• Title/Summary/Keyword: 기술적 요소

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Evaluation of Regional Adaptability in Introduced Super Sweet Corn Hybrids and Heritability of Agronomic Traits (도입 초당옥수수 교잡종의 지역 적응성 및 농업 형질의 유전력 평가)

  • Lee, Shin-Young;Kang, Jong-won;Wang, Seung-hyun;Park, Tai-choon;Chung, Jong-Wook;So, Yoon-Sup
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.66 no.2
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    • pp.130-137
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    • 2021
  • This study evaluated newly introduced, commercial super sweet corn hybrids (Zea mays L.) for their potential as breeding materials. Agronomic traits were measured and variance components were obtained using a linear mixed model to estimate the heritability. The trials were carried out in 2018 at two locations (Haenam and Oksan in South Korea). All traits had low heritability, except for mid tasseling and silking days. These traits with low heritability mostly had low genetic variance component estimate. In case of ear height ratio, significant genotype by location appeared to be responsible for low genetic variance, which in turn led to low heritability. Low heritability estimates from the trials with commercial hybrids were perhaps because those hybrids were highly improved for commercial success. Hence, this does not necessarily point to them having poor potential as breeding materials. To overcome low heritability, significant genotype by environment interaction, and achieve high selection efficiency, intermating among hybrids is recommended to create new recombinants before inbred line development.

A study on platform-based preliminary design guidelines associated with the behaviour of piles to adjacent tunnelling (터널근접시공에 의한 말뚝의 거동을 고려한 플랫폼 기반의 예비 설계 가이드라인에 대한 연구)

  • Jeon, Young-Jin;Lee, Gyu-Seol;Lee, Jae-Cheol;Batbuyan, Chinzorig;Lee, Cheol-Ju
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.24 no.2
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    • pp.129-151
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    • 2022
  • In the current work, a series of three-dimensional finite element analyses have been carried out to understand the behaviour of piles when the adjacent tunnelling passes underneath grouped piles with a reinforced pile cap. In the current study, the numerical analysis studied the computed results regarding the ground reinforcement condition between the tunnel and pile foundation. In addition, several key issues, such as the pile settlements, the axial pile forces, the shear stresses and the relative displacements have been thoroughly analysed, and the IoT platform based preliminary design guidelines were also presented. The pile head settlements of the nearest pile from the tunnel without the ground reinforcement increased by about 70% compared to the farthest pile from the tunnel with the maximum level of reinforcement. The quality management factor data of the piles were provided as API (Application Programming Interface) of various forms by the collection and refinement. Hence it has been shown that it would be important to provide the appropriate API by defining the each of data flow process when the data were created. The behaviour of the grouped piles with the pile cap, depending on the amount of ground reinforcement, has been extensively analysed, and the IoT platform regarding the quality management of piles has been suggested.

A Study on the Determination of Minimum Welding Condition Based on Structural Strength under Launching for Tandem Blocks (선체 블록 진수 시 필요한 최소 용접 구조 강도 평가에 관한 연구)

  • Myung-Su Yi;Joo-Shin Park
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.28 no.7
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    • pp.1267-1273
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    • 2022
  • Although the Korea shipbuilding industry has recently been receiving most of the orders for ships in the world, production processes are being disrupted due to a shortage of manpower at the production site. This is because the workers quit the shipyard as both work and wages were reduced due to the long slump in the shipbuilding industry. The main reason for the increase in orders was the large-scale orders for Qatar LNG carriers, and the situation in which the technical specifications required for ships are becoming more complex is also working to an advantage. Because the contract delivery time is of utmost importance for ships, the dock launch plan is the most important management item among the shipyard's major processes. The structure to be built in the dock may be a hull that has left the design work or a finished vessel, and in some cases, it is often at the level of some blocks of the hull. When launching, the hull is affected by the hogging or sagging moment due to the fluid force, and securing the safety of the structural strength of the block connection is of utmost importance. In a normal process, the connecting member launches after welding has been completed, but in actual shipbuilders, quick decision-making is needed on the conditions for securing structural safety to comply with the docking schedule. In this study, a detailed analysis method and applicability using a bending stress evaluation method and finite element analysis modelling were analyzed to rationally judge the above-mentioned problems from an engineering point of view. The main contents mentioned in the thesis can be used as good examples when conducting similar structural strength evaluations in the future.

A study on the evaluation area of academic achievement in special education basic curriculum based on importance and performance analysis (중요도·실행도 분석에 근거한 특수교육 기본교육과정 학업성취도 평가 영역 고찰)

  • Shin, Seoyoung;Park, Changun
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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    • v.7 no.9
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    • pp.815-823
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    • 2017
  • The purpose of this study is to investigate the need for practical evaluation of special education field based on the analysis of the importance - performance of special education basic curriculum academic achievement evaluation area. The evaluation categories and areas for the analysis of importance and performance are set in 4 categories - 22 areas of life education derived from Delphi analysis and 7 categories- 27 areas in special education basic curriculum. As a result of analyzing the importance and performance of 126 teachers of intellectual disability special schools in P metropolitan city, statistically significant difference was shown between importance and performance in all areas. As a result of analysis of scatter plot with x - axis and significance as y axis based on averaging point, some elements of subject education showed low recognition level both in importance and execution. The results of this study suggest the necessity of restructuring the evaluation area and the evaluation system of the basic education curriculum of the special education and further revise the contents of the curriculum of the national level basic curriculum and the content area, It implies that discussion is needed.

Development of Metrics to Measure Reusability Quality of AIaaS

  • Eun-Sook Cho
    • Journal of the Korea Society of Computer and Information
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    • v.28 no.12
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    • pp.147-153
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    • 2023
  • As it spreads to all industries of artificial intelligence technology, AIaaS equipped with artificial intelligence services is emerging. In particular, non-IT companies are suffering from the absence of software experts, difficulties in training big data models, and difficulties in collecting and analyzing various types of data. AIaaS makes it easier and more economical for users to build a system by providing various IT resources necessary for artificial intelligence software development as well as functions necessary for artificial intelligence software in the form of a service. Therefore, the supply and demand for such cloud-based AIaaS services will increase rapidly. However, the quality of services provided by AIaaS becomes an important factor in what is required as the supply and demand for AIaaS increases. However, research on a comprehensive and practical quality evaluation metric to measure this is currently insufficient. Therefore, in this paper, we develop and propose a usability, replacement, scalability, and publicity metric, which are the four metrics necessary for measuring reusability, based on implementation, convenience, efficiency, and accessibility, which are characteristics of AIaaS, for reusability evaluation among the service quality measurement factors of AIaaS. The proposed metrics can be used as a tool to predict how much services provided by AIaaS can be reused for potential users in the future.

A Numerical Study on the Agglomeration of Algae by the Ultrasonic Wave (초음파를 이용한 미세조류 응집에 관한 수치해석 연구)

  • Ha, Ji Soo;Shim, Sung Hun;Jung, Sang Hyun
    • Journal of Energy Engineering
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    • v.25 no.1
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    • pp.23-28
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    • 2016
  • In spite of various merit of algae as biofuel, the production cost of algae is a considerable obstacle for commercialization. The concurrent development of essential technologies is needed for the cultivating, harvesting, extracting and energy transformation. The production cost of algae biofuel has still higher than that of the other commercial biofuel. The major research activity has been focused on the cultivating and the research of other processes has been done with relatively lower activity. It is difficult to separate the algae from water because of the similar magnitude of density each other. The agglomeration and extracting of algae with the hybrid technology using ultrasonic wave is rare effect of environmental hazard and also it is appropriate technology for the next generation energy resources. The present research is investigated for the effective separation of algae from water with the ultrasonics wave. The aim of the present research is focused on the establishment of optimal design of algae agglomeration system. For this purpose, the computational fluid dynamic analysis has been conducted in the flow field with ultrasonic wave and algae flow to clarify the mechanism of algae separation by ultrasonic wave.

A Study on The Security Vulnerability Analysis of Open an Automatic Demand Response System (개방형 자동 수요 반응 시스템 보안 취약성 분석에 관한 연구)

  • Chae, Hyeon-Ho;Lee, June-Kyoung;Lee, Kyoung-Hak
    • Journal of Digital Convergence
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    • v.14 no.5
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    • pp.333-339
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    • 2016
  • Technology to optimize and utilize the use and supply of the electric power between consumer and supplier has been on the rise among the smart grid power market network in electric power demand management based on the Internet. Open Automated Demand Response system protocol, which can deliver Demand Response needed in electric power demand management to electricity supplier, system supplier and even the user is openADR 2.0b. This paper used the most credible, cosmopolitanly proliferated EPRI open source and analysed the variety of security vulnerability that developed VEN and VTN system may have. Using the simulator for attacking openADR protocol, the VEN/VTN system that has been implemented as EPRI open source was conducted to attack in a variety of ways. As a result of the analysis, we were able to get the results that the VEN/VTN system has security vulnerabilities to the parameter tampering attacks and service flow falsification attack. In conclusion, if you want to implement the openADR2.0b protocol system in the open or two-way communication environment smart grid network, considering a variety of security vulnerability should be sure to seek security technology and services.

Controlled Production of Monodisperse Polycaprolactone Microparticles using Microfluidic Device (미세유체장치를 이용한 생분해성 Polycarprolactone의 단분산성 미세입자 생성제어)

  • Jeong, Heon-Ho
    • Clean Technology
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    • v.25 no.4
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    • pp.283-288
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    • 2019
  • Monodisperse microparticles has been particularly enabling for various applications in the encapsulation and delivery of pharmaceutical agents. The microfluidic devices are attractive candidates to produce highly uniform droplets that serve as templates to form monodisperse microparticles. The microfluidic devices that have micro-scale channel allow precise control of the balance between surface tension and viscous forces in two-phase flows. One of its essential abilities is to generate highly monodisperse droplets. In this paper, a microfluidic approach for preparing monodisperse polycaprolactone (PCL) microparticles is presented. The microfluidic devices that have a flow-focusing generator are manufactured by soft-lithography using polydimethylsiloxane (PDMS). The crucial factors in the droplet generation are the controllability of size and monodispersity of the microdroplets. For this, the volumetric flow rates of the dispersed phase of oil solution and the continuous phase of water to generate monodisperse droplets are optimized. As a result, the optimal flow condition for droplet dripping region that is able to generate uniform droplet is found. Furthermore, the droplets containing PCL polymer by solvent evaporation after collection of droplet from device is solidified to generate the microparticle. The particle size can be controlled by tuning the flow rate and the size of the microchannel. The monodispersity of the PCL particles is measured by a coefficient of variation (CV) below 5%.

Optimization of Classification of Local, Regional, and Teleseismic Earthquakes in Korean Peninsula Using Filter Bank (주파수 필터대역기술을 활용한 한반도의 근거리 및 원거리 지진 분류 최적화)

  • Lim, DoYoon;Ahn, Jae-Kwang;Lee, Jimin;Lee, Duk Kee
    • Journal of the Korean Geotechnical Society
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    • v.35 no.11
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    • pp.121-129
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    • 2019
  • An Earthquake Early Warning (EEW) system is a technology that alerts people to an incoming earthquake by using P waves that are detected before the arrival of more severe seismic waves. P-wave analysis is therefore an important factor in the production of rapid seismic information as it can be used to quickly estimate the earthquake magnitude and epicenter through the amplitude and predominant period of the observed P-wave. However, when a large-magnitude teleseismic earthquake is observed in a local seismic network, the significantly attenuated P wave phases may be mischaracterized as belonging to a small-magnitude local earthquake in the initial analysis stage. Such a misanalysis may be sent to the public as a false alert, reducing the credibility of the EEW system and potentially causing economic losses for infrastructure and industrial facilities. Therefore, it is necessary to develop methods that reduce misanalysis. In this study, the possibility of seismic misclassifying teleseimic earthquakes as local events was reviewed using the Filter Bank method, which uses the attenuation characteristics of P waves to classify local and outside Korean peninsula (regional and teleseismic) events with filtered waveform depending on frequency and epicenter distance. The data used in our analysis were analyzed for maximum Pv values using 463 events with local magnitudes (2 < ML ≦ 3), 44 (3 < ML ≦ 4), 4 (4 < ML ≦ 5), 3 (ML > 5), and 89 outside Korean peninsula earthquakes recorded by the KMA seismic network. The results show that local and telesesimic earthquakes can be classified more accurately when combination of filtering bands of No. 3 (6-12 Hz) and No. 6 (0.75-1.5 Hz) is applied.

Study on R&D Manpower Requirements for the Field of Pharmaceutical - An Application of Delphi Method (제약산업 R&D 인력수급 전망과 인력수급에 영향을 주는 요인분석 - 델파이 조사 기법 적용)

  • Choi, Han-Joo;Suh, Chang-Jin
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.3
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    • pp.1270-1277
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    • 2011
  • Since the pharmaceutical industry is a research oriented sector, the research and development capability based on the qualified R&D manpower is one of the key success factors to strengthen the national competitiveness. Securing the appropriate number of researcher needed for the research activities in these fields is an important precondition for a government policy that aims for a strongly knowledge-intensive the pharmaceutical industry growth. In this study, we conducted and analyzed a delphi survey of the experts(the principal investigators) with expertise in these pharmaceutical research areas. The current and future requirements for the pharmaceutical science research personnel including medical doctors have been evaluated, extending the year 2017. The results of this study can be summarized as follows; First, in 2007 the field of pharmaceutical R&D personnel is currently under-supplied as many as about 5,600 people. The rate of under-supplied is about 18.1%. Second, in 2017 the evaluation shows that the R&D personnel in this field will be more severely under-supplied as many as 13,500 people. The rate of under-supplied will be about 28.6%. As a result, the confrontation of demand and supply evaluation shows that, in general, severe shortages of R&D manpower in the field of pharmaceutical will result if there are not adequate manpower policy adjustment.