韓國 行政境域의 接觸性 硏究

李聖學 慶北大學校 1980 論文集 Vol.30 No.-

1. The administrative boundary of Korea in largely established by its topograpical condition, and its social background. However, its administrative districts are analogous to the hexagonal region model of Christraller and Lo¨sch's central place theory as the mean contact number of boundaries is 5 to 6. 2. The correlation coefficient between the contact number of the administrative boundaries and an index of boundary flexure, an index of shape, and area size which are concerned with the contact number is 0.5 respectively on the average. In boundary, and a rank of area size is about 0.8, we find that it applies to the so called "Magnetic Domain Theory". 3. I'll explain later the correlation between the contact of administrative boundary and a transportation sphere, a cultural sphere, and an economic sphere respectively.

朝鮮時代 行政區域制의 歷史地理性 : 時代的 地域特性

李聖學 慶北大學校 1983 論文集 Vol.36 No.-

1) The administrative district system of Josun(朝鮮) established in Taejong(太宗) 13th year (A.D. 1413), which had not been nearly changed in its basic system for about 480 years until the eight province (Do : 道) system was abolished in Gojong(高宗) 32nd year (A.D. 1895). 2) The administrative district system of Josun(朝鮮) was devided into eight provinces (Do:道) besides a independent province, Hanseong-bu(漢城府) including a capital. They had jurisdiction horizantaly over 330 districts such a Bu(府), Dae-Dohobu(大都護府), Mok(牧), Dohobu(都護府), Kun(郡), Hyun(縣) 3) The size(in productive land and population) of districts was generally related to district names, and its relationship was closer in the latter period of Josun(朝鮮) than the former period. 4) The change of district names was partly due to historical change of geography, but mainly due to social change. 5) The special administrative districts of Josun(朝鮮), Bugok(部曲), Hyang(鄕), and So(所) was reorganized to Hyun(縣) or Chon(村) in the latter period of Josun(朝鮮), and so they were almost abolished.

HEA 변형 거동의 이해와 기계적 물성 향상 방안

이성학,손석수,조용희 대한금속재료학회(구 대한금속학회) 2017 재료마당 Vol.30 No.1

韓國 行政區域의 「郡」에 關한 歷史地理

李聖學 慶北大學校 1982 論文集 Vol.33 No.-

1) At the age of "Han-Sa Gun"(漢四郡), the "Gun"(郡) system had "Hyun"(縣) in its area. But, after the "Sam-Guk6(三國) age, "Gun" and "Hyun" had its own province, ie, it had its originality. 2) The ascent and descent of the name of "Gun"(郡) was mainly due to the reasous of the king's household, a meritorious retainer, a rebellious subject and a criminals, etc. 3) However, Nowodeuys "Gun"(郡) system is based on the reorganization of an administrative district at the age of Japan-empire. At that time, the whole country was divided into 13 provinces and 220 "Gun"s under them.

韓國 特殊行政區域의 時代的 地域特性 : 沿革·位置·分布·規模·性格의 歷史地理性

李聖學 경북대학교 사회과학대학 1985 社會科學 Vol.4 No.-

1. The name of Hyang(鄕), So(所), Pu-gok(部曲), Jang(莊) and Cheo(處) are special districts. It were exist from the Silla(新羅) down to the early Cho-sun(朝鮮). The Pu-gok is still the middle Cho-sun(朝鮮) in exitence. 2. Those districts were connected with convict and a producing center of special products. Therefore disregard with inhabitants and districts. Moreover it has regulation of administration. 3. Those districts were distributed mainly borderland or perforate area. So boundary line was formed without relate topography. 4. Those districts were not fixed. The change and the maintenance were variation according to the time and the locality. 5. Those districts were vary in size. The place-name are scarcely ever till now, because of don't desire look back into the past.

韓國城郭小考

李聖學 啓明基督大學 1964 合同論文集 Vol.1 No.-

An effort is made here to study the historical changes of the castles in Korea from the history-geographical point of view to defin,e theircharacteristics. Castles were built to defend their in-dwellers from enemies and social unrest, and they were developed by the influence of Chinese ideas about castles. Most of these castles were scattered along the northern border line and southern coast line against Japan. There were Five different kinds of castles, viz. Do-Sung, San-Sung and Up-Sung etc all of which were on a single, s mall scale design. Viewed from the light of the causes of castle formation, and of the forms, the castles bear not only national defensive meaning but also social and civiI meanings. As the demands of the society changed, castles untiI recently prevalent remain only for guesses of histonical significance.

대기 플라즈마 용사법으로 제조된 철계 코팅층의 미세구조와 내마모성

이성학,황병철,안지훈 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.9

The objective of this study is to investigate the correlation of microstructure, wear resistance, and surface roughness in ferrous coated layers applicable to cylinder bores. Four kinds of ferrous spray powders, two of which were STS 316 steel powders and the others were blend powders of ferrous powders mixed with 20wt.% Al₂O₃-ZrO₂powders, were sprayed on a low-carbon steel substrate by atmospheric plasma spraying. Microstructural analysis of the coated layers showed that iron oxides were formed in the austenitic matrix by oxidation during spraying for the STS 316 coated layers, while Al₂O₃-ZrO₂oxides were mainly formed in the martensitic matrix for the blend coated layers. The wear test results revealed that the blend coated layers showed the better wear resistance than the STS 316 coated layers because they contained a number of hard Al₂O₃-ZrO₂oxides. However, they had rough worn surfaces because of the preferential removal of the matrix and the cracking of oxides during the wear process. The STS 316 coated layers showed the slightly worse wear resistance than the blend coated layers, but they showed the excellent surface roughness resulting from homogeneous wear in oxides and matrix due to the smaller hardness difference between them. In order to improve the overall wear properties with consideration of the wear resistance of a counterpart material and the surface roughness, the hardness difference between the oxides and matrix should be minimized, maintaining the hardness of the coated layer at a certain level by forming an appropriate amount of oxides.

인공신경망모형을 이용한 기온기반 기준증발산량 산정

이성학,김마가,최진용,방재홍 한국농공학회 2019 한국농공학회논문집 Vol.61 No.1

Evapotranpiration (ET) is one of the important factor in Hydrological cycle and irrigation planning. In this study, temperature-based artificial neuralnetwork (ANN) model for daily reference crop ET estimation was developed and compared with reference crop evapotranpiration ( ) from FAO-56Penman-Monteith method (FAO-56 PM) and parameter regionalized Hargreaves method. The ANN model was trained and tested for 10 weather stations(5 inland stations and 5 costal stations) and two input climate factors, maximum temperature (Tmax), minimum temperature (Tmin), and extraterrestrialradiation (RA) were used for training and validation of temperature-based ANN model. Monthly reference ET by the ANN model also compared withparameter regionalized Hargreaves method for ANN model applicability evaluation. The ANN model evapotranspiration demonstrated more accordanceto FAO-56 PM evapotranspiration than the   from parameter regionalized Hargreaves method(R-Hargreaves). The results of this study proposed thatdaily reference crop ET estimated by the ANN model could be used in the condition of no sufficient climate data.

벼의 생식생장기 일조부족이 생육 및 수량에 미치는 영향

이성학,손은호,홍성창,오성환,이지윤,박종현,우선희,이철원 한국작물학회 2016 한국작물학회지 Vol.61 No.2

Recently, rice growth and production have been influenced by climatic change worldwide. In particular, under low solar radiation and cloudy weather, rice plants show abnormal physiological responses. In this experiment, plants of the rice cultivar Samgwangbyeo grown 40% and 70% shading and natural conditions at the primordium initiation stage (PI) for 30 days and the booting stage for 10 days up to heading were compared. After shading treatments, culm lengths were significnatly longer than that in natural condition plots, and panicle lengths were shorter in the 40% and 70% shading treatment plots compared to control plots. After heading, the production of dry matter treated at the PI stage was significantly lower than that at the booting stage. SPAD values of the leaf color and N concentration of leaves treated with shading were greater than those under natural conditions. In the shading treatment, the lodging index at 20 days after heading was significantly higher than that in natural condition. For yield components, number of panicles, spikelet number per panicle, and ripened grain ratio significantly decreased with shading treatment; thus, rice yield decreased significantly. For rice quality, the protein content of the head rice treated with shading was significantly higher than that in the control plot, but the amylose content of rice treated with shading was signifiantly lower than that in rice in control plots.

국제 표준화.시험인증 회의 참가보고 - 제18차 ITU-R WP5D 회의

이성학,오충근,Lee, Seong-Hak,O, Chung-Geun 한국정보통신기술협회 2014 TTA저널 Vol.152 No.-