• 한국방사선학회논문지
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• 제15권6호
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• pp.821-831
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• 2021

PENELOPE Code를 사용하여 에너지 및 효율 교정하기 위해 부피선원을 사용하여 PENELOPE simulation 하였다. 여기서 동시 계측 보정하여 피크 효율 및 유용성을 검증하고자 한다. 모든 부피에 대한 일치 합산 보정을 계산을 위해 먼저 실린더 및 마리넬리 비커 4개의 부피를 3개의 높이로 다시 세분화 한다. 따라서 3개의 영역에서의 동시계측보정계수와 부피선원 전체에 대한 동시계측보정계수가 출력t으로 산출하게 된다. 부피선원의 영역별 효율 정보를 포함한 검출기입력파일은 Penelope 시뮬레이션을 사용하여 획득한다. 낮은 에너지에서는 각 소스 체적(50~300 ml)에 대한 J값이 작고 높은 에너지 범위에서는 크게 증가한다. 시뮬레이션 결과 최대 4%인 50 ml 및 300 ml를 제외하고 모든 선원 부피에 대해 2.5% 이내에서 잘 일치하였다. 이는 계측 시 동시계측효과에 대한 보정이 실효성이 있음을 의미한다. 또한, 이를 기반으로 다양한 선원 및 환경시료 측정 시 검출 효율성을 개선할 수 있는 이점이 있음을 확인할 수 있다.

• 한국항해학회지
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• 제8권2호
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• pp.1-13
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• 1984

This paper concerns computerization of the altitude correction in the sight reduction process. To obtain observed altitude, the factors such as refraction, parallx, semidiameter, phase etc, are corrected to sextant altitude. The factors are the arguments into the nautical almanac table from which are extracted values to add to or substract from the raw sight to obtain corrected value. If the altitude correction is to be done by sophisticated calculator, each factors must be formulated. The author studies the formulation of above factors, and simply from the date and ephemeris time of the sighting calculate the values of the factors. The calculated values are compared with that from nautical almanac, and it is confirmed that the formulae are practically used.

• 대한원격탐사학회지
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• 제14권2호
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• pp.117-128
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• 1998

본 연구는 Topeux/Poseidon 위성의 첫 운행인 1992년 9월~1994년 8월(2년간, 73 사이클) 동안에 남인도양의 암스테르담-코호제트-케르겔른 지역(35$^{\circ}$-55$^{\circ}$S, 55$^{\circ}$-80$^{\circ}$E)에서의 환경학적 보정인자들의 특성을 조사하기 위하여 수행되었다. 환경 보정인자들의 특성이 지역에 따라 어떻게 다른가를 알아 보기 위하여, 상승 지상트랙 103이 지나는 암스테르담-케르겔른 대지지역과 하강 지상트랙 170이 지나는 코호제트 분지지역으로 구분하여 비교하였다. 전리권, 건조 및 습윤 대류권, 전자기적 편차, 탄성조, 하중조들과 같은 보정인자들의 변화폭은 일반적으로 수 cm 이하로 나타났으나, 해양조 및 해면기압의 변화폭은 각각 30~35cm, 15~30cm로서 다른 보정인자들의 변화폭 보다 상당히 높게 나타났다. 남인도 양의 해수면 변화는 주로 해양조석에 기인하며 그 기여도는 80~90%에 이른다. 그리고 두 번째의 기여 인자는 해면기압으로 무시할 수 없을 정도로 중요한 환경 보정인자임을 알 수 있었다

• 한국건축시공학회지
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• 제8권2호
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• pp.107-112
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• 2008

According to Korean Architectural Standard Specification (KASS) , at the design stage of the specified concrete strength, strength correction with each temperature level should be considered to secure required strength at 28 days even in low temperature condition, In this paper, the period for the strength correction at the stage of mixture design of the concrete using ordinary Portland cement(OPC) specified in KASS was determined with each region of south Korea based on the meteorological data of KMA(Korea meteorological administration) by applying KASS-5 regulation. In case of 28 days of strength control age, the period for strength correction with 6MPa was calculated to $50{\sim}60$ days and, with 3 MPa. to around 80 days. The period for the strength correction was shown to be decreased with the rise of altitude. The period to consider the delay of the strength development due to low temperature including the period of cold weather concrete was nearly 7 months around 1 year. References for determining the strength correction factors with each region of south Korea was provided in this paper. Further investigation of strength correction of the concrete containing blended cement is to studied.

• 한국ITS학회 논문지
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• 제10권5호
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• pp.87-92
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• 2011

본 논문에서는 800 ~ 900 MHz 주파수 대역에서 러시아 PNG 지역에 오쿠무라-하타 모델을 적용하여 경로 손실식을 구하였다. 기존의 경로 손실 모델을 이용하여 러시아 PNG 지역의 새로운 경로 손실 특성식을 구하기 위해서, 최소 자승 평균 기법을 적용하여 기존 모델에 대한 수정치를 구하였다. 자유 공간 및 하타 모델과 측정치의 수정치가 28, 13 dB 임을 알 수 있었으며, 이 값을 적용하여 러시아 PNG 지역에 맞는 새로운 경로손실 모델을 제시하였다.

• 한국의상디자인학회지
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• 제17권3호
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• pp.159-168
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• 2015

In this study, visual evaluation was wide pants with changes in length of pants and width of hem line of wide pants design to provide data which can enhance wearing image effects at the production of wide pants. According to the length of pants and width of hem line of wide pants, a total of 9 stimulants were chosen. Then, they were evaluated using a seven-point rating scale against 40 fashion students. The data has been analyzed by Factor Analysis, ANOVA, $Scheff{\acute{e}}$'s Test and the MCA method. The results of the study are as follows : 1. According to factor analysis, the components of visual evaluation depending on the length of pants and width of hem line of wide pants were divided into five factors: individuality, body correction, modesty, body length and cute. 2. According to visual evaluation depending on changes in the length of pants, no significant difference was found in all five positions. 3. According to visual evaluation depending on changes in the length of pants and width of hem line of wide pants, 'width of hem line 60, 100' revealed a significant difference in body correction. 'width of hem line 80' revealed a significant difference in body correction and body length. 4. In terms of interactions over changes in the length of pants and width of hem line of wide pants, no interaction effects were found in all five factors. According to multiple classification analysis(MCA) on the factors without interaction effects, length of pants had more effect on visual image in body correction, body length and cute. In other factors, more influence was observed depending on the width of hem line.

• Wind and Structures
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• 제18권4호
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• pp.423-441
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• 2014

The high frequency base balance (HFBB) technique is a convenient and relatively fast wind tunnel testing technique for predicting wind-induced forces for tall building design. While modern tall building design has seen a number architecturally remarkable buildings constructed recently, the characteristics of those buildings are significantly different to those that were common when the HFBB technique was originally developed. In particular, the prediction of generalized forces for buildings with 3-dimensional mode shapes has a number of inherent uncertainties and challenges that need to be overcome to accurately predict building loads and responses. As an alternative to the more conventional application of general mode shape correction factors, an analysis methodology, referred to as the linear-mode-shape (LMS) method, has been recently developed to allow better estimates of the generalized forces by establishing a new set of centers at which the translational mode shapes are linear. The LMS method was initially evaluated and compared with the methods using mode shape correction factors for a rectangular building, which was wind tunnel tested in isolation in an open terrain for five incident wind angles at $22.5^{\circ}$ increments from $0^{\circ}$ to $90^{\circ}$. The results demonstrated that the LMS method provides more accurate predictions of the wind-induced loads and building responses than the application of mode shape correction factors. The LMS method was subsequently applied to a tall building project in Hong Kong. The building considered in the current study is located in a heavily developed business district and surrounded by tall buildings and mixed terrain. The HFBB results validated the versatility of the LMS method for the structural design of an actual tall building subjected to the varied wind characteristics caused by the surroundings. In comparison, the application of mode shape correction factors in the HFBB analysis did not directly take into account the influence of the site specific characteristics on the actual wind loads, hence their estimates of the building responses have a higher variability.

• 한국의류학회지
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• 제45권6호
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• pp.935-948
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• 2021

This study aimed to typify men's beliefs, perceptions, values, and attitudes, regarding foundation underwear, and examine the characteristics of each perception. Thirty-one statements on men's correctional underwear were selected, and Q classification was conducted with 20 men in their 30s and 40s as the P samples. Factors were extracted using principal component analysis and varimax rotation. Type 1 was the "fit improvement disadvantage cover type", which covered the target area, and improved the clothing fit. Type 2 was referred to as the "highlighting the advantages of chest correction" type, that was used to improve chest correction and exercise efficiency. "Positive wear for compensation of the abdomen", was listed as type 3, and was worn for abdominal correction. It was believed that type 3 could be used to correct body shape even if it was uncomfortable. Type 4, the "hip-up correction functional type", emphasized functionality based on its hip-up correction design.

• Structural Engineering and Mechanics
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• 제63권1호
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• pp.77-88
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• 2017

Correction Factor Method (CFM) is one of the earliest methods for simulating the actual behavior of structure according to construction sequences and practical implementation steps of the construction process which corrects the results of the conventional analysis just by the application of correction factors. The most important advantages of CFM are the simplicity and time-efficiency of the computations in estimating the final modified forces of the beams. However, considerable inaccuracy in evaluating the internal forces of the other structural members obtained by the moment equilibrium equation in the connection joints is the biggest disadvantage of the method. This paper proposes a novel method to eliminate the aforementioned defect of CFM by using the column shortening correction factors of the CFM to modify the axial stiffness of columns. In this method, the effects of construction sequences are considered by performing a single step analysis which is more time-efficient when compared to the staged analysis especially in tall buildings with higher number of elements. In order to validate the proposed method, three structures with different properties are chosen and their behaviors are investigated by application of all four methods of: conventional one-step analysis, sequential construction analysis (SCA), CFM, and currently proposed method.

• 한국해양공학회지
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• 제25권5호
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• pp.52-57
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• 2011

Most ships and offshore structures are equipped with a variety of pipes, which inevitably contain curved portions. While it has been a usual practice to conduct bending stress analyses of these curved pipes using the straight-beam theory, this paper adopts two different types of finite elements, straight-beam elements and two-dimensional shell elements, for finite element analyses of a variety of curved pipes. It then compares the analysis results for two different types of elements to determine correction factors, which can be used to transform the bending displacements and bending stresses obtained by straight-beam elements to those obtainable by two-dimensional shell elements. The paper ends with a practical suggestion on how to efficiently use these correction factors to estimate the combined axial and normal stresses in a curved portion of a pipe.