• 천문학회보
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• 제41권1호
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• pp.48.3-49
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• 2016

Current high-resolution IR spectroscopy at ground-based observatories made it possible to observe $3-{\mu}m\;CH_4$ emission lines from the atmospheres of Jupiter, Saturn, and Titan through narrow atmospheric windows avoiding the counterparts of telluric $CH_4$ absorptions if proper Doppler shifts betwen Earth and these planetary objects are provided. We are also expecting low-resolution (R~300) infrared spectra of Jupiter from the upcoming observations by JUNO's infrared $2-5{\mu}m$ spectrograph during the encounter with Jupiter approximately starting from July 4, 2016. Although the spectral resolution is not enough to resolve the $3-{\mu}m$ P, Q, R branch lines of CH4, the gross envelopes of the P, Q, R branches should yield information on rotational temperatures. The rotational temperatures are useful because theycan be regarded as local temperatures, as discussed by Kim et al. (2014). Since the $3-{\mu}m\;CH_4$ emission is mostly formed at micro-bar pressure levels, the derived rotational temperatures represent the local temperatures near the hompause of Jupiter. We discuss possible sciences from the derived homopause temperatures in the auroral and non-auroral regions of Jupiter.

• 대한전자공학회논문지SD
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• 제40권8호
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• pp.555-559
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• 2003

본 논문에서는 CMOS 소자의 RF 동작을 정확히 예측하기 위해 Si 표면에서의 메탈 라인 사이의 커패시턴스 효과와 표피효과 및 근접효과를 포함한 RF IC 설계를 위한 새로운 CMOS RF 모델을 처음으로 제시하였다. Si 표면에서의 메탈 라인 사이의 커패시턴스는 레이아웃에 기초하여 모델링하였으며, 표피효과는 메탈 라인의 등가회로에 병렬회로를 부가하여 사다리꼴 등가회로로 구현하였다. 근접효과는 사다리꼴 등가회로에서 교차 결합된 인덕턴스 사이의 상호 인덕턴스를 부가함으로써 모델링하였다. 제안된 RF 모델은 BSIM 3v3에 비해 측정 데이터와 잘 일치하였으며, GHz 영역에서 소자 동작의 주파수 종속성을 잘 보여주었다.

• 전기학회논문지
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• 제64권12호
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• pp.1659-1665
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• 2015

In general, AT(Auto-transformer) is used to improve voltage sag and inductive interference in power lines and communication lines in AC electrical railway feeding system. Especially, Korean AT feeding system has different composition compared to other countries like Japan or France, so that it has some special characteristics. However, relays imported from other countries have been used in Korea, and settings of these relays should be modified and reflect distinct characteristics of Korean AT feeding system. Therefore, study about fault analysis based on modeled AT feeding system is important. In this paper, we modeled a single track AT feeding system by using PSCAD and analyzed fault current flow in case of trolley-rail short circuit fault. Finally, we presented current magnitude of each branch expressed by boosting current of AT.

• 한국정밀공학회지
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• 제16권3호통권96호
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• pp.62-71
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• 1999

Integrating micro-machined sensors and actuators on the conventional devices with the copper power lines was incompatible to fabricate the mass produced micro electromechanical system (MEMS) devices. To achieve the compatibility of the wiring method between MEMS parts and devices, we developed the three-dimensional sputter-evaporation system that coats micropatterned thin copper films on the surface of the MEMS element. The system consists of a process chamber, two branch chambers, the substrate holder, and a linear-rotary motion feedthrough. Thin copper film was sputtered and evaporated on the biocompatible polymer, Pellethane$^{circed{R}}$ and silicone, catheter that is 2 mm in diameter and 700 mm in length. The metal film coating technique with three-dimensional thin film sputter-evaporation system was developed to apply the power and signal lines on the micro active endoscope. In this paper, we developed the three-dimensional metal film sputter-evaporation system operated on the low temperature for the biopolymeric substrates used in the medical MEMS devices.

• Structural Engineering and Mechanics
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• 제84권6호
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• pp.733-741
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• 2022

The amount of natural gas that is used on a worldwide scale is continuously going up. Natural gas and acidic components, such as hydrogen sulfide and carbon dioxide, cause significant corrosion damage to transmission lines and equipment in various quantities. One of the fundamental processes in natural gas processing is the separation of acid gases, among which the safety and environmental needs due to the high toxicity of hydrogen sulfide and also to prevent wear and corrosion of pipelines and gas transmission and distribution equipment, the necessity of sulfide separation Hydrogen is more essential than carbon dioxide and other compounds. Given this problem's significance, this endeavor aims to extend the lifespan of the transmission lines' pipes for gas and oil. Zinc oxide nanoparticles made from the environmentally friendly source of Allium scabriscapum have been employed to accomplish this crucial purpose. This is a simple, safe and cheap synthesis method compared to other methods, especially chemical methods. The formation of zinc oxide nanoparticles was shown by forming an absorption peak at a wavelength of about 355 nm using a spectrophotometric device and an X-ray diffraction pattern. The size and morphology of synthesized nanoparticles were determined by scanning and transmission electron microscope, and the range of size changes of nanoparticles was determined by dynamic light scattering device.

• 한국잠사곤충학회지
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• 제38권2호
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• pp.93-99
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• 1996

고조삽목후 삽수의 동아가 발아할 때 0.1~0.4% Colchicine 수용액을 4~5일간 적하하여 용천뽕의 동질4배체 2계통, 영변뽕의 동질4배체 1계통을 육성하였으며 주요 재배학적 특성은 다음과 같다. 1. 봄철의 탈포기는 모품종보다 2일간 늦으나 발아후의 발육속도가 빨라서 5개엽기는 모품종과 동일한 중생뽕이었다. 2. 잎모양은 폭광형이고 잎자루는 길고 굵으며 잎두께는 모품종보다 17~33% 두껍고 1엽중은 무겁고 잎면적중은 21~31% 증가하고 엽록소함량은 11~33% 증가하여 우수한 엽질적 요소를 갖추었다. 3. 모품종보다 가지길이는 짧고 가지수도 적으며 마디사이길이는 같거나 약간 길어지며 굵어져서 가지의 구성요소는 다소 불량하였디. 4. 가지끝마름길이 비율로 나타낸 내동성은 4원뽕 23호, 24호는 용천뽕과 비슷하고 4원뽕25호는 영변뽕보다 강하였고 뽕나무 오갈병 발생율은 높았다. 5. 모품종보다 수량성은 낮고 신초엽량비율과 정엽량비율은 약간 높았다. 6. 4원뽕23호와 24호는 염성이 비교적 높아서 62%의 교잡성공율을 나타내었으나 4원뽕25호는 염성이 낮고 교잡성공률은 23.9%이었다.

• 복식
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• 제61권5호
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• pp.1-20
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• 2011

As a follow-up of a study on design strategies to improve Korea's Korean coast guarduniforms, this study set out to propose Korean coast guard uniforms of a new concept that would meet the changing needs of the times and match the advanced technology and work environments. Three concepts of classical, nautical and techno chic were identified from the design strategies of the previous study. Using the results from a prototype show and preference survey, the investigator divided items into design, color, material, and detail and reflects demands for each of them. As a result, design was examined in four aspects of identity, acknowledgement, unity, and practicality and focused its improvement factors on design differentiated from other organizations' uniforms including ground police, segmentation of size system, adjustment of the length of upper garment to consider activity, and changes to the lines and silhouette to give out a modern image. As for color, the focus was placed on differentiated colors from other organizations' uniforms including ground police through dark blue and ocean color, change toward colors that reflect environmental characteristics, and unity in colors between the summer and winter uniform. As for material, the focus of improvement was put on elasticity, resistance against contamination, warmth retention, texture, wearing sensation, and functionality by taking into account convenience for field workers on coast guard vessels and branch offices who have much time in contact with ocean environments in order to make the materials high-grade. As for detail, structural details were added to give out a modern image such as changing the detail lines, efficiency of storage space, buttons, sleeve hems, ironing lines, and neck collars by taking into account environmental characteristics. The significance of the study lies in that it proposed a development model for large-scale uniform copy design by establishing copy design that secures functionality and is proper for an organization's social and cultural environment.

• 조명전기설비학회논문지
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• 제21권1호
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• pp.35-41
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• 2007

최근 고품질의 정보통신서비스와 안정한 전력공급에 대한 사회적 요구가 증가하고 있다. 본 연구에서는 뇌서지로부터 정보통신설비를 효과적으로 보호하는 대책을 제안하기 위해서 실규모 실험회로를 적용하여 여러 가지 설치조건에 따른 서지보호기의 보호효과를 실험적으로 조사하였다. 그 결과 전원계통의 접지방식, 분기회로의 수, 접지선의 배선방법 등에 따라 서지보호기의 보호효과는 크게 다른 것으로 밝혀졌다. 정보화 기기용 서지보호기를 설치하는 경우, 전원선과 통신선을 포함하는 공통접지방식과 접지선을 전원선과 일괄하여 금속관 내에 배선하는 것이 서지보호기의 서지차단성능의 향상에 가장 효과적이었다.

• 가정과삶의질연구
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• 제22권4호
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• pp.43-61
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• 2004

The purpose of this study was to verify the usefulness of kinetic House- Tree- Person drawing as a diagnostic measure for the degree of self-differentiation, which is an essential part of college students' development. Participants for the study were four hundred thirty five(272 male and 163 female) university freshmen enrolled in 4-year colleges located in Pusan. The Participants completed a scale of self-differentiation and a Kinetic House- Tree-Person drawings test. The evaluation system for kinetic House-Tree-Person drawings was established based on the indexes of Buck(1948) and Bums(1972) and used exiting literatures as reference. The data were analyzed using means, standard deviations, t-test, one-way ANOVA, and Scheffe's test. The results obtained from the study are as follows: First, the mean level of college students' self-differentiation was 2.81, which is about average. Some significant gender differences were found in the areas of self-intergration, family projection, and emotional separation. Male students scored higher on self-intergration, whereas female students score higher on family projection and emotional separation. Second. self-differentiation was higher when the student drew a house with smoke coming out of the chimney, a single-story house with flat roof, or with detailed description of curtains, roof and roof tiles. Third, self-differentiation seemed to be higher when branches and fruits were included, when there was no expression of roots, when large crowns and branch openings were presented, and when no slant lines or base lines appeared. Forth, self-differentiation showed ㅁ higher level when the portrait shows eyes, mouth and neck without omission, when it included the whole body instead of face only, and when there was no person with just a profile, a back, or with a stiff posture, and when there was no weak and thin lines. Individuality also marked higher if a person was in motion and than one person was added. Finally, self-differentiation showed significant difference according to the overall harmony of the drawing, ordering of contents, hand pressure, the kind and shape of tree, and presence of other persons. The more harmonious the picture was, and the more family members are added, the higher the level of self-differentiation was.

• Asian Pacific Journal of Cancer Prevention
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• 제16권17호
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• pp.7613-7618
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• 2015

Childhood acute lymphoblastic leukemia (ALL) is one of the most common hematologic malignancies which accounts for one fourth of all childhood cancer cases. Exposure to environmental factors around the time of conception or pregnancy can increase the risk of ALL in the offspring. This study aimed to evaluate the influence of prenatal and postnatal exposure to high voltage power lines on the incidence of childhood ALL. It also examines the role of various factors such as environmental factors and alpha-amylase as a marker in the development of leukemia.This cross-sectional case control study was carried out on 22 cases and 100 controls who born and lived in low socioeconomic families in Tehran and were hospitalized for therapeutic purposes in different hospitals ofrom 2013-2014. With regard to the underlying risk factors; familial history and parental factors were detected as risk factors of ALL but in this age, socioeonomic and zonal matched case control study, prenatal and childhood exposure to high voltage power lines was considered as the most important environmental risk factor (p=0.006, OR=3.651, CI 95% 1.692-7.878). As the population study was from low socioeconomic state, use of mobiles, computers and microwaves was negligible. Moreover prenatal and postnatal exposure to all indoor electrically charged objects were not detected as significant environmental factors in the present study. This work defined the risk of environmental especially continuous pre and postnatal exposure to high voltage power lines and living in pollutant regions through the parents or children as well as the previously described risk factors of ALL for the first time in low socioeconomic status Iranian population.