Jeju City Research Articles

A Study on Improvement of Target Setting Criteria for Disaster Prevention Performance in Jeju Island

The government has set the disaster prevention performance target rainfall by the local government (National Emergency Management Agency, 2012) as a flood control policy that can prepare against natural disaster. However, the method of setting the disaster prevention performance target rainfall by municipalities does not reflect the rainfall characteristics of mountainous regions and islands. In this study, rainfall data reflecting the altitude and regional characteristics were analyzed using the meteorological observation system (ASOS, AWS) for Jeju Island. As a result, it was found that the rainfall increases about 1 ~ 4 times as the altitude increases from the lowland to the highland, and the existing disaster prevention performance target standard of Jeju Island does not reflect altitude characteristics. In addition, The target rainfall for disaster prevention performance is presented as dividing the two localities of Jeju city and Seogwipo city into Jeju East, West South and North areas. It is considered that various factors can be reflected in the compatibility assessment stae of rainfall estimation standard. Keywords: Disaster Prevention Performance Target, Jeju Island, Elevation, Site

A Sociolinguistic Considerations of Linguistic Landscapes in Jeju

This paper aims to investigate how Jeju linguistic landscape is composed by analyzing the official and non-official signs of the two different places in new town and old town in Jeju city. The collected signs were analyzed and classified on the basis of Backhaus’ research questions and analytical categories. It shows that multilingual signs are much more than monolingual ones in new town, which is quite the opposite in old town and that English is predominantly used on both the monolingual and multilingual signs of the two areas, apart from Korean. However, there is something unique about the multilingual signs on Baozen street, new town, are composed of Chinese much more than in old town. This enables us to predict there are more chinese customers visiting in new town than in old town. As a result, linguistic overview from a linguistic analysis seems to provide some insight into the better understanding of language use in Jeju.

태권도장 경영환경에 따른 관원 학부모들의 재등록 및 긍정적 구전의도

The purpose of this study was to investigate the effects of business environment of Taekwondo gymnasium on parents’ re-registration and positive word of mouth intention. This study was conducted on 245 parents who registered their children in Taekwondo gymnasium in Jeju city from July to August 2016. For data analysis, PASW 18.0 version was used for frequency analysis, exploratory factor analysis, reliability analysis, correlation analysis, and multiple regression analysis. Variables of this study consisted of factors; sub-factors on business environment of Taekwondo gymnasium were leader’s quality, facility, educational program, publicity and adversing, and education and dues and sub-factors on parents’ re-registration and positive word of mouth intention were positive word of mouth intention and re-registration intention. The results are as follow. First, facility and education program of business environment factors of Taekwondo gymnasium had significant effects on positive word to mouth intention. Second, leader’s quality factor of business environment of Taekwondo gymnasium had a significant effect on parents’ re-registration. Therefore, it is necessary for the parents to make positive word to mouth and re-registration about the Taekwondo gymnasium through improving the facility and educational program of Taekwondo gymnasium and improving the quality of the leader.

Ionic Compositions of PM2.5 during Summer and Winter in the Downtown Area of Jeju City in Jeju Island

Ionic Compositions of PM2.5 during Summer and Winter in the Downtown Area of Jeju City in Jeju Island

Communicative rationality and attitude among the participants of an urban renewal acceleration project - Focusing on the districts released from the urban renewal acceleration project in Jeju City -

The purpose of this study was to examine the communicative rationality among the participants in urban renewal acceleration projects. To this end, ⅰ)Among subjects who participants that is actively or passively communicative attitude?, ⅱ)Who is involved mainly in communicating positive or negative communicative rationality?, ⅲ)The ointment according to the difference between communicative impact analyzes differ? The results are as follows. First, participation in communicative attitude in the district designated principal active steps was self-employed, residents, professionals, public institutions in order. In the planning establishment step it appeared as self-employed, residents, professionals, public was in order. Second, positive participation in rational communication in the planning stages or establishment step was resident, the media, non-governmental organizations, self-employed in order. Third, the inhabitants of the Jeju island who were a negative response from the truthfulness and fairness than non-native island. Implications are as follows. First, In the urban renewal acceleration project planning process residents should be guaranteed the opportunity to pass the communication. If these participants involved communication were smoothly, they could resolve the conflict and reach an agreement between each other. Second, it is prepared to be president of discussion and deliberation with the regular communicative share. This conflict between interest groups in urban renewal acceleration projects will be able to reduce the social costs that may arise because of the delay on or off. Third, it will keep the communication caring for customs norms of communication and culture in the project area. If the position for understanding the identity of the residents within the project area was preceded they could facilitate communication among the participants.

A Prediction Model For Solar Energy Generation Built Upon Status Monitoring

This paper first presents how to create a data stream of solar power generation from the climate archive open to the public as well as the operation logs accumulated for internal use. Then, a daily prediction model is built to forecast the amount of the future electricity generation according to the weather parameters such as wind speed, temperature, insolation, and sunshine hours in Jeju City. For the regression model built upon the identification of linear dependency of most parameters to the generated solar energy, its fitting accuracy is evaluated in terms of absolute residuals, standardized residuals, Cook’s distance, and error probability distribution. The prediction result shows that the absolute residual stays below 30 kwh and the average at 15.8 kwh, while maximum generation reaching 148 kwh. The prediction model will not only evolve with more record collections, possibly averaging out the effect of some abnormal points, but also make it possible for consumers like electric vehicles to select an energy source out of solar, wind, and legacy grid-providing energies.

옥외광고물의 중국어표기 경관변화에 관한 연구 - 제주시 핵심 상권을 중심으로 -

Outdoor advertising, one of the key elements constituting a view of the urban area, has a characteristic of changes over time. This study examines what changes have happened in the urban landscape by noting the impact of the outdoor advertizing on the city landscape and analyzing changes in the outdoor advertising. The Jeju city, one of the typical tourist cities in Korea, is an area enough appropriate to look into the landscape changes thanks to its booming tourism industry. Three major commercial areas of the Jeju city, Sicheongap, Jewonsageori and Chilseongtong, were chosen as targets for the analysis of their landscape changes. This research result reveals that Jewonsageori shows the biggest changes in the landscape among the three analysis areas.

학생선수의 스포츠자신감과 운동몰입 및 운동지속의도의 관계

The purpose of this study was to examine the relationship among sports confidence, exercise commitment, and exercise adherence of student-athletes. In order to accomplish the purpose of this study, the middle-school/high-school/collegiate athletic of Jeju city made the population and 306 of them were sampled through the convenience sampling method. These were the conclusions after conducting frequency analysis, factor analysis, correlational analysis, regression analysis using SPS 12.0 program. The results are as follows. First, physical/mental preparation, social support, demonstration of ability of sports confidence had positive effect on exercise commitment. Second, physical/mental preparation, coach leadership of sports confidence had positive effect on exercise adherence. Third, exercise commitment had positive effect on exercise adherence.

제주시 구도심 골목길 공간구조 특성변천에 관한 연구 - 무근성 지역을 중심으로 -

This study is to investigate the spatial structure characteristic of the old town alleys formed by present in the region which is targeting Mu-geun-sung areas located in Samdo-2dong, Jeju city. It has been kept its traditional street structure, since the end of 1980s. The above mentioned issues are the purpose of this study and the result can be summarized as follows. First, this study explored not only the characteristics of the Olle and every coner of the Mu-geun-Sung areas but also typology of the alley with dwelling. These results were able to found the properties of the place. Second, through the advanced research regarding transition process of the alley in Old city of Jeju, physical changes in a few Olle types specified by the unit alley setted per a decade were investigated. Blocked Olles and dwelling units were considered as important regional assets for urban regeneration. Eventually, issues mentioned above clarified the time series characteristics of spatial structure based on some types as well as natures of the unit.

Vote-Based Wind Speed Forecast Scheme Built Upon Different Artificial Neural Network Models

This paper designs and develops a wind speed forecast model based on artificial neural networks and voting strategies, aiming at efficiently integrating renewable energies into the power network. The hour-by-hour speed records collected in Jeju city during the past 15 years are classified and converted to create sequential, monthly, and seasonal forecast models, respectively. To predict the next hour speed, the speed records of the previous 5 hours are simultaneously fed to each model first. Then, the voting process picks and averages the two predictions having the best proximity out of 3. The evaluation procedure compares the predicted values and the actual speeds of 2014, which have not been used for training, and finds out that the maximum daily root mean square error for the proposed scheme is smaller than other stand-alone methods by 0.11mps. Moreover, the vote-based scheme avoids the worst case mis-prediction.

A study on travelers' transport mode choice behavior using the mixed logit model: A case study of the Seoul-Jeju route

This study is to analyze passengers' choice of the mode of transportation when air transportation is in competition with high speed rail (HSR). The Seoul-Jeju route analyzed as an empirical case study, in which the construction of an undersea tunnel to connect Seoul and Jeju city by HSR has been considered. The study also included two new variables, ‘safety of transportation’ and ‘availability of duty free shopping’ in addition to traditional transport choice variables such as travel time, travel costs and frequency of service to reflect special characteristics of the market. As data gathering tools, SP techniques and mixed logit model, for analytical methodology, were utilized. The authors found that the goodness of fit of the models was improved with new variables. The models also showed that the characteristics of business passengers and leisure passengers in choosing the mode of transportation were different. Business passengers were apt to choose a safety secured mode of transportation regardless of fare while leisure passengers preferred to use duty free shops more than business passengers.

VESTAP을 활용한 기후변화에 따른 제주도 산불 취약성 평가 연구

본 연구에서는 한국환경정책평가연구원에서 가장 최근에 배포한 기후변화 취약성 평가 프로그램인 VESTAP을 활용하여 RCP 8.5 시나리오를 기반으로 2000년대에서 2040년대까지 제주시 및 서귀포시에 대한 산불 취약성을 평가하였다. 평가된 취약성 지수는 표준화 작업을 통해 제주시 및 서귀포시를 종합한 제주도 전체 읍면동의 산불 취약성 평가에 활용하였는데, 취약성이 높은 상위 10개 읍면동으로 제주시는 도서지역인 추자면과 우도면 그리고 2개의 동지역이, 서귀포시는 대정읍과 5개의 동지역이 산불에 대한 취약성이 상대적으로 높게 평가되었다. This study evaluated the risk of forest fires due to climate change in Jeju using the VESTAP. The study primarily aimed at assessing the risks posed to Jeju city and Seogwipo city, and uses actual and projected date from the period of 2000's to 2040's based on RCP 8.5 scenario. Forest fire vulnerability throughout Jeju-do was determined through the standardization of vulnerability index. The highest vulnerability was determined for the towns of Chuja-myeon, Udo-myeon, two downtown areas in Jeju city, Daejeong-eup, and five downtown areas in Seogwipo city, respectively.

지구물리 탐사에 의해 발견된 제주도 용암동굴의 특징과 의미

제주도에서 기존에 알려진 동굴 이외에 새로운 지하동굴의 존재를 확인하기 위해 제주시 구좌읍 일대에서 지구물리탐사(전기비저항탐사, GPR탐사, ZHF탐사)를 실시하였다. 탐사결과 여러 지점에서 동굴로 추정되는 이상대가 발견되었고, 이상대의 위치와 규모가 일치하는 27개 지점을 선별하여 시추조사를 실시하였다. 그러나 예상과 달리 이상대의 대부분은 용암의 상하부에 형성된 클링커층이거나 용암 사이에 협재된 고토양층이었으며, 5곳에서만 동굴이 발견되었다. 클링커층과 고토양층은 용암과 다른 암석의 물리적 특징으로 인해 이상체로 반응한 것으로 해석된다. 한편 동굴이 확인된 5개 지점 중 2공은 기존에 알려진 용천동굴을 관통하였고, 3공에서 새로운 동굴이 확인되었다. 용천동굴을 관통한 시추공은 시추당시 동굴의 존재가 확인되지 않았던 구간이었으나 용천동굴이 관통됨에 따라 기존 측량도의 오류를 수정하였다. 한편 시추조사로 새롭게 발견된 석회장식 용암동굴은 길이가 약 180 m이며, 상류방향으로 당처물동굴(약 110 m)과 연결되어 있다. 또한 동굴내부에는 용암곡석, 용암제방, 밧줄구조 등이 발달해 있으며, 탄산염 동굴생성물로는 종유관, 종유석, 석순, 석주, 동굴산호 등이 잘 보존되어 있다. 특히 동굴에서 발견되는 탄산염 동굴생성물은 식물 뿌리를 따라 유입된 지표수에 의해 성장하여 독특한 형태를 띠게 된 것으로 추정된다. Geophysical exploration using electric resistivity, ground penetrating radar (GPR), and impedance high-frequency (ZHF) surveys was conducted in Gujwa-eup, Jeju City, Jeju Island, an island in the Korea Strait, to confirm the existence of new caves near known caves. The exploration revealed a number of anomaly zones, presumed to be caves; 27 sites at suitable locations and depth ranges were selected for drilling and further surveys. However, contrary to predictions, most of the anomaly zones were clinker layers or paleosols intercalated with lavas. Only five boreholes intersected caves. The clinker layers and paleosols were possibly detected as anomalies owing to their different physical properties from the other rocks. Two of the five cave-finding boreholes penetrated Yongcheon Cave; a new cave was found at the other. The two boreholes that penetrated Yongcheon Cave were drilled in areas where the cave has not been previously reported, and thus helped correct an error in the cave distribution map. The cave newly discovered in this boring exploration is 180 m long, and it is connected to the upstream part of Dangcheomul Cave (110 m). The cave contains well-developed lava helictites, lava levees, and ropy structures; carbonate speleothems such as soda straws, stalagmites, columns, and curtain shawls are also well preserved. Notably, the unique shape of the carbonate speleothems is attributed to their growth in relation to the cavern water that flowed into the cave along plant roots.

Effects of landscape and management on ground-dwelling insect assemblages of farmland in Jeju Island, Korea

Granite-derived soils are widespread in the farmland of Korea in general. In contrast, Jeju Island has mainly volcanic ash soils. Soils and weather condition in Jeju Island created a unique agricultural system. We identified the features of ground-dwelling insects in farmlands of Jeju Island. This study was conducted in four areas (Samdal-ri and Susan-ri in Seogwipo city, and Dongmyeong-ri and Suwon-ri in Jeju city) in Jeju Island, Korea. Field surveys were carried out twice in summer (June) and autumn (September) in 2013. Ground-dwelling insects were sampled quantitatively by using pitfall traps. As a result, in total 3322 individuals, 137 species, 48 families and 8 orders were investigated in farmlands of Jeju Island. Especially, members of Coleoptera and Hymenoptera accounted for a large proportion of ground-dwelling insect communities. The numbers of species and individuals for major taxonomic groups showed significant regional and seasonal differences. This study implied that the seasonal and regional differences of ground-dwelling insect communities were affected by surrounding land use patterns, life history patterns of each taxonomic group and farmland management.

Critical Localisms and Global Education in Jeju’s Local Streets

Globalization and global competitiveness have become principal concerns in Jeju Island, a former agrarian periphery whose leadership aspires to become a prime international destination. Despite trophy accolades in the form of UNESCO designations and the New Seven Wonders selection, Jeju’s development remains uneven and contradictory. Jeju Island also still lacks an active citizen participation in framing and debating globalization issues. A lack of consensus, democratic process, and resident participation has deepened divisions existing in island society and further puts native locals at a severe disadvantage. Where policymakers have failed, however, grassroots efforts are taking up the task of globalizing Jeju residents. Using the two examples of JICEA’s “Wondosim Yetgil Tamheom”(“Exploring Jeju City’s Old Town Streets”) walks and Global Inner Peace’s September 2015 UN Peace Day event, I discuss the ways these locally-based and locally-founded NGOs are utilizing local experience to provide more nuanced critiques of globalization discourse or to reframe it. I argue that a form of critical localism is necessary to foster more global perspectives.

Eradication Rates of Helicobacter pylori in Korea Over the Past 10 years and Correlation of the Amount of Antibiotics Use: Nationwide Survey.

The efficacy of proton-pump inhibitor-amoxicillin-clarithromycin therapy for H. pylori eradication has decreased over time. We assessed the trend of H. pylori eradication rates over the last 10 years and the relationship between the eradication rates and the amount of macrolide antibiotic use in a country with a high prevalence of H. pylori infection. This vast nationwide multicenter study was conducted with 34,139 adults treated for H. pylori infection from January 2001 to December 2010. The defined daily dose per km(2) (DSD) of macrolide antibiotics was calculated (n = 141,019) using the Health Insurance Review & Assessment data base from 2008 to 2010 in the two cities which had the lowest (Jeju city) or highest (Chuncheon city) eradication rate. The eradication rates of proton-pump inhibitor-amoxicillin-clarithromycin therapy ranged 84.9-87.5% from 2001 to 2007, and those of 2008 to 2010 ranged 80.0-81.4% with a decreasing trend (p < 0.0001). The decreasing trend of eradication rates for the overall first-line therapy was observed only in three of the seven geographic areas in Korea (p < 0.0001). The DSD of macrolide antibiotics was significantly higher in Jeju than Cheunchon city (0.85 vs 0.52, p < 0.0001). H. pylori eradication rates with clarithromycin-containing triple therapy in Korea showed a decreasing trend over the past 10 years, although the trend varied among geographic areas. This difference may be associated with the amount of macrolide antibiotic use.

The Structural Characteristics of Communicative Network among the Participants in the Process of Urban Renewal Acceleration Planning - Focusing on the districts released from the Regeneration Promotion Project of Jeju City -

이 연구의 목적은 제주시 재정비촉진계획 단계별 과정에서 나타나는 참여주체간 의사소통 네트워크의 구조적 특성을 파악하는 것이다. 왜냐하면 이러한 구조적 특성 분석으로 문제점을 도출한다면 적합한 의사소통 네트워크로 조정하여 구축할 수 있기 때문이다. 이를 통해 참여주체 간에 새로운 관계를 형성하고, 상호 간에 새로운 아이디어를 주고받으며, 지속적인 피드백을 통한 새로운 대안을 제시할 수 있을 것이다.BR 사회관계망 분석결과는 다음과 같다. 첫째, 사업계획 과정이 진행될수록 주민과 자영업자의 의사소통 네트워크 중심성은 낮아지고 있었다. 둘째, 사업계획과정 내내 공공기관은 모든 참여주체에게 중개자 역할을 하고 있었다. 셋째, 주민은 사업계획과정 내내 파벌에서 제외된 반면에, 다른 참여주체들은 파벌을 형성하고 있었다. 넷째, 주민과 자영업자는 주도조직 네트워크 관계를 형성하는 다른 참여주체로부터 지배를 받고 있었다.BR 이러한 문제점을 보완하기 위해 지구지정 계획 단계 이전부터 모든 참여주체가 합리적인 의사소통을 바탕으로 합의형성이 되도록 제도적 장치가 마련되어야 할 것이다.

주파수조정용 배터리 에너지저장장치 운전방법의 개발과 적용

Current research and development efforts and other projects for energy storage systems (ESS) have recently been gaining attention. This is due to the many applications where ESS, particularly batteries, can be used. Among these are peak shaving, frequency regulation, and stabilization of renewable energy output. KEPCO has completed the construction and demonstration of a 4-MW battery energy storage system (BESS) located in Jeju City to verify its practicability in the power grid. KEPCO Research Institute has also been developing technology for the commercialization of BESS, and has been conducting a trial run of a 52-MW ESS (28MW + 24MW of Seo-Anseong and Shin-Yongin substations) constructed in 2014 for frequency regulation. This paper discusses the development of operation methods, as well as an operation user interface, for the safe operation and monitoring of BESS used for frequency regulation in a power system. Included are operation and simulation methods for various normal and transient frequency situations that can be experienced by a power system. Also discussed are the results obtained after applying these methods to the 4-MW BESS and the 52-MW ESS, both used for frequency regulation. The technology in this paper will be applied to 500MW ESS for frequency regulation of KEPCO by 2017. It is expected that this technology helps a safe and reliable operation and control of ESS for frequency regulation through its continuous upgrade.

제주시 원도심 골목공간의 특성에 관한 연구 - 시가지 재정비 제도를 중심으로 -

The study is to find regional characteristics of the old town of Jeju city, "Mu-gun-sung," through researches of the status of the spatial structure in the cul de sac roads of the area. In particular, the status and characteristics of the area are clearly defined with the typology of the cul de sac roads based on the urban renewal regulations. The results are listed as follows: First, there are buildings from various periods in the area. Second, it is comparatively analyzed that there are the similarities and differences in Collaborative Development based on a neighborhood plan in Japan and Korea which pursue conservative renewals of the cule de sac roads. Third, the status and characteristics of the area are clarified through the analysis of the types of the cul de sac roads.

Japanese Cedar (Cryptomeria japonica) Pollinosis in Jeju, Korea: Is It Increasing?

Jeju is an island in South Korea located in a temperate climate zone. The Japanese cedar tree (JC) has become the dominant tree species while used widely to provide a windbreak for the tangerine orchard industry. An increase in pollen counts precedes atopic sensitization to pollen and pollinosis, but JC pollinosis in Jeju has never been studied. We investigated JC pollen counts, sensitization to JC pollen, and JC pollinosis. Participants were recruited among schoolchildren residing in Jeju City, the northern region (NR) and Seogwipo City, the southern region (SR) of the island. The JC pollen counts were monitored. Sensitization rates to common aeroallergens were evaluated by skin prick tests. Symptoms of pollinosis were surveyed. Among 1,225 schoolchildren (49.6% boys, median age 13 years), 566 (46.2%) were atopic. The rate of sensitization to Dermatophagoides pteronyssinus (35.8%) was highest, followed by D. farinae (26.2%), and JC pollen (17.6%). In the SR, 156 children (23.8%) were sensitized to JC pollen; this rate was significantly higher than that in the NR (59 children, 10.4%, P<0.001). A significant increment in the sensitization rate for JC pollen with increasing school level was observed only in the SR. JC pollen season in the SR started earlier and lasted longer than that in the NR. JC pollen season in Jeju was defined as extending from late January to mid-April. The prevalence of JC pollinosis was estimated to be 8.5%. The prevalence differed significantly between the NR and SR (5.3% vs 11.3%, P<0.001), mainly due to the difference in sensitization rates. JC pollen is the major outdoor allergen for early spring pollinosis in Jeju. JC pollen season is from late January to mid-April. Warmer weather during the flowering season scatters more JC pollen in the atmosphere, resulting in a higher sensitization rate in atopic individuals and, consequently, making JC pollinosis more prevalent.