• 한국정밀공학회지
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• 제29권9호
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• pp.1026-1034
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• 2012

The purpose of this study was to verify the validation of effect on improvement of muscle strength unbalance according to exercise load deviation during rowing exercise. We performed evaluation of muscular activity and joint torque before the test. We recruited twenty subjects who one side's muscle strength is bigger in more 20% than other side. Subjects divided two groups. One is dominant left side and the other was dominant right side. Subjects performed rowing exercise in electric load deviation rowing equipment (Robo.gym, Humonic Co., Ltd., Daegu, Korea). Exercise performed four sets a day including 25 times a set, and three days a week. Measurements consist of evaluation of muscular activity and joint torque. Exercise load deviation adapted that different value of muscle strength in both arms multiplied 1RM% and added 1RM 50%. The results in adapted load deviation showed that the differences of maximal peak torque in 22.75% were getting increase significantly during exercise in 5.72%. This interpreted that rowing exercise with loading deviation types could provide muscle strength and muscular endurance exercise in same time for balance. Our study found out that loading deviation could provide muscle strength and muscular endurance exercise for improving muscle unbalance.

• 한국산학기술학회논문지
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• 제12권9호
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• pp.3815-3826
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• 2011

본 연구는 아직 잘 알려지지 않은 고려말 조선초의 상류층 여성복식을 고증하여 구체관절인형의상 세트를 시험제작하고 한국 문화상품의 아름다움을 알리기 위한 것이다. 고려말 조선초의 상류층 여성복식은 풍성한 실루엣, 원과 명 복식과의 융합, 옛 고려풍의 부활, 발달한 모시 직조기술, 불교문화 복식이라는 특성을 가진다. 13-14C의 문헌과 유물과 회화를 통한 연구자의 고증과 패턴제작 과정을 거쳐 총 8점의 아이템이 외주제작되었다. 각 아이템은 세트로 구성되었으나 소비자가 단품으로 선택할 수 있으며 다양한 조합이 가능하다. 인체와 특성이 다른 구체관절인형의 바디로 인해 부분적으로 다아트와 작은 고름이 첨가되고 강직한 직물이 사용되었다. 이후로는 기성품 생산을 위한 업체 시스템 개발 연구가 필요하다.

• 대한조선학회논문집
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• 제32권4호
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• pp.55-63
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• 1995

본 논문은 경계적분법에 의해 날개끝판이 부착된 프로펠러(EPP)의 성능을 해석하는 방법을 기술하고 있다. 나선 프로펠러 날개와 날개끝판을 사각형 판요소로 치환하고, 균일 세기의 쏘오스와 법선 다이폴을 분포하여 해석한다. 포텐셜을 기저로 하는 정식화 과정을 통해 적분방정식을 구하고, 나선날개와 날개끝판에서 동시에 법선방향 비침투조건을 만족시킴으로써 섭동 속도 포텐셜을 구하였다. Kutta조건은 반복작업을 통해 나선날개와 날개끝판의 뒷날에서 압력점프가 없어지도록 함으로써 만족시켰다. 예제계산을 통하여 날개끝판이 나선날개의 날개끝 부근의 하중을 증가시킴을 보였고, 동시에 날개끝판의 뒷날에 걸쳐 후연 보오텍스를 분산시킴으로써 강력한 날개끝 보오텍스의 형성을 피할 수 있음을 확인하였다. EPP의 성능을 추정한 결과는 실험결과와 좋은 일치를 보인다. 에너지절약 추진장치로 채택될 수 있는 EPP의 설계 및 해석을 위하여 본 연구에서 확립된 방법이 적용가능하리라 판단된다.

• 지구물리
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• 제4권1호
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• pp.21-33
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• 2001

한반도의 일차원 지각구조모델 결정을 위하여 1991년부터 1998년까지 한국 기상청 지진관측망에 기록된 국지지진의 P-파의 도달시각자료에 대해 동시역산방법을 적용하였다. 역산에는 29개 지진의 178개 관측자료가 이용되었다. 한반도의 지각과 상부맨틀의 평균속도는 각각 6.3km/sec, 7.9km/sec 이며, 평균 지각 두께는 약 33km로 나타났다. 또한, 하부지각에 저속도층의 가능성을 보여주었다. 동시역산 방법은 진원요소, 관측소 보정치, 속도구조를 동시에 결정하기 위해 적용된다. 11개 관측소에 대한 관측소 보정치는 0～1.2sec 정도의 차이를 보인다. Synthetic data의 분석은 평균 지각 속도구조 뿐만 아니라, 진앙의 위치, 관측소 보정치가 신뢰할 만하다는 것을 보여준다.

• 한국산업융합학회 논문집
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• 제24권5호
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• pp.589-596
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• 2021

In this study, the optimum gating system was designed, and the two zinc alloy worm gears were manufactured in single process by applying a symmetrical gating system with 2 runners. The SRG ratio is set to 1 : 0.9 : 0.6, and the cross-sectional shapes such as sprue, runner and gate are designed. In order to determine whether the design of the gating system is appropriate, casting analysis was carried out. It takes 4.380 s to charge the casting 100%, 0.55 to 0.6 m/s at the gates and solidification begins after the casting is fully charged. The amount of air entrapment is 2% in the left gear and 6% in the right gear. Hot spots occurred in the center hole of the gear, and pores were found to occur around the upper part of the hole. Therefore, the design of the casting method is suitable for worm gears. CT analysis showed that all parts of worm gear were distributed with fine pores and some coarse pores were distributed around the central hole of worm gear. The yield strength and tensile strength were 220 MPa, 285 MPa, and the elongation rate was 8%. Vickers hardness is 82 HV.

• 한국비블리아학회지
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• 제32권3호
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• pp.23-44
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• 2021

본 연구에서는 복합문화기관의 정보서비스를 지원하기 위해 기존의 복합문화기관에서 사용되는 서지데이터를 상호 연계할 수 있는 방안을 제안하였다. 이를 위해 MODS, EAD, CDWA 등 현재 복합문화기관에서 사용하고 있는 기존 메타데이터를 대상으로, 이들 표준을 FRBR 기반의 BIBFRAME 구조와 연계시킬 수 있는 연계 속성을 구성하였다. 연구 결과, 저작 계층, 인스턴스 계층, 개별자료 계층, 책임표시사항, 주제에 대한 기술요소를 BIBFRAME 기반으로 설정하였으며, 서지데이터의 연계를 위한 총 19개의 상위 요소, 18개의 하위 요소 및 12개의 연계 속성을 도출하였다. 이를 기반으로, 자료 유형에 따라 적용된 이질적인 메타데이터를 상호 연계할 수 있는 서지적 환경을 구축하였다. 이를 통해 복합문화기관의 분산된 서지데이터를 통합적으로 연계함으로써 보다 효율적으로 복합적인 정보서비스를 제공하는데 적용할 수 있을 것으로 기대된다.

• 산업경영시스템학회지
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• 제42권1호
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• pp.143-150
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• 2019

We focus on the weapon target assignment and fire scheduling problem (WTAFSP) with the objective of minimizing the makespan, i.e., the latest completion time of a given set of firing operations. In this study, we assume that there are m available weapons to fire at n targets (> m). The artillery attack operation consists of two steps of sequential procedure : assignment of weapons to the targets; and scheduling firing operations against the targets that are assigned to each weapon. This problem is a combination of weapon target assignment problem (WTAP) and fire scheduling problem (FSP). To solve this problem, we define the problem with a mixed integer programming model. Then, we develop exact algorithms based on a dynamic programming technique. Also, we suggest how to find lower bounds and upper bounds to a given problem. To evaluate the performance of developed exact algorithms, computational experiments are performed on randomly generated problems. From the results, we can see suggested exact algorithm solves problems of a medium size within a reasonable amount of computation time. Also, the results show that the computation time required for suggested exact algorithm can be seen to increase rapidly as the problem size grows. We report the result with analysis and give directions for future research for this study. This study is meaningful in that it suggests an exact algorithm for a more realistic problem than existing researches. Also, this study can provide a basis for developing algorithms that can solve larger size problems.

• Ocean Systems Engineering
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• 제9권3호
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• pp.287-328
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• 2019

Comprehensive understanding of the flood risk assessments via frequency analysis often demands multivariate designs under the different notations of return periods. Flood is a tri-variate random consequence, which often pointing the unreliability of univariate return period and demands for the joint dependency construction by accounting its multiple intercorrelated flood vectors i.e., flood peak, volume & durations. Selecting the most parsimonious probability functions for demonstrating univariate flood marginals distributions is often a mandatory pre-processing desire before the establishment of joint dependency. Especially under copulas methodology, which often allows the practitioner to model univariate marginals separately from their joint constructions. Parametric density approximations often hypothesized that the random samples must follow some specific or predefine probability density functions, which usually defines different estimates especially in the tail of distributions. Concentrations of the upper tail often seem interesting during flood modelling also, no evidence exhibited in favours of any fixed distributions, which often characterized through the trial and error procedure based on goodness-of-fit measures. On another side, model performance evaluations and selections of best-fitted distributions often demand precise investigations via comparing the relative sample reproducing capabilities otherwise, inconsistencies might reveal uncertainty. Also, the strength & weakness of different fitness statistics usually vary and having different extent during demonstrating gaps and dispensary among fitted distributions. In this literature, selections efforts of marginal distributions of flood variables are incorporated by employing an interactive set of parametric functions for event-based (or Block annual maxima) samples over the 50-years continuously-distributed streamflow characteristics for the Kelantan River basin at Gulliemard Bridge, Malaysia. Model fitness criteria are examined based on the degree of agreements between cumulative empirical and theoretical probabilities. Both the analytical as well as graphically visual inspections are undertaken to strengthen much decisive evidence in favour of best-fitted probability density.

• 한국컴퓨터그래픽스학회논문지
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• 제25권3호
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• pp.93-103
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• 2019

3차원상의 자유곡면에 대한 효율적인 기하 연산을 지원하기 위한 새로운 공간자료구조로서 토러스 패치 기반 정밀 근사를 이용한 자유곡면의 기하학적 처리 기법을 소개한다. 토러스는 곡률이 양이나 음인 경우뿐만 아니라, 0인 부분도 있으므로 자유곡면의 볼록, 오목 여부에 상관없이 곡면을 정밀하게 근사할 수 있다. 전통적인 기법과 달리 토러스 패치는 자유곡면의 법벡터 방향까지 쉽게 모델링할 수 있고, 토러스의 오프셋은 다시 토러스가 되므로 다양한 기하 연산의 가속화를 지원할 수 있다. 자유곡면과 이를 근사하는 토러스 패치 집합 사이의 양방향 하우스도르프 거 리의 상한을 계산하여 토러스 패치를 이용하여 자유곡면을 높은 정밀도로 근사할 수 있음을 보였다. 이 기법을 이용하여 두 자유곡면의 교차곡선 계산과 자유곡면의 오프셋 곡면 생성을 쉽게 처리할 수 있음을 보였다.

• 산업경영시스템학회지
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• 제42권3호
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• pp.184-192
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• 2019

Focusing on the emerging influencer market of SNS (Social Network Service), This study attempts to clarify the priority of Influencer characteristics when the customer decided to purchase products through the promotion of influencers. Since the influencer marketing differs from the Online information source marketing, this study has an academic implication in that integrated the influence of the characteristics of the Online information sources and the characteristics of SNS contents. For this purpose, through the literature research on Information sources and Influencers, the characteristics of influencers were reconstructed and priorities were derived using the AHP (Analytic Hierarchy Process) technique. The upper layer of the AHP structure was set to expertise, trustworthiness, social attractiveness, and content attractiveness, and the lower layer structured the model with 13 subfactors. The results are summarized as follows. First, in the result of combining the importance of the $1^{st}$ and $2^{nd}$ classes, the detailed factors of expertise and trustworthiness, ranked from the top to six, are largely influenced in purchasing decisions in influencer marketing. Second, content attractiveness is the third rank in the $1^{st}$ layer. Influencer marketing shows that content is more important than social attractiveness. Besides, the $7^{th}$ to $9^{th}$ positions of the overall rankings accounted for visual information, storytelling, and external attractiveness, which are the details of content attractiveness, and it is confirmed that it is more effective for influencer marketing to emphasize content attractiveness than social attractiveness. Although the influencer marketing differs from the existing information marketing, this study has an academic implication in that integrated the influence of the characteristics of the source and the characteristics of the contents.