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- 저자 : 이은수(Lee, Eun Soo) (검색결과 232 건)
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고굴절률 불화폴리이미드를 이용한 광도파로 위상변조기 제작 및 특성 분석
이은수,천권욱,진진웅,오민철,Lee, Eun-Su,Chun, Kwon-Wook,Jin, Jinung,Oh, Min-Cheol 한국광학회 2021 한국광학회지 Vol.32 No.4
Fluorinated polyimide has excellent light transmittance and a high optical refractive index, and is useful for producing optical-waveguide phase modulators with low optical loss and low electric power consumption. In this work, an optical-waveguide phase modulator is designed and fabricated based on a high-refractive-index fluorinated polyimide, and its characteristics are measured. An efficient protocol for characterizing the loss components of the optical waveguide is proposed, and the propagation loss of the fabricated polyimide optical waveguide is confirmed to be 0.9 dB/cm. The phase modulator requires 9.1 mW of power for phase change of π, and the response time is 290 μs, which is improved by tenfold compared to a previous demonstration of polymeric phase modulators. 불화폴리이미드는 우수한 광투과율과 광학적 굴절률이 높은 특징을 가지며 이를 이용하여 제작된 폴리머 광도파로 위상변조기는 광손실이 작고 저전력으로 안정적인 위상제어가 가능하게 된다. 본 논문에서는 고굴절률 불화폴리이미드를 이용하여 광도파로 위상변조기를 설계하고 제작하여 특성을 분석하였다. 광도파로를 제작하여 손실을 측정하기에 효율적인 새로운 방법을 제시하였고, 제작된 폴리이미드 광도파로의 전파손실은 0.9 dB/cm로 확인되었다. 위상변조기는 π 위상변화를 위해 9.1 mW의 전력을 필요로 하였으며, 기존 폴리머 위상변조기 대비 응답속도가 10배 정도 향상된 290 μs 정도의 응답시간을 가지는 것을 확인하였다.
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전담간호사의 역할갈등과 전문직 자아개념이 직무만족에 미치는 영향
이은수,김세영,Lee, Eun Su,Kim, Se Young 한국직업건강간호학회 2022 한국직업건강간호학회지 Vol.31 No.4
Purpose: This study is investigate the role conflict, professional self-concept, and job satisfaction degree of the physician assistant nurses, and to grasp the factors affecting job satisfaction. Methods: Data were collected from September to October, 2018 and 156 physician assistant nurses working at one certified tertiary hospital, four general hospitals, using self-report questionnaires. Data were analyzed using descriptive statistics, t-test, ANOVA, Scheffe's test, Pearson's correlation coefficient and stepwise multiple regression. Results: The degree of job satisfaction of the subject was 2.76 out of 5. The influential factors in the job satisfaction of the subjects were professional self-concept (β=.51, p<.001), and role conflict (β=-.29, p<.001), affected job satisfaction by 53.5%. Conclusion: In order to improve the job satisfaction of physician assistant nurses, the role conflict should be solved and a plan to form a positive self-concept should be sought. Therefore, through the identification of the roles that are appropriate to the situation in Korea and the legal and institutional positioning, they will need to be recognized and developed.
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이은수,신진,Lee, Eunsu,Shin, Jin 한국해양전략연구소 2022 해양안보 Vol.5 No.1
China has been pushing for a systematic strategy for territorialization over a long period of time to invade Korea's West Sea (Yellow Sea) in order to create China's territorial water. China's strategy for territorializing the West Sea is an activity in which China curbs the use of South Korea and enforces the illegal use of China in order to dominate the West Sea exclusively. China aided Chinese fishing boats that engaged in illegal fishing in Korea's jurisdiction as a means to territorialize the West Sea, and is opposed to combined exercise and training of Korea and the United States Naval Forces in the West Sea, while intentionally entering KADIZ(Korea Air Defense Identification Zone). In addition, Beijing used 'scientific exploration and research' measures as a pretext for its strategies in order to encroach on Korea's West Sea. China is carrying out such work to announce to the world that China is a systematic and organized country while consistently attempting to dominate the West Sea. China's activities in the West Sea seriously infringe South Korea's sovereignty. In order to respond to China's strategies of territorialization in the West Sea stated above, I analyzed the rejection effect of the ROK-US combined military training in the West Sea and presented a 'proportional response strategy centered on the ROK-US combined forces'. Korea should be able to respond proportionally to China's activities in the seas around the Korean peninsula, and Korea should be able to neutralize China's attempt to a Fait Accompli. In addition, just as China installs buoys in the Korea-China Provisional Measures Zone, Korea should be able to install and actively utilize some devices in the West Sea and for the use of free and open West Sea. Korea should not just wait for the tragic future to come without preparing for China's gradual and long-term strategy, and Seoul needs to respond to China's maritime policy in the West Sea with a more active attitude than it is now. China has historically taken a bold and aggressive response to neighboring countries that are consistent with a passive attitude, on the other hand, Beijing has taken a cautious approach to neighboring countries that respond with an active attitude. It should not be forgotten that Korea's passive response to the Chinese strategy in the name of a 'realistic approach' such as Korea's economic dependence on China for economy will result in China's success for territorialization of the West Sea.
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이은수,신진,Lee, Eunsu,Shin, Jin 한국해양전략연구소 2023 해양안보 Vol.7 No.1
본 논문은 북한의 SLBM 탑재 신형 잠수함과 핵 무인 수중 공격정 '해일'에 효과적으로 대응하기 위해 자항 기뢰와 초공동 어뢰를 결합한 융복합 무기체계를 제안하고, 그 효과성을 분석하였다. 자항 기뢰와 초공동 어뢰의 융복합 무기체계는 자항 기뢰의 은밀 매복 및 탐지 능력과 초공동 어뢰의 초고속 주행 능력을 결합하여, 각 무기체계의 장점을 극대화하고 단점을 상호 보완한다. 이 무기체계의 효과성을 분석하기 위해 국방전력발전업무훈령의 소요제기서 작성 기준을 참고하여 수중 유도무기의 작전 운용에 요구되는 성능에 적합하게 분석 기준을 선정하고, 기존 무기체계 대비 효과성을 수중 방어 지속성, 전투력 운용 융통성, 생존성, 지휘/통제, 운영 비용 효율성, 기상 영향 요인 등 6가지 측면에서 분석하였다. 또한, 시나리오 구상을 통해 이 무기체계의 실용성을 입증하였다. 자항 기뢰와 초공동 어뢰의 융복합 무기체계가 현실화 된다면 미래의 수중환경에서 한국의 안보에 매우 중요한 역할을 할 수 있을 것으로 기대된다. This study proposes a new convergence weapon system that combines the covert placement and detection abilities of a self-propelled mobile mine with the rapid tracking and attack abilities of supercavitating rocket torpedoes. This innovative system has been designed to counter North Korea's new underwater weapon, 'Haeil'. The concept behind this convergence weapon system is to maximize the strengths and minimize the weaknesses of each weapon type. Self-propelled mobile mines, typically placed discreetly on the seabed or in the water, are designed to explode when a vessel or submarine passes near them. They are generally used to defend or control specific areas, like traditional sea mines, and can effectively limit enemy movement and guide them in a desired direction. The advantage that self-propelled mines have over traditional sea mines is their ability to move independently, ensuring the survivability of the platform responsible for placing the sea mines. This allows the mines to be discreetly placed even deeper into enemy lines, significantly reducing the time and cost of mine placement while ensuring the safety of the deployed platforms. However, to cause substantial damage to a target, the mine needs to detonate when the target is very close - typically within a few yards. This makes the timing of the explosion crucial. On the other hand, supercavitating rocket torpedoes are capable of traveling at groundbreaking speeds, many times faster than conventional torpedoes. This rapid movement leaves little room for the target to evade, a significant advantage. However, this comes with notable drawbacks - short range, high noise levels, and guidance issues. The high noise levels and short range is a serious disadvantage that can expose the platform that launched the torpedo. This research proposes the use of a convergence weapon system that leverages the strengths of both weapons while compensating for their weaknesses. This strategy can overcome the limitations of traditional underwater kill-chains, offering swift and precise responses. By adapting the weapon acquisition criteria from the Defense force development Service Order, the effectiveness of the proposed system was independently analyzed and proven in terms of underwater defense sustainability, survivability, and cost-efficiency. Furthermore, the utility of this system was demonstrated through simulated scenarios, revealing its potential to play a critical role in future underwater kill-chain scenarios. However, realizing this system presents significant technical challenges and requires further research.
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이은수(Lee, Eun Soo),이우상(Lee, Woo Sang),이상헌(Lee, Sang Hyun),박기태(Park, Ki-Tae) 한국지적정보학회 2011 한국지적정보학회지 Vol.13 No.2
본 연구는 관성측정장치를 이용하여 지하시설물측량을 수행할 수 있는지에 대한 가능성을 분석하는 것을 목적으로 한다. 이를 위하여 MTi-G 센서와 R1001E 센서를 이용하여 각각의 측량 시스템을 구축하였다. 구축된 시스템을 이용하여 약 50여 미터에 이르는 PVC 관의 위치정보를 취득하였으며, 지상 기지값을 이용하여 보정하였다. MTi-G 시스템으로 취득한 위치정보의 수평 및 수직위치 최대편차는 각각 약 0.20m, 약 0.07m였다. R1001E 시스템으로 취득한 위치정보의 수평 및 수직위치 최대편차는 약 1.05m, 약 0.12m였다. 지하시설물 측량의 수평 위치 허용범위 ±0.20m. 수직 위치 허용범위 ±0.30m를 고려할 때. MTi-G 센서를 이용한 시스템은 지하시설물측량에 활용할 수 있을 것으로 판단된다. This paper aimed at finding out whether or not IMU system could be used for underground facility surveying. Each system was constructed with the MTi-G sensor and the R1001E sensor. Position data of about 50m pipeline was obtaied with these system and corrected using the ground control points. The maximum horizontal and vertical deviation of position data obtained with the MTi-G system are about 0.20m, 0.07m respectably. The maximum horizontal and vertical deviation of position data obtained with the R1001E system are about 1.05m, 0.12m respectably. it is considered that the Mti-G system could be used in underground facility surveying because the horizontal position limit of underground facility surveying is ±0.20m and the vertical position limit of that is ±0.30m.
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