자연 표현의 필법과 그 변화 연구 : 연구자의 작품을 중심으로

이지호 조선대학교 대학원 2010 국내박사

ABSTRACT A Study on the Stroke of the Brush for the Expression of Nature and Its Changes LEE JI HO Advisor: Prof. JO SONG-SIG, Ph. D. Department of the Fine Arts Graduate School of Chosun University Many painters who study modern Oriental painting pursue a gradual change on the basis of the principle of the old thing-oriented creation of new things (法古創新) or attach great importance to the new conceptual meaning by borrowing the technique of Western painting or the function of media. The former depends on models for its technique of the brush, thought and subject materials, whereas the latter expresses the situations of the times by breaking away the existing viewpoints of thinking or traditional conception. Since the expression of nature was named as painting in the Orient, the changing process of painting has developed gradually. Therefore, painting has been always linked to traditions and modified its characteristics gradually, thus interacting with contemporary situations and prospecting the future from there. However, the expressive technique of the Orient which has been in line with the concept of harmony theory experiences somewhat confusion due to its mix with the ontological thought in the Occident. In other words, it is the phenomenon occurred in the process when the modern situations of painting come to face with the inherent rules of the Orient and the Occident and then contradict or assimilate with them. Therefore, the tendency of Oriental painting is classified into: The one which comprises all the traditional and modern viewpoints and then attempts to maintain balance between them; and the other which emphasizes creativity not from the aspect of tradition but from the aspect of new conception. This phenomenon seems to be derived from the combination of expressive materials or views of thinking with a variety of environmental factors. With this fact, we must perceive the necessity of being on the alert for the stagnant of the Oriental painting in the past or its cling to the phenomena of the times. In this vein, the investigator took the former's view and focused on the creation of modernity on the basis of old things in this study. In other words, by examining the meaning of traditional techniques of the brush, the investigator tried to draw out the new conception of all ages and countries. In addition, by reconsidering traditional thoughts and views of thinking from the modern aspect, the investigator pursued the change of expressive formation. This was mainly due to the investigator's formative formation, learned on the basis of tradition so far. However, it was also due to the requirement of the times which trying to change the tradition. In this vein, the investigator examined the answer by means of the two expressive formations in ancient and modern ages in general and then looked into the use technique of brush, ink stick and color. In addition, in the course of study, the investigator reconsidered the traditional expressive technique of landscape, which had been carried out customarily, and then introduced righteousness (spirit), rules (the technique of the brush), things (materials) and time (the nature of the times) into the investigator's new abstract technique of expression. Therefore, the investigator carried out an experiment based on a consistent category, namely the expression of nature, and then demonstrated its results. In the concertizing process of it, the investigator searched the answer from the model of traditional expression of landscape and then drew out diverse aspects. And based on study findings, the investigator began to change expressions and established new formative formations, namely rice paddies that depending solely on rainfall for water (天水畓) and wave patterns (波象紋). By breaking away the formation of actual or practical landscape in the past, the investigator drew out the linear formations of nature and then intensified its abstract formations in order to examine the inherent meaning of nature intensively. In particular, through the dynamics and harmony of lines, the investigator drew out musical, poetic and time-oriented meanings of nature and then tried to project the pure life of human beings who ultimately getting along with nature. Therefore, by going forward one step more from the original bearing of pursuing the technique of the brush and the change of expression, the investigator could approach a little near to the inherent attributes of nature expression, namely human beings and nature and nature and environment. In conclusion, in this study, the investigator drew out the viewpoint of traditional technique of the brush, the viewpoint of subject materials, the viewpoint of thoughts and ways of thinking and the viewpoint of nature and human beings and then brought them into the viewpoint of the times. In particular, they included internal and external meanings and phenomena, such as melodies, rhythms and dynamics simultaneously.

유아 그림책에 나타난 인성교육 덕목 분석 : 인성교육진흥법을 중심으로

이지호 韓國外國語大學校 敎育大學院 2020 국내석사

The purpose of this study is to examine the distribution of the eight core virtues of character education and the sub-components of each virtue in picture books for young children. The specific research questions selected for this are as follows. Research problem 1. What is the distribution of the eight core virtues of character education in picture books for young children? Research problem 2. What is the distribution of sub-components of eight core virtues of character education in picture books for young children? The subjects of this study are the top 10 books of monthly bestsellers since January 2016 among the top three children's picture books of 4 to 7 years old in the top three online bookstores in Korea according to the sales ranking record during the period from January 2016 to August 2019. Among the collected books, 91 picture books were selected for the final analysis, excluding duplicate books and books that did not contain stories. In order to analyze the distribution of character education virtues in picture books for young children, the analysis standard table of Lee Eun-jeong (2016) study was used focusing on the eight core virtues of character education, which were suggested by the Character Education Promotion Act (2015). The analysis was conducted from September 2nd to October 26th, 2019, and frequency analysis was performed by calculating frequency and percentage. The results of this study are summarized as follows. First, as a result of analyzing the distribution of the eight core virtues of personality education in the best-selling picture books of young children, 277 virtues were analyzed in the picture books of 91 children, followed by communication, consideration, respect, cooperation, responsibility, manners, filial duty, and honesty. The eight core virtues of character education are all dealt with in picture books of young children, but virtues are somewhat biased. Second, as a result of analyzing the distribution of sub-components by eight core virtues of character education in children's best-selling picture books, consideration among virtues was dealt with in picture books relatively evenly, but each sub-component of other virtues was concentrated in picture books. In conclusion, this study suggests that the virtues of character education for young children should be distributed evenly in picture books for young children in the future, focusing on the eight core virtues of character education in the Personality Education Promotion Act for the practice of proper character education in early childhood. 본 연구는 유아 그림책에 나타난 인성교육 8대 핵심 덕목과 각 덕목 별 하위 구성 요소의 분포를 알아보는 데 목적이 있다. 이를 위해 선정한 구체적인 연구 문제는 다음과 같다. 연구문제1. 유아 그림책에 나타난 인성교육 8대 핵심가치․덕목의 분포는 어떠한가? 연구문제2. 유아 그림책에 나타난 인성교육 8대 핵심가치․덕목별 하위구성요소의 분포는 어떠한가? 본 연구의 대상은 2016년 1월부터 2019년 8월까지의 기간 동안 매출 순위기록에 따른 국내 온라인 서점 상위 3곳의 4세~7세 유아 그림책 중 2016년 1월 이후 월간 베스트셀러 상위 10위 도서이다. 취합된 도서 중 중복된 도서, 이야기가 담기지 않은 도서 등을 제외하여 최종 분석 대상 그림책을 91권으로 선정하였다. 유아 그림책에 나타난 인성교육 덕목의 분포를 분석하기 위하여 인성교육진흥법(2015)에서 제시한 인성교육 8대 핵심가치․덕목인 예, 효, 정직, 책임, 배려, 소통 협력, 존중을 중심으로 이은정(2016) 연구의 분석 기준표를 사용하였다. 분석은 2019년 9월 2일부터 10월 26일까지 이루어졌으며 빈도와 백분율을 산출하여 빈도분석을 실행하였다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, 유아 베스트셀러 그림책에 나타난 인성교육 8대 핵심 덕목의 분포를 분석한 결과 91권의 분석대상 유아 그림책에서는 총 277개의 덕목이 분석되었고 소통, 배려, 존중, 협동, 책임, 예, 효, 정직 순으로 덕목이 나타났다. 인성교육 8대 핵심 덕목이 유아 그림책에서 모두 다뤄지고 있으나 덕목들이 다소 편중되어 나타나고 있었다. 둘째, 유아 베스트셀러 그림책에 나타난 인성교육 8대 핵심 덕목별 하위구성요소의 분포를 분석한 결과 덕목 중 배려는 하위구성요소의 분포가 비교적 고르게 그림책에서 다루어지고 있었으나 그 외 덕목들의 각 하위구성요소는 그림책에서 편중되어 나타나고 있었다. 이러한 결과를 종합하여 본 연구는 유아기 올바른 인성교육의 실천을 위해 인성교육진흥법의 인성교육 8대 핵심 덕목을 중심으로 향후 유아인성교육의 덕목이 유아 그림책에 고르게 분포되어야 할 필요성이 있음을 시사한다.

진주광택안료 배합 아이섀도에서의 펄감 및 성형안정성 개선

이지호 충북대학교 2020 국내석사

Recently, there is an increasing demand for consumers who want to express the splendid, brilliant and sparkling pearl effect in makeup products. In order to meet these consumer demands, pearlescent pigments with various and large particle sizes should be used. However, the equipment generally used to produce the pressed type eyeshadow reduces the pearl effect, as a result of grinding the pearl pigment by high speed shearing. To improve this problem, the content of pearlescent pigments should be increased. However, it causes difficulty to maintain the molding stability. In the study, three types of eyeshadow formulations without grinding process were developed based on three different types of binder bases. The pearl effect of three types of formulations was improved by the new method of eyeshadow manufacturing process without the grinding process of pearlescent pigments. Also improvement of molding stability of the 3 types eyeshadow was observed.

학령전기 보행장애의 원인 중 양성 급성 소아기 근염의 의미

이지호 충북대학교 2015 국내석사

Background : There are some children have sudden-onset gait disturbances of unclear causes. In such cases, most of clinicians pretend to perform series of diagnostic investigations including invasive procedures to rule out serious but rare diseases. But from our experiences, there are very mild diseases that can cause transient gait disturbances and no need of invasive diagnostic investigations, such as the benign acute childhood myositis(BACM). Purpose : With a clinical rarity of disease, we want to make a concern of BACM rather than a more serious, but rare diseases like Guillain-Barré syndrome. Through comparisons of clinical mani- festations and laboratory findings among another causes of gait disturbances, we tried to make a method that can differentiate BACM from other diseases to avoid unnecessary invasive procedures. Methods : From Jan 1, 2009 to Dec 31, 2013, there were 68 patients with sudden-onset gait disturbance visited emergency department of Chungbuk National University Hospital. All of patients were admitted, and diagnosed as BACM, Guillain-Barré syndrome, transient syno- vitis, and septic arthritis. We compared clinical manifestations and laboratory findings among disease groups. Results : There were one clinical symptom and one laboratory finding that can differentiate BACM group from other disease groups with enough statistical significance. They were upper respiratory symptoms within recent 4 weeks and aspartate aminotransferase(AST). With a cut-off value of AST 45 IU/L, the diagnostic sensitivity of BACM was 94.4%, specificity 89.6%, positive predictive value 77.3%, negative predictive value 97.7%, and accuracy 90.9%. Conclusion : BACM is a transient phase that can cause a sudden-onset nontraumatic gait disturbance in preschool-aged children. Especially BACM is noted mainly in boys, from late winter to spring, with upper respiratory symptoms, and with fever. AST can help to make a decision to undergo some invasive procedures to rule out other causes of gait disturbance, with a cut-off value of 45 IU/L. 배경 : 특별한 이유 없이 갑자기 발생한 보행장애를 겪는 아이들이 간혹 있다. 이 경우, 대부분의 임상의들은 빈도는 드물지만 중증도가 높은 원인질환을 먼저 감별하기 위해 침습적인 검사를 포함한 일련의 진단적 검사들을 시행하려는 경향이 있다. 그러나, 보행장애를 일으키는 원인 중에는 양성 급성 소아기 근염이라는 침습적인 검사를 필요로 하지 않는 매우 양호한 경과를 보이는 질병도 있다. 목적 : 길랑-바레 증후군과 같은 드물지만 심각한 질병에 대한 관심과 마찬가지로, 양성이지만 빈도가 높은 양성 급성 소아기 근염에 대해서도 관심을 가질 필요가 있다고 생각하였다. 이에, 양성 급성 소아기 근염 환아들의 임상 양상과 검사 소견을 보행장애를 일으키는 다른 원인질환과 비교하여, 침습적 검사 없이 이를 다른 질병군과 감별할 수 있는 방법을 찾아보고자 하였다. 방법 : 2009년 1월 1일부터 2013년 12월 31일까지 보행장애를 주소로 충북대학교병원 응급실을 방문한 환아는 총 68명이었고, 모두 입원하여 치료받았으며, 진단된 원인 질환은 양성 급성 소아기 근염, 길랑-바레 증후군, 일과성 활액막염, 그리고 화농성 관절염이었다. 양성 급성 소아기 근염군과 다른 세 질병군 사이의 임상 양상과 검사 소견을 비교하였다. 결과 : 통계적으로 유의하게 양성 급성 소아기 근염군을 다른 질병군과 구별할 수 있는 한 가지의 증상과 한 가지의 검사 소견이 있었다. 내원 4주 이내의 상기도 감염 여부와 아스파르트산 아미노기전이효소 (AST) 가 그것이다. AST가 45 IU/L 이상일 때를 양성 급성 소아기 근염 진단의 감별점으로 하였을 경우, 진단적 민감도는 94.4%, 특이도는 89.6%, 양성 예측도는 77.3%, 음성 예측도는 97.7%, 그리고 정확도는 90.9% 이었다. 결론 : 양성 급성 소아기 근염은 학령전기 아동에게서 갑작스런 비외상성 보행장애를 일으킬 수 있는 양성 일과성 병태로, 특히 남아이면서, 늦은 겨울부터 봄 사이에, 상기도 감염 증상과 발열이 동반된 경우에 양성 급성 소아기 근염일 가능성이 높다. 또한, AST를 측정하여 45 IU/L 이상일 경우, 보행장애의 다른 원인을 확인하기 위한 추가적인 침습적 검사를 시행할 필요성이 비교적 낮다고 할 수 있다.

트랜스미디어 스토리텔링에 기반한 아이돌 콘텐츠 서사 분석 : 엔하이픈과 앤팀의 “다크 문” 세계관을 중심으로

이지호 중앙대학교 첨단영상대학원 2024 국내석사

The domestic idol industry appeals to idols with diverse concepts and worldviews and is achieving transnational results. Leading the way, BTS developed their worldview “BU” through transmedia storytelling using albums, videos, novels, and webtoons. Based on the transmedia storytelling theory established by Henry Jenkins, this study examined the convergence implications of idol content's strategy of leading user participation in multimedia with an integrated world view. And in order to understand whether HYBE is developing and supplementing transmedia storytelling for idols after BTS, focused on “DARK MOON” the original story of ENHYPEN, &TEAM among HYBE’s idol groups. The characteristic of ENHYPEN and &TEAM transmedia storytelling is that the original story, which is the world view, crosses the two groups. These stories unfold non-sequentially within one “DARK MOON” worldview and are adapted, extended, and expanded. Additionally, by setting the two groups as antagonists, the fact that the characters may look different depending on the order in which the user traverses them also arouses users' curiosity. In addition, the appearance and personality of real people and characters in the original work were partially consistent, breaking boundaries and allowing users to enjoy the ‘DARK MOON Game’ so that they could actively immerse themselves in it. Nevertheless, it is difficult to find many examples yet because it is a strategy that involves a lot of human and material resources. Users also suggested the need for ways to break down the barriers to entry into multi-media content and the need for diversity in the uniform worldview of idols. The purpose of this thesis is to emphasize that transmedia storytelling is effective branding in the current era. It is hoped that this will help structure the idol industry, which is seeking to transition to various media, and establish marketability in the long term. 국내 아이돌 산업은 다양한 콘셉트와 세계관으로 아이돌을 소구하고 초 국적 성과를 이루고 있다. 이를 선도하는 방탄소년단은 음반, 영상, 소설, 웹툰 등을 활용하여 그들의 세계관 “BU”를 트랜스미디어 스토리텔링으로 전개하였다. 본 연구는 헨리 젠킨스가 정립한 트랜스미디어 스토리텔링 이 론을 바탕으로 통합된 세계관을 가지고 아이돌 콘텐츠가 다매체에서 사용 자 참여를 이끄는 전략에 대한 컨버전스 함의를 살펴보았다. 그리고 하이브 가 방탄소년단 이후 아이돌에게 발전되고 보완된 트랜스미디어 스토리텔링 을 펼치고 있는지 파악하기 위하여 하이브의 아이돌 그룹 중 엔하이픈과 앤팀의 오리지널 스토리인 “다크 문”을 중점적으로 들여다보았다. 엔하이픈과 앤팀의 트랜스미디어 스토리텔링이 특징은 세계관인 오리지널 스토리가 두 그룹을 가로지른다는 것이다. 이들은 하나의 “다크 문”세계 관 안에서 비순차적으로 이야기를 전개하며 각색, 연장, 확장된다. 또한 두 그룹을 대립 인물 관계로 설정하여 사용자가 횡단하는 순서에 따라 캐릭터 들이 다르게 비추어 질 수도 있다는 점도 사용자에게 호기심을 불러일으킨 다. 또한 실제 인물과 오리지널 스토리 속 캐릭터의 외형고 성격을 일부 일 치시켜 경계를 흐리며 사용자들의 몰입을 적극 이끌어 ‘다크 문 놀이’를 즐 길 수 있도록 하였다. 그럼에도 많은 인적, 물적 자원을 수반하는 전략이라 많은 사례를 찾기 어렵다. 사용자 또한 다매체로 분화되는 콘텐츠들의 진입장벽을 허물기 위 한 방안과 천편일률적인 아이돌 세계관의 다양성이 필요함을 제안하였다. 본고는 트랜스미디어 스토리텔링이 현 시대에 유효한 브랜딩임을 역설하 는 데에 목적을 둔다. 다양한 매체 전환을 꾀하는 아이돌 산업을 짜임새있 게 하고 장기적으로 시장성을 갖추는 것에 도움이 되기를 희망한다.

小鹿島 한센病 患者의 居住環境에 관한 硏究

이지호 朝鮮大學校 産業大學院 2004 국내석사

In 1916, the Jahye hospital for Hansen's diseased patients opened on Sorok Island so that the patients could settle for their treatment. The name was changed several times and since 1982, it has been called the National Sorokdo hospital. As the Joseon Chongdokbu enacted and announced the Joseon Hansen Disease Prevention Program on April 20, 1935, legal management of Hansen's patients started. The government amended and announced the regulation about the prevention of infectious diseases on February 9, 1963. The regulation was adjusted to actual conditions as the village construction movement was developed, which made it possible to cure the patients at home. According to the amendment of this regulation, the patients who were forced to be isolated from their families or society in Sorok Island or an asylum for Hansen's patients, was freed from forced isolation. Compared with the Japanese government's abolishing regulations for forceful isolation in 1996, our amendment was very exceptional. However, it is thought that our prejudice and misunderstanding against the disease was not very different from those of the Japanese. Social interest to care for the patients is still continuing, but elimination of the prejudice is still an important consideration. If Hansen's disease is found in the beginning and treated, it can be cured with germs negative without additional disorder. If not, it may cause serous disorder and inconvenience in walking, self-sufficiency, and shrinkage of social activities. The past management of Hansen's disease focused on microbiological treatment and prevention, but in these days, recovery to society is just as important. For the recovery to society of the patients, their physical and social rehabilitation is required. Despite of the effort of the recovery to society, the prejudice against the disease of people and medical personnel causes much difficulty. This study examined how the patients has lived under what system and environment through historical illumination and aimed at presenting future direction for improvement of their quality of living. The number of the patients in hospital in 1947 was 6524; which gradually decreased as patients were discharged for rehabilitation and natural death. As of the late June in 2003, the number is 748 and among them, 130 are seriously diseased. Although the number of the patients decreased, the demand for better welfare and medical service has increased. To satisfy the demand, medical personnel must be expanded md enough facilities for the patients in hospital and future patients should be secured to protect and cure. Moreover, to improve their quality of living, long-term and short-term plans about multi-dimensional social welfare service programs should be developed. Improvement is also required as follows: living environment of the patients, improvement of human rights through enactment of hospital management rules, promotion of welfare through better dining management considering more nutrition and taste of the patients, distribution of welfare allowances, and stable guaranty of volunteers.

협력적 서브 가속기 쌍 기반의 트랜스포머 가속을 위한 스케일 아웃 시스톨릭 어레이

이지호 이화여자대학교 대학원 2024 국내석사

Transformers have become a pivotal computational block in modern deep learning models, with their usage and model sizes witnessing rapid growth. Consequently, developing dedicated accelerators that can efficiently compute transformer models while considering hardware overheads has become a significant challenge in the advancement of deep learning. However, current transformer accelerators are primarily limited to single or a few systolic array structures, failing to fully exploit the inherent parallelism in these workloads. This work proposes a novel scale-out accelerator architecture that supports matrix-level parallel processing in multi-head attention. We propose a collaborative workflow for pairs of systolic sub-accelerators, enabling input operand reuse and parallel computation of independent layers in an attention head. Our static scheduler efficiently allocates layer operations to sub-accelerators, finding the most efficient way to scale computations across multiple pod pairs. The adoption of two-level on chip buffer and interconnections between pods in our microarchitecture design helps reduce costly memory accesses. In our evaluation, the proposed method achieves 1.46×-1.6× speedup and saves 9.8-14.6% in energy consumption compared to the state-of-the-art transformer accelerator. 현대 딥러닝 모델에서 트랜스포머(Transformer)는 핵심 연산 블록으로 자리잡고 있으며, 이의 사용과 모델 크기가 급속히 증가하고 있다. 이러한 상황에서 트랜스포머 모델을 효율적으로 계산할 수 있는 전용 가속기(Accelerator) 개발은 딥러닝 분야에서 중요한 도전과제로 부상하고 있다. 그러나 현재까지의 트랜스포머 가속기들은 대부분 단일 혹은 소수의 시스톨릭 어레이(Systolic Array) 구조에 국한되어 있어, 이러한 워크로드의 병렬 처리 가능성을 충분히 활용하지 못하고 있다. 본 연구에서는 트랜스포머의 멀티헤드 어텐션(Multi-Head Attention)을 지원하는 새로운 스케일 아웃(Scale-Out) 구조의 가속기를 제안한다. 이 가속기는 두 개의 시스톨릭 어레이 서브 가속기를 협력적으로 사용하여 입력 재사용 및 독립적인 레이어의 병렬 연산을 가능하게 하고, 사전 타일 스케줄링을 통해 멀티헤드 어텐션 연산을 여러 서브 가속기(Sub-Accelerator)에 효율적으로 할당한다. 아키텍처 측면에서는 2단계 온 칩 버퍼와 포드 간 인터커넥션을 도입하여 데이터 접근성을 향상시키고 컴퓨팅 어레이의 사용률을 높였다. 실험 결과, 제안된 방법은 기존 베이스라인 스케일 아웃 시스톨릭 어레이 대비 1.46x-1.6x 배의 속도 향상을 달성하고, 메인 메모리 접근 감소를 통해 에너지 소비를 기존보다 9.8-14.6% 절약했다.

수직-수평 푸로푸란 리그난의 효율적인 비대칭합성에 관한 연구

이지호 충북대학교 대학원 2006 국내석사

블록체인과의 연동을 통한 안전한 사물인터넷 서비스 설계 및 구현

이지호 세종대학교 대학원 2024 국내석사

사물인터넷 (IoT) 기술의 발전은 우리 삶에 편의를 제공하는 동시에 보안 위협도 함께 증가시키고 있다. 많은 IoT 기기들은 충분한 보안 메커니즘을 갖추지 못해 데이터 유출이나 서비스 거부 (Denial-of-Service, DoS) 공격에 쉽게 노출되는 실정이다. 이를 해결하기 위한 방안으로 블록체인 기술의 적용이 주목받고 있다. 블록체인은 합의 알고리즘을 바탕으로 데이터 변경을 어렵게 만들어, 무결성과 비가역성을 보장하는 특성을 지닌다. 이는 데이터 신뢰성을 높여 보안성 강화에 기여할 수 있다. 다만 블록체인을 활용하는 과정에서 요구되는 높은 연산 처리 능력은 리소스의 제약이 있는 IoT 기기에 직접 적용하기 어려운 문제를 야기한다. 따라서 본 논문에서는 IoT 기기가 블록체인 네트워크에 참여하지 않는 환경에서도 블록체인을 활용할 수 있는 방법을 제안한다. 이를 위해 본 연구는 oneM2M과 PDL 두 표준 간 상호 연동을 통한 안전한 IoT 서비스를 구현하였다. IPE 역할을 하는 "one-PIecE"를 설계하여, IoT 플랫폼의 API 요청을 블록체인 스마트 컨트랙트 호출용 JSON-RPC 요청으로 변환하고, 이를 통해 블록체인 상에 데이터가 기록되도록 하였다. 구현된 시스템은 표준 요구사항을 충족시켜 IoT 플랫폼과 블록체인 간 상호 운용성을 확보하였으며, 저사양 IoT 환경에서도 신뢰성 있는 서비스를 제공한다. 성능 평가 결과, 제안한 서비스는 기존 IoT 서비스 대비 과도한 지연 없이 응답 성능을 유지하면서 데이터 무결성과 신뢰성을 향상시켰음을 확인하였다. 또한 접근 제어 기능 검증을 통해 보안성 강화 효과도 입증하였다. 다만 PDL의 자체 블록체인 네트워크 미비로 인해 완전한 표준 연동에 제약이 있다. 향후 PDL 블록체인 네트워크 구축 시 이를 연동하고 표준화된 라이브러리를 도입하여 완전한 상호 운용성을 달성할 계획이다. 이를 통해 oneM2M의 기능을 스마트 컨트랙트로 구현하여 더욱 안전하고 신뢰성 높은 표준 기반 IoT 서비스를 제공할 수 있을 것으로 기대한다. The advancement of Internet of Things (IoT) technology has broug-ht convenience to our daily lives while simultaneously increasing security threats. Many IoT devices lack sufficient security mechanisms, making them vulnerable to data leakage or Denial-of-Service (DoS) attacks. As a solution, the application of blockchain technology has garnered attention. Blockchain, based on consensus algorithms, ensures data integrity and irreversibility by making data modifications difficult. This enhances data reliability and ultimately contributes to strengthened security. However, the high computational power required for blockchain operations poses challenges in directly applying it to IoT devices with limited resources. Therefore, this paper proposes a method to leverage such reliability and stability of blockchain networks even in environments where low-spec IoT devices do not participate directly in the blockchain network. To achieve this, we implemented a secure IoT service by interworking the oneM2M platform, a standard IoT platform, and the PDL platform, a permissioned blockchain standard. We designed “one-PIecE,” which acts as an Interworking Proxy. It converts API requests used in the IoT platform into JSON-RPC requests for calling blockchain smart contracts, ensuring that data is securely recorded on the blockchain. The implemented system meets standard requirements, thereby ach-ieving interoperability between the IoT platform and the blockchain, and provides reliable services even in low-spec IoT environments. Performance evaluations confirmed that the proposed service enhances data integrity and reliability without incurring excessive delays compared to existing IoT services. We also verified the effectiveness of access control features, demonstrating enhanced security. However, due to the absence of a dedicated blockchain network for PDL, there are limitations in achieving complete standardized interworking. In the future, we plan to integrate a PDL blockchain network and introduce standardized libraries to achieve full interoperability. Furthermore, by restructuring the oneM2M platform’s database using blockchain, all data can be retrieved and utilized through the blockchain. This will allow the functionalities of oneM2M to be implemented as smart contracts, thereby providing safer and more reliable standard-based IoT services.

원터치 철근 커플러의 경량화 설계 및 공정 개발

이지호 경상국립대학교 대학원 2025 국내박사

Rebar splicing is essential in construction sites. Traditional methods, such as lap splicing and welded splicing, have the disadvantages of being complicated to construct, taking up a lot of space, and difficult to maintain high quality. To overcome these limitations, one-touch rebar couplers have been developed and are receiving attention, but the current products are heavy and expensive, and there is room for improvement in terms of structure and process. This study aims to improve both economic efficiency and constructability by reducing the weight of one-touch rebar couplers and improving the manufacturing process. We analyzed the inefficiencies in the design and manufacturing processes of existing couplers using D25 rebars, which are widely used in the domestic construction market, and introduced various design techniques and processing methods to improve them. We applied the heat treatment process of SCM440 steel to enhance the mechanical properties of the coupler, and applied trapezoidal screws instead of existing triangular screws to improve the joining strength. In addition, we developed a new press processing method to design the housing to reduce its weight while maintaining structural stability. In addition, this study systematically evaluated the main variables of the coupler housing using the Design of Experiments (DOE) method and derived the optimal housing shape through the Response Surface Methodology (RSM). Through this, the shape and thickness of the housing were optimized to achieve weight reduction and the economic feasibility of the coupler was significantly improved. In addition, the manufacturing process of the housing and collet was simplified to increase production efficiency, and the overall manufacturing cost and time were reduced through design improvements. The coupler developed through this study has a lightweight design and high joining strength compared to existing products, enabling more efficient rebar connection work at construction sites. The results of the study provide important guidelines for the design and manufacturing of one-touch rebar couplers and suggest the possibility of expansion that can be applied to rebars of various diameters and special earthquake-resistant rebars in the future.