남송(南宋) 륙유(陸游) 차자문(劄子文) 소고(小考) -「대걸분병취산동차자(代乞分兵取山東劄子)」와 「상이부론도읍차자(上二府論都邑劄子)」를 중심으로

이기훈 ( Lee¸ Kihoon ) 한국중국산문학회 2020 중국산문연구집간 Vol.10 No.-

In the text above, the definition of Zhaziwen, the characteristics of Zhaziwen in Southern Song Dynasty, and the stylistic features of Lu You Zhaziwen were discussed. Lu You, also known as a patriotic poet, is not the only expression of his ideas in poetry. His prose works, especially those of government officials, and his participation in various political issues, are more deeply imbued with his ideas. With this premise, I analyzed the Zhaziwen of his reading. First of all, through the two sentences covered in this book, the stylistic characteristics of the Zhaziwen text can be summarized in several ways: First, it is as formal as possible when posting to the emperor or superior. Second, let's look at the opponent's arguments first. Third, since it is an official document, the basis of logic is essential.

1970년대 전반 연세대학교 학생운동의 전개와 성격

이기훈 ( Lee¸ Ki Hoon ) 연세사학연구회 2021 學林 Vol.48 No.-

3선 개헌 이후 박정희 정권은 영구집권을 모색하며 사회적 저항을 약화시키는 것에 주력하고 있었다. 대학과 학생운동을 통제하기 위해 정권은 군사교육인 교련과목을 필수과목으로 지정하고 현역 군인을 교관으로 배치하는 방침을 발표했다. 학생운동은 민주화의 보루로서 학원의 자율성을 지키기 위해 교련반대 투쟁을 맹렬히 전개했다. 1970년 말부터 1971년 연세대 학생운동도 다른 대학 운동과 연대하여 대규모 집회와 시위, 단식농성을 전개하며 교련반대 운동을 전개하였으나, 정권이 위수령을 발동하여 대학을 휴교시키고 학생운동 주도자들을 강제 입영시키며 저항을 무산시켰다. 이후 1972년 10월 유신체제가 성립하자 학생운동은 각 대학을 연대하여 조직적인 반유신 운동을 시도하였는데, 1974년 민청학련이 대표적인 사례다. 연세대 학생들도 민청학련의 조직과 활동에 참여하다 구속되었다. 연세대학은 1974년 하반기부터 교수, 학생과 대학 당국이 모두 참여하는 대학 행정 개혁을 추진하여 성과를 거두었다. 이를 바탕으로 1975년 민청학련 사건 관련 교수 학생의 복직, 복교에 대한 정권의 탄압에 대해 대학 공동체가 함께 저항하는 면모를 보였다. 학원 자율성의 수호 이면에서는 학생운동의 새로운 이념과 지향이 성숙하고 있었다. 학생들은 자유민주주의의 실현에 그치지 않고 민주주의의 실현 주체로서 민족-민중을 발견했다. 이는 주체의 확장에 그치는 것이 아니라 현대 세계를 해석하는 시야의 확장이었고, 역사와 공간을 민중운동과 변혁의 시각에서 바라보는 것이었다. 여전히 실존적 지식인의 상을 지니고 있었지만, 이념적 측면에서 학생운동은 학원을 벗어나 민중을 바라보기 시작했다. Following the 1969 constitutional amendment that allowed a third term of presidency, the Park Chung-Hee administration cracked down on any civil resistance, so it could hold on to political power indefinitely. To suppress student movement and discipline universities, the Park administration ordered compulsory military training at all universities and planned to place military officers as teachers for the training. The students staged a severe protest against such a move, in order to guard the independence and freedom of university campuses as the last bastion of democracy. From the end of 1970 to 1971, student activists at Yonsei University formed a coalition with other universities and staged massive street rallies, demonstrations and hunger strikes to protest against forced military training on campus. The government, however, crushed all resistant attempts by issuing a garrison decree (a soft martial law), closing down universities and forcefully enlisting the student movement leaders to military service. When the Yushin Regime was established in October 1972, the student activists from different universities again formed a coalition and staged organized protests against the Yuhsin regime. The activity of the student organization National Democratic Youth-Student League (전국민주청년학생총연맹민청학련) is most representative. Many Yonsei University students also participated in its activities and were arrested. In the late half of 1974, Yonsei University conducted a major administrative reform, where faculty, student and university administration all participated, and achieve successful outcomes. This encouraged the university community to join forces and stand up against political oppression in the 1975 reinstatement of faculty and students who had to leave the school for their involvements in the National Democratic Youth-Student League incident. While guarding freedom on the university campus, student movement was also maturing in terms of its ideology and overall direction. The students went beyond striving for achieving liberal democracy;they discovered national identity and the people as an important player in realizing democracy. This implied more than just broadening the students’ understanding of the key players in the movement, but also of their whole viewpoint on modern history; the students came to see history and its physical space from the perspective of civil movement and revolution. While still portrayed as existential intellectuals, the student activists and their movement started to look beyond the university campus, to the outside world, and embrace the people in their ideological concepts.

Introduction to International Research Trends and Domestic Research Plans for Rotor Noise Reduction of Helicopter

Kihoon Chung 한국소음진동공학회 2010 한국소음진동공학회 세미나 Vol.2010 No.12

Numerical Investigation on a Rotor Tip-Vortex Instability in Very Low Advance Ratio Flight

Kihoon Chung,Changjeon Hwang,Duckjoo Lee,Jongbong Yim 한국항공우주학회 2005 International Journal of Aeronautical and Space Sc Vol.6 No.2

Helical tip vortex is known as stable vortex structure, however the specific frequency component of far wake perturbation induces the vortex pairing in hover and axial flight. It is expected that the tip vortex pairing phenomena may happen in transition flight and very low advance ratio flight so that inflow may be most nonuniform in the low advance ratio flight. The objectives of this paper are that a tip-vortex instability during the transition from hover into very low advance ratio forward flight is numerically predicted to understand a physics by using a time-marching free-wake method. To achieve the objectives, numerical method is firstly validated in typical axial and forward flights cases. Present scheme with trim routine can predict airloads and inflow distribution of forward flight with good accuracy. Then, the transition flight condition is calculated. The rotor used in this wake calculation is a small-scale AH-1G model. By using a tip-vortex trajectory tracking method, the tip-vortex pairing process are clearly observed in transient flight(μ=0.03) and disappears at a slightly higher advance ratio(μ=0.05). According to the steady flight simulation at μ=0.03, it is confirmed the tip-vortex pairing process is continued in the rear part of rotor disk and not occurs in the front part. Time averaged inflow in this case is predicted as smooth distribution.

Performance Analysis of the Anti-Spoofing Array Antenna with Eigenvector Nulling Algorithm

Kihoon Lee,Min Kyu Song,Jang Yong Lee 항법시스템학회 2022 Journal of Positioning, Navigation, and Timing Vol.11 No.3

The public open signals from Global Navigation Satellite System (GNSS) including Global positioning system (GPS) are used widely by many peoples in the world except for the public regulated restriction signals which are encrypted. Nowadays there are growing concerns about GNSS signal spoofing which can deceive the GNSS receivers by abusing these open services. To counter these spoofing threats, many researches have been studied including array antenna techniques which can detect the direction of arrival by means of Multiple Signal Classification (MUSIC) algorithm. Originally the array antenna techniques were developed to countermeasure the jamming signal in electronic warfare by using the nulling or beamforming algorithm toward a certain direction. In this paper, we study the anti-spoofing techniques using array antenna to overcome the jamming and spoofing issues simultaneously. First, we will present the theoretical analysis results of spoofing signal response of Minimum Variance Distortionless Response (MVDR) algorithm in array antenna. Then the eigenvector algorithm of covariance matrix is suggested and verified to work with the existing anti-jamming method. The modeling and simulation are used to verify the effectiveness of the anti-spoofing algorithm. Also, the field test results show that the array antenna system with the proposed algorithms can perform the anti-spoofing function. This anti-spoofing method using array antenna is very effective in the view point of solving both the jamming and spoofing problems using the same array antenna hardware.

A Local Channel Blacklisting Method Using Adaptive Channel-Quality Estimation in TSCH-Based Wireless Sensor Networks

Kihoon Jeon,Sanghwa Chung,Donghwa Yoo 한국정보과학회 2020 Journal of Computing Science and Engineering Vol.14 No.2

Owing to the development of the Internet of Things (IoT) paradigm, the energy consumption of devices and the reliability of communication have become important issues. Enhanced TSCH technology introduces a technique to select high-quality channels by using energy detection in the TSCH protocol to improve the reliability of communication in a dynamic environment where interference changes. However, it is difficult to apply ETSCH technology to a multi-hop network because the node that performs energy detection consumes more energy than the node that does not. In this article, we propose an adaptive channel-quality estimation (ACE), which flexibly adjusts the duty cycle of energy detection according to whether interference dynamically changes or not. ACEs are generally applicable regardless of the degree of change of interference, which improves energy efficiency. Also, we present ACE-blacklisting based TSCH (ACEBTSCH) that uses ACE and local channel blacklisting to blacklist the wireless channel based on energy detection in a multi-hop network. Experimental results show that ACEB-TSCH has a performance improvement of 15.94% over TSCH and 8.59% over PDR-blacklisting based TSCH.

Delay-dependent H<SUB>∞</SUB> control for linear systems with a time-delay and interval randomly varying disturbances

Kihoon Kim,Myeongjin Park,Ohmin Kwon 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10

This paper considers a delay-dependent H∞ problem for linear systems with a constant time-delay and interval randomly varying disturbances. It is assumed that the variance probability of disturbances satisfies the Bernoulli distribution. By constructing a suitable Lyapunov-Krasovskii functional, an H∞ control criterion for the system is proposed in terms of linear matrix inequalities (LMIs) which can be easily solvable by effective optimization algorithms. One numerical example is included to demonstrate the effectiveness of the presented criterion with designed controller.

Online Platform Competition with Asymmetric Revenue Structures

( Kihoon Kim ) 한국생산성학회 2018 生産性論集 Vol.32 No.1

A new online platform may only charge advertisers to compete with a leading incumbent one that collect fees from its users. When these two platforms compete with asymmetric revenue structures, the result of the competition can be different depending on several factors such as the degrees of users singlehoming, the potential market size, and the price-sensitivity of users charged by the incumbent. It is shown that unless all the users singlehome, the latecomer can overtake the incumbent when the potential market size is large or the price-sensitivity of the user group charged by the incumbent is high. This result is also consistent with the anecdotal evidences in China and the US to a degree. This study first shows that a potential market size can change the winner of the competition between an incumbent platform and a new one with asymmetric revenue structures. When one side tends to join the two platforms at a time, the latter can overtake the former if the market is not mature so that there is a room for its further growth. When Taobao started to compete with eBay China in 2003, the market itself was at an intial stage, so that Taobao could win over eBay China by not charging its sellers. On the other hand, Webstore, a free advertising-based online auction platform in the US, has been far behind eBay since its launch in 2008 was too late to change the winner of the competition. The users’ price-sensitivity also impacts the competition. Unless both buyers and sellers singlehome, if sellers are highly price-sensitive, the latecomer can win over the incumbent even when the potential market size is small. As Barnett et al. (2010) indicate, Chinese online auction sellers could have been unfamiliar with and averse to the idea of paying transaction fees. Unfortunately, eBay China adopted the policy of charging its sellers when it entered the market acquiring the leading local platform EachNet in 2003. Taobao, a small player at that time, did not impose any transaction fees on sellers and so could eventually attract more sellers than eBay China in a few years.

Fabrication of Electrospun PLGA and Small Intestine Submucosa-blended Nanofibrous Membranes for Tissue Engineering and their Biocompatibility

Kihoon KIM,Jong Yoon LEE,Young Tai YOO,Hwi-Yool KIM 한국고분자학회 2016 한국고분자학회 학술대회 연구논문 초록집 Vol.41 No.2

Behavior Based Decentralized Controller Design For Unmanned Aerial Vehicle Swarm

Kihoon Han,Jieun Lee,Youdan Kim 한국항공우주학회 2008 한국항공우주학회 학술발표회 논문집 Vol.- No.-

This paper deals with a behavior based decentralized control strategy for unmanned aerial vehicle (UAV) swarming. Individual interactions for swarming behavior are modeled using the artificial potential functions. For tracking the reference trajectory of UAV swarming, a swarming center is considered as the object of control. The sliding-mode control technique is used to make the proposed swarm control strategy robust with respect to the system uncertainties. Collision avoidance against obstacles and pop-up threats is also considered. Numerical simulations are performed to verify the performance of the proposed controller.