating layer, echogenicity, shape). However imaging modalities alone is not able to distinguish among all types of SETs, so histology is the gold standard for obtaining the final diagnosis. For tissue sampling, mucosal cutting biopsy and mucosal incision-assisted biopsy and EUS-guided fine-needle aspiration or biopsy (EUS-FNA or EUS-FNB) is commonly recommended. Endoscopic mucosal resection (EMR) and endoscopic submucosal dissection (ESD) are used for resection of SETs involving the mucosal and superficial submucosal layers, could not treat adequately and safely the SETs involving the deep mucosa and muscularis propria. Submucosal tunneling endoscopic resection (STER) and endoscopic full-thickness resection (EFTR) is used as a therapeutic option for the treatment of SETs with the development of reliable endoscopic closure techniques and tools.