• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2006.06b
• /
• pp.5-11
• /
• 2006

Urinalyses have been conducted for 28 seamen in K University's training ship and Creatine and Uric acid turned out to be higher in all ages, which can be inferred that on-deck environment has caused negative impact on kidney and/or malfunction. In addition, TC arid HDL-C, LDL-C has decreased, however, TG has increased after the navigation. All different positions including oater, crew, decker, engineer and radio part showed the similar pattern. TC and HDL-C has decreased in 30s, 40s and TG has increased in 30s. A few of the 30's show extremely high TG rates so Hyperlipidemia is suspected. 7 members fumed out positive for UBG test and 5 positive for PRO test. Especially there was only one UBG positive before the navigation but, 7 members has become positive, which means the one-month ocean navigation has definite impact on the liver cell function.

• Korean Journal of Remote Sensing
• /
• v.15 no.2
• /
• pp.175-181
• /
• 1999

A recurring eddy which located at the terminal end of the Korean East Warm Current was captured on ocean color and sea surface temperature imagery from satellite in spring and autumn. During late April, 1997 thermal infrared imagery from the NOAA AVHRR sensor and ocean color data from the Japanese ADEOS-I OCTS sensor, revealed this feature. The cold core had elevated chlorophyll concentrations, based on OCTS estimates, of greater than 3 mg/m$^3$ while the warmer surrounding waters had chlorophyll concentrations of 1 mg/m$^3$ or less. The elevated cholophyll accociated with this eddy has not been previously described. The eddy is also evident in SST images from autumn, but the SST in the core is warmer than in spring, and the warm jet flowing to the west of the eddy is also warmer is autumn compared to spring. A reccurring eddy and the high chlorophyll_a concentration area which surround around the eddy show on NOAA and SeaWiFS images in March 2, 1998. The eddy forms at the northern extent of the Korean East Warm Current as those waters collide with the cold, south-flowing Liman Current over a topographic shelf about 1500 m deep. This region of the eddy formation appears to have a strong connection with the dynamics of the western part of the polar front eddy field that dominates surface mesoscale structure in the central East (Japan) Sea. Interaction of the eddy with ARGOW tracked drifters, and evidence for its persistence are discussed.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2015.05a
• /
• pp.336-336
• /
• 2015

일반적인 다목적댐은 홍수 발생 시 본댐으로 유입되는 부유쓰레기 및 잡목 등을 차단하기 위하여 댐 상류에 차단망을 설치하여 1차적으로 사전 방지하고, 홍수기 이후 선박으로 부유물을 수거하여 재활용, 소각 등으로 처리하는 시스템이다. 그러나 본 연구의 대상인 한탄강댐은 홍수조절용 댐으로서 수위 변화 폭이 매우 크고 정상 조건(비 홍수기)시는 대규모 홍수터가 드러나기 때문에 댐 유지관리 방법이 상이하며 한탄강 본류 구간은 하폭과 수심 등 하도의 불규칙성과 만곡부에서 유수의 흐름이 한쪽으로 쏠리는 편기 현상이 발생하는 등 복잡한 수리현상으로 인하여 부유쓰레기의 분포를 판단하기 어려운 지역이다. 따라서 본 연구에서는 부유쓰레기의 유동을 모의하기 위하여 HEC-HMS 모형과 $Vflo^{TM}$ 모형을 활용하여 본류와 지류의 빈도별 홍수량 분석을 실시하고, EFDC 3차원 동수역학 모형을 적용하여 홍수조절용지 내 부유쓰레기의 유입 경로 및 정체 구역을 분석하여 효과적인 쓰레기 처리 방안을 제시하고자 하였다. 분석 결과, 소규모 빈도 홍수(2년, 5년)의 경우 중 상류 지류의 부유쓰레기는 거의 유동하지 못하고 하도의 만곡의 영향을 받아 부분적으로 높은 밀도로 고착될 것으로 모의되며, 특히 본류와의 합류점 부근에 도달한 부유쓰레기는 유로 폭이 급확대되어 유속이 거의 없는 사수역 구간으로 변함에 따라 본류 배수위 영향으로 불규칙하게 맴돌다가 고착되는 것으로 모의되었다. 중규모 홍수(25년, 50년)의 경우, 상류부의 부유쓰레기의 분포는 소규모 홍수 시와 유사한 패턴을 보였으나 중류부에서 홍수파가 본류 하도를 월류하여 홍수터로 넓게 범람하는 지역에서는 소규모 홍수 시 본류 하도 양안에 분포하던 부유쓰레기가 홍수터 쪽으로 밀려가서 고착되는 경향을 보였다. 대규모 홍수(100년, 200년)의 경우, 댐과 인접한 분석 구간 하류부는 댐 배수위의 영향을 가장 크게 받으며 수심이 깊어 흐름이 가장 정체되는 구간으로 본류와 지류 모두 다량의 부유쓰레기가 분포할 것으로 분석되었다. 분석 구간 중류부는 홍수 규모가 증가함에 따라 넓은 홍수터로 침수범위가 급격하게 증가하며 이에 따라 부유쓰레기가 분포할 수 있는 면적이 크게 증가할 것으로 분석되었다. 또한 분석 구간 상류부는 협곡을 이루고 있어 홍수규모가 증가하더라도 침수범위와 부유쓰레기의 분포면적에 큰 변화가 없을 것으로 분석되었다. 본 연구 결과를 바탕으로 댐의 치수 문제가 발생하지 않도록 효과적으로 수거 처리 할 수 있는 부유쓰레기 적치장 및 차단 시설의 적정 설치 위치를 파악하였다.

• Convergence Security Journal
• /
• v.21 no.1
• /
• pp.191-200
• /
• 2021

Artificial intelligence technology is developing in an environment where a lot of data is produced due to the development of computing technology, a cloud environment that can store data, and the spread of personal mobile phones. Among these artificial intelligence technologies, the deep neural network provides excellent performance in image recognition and image classification. There have been many studies on image detection for forest fires and fire prevention using such a deep neural network, but studies on detection of cigarette smoking were insufficient. Meanwhile, military units are establishing surveillance systems for various facilities through CCTV, and it is necessary to detect smoking near ammunition stores or non-smoking areas to prevent fires and explosions. In this paper, by reflecting experimentally optimized numerical values such as activation function and learning rate, we did the detection of smoking pictures and non-smoking pictures in two cases. As experimental data, data was constructed by crawling using pictures of smoking and non-smoking published on the Internet, and a machine learning library was used. As a result of the experiment, when the learning rate is 0.004 and the optimization algorithm Adam is used, it can be seen that the accuracy of 93% and F1-score of 94% are obtained.

• Journal of the Korean Geotechnical Society
• /
• v.37 no.12
• /
• pp.57-71
• /
• 2021

The pile-supported wharf is the port structure in which the upper deck is supported by piles or columns. By installing batter piles in this structure, horizontal load such as earthquake loads can be partially delivered as axial forces. The codes suggests using the response spectrum analysis as a preliminary design method for seismic design of pile-supported wharf, and suggests modeling the piles using virtual fixed points or soil spring methods for this analysis. Recently, several studies have been conducted on pile-supported wharves composed of vertical piles to derive a modeling method that appropriately simulates the dynamic response of structures during response spectrum analysis. However, studies related to the response spectrum analysis of pile-supported wharves with batter piles are insufficient so far. Therefore, this study performed the dynamic centrifuge model test and response spectrum analysis to evaluate the seismic performance according to the modeling method of pile-supported wharves with batter piles. As a result of test and analysis, it is confirmed that modeling using the Terzaghi (1955) constant of horizontal subgrade reaction (n_h) most appropriately simulates the actual response in the case of the pile-supported wharf with batter piles.

• International Area Studies Review
• /
• v.20 no.1
• /
• pp.277-295
• /
• 2016

It is undoubtedly true that national security in Korean peninsula is on the road to destabilization. The main factors are known to be North Korea's development and experiment on nuclear arms, especially the forth nuclear experiment on January 6th, ICBM launch February 7th, and encroachment upon the territory the NLL on the 8th along with the shutdown on Gaeseong Industrial Complex. Also, China's trouble with other nations over sovereignty over islands in the South China Sea and the fact that Japan's government is veering to the right side and having territorial dispute are making the case worse. Nations in Northeast Asia are striving to obtain the interest for the sake of their own country. In order to do so, they're walking the path to achieve national security. Until then, they are not so willing to participate foreign matters or economical race. Even in our perspective, these issues are many of the main problems which our country is currently facing. However, it is important for them to avoid making policies which may take away the citizen's happiness. The number one priority for the nation or any form of a group is to act in the best interest for the national security and the citizen's happiness. They are the main factors why a nation could exist. They are the symbols of a nation's sovereign authority. Countries outside are proving it by increasing their national defense budget even in this unprecedented economical crisis. If we are willing to stay the same as ever, the disparity in the military force will not be the same in the future. In conclusion, the study examines the problem which changes in Northeast Asia's defense environment could bring and the appropriate amount of national defense budget in order to support the nation's integration of its abilities to move toward South and North Korea's unification.

• Korean Journal of Heritage: History & Science
• /
• v.44 no.4
• /
• pp.70-85
• /
• 2011

The study of the modern art market and distribution differs in its research focus from that of traditional art history, which traces and analyzes the works of master artists, their schools and influence, in that it attempts to approach such issues as art and society, and distribution and consumption of works of art, based on new research methods and perspectives. This paper examines the life and art collection activities of Park Yeong-cheol, considered to be one of the earliest major modern Korean art collectors. He graduated from the Japanese military academy and served as both a solider of the Greater Korean Empire and a high level officer of the Japanese army. After being discharged, he served as Governor of Gangwon-do and then Hamgyeongbuk-do, and after his retirement from public office, he became a leading businessman. He is well-known as a Japanese sympathizer who approved of and advocated for the aggressive colonial policies of the Japanese empire. As a cultural enthusiast and art collector, however, Park Yeong-cheol published the most accurate edition of Yeonamjip, and donated his collection to Geyongseong University at the end of his life, thus providing the foundation for the Seoul National University Museum. All of these activities are highly commendable. His interest in growing his collection of paintings and calligraphies was largely motivated by his love of paintings and Chinese poems,but it also appears to have been the result of his active collaboration with the Japanese government's policy of trying to discover the distinct, non-western characteristics of traditional Eastern art.

• Convergence Security Journal
• /
• v.17 no.5
• /
• pp.143-151
• /
• 2017

The purpose of this study is to provide the future development of the PRC Marine Corps by analyzing the changing functions via its historical development. The PRCMC is an elite regular military forces and was established by the Central Military Commission(China) in 1953 in order to project the national military power toward the enemy's territory by overcoming maritime obstacles such as seas and lakes. The PRCMC is relatively smaller personnel strength compared with the whole size of the PRC military forces. Thus its functions were limited in the areas of amphibious and land operations, island and land defense against Taiwan before the PRC pursues expanding policy toward outside. However, in the 2000s, China pursues its policy for obtaining absolute national interest so that its functions are rapidly enlarged into defense of the forward naval bases, and those for evolving its power toward outside according to not only the island territorial dispute with Japan, but also Xi Jinping's active expanding policy what we call 'the one belt and one road'. So its personnel strength is slowly increased. If the increasement of the PRC Navy and Marine Corps would develop into the level of which they can contain the status and influence of the US military power in Asia-Pacific area, it is possible that the security environment of the North-east Asia including the Korean peninsula will be fluctuated. Consequently, the ROK also needs to reevaluate the functions and the size of the joint strength of the ROK Navy and Marine Corps considering the transition of the changing security environment.

• The Journal of the Acoustical Society of Korea
• /
• v.38 no.1
• /
• pp.56-65
• /
• 2019

The Indo-Pacific bottlenose dolphins (Tursiops aduncus) are a toothed whale using echolocation clicks and have been studied continuously abroad. However, most studies on this whale's clicks were performed about captive animals and, in Korea, only the studies of the whistle sounds of this animal were done. In this paper, acoustic characteristics of clicks were analyzed about the free-ranging Indo-Pacific bottlenose dolphins living in the coast of the Jeju Island. Acoustic parameters such as signal duration, 1st and 2nd peak frequency, 3 dB and 10 dB bandwidth for acoustic characteristics were calculated and compared with those of Australian species. As a result, the signal durations had average of $38{\mu}s$ and most clicks were within range of $20{\mu}s-60{\mu}s$. The two types of bandwidths showed both narrowband and broadband characteristics, and bimodal signal characteristics were confirmed through the 1st peak frequencies(average of $96kHz{\pm}18kHz$) and the 2nd peak frequencies(average of $69kHz{\pm}19kHz$).

• Korean Journal of Heritage: History & Science
• /
• v.54 no.3
• /
• pp.204-227
• /
• 2021

This paper proposed the validity and necessity of establishing the Jungwon Historical and Cultural Area by reviewing the historical characteristics of the name Jungwon and its temporal and spatial range. We also explored ways to utilize the Jungwon historical and cultural Area under the Special Act on the Maintenance of Historical and Cultural Areas. Jungwon, which means the center of the country, has strategic value as a key area connecting the Korean Peninsula to the north and south through the Geripryeong and Jukryeong. It also includes Chungju, which connects the Namhan and Bukhan Rivers . From the Mahan period, the areas of Cheongju and Jincheon, the Miho Stream basin to the west, and Chungju to the east were closely connected to each other. Afterwards, Baekje, Koguryo, and Silla engaged in a fierce battle to occupy the Jungwon area. Jungwon culture was born through the negotiation and fusion of the cultures of the three kingdoms. In particular, Silla continued to value the Jungwon area, demonstrated by the installation of Seowongyeong in Cheongju and Bukwongyeong in Wonju, centering on the Jungwongyeong. Since we have a historical view with a focus on ancient kingdoms, we have overlooked the full value of the history and culture of Jungwon. We need to recognize the importance of Jungwon area and think about how to utilize it. Therefore, we suggested in this paper that there be more public information services on the cultural heritage of Jungwon, the historical heritage experience, and the education programs for local residents. The development and operation of Jungwon's history, culture, and tourism contents, as well as the various academic research papers should be used to reveal the identity of the Jungwon historical and cultural area.