• Title/Summary/Keyword: Pilot point

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Subsurface Characterization using the Simultaneous Search based Pilot Point Method (SSBM) in Various Data Applications (지하수 흐름특성 분석을 위한 동시 검색기반 파일럿 포인트 방법 적용 - 다양한 데이터 활용 기반)

  • Jung, Yong
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.39 no.5
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    • pp.579-586
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    • 2019
  • Pilot Point Method (PPM) is one of the popular methods to search hydraulic conductivities in the inverse method using groundwater flow equations. In this study, the Simultaneous Search based Pilot Point Method (SSBM) was applied with diverse information (e.g. hydraulic heads and/or tracer concentration) applications over previously developed sensitivity based Pilot Point Method (e.g. D-optimality based Pilot Point Method: DBM). In the case of DBM, due to the minimized the variance size, tracer concentration can be recognized as a tool to control the searching space of hydraulic conductivities. SSBM reduced the procedure of hydraulic conductivity searching, though it produced more variance for exploring hydraulic conductivities. In addition, SSBM was dependent on the initial hydraulic conductivity values for search finalized hydraulic conductivities. When tracer concentration was applied, searching hydraulic conductivities was more preferable than only when hydraulic head was applied. Applications of various data for searching hydraulic conductivities is recommended as a more efficient way.

Applications of Diverse Data Combinations in Subsurface Characterization using D-optimality Based Pilot Point Methods (DBM)

  • Jung, Yong;Mahinthakumar, G.
    • Journal of Soil and Groundwater Environment
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    • v.18 no.2
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    • pp.45-53
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    • 2013
  • Many cases of strategically designed groundwater remediation have lack of information of hydraulic conductivity or permeability, which can render remediation methods inefficient. Many studies have been carried out to minimize this shortcoming by determining detailed hydraulic information either through direct or indirect measurements. One popular method for hydraulic characterization is the pilot point method (PPM), where the hydraulic property is estimated at a small number of strategically selected points using secondary measurements such as hydraulic head or tracer concentration. This paper adopted a D-optimality based pilot point method (DBM) developed previously for hydraulic head measurements and extended it to include both hydraulic head and tracer measurements. Based on different combinations of trials, our analysis showed that DBM performs well when hydraulic head is used for pilot point selection and both hydraulic head and tracer measurements are used for determining the conductivity values.

A Study on Pilot Fatigue Relating to Safety Operations (조종사의 피로와 안전운항에 대한 고찰)

  • Park, Y.S.
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.13 no.2
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    • pp.63-71
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    • 2005
  • There is a concern in the aviation community that pilot schedules can lead to fatigue and increased chance of an aviation accident. Yet despite this concern, there is little empirical studies showing the relationship between pilot fatigue and commercial aviation accidents. At this point of view, countering fatigue is a challenging proposition in complex aviation operations. However, with appropriate planning, many strategies can contribute to pilot alertness and flight safety. With proper education program, sustaining a physiological fit, a right knowledge about pilot fatigue can design a safety operations. On this study, I inquire into the ways of enhancing pilot's efficiency from fatigue.

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A Pilot Test on Stop-Smoking and Development of HBN-001 (금연이침저주파지극기(HBN-001)의 개발 및 금연효과 Pilot Test)

  • Cha, Yun-Yeop;Lee, Gui-Sun;Park, Roh-Gook
    • Asia-Pacific Journal of Business Venturing and Entrepreneurship
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    • v.7 no.3
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    • pp.161-166
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    • 2012
  • With recent increase in interest on health through extension of life expectancies of people, desire of smokers to stop smoking is also getting stronger. Korean medicine uses Auricular Acupuncturing as a treatment to stop smoking. This Study examined whether Auricular Acupuncturing is actually effective by manufacturing device that can stimulate lung point and endocrine point that are known to be effective in stop smoking through low frequency stimulation. Firstly, Low Frequency Stimulator for Auricular Acupuncturing to quit smoking (HBN-001) was developed as an experimental device by combining low frequency stimulation to auricular acupuncture points and headset, and was pilot tested on 20 subjects. The average quantity of cigarette smoked prior to the application of the procedure was 12.19, which was reduced to 10.34 cigarettes after 2 weeks with more than 5 sessions of Auricular Acupuncturing. However, there was no statistically significant difference. The changes in the desire to smoke following the procedure included 4 subjects (20%) with no change, 4 (20%) with slight reduction, 4 (20%) with 25%~49% reduction, 6 (30%) with 50%~75% reduction, 1 (5%) with 75%~99% reduction and 1 (5%) with complete elimination of desire to smoke. Changes in how cigarette smoking tasted included 2 subjects (10%) with slight improvement, 7 (35%) with no change, 6 (30%) with slight worsening and 5 (25%) with substantially worsened taste. Based on the results of the Pilot Test, it appears that Auricular Acupuncturing could be affirmatively helpful in quitting smoking, and further researches in greater depth would be necessary in the future.

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Survey on the Satisfaction and Demand of Healthcare Providers who Participated in a Collaborative First-stage Pilot Project between Korean Medicine and Western Medicine (의·한의 협진 1단계 시범 사업 참여 의료인 대상 만족도 및 요구도 조사)

  • Lee, Hye Yoon;Lee, Dong Hyo;Lee, Go Eun;Kim, Jeong Hun;Kim, Hyun Min;Kim, Nam Kwen
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.32 no.2
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    • pp.134-140
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    • 2018
  • This study aims to evaluate healthcare providers' satisfaction and demands pertaining to the collaborative first-stage pilot project between Korean medicine and Western medicine. This survey was conducted via electronic mail among 33 healthcare providers participating in the pilot project. Likert type 5-point scale or Likert type 7-point scale was used to evaluate each item. The response of '${\geq}4$' on the 5-point scale, and '${\geq}5$' on the 7-point scale were analyzed as positive answers. A total of 27 healthcare providers (81.8%) responded, of which 9 were western medical doctors (33.3%) and 18 were Korean medical doctors (66.7%). In respect to satisfaction of the pilot project, 88.9% gave positive responses on improved patients' convenience, 59.3% on treatment efficiency and 55.6% on diagnosis efficiency. In terms of self-evaluation on the pilot project, 70.4% gave positive answers on changes in quality of collaborative treatment, 74.1% on cooperation of results, 63.0% on cooperation of structure and 51.9% on cooperation of process. In terms of demand for collaborative treatment or the pilot project, 'standardized manual' and 'simplification of administrative procedures' showed highest demand, resulting up to 88.9%, followed by 85.2% demanding more public relations and 63.9% demanding enlargement of participating hospitals. This survey revealed that healthcare providers are generally satisfied with patients' convenience and treatment effects. Further studies are needed to develop a standardized manual, simplified administrative procedures, and expanded pilot project contents.

Aquifer Transmissivity Estimation with Kriging Techniques and Numerical Model in the LAN (Kriging기법과 수치모형에 의한 이안지구 대수층의 투수량계수 추정)

  • 조웅현;박영기;김환홍
    • Journal of the Korean Society of Groundwater Environment
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    • v.1 no.2
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    • pp.113-120
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    • 1994
  • One of the delicate problems in aquifer management is the identification of the spatial distribution of tile hydrological parameters. The observed data are insufficient to identify the distribution of transmissivities in LAN aquifer. To determine the distribution of the transmissivity in LAN aquifer, it would be required to transform the observed heads at the pilot points into transmissivities. Therefore, three procedures wire tackled for the identification of the spatial distribution of the hydrological parameters; geostatistical estimate of the parameter field on the basis of known well point, heads reconstructed by a numerical model, and modification of the values at pilot points by a minimization algorithm. The variogram of Kriging has been applied to a total of 258 transmissivity value in attempt to quantify their distribution of LAN aquifer. Variogram of the observed and optimized transmissivities at pilot points are adapted to the exponential form. So, it is fitted by theoretical one with coefficients of w=0.623, a=2.743. Values of head obtained through numerical analysis are adjusted to the observed values so that heads have been transformed completely into the transmissivities at the observation wells. The procedure represented contour map of the estimated transmissivities and the calculated head.

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Design of a Photo Energy Harvesting Circuit Using On-chip Diodes (온칩 다이오드를 이용한 빛에너지 하베스팅 회로 설계)

  • Yoon, Eun-Jung;Hwang, In-Ho;Park, Jun-Ho;Park, Jong-Tae;Yu, Chong-Gun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.16 no.3
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    • pp.549-557
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    • 2012
  • In this paper an on-chip photo energy harvesting system with MPPT(Maximum Power Point Tracking) control is proposed. The ISC(Integrated Solar Cell) is implemented using p-diff/n-well diodes available in CMOS processes. MPPT control is implemented using the linear relationship between the open-circuit voltage of a PV(Photovoltaic) cell and its MPP(Maximum Power Point) voltage such that a small pilot PV cell can track the MPP of a main PV cell in real time. Simulation results show that the designed circuit with the MPPT control delivers the MPP voltage to load even though the load is heavy such that the load circuit can operate properly. The proposed circuit is designed in 0.18um CMOS process. The designed main PV cell and pilot PV cell occupy $8mm^2$ and $0.4mm^2$ respectively.

Certification on cockpit evaluation for small airplane (소형비행기 조종실 평가에 대한 인증방법 연구)

  • Kim, Phil-Soo;Jeong, Bong-Gu
    • Journal of Aerospace System Engineering
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    • v.6 no.2
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    • pp.1-6
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    • 2012
  • On this study, as a Human Factor(HF)'s point of view, typical PVI(Pilot Vehicle Interface) evaluation for small airplane cockpit design, PVI evaluation items and procedures to show compliance to KAS Part 23 "Airworthiness Standards : Normal, Utility, Acrobatic, And Commuter Category Airplanes" are introduced and reviewed. This study is based on the experience of Korean small civil airplane development and certification program.

Parameter Identification of an unconfined Aquifer (피압 대수층의 전달경수 동정)

  • Lee, Jae-Hyeong;Park, Yeong-Gi;Hwang, Man-Ha
    • Water for future
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    • v.17 no.4
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    • pp.303-310
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    • 1984
  • One of the delicate problems in aquifer problems in aquifer management is the identification of the spatial distribution of the hydrological parameters. To determine the distribution of the transmissivity in a aquifer, several data are available; the local values of transmissivity around well, interference tests, some knowledge of geological structure. All this information has to be combined to find a plausible representation of the aquifer. According to a three phased optimization process calculation is carried out; geostatistical estimate of the parameter field on the basis of known well point values adjustable on a limited numerical model, and modification of the values ot pilot points by a minimization algorithm. This procedure, applied to a known case, has proved to be very useful.

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Development of Questionnaire Items of Personality Test for the Pilot Aptitude (조종적성인성검사 문항개발 연구)

  • Park, Seikwon;Lee, Seungwon;Yoon, Youkyung
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.24 no.4
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    • pp.62-69
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    • 2016
  • The purpose of this study is to develop questionnaire items for the Pilot Aptitude Personality Test(PAPT) which can predict the flight training achievement through personality and personal characteristics. To do this, we investigated the personality traits required to successfully conduct flight training for 30 flight instructors as a subject. The results were as follows: motivation, concentration, concentration, situational awareness, and concentration. Based on this, preliminary 300-item questionnaire was prepared by combining the existing studies related to pilot aptitude. Survey was conducted using preliminary questionnaire for 152 student pilots as a subject. As a result of the correlation analysis between the results of the questionnaire and the flight training, 16 questions were derived. Finally, factor analysis showed that the final 14 questionnaire items were confirmed. The internal concept of an item is categorized as personality, perception, and motivation. This study suggests that the pilot aptitude should be viewed from an extended point of view by analyzing individual characteristics and pilot aptitude in relation to flight training achievement.