이축압출을 활용한 무기입자 폴리우레탄 용융혼련 PET 코팅사 제조 연구

유성욱,이기봉,안지훈,최주환 한국섬유공학회 2021 한국섬유공학회지 Vol.58 No.6

This study investigates the use of inorganic fillers (CaCO3, ZnO, ZrO2, and TiO2)with thermoplastic polyurethane (TPU) as polyethylene terephthalate (PET) coating yarnsto improve their mechanical properties. TPU is the most widely used coating material forthermal melting because of its excellent mechanical properties, functionality, andprocessability. The mechanical properties (e.g., tensile strength and tensile strain) andthermal properties of prepared TPU compounds were investigated with differentinorganic filler contents. TPU resin was melt-mixed using a twin-screw extruder foruniform mixing by filler type and inorganic particle concetration. The core PET yarns weremelt-coated without thermal decomposition at approximately 200 °C. The properties ofthe inorganic filler/TPU compound were analyzed by a universal testing machine, Fouriertransforminfrared spectrometer, differential scanning calorimeter, and dynamicmechanical analysis. The dispersibility of inorganic fillers (ZnO and TiO2) in the TPUs wasbetter than that of CaCO3 and ZrO2. The mechanical properties, thermal properties, andscanning electron microscopy images are ranked in the following order: TiO2 > ZnO >ZrO2 > CaCO3.

과로사 인정기준에 관한 대법원 판례 경향에 대한 연구

유성욱,유성호 대한법의학회 2011 대한법의학회지 Vol.35 No.2

The purpose of this study was to review the tendency of the Supreme Court’s test for death from overwork (so called ‘Karoshi’). Using inner-network of court, we analyzed judicial tests from 2000 to 2010, associated with claimed death from overwork and/or psychological stress. Judicial tests were classified according to the clarification of cause of death and preexisting diseases. Through analyzing relevantly the tests for death from overwork, the authors found that many tests have emphasized the necessity of forensic autopsy to elucidate the proper casual relationship between death and overexertion. This study also shows recent changes in judicial tests based on the latest medical knowledge. Therefore, it is suggested that social issue on forensic autopsy system need to recall Korean society to establish the clarification of the proper casual relationship associated with death from work as well as social justice.

Searching for the Buddhist Sect Which Propagated the Worship of the Buddha Image

유성욱 동국대학교 불교학술원 2012 International Journal of Buddhist Thought & Cultur Vol.18 No.-

From the viewpoint of political history, the Post-Mauryan period, which began with the breakdown of centralized Mauryan authority, was characterized by the rapid loss of Mauryan political sovereignty, i.e., the establishment of various dynasties by foreign invaders. In this process of political change, northwest India experienced not only economic growth through trade and coinage, but also socio-cultural change. Religions, including Buddhism, also entered a new phase due to the spread of bhakti ideas which became the theoretical basis of the religious change. At that time, the gods of early Hinduism were becoming increasingly well defined and distinct as objects of devotion, and one of the Buddhist sects, whose activities were centered in northwest India in the cities of Gandhāra and Mathurā must have been influenced by this tendency toward the personification of deities and the subsequent direct, emotional worship practiced by their devotees. This is, therefore, an attempt to identify that Buddhist sect which theoretically and literally contributed to the deification of the Buddha and led to the popularization of worshiping his image around the world.

Sextic moment problems on 3 parallel lines

유성욱 대한수학회 2017 대한수학회보 Vol.54 No.1

Sextic moment problems with an infinite algebraic variety are still widely open. We study the problem with a single cubic column relation associated to 3 parallel lines in which the variety is infinite. It turns out that this specific column relation has a strong connection with moment problems that have a symmetric algebraic variety. We present more concrete solutions to some sextic moment problems with a symmetric variety.

공표지침 및 사건처리절차 개정 주요내용

유성욱,Yu, Seong-Uk 한국공정경쟁연합회 2006 경쟁저널 Vol.- No.127

서평 : 베다 점성학의 특징과 원리 해명 -데이비드 프라울리의 『예언자들의 점성학』을 읽고

유성욱 한국불교사연구소 2009 문학/사학/철학 Vol.18 No.-

대학 교양교육과정의 종교 교과 운영에 대한 고찰

유성욱 한국종교교육학회 2020 宗敎敎育學硏究 Vol.63 No.-

4차 산업혁명이라는 생산방식의 변화에 따른 미래사회의 불투명성과 과학기술 발전에 대한 사회적 우려와 요구는대학 교양교육과정에도 많은 변화를 가져왔다. 지난 2주기 대학기본역량진단 이후 대학들은 교육과정에 '4차 산업혁명’, '융복합’, '역량’ 등의 키워드를 반영하기 위해 분주하다. 우리가 그 방향성에 대해 동의하든 그렇지 않든 교양교육의 지형변화는 진행 중이며, 3주기 진단 결과에 따라 가속화될 가능성이 크다. 이러한 변화의 추세에 다소 뒤늦은 감은있지만 이제라도 종교 교육 분야에서 기존 대학 교양교육과정에서 종교 교과 편성 및 운영의 문제점을 진단하고 앞으로의 방향성에 대한 논의가 필요하다. 이러한 문제의식에서 이 논문은 종교 교과에 대한 분석 자료를 토대로 몇 가지 제안을 하였다. 첫째, 종립대학 선택교양의 종교 교과목에 나타난 종단 편향성을 탈피하자는 것이다. 교과목명과 달리 내용요소가 특정 종교에 제한되는 교과목은 내용요소의 종교별 균형성을 복원하는 방향으로 개선이 필요하다. 둘째, 인성교육을 표방한 종단 과목은 종교교육을 인성교육 범주로 제한하며 종교 교과의 지평을 축소시킨다. 따라서 대학의 인성교육 과목들의 탈종단화가 필요하며, 해당 교육은 종교기관에 이관하거나 연계를 통한 비교과 프로그램으로 운영하는 방안을 제시해본다. 셋째, 종교교과의 과목 개발과 기존 과목의 개선 노력이 필요하다. 넷째, 종교 교과목 담당교수의 교수법 개선이 요구된다.

Consistency and General truncated moment problems

유성욱 충청수학회 2018 충청수학회지 Vol.31 No.4

The Truncated Moment Problem (TMP) entails finding a positive Borel measure to represent all moments in a finite sequence as an integral; once the sequence admits one or more such measures, it is known that at least one of the measures must be finitely atomic with positive densities (equivalently, a linear combination of Dirac point masses with positive coefficients). On the contrary, there are more general moment problems for which we aim to find a ``signed'' measure to represent a sequence; that is, the measure may have some negative densities. This type of problem is referred to as the General Truncated Moment Problem (GTMP). The Jordan Decomposition Theorem states that any (signed) measure can be written as a difference of two positive measures, and hence, in the view of this theorem, we are able to apply results for TMP to study GTMP. In this note we observe differences between TMP and GTMP; for example, we cannot have an analogous to the Flat Extension Theorem for GTMP. We then present concrete solutions to lower-degree problems.

The Cayley-Bacharach theorem via truncated moment problems

유성욱 강원경기수학회 2021 한국수학논문집 Vol.29 No.4

The Cayley–Bacharach theorem says that every cubic curve on an al- gebraically closed field that passes through a given 8 points must contain a fixed ninth point, counting multiplicities. Ren et al. introduced a concrete formula for the ninth point in terms of the 8 points [4]. We would like to consider a different approach to find the ninth point via the theory of truncated moment problems. Various connections between algebraic geometry and truncated moment problems have been discussed recently; thus, the main result of this note aims to observe an interplay between linear algebra, operator theory, and real algebraic geometry.

MOCVD법에 의한 TiO2 박막의 제조에 미치는 산소의 영향

유성욱,박병옥,조상희,Yu, Seong-Uk,Park, Byeong-Ok,Jo, Sang-Hui 한국결정학회 1995 韓國結晶學會誌 Vol.6 No.2

화학증착법에 의해 TiO2 박막을 Si-wafer(100)위에 제조하였다. Titanium tetraisopropoxide (TTIP)를 출발물질로 하여 200-500℃의 온도범위에서 증착을 행하였다. 증착된 박막의 두께는 Ellipsometry 및 SEM을 사용하여 측정하였으며, 산소의 함량에 따른 증착층의 성분분석은 ESCA를 사용하였다. TiO2 박막의 증착속도는 산소의 함량에 따라 증가하였고, 반응가스인 산소를 공급하지 않았을 때 증착층내에 불순물로 탄소가 존재하였으며, 증착층의 성분은 내부로 갈수록 TiO2에서 Ti로 변하였다. 산소를 600scm 공급하였을 때 증착층내에 소량의 탄소가 존재하였으며, 증착층의 성분은 내부로 갈수록 TiO2에서 TiO, Ti로 됨을 알 수 있었다. 산소를 1200scm공급하였을 때 증착층내에 탄소가 존재하지 않았으며, 증착층 성분은 표면에는 TiO2를 이루나 증착층 내부로 갈수록 Ti복합화합물을 이루고 있었다. TiO2 thin films were prepared on a (100)silicon wafer using a chemical vapor deposition(CVD) method. The deposition experiments were performed using the TTIP in the deposition temperature ransing from 200 content. The deposition rate of TiO2 was increased with the substrate temperature and the oxygen content. The thickness of the deposited thin film and the compositional analysis of this thin films with theoxygen content were measured using Ellipsometry, SEM and ESCA, respectively. The deposited thin film was composed of a bilayer, external TiO2 and internal Ti. Carbon as a residual impurity was found to remain when zero sccm O2 was purged into a reaction chamber and the composition of the deposited thin film was found to change Ti into TiO in a deeper layer. However, when 600sccm O2 was supplied to a reaction chamber, it has been found to reside less carbon content than without O2. Finally, in the condition of 1200sccm O2, no impurity level of carbon was observed and a deeper layer consisted of the Ti composite, even though the deposited surface was composed of TiO2.