• Journal of Ginseng Research
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• 제26권1호
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• pp.10-16
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• 2002

In replicated field trials, the efficacy of pentachloronitrobenzene (PCNB; quintozene) for control of damping-off of ginseng seedlings was found to be affected by timing of application and formulation. Application at the time of seeding and prior to placement of straw mulch was found to provide the moat consistent level of disease control. However, decline in plant stand during the four-year production cycle resulted in most treatments providing similar levels of plant populations at harvest. Soil residues of pentachloronitrobenzene were generally highest (1 $\mu\textrm{g}$ PCNB/g soil) in those treatments that exhibited the highest levels of disease control in the seedling year. Straw contained high levels of quintozene after application. Beet seed assays with artificially-infested soils indicated that current use rates provide an amount of product suitable for high levels of disease control.

• 산업기술연구
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• 제27권B호
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• pp.209-214
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• 2007

This paper is the research result about centrifuge model experiments of investigating the behavior of bridge abutment on the sloped ground. Ground condition of the studied site was the bridge abutment with pile foundation adjacent to the slope. The pile foundations was supported on the soft rocks covered with the embankment. Evaluating the behavior of such a complicate ground and structure conditions was not easy so that the centrifuge modelling was performed to find the overall behavior of them. Layout of centrifuge model experiment was simplified to simulate easily the actual behavior of very complicate site condition. Construction process in field such as ground excavation for footing foundation, installation of piles, placement of footing and bridge abutment, backfilling and surcharge loading eas duplicated in the centrifuge model experiment. Consequently, the stability of the piled bridge abutment adjacent to the slope of embankment was evaluated throughout centrifuge modelling.

• Computers and Concrete
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• 제4권1호
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• pp.33-47
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• 2007

Slipforming is a construction method in which the forms move continuously during concrete placement. This paper presents a numerical procedure based on the finite element method to simulate the thermal behavior of concrete during slipforming operations. The validity of the model was successfully tested by simulating a very complex but well documented field case of actual slipforming operations performed during the construction of an offshore concrete oil platform structure. The results obtained have been related to the shape of the concrete "hardened front" in the forms, which allows quick evaluation of the operation. The results of the numerical investigation have shown that the shape of the "hardened front" can be affected by the temperature of the fresh concrete and ambient conditions. For a given initial concrete temperature, there are limitations for the ambient temperature that, when exceeded, can create an unfavorable shape of the concrete "hardened front" in the forms. Similarly, for a given ambient temperature, the initial concrete temperature should not be fall below an established limit in order to avoid unfavorable shape of the "hardened front".

• 한국소음진동공학회논문집
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• 제12권12호
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• pp.950-955
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• 2002

The coupled finite/boundary element method is used in numerical analysis for acoustic radiation from the vibration of rectangular composite plate which is simply supported. This analysis is validated using the Wallace equation for an isotropic plate. Active control of sound fields has been tarried out using 3 pairs of piezoelectric sensor/actuator and a pair of viscoelastic material by Passive constrained layer damping treatment. The results show that the optimal placement of piezoelectric sensor/actuator and VE patch is required to control the sound fields from a vibrating composite plate.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 추계학술대회 논문집
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• pp.259-266
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• 1999

A study on the static type train simulator will include the training of new drives requires that the environment of the cab, controls placement, etc. must highly realistic so that driver can readily transfer his training experience to the real world. The simulator computer sends video disc speed command to a Video PC processor. A video switcher select the output of the on-line player. This selection is done with loss of vertical synchronization, meaning the picture will not noticeable roll or jump as the simulation mover from disc to disc. The video image quality remain contestant through the simulated speed range from zero to 100km/h. Flicker is avoided in the scene by the use of a TBC(Time Base Corrector) which causes the display of one video field at a time. Thus, no interfield jitter is present when the scene is stopped.

• Nuclear Engineering and Technology
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• 제53권10호
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• pp.3314-3318
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• 2021

This paper presents a mode-matching analysis of the electromagnetic coupling between open cable trays in an indoor structure when an electric-line current is generated as an electromagnetic source. We validated the mode-matching method by comparing the mode-matching results with those computed from a commercial electromagnetic simulator and then investigated the strength of the electric-field coupled in a victim cable tray while varying the distances between cable trays and architectural surfaces. The results of this study provide geometrical information on the placement of open cable trays to avoid electromagnetic interference problems.

• 가정간호학회지
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• 제25권3호
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• pp.240-248
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• 2018

Purpose: The purpose of this study was to evaluate the validity of an educational program developed for geriatric visiting nurses in Seoul by assessing their satisfaction level and level of learning goal achievement. Methods: This descriptive research study was conducted to develop, implement, and evaluate the educational program in accordance with the ADDIE Instructional System Model. Participants were 170 nurses hired for the 2016 Seoul Metropolitan Government visiting service for older people. Based on Kirkpatrick's Training Evaluation Model, reaction and learning evaluations were conducted during and after the educational program. Data were analyzed using descriptive statistics. Results: The developed educational program consisted of basic and professional courses. The evaluations showed that participants were highly satisfied with the lectures and field placement. Over 90% of the participants achieved the learning achievement goals. Conclusion: The program developed for geriatric visiting nurses in Seoul is considered a valid educational program because of the participants' high levels of satisfaction and academic achievement.

• 대한치과의료관리학회지
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• 제8권1호
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• pp.24-29
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• 2020

With the advancement of information technology, the application of augmented reality (AR) in dentistry is an emerging research field of image-guided surgery and dental education. In addition, the digital approach to incorporating AR in dental practice management is considered to be feasible. A prototype is developed to apply AR to dental daily clinical practice in order to help dentists to access electronic dental records. This prototype delivers patients' information and related clinical data to dental clinicians directly without the need to search for the appropriate patients. Wearable AR devices are considered to be a convenient tool for practicing dentists because dental practitioners are not always able to use a computer during active clinical sessions, such as implant placement, root canal treatment, and patient-doctor communication. The use of AR to visualize passive transferred patient data would be valuable for practicing dentists.

• 한국도서관정보학회지
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• 제50권3호
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• pp.239-259
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• 2019

본 연구 목적은 학교도서관진흥법시행령 개정 이후 사서교사 배치 양상을 고찰하여 개선 방안을 도출하는 데 있다. 이를 위해 사서교사 배치에 대한 법규, 정책, 현황을 분석했다. 교육부는 제3차 학교도서관진흥기본계획에서 2030년까지 학교도서관 수 대비 사서교사 배치율을 50% 수준으로 확보한다는 목표를 밝혔다. 이에 신규 사서교사 수요를 추산한 결과, 매년 323명의 신규 사서교사 수요를 예측할 수 있었다. 경기도 등은 정원외 기간제 사서교사 800여 명을 전면 배치하여 학교도서관 전담인력 배치 노력을 기울이고 있다. 하지만 질문지를 통해 2019년 기간제 사서교사 채용자를 대상으로 소지 교사 자격을 조사한 결과, 사서교사 자격증 소지자는 설문 참여 인원 122명 중 69명으로 56.6%에 그쳤다. 한편, 사서교사 양성 현황 분석 결과, 2019년 한 해 사서교사 자격증을 신규로 취득한 인원은 146명에 불과한 것으로 나타났다. 사서교사 자격증 소지자에 대한 현장 수요는 폭증하는 데 비해, 사서교사 양성 여건이 마련되어 있지 않다는 점을 알 수 있었다. 이에 사서교사 양성 중 장기 계획 수립, 교육대학원 증설 등 사서교사 배치 개선 방안을 제언하였다.

• Nuclear Engineering and Technology
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• 제11권1호
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• pp.47-54
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• 1979

수도(水稻)에 의한 $^{65}$ Zn 표지 및 비표지 아연비료의 잔류(殘留) 효과의 포장실험 결과를 요약하면 다음과 같다. 수량면에서 본 아연비료의 잔효(殘效)는 약간 있었다. 수량에 미치는 아연시비법(施肥法)의 영향을 보면 아연 건층시비가 포층시비 보다 효과가 컸다. 아연 시비 수준별로 본 수량은 5kg Zn/ha 전층 시비가 10, 20kg Zn/ha 건층시비 보다 좋았다. 아연비료 형태별로 수량을 비교해 보면 $^{65}$ ZnSO$_4$ 가 Urea-$^{65}$ Zn 복합비료 보다 좋았다. 이와 같은 경향은 1차년도 실험 결과와 같았다. 수도체(水稻體)의 아연 전 흡수량은 유기물 첨가토양(처리 2와 8)과 Urea-$^{65}$ Zn 복합비료 시용구에서는 전년도 보다 현저하게 증가되었다. 수도체의 % Zndff값은 전년도에 얻어진 값 보다 훨씬 감소되었다. 수도체의 비료 아연 흡수량은 대부분의 아연 처리구에서 전년도 보다는 약간 감소되었으나 유기물 시용토양에 아연을 전층시비했을 때와 Urea-$^{65}$ Zn 복합비료 시용구에서는 전년도의 값 보다는 오히려 증가되었다. 아연 전층시비법은 표층시비법 보다 수도체의 비료 아연 흡수량은 많았다. 수도체의 전아연 흡수량에 대해서 비료에 유래된 아연의 기여율은 4.6%-24.3% 범위하였다. 5kg Zn/ha 수준에서 $^{65}$ Zn 표지 아연 비료의 이용 효율은 0.213%-0.58%였다.