해양공간 정책시뮬레이션 기술 개발 - 현황 및 도전과제

조성진(Sung-Jin Cho),강전영(Jeon-Young Kang),박재영(Jaeyoung Park),최희정(Hee-Jung Choi),남정호(Jungho Nam) 한국해양환경·에너지학회 2021 한국해양환경·에너지학회 학술대회논문집 Vol.2021 No.5

“실제로 존재하지 않는 대상을 존재하는 것처럼 만들어 놓은 인공물"을 뜻하는 라틴어 '시뮬라크르(simulacre)'에서 파생된 시뮬레이션(simulation)은, 복잡한 문제를 해석하기 위해서 실제와 비슷한 상태(시스템)를 모델로서 구현하고, 반복 연산을 통해 최적해를 찾는 과정을 뜻한다(Baudrillard, 1994). 전통적인 분석적 방법론(analytical method)은 계수 추정을 통해서 특정 시점의 두 변수, 즉 독립변수와 종속변수의 상관성을 규명하는데 반해, 시뮬레이션 방법론(simulation method)은 현상의 재현을 통해서 과정을 파악하는데 목적을 둔다. 이러한 특징으로 말미암아 시뮬레이션 기법은 문제의 최적해보다 현상의 규명에 더 적합한 방법론이다. 자연계 (nature system)의 문제(가령, 산사태의 발생원인)는 요인들 간 단순하고 명확한 관계에 의해서 정의되지만, 인간계(human system)의 문제(가령, 부동산 가격상승의 원인)는 비교적 복잡하고 불명확한 관계에 의해서 규정된다. 따라서 주로 인간관계에서 비롯되는 사회 문제를 해결하기 위한 수단으로써 정책은 시뮬레이션 기술을 적용하기에 적합한 대상이다. 일반적으로 정책은 결과 못지않게 과정도 중요하며(당위성), 현재·미래 문제를 포괄하고, 긍정적·부정적 효과(양면성)를 함께 고려하므로, 시뮬레이션은 이러한 요건에 잘 부합하는 기술이다. 최근 노인복지(백의현, 2019), 미세먼지(심창섭, 2019), 주택시장(최명섭&변세일, 2016), 인구센서스(배장현 외, 2016) 등 다양한 정책분야에서 시뮬레이션 기술이 활용되고 있다. 2019년에 재정된 “해양공간계획 및 관리에 관한 법률”에 근거한 해양공간기본·관리계획, 해양용도구역, 해양공간적합성협의 등은 해양자원의 효율적 이용과 해양공간의 갈등 및 상충을 해소하기 위한 해양수산 분야의 新정책수단이다. 최근 해양관광, 골재채취, 해상풍력, 해상경계분쟁 등 사회적 이용 및 갈등이 심화되면서 실효성 있는 해양공간정책의 요구가 높아지고 있는 실정으로, 해양정책을 정확하게 평가하고 지원할 수 있는 과학적 도구가 절실하다. 해양공간은 환경·생태계, 지역사회, 수산업, 관광업, 에너지개발 등 복잡한 이해관계가 얽혀 있으며, 정책평가 시 이러한 관계를 명확하게 정의하고 고려해야 한다. 본 연구는 해양공간정책 지원도구로써 해양정책시뮬레이터(Ocean Policy Simulator, OPSim)를 제안하며, 대표적인 복잡계 연구방법론으로서 거시적 현상을 미시적 행위자의 상호작용으로 설명하기 위해 제안된 행위자기반모형(Agent-Based Model, ABM)을 적용하고자 한다. ABM은 정책 대상 및 환경의 동적 변화와 더불어, 자연·인문 환경과의 상호작용(상충 또는 시너지)이 활발한 해양 분야에 적합한 방법이지만, 동시에 시뮬레이션 결과에 대한 검증의 어려움과 모델 인자의 초기값에 대한 의존성 등 한계점을 내포하고 있다. 따라서 ABM을 적용한 OPSim 개발 과정에서 빅 데이터를 활용한 AI기술, 자가진화 시뮬레이션 기법(self-evolving simulation), 시스템다이나믹스(system dynamics) 등을 활용하여 한계점을 보완할 수 있다(Scheutz et al., 2016; Kang et al., 2016; Bae et al., 2018; Kavak et al., 2018). Simulation derived from the Latin word "simulacre" for "artificial objects that actually do not exist" means the process of modeling a realistic state (system) to interpret complex problems and finding an optimal solution through repeated operations (Baudrillard, 1994). While a traditional analytical method defines the correlation of two variables (i.e., independent variables and dependent variables) through coefficient estimation, a simulation method aims to identify the process through the reproduction of phenomena. Therefore, a simulation technique is a more suitable methodology for identifying phenomena rather than finding an optimal solution. The problem of the natural system (e.g. landslides) is defined by simple and clear relationships between factors, but that of the human system (e.g. real estate prices) is defined by relatively complex and unclear relationships. Therefore, a policy as a means of solving social problems, primarily derived from human relationships, is suitable for applying a simulation technique. Simulation is a technology that meets these requirements well, as a policy addresses the procedure as important as the result, solving current and future problems, and considering both positive and negative effects. Recently, simulation technology has been used in various policy areas such as welfare for senior citizens (Baek, 2019), fine dust (Shim, 2019), housing market (Choi&Byun, 2016), and population census (Bae et al, 2016). Marine space policies based on the Marine Space Planning and Management Act, which was enacted in 2019, such as marine spatial basic and management plans, marine use zones, and marine space suitability consultations are new political tools for efficient use of marine resources and management of conflicts. As social use and conflicts such as maritime tourism, aggregate collection, off-shore wind power, and maritime border disputes have intensified recently, calls for effective marine spatial policies are increasing, and scientific tools are urgently needed to accurately evaluate marine policies. Since marine space is intertwined with complex interests such as the environment, ecosystem, community, fisheries, tourism, and energy development, a marine spatial policy support tool should define and consider these relationships for policy evaluation. This paper proposes Ocean Policy Simulator (OPSim) as a support tool for marine spatial policy. Specifically, we aim to highlight the usefulness of an agent-based model (ABM) to explore human-nature interactions (i.e., conflict or synergy) and to provide policy implications. Using an ABM for such purposes often meet the issues in regard to verification and validation of the model’s structures and outcomes. However, AI technology using spatiotemporal bigdata, self-evolution simulation techniques, and system dynamics can help to tackle validation and verification procedures in the development process of OPSim using ABM (Scheutz et al., 2016; Kang et al., 2016; Bae et al., 2018; Kavak et al., 2018).

온톨로지 계층관계를 이용한 서비스 발견 알고리즘

최원종(Wonjong Choi),양재영(Jaeyoung Yang),최중민(Joongmin Choi),조현규(Hyeonkyu Cho),조현성(Hyeonsung Cho),김경일(Kyungll Kim) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅰ

인터넷망의 지속적인 발달과 더불어 웹서비스가 차지하는 비중은 매우 커지고 있다. 이와 관련해 서비스 발견을 위한 다양한 노력들이 진행되었으며, 그 중에서도 DAML-S문서로 기술된 매치메이커에서 제시한 알고리즘은 서비스 발견자와 서비스 제공자사이의 서비스 발견에 대한 유사도 측정의 한 방법을 제시하고 있다. 하지만 온톨로지상의 관계표현에 있어 네 가지 규칙만을 적용하여 정밀한 유사도측정이 불가능하다는 단점이 있다. 따라서 본 논문에서는 기존의 알고리즘의 개선을 위해 두 가지 유사도 측정함수 1) 계층구조함수 2) 계층계수함수를 정의하고, 이에 기반한 새로운 서비스 발견 알고리즘을 제시하고자 한다.

Transportation of laboratory animals for animal welfare

Jaeyoung Choi(최재영) 한국실험동물학회 2020 한국실험동물학회 학술발표대회 논문집 Vol.2020 No.7

Early Infliximab Yields Superior Long-Term Effects on Linear Growth in Pediatric Crohn’s Disease Patients

( Jaeyoung Choi ),( Ben Kang ),( Min-ji Kim ),( Insuk Sohn ),( Hae Jeong Lee ),( Yon Ho Choe ) 대한간학회 2018 Gut and Liver Vol.12 No.3

Background/Aims: Information regarding the efficacy of early infliximab treatment in pediatric patients with Crohn’s disease (CD) is limited. We aimed to evaluate the impact of early combined immunosuppression on linear growth in pediatric patients with CD by performing step-up comparisons. Methods: This retrospective study included pediatric patients with moderate-to-severe CD, who received a combination therapy with infliximab and azathioprine for at least 3 years and sustained corticosteroid-free remission without loss of response. The z-scores of the growth indicators obtained at the time of diagnosis and annually for 3 years thereafter were compared between the two groups. Results: The early combined immunosuppression group displayed significantly increased linear growth 3 years after diagnosis (p=0.026). A significant difference was also observed in the linear growth 3 years after diagnosis between subgroups of Tanner stages 1-2 (p=0.016). Conclusions: The early introduction of biologics should be considered to improve linear growth in pediatric patients with CD. (Gut Liver 2018;12:255-262)

Genomic Insights into the Rice Blast Fungus through Estimation of Gene Emergence Time in Phylogenetic Context

( Jaeyoung Choi ),( Jong-joon Lee ),( Junhyun Jeon ) 한국균학회 2018 Mycobiology Vol.46 No.4

The rice blast fungus, Magnaporthe oryzae, is an important pathogen of rice plants. It is well known that genes encoded in the genome have different evolutionary histories that are related to their functions. Phylostratigraphy is a method that correlates the evolutionary origin of genes with evolutionary transitions. Here we applied phylostratigraphy to partition total gene content of M. oryzae into distinct classes (phylostrata), which we designated PS1 to PS7, based on estimation of their emergence time. Genes in individual phylostrata did not show significant biases in their global distribution among seven chromosomes, but at the local level, clustering of genes belonging to the same phylostratum was observed. Our phylostrata-wide analysis of genes revealed that genes in the same phylostratum tend to be similar in many physical and functional characteristics such as gene length and structure, GC contents, codon adaptation index, and level of transcription, which correlates with biological functions in evolutionary context. We also found that a significant proportion of genes in the genome are orphans, for which no orthologs can be detected in the database. Among them, we narrowed down to seven orphan genes having transcriptional and translational evidences, and showed that one of them is implicated in asexual reproduction and virulence, suggesting ongoing evolution in this fungus through lineage-specific genes. Our results provide genomic basis for linking functions of pathogenicity factors and gene emergence time.

Remediation of heavy metal using treatment agents for acid mine drainage

Jaeyoung Choi(최재영),Jung-Seok Yang(양중석),Ju Young Lee(이주영),Dongwook Kwon(권동욱) 한국지반환경공학회 2007 한국지반환경공학회 학술발표회논문집 Vol.2007 No.-

Kinetic Analysis of Electron Transport in Hot-cathode Penning Ionization Gauge Sources

Jaeyoung Choi,June Young Kim,Kyoung-Jae Chung,Y. S. Hwang 한국진공학회 2020 한국진공학회 학술발표회초록집 Vol.2020 No.2

Beliefs about English Learning and Teaching: From Teacher Learners’ Perspectives

Jaeyoung Choi 팬코리아영어교육학회(구 영남영어교육학회) 2006 영어교육연구 Vol.18 No.2

  This study investigated beliefs about English learning and teaching held by teacher learners1) who were studying to become secondary school English teachers in Korea. For the purpose, this study interviewed twenty teacher learners enrolled in a graduate program of English teacher education. The interviews were conducted as free conversation with a set of guiding topics and anticipatory questions. The total twenty hours of audio-taped data were produced from the interviews, and the data were made into non-verbatim transcripts. Through the procedure of multiple readings, multiple preliminary theme identifications, and checking subjects’ reactions, the themes emerged. The twenty teacher learners’ beliefs about English learning and teaching appeared to be strongly influenced by their past English learning experiences. At the same time, the beliefs seemed to reflect the subjects’ perception of the social context in which their English learning and teacher learning took place. The study suggests that teacher training programs provide more communication-centered English leaning opportunities for the teacher learners as a way of training them to be pro-communication English learners and teachers who would renovate Korean English education for the better.

A Survey on content-oriented networking for efficient content delivery

Jaeyoung Choi,Jinyoung Han,Eunsang Cho,Kwon, Ted,Yanghee Choi IEEE 2011 IEEE communications magazine Vol.49 No.3

<P>As multimedia contents become increasingly dominant and voluminous, the current Internet architecture will reveal its inefficiency in delivering time-sensitive multimedia traffic. To address this issue, there have been studies on contentoriented networking (CON) by decoupling contents from hosts at the networking level. In this article, we present a comprehensive survey on content naming and name-based routing, and discuss further research issues in CON. We also quantitatively compare CON routing proposals, and evaluate the impact of the publish/subscribe paradigm and in-network caching.</P>

Study on Improvement of Interface Properties in Al2O3/Si Structure Using SiO₂ Buffer Layers

Jaeyoung Choi,Do-yeon Kim,Sang-Ouk Ryu,Woo-ByoungKim 한국표면공학회 2017 한국표면공학회 학술발표회 초록집 Vol.2017 No.11