Earticle

이 논문은 세월호 사고와 같은 대형 참사가 발생하지 않도록 하기 위해 코어 시스템을 통해 국가위기관리시스템의 개선 방향을 제시하는데 목적이 있다. 코어 시스템은 하나의 전체 체계를 일정한 방향으로 지도하고 조정하는 네트워크의 중심(network hub)으로 정의할 수 있고 가치, 제도, 리더십, 헌신, 전문성을 주요 구성요소로 한다. 이러한 코어 시스템의 논의를 바탕으로 살펴 본 우리나라 국가위기관리시스템의 주요 문제점으로는 코어 시스템의 부재, 상황관리의 비체계성, 재난관리 기능의 미흡, 부처 간의 칸막이 효과로 인한 정책조율의 어려움, 과거로부터 학습하지 못하는 재난관리 등이 있다. 여기서는 향후 국가위기관리시스템의 발전을 위한 방안으로 ①국가위기관리 코어 시스템의 구축, ②파트너십을 지닌 국가위기관리 거버넌스 구축, ③지방자치단체 위기관리 역량 강화, ④지원-협력-연계-조정의 민주적 위기관리 업무 수행 방식의 채택, ⑤사회내장형 위기관리시스템의 구축, ⑥새로운 안전 인식과 문화의 제도화, ⑦지방자치단체 중심의 재난관리를 제시하였다.

The purpose of this study is to seek the core system of national crisis and emergency management system in Korea for the purpose of achieving the effective and efficient response mission. Core system can be defined as a network hub that leads and coordinates a entire system to a specific direction. This paper suggests five major elements which form a core system such as value, institution, leadership, devotion, and expertise. This research reveals several problems of national crisis and emergency management in Korea as follows; absence of core system, unsystematic situation control, inadequate disaster management function, difficulty of policy coordination from 'partition wall effect', non-learning disaster management from the past experience, and so on. This article suggests seven recommendations for improving the national crisis and emergency management in Korea as follows; (1) establishment of core system of national crisis and emergency management, (2) construction of national crisis and emergency management governance, (3) reinforcement of local government capacity for managing disaster, (4) development of democratic job performing mode like support-cooperation-network-coordination, (5) construction of the social-embedded crisis & emergency management system, (6) institutionalization of the new perception and culture of safety, and disaster management in local governments.

The purpose of this study is to seek for the core system in managing disasters: Failure of the Sewol disaster response system to manage crisis effectively and efficiently. This paper suggests five elements which form a core system as follows; value, institution, leadership, devotion, and expertise. First, it is the value that determine the direction of system operation in some situations like disaster, public issue, and events, etc. The fundamental problems of crisis and emergency management came from a lack of value and philosophy for disaster management in the case of Sewol ferry disaster. Second, for realizing the desirable value, a system has to make or build up an institution which can be accepted socially and legally by society members. In the case of disaster response in Korea, there are lots of ad hoc institutions of disaster response in the time of accident. Third, leadership is essential to the success of any system which should accomplish a common task. Government leaders dealing with catastrophic disaster, however, failed to work out a new framework to tackle catastrophic disasters. Fourth, devotion is a positively necessary element for completing the system's work. But disaster response actors did not get the devotion to their job and not receive training in maritime rescue operations. Finally, as jobs becomes more specialized, system become increasingly dependent on expertise to achieve goals. In the case of disaster management system, there was no expertise in the related and responsible government organizations.

본 연구의 목적은 코어시스템 접근을 활용하여 COVID-19 팬데믹 사례를 분석하고, 그 분석 결과가 재난에 대비하고 대응하는 지역사회의 재난 레질리언스 강화에 적용되는 것을 확인하는데 있다. 일반적으로 투입, 전환, 산출, 피드백으로 이루어진 시스템 모델에서 전환(conversion)과정이야 말로 하나의 시스템이 바람직한 산출을 확보하는데 있어서 가장 중요한 과정인데도 불구하고, 실제로는 블랙박스(black box)로 취급되어 연구 대상에서 벗어난다. 이 연구에서는 전환과정이 어떻게 기능해 야 바람직한 산출을 확보할 수 있는지를 살펴보기 위해 코어시스템 모델을 활용하였다. 코어시스템 은 가치를 중심으로 제도, 리더십, 헌신(팔로워십)과 전문성(역량)이 상호 연결되어 있으며 상호 의 존적이다. 구성요소들은 재난을 극복하기 위한 바람직한 지향성을 지닌다. 주요 결과는 다음과 같다. 첫째, 예방 및 대비 단계 활동에서의 의사소통과 전문적 경험을 바탕으로 “리더십”과 “전문성(역량)” 이 발휘되었다. 둘째, 의료진과 자원봉사단체, 공무원들의 “헌신(팔로워십)”과 “가치”는 독립적 사고 와 능동적 참여와 협력을 통해 더욱 긴밀해졌다. 셋째, ‘제도’ 측면에서는 위기상황에서의 개인방역 수칙은 마스크 착용, 밀접접촉과 모임을 절제하는 사회적 거리두기 행동의 준거가 되었다.

The purpose of this study is to analyze COVID-19 pandemic cases using the core system approach, and to confirm that the analysis results are applied to strengthening disaster resilience of communities to prepare for and respond to disasters. In this study, the core system model was used to examine how the conversion process must function to secure desirable output. In the core system, institutions, leadership, commitment (followership) and expertise (competence) are interconnected and interdependent based on values. The components have a desirable orientation for overcoming disasters. The main results are as follows. First, “leadership” and “expertise (competence)” were demonstrated based on communication and professional experience in the activities of the prevention and preparedness stage. Second, the “devotion (followership)” and “value” of medical staff, volunteer groups, and public officials became closer through independent thinking and active participation and cooperation. Third, in terms of ‘institution’, personal quarantine rules in a crisis situation became a reference for social distancing behaviors such as wearing a mask and refraining from close contact and gatherings.

현대 사회는 재난에 직면해서 재난 발생 이전상태로의 회복을 최소한의 목표로 하고 재난을 관리하게 마련이다. 그러나 재난에 직면하고 극복했던 경험을 가진 사회는 한층 더 발전된 모습으로 새로운 재난에 대비하고 보다 안전하고 지속가능한 사회적 역량을 꿈꾼다. 경험하지 못한, 그리고 예측하기 어려운 새로운 형태의 복잡하고 다양한 재난에 대한 사회적 회복역량 즉 재난 레질리언스는 지역사회가 지닌 인적, 제도적, 물적, 사회적 자본의 유기적 연결에 있고 이를 위한 재난관리시스템을 바람직한 방향으로 이끌어가는 핵심체계이면서 최소한의 구성요건인 코어시스템에 대한 연구의 필요성이 더욱 중요해진다. 코어시스템의 가치, 제도, 리더십, 팔로워십, 역량이 지역사회 재난 레질리언스의 강화에 어떠한 영향을 미치는지를 탐구하는 일은 결국 지역사회 역량을 재난관리에 집중하게 하여 회복과 적응·발전하게 하는 재난관리 시스템의 평가와 유용성을 판단하는 주요한 방안이 될 것이다.

When modern societies face disasters, the goal of restoring to a pre-disaster state is minimal and disaster management is essential. However, a society that has faced and overcome disasters is a more developed society that prepares for new disasters and dreams of a safer and more sustainable social capacity. Disaster resilience, which is social resilience against new, inexperienced, and unpredictable complex and diverse disasters, lies in the organic connection of human, institutional, material, and social capital in the local community and in the disaster management system. The need for research on the core system, which is a key inspection system leading in a desirable direction, is becoming more important. Exploring how the values, institutions, leadership, followership, and capacity of the core system affect the strengthening of community disaster resilience is ultimately a disaster that focuses community capacity on disaster management, resulting in recovery, adaptation, and development. It will be a major way to evaluate the management system and judge its usefulness.

이 연구의 목적은 코로나19 사태를 분석하여 국가위기관리시스템의 문제점과 개선방안을 찾는 것이 다. 코로나19(COVID-19) 사태에 대하여 코어시스템의 5가지 구성요소인 가치, 제도, 리더십, 헌신, 전문성으로 분석하였다. 제도 측면은 위기관리 4단계인 예방, 대비, 대응, 복구단계로 세분화하여 분석하였다. 우리나라의 위기관리시스템에 대한 개선방안은 ① 가치 측면에서 장례, 고비용 백신⋅ 치료제 등 감염병 위기 상황에서도 인간존중 가치가 구현되어야 하고, ② 예방 단계에서는 시군구에 감염병 관리 권한 확대 등 감염병예방법을 개정해야 하고, ③ 대비 단계에서 위기경보 수준을 상향 하도록 위기관리매뉴얼을 개정하고, ④ 대응 단계에서 신속한 전파, 투명한 공개, 과도한 정부 대응, 국민의 적극적 협조가 필요하다. ⑤ 복구 단계에서 의료기관에 대하여 실제 피해액을 보상하고, ⑥ 리더십 측면에서 중앙재난안전대책본부장은 국무총리로 하고 효과적인 수습이 필요한 경우 대통령 으로 상향하고, ⑦ 헌신 측면에서 감염병 확산 방지를 위해 정부, 국민, 기업 등 국민 모두의 헌신과 적절한 보상책이 마련되어야 한다. ⑧ 전문성 측면에서 디지털 기술을 활용한 감염자 진단 및 추적 장비 개발이 필요하다.

The purpose of this study is to find out the problems and improvement measures on the national crisis and emergency management system in South Korea through the core system. Based on the lesson from the COVID-19 disaster, this study analyzed the five major elements of a core system and four stages of crisis management model. The recommendations from this study are as follows; (① value) the value of human respect should be preserved during the pandemic, regarding funeral, high-cost vaccine and treatment, (② prevention) the Infectious Disease Control and Prevention Act should be revised in a way to expand the authority of local government for infectious disease management, (③ preparedness) the crisis management manual should be revised to raise the alert levels, (④ response) rapid propagation, transparent disclosure, excessive government response, active civic cooperation would be needed, (⑤ recovery) the actual amount of the damage to the medical institutions should be compensated, (⑥ leadership) the prime minister should serve as a head of the Central Disaster and Safety Countermeasures Headquarters, (⑦ devotion) country-wide dedication and commitment would be needed along with appropriate compensation system, and (⑧ expertise) rapid diagnosis, treatment and contact tracing using digital technology would be critical.

The purpose of this study is to seek the problem and improvement on the national crisis and emergency management system in Korea through the core system. Based on the lesson of the ASF disaster, this study analyzed the five major elements of the core system : value, institution, leadership, devotion, and expertise. This article suggests recommendations for improving the national crisis and emergency management in Korea as follows; (①value) promoting animal welfare certification policies to spread respect for life, following the method of killing with pre-trainingt, (②prevention) establishing a defense system with North Korea through international organizations, (③preparedness) unification of the crisis warning level in the manual and guidelines, and to raise the crisis warning level when ASF occurs in neighboring countries, (④response) promptly holding Animal Disease Control Council involving livestock farmers to seek expert advice and establish regulations on the extent of preventative killings. (⑤recovery) establishing compensation criteria, including the upper and lower limits for killing compensation, and supporting livelihood security funds before re-entry, (⑥leadership) change of national crisis management system to operate Central disaster and safety Countermeasure Headquarters in social disaster management agencies, (⑦devotion) strengthening disaster capacity of citizens and establishing a cooperative system among governments, corporations and civil society, (⑧expertise) modernization and specialization of livestock farms, expansion of inspection agencies and inspection personnel, expansion of vaccine research institutions and research personnel.

초록 close 이 논문의 목적은 지난해 발생한 세월호 침몰사고와 유사한 사고인 1993년 서해훼리호 침몰사고의원인과 대응과정의 문제점을 분석해 보고, 우리나라 위기관리시스템의 혁신방향을 알아보고자 하는데 있다. 시스템 이론에서 설명하는 투입 산출의 전환과정에 가치, 제도, 리더십, 헌신, 전문성의측면이 고려되어야 함을 강조하는 코어시스템은, 하나의 체계를 일정한 방향으로 지도하고 조정하는 역할을 하는 네트워크의 허브기능을 수행한다. 서해훼리호와 세월호 침몰 사고의 문제점 분석을코어시스템의 구성요소를 통하여 분석해 보고, 공통점과 차이점을 알아보았다. 이 과정에서 제도와리더십 전문성 부분에서 두 사건간 차이가 크게 발견되지 않은 가운데, 가치와 헌신의 영역에서세월호 사건 발생 시 서해훼리호 사건 당시 보다 낮은 인식수준이 발견되었다. 이를 통하여 그동안많은 위기관리시스템 개선에 관한 논의들이 간과하고 있었던 시스템의 전환과정을 코어시스템으로설명함으로써 앞으로 위기관리 시스템을 개선하기 위한 방향을 제시하고자 하였다.

This study aims to compare the causes and the responding processes of the Seohae Ferry (1993) and the Sewol Ferry (2014) sinking disasters in order to suggest directions for innovating crisis management systems in Korea. The concept of a core system is introduced for this aim, which is a network hub for guiding and coordinating systems to a certain direction with consistency. The core system is composed of value, institution, leadership, devotion, and expertise. Since this concept has been overlooked in the discussions on the improvement of crisis management systems, this study discusses its functions and roles. Based on the analysis of the problems in the operation of crisis management systems for the Seohae Ferry and Sewol Ferry accidents, the establishment of a core system is suggested as a measure of reforming the national crisis management systems in Korea.

The purpose of this study is to suggest a framework to implement SDGs (Sustainable Development Goals) by utilizing the transdisciplinary “crisisonomy” approach with the core system model and the concept of disaster resilience. The transdisciplinary “crisisonomy” consists of social activities which find and apply the solutions to social problems, science and technology innovation activities, and technology knowledge to solve problems. The core system model needs to be prepared through a transdisciplinary approach as follows. First, we must set a common goal as the value that society members agree on. Second, we need to provide implementing organizations with laws and guidelines to achieve the values expressed in vision, strategy and action plan. Third, leadership has to ensure that the efforts to implement the SDGs should be effective. Fourth, the successful implementation of the SDGs requires the devotion of ordinary citizens, practitioners, experts and leaders. Finally, we need the expertise in creating new knowledge for SDGs as well as the expertise in the cooperation of citizens and experts.

우리 사회는 대형 사건사고를 통하여 법제도적인 위험 대응시스템을 갖추고 있음에도 재난관리가 제대로 이루어지지 않고 있다. 코어시스템 이론은 시스템의 다양한 투입요소를 산출로 전환하는 과정인 전환과정을 구성하는 핵심체계에 주목하고 그 핵심체계의 요소로 가치, 제도, 리더십, 헌신, 전문성을 제시하였다. 제천의 화재사고를 사례로 코어시스템 모델을 이용해 재난관리 의 문제점과 대응방안을 살펴보았다. 제천참사는 화재에 취약한 건축구조물, 형식적인 화재안전관리 및 소방시설 점검, 부족한 인력과 장비, 불법 주정차, 상황실의 컨트롤타워 기능의 부재, 구호의무의 소홀, 전문성의 결여 등의 문제점이 확인됐다. 결국 안전의식의 결여, 법과 제도의 미비, 현장 지휘관의 리더십 부족 등 여러 요인이 복합적으로 작용해 발생한 인재이다. 따라서 어느 한 요소가 아닌 코어 시스템 전반에 걸쳐 종합적이고 입체적인 접근을 통하여 문제를 해결하여야 한다. 이를 위해서 법과 제도의 개선, 인력과 장비 확충을 위한 예산 지원, 시민들의 참여를 바탕으로 한 거버넌스적 협력체제 구축 등이 필요하며, 특히 지방자치단체의 역할이 중요하다.

Even t hough a response s ystem has been p repared to manage risks, why a re t he r isks n ot m anaged p roperly and major disasters repeated? We analyzed the fire disaster in Jecheon sports center using the Core System Model to see why. According to the analysis, problems such as building structure vulnerable to fire, perfunctory fire safety management and inspection of firefighting facilities, insufficient personnel and equipment, illegal parking vehicles, lax management of situations, neglect of relief duties and lack of professionalism were identified. The Jecheon fire disaster is a man-made disaster caused by a combination of factors, including a lack of safety awareness, lack of law and system, and lack of leadership by field commanders. Therefore, problems should be solved through a comprehensive, three-dimensional approach across the core system, not by one component. In particular, the role of local governments is important, such as the improvement of laws and systems, the support of budgets to expand manpower and equipment, and the establishment of a governance cooperative system based on citizens' participation.

이 연구는 대학 캠퍼스에서 발생하는 안전사고 중 교통사고의 발생 원인을 살펴보고 문제점과 개선방안을 제시하는 데 목적이 있다. 현재 대학 캠퍼스에서는 자동차, 오토바이, 전동 킥보드 등의 주행이 많아짐에 따라 교통사고 발생이 빈번해지고 있다. 그러나 대학 캠퍼스에서 발생한 교통사고의 경우 도로교통법 미적용으로 인해 통계에서 제외되어 실태파악이 어려우며, 캠퍼스 내에서도 크게 이슈화하지 않음에 따라 캠퍼스 내 교통사고의 위험성 인식이 매우 미흡한 실정이다. 이에 따라 본 연구에서는 캠퍼스 안전에 대해 정의하고, 국내 대학 캠퍼스 교통사고 사례를 코어시스템 모형을 통해 문제점과 개선방안을 제시하고자 하였다. 코어시스템 모형을 통한 대학 캠퍼스 내 교통사고의 문제점 시사는 구성원들에게 위험을 인지시키고, 캠퍼스 존의 안전관리 시스템 을 위한 방안을 제시한다는 점에 의의가 있다.

The study is aimed at examining the cause of traffic accidents among safety accidents occurring on university campuses and presenting problems and ways to improve them. Currently, traffic accidents are more frequent on university campuses as more cars, motorcycles and electric kickboards are being driven. However, the awareness of the danger of traffic accidents on campus is very poor as traffic accidents on university campuses are excluded from the statistics due to the absence of the Road Traffic Act and are not highly controversial on campus. Accordingly, this study defined campus safety and presented problems and improvement measures through the core system model of the accident case on the university campus in Korea. The problem of on-campus traffic accidents through the core system model is significant in that the test informs the members of the danger and suggests measures for the safety management system in the campus zone.

This study compared the Sewol Ferry sinking accident that happened last year with that of Seohae Ferry in 1993 in order to suggest directions for innovating of crisis management systems in Korea. To accomplish For this purpose, the introduction of the core system was introduced. The core system is a network hub for guiding and coordinating systems in a certain direction consistently. As its components, the core system has value, institution, leadership, devotion, and expertise. By explaining the transition process of transition of a system, which has been overlooked by discussions on the improvement of crisis management systems, using the core system, this study aimed to find its functions and roles. In this discussion, problems in the operation of crisis management systems for the Seohae Ferry and Sewol Ferry accidents were analyzed from the viewpoints of the components of the core system, and the establishment of a core system was suggested as a method of reforming the national crisis management systems.

Purpose: This study aimed to examine the relationship between future core nursing competencies and key variables, identifying factors influencing these competencies among senior nursing students. Methods: This cross-sectional study included 150 third- and fourth-year nursing stu- dents in South Korea. Based on King’s Dynamic Interaction System Model, perceived work value and individual innovative behavior were categorized as personal systems, interpersonal competence as an interpersonal system, and adhocracy culture as a social system. Participants completed self-reported online questionnaires to assess factors influ- encing future core nursing competencies. Results: Hierarchical multiple regression analysis identified interpersonal competency (β=0.32, p=.012) and adhocracy culture (β=0.23, p=.010) as significant predictors of future core nursing competency explaining 30.9% of the variance. Conclusion: Enhancing future core nursing competency among senior nursing students requires continuous education and counseling programs to strengthen interpersonal competency. Establishing an adhocracy culture involves recognizing creative ideas, fos- tering open communication for freely expressing ideas, and encouraging innovation. Therefore, developing interpersonal competence and promoting an adhocracy culture is essential for improving future core nursing competency in senior nursing students.

Government capacity implies the quality of being capable, and are very important for executing the political will, especially in the extremely situation, such as in crisis and emergency, and among the capabilities, core capability determines the success or not of the disaster relief and reduction. Core capability mostly depends on the emergency management system is an integrated model or segregated model. The emergency management systems of Korea and US are integrated one and China’s system is segregated one. Based on the analysis of Chinese government disaster reduction system, this study compared the China’s Eastern Star cruise ship wreck accident and Korea’s Sewol sank accident, which both killed hundreds of people, we can see that China’s disaster reduction was much more efficient and effective than Korea did. The main reason is China has a much stronger control ability than Korean government, which make a good cooperation among agencies at the state level, between central government and local government, and among agencies at local level. Through the study, we can see that the Chinese political system gives the government a very strong control ability, that is the core competitiveness of Chinese disaster management cooperation system. That is to say that successful disaster management needs successful cooperation among government agencies, cooperation needs the control ability, the control ability needs the political system to give guarantee.

The promulgation of the overall framework of Chinese students' development of core literacy has made the implementation of core literacy into specific teaching activities an urgent problem to be solved in the field of education. Based on the analysis of the problems existing in the undergraduate education under the mode of emphasizing theory and neglecting practice, this paper constructs the practical teaching system of Database Principle Course Based on the core quality, expounds the implementation strategy of practical teaching, and probes into how to train the students in the practical teaching of database principle Cultivate scientific spirit, learning ability, practical innovation, responsibility and other core literacy. After 5 rounds of practice, students have achieved better development in independent development and collaborative work, and their awareness of practical innovation has been significantly improved.

연구목적: 본 연구는 암 간호정보체계에 사용될 한국 6대 암 환자의 핵심간호진단을 결정하기 위해 수행되었다. 핵심간호진단 은 6대 암, 각 환자 군의 간호를 위해 가장 자주 혹은 많이 사용되는 일정의 간호진단 세트로 정의된다. 본 연구에서 6대 암 환자의 핵심간호진단을 결정하고자 하는 가장 큰 목적은 간호진단 과정에서의 편리성을 높임으로써 앞으로 개발될 암 간호정보체계의 유용성과 사용가능성을 높이기 위함이다. 연구방법: 핵심간호진단은 조사연구를 통해 결정하였으며, 결정된 진단들은 문헌고찰과 환자기록 분석을 통해 그 타당도를 확인하였다. 환자기록 분석은 특히 조사연구 결과의 타당도를 확인하기 위해 사용되었다. 조사연구에 사용된 도구 및 환자기록에 나타난 간호진단 혹은 간호문제의 교차분석을 위해서는 NANDA Taxonomy II에 포함된 간호진단이 사용되었다. 219명의 경력간호사가 조사연구에 참여하였으며, 72개의 환자기록이 분석되었다. 핵심간호진단은 암 간호 정보체계의 언어개발을 위해 구성된 전문가 집단에 의해 조사연구 참여자의 20% 이상이 선택한 NANDA 간호진단으로 정하였다. 연구결과: 16개 ${\sim}$ 20개의 NANDA 간호진단이 한국 6대 암, 각 환자군의 핵심간호진단으로 선정되었다. 핵심간호진단 중 '급성통증', '만성통증', '불안', '감염가능성', '피로' 등이 6대 암 환자 군에 모두 포함되었다. 결론: 핵심간호진단의 타당도는 환자기록 분석과 문헌고찰을 통해 확인되었다. 이들 핵심진단은 암 간호정보체계에 사용되어 간호진단 적용을 촉진함으로써 암 환자 간호의 질 향상에 기여할 수 있을 것이다.

본 연구의 목적은 CAD/CAM 시스템을 이용하여 지르코니아 코어를 제작한 다음 span의 길이가 변연 적합도에 미치는 영향과, 변연 간격이 임상적으로 허용 가능한 범위 내에 있는지를 평가하였다. 실험군은 지르코니아 single crown, 2-unit bridge, 3-unit bridge, 4-unit bridge의 4그룹으로 나누고 각 그룹별로 10개씩 코어를 제작하였다. 평균 변연 간격은 single $42.95{\pm}6.93{\mu}m$, 2-unit $43.53{\pm}5.27{\mu}m$, 3-unit $53.43{\pm}13.38{\mu}m$, 4-unit $50.85{\pm}8.25{\mu}m$으로 나타났다. 근심면, 원심면에서는 single, 2-unit 그룹과 3-unit, 4-unit 그룹 간 span의 길이 요인에 따라 통계학적으로 유의한 차이가 있는 것으로 나타났다(p<.05). 협면, 설면에서는 모든 그룹에서 span의 길이 요인에 따라 통계학적으로 유의한 차이가 없었다(p>.05). 이러한 결과는 지르코니아 코어의 span 길이가 변연 적합도에 영향을 주었고, 변연간격은 모든 그룹에서 임상적 허용 범위 내에 존재 하였다.

The purpose of this study was to evaluate the marginal fitnesses on the effect of span length of bridge and the marginal gaps within the clinically allowed range. The samples were fabricated with zirconia core using CAD/CAM system. The test groups were divided by four groups, single crown, 2-units bridge, 3-units bridge and 4-units bridge and 10 zirconia cores per each group. The results of mean marginal gaps were $42.95{\pm}6.93{\mu}m$ in the single crown, $43.53{\pm}5.27{\mu}m$ in 2-unit, $53.43{\pm}13.38{\mu}m$ in 3-unit, and $50.85{\pm}8.25{\mu}m$ in 4-unit on each. The marginal gap of mesial and distal surfaces were statistically significant differences between single, 2-unit group and 3-unit, 4-unit group (p<.05) and this results was effected by the span length. The buccal and lingual surfaces were no statistically significant differences within all groups(p>.05). From this results the span length of the zirconia core may have influence on marginal fitness and the marginal gaps were within the clinically allowed range.

가스하이드레이트 개발 시 감압법 적용에 따른 생산효과 분석을 위해 생산모사 실험과 전산수치 해석을 연계한 연구가 필요하다. 이 연구에서는 생산경향과 가스하이드레이트 해리거동에 대한 감압율의 영향을 파악하고자코어스케일 실험시스템의 조건을 반영한 전산수치 모델을 구축하였다. 실험결과와의 비교로 검증한 전산수치 모델을 활용하여 감압율의 영향을 분석하였다. 그 결과 감압율이 클수록 가스하이드레이트 해리 속도가 빨라져 생산 시작및 해리 완료 시점이 앞당겨졌다. 또한 특정 감압율 이상에서는 압력 전파가 지연되었다. 감압율 및 가스하이드레이트포화율이 클수록 생산지점과 실험시스템 경계에서의 압력차이가 증가함을 파악하였다. 이 연구 결과는 감압법을적용한 현장 시험생산 계획 수립에 기초자료로 활용 가능할 것이다.

A numerical analysis integrated with the production experiment is required to analyze the effect of depressurization on the production of gas hydrate(GH). In this study, a numerical simulation model considering condition of a core scale experimental system was constructed to understand the depressurization rate effect on the production trend and GH dissociation behavior. The model was validated by comparing with the experimental results and used to analyze depressurization rate. The faster GH dissociation rate as the depressurization rate is increased, which results in the earlier beginning of the production and completion of the dissociation. The pressure propagation was delayed above the specific depressurization rate. The pressure difference between the production point and the experimental system boundary was greater as the depressurization rate and GH saturation is higher. This results can be used as the basic data for establishing the field production test plan using depressurization.