고전압 초전도전력기기용 전류도입선 개발을 위한 기체질소의 뇌임펄스 절연파괴특성에 관한 연구

강형구 忠州大學校 2010 한국교통대학교 논문집 Vol.45 No.-

Generally, a high voltage superconducting apparatus should be designed considering the lightning impulse breakdown characteristics, which is more severe than the AC breakdown characteristics. In this study, the electrical breakdown characteristics with respect to the field utilization factor is investigated experimentally for the establishment of insulation design criteria of an GN2 insulated high voltage electric power apparatus. Experimental results with sphere-to-plane electrode systems show that the electrical breakdown characteristics under lightning impulse voltage is potentially affected by the field utilization factor, the size of electrodes, and the gap distance of the electrode systems. From these results, the electrical insulation design criteria to estimate the electrical breakdown voltage in GN2 with similar size electrodes could be established.

한국 전통기물을 이용한 Found Objects 개념의 가구디자인 제안

강형구,Kang, Hyung-Goo 한국가구학회 2005 한국가구학회지 Vol.16 No.2

There are several way to classify the furniture. The furniture can be classified into use, style, and function, but if the furniture is classified into the way of production, it can be the industrial furniture and the studio furniture. Especially, technology and function of the furniture are important elements in industrial furniture. However, it could be considered artists' character and concept as more important elements in the studio furniture. The studio furniture had come out one of the historical movement in American furniture field after the World War II. This case to apply found objects began to increase after the 1970s. Using objects In furniture design field had built up sprightly after end of 1950s. This expression could be the statement of new expression that essential properties of matter in objects is removed. I try to suggest original and interesting furniture design to apply found objects in this thesis. Especially, I use the Korean traditional objects for the furniture and try to make their essential function to be changed. Also, I focus on furniture design to have formative element in their shapes.

우리나라 아트퍼니처의 태동과 전개양상 분석

강형구 한국가구학회 2022 한국가구학회지 Vol.33 No.4

In the 21st century, as the boundaries between art and design became blurred and the boundaries between the fields of art were breaking down, the public's interest in art furniture increased and the perception of furniture changed. In Korea, the term art furniture began to be used in the 1990s, and from 2000 onwards, not only art furniture exhibitions but also related research and seminars were actively developed. However, most of the art furniture related papers have studied Western cases, and research on Korean art furniture has not been done until now. Of course, it was a short period of about 30 years, and the exhibition activities gradually increased in 2000. Researchers have also been conducting various studies related to art furniture. Through this study, the possibility of artistic expression of furniture was explored, and the values of the times and various forms of expression of art furniture were analyzed. However, a series of studies were all conducted through cases of overseas art furniture, which made me feel the need for research on Korean art furniture. Therefore, this study intends to analyze how the concept of art furniture that was formed a long time ago started in Korea, its causes, and to study how it has developed. The purpose of this study is to analyze the birth and development of art furniture in Korea, and through this, it is meaningful to organize the history of art furniture in Korea, and to use it as an opportunity to assess what is necessary for the development of art furniture in Korea in the future. .

상대론적 시공간의 합리적 재구성과 물리적 객관성 : 라이헨바흐의 경험주의 시공간 철학 연구

강형구 대동철학회 2022 大同哲學 Vol.101 No.-

Reichenbach’s major work in his philosophical analysis of relativity theory is his 1924 book Axiomatization of the theory of relativity. This book is a kind of ‘rational reconstruction’ of the relativistic space-time in the theory of relativity. Reichenbach tried to explicate the major philosophical problem of relativity theory by his rational reconstruction. The problem was the objectivity of space and time in general relativity. In chapter 2, I discuss the meaning of axioms, definitions and simplicity in Reichenbach’s constructive axiomatic system. In chapter 3, I describe Reichbach’s explication of the meaning of ‘coincidence’ and major contents of his constructive axiomatic system. I show that Reichenbach arrived to different conclusion on the objectivity of space-time compared to Einstein’s conclusion. In chapter 4, I discuss on several philosophers views who discussed on the significance of Reichenbach’s constructive axiomatization. Especially I argue that Thomas Ryckman’s negative judgement on Reichenbach’s axiomatization is from his misunderstanding on the axiomatization. Contrary to Ryckman’s opinion, Reichenbach divided light axioms and material axioms to avoid structural complexity of rigid rods and clocks. Furthermore, Reichenbach tried to show that topological axioms which use light signals still hold in general relativity in which material axioms and metrical axioms do not hold anymore. This means that objectivity of space and time still maintains in general relativity. Finally, I point out that philosophical disagreement between Reichenbach and Einstein continued to their debate on the empirical determinability of the physical geometry. 상대성 이론에 대한 라이헨바흐의 철학적 분석을 대표하는 저술은 그의 1924년 저 서 상대성 이론의 공리화이다. 이 책은 상대성 이론에서 제시된 시공간에 대한 일 종의 ‘합리적 재구성(rational reconstruction)’을 담고 있으며, 그는 이러한 재구 성을 통해 상대성 이론이 제시한 중요한 철학적 문제인 ‘시공간의 객관성’ 문제를 해 명하고자 했다. 우선 나는 논문 2장에서 라이헨바흐의 구성적 공리체계 속 공리와 정 의 및 단순성의 의미에 대해 논함으로써 이 체계가 갖는 ‘경험적 특성’을 밝힌다. 논문 3장에서 나는 ‘일치(coincidence)’에 대한 라이헨바흐의 해명 및 그가 구성적 공리체 계를 통해 재구성한 상대론적 시공간의 주요 내용을 기술한다. 이상의 논의를 통해 나는 라이헨바흐가 합리적 재구성을 통한 철학적 해명 과정에서 시공간의 물리적 객 관성에 관해 이론의 창시자였던 아인슈타인과는 다른 철학적 결론에 이르렀음을 보일 것이다. 논문 4장에서 나는 라이헨바흐의 구성적 공리화가 갖는 의의를 평가했던 주 요 철학적 논자들의 입장을 검토한다. 그중에서도 특히 나는 신칸트주의적 관점에서 라이헨바흐의 구성적 공리체계가 갖는 의의를 비판한 철학자 토머스 리크먼의 입장을 검토한 후, 이와 같은 리크먼의 부정적인 평가가 라이헨바흐의 구성적 공리체계에 대 한 일종의 오해에서 비롯되었음을 보인다. 리크먼의 주장과 달리 라이헨바흐는 강체 막대와 시계가 갖는 구조적 복잡성을 최소화하기 위해 빛 공리들과 물질 공리들을 분 리하였으며, 그는 물질 공리들과 계량적 공리들이 더 이상 적용되지 않는 일반 상대성 이론에 이르러서도 빛 신호로 구성된 위상적 공리들은 여전히 적용됨으로써 시공 간의 객관성이 유지됨을 보이고자 했다. 논문의 결론에서 나는 물리학자와 철학자의 이와 같은 의견 차이가 이후 물리적 기하학의 경험적 결정 가능성에 대한 아인슈타인 -라이헨바흐 논쟁으로 이어졌음을 지적하며 논의를 끝맺는다.

초등학교 건축물의 외관형태 유형에 관한 연구

강형구,이청웅 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2

이자율 복제를 통핚 주식 듀레이션 포트폴리오 젂략

강형구,남건우,핚민연 한국재무학회 2013 한국재무학회 학술대회 Vol.2013 No.11

본 연구는 주식을 이용하여 이자율을 복제하는 포트폴리오(„듀레이션‟ 포트폴리오)를 구성하여 이자율 위험을 헤지(Hedge)함과 동시에 초과 수익을 창출하는 트레이딩 젂략을 제시하였다. 듀레이션 포트폴리오에 대핚 연구 결과는 다음과 같다. 첫째, 듀레이션 포트폴리오의 수익률은 CD 와 비슷하게 변동하였다. 둘째, CD 금리가 10%와 20% 무비용 듀레이션 포트폴리오를 잘 설명하는 결과를 얻었다. 셋째, VAR 분석 결과, 1 주 젂의 듀레이션 포트폴리오의 수익률이 CD 금리와 음(-)의 유의핚 관계를 가지고 있는 것으로 나타났다. 본 연구의 시사점은 다음과 같다. 첫째, 본 연구는 주식 포트폴리오 매니저들이 운용 내규 및 제핚 내에서, 이자율 위험에 탄력적으로 대응핛 수 있는 방앆을 제공핚다. 둘째, 본 연구의 방법롞을 통해서 다른 여러 거시경제 요읶, 예를 들어 홖율, 원자재 지수를 반영핚 포트폴리오 젂략을 맊들어 낼 수 있다. 마지막으로 듀레이션 포트폴리오의 이자율에 대핚 예측력을 홗용하여 찿권 운용에 홗용핛 수 있다.

국내 전자상거래의 규제 및 글로벌 경쟁 이슈: 시장지배력, 데이터 주권, 아마존 효과를 중심으로

강형구,전성민 한국법경제학회 2018 법경제학연구 Vol.15 No.3

The domestic e-commerce market faces internal and external issues such as the concerns of regulators over dominant IT companies and the entry of large global companies such as Amazon. In order to address these market and non-market challenges, firms need integration strategy. One way of undertaking integration strategy is to provide stakeholders with solutions and solution stores. This facilitates stakeholder engagement, ecosystem flourishment and common value creation. We suggest domestic firms to design the landscape in which community stakeholders and global companies compete in the non-market area on behalf of domestic enterprises while domestic firms conduct full-scale attack toward global ones in market area. The current debate about online gol-mok-sang-gwon or backstreet commerce right can become a strategic resource form domestic firms, The notion is not just an oxymoron. Solution stores will become a killer application. To this end, it is necessary to distinguish between data-related ownerships and licenses rights. Firms should strategically encourage securing the right to use and protecting consumer data right This will make the life of incoming global tech giants hard. In addition, domestic firms should focus on acquiring and analyzing qualitative data and process data for which consumers do not have sovereignty and in which firms can find a source of sustainable competitive advantage. 국내 온라인 커머스 시장은 내부적으로는 시장지배력 및 데이터 주권과 같은 대형 IT 기업들에 관한 규제 감독 기관 등의 우려, 외부적으로는 아마존 등 거대 글로벌 기업의 진출과 같은 이슈에 직면해 있다. 본 연구에서는 비시장 영역과 시장 영역에서의 최근 전자상거래 이슈에 대해 통합전략 관점에서 경제학 및 제도적 분석을 통해 시사점을 도출하고자한다. 통합전략의 핵심은 이해관계자들에 대한 기술 및 솔루션 제공으로 생태계와 플랫폼에 참여하는 이해관계자들의 문제를 해결하고 공동가치를 창출해야 한다는 것이다. 이를바탕으로 국내 기업들은 이해관계자들과 글로벌 기업이 비시장 영역에서 경쟁하는 구도를 유도할 수 있다. 온라인 골목상권 논란을 형용모순(oxymoron)을 넘어서 핵심 역량이 되도록 승화시킬 수 있으며 킬러 앱은 솔루션 스토어가 될 가능성이 높다. 또한 솔루션 개발에 핵심적인 데이터 관련 소유권과 사용권을 구분하고 소비자의 데이터 주권을 과감히 인정하고 사용권을 확보하는 데 초점을 두어야 한다. IT 기업은 소비자 주권이 미치지 않는프로세스 정보와 비정형 질적 데이터 확보와 분석에 주력하여 지속 가능한 경쟁우위의 원천으로 삼아야 한다.

An Extension of the Five-factor Affine Term Structure Model: Predicting Future Bond Returns

강형구,장가영,이동준 한국증권학회 2021 Asia-Pacific Journal of Financial Studies Vol.50 No.6

We investigate time-varying risk premia in Korean government bonds using a five-factor affine model. The model generates nearly perfectly fitted yields and estimates the bonds’ expected returns with more precision than the four-factor model. We also find the statistically significant predictive power of the model for future bond returns using forward rates from cross-sectional and time-series regressions. The predictive power varies in time for bonds with different maturities and reverts to the mean values for short- and long-term bonds, while showing a sign of momentum for medium-term bonds. In out-of-sample exercises, the predictive power is even enhanced when volatility increases.

A Study on the Technique and Process of Bending Wood

강형구 한국가구학회 2010 한국가구학회지 Vol.21 No.6

Materials are such an important factor in designing furniture. Wood is the biggest part of furniture materials. While wood is soft, eco-friendly and natural material, it is variable because it is characterized by severe expansion and contraction. Thus, if the changeable characteristic of wood is not considered in furniture design, the good design of furniture cannot be produced. As one of the skills dealing with woods, bending is such a useful way for making various forms of furniture. While it has been used in furniture-making for a long time, wood processing techniques like steaming bending, bending with ammonia and high frequency bending has been advanced. As wood is a viscoelastic material and has some plasticity, beautiful curves can be created when force is applied. Therefore this paper studies the types of bending methods for furniture and each characteristic of them. Furthermore, this study classifies wood process according to suitability for mass production or small-scale production and researches the proper wood process by the forms and the way of furniture production. Also this study aims to help furniture designers and cabinet makers with wood bending.

Egg Production Rate of the Copepod Calanus sinicus off the Korean Coast of the Yellow Sea during Spring

강형구,이창래,최근형 한국해양과학기술원 2011 Ocean science journal Vol.46 No.3

The egg production rate (EPR) of Calanus sinicus was measured from March 2007 to April 2010 at three stations along the Korean coast of the Yellow Sea (in coastal waters off Saemangum, Yeongheungdo, and Asan Bay) to estimate in situ maximum egg production rate (MEPR) and to understand whether the females were limited in their growth or fecundity in the field. The mean EPR of C. sinicus at each sampling date ranged from 10.3-34.9 eggs female^(-1) d^(-1) (mean 23.4 eggs female^(-1) d^(-1)), and the EPR of individual copepods ranged from 0-81 eggs female^(-1) d^(-1). The mean EPR was positively correlated with the body weight of female copepods. The MEPR at each sampling date ranged from 40-81 eggs female^(-1) d^(-1) (mean 50.4eggs female^(-1) d^(-1)). Over 84% of eggs spawned hatched successfully. The weight-specific growth rate (WSGR) ranged from 0.038-0.111 d^(-1) (mean 0.082 d^(-1)), indicating that 3.8-11.1% of the carbon in an adult female was produced daily as female growth. The WSGR was negatively correlated with water temperature. The ratio of mean EPR to observed mean MEPR ranged from 20-70% (mean 46%), indicating that ~54% of a female’s growth might be limited in the field. We suggest that the ratio of observed EPR to mean MEPR of copepod can be applied to understand how the copepod responds to environmental changes, as well as EPR and hatching success.