• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2011년도 추계학술대회 초록집
• /
• pp.81.1-81.1
• /
• 2011

High temperature proton exchange membrane fuel cell (HT-PEMFC) has been regarded as a promising clean energy sources. In this study, a quasi-three-dimensional dynamic model of HT-PEMFC has been developed and the local dynamic characteristics are investigated. The model has the geometrical simplification of 2+1D reduction (quasi-3D). The one-dimensional model consists of nine control volumes in cross-sectional direction to solve the energy conservation and the species conservation equations. Then, the one-dimensional model is discretized into 25 local sections along the gas flow direction to account for gas and thermal transport in channels. With this discretization, the local characteristics of HT-PEMFC such as species conservation, temperature, and current density can be captured. In order to study the basic characteristics of HT-PEMFC, it is important to investigate the local dynamic characteristics. Thus, the model is simulated at various operating conditions and the local dynamic characteristics related to them are observed. The model is useful to investigate the distribution of HT-PEMFC characteristics and the physical phenomena in HT-PEMFC.

• 한국산림과학회지
• /
• 제101권1호
• /
• pp.7-19
• /
• 2012

환경부는 2005년 야생동 식물법을 제정 공포후, 2011년 6월에 멸종위기야생동 식물 지정 해제 목록과 함께 지정관리 기준안을 발표하였다. 고등식물의 경우 64종중 멸종위기 I, II등급 유지 및 등급 변경종은 40종, 멸종 위기 해제종(안)은 19종, 해제예정종(안)은 5종, 신규지정종은 29종, 지정후보종은 3종으로 본 연구에서는 모두 96종을 IUCN의 적색목록의 범주와 평가기준 ver. 3.1에 의해 재평가를 함과 동시에, 환경부에서 제시한 멸종위기야생동식물 지정관리 기준 및 절차와 시스템의 문제점을 검토하였다. 변경된 환경부 목록의 40종의 평가 결과를 보면 남한을 경계로 한 평가로 인하여 전세계 수준의 평가인 IUCN 적색목록으로 등재될 개느삼, 미선나무, 한계령풀, 솜다리, 노랑무늬붓꽃, 히어리가 모두 환경부 목록에서 해제되었다. 추가 신규제정도 이와 유사하며 지정후보종인 섬국수 나무는 기존 연구에서 인가목조팝의 이명으로 보는 견해와, 비합법적으로 발표한 학명인 참골담초가 포함되어 문제의 소지가 있다. 환경부에서 제시하는 IUCN적색목록을 개선하였다는 내용은 IUCN 적색목록을 수정한 것이 아니라 평가 방법을 잘못 번역함과 동시에 적색목록의 범주를 단순히 참고하는 수준이다. 특히, 관련용어의 정의에 대한 오역과 이해를 못하고 번역해서 임의로 평가기준을 혼용하고 있어 평가 자체를 혼란과 왜곡으로 유도하는 결과물로 수용하기 어렵다. 환경부의 멸종위기종 목록을 개선하는 데에는 고유종에 대한 매우 좁은 종의 개념대신 주변 국가에서 넓은 개념으로 보는 분류학적 소견을 수용할 필요가 있으며, 남한이나 북한의 국토 개념의 평가가 아니라 최 소 한반도를 기준으로 전세계 수준의 평가를 할 필요가 있다.

• 한국작물학회:학술대회논문집
• /
• 한국작물학회 2017년도 9th Asian Crop Science Association conference
• /
• pp.74-74
• /
• 2017

Wheat is one of the world's most important crop species. Recently, abnormal climate changes directly influence on the significant reduction of wheat productivity in the world. This threaten allow breeders to find new genetic resources. Wheat is one of the widely grown crops in the world. Individual cultivars / germplasm is adapted in that region where the climate is unique to each other. Therefore, introducing new genetic resources which was good in one place may better perform in another region. In this study, we evaluated germplasm in Korean environment and measured numerous agro-morphological characteristics. Information that are provided by the National Agrobiodiversity Center (Jeonju, Korea) and National Plant Germplasm System (Aberdeen, USA) were included in the analysis. Cluster analysis was performed using the unweight pair-group method of averages. The results of PCA indicated principal discriminatory characteristics of wheat landraces and varieties. Significant differences indicated high variability among the quantitative traits. Cluster analysis results showed that the groups were divided by geological climate condition. The preliminary evaluation of germplasms in Korean environment would help to develop wheat cultivars via providing useful genetic traits that are resided in alien germplasms.

• 신재생에너지
• /
• 제19권2호
• /
• pp.1-12
• /
• 2023

In this study, an efficient one-dimensional model was developed for predicting microchannel steam/methane reformers with thin washcoat catalyst layers with a focus on low-pressure reforming conditions suitable for distributed hydrogen production systems for fuel cell applications. The governing equations for steam/methane mixture gas flowing through the microchannel reformer were derived considering the species conservation with reforming reactions and energy conservation with external convective heat supply. The reaction rates for the developed model were simply determined through the catalyst effectiveness factor correlations instead of performing complicated calculations for the steam/methane reforming process occurring inside the washcoat catalyst layers. The accuracy of the developed was verified by comparing the results obtained herein with those obtained by the detailed computational fluid dynamics calculation for the same microchannel reformer.

• ALGAE
• /
• 제26권2호
• /
• pp.109-140
• /
• 2011

Taylor's (1960) floristic treatment of the benthic marine algae of the tropical and subtropical western Atlantic and Wynne's (2011) "checklist: third revision" serve as benchmarks in a review of changes made in the past half-century period. There has been a great increase in the number of recognized taxa of red, brown and green algae at all taxonomic ranks: from 758 to 1,393 species, an increase of 84%; from 231 to 406 genera, an increase of 75%; and from 63 to 106 families, an increase of 68%. In regard to recognized infraspecific taxa, the increase was less dramatic, from 140 to 185, thus a 32% change in the 50-year period. This review addresses the question: What factors were responsible for this proliferation of taxa that are now recognized in this domain of the tropical and subtropical western Atlantic? The answer is that many reasons contributed to these changes. Foremost among these causes have been the advances in gene-sequencing technologies. Revised phylogenetic relationships have led to many genera being divided into more than one genus, as well as new families and orders being delineated. Numerous examples of cryptic species have been discovered by gene-sequence and DNA-bar coding studies. This trend is depicted by case studies. Examples of genera being divided are Galaxaura, Liagora and Laurencia. Tricleocarpa and Dichotomaria have been segregated from Galaxaura. Trichogloeopsis, Ganonema, Izziella, Yamadaella, and Titanophycus have been segregated from Liagora. Chondrophycus, Osmundea, Palisada, and Yuzurura have been segregated from Laurencia. Examples are given of other genera present in this region of the western Atlantic that have been split up. Many genera have increased in terms of the number of species now assigned to them. Taylor's (1960) treatment recognized only two species in Hypoglossum, whereas Wynne's (2011) checklist contained a total of 9 species of Hypoglossum. Taylor's account included only two species of Botryocladia, but this number had grown to 15 in Wynne's checklist. Examples of new genera and species occurring in the region of the western Atlantic are given, and examples of taxa being newly reported for this domain are provided. An increase in the number of phycologists in Latin and South America, exploration of previously unexplored regions, and the increasing use of SCUBA for collecting and at greater depths have all contributed to the increase in the number of algal taxa that are now recognized as occurring in the tropical and subtropical western Atlantic.

• 한국해양학회지
• /
• 제22권3호
• /
• pp.179-190
• /
• 1987

1983년 9월부터 1987년 3월까지 韓國沿岸域에서 출현한 浮游性 주조류 중 Thalassiosira 屬의 소형종에 대하여 走査電氣顯微鏡을 이용하여 微細構造를 연구하 였다. 第2부로서 Thalassiosira aestivalis, T.allenii, T.binata, T. Conferta, T. pacifica 및 T. rotula 등 6종을 同定.記載하였으며, 이중 Thalassiosira allenii, T.binata와 T. Conferta는 韓國産 未記錄種으로 보고 한다.

• International Journal of Control, Automation, and Systems
• /
• 제5권4호
• /
• pp.444-455
• /
• 2007

An approach to construct multiple interpretable and precise fuzzy systems based on the Pareto Multi-objective Cooperative Coevolutionary Algorithm (PMOCCA) is proposed in this paper. First, a modified fuzzy clustering algorithm is used to construct antecedents of fuzzy system, and consequents are identified separately to reduce computational burden. Then, the PMOCCA and the interpretability-driven simplification techniques are executed to optimize the initial fuzzy system with three objectives: the precision performance, the number of fuzzy rules and the number of fuzzy sets; thus both the precision and the interpretability of the fuzzy systems are improved. In order to select the best individuals from each species, we generalize the NSGA-II algorithm from one species to multi-species, and propose a new non-dominated sorting technique and collaboration mechanism for cooperative coevolutionary algorithm. Finally, the proposed approach is applied to two benchmark problems, and the results show its validity.

• 한국어류학회지
• /
• 제22권2호
• /
• pp.132-135
• /
• 2010

둥글넙치과에 속하는 Arnoglossus polyspilus 1개체(표준 체장 229.0 mm)가 제주도 주변 해역에서 처음으로 채집되었다. 본 종은 꼬리지느러미 상엽과 하엽에 두개의 작은 연조가 있으며, 등지느러미 앞부분의 연조는 약간 연장되었다. 위턱은 전체 길이의 좌측 눈 아래 1/3 앞까지 도달하고, 첫 번째 새궁의 상지에는 1개의 새파를 갖는다. 본 종의 신한국명을 "노랑반점가자미"라고 명명하였다.

• 한국환경복원기술학회지
• /
• 제10권4호
• /
• pp.1-7
• /
• 2007

As more highways are constructed and more cars are running on them, toll of roadkill steadily increases. To make the problem more serious, roadkill include endangered species. This study compared two sets of roadkill data of selected Korean highways. One set of data were produced, as a routine job of everyday, by the Korea Highway Corporation (KHC), and the other by a team of wildlife researchers for a limited period of time for research purposes. The aims of the comparison were to identify if the species of the animal, location of the roadkill, time, and other information were kept reasonably, especially in the forms provided to the patrols of KHC, to be used for research purposes later. Major findings and suggestions are; 1) KHC patrols are not wildlife professionals, which is understandable, and could not identify some animal species killed on the highways. As they also are not aware of the importance of the accurate data for the wildlife protection, education to promote their awareness is needed. 2) Current form used by the patrols is far from enough to produce good data for research. A new and detailed form needs to be designed and provided to the patrols so that they can keep all the necessary data on roadkills for monitoring and research purposes. If these issues are addressed, the data collected daily by KHC will become good inputs for roadkill researches in Korea.

• Journal of Forest and Environmental Science
• /
• 제25권2호
• /
• pp.85-91
• /
• 2009

About 83% of the total population of Lao PDR lives in rural areas. People living near forest are highly dependent on the forest resources closed to their villages. Especially non-timber forest products (NTFPs) provide a wide range of subsistence needs and are the main source of their cash income. They also make a significant contribution to the country economy. The annual export value of NTFPs is considerably high. 708 edible NTFP species (238 edible plants and 470 animals) have been recorded so far, and about 400 plants have been reported and used as medicinal plants by Lao people. One hundred NTFP species are considered as commercial forest products. The striking trend in NTFP resources is the decline of some commercial species due to increased demand on them for commercialization, and the loss of forest by rapid population growth. To sustainablely manage the NTFPs resources, a number of new management systems are under development and support in progress by the government.