[이슈포커스] 4차 산업혁명과 속도의 시대

조정훈 대한전기협회 2017 전기저널 Vol.- No.483

황사연무통합예측모델 예측성 향상을 위한 에어로졸광학두께 자료동화체계 개발

조정훈,이희춘,홍승규,이상삼,임윤규 한국기상학회 2018 한국기상학회 학술대회 논문집 Vol.2018 No.10

세부 동작 기반 사물인터넷 서비스 분류 기법 개발

조정훈,이화민,이대원 한국인터넷정보학회 2018 인터넷정보학회논문지 Vol.19 No.2

Recently, through the emergence and convergence of Internet services, the unified Internet of thing(IoT) service platform have been researched. Currently, the IoT service is constructed as an independent system according to the purpose of the service provider, so information exchange and module reuse are impossible among similar services. In this paper, we propose a operation based service classification algorithm for various services in order to provide an environment of unfied Internet platform. In implementation, we classify and cluster more than 100 commercial IoT services. Based on this, we evaluated the performance of the proposed algorithm compared with the K-means algorithm. In order to prevent a single clustering due to the lack of sample groups, we re-cluster them using K-means algorithm. In future study, we will expand existing service sample groups and use the currently implemented classification system on Apache Spark for faster and more massive data processing. 최근 사물인터넷 서비스의 등장 및 융합으로 통합 사물인터넷 서비스 플랫폼에 관한 다양한 연구가 진행되었다. 현재 사물인터넷서비스는 서비스 제공자의 목적에 따라 독립적인 시스템으로 구축되어 유사한 서비스를 제공하는 서비스 간의 정보 교환 및 모듈재사용이 불가능 하였다. 이에 본 연구에서는 통합 사물인터넷 플랫폼 환경을 제공하기 위하여 다양한 서비스들의 세부 동작 기반서비스 분류 알고리즘을 제안한다. 구현을 통하여 상용화된 100여개의 사물인터넷 서비스를 분류 및 군집화를 진행하였으며 이를기반으로 K-means알고리즘과 비교하여 제안하는 알고리즘의 성능을 평가하였다. 또한 표본 집단의 부족으로 발생하는 단일 클러스터를 방지하기 위하여 K-means 알고리즘을 활용하여 재 군집화를 진행하였다. 향후 연구로 기존의 서비스 표본 집단을 확대하고 현재 구현한 분류 시스템을 보다 빠르고 대량의 데이터 처리를 위하여 스파크를 활용할 예정이다.

마이크로모빌리티 이용 패턴에 관한 비교 연구 : 서울의 공공자전거와 공유전동킥보드 사례를 중심으로

조정훈,함승우,김동규 한국ITS학회 2020 한국ITS학회 학술대회 Vol.2020 No.11

Emerging Technologies for Sustainable Smart City Network Security: Issues, Challenges, and Countermeasures

조정훈,Pradip Kumar Sharma,Jose Costa Sapalo Sicato,박종혁 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.4

The smart city is one of the most promising, prominent, and challenging applications of the Internet of Things(IoT). Smart cities rely on everything connected to each other. This in turn depends heavily on technology. Technology literacy is essential to transform a city into a smart, connected, sustainable, and resilient city whereinformation is not only available but can also be found. The smart city vision combines emerging technologiessuch as edge computing, blockchain, artificial intelligence, etc. to create a sustainable ecosystem by dramaticallyreducing latency, bandwidth usage, and power consumption of smart devices running various applications. Inthis research, we present a comprehensive survey of emerging technologies for a sustainable smart city network. We discuss the requirements and challenges for a sustainable network and the role of heterogeneous integratedtechnologies in providing smart city solutions. We also discuss different network architectures from a securityperspective to create an ecosystem. Finally, we discuss the open issues and challenges of the smart city networkand provide suitable recommendations to resolve them.

기술교과 예비교사의 사물 인터넷 교육을 위한 ESP8266기반 체험 프로그램 개발

조정훈,이용진 한국기술교육학회 2020 한국기술교육학회지 Vol.20 No.2

The purpose of this study is to develop a systematic and balanced Internet of Things(IoT) experience program of technology subjects with ESP8266 for pre-teacher. To achieve the purpose of the study, this study was carried out in the stages of preparation, development and improvement. In the preparatory stage, the curriculum, teacher qualifications, and textbooks were identified and the core functions of IoT were derived from related research. It was also confirmed that the experience program can be developed with ESP8266. In the development phase, experts were evaluated to develop experience programs by selecting appropriate topics and contents with the core functions of IoT. In the improvement phase, on-site classes were conducted and evaluated for pre-teachers, and the development of experience programs was completed by supplementing the results. The results obtained in the course of this study are summarized as follows: First, the study analyzed the usage tools in the study on IoT education and confirmed that ESP8266 is available for IoT education. Second, in this study, keyword analysis was conducted to derive sensing function, communication function, operation function and convergence function, which are the core functions of the IoT. Third, based on the core functions of the IoT, an experience program consisting of 12 kinds of learning topics from 16 series has been developed. Fourth, as a result of applying field classes to prospective teachers, the developed experience program has the effect of allowing prospective teachers to experience the IoT. 이 연구의 목적은 기술교과 예비교사를 대상으로 체계적이고 균형적인 사물 인터넷 교육을 위한 ESP8266 체험 프로그램을 개발하는 것이다. 연구의 목적을 달성하기 위해서 이 연구는 준비 단계, 개발 단계, 개선 단계의 순서로 진행하였다. 준비 단계에서는 교육과정, 기술교과 교사 자격기준, 기술·가정 교과서를 확인하고 관련 연구를 분석하여 사물 인터넷의 핵심기능을 도출하고, 사물 인터넷의 핵심 기능이 ESP8266으로 구현 가능한지 확인하였다. 개발 단계에서는 준비 단계에서 도출한 사물 인터넷 핵심 기능을 바탕으로 기술교과 예비교사에게 적합한 체험 프로그램 학습 주제와 학습 내용을 선정하였다. 선정된 학습 주제와 학습 내용에 따라 체험 프로그램을 개발하고 전문가 평가를 하여 체험 프로그램을 수정 및 보완하였다. 개선 단계에서는 예비교사를 대상으로 개발된 체험 프로그램의 현장 수업을 시행하고 학습자인 예비교사의 평가 결과를 바탕으로 프로그램을 수정 보완하여 최종 체험 프로그램을 완성하였다. 이 연구 과정으로 얻은 결과를 요약하면 아래와 같다. 첫째, 이 연구에서는 사물 인터넷 교육 관련 연구에서 사용 도구를 분석하여 ESP8266을 사물 인터넷 교육에 사용 가능한지 확인하였다. 둘째, 이 연구에서는 사물 인터넷 관련 키워드 분석을 하여 사물 인터넷 핵심 기능으로서 센싱 기능, 통신 기능, 작동 기능, 융합 기능을 도출하였다. 셋째, 이 연구에서는 사물 인터넷의 핵심기능을 바탕으로 16차시로 이루어진 12종의 학습 주제로 구성된 체험 프로그램을 개발하였다. 넷째, 체험 프로그램을 예비교사 대상으로 현장 수업을 적용한 결과 개발된 체험 프로그램이 예비교사가 사물 인터넷을 체험하는데 효과적인 것으로 나타났다.

ISO 13790과 ISO 52016에 의한 월별 난방에너지 소요량 분석

조정훈,윤근영 한국태양에너지학회 2019 한국태양에너지학회 논문집 Vol.39 No.5

Governments are increasing energy efficiency in buildings through various policies to reduce building energy consumption. In 2002, the European Union adopted a building energy performance guideline to set minimum efficiency standards for residential and commercial buildings. Starting in 2020, all EU member states should ensure that all buildings are Near-Zero Energy Buildings (NZEB). In Korea, the government issued a zero-energy certification system. Since 2020, public buildings are required to cover energy consumption with the energy produced in buildings. As the demand for building energy simulation has increased to increase the energy efficiency of these buildings, the International Standard Organization (ISO) has created a standard for calculating building energy requirements called ISO 13790. This standard was revised to ISO 52016 in 2017. In this research, ISO 13790, which calculates the energy needs of existing buildings, and ISO 52016, which replaces them, are compared and analyzed, and applied to the calculation of heating energy needs of buildings. For models without thermal zoning(Case A), the difference in annual heating energy needs calculated from each criterion is 1.08 kWh/m2, which is about 2% higher in ISO 52016. In the case of the thermal zoning model(Case B), the difference in annual heating energy needs calculated by each standard was 0.97 kWh/m2, which was about 2% higher than ISO 52016. The heating energy needs model without thermal zoning has a higher energy needs than the heating energy needs model with thermal zoning. It is about 16% energy at 8.58 kWh/m2 for ISO 13790 and 8.69 kWh/m2 for ISO 52016.

MEMS 추력기용 단일추진제 촉매 반응장치의 제조공정

조정훈,이대훈,권세진 한국항공우주학회 2002 한국항공우주학회 학술발표회 논문집 Vol.- No.-

사상체질분류검사(QSCC II)의 재현성에 관한 연구

조정훈,이창훈,장준복,이경섭,황덕상,Cho, Jung-Hoon,Lee, Chang-Hoon,Jang, Jun-Bock,Lee, Kyung-Sub,Hwang, Deok-Sang 대한한의학회 2006 대한한의학회지 Vol.27 No.3

Purpose: This study was conducted to investigate the reproducibility of responses to the QSCC II. Methods: Subjects have been tested by QSCC II for 2 or 3 successive years in Kangnam Korean Hospital at Kyunghee University from January 2002 to December 2005. We analyzed constitutions of the same subjects of each year tested. Results: In the second year of QSCC II assessment, 333 of the total 584 subjects were classed as the same constitutions as in their first test. The reproducibility was thus 56.88%. After the third year of QSCC II, 45 of a total 81 subjects were in the same constitutions. The reproducibility was thus 55.56%. Conclusions: We have found that the reproducibility of QSCC II is about 56%, so there is a severe limitation to diagnosis of constitution by QSCC II. Therefore, we must analyze constitutions through multiple objective methods.

Preparation of petroleum-based binder pitch for manufacturing thermally conductive carbon molded body and comparison with commercial coal-based binder pitch

조정훈,임지선,김민일,이영석,배병철 한국탄소학회 2020 Carbon Letters Vol.30 No.4

In the present study, carbon molded bodies were prepared by using graphite/coke fllers and petroleum-based binder pitch with various softening points, and the thermal properties of the prepared carbon molded bodies were investigated. The ratio of a binder afects the molded body preparation: no molded body was prepared at a low binder pitch content, and swelling occurred during the thermal treatment at a high binder pitch content. The binder pitch thermal treatment yield was the high�est at 41 wt% at the softening point of 150 °C and the lowest at 23 wt% at the softening point of 78 °C. A signifcant mass reduction was found in the range of 150 to 300 °C in the petroleum-based binder pitch, and in the range of 300 to 475 °C in the coal-based binder pitch. The molecular weight of the binder pitch was analyzed through the matrix-assisted laser desorption/ionization time-of-fight (MALDI-TOF) method. The molecular weight ratio within the interval showing the highest binder pitch molecular weight (178 to 712 m/z) was the highest at 66.4% in the coal-based binder pitch (softening point 115 °C) and the lowest at 46.0% in the petroleum-based binder pitch (softening point 116 °C). When the petroleum�based binder pitch was applied, as the softening point was increased, the voids decreased and thus the thermal conductivity increased. The highest thermal conductivity was 99.5 W/mK for the carbon molded bodies prepared using the coal-based binder pitch and 102.8 W/mK for those prepared by using the petroleum-based binder pitch. The results showed that the thermal properties were similar between the coal-based binder pitch (softening point 115 °C) and the petroleum-based binder pitch (softening point 150 °C).