• Korean Journal of Environmental Biology
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• v.30 no.4
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• pp.339-348
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• 2012

To survey the seagrass distribution in Jeju and Chuja Islands, we directly observed seagrass beds using SCUBA in July, 2011. Distributional area, species composition, morphology, density, and biomass of seagrasses and environmental characteristics were examined in investigation sites. In particular, three protected seagrass species (Zostera marina, Z. caulescens and Z. caespitosa) were found in the investigation areas. While the three species were found in Chuja Island, only Z. marina was distributed in Jeju Island. Z. marina was distributed only north-eastern coast of Jeju Island, and the total coverage was $238,572m^2$. Total seagrass coverage of Chuja Island was $23,584m^2$. In detail, Z. caulescens Z. caespitosa and Z. marina were 21,216, 1,870 and $498m^2$, respectively. Of these, Z. marina was found from the intertidal to subtidal zones of 5m MSL (mean sea level) depth. Z. caespitosa and Z. caulescens were found in subtidal zones of 3~4 m and 4~6m MSL depth, respectively.

• The Korean Journal of Applied Statistics
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• v.17 no.1
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• pp.61-73
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• 2004

Rotation sampling designs may be classified into two categories. The first type uses the same sample unit for the entire life of the survey. The second type uses the sample unit only for a fixed number of times. In both type of designs, the entire sample is partitioned into a finite number(=G) of rotation groups. This paper is generalization of the first type designs. Since the generalized design can be identified by only G rotation groups and recall level 1, we denote this rotation system as l/G rotation design. Under l/G rotation design, variance and mean squared error (MSE) of generalized composite estimator are derived, incorporating two type of biases and exponentially decaying correlation pattern. Compromising MSE's of some selected l/G designs, we investigate design efficiency, design gap effect, ans the effects of correlation and bias.

• The Korean Journal of Applied Statistics
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• v.25 no.1
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• pp.205-213
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• 2012

Transforming response variable is a general tool to adapt data to a linear regression model. However, it is well known that response transformations in linear regression are very sensitive to one or a few outliers. Many methods have been suggested to develop transformations that will not be influenced by potential outliers. Recently Cheng (2005) suggested to using a trimmed likelihood estimator based on the idea of the least trimmed squares estimator(LTS). However, the method requires presetting the number of outliers and needs many computations. A new method is proposed, that can solve the problems addressed and improve the robustness of the estimates. The method uses a stepwise procedure, suggested by Hadi and Simonoff (1993), to detect outliers that determine response transformations.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.3
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• pp.615-625
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• 2015

This paper proposes new methods and examples for improving fraud detection rules based on banking customer's transaction behaviors focused on anomaly detection method. This study investigates real example that FDS(Fraud Detection System) regards fraudulent transaction as legitimate transaction and figures out fraudulent types and transaction patterns. To understanding the cases that FDS regard legitimate transaction as fraudulent transaction, it investigates all transactions that requied additional authentications or outbound call. We infered additional facts to refine detection rules in progress of outbound calling and applied to existing detection rules to improve. The main results of this study is the following: (a) Type I error is decreased (b) Type II errors are also decreased. The major contribution of this paper is the improvement of effectiveness in detecting fraudulent transaction using transaction behaviors and providing a continuous method that elevate fraud detection rules.

• Resources Recycling
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• v.12 no.1
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• pp.25-32
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• 2003

A study on the separation of heavy metals such as iron, copper, zinc and nickel from electroplating waste water has been investigated. The results showed that the PC-88A was more effective extractant for the extraction of zinc and the efficiency of zinc was to be about 100% at pH 2.5. And copper and nickel were extracted about 100% at pH 2 and more than 90% at pH 4～5 with LIX 84, respectively. On the other hand, in the case of solvent extraction of electroplating waste water(Acid-Alkali type) containing heavy metals, the ferric ion was first extracted at pH 2∼2.5 with 20% Naphthenic acid or 10% Versatic acid-10. And then, copper and zinc were extracted at pH 2 with 3% LIX 84 and at pH 2.5∼3 with 20% PC-88A respectively, remaining nickel in the raffinate. In this manner, the heavy metals in electroplating waste water could be effectively separated with solvent extraction method.

• Korean Journal of Plant Taxonomy
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• v.49 no.4
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• pp.345-370
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• 2019

To identify the flora of the vascular plant on Chujado Island in Chuja-myeon, Jeju-si, Jeju Province, Korea, eleven field surveys were conducted between April to September of 2013 and from May to September of 2018. The results of the surveys identified 558 taxa, with 97 families, 311 genera, 481 species, two subspecies, 65 varieties, and ten forms of vascular plants on Chujado Island. Of the 558 taxa identified, seven were endemic species and eight were rare plants according to the Korea Forest Service. Furthermore, 109 of the taxa identified were from floristic environments, while 62 were considered to be naturalized plants, with three of these considered to be invasive and causes of ecosystem disturbances. The highest degree of similarity among the plants from seven sites adjacent to Chujado Island was found on Saengil Island, at 51.7%.

• Knowledge Management Research
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• v.22 no.3
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• pp.91-106
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• 2021

With the recent rapid development of deep learning technology, the demand for analyzing huge text documents in the national R&D field from various perspectives is rapidly increasing. In particular, interest in the application of a BERT(Bidirectional Encoder Representations from Transformers) language model that has pre-trained a large corpus is growing. However, the terminology used frequently in highly specialized fields such as national R&D are often not sufficiently learned in basic BERT. This is pointed out as a limitation of understanding documents in specialized fields through BERT. Therefore, this study proposes a method to build an R&D KoBERT language model that transfers national R&D field knowledge to basic BERT using further pre-training. In addition, in order to evaluate the performance of the proposed model, we performed classification analysis on about 116,000 R&D reports in the health care and information and communication fields. Experimental results showed that our proposed model showed higher performance in terms of accuracy compared to the pure KoBERT model.

• 인삼약초
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• v.4 no.1 s.11
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• pp.100-105
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• 2006

내년에 주목할 만한 축제/ 암을 이기는 한국인의 음식(13)홍삼/ 충남도, '금산인삼엑스포' 홍보 총력/ "쌀 대신할 작물을 찾아라"/ 제천서 300년 묵은 도라지 경매/ '심'과 30년 쟁투한 전직 법제처장/ 산청 한방휴양지에 대규모 탕제원/ 완도군, '약산 생약초 테마파크' 조성/ 제천을 한방산업의 메카로/ 변성전분, 특별긴급관세 대상에 추가/ 中 백두산 삼계탕 포함 2천 400만원짜리 식단 화제

• 방재와보험
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• s.112
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• pp.68-69
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• 2006

이번 탐방은 한려수도 내에 국내 최초의 육.해상 종합 휴양지인 경남 통영의 '금호 충무마리나 리조트'를 방문하였다. 이곳은 미륵도 관광특구 내에 자리 잡고 있어 요트나 유람선을 타고 인근의 거제도와 비진도, 욕지도, 연화도 등의 섬을 돌아볼 수 있으며, 주변 바닷가와 추도, 연대도, 투미도 등지에서는 바다낚시와 사냥도 즐길 수 있다. 특히, 주변에 세병관, 충렬사, 충무공유적지, 한산도, 거제도 등 관광지가 많아 한국의 나폴리로 불릴 정도로 빼어난 경관을 자랑하고 있다.

• The Hankook-Saengyark Bo
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• no.263
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• pp.2-2
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• 2005

고시형 건강기능식품 5개 품목 추가(녹차추출물, 홍국, 대두단백제품 등) - '한약발전포럼' 발족(오는 7월 6일, 발대식 및 포럼 개최) - 지황, 백출 등 총 2,150t 수입결정(kg당 20원 농가보호기금으로 적립) - 보은군 약초단지 30ha 조성