• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.341-342
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• 2001

이매패류의 아가미는 호흡기능과 함께 점액분비 및 섬모운동 등을 통하여 먹이의 포획, 수송, 소화 기능을 동시에 수행하며 (Beninger et al., 1988). 외부의 물리ㆍ화학적 자극에 빠르게 반응하는 중요한 외투강 기관계이다. 따라서 이매패류 아가미의 구조, 점액분비세포와 섬모운동의 특성은 서식생태와 섭이생태에 따라 다양하므로 이들 아가미에 관한 연구는 주로 다양한 측면의 환경변화 및 섭이생태와 연관하여 수행되어져 왔다. (중략)

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.381-384
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• 2011

본 논문은 사용자 및 동적환경의 변화를 파악하고 분석된 정보를 바탕으로 최적화된 경로를 제공하기 위한 시스템을 멀티에이전트를 이용하여 해결하고자 하였다. 멀티에이전트를 통해 설정된 목표를 찾아가는 먹이추적 문제에 적용하였고 현실 세계와 흡사한 무한 공간 환경에서 알고리즘의 성능을 실험하였다. 적용된 환경의 모델은 순환구조(circular)형 격자 공간이라는 새로운 실험 공간으로 방향 벡터 함수 알고리즘을 통해 새롭게 멀티에이전트의 목표를 획득하기 위한 해법이다. 기존의 연구와 비교하여 먹이의 효율적 포획, 에이전트간의 충돌문제 해결에 대한 새로운 해법을 제시할 수 있었다.

• Korean Journal of Mineralogy and Petrology
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• v.35 no.3
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• pp.273-281
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• 2022

Mantle heterogeneity is closely related to the distribution and circulation of volatile components in the Earth's interior, and the behavior of volatiles in the mantle strongly influences the rheological properties of silicate rocks. In mantle xenoliths, these physicochemical properties of the upper mantle can be recorded in the form of microstructures and fluid inclusions. In this paper, I summarized and reviewed the results of previous studies related to the characteristics of microstructures and fluid inclusions from peridotite xenoliths beneath the Rio Grande Rift (RGR) in order to understand the evolution and heterogeneity of upper mantle. In the RGR, the mantle peridotites are mainly reported in the rift axis (EB: Elephant Butte, KB: Kilbourne Hole) and rift flank (AD: Adam's Diggings) regions. In the case of the former (EB and KB peridotites), the type-A lattice preferred orientation (LPO), formed under low-stress and low-water content, was reported. In the case of the latter (AD peridotites), the type-C LPO, formed under low-stress and high-water content, was reported. In particular, in the case of AD peridotites, at least two fluid infiltration events, such as early (type-1: CO₂-N₂) and late (type-2: CO₂-H₂O), have been recorded in orthopyroxene. The upper mantle heterogeneity recorded by these microstructures and fluid inclusions is considered to be due to the interaction between the North American plate and the Farallon plate.

• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.428-430
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• 2001

다수의 자율이동로봇으로 구성되는 다개체 시스템에서의 협조행동을 위해서 각 개체는 주변환경의 인식뿐만 아니라 환경변화에 적응할 수 있는 추론능력이 요구된다. 이에 본 논문에서는 강화학습을 이용하여 동적으로 변화하는 환경 하에서 개체들이 스스로 학습하고 대처할 수 있는 협조행동 방법을 제시한다. 제안한 방법을 먹이와 포식자 문제에 적용하여 포식자 로봇간의 협조행동을 구현하였다. 여러 대로 구성된 포식자 로봇은 회피가 목적인 먹이로봇을 추적하여 포획하는 것이 임무이며 포식자 로봇들 간의 협조행동을 위해 각 상태에 따른 최적의 행동방식을 찾는데 강화학습을 이용한다.

• Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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• 1999.10a
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• pp.39-43
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• 1999

불포화대에서 LNAPL의 이동과 분포를 수치 모의를 통하여 예측하였다. 균질한 매질에서 LNAPL의 이동은 조립질 매질에서 빠르고, 세립질 매질에서 더 많은 면적으로 확산되며, 더 많은 LNAPL이 불포화대에 잔류한다. 조립질 매질내에 세립질층이 존재할 경우, 이 층이 지하수면으로부터 멀수록 LNAPL이 많이 포획된다. 조립질 매질에 세립질 또는 더 조립질인 매질이 렌즈 상으로 존재하는 환경에서는, LNAPL이 이들 렌즈를 통과하지 못한다. 불균질한 렌즈가 존재할 때의 LNAPL 분포를 초기조건으로 이용하여, 지하수 면의 수직 이동과 물의 침투에 따른 LNAPL의 이동을 모의하였다. 두 경우 모두 불포화대에 잔류되어 있던 LNAPL의 수직방향 이동이 증가되었다. 특히, 지하수면의 하강 시 LNAPL이 조립질 렌즈를 통해 이동하나, 세립질 렌즈를 통해서는 이동하지 못한다.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.219.2-219.2
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• 2010

가스하이드레이트(gas hydrate)는 고압과 저온 조건에서 물분자간의 수소결합으로 형성되는 3차원 격자구조에 동공(cavity)이라는 빈 공간이 생기고 이 동공에 가스가 물리적으로 포획되어 생성되는 것으로, 수소결합을 하는 물의 격자(Host) 내에 메탄등의 저분자가스(Guest)가 포획된 결정체이다. 가스 하이드레이트는 미량의 물을 첨가, 가압하면 부피비로 약 200배의 가스를 고상의 형태로 저장할 수 있으며, 열역학적으로 안정된 결정체이기 때문에 하이드레이트로 존재하기 위한 최소한의 온도, 압력조건이 충족되면 고상으로 항구적인 존재가 가능할 수 있어 가스의 수송 및 저장에 높은 경제성을 가지는 방법이다. 현재 운영중인 전국의 242개소 매립지 중에서 발전 및 연료로 활용가능한 조건을 같춘 자원화 대상 매립지는 약 14곳에 불과한 형편이고 이들 중 대부분 시설은 자원화 시설을 운영하고 있으나. 중소규모 매립지에서 발생하는 LFG에 대하여 효율적인 이용 및 처리 방안이 없어 태워 없어지거나 방치하는 등 매립가스를 활용하는 기술은 미흡한 실정이다. 이러한 LFG는 많은 환경적인 문제를 야기하지만, 50vol% 이상의 고농도 메탄이 함유되어 있어 이를 대체에너지원으로 이용할 경우 환경적인 문제를 해결함과 동시에 신재생에너지원으로 활용 가능하다. 본 연구에서는 중소규모 매립지에서 발생하는 LFG를 활용하기 위하여 하이드레이트 형성/해리 Pilot plant의 제작을 통하여 $CH_4$와 $CO_2$(단일, 복합가스의 실험)의 하이드레이트화 연구를 진행 중이다.

• Korean Journal of Environmental Biology
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• v.27 no.2
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• pp.146-154
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• 2009

To suggest effective ways of the management of reptiles in Korea national parks, we applied PIT (passive integrated transponder) tag and radio telemetry research methods in the monitoring of reptiles in Odaesan and Woraksan national parks. We implanted PIT tags into 137 snakes (six species) captured in both the national parks between March 2006 and October 2008 and also radio-tracked two Korean rat snakes (Elaphe schrenckii anomala) from September 2007 to November 2008 in the Woraksan national park. Of total 137 snakes which we had inserted the PIT tag, 17 snakes (12.40%) were recaptured. Based on the PIT tag data of the recapture, we successfully obtained the annual growth rate of Korean cat snakes (Elaphe dione) and Red-tongue pit-viper (Gloydius ussuriensis). Home range of the Korean rat snakes based on the data of radiotracking was estimated as 389,600$m^2$ (MCP: Minimum convex polygon) and 471,800$m^2$ (Kernel 95%) for males and 162,500$m^2$ and 208,700$m^2$ for females. These results suggest that if we apply PIT tag and radio telemetry research methods to manage reptiles in Korea national parks, it could greatly increase our understanding about their basic ecology and as the result, it could allow us to develop better management and conservation ways of reptiles in Korea national parks.

• Journal of Conservation Science
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• v.37 no.5
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• pp.440-450
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• 2021

Temperature and humidity data collection using real-time sensors and data loggers was conducted for integrated pest management in the collection storage and exhibition space of the Jeongnimsaji Museum, Buyeo. The real-time temperature and humidity monitoring system collected measurement data every 30 minutes and enabled real-time confirmation of the data through a linked application. If the temperature and humidity data measured in the real-time temperature and humidity monitoring system exceeds the set range, a push notification was sent to the mobile phone of the person in charge to provide status information to establish a continuous management system. Through this, it was possible to immediately recognize and take action when the temperature range exceeded the recommended relic temperature in August. We performed data visualization on the concentration of airborne fungus in the storage area and the inflow path and density of insects. Based on the recommended criteria presented by the National Institute of Cultural Heritage, The data on the spatial and temporal concentration of airborne fungus inside the collection storage were found to be maintained at a value below the standard recommended by the National Institute of Cultural Heritage (80 CFU/m³). Also, as a result of the insect inflow survey, no insects were captured inside the storage area, and in the case of the exhibition space, insects such as Scutigera coleoptrata, Loxoblemmus arietulus, Diestrammena asynamora, Koreoniscus racovitzai were captured. Based on this, as a result of visualization according to the individual density of captured insects by area, it was confirmed that the main inflow paths of insects were the external entrance and the toilet area.

• Journal of Wetlands Research
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• v.26 no.1
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• pp.32-40
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• 2024

The purpose of this study is to collect basic information about Narrow-mouthed Toad (Kaloula borealis) by analyzing the morphological characteristics of Narrow-mouthed Toad (Kaloula borealis) caught in pitfall traps. The study site is in Godeok-dong, Gangdong-gu, Seoul, and a total of 1,063 individuals were captured using pitfall traps for a total of four years from July 2016 to November 2020. Narrow-mouthed Toad (Kaloula borealis) were classified into adult and immature individuals based on length (SVL), and differences in sex ratio and shape were confirmed for adults. As a result, all adult males had a pair of white bands observed in the abdomen, and females had eggs identified in the abdomen. Through previous studies, a pair of white bands on the abdomen were determined to be male gonads, and were also confirmed in some immature individuals. The sex of the Narrow-mouthed Toad (Kaloula borealis) could be distinguished by the presence or absence of a pair of white bands located on the abdomen, and it is believed that this can be used as a sex classification method that can be confirmed in the field. During the study period, the adult sex ratio was confirmed to be 697 male (65.57%) and 366 female (34.43%), with more males. It is expected that this method of sex ratio and male/female sex ratio will be used not only for species restoration and monitoring of migration and alternative habitats due to development, but also as basic data for various ecological studies.

• Korean Journal of Environment and Ecology
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• v.36 no.6
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• pp.582-591
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• 2022

This study was conducted to eliminate Myocastor coypusMolina, 1782 (Nutria) from Jeju Special Self-Governing Province, South Korea. Habitat identification and eradication were carried out from September to November 2013, and a survey was carried out until June 2022 to check whether the eradication was successful. The habitat was identified with unmanned cameras, interviews, and literature surveys, and the capture was performed using the trapping method with food to attract nutria to the habitat area. The study area for the follow-up survey, which was set relatively wide considering nutria's home range, included wetlands and rivers within 4.0 km² of the habitat area (eradication area). As a result, nutria's habitat was confirmed only at Songdang Ranch, Songdang-ri, of Jeju Island, with traces of habitat (footprints, excrement, and burrows) confirmed in waterways and ponds within the pasture. Eight individuals were captured, including four females, three males, and one individual in too advanced a state of decay to identify the sex. The follow-up survey thoroughly investigated the habitat and its surroundings, focusing on three areas with permanent water, Seongeup Reservoir, Cheonmi Creek, and Molsuni Pond, but no signs of habitat were identified. Therefore, it is determined that nutria inhabiting Jeju Island has been completely eradicated. It is believed that the successful eradication of nutria in the Jeju Special Autonomous Region was possible due to a synergy between 1) the eradication of nutria at the beginning of the settlement phase through rapid capture after confirming the nutria habitat and 2) the delayed expansion period because of rare presence of wetlands, where water is constantly stagnant, on Jeju Island. These results imply that quickly identifying the ecological characteristics of the species and preventing disturbances before they or at the beginning of the ecological disturbance through control and eradication at the initial stage of settlement before the expansion stage is an effective measure to cope with the influx of alien species.