• Title/Summary/Keyword: Monitoring and Controlling

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Exploration on Risk and Protective Factors of Adolescent Runaway (청소년 가출의 위험요인과 보호요인 탐색)

  • Sang-chul Han
    • Korean Journal of Culture and Social Issue
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    • v.14 no.1_spc
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    • pp.273-298
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    • 2008
  • The purpose of this study is to explore a risk and a protective factors of adolescent runaway based on the previous researches. Runaway of adolescents is increasing, and it is longer and more habit gradually than past. The prevailance methods of runaway is no longer effects on the decrease of adolescent runaway. Now there is to accept adolescent runaway, and has to support the difficult life conditions and the emotional distress of adolescent post-runaway. This means that must be identify and treatment the protective factors having an buffering effect as well as the risk factors influencing on runaway. Although the worse factors related family are the highest risk factors of runaway, others factors including negative peer relation, a academic stress also an have significant influence on runaway. And the protective factors mediating the negative influence of risk factors are an monitoring and controlling of parent as authoritative rearing attitude, a social support, a positive coping strategies, a self-esteem, and a conventional peer group. Protective factors prevent from runaway behavior, as well as improve a resilience of adolescents in the poor environment. The tasks of follow study are to investigate empirically the mediating effects of the protective factors on the problem behavior of post-runaway and resilience of runaway adolescents based on the systematic research design.

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A Study on Automatic Bridge Lantern Support for Safe Bridge Lantern Inspection (안전한 교량등 점검을 위한 자동 교량등 지지대에 관한 연구)

  • Min-Yong Lim;Seung-Gi Gug
    • Journal of Navigation and Port Research
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    • v.48 no.4
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    • pp.267-273
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    • 2024
  • Bridge lanterns are installed on bridges or piers to signal the presence of these structures on navigational routes and navigable waters, and they fall under the category of light wave signals in Aids to Navigation. In Korea, medium to large bridges installed over major rivers and seas are equipped with bridge lanterns, which are necessary for routes frequented by ships and require periodic inspections on a monthly or multi-month basis. However, most bridge lanterns are mounted externally on bridge railings as fixed or manual rotary supports, posing a high risk of fatal falls during inspections. Furthermore, high -traffic bridges demand quick maintenance works due to complaints about traffic disruption, thus increasing work hazards. Consequently, this study introduced a tailored automatic bridge lantern support concept based on different types of bridge lantern installations, aiming for safe and rapid inspections. Additionally, the study sought to achieve full automation of the bridge lighting system by integrating it with a management program for monitoring and controlling bridge lanterns, utilizing both wired and wireless communication technologies. These findings provide foundational design data for new and refurbished bridges that will be installed in the future.

Impacts of Combined Hydrogeological and Chemical Heterogeneities on the Transport of Leachate through Landfill Sites (수리지질학적, 화학적 특성의 복합 불균질성이 매립지반 내 침출수 이동에 미치는 영향)

  • Lee, Kun-Sang
    • Journal of Korean Society of Environmental Engineers
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    • v.31 no.4
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    • pp.300-307
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    • 2009
  • The transport of landfill leachate in the subsurface formations of unlined landfill sites is considered. The impacts of hydrogeological and chemical heterogeneities on the leachate transport are assessed by examining the results from a series of Monte-Carlo simulations. The landfill system simulated in this study is hypothetically represented with three levels of spatial variability for the hydrogeological and chemical parameter; (1) homogeneous hydraulic conductivity (K) and distribution coefficient ($K_d$), (2) K heterogeneity only, and (3) combined heterogeneities of K and $K_d$. To calculate the transport of leachate through negatively-correlated random hypothetical K-$K_d$ fields generated using geostatistical input parameters, a saturated flow model is linked with a contaminant transport model. Point statistic values such as mean, standard deviation, and coefficient of variation of the concentration were obtained from 100 Monte-Carlo trials. Results of point statistics show that the heterogeneities of K and $K_d$ in the landfill site prove to be an important parameter in controlling leachate concentrations. Consideration of combined K and $K_d$ heterogeneities results in enhancing the variability of contaminant transport. The variability in the leachate concentration for different realizations also increases as the distance between source and monitoring well increase.

Classification Tree Analysis to Assess Contributing Factors Influencing Biosecurity Level on Farrow-to-Finish Pig Farms in Korea (분류 트리 기법을 이용한 국내 일괄사육 양돈장의 차단방역 수준에 영향을 미치는 기여 요인 평가)

  • Kim, Kyu-Wook;Pak, Son-Il
    • Journal of Veterinary Clinics
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    • v.33 no.2
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    • pp.107-112
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    • 2016
  • The objective of this study was to determine potential contributing factors associated with biosecurity level of farrow-to-finish pig farms and to develop a classification tree model to explore how these factors related to each other based on prediction model. To this end, the author analyzed data (n = 193) extracted from a cross-sectional study of 344 farrow-to-finish farms which was conducted between March and September 2014 aimed to explore swine disease status at farm level. Standardized questionnaires with information about basic demographical data and management practices were collected in each farm by on-site visit of trained veterinarians. For the classification of the data sets regarding biosecurity level as a dependent variable and predictor variables, Chi-squared Automatic Interaction Detection (CHAID) algorithm was applied for modeling classification tree. The statistics of misclassification risk was used to evaluate the fitness of the model in terms of prediction results. Categorical multivariate input data (40 variables) was used to construct a classification tree, and the target variable was biosecurity level dichotomized into low versus high. In general, the level of biosecurity was lower in the majority of farms studied, mainly due to the limited implementation of on-farm basic biosecurity measures aimed at controlling the potential introduction and transmission of swine diseases. The CHAID model illustrated the relative importance of significant predictors in explaining the level of biosecurity; maintenance of medical records of treatment and vaccination, use of dedicated clothing to enter the farm, installing fence surrounding the farm perimeter, and periodic monitoring of the herd using written biosecurity plan in place. The misclassification risk estimate of the prediction model was 0.145 with the standard error of 0.025, indicating that 85.5% of the cases could be classified correctly by using the decision rule based on the current tree. Although CHAID approach could provide detailed information and insight about interactions among factors associated with biosecurity level, further evaluation of potential bias intervened in the course of data collection should be included in future studies. In addition, there is still need to validate findings through the external dataset with larger sample size to improve the external validity of the current model.

Development of Interlocking Signal Simulator for Verification of Naval Warship Engineering Control Logics (함정 통합기관제어체계의 제어로직 검증을 위한 연동신호 시뮬레이터 개발)

  • Lee, Hunseok;Son, Nayoung;Shim, Jaesoon;Oh, Jin-Seok
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.8
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    • pp.1103-1109
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    • 2021
  • ECS is a control device so that the warship can perform the mission stably by controlling and monitoring the entire propulsion system. As the recent provisions of the warship, it's propelling system is complicated than past, as the demand performance and mission of the warships are diverse. In accordance with the complicated propulsion system configuration, the demand for automatic control function of the ECS is increasing for convenient and stable propulsion system control for convenient and stable. As a result, verification of ECS stability and reliability is required. In this paper, we develop an interlocking signal simulator for verifying ECS control logic and communication protocol for warship with CODLOG propulsion systems. The simulator developed was implemented to simulate a signal of gas turbine, propulsion motors, diesel generator and 11 kinds of auxiliary equipment. The reliability of ECS was verified through the ECS communication program and the I/O signal static test with the simulator.

Fabrication of 3D Paper-based Analytical Device Using Double-Sided Imprinting Method for Metal Ion Detection (양면 인쇄법을 이용한 중금속 검출용 3D 종이 기반 분석장치 제작)

  • Jinsol, Choi;Heon-Ho, Jeong
    • Clean Technology
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    • v.28 no.4
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    • pp.323-330
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    • 2022
  • Microfluidic paper-based analytical devices (μPADs) have recently been in the spotlight for their applicability in point-of-care diagnostics and environmental material detection. This study presents a double-sided printing method for fabricating 3D-μPADs, providing simple and cost effective metal ion detection. The design of the 3D-μPAD was made into an acryl stamp by laser cutting and then coating it with a thin layer of PDMS using the spin-coating method. This fabricated stamp was used to form the 3D structure of the hydrophobic barrier through a double-sided contact printing method. The fabrication of the 3D hydrophobic barrier within a single sheet was optimized by controlling the spin-coating rate, reagent ratio and contacting time. The optimal conditions were found by analyzing the area change of the PDMS hydrophobic barrier and hydrophilic channel using ink with chromatography paper. Using the fabricated 3D-μPAD under optimized conditions, Ni2+, Cu2+, Hg2+, and pH were detected at different concentrations and displayed with color intensity in grayscale for quantitative analysis using ImageJ. This study demonstrated that a 3D-μPAD biosensor can be applied to detect metal ions without special analysis equipment. This 3D-μPAD provides a highly portable and rapid on-site monitoring platform for detecting multiple heavy metal ions with extremely high repeatability, which is useful for resource-limited areas and developing countries.

A Status Survey and Improvement Plan for the Science Education in Vocational High Schools (실업계 고등학교 과학교육의 실태분석과 개선방안)

  • Pak, Sung-Jae;Kwon, Jae-Sool;Kim, Chang-Sik;Oh, Dae-Sub;Woo, Jong-Ok;Lee, Wha-Kuk;Cho, Hee-Hyung
    • Journal of The Korean Association For Science Education
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    • v.8 no.1
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    • pp.1-22
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    • 1988
  • The educational policy of a nation should be based on the results of nation-wide studies and their analyses. This study is the third one in a series of research on "development of improvement plan and monitoring system for secondary school science", focusing on the three major areas, such as students' achievements, science instruction and conditions for science education in vocational high schools. In general, the results showed that science achievements in vocational high schools were significantly lower than those of general high schools. While the achievement level in physics was lower by one percent, the achievement levels in chemistry and biology were significantly lower by more than 5 percents. In the case of scientific inquiry, the results showed much lower scores compared to those of general high schools. Concerning the inquiry abilities, most of the students did not possess the formal operational thinking skills such as controlling variables and combinatorial thinking. The ability of experimental skills seemed to be closely related to the students' majors. Students in industrial arts schools could measure electric resistance very well, while students in agricultural high school students failed completely. In the area of students' attitude toward science, the greater part of the students had the experiences of using scientific equipments (68.6 %), experimentation (54.3 %), and extracurricular science activities (56.9 %). They also showed positive attitude towards the nature of science (59.8%). The results of the survey on science instruction and school conditions for science education showed the needs for improvement In general, the priority of science education in vocational high schools was very low compared to their major subjects. The teachers as well as students thought science text books nor to be difficult These responses and the low achievement levels seemed to be contradictory to each other. The facilities for science experiments were better equipped and installed to general high schools. However. the lack of budget was a major problem for performing experiments uning the facilities. Therefore. science education in vocational high school have many things to be improved For the improvement of science education in vocational high schools, financial support as well as the intention for the improvement must be the essential factors.

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Mechanical Properties and Field Implementation of Floor Mortar Incorporated with VAE Polymer (VAE 폴리머를 이용한 모르타르 바닥재의 역학적 특성과 현작 적용성)

  • Bang, Jin-Wook;Lee, Sun-Mok;Kim, Yun-Yong
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.21 no.3
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    • pp.27-34
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    • 2017
  • Recently, the importance of the industrial warehouse floor has been increasing due to the development of the distribution and logistics industry. In this present study, an early-hardening polymer floor mortar which can compensate for the limitation of conventional cement based floor mortar regarding fluidity and long curing time was developed. In order to achieve the early-hardening of mortar characteristic ultra rapid hardening cement was used as binder. Four types of mixture proportions in accordance with the vinyl acetate ethylene(VAE) polymer contents with range from 10% to 20% and the other proto proportion without VAE polymer were designed. Mechanical experiments including the fluidity test, compressive strength test, bending test, bond test, and abrasion test were conducted for all mixture proportions. From the flow test result, it was possible to achieve the high flow with 250 mm by controlling the amount of superplasticizer. The incorporation of VAE polymer was found to affect the compressive strength reduction, however, the flexural strength was higher than that of the proto mixture, and it was evaluated to increase the compressive strength / flexural strength ratio. Moreover, at least 2.6 times higher bond strength and more than 4 times higher abrasion resistance were secured. From the mechanical experiments results, the optimum mixing ratio of the VAE polymer was determined to be 10%. As a result of application and monitoring, it shows that it has excellent resistance to cracking, discoloration, impact, and scratch as well as bond performance compared to the cement based floor mortar.

Investigation of the Effect of Weirs Construction in the Han River on the Characteristics of Sediments (보 설치가 퇴적물 특성에 미치는 영향에 관한 연구)

  • Kang, Min Kyoung;Choi, In Young;Park, Ji Hyoung;Choi, Jung Hyun
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.9
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    • pp.597-603
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    • 2012
  • To investigate the effects of weir construction on sediment characteristics of river bed, we conducted sediments sampling on the 9 locations near the weir, Kangchun, Yuju and Ipo in Namhan-River. Physical and chemical characteristics of sediments were analyzed by measuring particle size distribution, water content, Ignition loss, COD (Chemical Oxyzen Demand), TOC (Total Organic Carbon), TP (Total Phosphorus), SRP (Soluble Reactive Phosphorus) and TN (Total Nitrogen). Particle classification of all three weir sediments showed sandy loam that was caused by the river bed dredging. Due to the presence of weir, Ignition loss, COD, TOC, TP, SRP and TN showed similar trend such as the concentrations of upward weir had higher than those of downward weir. For the case of SRP concentration and C/N ratio, however, there is not much difference in the sediment characteristics compared to the those of sediments before weir construction. Therefore, It can be predicted that there are little effects of weir construction on sediment characteristics. However, weir construction could influence water quality of the river by controlling the transport and the accumulation of suspended materials from rainfall. Therefore, more intensive monitoring is required to examine the magnitude and patterns of sediment accumulation which could influence overlying water quality.

A Study on Complexity Analysis of Extensible Profile Verification Software for Energy Storage System (에너지저장장치용 확장성 프로파일 검증 소프트웨어 복잡도 분석에 관한 연구)

  • Kwon, Hyeokyoung;Ryu, Youngsu;Park, Jaehong;Kwon, Kiwon
    • Journal of Internet Computing and Services
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    • v.17 no.5
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    • pp.59-65
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    • 2016
  • Recently, a study has been progressed about the energy storage system for resolving energy shortage problems in the world. The energy storage system can maximize energy storage system's energy usage by monitoring and controlling about all energy infrastructures on energy network. However, compatibility problems among main components or devices of the energy storage system are obstacles to development of energy storage system products. An extensible profile and extensible profile verification software being able to verify the extensible profile have been required in order to resolve compatibility problems. In this paper, the study on complexity analysis for the extensible profile verification software for the energy storage system is performed. A XML based profile and C language structure based profile are used for analysis of the profile verification software. The complexity of complex verification structure that parses the XML based profile several times and simple verification structure that parses the C language structure based profile are analyzed and compared. Time complexity, space complexity, and cyclomatic complexity are used for complexity analysis. By using these complexity analysis, the study result that compares and analyzes the complexity of XML based and C language structure based profile verification software is presented.