詩ㆍ文에 나타난 李萬敷의 歷史認識

이정규(Jeong-kyu Lee) 어문연구학회 2007 어문연구 Vol.54 No.-

  This thesis is aimed at examining the ancient history of our country, which Siksan Man-boo Lee had cognizance of. Prior to examining Siksan"s recognition of history, the researcher first paid attention to the consciousness of "making things valuable" which is thought to have affected the foundation for recognition of history. On the assumption that the real meaning of "making things valuable" may differ case by case, the researcher tried to make it clear that, overriding the assertion that Chosen succeeded China, Siksan"s consciousness of "making things valuable" expressed the culture of Chosen"s superiority, rather than none inferiority, to that of China. And, the researcher clarified that this point laid the foundation for Siksan"s having recognition of independent history. The peculiarity of the culture of home country is emphasized and the superiority of our culture is asserted everywhere in the writings scattered in a collection of Siksan"s works, And this confirmed that Chinese ethnic group and barbarians of the circumference are not distinguished by the race or location of a country, but by the culture of a country.<BR>  Subsequently, the researcher examined the recognition of history of our country in ancient times descending from Tangun time, by noting Siksan"s independent national consciousness that Chosen is an independent country as he deviates from the traditional viewpoint of Chinese ethnic group and barbarians of the circumference. He emphasized the existence of Tangun Chosen, extended the upper limit of our history by valuing highly the fact that Chosen was enlightened by Gija"s moving east, and noticed that thereby the pride of national culture was distinguished. But, he removed Wiman Chosen from our history, and did not considered our history discontinued by the outside power by determining the location of Hansagun to be above the Han River. Moreover, he showed dual recognition of history by establishing both the historical current of Tangun-Buyeo-Kokuryeo-Baekje and the other historical current of Tangun-Kija-Mahan.<BR>  Siksan attempted historical investigation of geography several times based upon what he saw and heard from his own travels, and went on to form his own historical viewpoint based upon the knowledge of ancient history he acquired from a variety of history books.

평가의 시간 순서를 고려한 강화 학습 기반 협력적 여과

이정규,오병화,양지훈,Lee, Jung-Kyu,Oh, Byong-Hwa,Yang, Ji-Hoon 한국정보처리학회 2012 정보처리학회논문지B Vol.19 No.1

최근 사용자의 흥미에 맞는 아이템이나 서비스를 추천해 주는 추천 시스템에 대한 관심이 높아지고 있다. 최근 종료된 Netflix 경연대회(Netflix Prize)가 이 분야에 대한 연구자들의 연구 의욕을 고취시켰고, 특히 협력적 여과(Collaborative Filtering) 방법은 아이템의 종류에 상관없이 적용 가능한 범용성 때문에 활발히 연구되고 있다. 본 논문은 강화 학습을 이용해서 추천 시스템의 협력적 여과 문제를 푸는 방법을 제안한다. 강화 학습을 통해, 영화 평점 데이터에서 각 사용자가 평점을 매긴 순서에 따른 평점 간의 연관 관계를 학습하고자 하였다. 이를 위해 협력적 여과문제를 마르코프 결정 과정(Markov Decision Process)로 수학적으로 모델링하였고, 강화 학습의 가장 대표적인 알고리즘인 Q-learning을 사용해서 평가의 순서의 연관 관계를 학습하였다. 그리고 실제로 평가의 순서가 평가에 미치는 영향이 있음을 실험을 통해서 검증하였다. In recent years, there has been increasing interest in recommender systems which provide users with personalized suggestions for products or services. In particular, researches of collaborative filtering analyzing relations between users and items has become more active because of the Netflix Prize competition. This paper presents the reinforcement learning approach for collaborative filtering. By applying reinforcement learning techniques to the movie rating, we discovered the connection between a time sequence of past ratings and current ratings. For this, we first formulated the collaborative filtering problem as a Markov Decision Process. And then we trained the learning model which reflects the connection between the time sequence of past ratings and current ratings using Q-learning. The experimental results indicate that there is a significant effect on current ratings by the time sequence of past ratings.

인터넷코너-"인터넷에서 퍼왔습니다"

이정규,Lee, Jeong-Gyu 대한양돈협회 1999 養豚 Vol.21 No.3

인터넷코너-"인터넷에서 퍼왔습니다"

이정규,Lee, Jeong-Gyu 대한양돈협회 1998 養豚 Vol.20 No.11

Barcelona Pavilion의 건축 분석

이정규,Lee, Jeong-Kyu 배재대학교 공학연구소 1997 공학논문집 Vol.2 No.1

이 논문에서 미스 반 데 로에의 바르셀로나 파빌리온의 건축적 특성을 분석하였다. 건축이 설계된 배경과 배치, 공간, 형태, 구조와 미학적 요소를 분석하였고, 같은 시기의 두 작품과 비교하였으며, 기존의 평가와 해석을 연구하였다. 그 결과 바르셀로나 파빌리온은 모든 근대건축 요소들이, 창작을 피워내는 상상력의 도가니 속에 함께 녹아들어 있음을 알게되었다. The pupose of thesis is to analyze the architectural characteristics of Mies's Barcelona Pavilion. I analyzed the site, space, form, structure, aesthetic elements, compared it with two other buildings by him, and studied the evaluation and interpretation about the building. I cocluded that all of the modern architectural elements were fused in the crucible of Mies's imagination to produce an original work of art.

세계화와 고등교육의 아시아적 가치

이정규,Lee, Jeong-Gyu 한국대학교육협의회 2003 大學敎育 Vol.122 No.-

2000년(Y2K)컴퓨터 연도인식 문제와 농업

이정규,Lee, Jeong-Gyu 대한양돈협회 1999 養豚 Vol.21 No.4

책이있는 에세이

이정규,Lee, Jeong-Gyu 대한출판문화협회 2000 출판저널 Vol.291 No.-

한우에 있어 6개월령 및 12개월령 체척측정치의 유전력과 유전상관

이정규,박영일,신언익 ( J . G . Lee,Y . I . Park,O . I . Shin ) 한국축산학회 1984 한국축산학회지 Vol.26 No.5

The object of this study was to estimate the heritabilities, phenotypic and genetic correlations among certain body measurements in Korean Native Cattle. The experimental animals for this study were 248 heads of Korean Native Cattle from 49 sires born from 1971 to 1982 at the Alpine Experiment Station in Pyung-Chang, Korea. The traits included in this study were withers height, chest width, chest girth, body length and thud width at 6 month and 12 month of age, The results obtained are summarized as follows; 1. The heritability estimates obtained in this study were 0.19 and 0.21 for withers height at 6 and 12 month, 0.15 and 0.45 for chest width at 6 and 12 month, 0.27 and 0.61 for chest girth at 6 and 12 month, 0.14 and 0.50 for body length at 6 and 12 month, 0.27 and 0.67 for thud width at 6 and 12 month. 2. The ranges of genetic, environmental and phenotypic correlations among body measurements at 6 month of age were 0.31-0.98, 0.33-0.65 and 0.39-0.64, respectively. The ranges of correlations among body measurements at 12 month of age were 0.62-1.09, 0.52-0.45 and 0.32-0.54, respectively. 3. The heritability estimates for 6-month body measurements were lower than for 12-month body measurements. The genetic correlations among body measurements at 6 or 12 month of age were high and positive, while the genetic correlations between body measurements at 6 and 12 month of age have shown much variation depending on the combinations of the traits.

The Effect of Surface Defects on the Cyclic Fatigue Fracture of HEROShaper Ni-Ti rotary files in a Dynamic Model: A Fractographic Analysis

이정규,김의성,강명희,금기연,Lee, Jung-Kyu,Kim, Eui-Sung,Kang, Myoung-Whai,Kum, Kee-Yeon The Korean Academy of Conservative Dentistry 2007 Restorative Dentistry & Endodontics Vol.32 No.2

본 연구의 목적은 니켈티타늄 전동파일의 피로파절에 있어서 표면 결함의 역할을 규명하고자 fatigue tester에서 반복적 인 fatigue force를 부여한 후 파절된 단면을 주사전자현미 경으로 관찰하여 파절 역학을 규명하는 것이다. 총 45개의 #30/.04 taper와 21 mm의 HEROShaper 니켈-티타늄 전동파일을 15개씩 3개의 군으로 분류하였다. 제 1군은 결함이 없는 새 HEROShaper파일, 제 2군은 제조과정에서 metal rollover나 machining marks와 같은 표면결함을 갖는 HEROShaper파일, 제 3군은 임상에서 4- 6개의 구치부 근관의 확대에 사용한 HEROShaper 파일을 사용하였다. 모든 파일들은 회전속도(300 rpm)와 pecking distance (3 mm)가 일정하게 맞춘 fatigue tester에서 파절될 때까지 시간을 측정한 후 통계분석을 통해 각 군간의 유의성을 분석하였고, 파절 단면의 farctographic analysis를 통해 파절역학을 규명하고자 하였다 실험결과 평균 파절시간에 있어서 group 1과 2, group 1과 3사이에는 통계학적으로 유의할 만한 차이가 있었으나 (p<0.05), group 2와 3사이에는 통계학적인 차이가 없었다. Fractographic analysis 결과 대부분의 파절면에서 microvoid와 dimple 소견을 갖는 ductile fracture양상이 관찰되었다. 또한 brittle fracture가 일어난 파절면에서는 파절선 전방에 수 많은 striation들이 관찰되었고 transgranular 및 intergranular cleavage 소견도 보였다. 표면결함이 있는 제 2, 3 군의 파절단면에서는 모든 시편에서 표면결함이 관찰되었다. 이와 같은 결과로 미루어 보아 표면결함이 반복 피로파절에서 미세균열의 기시점으로 중요한 역할을 하며 fractography분석법은 Ni-Ti 파일의 파절역학을 규명하는데 유용함을 알 수 있었다. This in vitro study examined the effect of surface defects on cutting blades on the extent of the cyclic fatigue fracture of HEROShaper Ni-Ti rotary files using fractographic analysis of the fractured surfaces. A total of 45 HEROShaper (MicroMega) Ni-Ti rotary flies with a #30/.04 taper were divided into three groups of 15 each. Group 1 contained new HEROShapers without any surface defects. Group 2 contained HEROShapers with manufacturing defects such as metal rollover and machining marks. Croup 3 contained HEROShapers that had been clinically used for the canal preparation of 4-6 molars A fatigue-testing device was designed to allow cyclic tension and compressive stress on the tip of the instrument whilst maintaining similar conditions to those experienced in a clinic. The level of fatigue fracture time was measured using a computer connected the system. Statistical analysis was performed using a Tukey's test. Scanning electron microscopy (SEM) was used for fractographic analysis of the fractured surfaces. The fatigue fracture time between groups 1 and 2, and between groups 1 and 3 was significantly different (p<0.05) but there was no significant difference between groups 2 and 3 (p>0.05). A low magnification SEM views show brittle fracture as the main initial failure mode At higher magnification, the brittle fracture region showed clusters of fatigue striations and a large number of secondary cracks. These fractures typically led to a central region of catastrophic ductile failure. Qualitatively, the ductile fracture region was characterized by the formation of microvoids and dimpling. The fractured surfaces of the HEROShapers in groups 2 and 3 were always associated with pre-existing surface defects. Typically, the fractured surface in the brittle fracture region showed evidence of cleavage (transgranular) facets across the grains, as well as intergranular facets along the grain boundaries. These results show that surface defects on cutting blades of Ni-Ti rotary files might be the preferred sites for the origin of fatigue fracture under experimental conditions. Furthermore this work demonstrates the utility of fractography in evaluating the failure of Ni-Ti rotary flies.