• 전기학회논문지
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• 제68권1호
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• pp.27-35
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• 2019

There is a growing interest in various microgrid solutions that supply electricity 24 hours a day to off-grid areas where are not connected with the main grid, and Korea has many positive effects by constructing overseas microgrids as a country operating the emission trading scheme. Since it is not clear how to obtain load curves that is one of the inputs of the HOMER used to design a microgrid optimization plan, or it is necessary to examine whether electricity is supplied to the peak load level of the areas where have not received the electricity benefits from the viewpoint of the demand management, a methodology should be developed to know the load composition ratio and the shape of the daily load curve. In this paper, the relative coefficient and average load information for each load group obtained from the survey are used besides peak load and total average load. A mathematical model is proposed to derive the load composition ratio in the form of a Quadratic Programming and the load forecasting is performed using simple linear regression with future indicators. The effectiveness of the proposed method is confirmed for the Philippine island region supported by Korea Energy Agency and the Asian Development Bank.

• 자원ㆍ환경경제연구
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• 제28권1호
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• pp.39-59
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• 2019

DMZ는 반세기 이상 인위적 활동이 배제되어 우수한 생태계를 보유하고 있다. 통일 이후에도 DMZ의 생태계는 보전되어야 하며 이를 위해서는 남북한 통일 이후가 아니라 사전에 그 보전방안이 마련되어야 한다. DMZ 생태자원 보전에는 생태자원 관리 비용 뿐만 아니라 복구비용 및 연구예산까지 수반되어야 하므로 상당한 규모의 예산이 필요하다. 이에 본 논문은 실물옵션과 경매이론을 연계하여 경제적 인센티브 메커니즘을 이용한 DMZ 보전기금 확보 방안을 연구하고자 한다. 다수의 사업자들은 경매를 통해 북한지역 개발사업권을 획득하려고 하고, 매몰비용에 대한 사적 정보를 가지고 있으며, 사업수익의 일부를 보전기금으로 지불한다고 할 때, 먼저, 경매 참가자의 최적 투자시기를 결정하는 실물옵션 모형을 분석하고, 다음으로 베이즈 내쉬균형을 이용해 경매 참가자가 사적 정보에 대해 진실을 보고할 경매를 설계한다.

• 기록학연구
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• 제4호
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• pp.63-91
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• 2001

This study is intended to examine the existing condition of records and archives management and seek its improvement and progress on a concrete model of Daejon Diocese as a kind of case study, because it is necessary to recognize the importance of records and archives management and to develop the records and archives management system. Daejon Diocese which has the catholic jurisdiction covering the areas of Daejon city and Chung Cheong Nam - Do province, celebrated the 40th anniversary of the diocese in 1998. At that, time, the authority of Daejon Diocese claimed to establish its church history institution and to plan the publication of "40 years history of Daejon Diocese". However, its publication could not be achieved until now for several reasons. Since my search for the cause of this situation, I immediately recognized that the lack of materials might be a common condition in almost all of the associations, especially with respect to management, preservation and access of the records and archives. The records in the archival repository of Daejon Diocese have been considerably lost because of the past intemperate destruction and these records have just piled for long time without any reasonable disposal programme. Therefore, in these poor conditions, it is inevitable to delay the publication of "40 years history of Daejon Diocese." This thesis deals with the archival arrangement and the ways of improvement by means of studying the records and archives management, as the essential issues. The archival arrangement based on the principle of provenance, the date of creation, and form division. The methods of improvement include the preservation environment, the scope of archives, archival staff, disposal and so on. Records have the legal and social value after being produced and they can remain as historical and cultural inheritances under the excellent condition of management and preservation. However, in examining the case of the management and preservation of records and archives in Daejon Diocese, I understand that it will need considerable time, man power, and financial cost in order to maintain the desirable level of records and archives management system Therefore, it is a important step for Catholic Daejon to recognize the necessity of the change over records and archives management.

• 대한건축학회논문집:계획계
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• 제34권1호
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• pp.83-94
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• 2018

UNESCO has continued to work in Africa, especially in the six southern sub-Saharan countries, and Asia, where international cooperation is needed. The CLC (Rwanda Community Learning Center) covered in this study aims to create a regional learning center in Rwanda and to recover local communities and provide learning environment. During the course of this study, we conducted field trips for actual planning and reviewed the current state of educational and cultural facilities that recently opened and are operated, and found implications. In consultation with the Rwandan Educational Commission, the site for CLC was decided, the building was designed, and the construction is about to start. The results of this study are as follows. First, in addition to the efforts of the activists in the village, which can be considered the smallest unit of a local community, the approach for establishing an architectural space and active education and community environment can be evaluated as a result of experimental efforts. Second, we can pay attention to the attempts to realize local communities. The bridge business is based on the multi-purposes such as early childhood education, technical education for adults, and community restoration of local residents and it reflects space and program plans for this purposes. It also reflects detailed plans such as differentiating the flow planning depending on users' time of use. Third, we can explain the characteristics of architectural planning considering local characteristics such as active use of local materials. Due to the characteristics of a developing country, there were significant considerations on maintenance, and to this end, the plan included plans for the environment and use of materials that are easily maintained. In addition, the participation of local residents in the process of establishment was suggested as a possibility to serve an educational role.

• 디지털융복합연구
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• 제19권2호
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• pp.397-402
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• 2021

본 연구는 설문을 통해 애슬레저 브랜드 커뮤니티 사용자 경험 만족도를 세대별로 측정하고 세대별 소비 취향에 따른 만족 요인을 도출하는 데 목적이 있다. 브랜드 커뮤니티 측정 도구는 스티븐 앤더슨(Stephen P. Anderson)의 감성 인터페이스 모형을 중심으로 작성된 설문지를 사용했고, 주요 수요층인 10대-40대의 여성을 중심으로 설문을 시행하였다. 설문 결과 세대별 소비성향에 따라 커뮤니티 참여율과 만족도 요인이 유의미하게 다르게 나타남을 추론할 수 있었다. 또한 태스크 중심의 만족도는 높았으나 경험 위주의 만족도는 비교적 낮은 결과가 도출 되었는데 이는 향후 온·오프라인 커뮤니티 활성화를 위한 경험 위주의 만족도 향상의 제고 방안이 필요함을 알 수 있었다. 본 연구를 통해 도출된 세대별 소비 취향에 따른 만족도 요인이 향후 세분된 수요자 중심의 브랜드 커뮤니티 연구의 자료로써 활용되길 기대한다.

• Journal of Multimedia Information System
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• 제9권2호
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• pp.145-154
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• 2022

The authors are making a prototype flexible board of a radio-frequency transmitter for measuring an electromyogram (EMG) of a flying moth and plan to apply for an experimental station license from the Ministry of Internal Affairs and Communications of Japan in the summer of 2022. The goal is to create a continuous low-dose exposure standard that incorporates scientific and physiological functional assessments to replace the current standard based on lethal dose 50. This paper describes the technical evaluation of the hardware. The signal of a bipolar EMG electrode is amplified by an operational amplifier. This potential is added to a voltage-controlled crystal oscillator (27 MHz, bandwidth: 4 kHz), frequency-converted, and transmitted from an antenna about 10 cm long (diameter: 0.03 mm). The power source is a 1.55-V wristwatch battery that has a total weight of about 0.3 g (one dry battery and analog circuit) and an expected operating time of 20 minutes. The output power is -7 dBm and the effective isotropic radiated power is -40 dBm. The signal is received by a dual-whip antenna (2.15 dBi) at a distance of about 100 m from the moth. The link margin of the communication circuit is above 30 dB within 100 m. The concepts of this hardware and the measurement data are presented in this paper. This will be the first biological data transmission from a moth with an official license. In future, this telemetry system will improve the detection of physiological abnormalities of moths.

• 한국정보통신학회논문지
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• 제26권8호
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• pp.1205-1212
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• 2022

산업제어시스템 (ICS)을 공격 대상으로 하는 사이버 보안 위협들이 지속적으로 증가하는 추세이며 특히 발전, 가스, 정유 시설과 같은 국가 기반시설에서 발생할 수 있는 사이버 보안 사고는 인명 손실 및 대형 화재와 같이 재난 수준의 사고로 이어질 수 있다. 제어시스템을 목표로 하는 사이버 공격에 효과적으로 대응하기 위해서는 ICS 환경을 고려한 다 계층 방어 전략이 필요하며, 특히 제어 망과 IT 환경에서 발생하는 보안 로그들을 통합된 환경에서 운영하는 전략은 기반시설 침해사고 대응에 있어 효과적인 역할을 한다. 본 연구에서는 제어 망에서 발생하는 보안 로그들을 IT 환경에서 운영하는 SIEM (Security Information and Event Management)으로 전송 하는 방법으로 OPC 프로토콜을 활용하는 방안을 소개하고, 이를 통하여 IEC 62443에서 정의하는 제어시스템 전 계층 (Level 0 ~ Level 4)에서 발생하는 이벤트를 통합할 수 있는 보안 로그 서버 구축 방안을 제시한다.

• Journal of Periodontal and Implant Science
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• 제51권4호
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• pp.285-295
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• 2021

Purpose: The aims of the present study were 1) to quantitatively evaluate the extent of sinus pneumatization and 2) to determine the factors affecting sinus pneumatization. Methods: Based on implant treatment records, a list of patients who underwent implant placement on the posterior maxilla was obtained. Among them, patients with pre-extraction and post-extraction (before implant placement) panoramic radiographs were selected. After excluding radiographs with low resolution and image distortion, the radiographs before and after extraction were superimposed using computer software. Subsequently, the extent of sinus pneumatization (the vertical change of the sinus floor) was measured. Simple and multiple mixed models were used to determine the factors affecting sinus pneumatization. Results: A total of 145 patients were eligible for the present investigation. The average extent of sinus pneumatization was 1.56±3.93 mm at 176 tooth sites. Male sex, single tooth extraction, extraction of an endodontically compromised tooth, a class I root-sinus relationship, and sinus membrane thickening >10 mm favored pneumatization, but without statistical significance. The maxillary second molar presented the greatest pneumatization (2.25±4.39 mm) compared with other tooth types. This finding was confirmed in the multiple mixed model, which demonstrated a statistically significant impact of the extraction of a second molar compared with the extraction of a first premolar. Conclusions: Maxillary sinus pneumatization was 1.56±3.93 mm on average. The extraction of a second molar led to the greatest extent of pneumatization, which should be considered in the treatment plan for this tooth site.

• 지식경영연구
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• 제23권2호
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• pp.61-82
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• 2022

메타버스는 Meta(초월)와 Universe(현실세계)의 합성어로 사용자 혹은 아바타가 사회, 경제, 문화적 활동을 하는 세계를 말한다. 본 연구는 Acceleration Studies Foundation(ASF)가 제시한 4가지 세계관(증강현실, 라이프로깅, 미러월드, 가상세계)에 대하여 고객 경험 촉진 요인인 SPICE의 5가지 평가요소를 기준으로 상호 비교해보고자 하였다. 227개의 표본을 분석에 사용하였으며 그 결과 증강현실에서는 연속성, 라이프로깅에서는 상호운영성, 거울세계에서는 실재감, 가상현실에서는 동시성이 가장 높은 것으로 나타났다. 본 연구는 메타버스 플랫폼 분류와 세계관에 따른 모형 설계 방안을 제시하고, 기존 메타버스 플랫폼 운영자 또는 신규 진입자에게는 이에 따른 세부적인 전략적 방향성을 제시한다는 점에서 의의가 있다.

• 한국안전학회지
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• 제37권5호
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• pp.80-88
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• 2022

The Korean nuclear industry had developed the SPACE (Safety and Performance Analysis Code for nuclear power plants) code, which adopts a two-fluid, three-field model that is comprised of gas, continuous liquid and droplet fields and has the capability to simulate three-dimensional models. According to the revised law by the Nuclear Safety and Security Commission (NSSC) in Korea, the multiple failure accidents that must be considered for the accident management plan of a nuclear power plant was determined based on the lessons learned from the Fukushima accident. Generally, to improve the reliability of the calculation results of a safety analysis code, verification is required for the separate and integral effect experiments. Therefore, the goal of this work is to verify the calculation capability of the SPACE code for multiple failure accidents. For this purpose, an experiment was conducted to simulate a Control Element Drive Mechanism (CEDM) break with a safety injection failure using the ATLAS test facility, which is operated by Korea Atomic Energy Research Institute (KAERI). This experiment focused on the comparison between the experiment results and code calculation results to verify the performance of the SPACE code. The results of the overall system transient response using the SPACE code showed similar trends with the experimental results for parameters such as the system pressure, mass flow rate, and collapsed water level in component. In conclusion, it can be concluded that the SPACE code has sufficient capability to simulate a CEDM break with a safety injection failure accident.