• 한국콘텐츠학회논문지
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• 제16권8호
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• pp.580-591
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• 2016

본 문헌분석 연구는 국내에서 최근 11년간 발표된 대학신입생의 학교적응 관련 문헌을 분석한 연구로, 대학신입생의 학교적응 요인을 파악하고 이에 대한 학교적응 방안과 대학 교육 프로그램 개선의 방향을 제공하고자 시도되었다. 본 문헌분석은 3개의 데이터베이스 국회도서관 자료실, 학술연구정보서비스(RISS), 한국학술정보(KISS)를 통하여 문헌 탐색기준에 의해 선택하였으며, 최종 24개의 연구가 선택되었다. 이 중 20편은 상관관계연구, 4편은 실험연구이었다. 대학신입생 학교적응 연구는 2009년부터 매년 1편씩 연구되다가 2012년부터 매년 5-6편으로 증가되어 대학 신입생의 적응에 대해 관심이 증가함을 볼 수 있다. 이 24개 문헌들에서 이용한 학교적응 조사도구는 Baker와 Siryk(1984)가 만든 도구를 23편에서 이용되었다. 분석된 상관관계 연구에서의 대학신입생 학교적응 평균은 3.25점으로 나타났다. 대학신입생의 학교적응과 관련된 변수는 20개 정도로 조사되었으며, 그 중 자기존중감, 자기효능감, 스트레스는 학교적응에 중요한 변수로 나타났다. 또한 대학신입생의 학교적응과 관련된 일반적 특성 중 외향적 성격, 가족과 사는 경우, 나이가 많은 경우, 학과에 만족한 경우, 학교생활에 만족한 경우 학교적응이 높게 나타났다. 이에 대학에서는 신입생 적응 프로그램을 계획할 때 자기효능감 증진방안, 스트레스 관리, 대학신입생을 위한 멘토-멘티 프로그램, 신입생 적응 프로그램 등을 학교와 학과에 맞게 지속적으로 진행할 것을 제언한다.

• Journal of Biosystems Engineering
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• 제32권6호
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• pp.383-388
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• 2007

In precision farming, proper calibration and operation of a variable rate machine are critical to reduce input of agrochemicals and to ensure productivity and quality of agricultural products. As an effort to introduce precision farming to rice production in Korea, a pneumatic granular applicator was developed. This investigation intended to evaluate the application performance such as application accuracy, application uniformity and to suggest how to adjust the blow-heads to get uniform application pattern, and to suggest a practical way of adjustment of the blow-heads for uniform application. Tests to evaluate the application performance were conducted. The application uniformities (CV) in both transverse direction and longitudinal direction were less than 15% and application accuracy was greater than 81%. A simple method for adjusting the inserting length of blow-heads was suggested.

• 대한공간정보학회지
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• 제11권3호
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• pp.3-11
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• 2003

본 연구는 측량용 디지털 카메라인 Rollei d7 metric과 d7 $metric^{5}$를 이용하여 촬영거리, 수렴각, 촬영방향을 변화시켜가면서 촬영을 실시하였으며, 표정 시 발생하는 오차를 최소화하기 위해 프로그램 상에서 자동적으로 상호표정 되는 원형표지를 이용하였다. 그리고 자료처리체계로는 해석적 방법 중에서 현재 가장 좋은 정도를 얻을 수 있는 광속조정법(bundle adjustment)를 이용하였다. 이러한 연구는 차후 현장에서 요구하는 정도의 사진촬영과 예상되는 정도를 판단하는데 중요한 자료로 이용될 것으로 판단된다.

• International Journal of Aeronautical and Space Sciences
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• 제9권2호
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• pp.58-63
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• 2008

This paper describes aerodynamic performance enhancement of cycloidal rotor according to the blade pivot point movement and the blade preset angle adjustment. Cycloidal blade system which consists of several blades rotating about an axis in parallel direction and changing its pitch angle periodically, is a propulsion mechanism of a new concept vertical take off and landing aircraft, cyclocopter. Based on the designed geometry of cyclocopter, numerical analysis was carried out by a general purpose commercial CFD program, STAR-CD. According to tills analysis, the efficiency of cycloidal rotor could be improved more than 15% by the introduced methods.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
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• pp.95-96
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• 2016

The floor slip test method using O-Y·PSM was developed based on the risk assessment and sense of slip by the users implementing actions such as changing walking direction on a floor. This test method is regulated under the Korea Industrial Standard KS M 3510, and in the Korea Industrial Standard KS F 3230, the article of KS M 3510 is cited. Yet, in the standard, the surface condition of test or slip adjustment method is merely mentioned or difficult to be found, and thus it creates confusion in floor slip test using O-Y·PSM. Therefore, this study is to provide the useful data to revise the relative standard through the standardization study including various surface conditions of sample and slip adjustment method used in floor slip test method using O-Y·PSM.

• ETRI Journal
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• 제41권2호
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• pp.160-166
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• 2019

A novel analytical method based on the cavity mode theory to design a metasurface (MS) is proposed in this study. We carefully analyzed the phase and amplitude characteristics of the incident wave and transmitted wave, and successfully designed a circular polarization conversion MS by introducing a cutting structure with wider operation bandwidth and higher radiation direction gain compared with that of the original MS. For the measurements, a microstrip antenna operating at 2.4 GHz was used as the source antenna to verify the designed MS. The simulation and measurement results agree well with each other.

• Wind and Structures
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• 제17권4호
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• pp.419-433
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• 2013

This paper investigates the vertical profiles of horizontal mean wind speed and direction based on the synchronized measurements from a Doppler radar profiler and an anemometer during 16 tropical cyclones at a coastal site in Hong Kong. The speed profiles with both open sea and hilly exposures were found to follow the log-law below a height of 500 m. Above this height, there was an additional wind speed shear in the profile for hilly upwind terrain. The fitting parameters with both the power-law and the log-law varied with wind strength. The direction profiles were also sensitive to local terrain setups and surrounding topographic features. For a uniform open sea terrain, wind direction veered logarithmically with height from the surface level up to the free atmospheric altitude of about 1200 m. The accumulated veering angle within the whole boundary layer was observed to be $30^{\circ}$. Mean wind direction under other terrain conditions also increased logarithmically with height above 500 m with a trend of rougher exposures corresponding to lager veering angles. A number of empirical parameters for engineering applications were presented, including the speed adjustment factors, power exponents of speed profiles, and veering angle, etc. The objective of this study aims to provide useful information on boundary layer wind characteristics for wind-resistant design of high-rise structures in coastal areas.

• Journal of the Korean Statistical Society
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• 제30권1호
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• pp.31-39
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• 2001

For estimating parameters of possibly nonlinear and/or non-stationary seasonal autoregressive(AR) processes, we introduce a new instrumental variable method which use the direction vector of the regressors in the same period as an instrument. On the basis of the new estimator, we propose new seasonal random walk tests whose limiting null distributions are standard normal regardless of the period of seasonality and types of mean adjustments. Monte-Carlo simulation shows that he powers of he proposed tests are better than those of the tests based on ordinary least squares estimator(OLSE).

• 한국측량학회:학술대회논문집
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• 한국측량학회 2007년도 춘계학술발표회 논문집
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• pp.89-92
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• 2007

This investigation aims at calculating the geoid height, distance between the ellipsoidal height and the orthometric height by GPS/Levelling data for nationwide 58 Bench Marks, and calculating the effect of geoid height to engineering public works. The accuracy of the results from baseline analyses and adjustment of a network. using GPS surveying data by nationwide 58 BM show 4mm for horizontal direction and 7cm for vertical direction. The 58 geoid height was calculated by GPS/Levelling. For a construction work field GPS/Levelling for distributed 4 BM in test area can calculate the orthometric height in 20 ppm relativity accuracy with 95% reliability. Besides the calculated geoid height in the investigation was 0.367m higher than EGM96 model. The test results of a engineering work site, the result by EGM96 model was 1.8cm in 10km and it was also 3.6cm in interpolation method. The results show that it is equivalent to levelling of $20mm\sqrt{S}$.

• 한국통신학회:학술대회논문집
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• 한국통신학회 1982년도 추계학술발표회논문집
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• pp.1-13
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• 1982

Nowadays , The function of telecommunication contributes to maintaining the peace of the world, and the internetional cooperation in the communication field can not be emphasized too much. The pioneers in telecommunication field devoted their lives to the Infinite love for humanity. However, the modern communication system in our country was initiated, in the later part of the Lee-Dynasty, not for the international cooperation but for the invasive avarices of the neighbouring nations such as Japan and China. The true internationaL cooprration should be based on the love of humanity and the peace of the world such as the pionreers. This paper proposes to resoarch the historic process of initiation and development of the international organs relating to telecommunication as well as the intenational elecomunication network. Finally, I will make the foIlowing suggestions for the promotive direction of the true international coonperation, 1. Intensification of the radio administrative power 2. Promotion of the international cooperation on the man-power and economy in telecommunication field. 3. Establishment and Adjustment of the research institutes Of telecommunication. 4. Establishment of the world telecommunication network for world-wide peace