• 스마트미디어저널
• /
• 제1권1호
• /
• pp.42-47
• /
• 2012

IT 기술의 발전은, 우리사회의 다양한 산업 분야에 적용 되어 우리의 삶을 보다 효율적이고 생산적으로 바꾸고 있다. 농업IT는 이러한 IT기술을 농업에 적용하여 작물의 생산량과 품질을 향상시키며, 소비자로 하여금 믿을 수 있는 생산, 유통 정보를 제공하는 기술이다. 오늘날 RFID/USN의 등장은 농산물과 연관된 생장, 환경 정보의 수집을 가능하게 하고 각종 환경센서 등을 통해 수집된 디지털 정보는 누적, 분석 등을 통해 이상기후 예측, 병해충 예찰, 작물의 생산성 향상 및 균일 생산 보장 등을 위해 활용될 수 있을 것으로 기대된다. 본 연구에서는 이러한 RFID/USN 기술을 기반으로 저전력 센서네트워크와 미들웨어, 생장관리 플랫폼을 통해 모바일 환경에서 재배 환경 정보의 지속적 모니터링 및 각종 생장 데이터의 수집 및 전송, 각종 작업정보의 교환이 가능하게 함으로써 재배자에게 보다 효율적으로 생장환경을 관리할 수 있는 시스템을 제안한다.

• 한국소음진동공학회:학술대회논문집
• /
• 한국소음진동공학회 2014년도 추계학술대회 논문집
• /
• pp.960-965
• /
• 2014

Transmission loss of specimen is calculated by measuring energy of incident and transmission and using reverberant room of large size. But normal measurement of transmission loss has trouble because it is actually demanded that large area and specimen of certain size is satisfied with condition of diffused sound field. Especially, in case of mechanical component, interested frequency band is mid-frequency band between 500 ~ 2k Hz, and it is used to be available to minimize a reverberation chamber under conditions satisfying acoustic one because production of specimen for transmission loss measurement has limit. But, as in semi-reverberation room, it is difficult to satisfy condition of diffuse sound field and modification factor is applied to complement that. Correction factor when measuring transmission loss using semi-reverberation chamber is required accuracy because it works as main factor determining reliability of reuslts on transmission loss. In this study, it is analyzed that an effect on correction factor based on varying materials and sizes of specimens in order to deduction of it. Also It is confirmed that applied by elicited correction factor with actual railway vehicle's floor has reliability.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
• /
• pp.153-153
• /
• 2013

Turbomolecular pump (TMP) is widely used to obtain and maintain high vacuum by spinning turbine rotors to migrate gas molecules to the exhaust of the pump. However, performance of the TMP has not been well observed when it is influenced by strong magnetic field. Such study may give useful information about magnetic field tolerance of TMP, development of magnetic shielding technique for key components of TMP, etc. For this purpose, magnetic field induced by a circular current source was firstly designed and investigated. Using spherical coordinates and vector potential, magnetic field throughout the space including axis of rotation was calculated. Due to the rotational symmetry of the circular current source, induced magnetic field is azimuthally symmetric and, thus, is analyzed by radial and polar components of the magnetic fields. In order to enhance the numerical accuracy for the calculation, magnetic field was expressed by complete elliptic integrals of first and second kinds. According to the calculation, when 1 A of DC-current passes through a 1 turned circular wire with 50 cm of diameter, overall magnitude of the inducedmagnetic field was about 0.02 Gauss, which was used to the determination of the current and the number of turns of wires to fabricate the coil for the study on the magnetic field tolerance of TMP.

• 대한방사선기술학회지:방사선기술과학
• /
• 제8권2호
• /
• pp.71-72
• /
• 1985

This study was performed on the dose distribution of various field size and the effect of penumbra shield in the telecobalt unit. The results obtained are as follows. 1. Errors of the light and ${\gamma}-ray$ field size was below the regulation as 0.52 percentage. 2. The coefficient of field area was increased with the larger field area, and this coefficient was showed the more difference in larger SSD. 3. The rectangular field areas, which were described by level of the same percentage depth does, were decreased with the more elongation factor. At the same elongation factor, the compensating factor was decreased with the larger field size. 4. The lead block or extension collimator was able to shield r-ray exposure of outside field size from 50 to 80 percentage. 5. On the matching adjacent fields, while the gap between beam edges are contacted, that overlapped beam edges indicated up to 140 percentage, and while the gap was 1 cm, it could be reduced to 90 Percentage. The lead-libocking on the overlapped area was more effective to lower dose, as 80 percentage in this case. 6. Percentage depth dose of various trimming field sizes were increased linearlly according to area 1 perimeter size, but the center split field size did not maintain linearlly.

• 한국정보통신학회논문지
• /
• 제5권2호
• /
• pp.315-320
• /
• 2001

본 논문은 뇌운의 접근에 따라 변화하는 대지전장 측정을 위하여 필드 밑을 이용한 대지전장 측정장치의 개발에 관하여 기술하였다. 필드 밀은 두 개의 절연된 전극으로 구성되며, 회전전극과 고정 전극이 있다. 고정도 필드 밀 개발을 위하여 회전형 필드 밀의 원리 및 설계기법에 관하여 연구하였으며, 교정실험장치로 원통형 가드전극계 및 평행평판 전극계의 두 가지 방법을 이용하여 주파수 대역 및 응답감도 특성을 조사하였다. 교정 실험결과로부터 주파수 대역 및 응답감도는 DC ~ 200(Hz), 0.267[mV/V/m]로 얻어졌으며 73[V/m] ~ 18.7[㎸/m] 범위의 대지전장 변화의 측정이 가능하다.

• 한국통신학회논문지
• /
• 제37A권12호
• /
• pp.1031-1037
• /
• 2012

Tonelli-Shanks 알고리즘을 변형한 새로운 알고리즘을 통해 효율적으로 제곱근 및 세제곱근을 찾을 수 있는 방법을 연구하였다. 이 논문에서 소개하는 제곱근을 찾는 알고리즘은 Number Field Sieve에 응용할 수 있다. 큰 합성수를 인수분해하는데 가장 효율적인 알고리즘으로 알려진 Number Field Sieve (NFS)는 법 N에 대하여 공통근을 갖는 두 다항식 선택한 후에, sieving, linear algebra, square root 단계를 차례대로 거친다. NFS의 마지막 단계에서는 수체(Number Field)상에서 제곱근을 구하는 과정이 필요한데 이를 유한체(Finite Field)상으로 내려서 계산한 후 CRT(Chinese Remainder Theorem)을 이용하여 수체 상에서의 제곱근으로 복원하는 과정에서 제안된 알고리즘이 사용될 수 있다.

• 조명전기설비학회논문지
• /
• 제15권3호
• /
• pp.51-56
• /
• 2001

본 논문에서는 침대평판 전극구조를 구성하여 침전극에 직류 정 ·부 고전압을 인가한 경우 전계와 자계가 직각방향으로 형성되도록 하고 자계가 코로나 방전현상에 미치는 영향을 측정하고 분석하였다. 정의 고전압을 인가한 경우 자계인가에 의해 방전코로나 영역이 확장되고 이때 흐르는 코로나전류가 감소하였고, 절연파괴전압은 증가되었다. 그러나 부의 고전압을 인가한 경우는 방전코로나 영역이 오히려 축소되고 흐르는 전류가 증가되었으며 절연파괴전압은 감소되었다. 이는 전자계가 동시에 존재하는 영역에서 코로나방전에 의해 생성된 전하들의 로렌쯔력에 의한 싸이크로트론 운동 때문인 것으로 생각된다.

• 대한안전경영과학회지
• /
• 제17권3호
• /
• pp.1-7
• /
• 2015

The study conducted questionnaire analysis to 413 industrial safety field employees in order to examine the necessity and validity of industrial safety field's 17th neo-job classification based on National Competency standards(NCS). As a result, 50.1% of industrial safety management field and 43.3% of industrial health management field answered that classification details of occupational safety and health management field are classified by job(duty) performance. Industrial safety management field recognizes that management and engineering section play a significant role in their work, while industrial health management field recognizes worker's health care and work environment management and overall control of work environment assessment to be significant in their work. Furthermore, industrial safety management field recognizes that separating qualification and foundation of 'construction safety manager', 'chemicals(safety and health) manager', '(toxic)risk assessment evaluator or risk factor manager' to be highly significant. The study is meaningful in that it suggests industrial safety field's qualification items practical in industrial sites.

• International Journal of Knowledge Content Development & Technology
• /
• 제13권2호
• /
• pp.89-104
• /
• 2023

The purpose of this study was to propose ways to improve the library field practice of Department of Library and Information Science to improve the field environment and educational content, enhance students' field practice, increase efficiency, and increase students' satisfaction. To this end, a survey and interview survey were conducted on students who were going to do field training, and the results are as follows. First, students were well aware of what preparations should be made at school before going to field training. Second, students showed high awareness of their rights guarantees and requests for action in the event of problems at field training institutions. Third, students showed a high demand that field training should guarantee the minimum hourly wage. What is an issue in this regard is that policies that can satisfy both the burden of universities for continuous student guidance and evaluation, the burden of training institutions to conduct education while paying practical expenses, and the rights of students to be protected. This study was aimed at students, but it seems that realistic field practice policies should be presented from various angles as research on government ministries or university authorities is added.

• 한방비만학회지
• /
• 제22권1호
• /
• pp.21-29
• /
• 2022

Objectives: This study aimed to examine the changes in ingredients according to its cultivation method by examining the content of saponin and non-saponin components of ginseng. Methods: Ginseng saponin component analysis was compared and reviewed using the high-performance liquid chromatography method, and acidic polysaccharide component was measured using the carbazole sulfuric acid method. Results: The comparative analysis of ginseng saponin content of 4 and 6 years old fresh ginseng showed the following results. According to the cultivation method, upland field cultivation fresh ginseng showed higher average content of crude saponin than paddy field cultivation fresh ginseng. Whereas, paddy field cultivation fresh ginseng showed higher average content of total saponin than upland field cultivation fresh ginseng. Ginsenoside Rb1 showed higher content of paddy field cultivation fresh ginseng than upland field cultivation fresh ginseng in 6 years old ginseng. However, it showed higher content of upland field cultivation fresh ginseng than paddy field cultivation fresh ginseng in 4 years old ginseng. Additionally, ginsenoside Rg1 showed higher content of paddy field cultivation fresh ginseng than upland field cultivation fresh ginseng in 6 years old ginseng, whereas upland field cultivation fresh ginseng showed higher content of paddy field cultivation fresh ginseng in 4 years old ginseng. The effect on the content of ginseng saponins and acidic polysaccharides according to paddy field and upland field cultivation methods is considered to be small. Conclusions: The paddy field cultivation method, which is more efficient in production cost due to depletion of farmland and long-distance cultivation, is considered to be an economical cultivation method.