정치 팟캐스트의 제삼자 지각 영향 요인에 관한 연구

곽정원(Jungwon Kwak),정성은(Sungeun Chung) 한국언론학회 2013 한국언론학보 Vol.57 No.1

Potcasts are emerging as a new medium for political messages. The present study investigated perceived impact of political podcasts. In particular, this study attempted to find determinants of the third-person perception about political podcasts and tests hypotheses with a controversial political podcast, Naneun Ggomsuda. An online survey was conducted to 200 proponents of Naneun Ggomsuda and 200 opponents of Naneun Ggomsuda (N=400). The results showed that individuals with negative pre-existing attitudes toward Naneun Ggomsuda indicated a lower perceived impact of media on themselves but a greater the third-person perception than those with positive pre-existing attitudes toward Naneun Ggomsuda. Perceived impact of media on others and the third-person perception were found to be higher when the others were known to have positive pre-existing attitudes than negative pre-existing attitudes. Perceived impact of media on others and the third-person perception were also found to be higher when the others were known as nonexperts about politics than as experts about politics. Theoretical and practical implications were discussed.

Reliability-based calibration of resistance factors for static bearing capacity of driven steel pipe piles

Kwak, Kiseok,Kim, Kyung Jun,Huh, Jungwon,Lee, Ju Hyung,Park, Jae Hyun Canadian Science Publishing 2010 Canadian geotechnical journal: Revue canadienne de Vol.47 No.5

<P> As part of a study to develop load and resistance factor design (LRFD) codes for foundation structures in South Korea, resistance factors for the static bearing capacity of driven steel pipe piles were calibrated in the framework of the reliability theory. A database of 52 static load test results was compiled, and the data from these load test piles were sorted into two cases: a standard penetration test (SPT) N-value at pile tip (i) less than 50 and (ii) equal to or more than 50. Reliability analyses and resistance factor calibration for the two static bearing capacity analysis methods adopted in the Korean Design standards for foundation structures were performed using the first-order reliability method (FORM) and the Monte Carlo simulation (MCS). Reliability indices and resistance factors computed by the MCS are statistically identical to those computed by FORM. Target reliability indices were selected as 2.0 and 2.33 for the group pile case and 2.5 for the single pile case. The resistance factors recommended from this study are specific for the pile foundation design and construction practice and the subsurface conditions in South Korea. </P>

국내 항타강관말뚝 설계법의 목표 신뢰도지수

곽기석(Kwak Kiseok),허정원(Huh Jungwon),김경준(Kim Kyung Jun),박재현(Park Jae Hyun),이주형(Lee Juhyung) 대한토목학회 2008 대한토목학회논문집 C Vol.28 No.1

국내 기초구조물에 대한 하중저항계수설계법 개발의 일환으로 항타강관말뚝에 대한 신뢰성 수준을 평가하고 목표 신뢰도 지수를 결정하였다. 국내 정재하시험 및 지반조사 자료를 수집하여 말뚝의 대표 측정 극한지지력을 결정하였고, 정역학적 지지력공식과 Meyerhof 경험식을 이용하여 설계 극한지지력을 산정하였다. 이들 자료의 비교ㆍ분석을 통해 저항편향계수를 산정하였다. 저항편향계수의 통계 특성을 이용하여 일차신뢰도법 및 몬테카를로 시뮬레이션에 의한 신뢰성 분석을 실시하였다. 정역학적 지지력공식은 자료의 변동성이 낮았고 Meyerhof 경험식은 내재적 보수성이 크게 나타났다. 안전율 3.0~5.0에 대한 신뢰도지수 분석 결과 정역학적 지지력공식은 1.50~2.89, Meyerhof 경험식은 1.61~2.72로 평가되었다. 신뢰성 분석 결과를 바탕으로 목표 신뢰도지수는 무리말뚝으로 시공되는 경우 2.0, 2.33을, 무리말뚝으로 시공되지 않는 경우 2.5의 값을 결정하였다. As a part of study to develop LRFD (Load and Resistance Factor Design) codes for foundation structures in Korea, reliability analyses for driven steel pipe piles are performed and the target reliability indices are selected carefully. The 58 data sets of static load tests and soil property tests conducted in the whole domestic area were collected and analyzed to determine the representative bearing capacities of the piles. The static bearing capacity formula and the Meyerhof method using N values are applied to calculate the expected design bearing capacity of the piles. The resistance bias factors were evaluated for the two static design methods by comparing the representative bearing capacities with the design values. Reliability analysis was performed by two types of advanced methods: First Order Reliability Method (FORM), and Monte Carlo Simulation (MCS) method using resistance bias factor statistics. The static bearing capacity formula exhibited relatively small variation, whereas the Meyerhof method showed relatively high inherent conservatism in the resistance bias factors. Reliability indices for safety factors in the range of 3 to 5 were evaluated respectively as 1.50~2.89 and 1.61~2.72 for both of the static bearing capacity formula and the Meyerhof method. The target reliability indices are selected as 2.0 and 2.33 for group pile case and 2.5 for single pile case, based on the reliability level of the current design practice and considering redundancy of pile group, acceptable risk level, construction quality control, and significance of individual structure.

LRFD 설계를 위한 항타강관말뚝의 저항편향계수 산정

곽기석(Kwak Kiseok),박재현(Park Jae Hyun),최용규(Choi Yongkyu),허정원(Huh Jungwon) 대한토목학회 2006 대한토목학회논문집 C Vol.26 No.5

국내 기초구조물에 대한 저항계수 산정 및 하중저항계수설계법(LRFD) 개발의 일환으로 항타강관말뚝에 대한 저항편향계수를 산정하였다. 정재하시험 및 지반조사 자료를 수집하여 국내외의 기준에 따른 극한지지력을 산정한 후 말뚝의 대표 극한지지력을 결정하였다. 자료의 통계분석 결과에 기초하면, Davisson 기준이 말뚝의 극한지지력을 가장 합리적으로 평가하는 것으로 나타났다. 정역학적 지지력 공식과 N치를 이용한 Meyerhof 경험식을 이용하여 설계 극한지지력을 산정하였다. 이들 자료의 비교ㆍ분석을 통해 항타강관말뚝의 저항편향계수는 정역학적 지지력공식과 Meyerhof 경험식에 대해 각각 0.98, 1.46으로 산정되었다. 또한 두 가지 지지력 산정방법 중 정역학적 지지력공식의 불확실성이 상대적으로 낮은 것으로 나타났다. The resistance bias factors for driven steel pipe piles are evaluated as a part of study to develop the LRFD(Load and Resistance Factor Design) for foundation structures in Korea. The 43 data sets of static load tests and soil property tests performed in the whole domestic area were collected and analyzed to determine the representative bearing capacities of the piles using various methods. Based on the statistical analysis of the data, the Davisson's criterion is proved to be the most reasonable method for estimation of pile bearing capacity among the methods used. The static bearing capacity formulas and the Meyerhof method using N values are applied to calculate the design bearing capacity of the piles. The resistance bias factors of the driven steel pipe piles are evaluated respectively as 0.98 and 1.46 by comparison of the bearing capacities for both of the static bearing capacity formulas and the Meyerhof method. It is also shown that uncertainty of the static bearing capacity formulas is relatively less than that of the Meyerhof method.

Load and resistance factors for the foundation bearing capacity of perforated caisson breakwaters

Huh, Jungwon,Doan, Nhu Son,Mac, Van Ha,Kim, Dongwook,Kwak, Kisoek 대한토목학회 2020 대한토목학회 학술대회 Vol.2020 No.10

축하중을 받는 말뚝구조물의 MCS에 기초한 신뢰성해석

허정원(Huh Jungwon),정상섬(Jeong Sang-Seom),곽기석(Kwak Kiseok) 대한토목학회 2005 대한토목학회논문집 C Vol.25 No.3

해상풍력 발전타워-기초시스템의 확률론적 위험도평가

허정원 ( Huh Jungwon ),리트렁치엔 ( Le Trung Chien ),박재현 ( Park Jae-hyun ),곽기석 ( Kwak Kiseok ) 한국구조물진단유지관리공학회 2015 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.19 No.1

Institutional Applications of Eclipse Scripting Programming Interface to Clinical Workflows in Radiation Oncology

Kim, Hojin,Kwak, Jungwon,Jeong, Chiyoung,Cho, Byungchul Korean Society of Medical Physics 2017 의학물리 Vol.28 No.3

Eclipse Scripting Application Programming Interface (ESAPI) was devised to enhance the efficiency in such treatment related workflows as contouring, treatment planning, plan quality measure, and data-mining by communicating with the treatment planning system (TPS). It is provided in the form of C# programming based toolbox, which could be modified to fit into the clinical applications. The Scripting program, however, does not offer all potential functionalities that the users intend to develop. The shortcomings can be overcome by combining the Scripting programming with user-executable program on Windows or Linux. The executed program has greater freedom in implementation, which could strengthen the ability and availability of the Scripting on the clinical applications. This work shows the use of the Scripting programming throughout the simple modification of the given toolbox. Besides, it presents the implementation of combining both Scripting and user-executed programming based on MATLAB, applied to automated dynamic MLC wedge and FIF treatment planning procedure for promoting the planning efficiency.

Evaluation of Self-Healing Performance of PE and PVA Concrete Using Flexural Test

Kang, Choonghyun,Huh, Jungwon,Tran, Quang Huy,Kwak, Kiseok Hindawi Limited 2018 Advances In Materials Science And Engineering Vol.2018 No.1

<P>The self-healing performance of PE and PVA concrete was evaluated, by using the three-point bending test with a notch. Four different crack inducement days were applied (7, 28, 49, and 91 days), and the same 21 days of healing period were applied to each case. The self-healing environments were in 20°C water, and in the curing room with 20°C temperature and 60% humidity. The flexural strength and the initial flexural stiffness of before and after healing were compared. As a result, both the strength recovery effect and the stiffness recovery effect decreased with the delay of crack inducement, and specimens in the water environment showed higher healing effect than those in the air environment. PVA fiber showed a relatively greater recovery effect than PE fiber.</P>

A Light-Weight AES Design using LFSR-based S-Box for IoT Applications

Donghui Lee,Myeongjin Kwak,Jungwon Lee,Yongtae Kim,Beomjun Kim 대한전자공학회 2022 IEIE Transactions on Smart Processing & Computing Vol.11 No.2

This paper presents a novel light-weight AES architecture based on linear feedback shift register (LFSR). Since the traditional substitution-box (S-box) of the AES architecture consumes a large amount of hardware resources, we propose LFSR-based S-box and inverse S-box designs to reduce the hardware overheads significantly. In addition, we replace the conventional AES key scheduler with the LFSR-based round key generator to improve the hardware efficiency further. When implemented in a 32-nm CMOS technology, the proposed designs improve the area, delay, power, and energy by 57.4%, 64.3%, 30.1%, and 75% in the AES-128, 52.2%, 12.5%, 21.9%, and 31.7% in the AES-192, and 54.8%, 5.2%, 23.4%, and 27.4% in the AES-256, respectively, when compared to the traditional S-box based AES architecture. In addition, a joint analysis of our designs in terms of area, delay, and energy shows that the proposed AES designs enhance the area-delay product (ADP) and energy-delay product (EDP) by up to 84.7% and 82.5%, respectively, compared to the traditional design.