해양물리모델을 이용한 화성 연안 고대포구의 선박 이동 모의

이승태(Seungtae Lee),한민(Min Han),양동윤(Dong-Yoon Yang),조양기(Yang-Ki Cho),박찬혁(Chanhyeok Park),유재형(Jaehyung Yu) 대한자원환경지질학회 2022 자원환경지질 Vol.55 No.2

본 연구는 화성 연안 지역을 대상으로 삼국 및 통일신라시대의 환경 조건에서의 해양물리모델 기반의 선박 이동을 모의하여 고대포구 추정지의 자연과학적 해석을 통한 증거를 제시하고자 하였다. 이를 위하여 연구지역의 시추공 퇴적물 분석을 통한 고지형면 복원 및 과거 지형도 기반 해안선 자료를 구축하였고, 과거 환경 조건을 기반으로 하여 FVCOM 해양물리모델을 통한 표층 조류 흐름 및 고대 선박으로 가정한 부유물질 이동 경로에 대한 모의를 수행하였다. 그 결과로, 고대포구 위치로 추정되는은수포 일대에서 포구에서부터 외해로 선박이 이동하는 경로의 모의가 잘 이루어졌으며, 자연과학적인 방법으로 고대포구 입지 추정의 신뢰성을 확보하였다. In this study, ship movement simulation was performed based on a marine physics model for the ancient port presumed under the past environmental conditions in the coastal area of Hwaseong, which played an important role as a center of trade in the Three Kingdoms and Unified Silla periods. The paleo topographical surface was reconstructed through the analysis of borehole sediments, and the paleo coastline was extracted through the geomorphological maps published during before independence. Based on the established paleo environmental conditions of the Hwaseong coast, the marine physics model (FVCOM) was used to simulate the flow of surface currents and the route of floating materials assumed to be ancient ships. As a result, the processes of moving ships from the port to the open sea in the Eunsupo area, which is estimated location of the ancient port related to Dangseong, was well simulated, and thus the reliability of the location of the ancient port estimated by the scientific method was secured. This study is significant as a result of convergence research that encompasses archeology, history, geomorpology, geology, and oceanography.

관성 센서와 압력 센서를 이용한 가변압박 슬리브

양승태(Seungtae Yang),류재욱(Jae Wook Ryu),박준일(Juneil Park),이기욱(Giuk Lee) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11

21세기 초반 한국정치에서 파퓰리즘의 의미: 정치철학적 및 정치사상사적 탐색

양승태(SeungTae Yang) 한국정치사상학회 2012 정치사상연구 Vol.18 No.1

파퓰리즘이란 말이 한국정치의 중심적인 수사로 등장하고 있다. 본디 김대중 정권 당시 야당이 된 보수정파가 집권당 및 정부의 정책을 비판하기 위해 사용되던 용어가 이제는 정치적 이념이나 성향을 막론하고 정치인들이 상대방을 공격하기 위한 수사학적 무기가 되었다. 그럼에도 불구하고 아직 한국의 정치학계는 그 의미 또는 그것의 이념적 실체를 명확하게 밝히는 작업을 제대로 수행하지 못한 것으로 보인다. 이 논문은 그와 같은 미해결의 문제를 해명하기 위한 정치철학적 연구이다. 이를 위해 이 논문은 다음 세 가지 작업을 시도한다. 첫째, 파퓰리즘이란 외래 용어의 기원, 특히 그것이 최초로 출현할 당시 어떠한 정치적 행위나 태도 또는 정책이나 이념을 지칭하거나 분석하는 용어로 사용되기 시작했는지 그 연구의 역사에 대한 개관이다. 둘째, 파퓰리즘이란 용어의 어원인 ‘populus’란 말에 함축된 정치사 및 정치사상사적 의미에 대해 설명이다. 셋째, 그러한 개관과 설명을 기초로 한국정치에서 파퓰리즘을 극복할 방안을 모색하게 될 것이다. Populism has become a central word in the current political rhetoric of Korea. The word, which was initially used in Korean politics by the conservative political camp to denounce the policies of Kim Dae-Jung’s administration, has now become a rhetorical weapon for politicians of any persuasions or propensities to attack their political opponents. Despite the fact, it appears that the meaning or the ideological character of populism has not yet been sufficiently explored in Korean political science. This article is an inquiry in political philosophy intended to address the unresolved problem. It makes three attempts for the purpose. First, it investigates the etymological origin of the word populism which is a foreign term imported from the western scholarship; a brief historical survey of how the word was originally coined as a concept for designating or analyzing political actions or attitudes, policies or ideas will be presented. Second, the meaning of the Latin word ‘populus’ in the context of political history as well as of the history of political thought will be explored. Third, on the basis of the preceding discussions some suggestions for the overcoming of populism in Korean politics will be made.

레이저 추적 시스템의 최적화 설계 기법

이승태(SeungTae Lee),정보희(BoHee Jung),양성혁(Seonghyuk Yang),공현배(Hyun Bae Kong),송남훈(Nam Hun Song),김덕래(Duck-Lae Kim) 대한전자공학회 2019 전자공학회논문지 Vol.56 No.1

본 논문에서는 레이저 추적 시스템을 구현할 때 적용할 수 있는 최적 설계 기법을 제시하였다. 레이저 추적 시스템 설계 시설계자는 해당 장비의 요구사항을 만족하는 시스템의 세부 구성품을 선정해야한다. 구성품 선정 결과에 따라서 구현된 시스템 성능은 요구 성능을 충족시키지 못하거나 요구 성능 이상의 과다 설계가 이루어 질 수 있다. 최적의 구성품 선정은 시스템의 성능 및 가격을 결정하는 중요한 요소이다. 본 연구에서는 과다 설계로 인한 비용 상승을 회피할 수 있는 최적의 설계 기법을 제시하기 위하여 레이저 추적기를 구성하였고, 이 장치를 사용하여 세부 구성의 변경에 따른 전체 시스템 성능 자료를 획득하였다. 획득된 자료를 기반으로 레이저 추적기 성능을 분석하고 성능 모델을 선정하고 레이저 추적기 시스템 설계 최적화 기법을 도출하였다. 설계 최적화 기법에 적용되는 변수로 ADC sampling 주파수와 입력 파형 펄스폭을 사용하였다. 수식을 도출하기 위해 2개의 변수에 회귀분석을 적용하였다. 그 결과로 식(5)를 통해 시스템의 출력각도오차를 추정할 수 있었다. In the paper, wants to suggest optimizing technique for laser spot tracker system design. when engineer design consist of laser spot tracker system, have to choices detail components of system. In this process, If designer perform the wrong design, then System performance may be lower or excessive then required system performance. This is one of importance point to be decided the price of system. Therefore, In this sturdy, we made the laser spot tracker to suggest optimizing technique for avoiding risk, we repeatedly tested it under various conditions for testing and acquired the performance data of laser system, using this laser spot tracker system. and we select the laser spot tracker model base on analyzing acquired data. Through this process, the optimizing technique for laser spot tracker system design was derived. ADC sampling frequency and pulse width of input waveform were used as variables to be applied to Optimizing technique of System Design. Two variables were regression analyzed to derive the equation. As a result, the output angle error of the system can be estimated through Equation (5).

Effects of Vertical Alignment of Leg on the Knee Trajectory and Pedal Force during Pedaling

Kim, Daehyeok,Seo, Jeongwoo,Yang, Seungtae,Kang, DongWon,Choi, Jinseung,Kim, Jinhyun,Tack, Gyerae Korean Society of Sport Biomechanics 2016 한국운동역학회지 Vol.26 No.3

Objective: This study evaluated the vertical and horizontal forces in the frontal plane acting on a pedal due to the vertical alignment of the lower limbs. Method: Seven male subjects (age: $25.3{\pm} 0.8years$, height: $175.4{\pm}4.7cm$, weight: $74.7{\pm}14.2kg$, foot size: $262.9{\pm}7.6mm$) participated in two 2-minute cycle pedaling tests, with the same load and cadence (60 revolutions per minute) across all subjects. The subject's saddle height was determined by the height when the knee was at $25^{\circ}$ flexion when the pedal crank was at the 6 o'clock position (knee angle method). The horizontal force acting on the pedal, vertical force acting on the pedal in the frontal plane, ratio of the two forces, and knee range of motion in the frontal plane were calculated for four pedaling phases (phase 1: $330{\sim}30^{\circ}$, phase 2: $30{\sim}150^{\circ}$, phase 3: $150{\sim}210^{\circ}$, phase 4: $210{\sim}330^{\circ}$) and the complete pedaling cycle. Results: The range of motion of the knee in the frontal plane was decreased, and the ratio of vertical force to horizontal force and overall pedal force in the complete cycle were increased after vertical alignment. Conclusion: The ratio of vertical force to horizontal force in the frontal plane may be used as an injury prevention index of the lower limb.

교통수단간 연계를 위한 최적 버스 배차간격 조정 알고리즘 개발

유병용(Ryu Byoungyong),양승태(Yang Seungtae),배상훈(Bae Sanghoon) 대한토목학회 2009 대한토목학회논문집 D Vol.29 No.1D

현대사회는 차량의 급격한 증가로 인해 교통정체, 환경오염이 심각해지고 있으며, 유가의 상승으로 인해 대중교통이용의 필요성이 대두되고 있다. 특히 장거리를 이동하는 이용자는 대중교통의 환승이 중요한 요인이라 할 수 있다. 이러한 연계성을 확보하기 위하여 국내에서는 환승센터의 구축이 활발하게 이루어지고 있다. 하지만 이러한 환승센터의 구축뿐만 아니라 교통수단간 효율적인 연계체계를 구축하여 이용자의 대기시간을 최소화하는 방안 마련을 통해 대중교통의 만족도를 향상시켜 승용차에서 대중교통으로의 수단전환이 필요하다고 할 수 있다. 따라서 본 연구는 대중교통수단간 환승 시 효율적인 연계버스 운행간격의 조정을 통하여 환승승객의 대기시간을 최소화하는 알고리즘의 개발을 목적으로 한다. 운행간격 조정을 위하여 일반승객의 대기시간비용, 환승승객의 대기시간비용, 버스운행비용 등 총 교통비용을 산정하여 이를 최소화하는 배차간격을 산출한다. 모형의 검증을 위하여 광명역을 대상으로 KTX와 광명역을 기점으로 하는 6014번 노선을 선정하여 모형을 적용하였다. 적용결과 현행으로 운행 시 270분 대기시간이 발생하며, 개선된 모형을 적용하게 되면 승객수요에 따른 시나리오에 따라 58분에서 82분의 대기시간이 발생하는 하여 최대 212분의 단축 효과가 있는 것으로 나타나 모형의 효과가 높은 것으로 판단된다. Due to the rapid increase of vehicles on the street, Korean society is facing worsening traffic congestions and air pollutions. Also, the oil price pickup has led to increasing need for the use of public transportation. In particular, transfering among public transportation may be a main factor for riders who are commuting for a long distance journey. In order to ensure such connectivity, transfer stations have been actively built in Korea. However, it would be necessary to shift those vehicles, from cars to public transportations by enhancing the users' satisfaction with public transportation through strategies for minimizing the users' waiting cost by building an efficient connective system between transportation modes as well as the preparation of aforementioned transfer stations. Therefore, this study aimed to develop an algorithm for minimizing transferring passengers' waiting costs based on service intervals of linked buses within the transfer facilities. In order to adjust the service interval, we calculated the total costs, involving the wait cost of transfer passengers and bus operation costs, and produced an allocation interval, that would minimize the costs. We selected a KTX departing from Seoul station, and a No. 6014 bus route in Gwangmyeong city where it starts from the Gwangmyeong station in order to for verifying the model. Then, the transfer passengers' total waitting cost was reduced equivalent to the maximum of 212 minutes, and it revealed that the model performed very effectively.

A Decision Model for Selecting Suitable Shelters using GIS-based Proximity

Daniel Niko,Hyunsuk Hwang,SeungTae Yang,KyuBark Shim,Changsoo Kim 한국정보통신학회 2011 2016 INTERNATIONAL CONFERENCE Vol.4 No.1

Replication and Pathogenesis of the Pandemic (H1N1) 2009 Influenza Virus in Mammalian Models

권동혁,Kyeongcheol Shin,Seungtae Kim,하윤철,Jang-Hoon Choi,Jeong Seon Yang,Joo-Yeon Lee,채찬희,Hee-Bok Oh,Chun Kang 한국미생물학회 2010 The journal of microbiology Vol.48 No.5

This study aimed to characterize the replication and pathogenic properties of a Korean pandemic (H1N1) 2009 influenza virus isolate in ferrets and mice. Ferrets infected with A/Korea/01/2009 (H1N1) virus showed mild clinical signs. The virus replicated well in lungs and slightly in brains with no replication in any other organs. Severe bronchopneumonia and thickening of alveolar walls were detected in the lungs. Viral antigens were detected in the bronchiolar epithelial cells, in peribronchial glands with severe peribronchitis and in cells present in the alveoli. A/Korea/01/2009 (H1N1) virus-infected mice showed weight loss and pathological lung lesions including perivascular cuffing, interstitial pneumonia and alveolitis. The virus replicated highly in the lungs and slightly in the nasal tissues. Viral antigens were detected in bronchiolar epithelial cells, pneumocytes and interstitial macrophages. However, seasonal H1N1 influenza virus did not replicate in the lungs of ferrets, and viral antigens were not detected. Thus, this Korean pandemic (H1N1) 2009 isolate infected the lungs of ferrets and mice successfully and caused more pathological lesions than did the seasonal influenza virus.

Effects of Vertical Alignment of Leg on the Knee Trajectory and Pedal Force during Pedaling

( Daehyeok Kim ),( Jeongwoo Seo ),( Seungtae Yang ),( Dongwon Kang ),( Jinseung Choi ),( Jinhyun Kim ),( Gyerae Tack ) 한국운동역학회 2016 한국운동역학회지 Vol.26 No.3

Objective: This study evaluated the vertical and horizontal forces in the frontal plane acting on a pedal due to the vertical alignment of the lower limbs. Method: Seven male subjects (age: 25.3 ± 0.8 years, height: 175.4 ± 4.7 cm, weight: 74.7 ± 14.2 kg, foot size: 262.9 ± 7.6 mm) participated in two 2-minute cycle pedaling tests, with the same load and cadence (60 revolutions per minute) across all subjects. The subject``s saddle height was determined by the height when the knee was at 25° flexion when the pedal crank was at the 6 o``clock position (knee angle method). The horizontal force acting on the pedal, vertical force acting on the pedal in the frontal plane, ratio of the two forces, and knee range of motion in the frontal plane were calculated for four pedaling phases (phase 1: 330~30°, phase 2: 30~150°, phase 3: 150~210°, phase 4: 210~330°) and the complete pedaling cycle. Results: The range of motion of the knee in the frontal plane was decreased, and the ratio of vertical force to horizontal force and overall pedal force in the complete cycle were increased after vertical alignment. Conclusion: The ratio of vertical force to horizontal force in the frontal plane may be used as an injury prevention index of the lower limb.

Dual Pulley Drive: Single actuator system with adjustable profile overlapping range in 2-DOF assistance for exosuits

Jaewook Ryu(류재욱),Seungtae Yang(양승태),Giuk Lee(이기욱) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.4