Food webs have received global attention as next-generation biomonitoring tools; however, it remains challenging because revealing trophic links between species is costly and laborious. Although a link-extrapolation method utilizing published trophic link data can address this difficulty, it has limitations when applied to construct food webs in domestic streams due to the lack of information on endemic species in global literature. Therefore, this study aimed to develop a link extrapolation-based food web model adapted to Korean stream ecosystems. We considered taxonomic similarity of predation and dominance of generalists in aquatic ecosystems, designing taxonomically higher-level matching methods: family matching for all fish (Family), endemic fish (Family-E), endemic fish playing the role of consumers (Family-EC), and resources (Family-ER). By adding the commonly used genus matching method (Genus) to these four matching methods, a total of five matching methods were used to construct 103 domestic food webs. Predictive power of both individual links and food web indices were evaluated by comparing constructed food webs with corresponding empirical food webs. Results showed that, in both evaluations, proposed methods tended to perform better than Genus in a data-poor environment. In particular, Family-E and Family-EC were the most effective matching methods. Our model addressed domestic data scarcity problems when using a link-extrapolation method. It offers opportunities to understand stream ecosystem food webs and may provide novel insights into biomonitoring.

Herbivorous insects can be exposed to soil contaminants via trophic transfer. To assess the effect of accumulated arsenate (As(V)) in host plants on aphids across generations, Myzus persicae were reared for several generations on pepper (Capsicum annuum) grown in soil treated with 0, 2, 4, and 6 mg of As(V) per kg. In the first generation, the body length of M. persicae significantly (p < 0.05) increased on As(V)-treated plants (μ = 1.29 mm) compared to untreated plants (μ = 1.21 mm). Aphids showed higher fecundity on plants treated with 2mg/kg of As(V) (15.3) compared to untreated ones (10.6), but it decreased again under the 4mg/kg (11.4) and 6mg/kg (11.2) treatments. When newborns were transferred to untreated plants after being reared on each treatment for two previous generations, they exhibited higher fecundity as their parents were treated with higher levels of As(V). While more research is needed to understand the unexpected beneficial effects, this study highlights the complex impacts of soil As(V) on aphid dynamics which span multiple generations.

Many changes in the scale and structure of the Korean rice cropping system have been made over the past few decades. Still, insufficient research has been conducted on the sustainability of this system. This study analyzed changes in the Korean rice cropping system’s sustainability from a system ecology perspective using an emergy approach. For this purpose, an emergy table was created for the Korean rice cropping system in 2011, 2016, and 202, and an emergy-based indicator analysis was performed. The emergy analysis showed that the total emergy input to the rice cropping system decreased from 10,744E+18 sej year-1 to 8,342E+18 sej year-1 due to decreases in paddy field areas from 2011 to 2021, and the proportion of renewable resources decreased by 1.4%. The emergy input per area (ha) was found to have decreased from 13.13E+15 sej ha-1 year-1 in 2011 to 11.89E+15 sej ha-1 year-1 in 2021, and the leading cause was a decrease in nitrogen fertilizer usage and working hours. The amount of emergy used to grow 1 g of rice stayed the same between 2016 and 2021 (specific emergy: 13.3E+09 sej g-1), but the sustainability of the rice cropping system (emergy sustainability index, ESI) continued to decrease (2011: 0.107, 2016: 0.088, and 2021: 0.086). This study provides quantitative information on the emergy input structure and characteristics of Korean rice cropping systems. The results of this study can be used as a valuable reference in establishing measures to improve the ecological sustainability of the Korean rice cropping system.

Background: As South Korea enters an aged society, the government has emphasized the need for a soft landing of the older adults into the community after the acute and recovery periods under a national policy of “community care.” However, the institutionalization of community rehabilitation services to implement this is insufficient. Japan had already entered an aged society when the Long-Term Care Insurance System was introduced in 2000. Thus, the case of Japan’s institutionalization of the system is expected to have implications for us in supplementing a suitable system for the aged society. Objects: This study compared the institutionalization process of the Long-Term Care Insurance System in South Korea and Japan and the services currently being implemented in each country. Methods: To examine the institutionalization process and services of the system, related legal rules and regulations, government reports, and articles were reviewed. To examine the operation status of the system, statistical data provided by each country’s government were analyzed. Results: Japan recognized the importance of community rehabilitation even before the enactment of Long-Term Care Insurance. Thus, community rehabilitation services, such as homevisit rehabilitation and health facilities, were already stipulated in the law. Under such institutional legacy, Long-Term Care Insurance was able to establish a service system, which balanced welfare and health-related services, including various types of services with enhanced rehabilitation functions. In South Korea, rehabilitation policies were not much considered in the process of institutionalizing the system; thus, it was composed mainly of services focusing on care and recuperation. Conclusion: In order to realize community care, rehabilitation services need to be developed in Long-Term Care Insurance System in various forms such as home-visit services, daily services, short stay, and facility services.

공간 샘플링은 공간모델링 연구에 활용되어 샘플링 비용을 줄이면서 모델링의 효율성을 높이는 역할을 한다. 농업분야에서는 기후변화 영향을 예측하고 평가하기 위한 고해상도 공간자료 기반 모델링에 대한 연구 수요가 빠르게 증가하고 있으며, 이에 따라 공간 샘플링의 필요성과 중요성이 증가하고 있다. 본 연구는 국내 농지 공간샘플링 연구를 통해 농업분야 기후변화연구의 공간자료 활용의 효율성을 제고하고자 하였다. 본 연구는 층화랜덤샘플링 을 기반으로 하였으며, 1 km 해상도의 농지 공간격자자료 모집단 (11,386개 격자)에 대해서 RCP 시나리오별 (RCP 4.5/8.5) 연대별 (2030/2050/2080년대) 공간샘플링을 설 계하였다. 국내 농지는 기상 및 토양 특성에 따라 계층화 되었으며, 샘플링 효율 극대화를 위해 최적 층화 및 샘플 배정 최적화를 수행하였다. 최적화는 작물수량, 온실가스 배출량, 해충 분포 확률을 포함하는 16개 목표 변수에 대해 주어진 정밀도 제한 내에서 샘플 수를 최소화하는 방향으로 진행되었다. 샘플링의 정밀도와 정확도 평가는 각각 변동계수 (CV)와 상대적 편향을 기반으로 하였다. 국내 농지 공간격자 모집단 계층화 및 샘플 배정 및 샘플 수 최적화 결과, 전체 농지는 5~21개 계층, 46~69개 샘플 수 수준에서 최적화되었다. 본 연구결과물들은 국내 농업시스템 대표 공간격자로써 널리 활용될 수 있을 것으로 기대된다. 또한, 기후변화 영향예측 공간모델링 연구들에 활용되어 샘플링 비용 및 계산 시간을 줄이면서도 모델의 효율성을 높이는 데에 기여할 수 있다.

Prediction of the behavior of heavy metals over time is important to evaluate the heavy metal toxicity in algae species. Various modeling studies have been well established, but there is a need for an improved model for predicting the chronic effects of metals on algae species to combine the metal kinetics and biological response of algal cells. In this study, a kinetic dynamics model was developed to predict the copper behavior (5 μg L-1, 10 μg L-1, and 15 μg L-1) for two freshwater algae (Pseudokirchneriella subcapitata and Chlorella vulgaris) in the chronic exposure experiments (8 d and 21 d). In the experimental observations, the rapid change in copper mass between the solutions, extracellular and intracellular sites occurred within initial exposure periods, and then it was slower although the algal density changed with time. Our model showed a good agreement with the measured copper mass in each part for all tested conditions with an elapsed time (R 2 for P. subcapitata: 0.928, R 2 for C. vulgaris: 0.943). This study provides a novel kinetic dynamics model that is compromised between practical simplicity and realistic complexity, and it can be used to investigate the chronic effects of heavy metals on the algal population.

It is important to consider interaction between species in understanding structure and function of the biological community. Current ecological issues such as climate change and habitat loss emphasize the significance of the concept of species interaction in that varying species’ interaction across environmental gradients may lead to altered ecological function and services. However, most community studies have focused on species diversity through analysis of quantitative indices based on species composition and abundance data without considering species interactions in the community. ‘Ecological network analysis’ based on network theory enables exploration of structural and functional properties of ecosystems composed of various species and their interactions. In this paper, network analysis of Cheonggye stream as a case study was presented to promote uses of network analysis on ecological studies in Korea. Cheonggye stream has a simple biological structure with link density of 1.48, connectance 0.07, generality 4.43, and vulnerability 1.94. The ecological network analysis can be used to provide ecological interpretations of domestic long-term monitoring data and can contribute to conserving and managing species diversity in ecosystems.

The long-term biological monitoring data in domestic streams need to be appropriately analyzed. Food-web analysis using network-based approach can give ecological implications on these kinds of data by including interactions between species. The purpose of this study is constructing food-webs as a preliminary step of the analysis. We used observed species list data for 8 years (2008-2015) provided in Water Information System (WIS), focusing cheonggye streams as a case study. On the basis of species interaction dataset extracted from Global Biotic Interactions (GloBI) database, 96 food-webs were constructed. In further studies, these food-webs could be analyzed in various ways such as static, dynamic and spatial approaches.

Understanding biotic interactions is important to illustrate ecological functions of stream environments. The purposeof this study is to compare the ecological functions of natural and artificial streams. For linking species, we used bioticinteraction databases and made food-webs for species lists of 18 streams in Seoul, Korea. We conducted species removalanalysis of networks and compared network beta-diversity between watersheds. The results showed that natural streamswere more affected by a removal of keystone species than artificial streams. The cheonggye watershed including artificialstreams had high dissimilarities among streams, presenting that artificial streams had different functions from natural streams.

The ever-evolving fashion industry has brought forth direct and indirect effects on the environmentto the extent that environmental contamination, labor exploitation, and pirated or counterfeit products have emerged as serious social issues. The sustainability-related issues are associated with all stages of the product lifecycle, ranging from the extraction of raw materials to product disposal (Berkhout & Smith, 1999).In lifecycle management (LCM), the triple bottom line (TBL) of sustainability is seen from the perspective of the product lifecycle (Kocmanova & Nemecek, 2009). TBL refers to corporate efforts to keep a balance among financial viability, environmental soundness and social accountability (Elkington, 1997). As sustainable products are defined in the light of lifecycles, research on product lifecycle management (PLM) has drawn much attention (Gmelin & Seuring, 2014).In addition, PLM is known to exert substantial effects on new product development, which warrants the need to view new sustainable products from the perspective of PLM (Cantamessa, Montagna, & Neirotti, 2012). Therefore, the present study intends to apply a conceptual model of PLM-based new sustainable product development to the fashion industry and to take multifaceted approaches to sustainable fashion product development. To that end, case studies of 21 local and global sustainable fashion brands, 1:1 in-depth interviews with 24 experts from sustainable and non-sustainable fashion brands, and participant observation of 5 sustainable fashion brands were conducted as part of this study. The findings illuminate the management issues attributable to the lack of technology and expertise, as well as the quantification issues involving monitoring or normalized data collection, despite the presence of some process-specific sustainable items in sustainable products developed by the fashion brands. Also, the findings will serve as reference data for further discussions and provide some implications for the sustainable fashion product development of fashion brands.

Along with the increasing interest in integrated writing in L2 instruction, many studies have investigated language skills and cognitive processes involved in the task. However, relatively less is known regarding the roles of strategic and affective variables in predicting writing performance. The current study, therefore, investigates (a) how strategy, attitudinal, affective, and ability variables are related, and (b) how these variables predict performance in integrated writing. Predictor variables include proficiency, reading comprehension, vocabulary size, L2 strategy use, and attitudes toward reading and writing, and anxiety. Forty-three participants completed an L2 reading-writing integrated task, in which they read reading texts and wrote an essay summarizing the source text and arguing their opinions on the issue. Results showed that proficiency was positively related to reading-to-write strategies, and vocabulary size negatively to reading anxiety; however, ability-related variables generally had no or weak relationships with affective variables. Furthermore, only reading comprehension and reading anxiety were found to be significant predictors of performance in integrated writing.

Global warming can seriously influence on the interaction between pest and natural enemy in the agroecosystem due to the differences in optimal temperature ranges. Two aphid-ladybug systems, Myzus persicae-Coccinella septempunctata (M-C) and Aphis gossypii-Coccinella septempunctata (A-C) in the pepper crop were simulated, respectively under four different temperature scenarios including crop development over 244 days with the assumption that the average temperature is higher by 1, 3, and 5 °C than that in Seoul in 2000. Temperature-dependent functions for each aphid-ladybug system were embedded in Rosenzweig-Macathur predator-prey model to explore their population dynamics, and then Dynamic Index was used to quantify the strengths of species interactions. The result shows that the predator-prey population cycles as well as species interactions are getting shorter and stronger in both systems as temperature increased. Especially, the excessively high temperature scenario in Aphis gossypii-Coccinella septempunctata system could result in the extreme species interaction. Therefore, the increasing temperature can facilitate the effectiveness of biological control because of growing crop plant development and much stronger species interaction, although there are increases of the frequency of pest occurrences.

With the diffusion of smart-phones and mobile equipment, as well as the emergence of consumption patterns like showrooming and reverse showrooming, not only online shopping, but also offline stores are becoming important. For this reason, a multichannel which simultaneously runs both offline and online channels is getting the spotlight. A multichannel means a series of activities related to selling goods and services to consumers via more than one channel (Levy & Weitz, 2011). To adapt to this change of the retail environment, the Dongdaemun market, the source of Korean mass fashion, is introducing a multichannel to manage online and offline channels together. ‘Style Nanda’, based on Dongdaemun, is a representative branding case. Having starting with an online shopping mall, ‘Style Nanda’ is now running offline stores and is planning to enter overseas markets. Another example is that of Roompacker which has grown up from an offline store in the Dongdaemun Doota Shopping Mall launched in 2005 and is now emerging as the online and offline powerful actor in the market. As mentioned above, Dongdaemun fashion market-based brands are competitive when they have a multichannel to simultaneously run offline channels, online, and mobile channels. The existing Dongdaemun fashion market-related research has been limited to the analysis of Dongdaemun market’s structural characteristics or the consumer perception of the shopping conditions (Hong & Lee, 2007; Choi & Choo, 2005). Also, most multi-channel studies have focused on the consumer perceptions depending on the channel characteristics; therefore, the studies that measured consumer responses depending on the brand characteristics are very scarce. With the change in the retail environment and the increase in the necessity of revitalizing Dongdaemun commercial districts, a study on the multi-channel properties of the Dongdaemun brands would provide many useful implications. In this context, this research aims to analyze the characteristics of the Dongdaemun market, which is offline-optimized, as well as the utilities and attributes of multichannel shopping services of Dongdaemun fashion brands. Our second aim is to provide implications for marketing. In particular, this research is focused on the effects of these attributes on value equity, relationship equity, and brand equity which are customer equity drivers of Dongdaemun fashion brand consumers. Furthermore, this research explores the effects of customer equity drivers on customer satisfaction and purchase intention. A total of 200 samples were collected to examine the effects on customer equity drivers of Dongdaemun multichannel attributions by consumers in Dongdaemun Fashion Market. The collected data were then analyzed statistically (exploratory factor analysis, reliability analysis, and descriptive statistics) with SPSS 21.0. Furthermore, AMOS 18.0 was used for confirmatory factor analysis and multiple group analysis. The results of this research will serve as a foundation for a distribution channel research to measure the characteristics of Dongdaemun and customer equity regarding a multichannel. They will also be practically helpful in establishing a strategy to introduce a multichannel of offline-centered brands.

Lepidopteran hitchhikers were investigated in vessel at five major ports of Korea in 2013. These moths were collected by International Plant-Quarantine Accreditation Board (IPAB) during inspection on vessels for Asian Gypsy Moth (AGM). The results typically include the taxonomic identification, their origin localities, and information related to commodities and ship’s route. A total of 1,026 individuals were detected in vessels and identified with 236 species belonging to 21 families. Although most of the species are already known to the Korean fauna, the following three species are unknown: Lymantria xylina Swinhoe (Lymantriidae), Glyphodes actorionalis Walker (Crambidae), and Histia flabellicornis nigrinus Jordan (Zygaenidae). Interestingly, H. flabellicornis nigrinus Jordan was detected for two consecutive years. Although this species is not an important pest, it will be need to necessarily continual monitoring. L. xylina Swinhoe which is a great potential forest pest, was detected four times (16 specimens) at Busan port of entry. Therefore, it is necessary to provide comprehensive border surveillance monitoring and a valuable historical record of the array of lepidopteran hitchhikers transported to the Korea through inanimate pathway, in order to counter further potential importance of hitchhikers on international vessels at Korea.