• 제목/요약/키워드: life testing

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농업용 멀티콥터를 활용한 무인항공기용 작물보호제 살포양상에 대한 상용노즐별 차이 (Comparison of Each Commercial Nozzle on the Application Pattern of Pesticide for Unmanned Aerial Vehicles (UAV))

  • 박부용;정인홍;김선우;김길하
    • 한국응용곤충학회지
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    • 제60권2호
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    • pp.229-234
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    • 2021
  • 본 연구에서는 멀티콥터를 이용한 무인항공용 방제약제 살포시 사용하는 상용 노즐에 3가지 타입에 따른 살포양상과 피복도를 조사하였다. 처리구에 플루페녹수론·메타플루미존(flufenoxuron+metaflumizone) 액상수화제와 비펜트린(bifenthrin) 유제를 살포하고난 뒤, 살포 약제의 낙하입자를 감수지를 이용하여 측정하고 감수지의 피복도를 조사하였다. 낙하입자 분석결과 풍속의 차이에 따라 노즐별 낙하입자 균일도에 차이를 보였으며 제형별 차이는 없었다. 노즐별 분사량은 공식 제공정보와 실제 분사량에 차이를 보였다. 이 결과들은 무인항공기 이용 농업현장방제 및 약제등록시험 가이드라인 설정에 근거자료로 활용될 수 있을 것이다.

Tomosynthesis Feasibility Study for Visualization of Interiors of Wood Columns Surrounded with Walls

  • LEE, Jun Jae;KIM, Chul-Ki
    • Journal of the Korean Wood Science and Technology
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    • 제50권4호
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    • pp.246-255
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    • 2022
  • The need for non-destructive testing and evaluation of Korean traditional wooden buildings is increasing because of their widespread deterioration. Among all types of deterioration, termite damage in wooden columns is the most difficult to detect with the naked eye because it starts inside the wood, and the initial deterioration is small. X-ray computed tomography (CT) is the best technology to investigate the inner state of wood that has less damage, but applying it to wooden columns between walls is challenging. Therefore, the feasibility of tomosynthesis, which is a method to reconstruct a coronal section of a subject with a few X-ray projections from a limited angle of rotation, was studied as an alternative to CT. Pine (P. densiflora) with three artificial holes was prepared as a specimen to evaluate the quality of reconstructed tomosynthesis images according to the different number of projections. The quality of the tomosynthesis images in the in-focus plane was evaluated using the contrast-to-noise ratios, while a vertical resolution between the images was assessed by determining the artificial spread function. The quality of the tomosynthesis image in the in-focus plane increased as the number of projections increased and then remained constant as the number of projections reached 21 or over. In the case of vertical resolution, there was no significant difference when 21 projections or more were used to reconstruct the images. A distinct difference between coronal section images was found when the distance was more than 10 mm from one plane to another plane.

한국 의사들의 우울과 이에 영향을 미치는 요인 분석 (Factors Affecting Depression of Korean Physicians)

  • 이서은;신예주;김형준;이미연;정슬아;신동원;조성준
    • 생물정신의학
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    • 제29권2호
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    • pp.40-45
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    • 2022
  • Objectives This study aims to assess the status quo of depression among Korean physicians and identify stressors and psychiatric assets related to it. Methods The questionnaire was designed to assess depression, stressors, burnout and psychiatric assets. 343 physicians were included in the analyses. Results Physician depression in Korea was found to be related to several daily life stressors and occupational stressors. It was also related to higher burnout and lower psychological assets. Physicians who reported workplace problems, familial problems, and mannerism were at higher risk of depression while who reported passion (in psychiatric assets) were at lower risk of depression. Conclusions This study identified factors affecting physician depression in Korea. Further research would benefit physicians and their patients by identifying and testing various, including personal and organizational, intervention methods.

우리나라 고령층의 경제활동 수준 예측 - 머신러닝 기법과 연계한 예측조합법을 중심으로 - (Prediction on the Economic Activity Level of the Elderly in South Korea - Focusing on Machine Learning Method Combined with Forecast Combination -)

  • 김정우
    • 한국융합학회논문지
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    • 제13권5호
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    • pp.237-247
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    • 2022
  • 본 연구는 급속한 고령화 시대에서 우리나라의 고령층의 경제활동 수준을 다양한 머신러닝 기법으로 정확히 예측하고자 하였다. 고령층의 경제활동 수준과 기존 연구들은 고령층의 삶의 만족도, 사회보장제도 등과 연관된 인과성 검증을 중심으로 이루어진 데 반해, 본 연구는 다양한 머신러닝 기법으로 고령층의 경제활동 수준을 예측하였으며, 특히 예측조합법을 함께 사용함으로써 예측의 안정성을 도모하였다. 60세 이상의 경제활동참가율, 취업률 등을 종속변수로 하고 가구 특성, 소득, 평균임금 등을 설명변수로 설정하여 서로 다른 특성을 지닌 5가지의 머신러닝 기법과 2가지의 예측조합법을 적용하여 예측결과들을 비교하였다. 분석 결과, 종속변수별, 예측구간별로 예측성능이 높은 머신러닝 기법 및 예측조합법은 상이하였으나, 예측의 안정성 측면에서는 예측조합법이 상대적으로 우수한 것으로 나타났다. 이에 따라, 본 연구는 고령층의 경제활동 수준을 정확히 예측하고 예측의 안정성을 도모하여 정책적 관점에서도 실용성을 제고한다고 볼 수 있다.

Clinical Application of a Newly Developed Basket Device for Interventional Heartworm Extraction in Three Dogs

  • Lee, Yooyoung;Kim, Hyesung;Yoon, Kwangyong;Park, Jihyeon;Oh, Younna;Oh, Miju;Ban, Jiyoung;Lee, Minju;Kim, Hakhyun;Kang, Byeong-Teck;Chang, Dongwoo
    • 한국임상수의학회지
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    • 제39권4호
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    • pp.177-184
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    • 2022
  • Caval syndrome is a severe complication of canine heartworm disease in which affected dogs present with various clinical signs that are often life-threatening. In cases of severe infection, adulticidal treatment has numerous complications as a result of a marked immune response against dead worms. Therefore, several surgical and non-surgical methods, including interventional extraction, have been applied in veterinary medicine. Despite the usefulness and efficiency of conventional retrieval devices, a few associated limitations must be addressed to reduce their risks and increase their applicability. Herein, we introduced a case of treating three dogs with caval syndrome by applying a newly developed heartworm basket device. The dogs were diagnosed with heartworm disease by heartworm antigen testing and direct smear. Imaging findings revealed remarkable remodeling of the right heart and pulmonary vessels and the presence of heartworms in the right heart. Additionally, heartworms were confirmed in the distal part of the abdominal aorta and femoral arteries in one dog, indicating aberrant systemic migration of the worms. Under general anesthesia, the heartworm basket device was introduced into the right heart via femoral venotomy and arteriotomy in one dog and jugular venotomy in the other two dogs. Although the number of cases in this study was small, the basket device was successful in gradual and cautious extraction of the heartworms in all three dogs. They exhibited good prognosis of clinical symptoms as indicated by imaging analyses.

Effect of therapeutic radioiodine activity on ablation response in differentiated thyroid cancer patients with cut-off serum thyroglobulin levels after 2 weeks of thyroid hormone withdrawal: a retrospective study

  • Ji Young Lee;Hee-Sung Song;Young Hwan Kim
    • Journal of Medicine and Life Science
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    • 제19권3호
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    • pp.95-102
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    • 2022
  • This retrospective study aimed to investigate whether there was a difference in the success rate of removal of residual thyroid tissue in patients with the same cutoff serum thyroglobulin (Tg) value-measured 2 weeks after thyroid hormone withdrawal (THW)-for different radioactive iodine (RAI) activities. We identified 132 patients with papillary thyroid cancer who were treated with total thyroidectomy and RAI therapy to evaluate the efficacy of three radioactivities of I-131: 1,110, 3,700, and 5,550 MBq. Serum Tg testing was performed 1 week before RAI treatment and 2 weeks after THW (pre-Tg); the cutoff pre-Tg level was below 10 ng/mL. Stimulated Tg levels were measured on the day of I-131 administration (off-Tg). After 6 months of treatment, we compared the groups for complete ablation, defined as no uptake on a diagnostic I-131 scan, stimulated Tg level of <1.0 ng/mL, and Tg antibody level of <100 ng/mL. Ninety-five patients (72.0%) achieved complete ablation, with 57.1% (8/14), 78.2% (68/87), and 61.3% (19/31) in the 1,110 MBq, 3,700 MBq, and 5,550 MBq groups, respectively. There was no significant difference in the complete ablation rates between the three groups. In the multivariate analysis, the off-Tg level was a significant predictor of complete ablation. RAI therapy with low radioactivity (1,110 MBq) seemed sufficient for ablation in patients with papillary thyroid cancer with a pre-Tg level below 10 ng/mL. The off-Tg level is a promising and useful predictor of complete ablation after initial RAI therapy.

형상모수에 근거한 소프트웨어 최적방출시기에 관한 비교 연구 (The Comparative Study of Software Optimal Release Time for the Distribution Based on Shape parameter)

  • 신현철;김희철
    • 한국컴퓨터정보학회논문지
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    • 제14권8호
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    • pp.1-9
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    • 2009
  • 본 연구에서는 소프트웨어 제품을 개발하여 테스팅을 거친 후 사용자에게 인도하는 시기를 결정하는 방출문제에 대하여 연구되었다. 소프트웨어의 결함을 제거하거나 수정 작업 중에도 새로운 결함이 발생될 가능성이 있는 무한고장수를 가진 비동질적인 포아송 과정에 기초하고 수명분포는 단위당 고장발생률이 증가하거나 감소하는 속성을 가진 형상모수가 2인 확률 분포를 이용한 최적 방출시기에 관한 문제를 제시하여 소프트웨어 요구 신뢰도를 만족시키고 소프트웨어 개발 및 유지 총비용을 최소화 시키는 최적 소프트웨어 방출 정책에 대하여 논의 되었다. 본 논문의 수치적인 예에서는 고장 간격 시간 자료를 적용하고 모수추정 방법은 최우추정법과 추세분석을 통하여 자료의 효율성을 입증한 후 최적 방출시기를 추정하였다.

적정기술을 위한 종이기반 현장 진단 기술 (Paper Based Point-of-Care Diagnosis for Appropriate Technology)

  • 신관우;권오선
    • 적정기술학회지
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    • 제5권1호
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    • pp.46-53
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    • 2019
  • 적정기술이 현장에서 널리 활용되기 위한 조건 중의 하나는 그 기술을 적용하기 위한 용이함과 경제성이 뒷받침 되어야 한다. 특히 질병의 진단은 전문 인력, 장비, 그리고 시약 등의 비용이 높아, 다른 분야에 비하여 개발도상국에 적용되기 가장 어려운 분야이다. 최근, 주변에 가장 흔한 소재 중의 하나인 종이를 기반으로, 특수한 시설이나 장비가 필요 없이도, 누구나 쉽게 배워서 제작하고, 사용할 수 있는 종이 진단칩 기술이 속속 개발되고 있다. 본 기술들은 특정 질병의 진단에 현장에서 신속하게 제작이 가능한 기술로 활용 가능한 현장진단 칩으로 연구되고 있으며, 그 활용 가능성이 커지고 있다. 이 기술들의 완성도가 높아지면, 개발도상국의 가장 큰 의료문제들을 해결하여, 궁극적으로 인간의 삶의 질을 향상시키는데 활용 될 수 있을 것이다.

2차원 관로형 지하시설물 정보 품질검증기술 개발 (Development of 2D Data Quality Validation Techniques for Pipe-type Underground Facilities)

  • 배상근;김상민;유은진;임거배;정다운
    • 산업경영시스템학회지
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    • 제46권3호
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    • pp.285-292
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    • 2023
  • As various accidents have occurred in underground spaces, we aim to improve the quality validation standards and methods as specified in the Regulations on Producing Integrated Map of Underground Spaces devised by the Ministry of Land, Infrastructure and Transport of the Republic of Korea for a high-quality integrated map of underground spaces. Specifically, we propose measures to improve the quality assurance of pipeline-type underground facilities, the so-called life lines given their importance for citizens' daily activities and their highest risk of accident among the 16 types of underground facilities. After implementing quality validation software based on the developed quality validation standards, the adequacy of the validation standards was demonstrated by testing using data from two-dimensional water supply facilities in some areas of Busan, Korea. This paper has great significance in that it has laid the foundation for reducing the time and manpower required for data quality inspection and improving data quality reliability by improving current quality validation standards and developing technologies that can automatically extract errors through software.

적응적 게임활용 척도 개발 및 타당화 (Development and Validation of Adaptive Game Use Scale (AGUS))

  • 최훈석;김교헌 ;용정순 ;김금미
    • 한국심리학회지 : 문화 및 사회문제
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    • 제15권4호
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    • pp.565-589
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    • 2009
  • 본 연구에서는 게임 사용의 부정적 결과에 초점을 둔 선행 연구와 달리, 게임활용의 긍정적 결과로서의 적응적 게임활용도를 측정하는 도구를 개발하고 타당화하였다. 예비조사를 통해 적응적 게임활용 측정 도구를 개발하고, 유층표집을 통해 선정된 전국 중고등학생 600명을 대상으로 본조사를 실시하였다. 연구결과 활력 경험, 생활경험 확장, 여가 선용, 몰입 경험, 자긍심 경험, 통제력 경험, 사회적 지지망 유지 및 확장 등 7개의 요인으로 구성되는 척도의 신뢰도와 시간에 걸친 안정성이 확인되었다. 또한, 척도의 구성타당도, 변별타당도, 및 공인타당도를 확인하였다. 게임 연구의 외연 확장과 관련한 본 연구의 시사점과 장래 연구 방향을 논의하였다.

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