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한재현,문채주,장영학,최만수,김영곤,정문선,Han, Jae-Hyeon,Moon, Chae-Joo,Chang, Young-Hak,Choi, Man-Soo,Kim, Young-Gon,Jeong, Moon-Seon 한국전자통신학회 2015 한국전자통신학회 논문지 Vol.10 No.11
In this paper, 1-axis tracking mechanism of solar-cell panel, which is able to rotate from -90 degree to +90 degree for maintaining always perpendicular between solar-cell panel and sun, was analyzed. This paper propose the non-linear shaped guidance and analyze mathematical formulation of non-linear shape. This analysis shows that it is able to identify the non-linear shaped guidance. Especially, even though the length of rotating link have changed, the non-linear shaped guidance could be confirm with proper size. As effectiveness of this result, 10% efficiency rising is estimated compared to the conventional 1-axis tracking mechanism and also optimal non-linear shaped guidance can be suggested for various size of solar-cell panel. Therefore the flexible mass-production is possible for various size of non-linear shaped guidance. 본 논문에서는 태양전지를 태양과 항상 법선 방향이 되도록 하기 위해 수평방향으로 놓여진 태양전지판을 ${\pm}90^{\circ}$까지 대칭 회전 가능토록 하는 비선형형상의 가이드홈을 가진 단축 추적장치를 제안하고, 비선형형상에 대한 수식을 정립하고자 한다. 그 결과 가이드 홈의 비선형 형상을 확정할 수 있었고, 특히 회전 링크의 길이가 달라져도 회전링크의 길이를 반영하는 가이드 홈을 정확히 확정할 수 있다. 이를 통해 기존의 1축 추적장치에 비해 약 10%이상의 태양전지 효율향상이 가능하며, 또한 어떤 크기의 태양전지판에 대해서도 최적의 비선형 형상 가이드 홈을 갖는 가이드 부재를 제공할 수 있고 대량 생산도 가능하다.
한재현 ( Han Jae-hyeon ) 숭실대학교 인문과학연구소 1994 인문학연구 Vol.24 No.-
The purpose of this paper is to analyze the syntactic structures of the small clauses in English and Korean and to make a cross-linguistic generalization. In Section 2, previous studies are reviewed on the clausal complements of verbs. The clausal complements can be subclassified into three types : full clauses, exceptional clauses, and small clauses. The distribution of each type is dependent upon the semantic and syntactic properties of the main verb. In Section 3, we consider the syntactic and semantic properties of the small clauses which function as the complement of the main verbs. To date, the small clauses have been analyzed as nine different syntactic categories : that is, S’, IP, I’, AP, A’, μP, PrP, etc. Among them, the PrP analysis seems to be the most adequate in explaining English sentences and the small clause constructions. In Section 4,the PrP analysis is applied to some structures of Korean and a cross-linguistic generalization is attempted. The findings suggest that the PrP analysis of apparent small clauses in Korean is inappropriate because embedded sentences in Korean can freely take either overt or covert tense morphemes. However, the PrP analysis seems to be useful with the double object constructions in Korean. Consequently, the PrP is an integral abstract syntactic category under the VP-internal subject hypothesis in the discussion of phrase structure rules of English and Korean sentences.
한재현 ( Han Jae-hyeon ) 숭실대학교 인문과학연구소 2004 인문학연구 Vol.34 No.-
The increasing emphasis on the practical aspect of English education in Korea has caused a great anxiety about the identity and status of English Studies at universities. The main reason for the alarm seems to be the rapid growth of the fields of English Linguistics and Language Education within English department, which some people believe has led to the declining of the studies of English literature and consequently threatened the status of English Studies in general. My essay looks at the history of English Department at Soongsil University for the past fifty years and suggests that the status of English Studies in Korea is actually on the rise. I will pay special attention to the number of faculty and changes in the curricula in my examination of the development of English Department at Soongsil. Statistics shows that the proportion of native speakers on the faculty in English Department has been considerably high, especially in 1970s and early 1980s. Although there are obvious problems with hiring too many native speakers--for example, most of them are not qualified to teach specialized topics of English Studies such as literary or linguistic theories-it has some positive effects, as is illustrated by the success of Soongsil graduates in the job market in 1970s and early 1980s. Compared with students from competing universities, these students were well trained in writing and speaking in English. A close look at the changes in the curricula also demonstrates the efforts the department has been making in order to help the students prepare for their future careers: the most important goal of curriculum development has been providing students with balanced education in English literature, linguistics, and language education. I conclude my essay by suggesting that we should develop English Department into English College that will extend the benefits of education in critical thinking, speaking, and writing skills to students from other disciplines.
황정택,김종학,전주연,한재현,Hwang, Jeong Taek,Kim, Jong Hak,Jeon, Ju Yeon,Han, Jae Hyeon 한국안전학회 2017 한국안전학회지 Vol.32 No.5
This paper is to introduce the main modeling assumptions and data structures associated with right-censored data to describe the successful methodological ideas for analyzing such a field-failure-data when components operating in different environments. The Kaplan - Meier method is the most popular method used for survival analysis. Together with the log-rank test, it may provide us with an opportunity to estimate survival probabilities and to compare survival between groups. An important advantage of the Kaplan - Meier curve is that the method can take into account some types of censored data, particularly right-censoring. The above non-parametric method was used to verify the equality of parts life used in different environments. After that, we performed the life distribution analysis using the parametric method. We simulated data from three distributions: exponential, normal, and Weibull. This allowed us to compare the results of the estimates to the known true values and to quantify the reliability indices. Here we used the Akaike information criterion to find a suitable life time distribution. If the Akaike information criterion is the smallest, the best model of failure data is presented. In this paper, no-nparametrics and parametrics methods are analyzed using R program which is a popular statistical program.
최적열차 운행계획을 수립하기 위한 운전이론 영향인자 분석
김선엽(Seon-Yeop Kim),김성준(Seong-Jun Kim),한동현(Dong-Hyun Han),정덕수(Duck-Soo Jeong),이준형(Jun-Hyung Lee),한재현(Jae-Hyeon Han),박정수(Jung-Soo Park),유가현(Ga-Hyun You) 한국철도학회 2019 한국철도학회 학술발표대회논문집 Vol.2019 No.5
4차 산업혁명과 과학기술의 발달에 힘입어 열차의 동력원이 증기, 디젤, 전기, 자기부상, 진공튜브 순으로 발달하고 있으며 또한 철도시설물의 개량 및 발전으로 열차 운행속도는 더욱더 빨라져 운전이론에 따른 열차운전계획이 매우 중요한 시점이다. 현대사회에서 인구증가와 고객 편의 향상을 위해 열차의 짧은 배차간격 · 대용량 수송의 필요함이 증대되면서 운영의 효율성 측면과 철도사고의 위험성 측면에서도 더욱 안전하고 합리적 · 경제적인 열차운행계획 정립이 필요하다. 따라서 본 연구에서는 운전역학, 운전이론, 속도정수, 운전계획 등 효율적인 열차운행계획에 영향을 주는 운전이론 영향인자를 분석하여 안전을 최우선으로 하는 최적의 운전계획수립에 기여코자 한다.