렌즈 성형품에 대한 사출시간, 충진 압력, 그리고 보강시간의 영향

송영현 한국유변학회 1992 Korea-Australia rheology journal Vol.4 No.2

본 연구에서는 형내압 파형제어 시스템, 초고속, 사출성형, 그리고 금형진공 시스템 등을 갖춘 사출 성형기를 이용하여 정밀 구면렌즈를 성형하기 위한 실험을 수행하였다. 이 러한 목적을 위해 성형공정 변수인 사출시간 충전압력 그리고 보압시간이 성형품에 미치는 영향을 중량과 곡률반경 구면 정밀도 그리고 구면오차의 간접무늬를 측정하여 연구하였다. 그결과로서 성형품의 중량(칫수)과 곡률반경에 지대한 영향력을 행사하는 변수는 충전압력 이며 사출시간과 보압시간은 곡률반경과는 무관해 보이고 중량의 증가에는 기여하지만 공정 사이클 시간을 증가시키는 문제가 지적된다. 구면정밀도 측정실험 결과 길지도 짧지도 않는 15∼20초 사이의 보압시간 4초이내의 빠른 사출시간 그리고 860kg/cm2 이상의 높은 충전압 력에서 우수한 결과를 보여주었다, 마지막으로 구면의 형상에 대한 간접무늬 측정결과는 성 형공정을 이해하는데 강력한 도구가 됨을 발견하였다.

Zn ion의 영향에 따른 $(Y,\;Zn)_2O_3$:$Eu^{3+}$ 적색 형광체의 발광특성

송영현,문지욱,박우정,윤대호,Song, Y.H.,Moon, J.W.,Park, W.J.,Yoon, D.H. 한국결정성장학회 2008 한국결정성장학회지 Vol.18 No.6

본 연구에서는 자외선 영역에서 발광하는 우수한 특성의 적색 형광체를 얻기 위하여 고상 반응법으로 air 분위기에서 $1200^{\circ}C$에서 6시간 동안 열처리하여 $(Y,\;Zn)_2O_3$:$Eu^{3+}$를 Zn 이온의 농도 변화에 따라 실험하였다. $(Y,\;Zn)_2O_3$:$Eu^{3+}$를 XRD에 의해 비교 분석한 결과 주요 peak들이 JCPDS card(No. 41-1105)와 거의 일치하는 것을 확인하였다. 그러나 Zn 이온치 농도가 5 mol% 이상일 때 XRD에서 ZnO의 peak이 관찰되는 것을 확인 하였다. 이로 인하여 Zn 이온의 농도가 5 mol% 이하일 때 불순물 상 없이 $Y_2O_3$ 구조에 잘 고용되는 것을 확인하였다. $(Y,\;Zn)_2O_3$:$Eu^{3+}$의 발광 peak은 여기 흡수 영역인 ${\lambda}ex=254\;nm$를 기준으로 612 nm 영역에서 $Eu^{3+}$ 이온의 $^5D_0{\rightarrow}^7F_2$에 전형적인 에너지 천이에 의해 가장 강한 발광 peak을 나타내는 것을 확인하였으나 Zn 이온의 농도가 10 mo1% 이상일 때 갑자기 발광 peak이 현저히 감소하는 것을 확인하였고 최대의 발광 peak을 가질 때 형광체의 조성은 $(Y_{0.95},\;Zn_{0.05})_2O_3$:$Eu^{3+}_{0.075}$이였고 입자 size는 $0.4{\sim}3{\mu}m$로 확인되었다. To enhance the luminescence properties, the red phosphor composed of $(Y,\;Zn)_2O_3$:$Eu^{3+}$ as doping concentration of Zn ion is synthesized at $1200^{\circ}C$ for 6 hrs in air atmosphere by conventional solid reaction method. As a result of the red phosphor $(Y,\;Zn)_2O_3$:$Eu^{3+}$ is measured X-ray diffraction (XRD), The main peak is nearly corresponded to the same as JCPDS card (No. 41-1105). When the doping concentration of Zn ion is more than 5 mol%, However, the ZnO peak is showed by XRD analysis. Therefore, when the doping concentration of Zn ion is less than 5 mol%, the Zn ion is well mixed in $Y_2O_3$ structure without the impurity phases. The photoluminescence (PL) properties is shown as this phosphor is excited in 254 nm region and the highest emission spectra of $(Y,\;Zn)_2O_3$:$Eu^{3+}$ has shown in 612 nm region because of a typical energy transition ($^5D_0{\rightarrow}^7F_2$) of $Eu^{3+}$ ion. As the doping concentration of Zn ion is more than 10 mol%, the emission peak is suddenly decreased. when the highest emission peak as doping concentration of Zn ion is shown, the composition of this phosphor is $(Y_{0.95},\;Zn_{0.05})_2O_3$:$Eu^{3+}_{0.075}$ and the particle size analyzed by FE-SEM is confirmed from 0.4 to $3{\mu}m$.

형광체 응용기술 소개

송영현,최승희,정호중,김완호,김재필,유성환,전시욱,권석빈,윤대호 한국정보디스플레이학회 2022 인포메이션 디스플레이 Vol.23 No.4

여자 고등학생의 체육수업에 대한 재미거리와 걱정거리 분석

송영현,정용철,이의재 중앙대학교 학교체육연구소 2019 Asian Journal of Physical Education of Sport Scien Vol.7 No.3

The purpose of this study is to find out the fun and worry about physical education class according to school type of high school girls. The survey was distributed to a total of 569 general high school, special purpose high school, and specialized high school students attending A, B, and C in 2018, except for 9 unsuccessfully filled out questionnaires. A total of 560 data were used as the final valid sample of the study. Data processing was performed using frequency analysis, one-way ANOVA, and correlation analysis. The results of the study were as follows: First, the interesting things about physical education class by school type showed significant difference according to school type. Second, concerns about physical education classes by school type also showed significant differences by school type. Third, there was a statistically significant positive correlation between the fun factors and the worry factors. Based on the results of the study, the purpose of the study is to provide basic data on how to design physical education classes according to the type of school and to operate the classes according to the students' level. 본 연구는 고등학교 여학생들의 학교 유형에 따라 체육수업에 대한 재미거리와 걱정거리를 규명하는데 목 적이 있다. 이에 2018년 A시, B시, C시에 재학 중인 일반계 고등학교, 특수목적 고등학교, 특성화 고등학 교 학생 총 569명을 대상으로 선정하여 설문지를 배포했으며 조사 후 회수된 설문지 중 불성실하게 기입 된 설문지 9부를 제외한 총 560명의 자료가 연구의 최종 유효 표본으로 사용되었으며, 자료처리는 빈도분 석, 일원변량분석, 상관관계분석을 사용하다. 연구결과 첫째, 학교 유형에 따른 체육수업에 대한 재미거 리는 학교 유형에 따라 유의미한 차이가 나타났다. 둘째, 학교 유형에 따른 체육수업에 대한 걱정거리 역 시 학교 유형에 따라 유의미한 차이가 나타났다. 셋째, 재미거리 요인끼리의 상관관계, 걱정거리 요인끼리 의 상관관계는 통계적으로 유의한 정(+)의 상관관계가 나타났다. 재미거리의 하위 요인별 건강유지, 성취 감, 수업의 용이성, 수업의 자유로움, 사회성 함양은 걱정거리의 하위요인인 운동종목걱정, 수업준비사항 걱정, 수업환경걱정, 운동기술 수행걱정, 처벌걱정, 수업 중 마찰걱정과 통계적으로 유의한 부(-)의 상관관 계가 있는 것으로 나타났다. 연구의 결과를 토대로 학교 유형에 따라 어떻게 체육수업을 설계하고 학생의 눈높이에 맞춰 수업을 운할 것인지에 대한 기초자료를 제공하는데 연구의 의미를 두고자 한다.

[외국정책사례] 샤오허즈지에<SUP>小河直街</SUP> 역사거리의 노후주거지 재생

송영현 한국자치학회 2018 월간 공공정책 Vol.153 No.-

Simultaneous hydrogen production and struvite recovery within a microbial reverse-electrodialysis electrolysis cell

송영현,Syarif Hidayat,Agus Jatnika Effendi,박주양 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-

In this research, a novel Microbial reverse-electrodialysis electrolysis struvite-precipitation cell (MRESC)was developed for energy recovery through struvite (MgNH4PO4 6H2O) crystallization and hydrogenproduction concurrently in a single process without any electrical-grid energy consumption. This hybridsystem can effectively transfer the salinity gradient energy to electrical energy as a driving force toproduce hydrogen gas coupled with struvite recovery and organic wastewater degradation. A MRESCcontaining 10 pairs of RED cells, supplied solutions typical of high concentration (600 mM NaCl) and lowconcentration (12 mM NaCl) at 1.0 mL/min, was operated in the fed-batch mode. The rates of hydrogenproduction and struvite crystallization were determined to be 0.71 m3-H2/m3-Van/d and 7.62 g/m2/h,respectively. The gas produced was >92% H2. The Coulombic efficiency was close to or above 100% with aCOD removal of 84 6%, and an overall energy efficiency of 28%. The morphology and structure of themain component of accumulated crystal at the cathode were verified by a scanning electron microscopewith energy dispersive spectroscopy (SEM-EDS) and X-ray diffraction. These results showed that theMRESC system could be used as an effective bioelectrochemical method for energy recovery in the formof pure hydrogen gas and struvite simultaneously.

블록체인 기술의 사회에서의 보편적 활용을 위한 규범성 고찰

송영현 경북대학교 IT와 법연구소 2021 IT와 법 연구 Vol.0 No.22

This study handles the legal issues in relation to social changes brought by blockchain technology connected to artificial intelligence. Concretely, this study aimed to seek the possibility to secure the normativity implying legal meanings as a countermeasure for giving social legitimacy to various digital acts based on blockchain technology that could be the advanced scientific technology of modern times. Thus, this study also mentions the value and characteristics of legal norms according to legal acts applied with blockchain technology. As one of the core powers in the 4th industrial revolution era, the blockchain technology is widely-known as technology that would change the industrial structure. The blockchain technology that could be used for financial area such as payment/settlement or stock exchange, electronic notarization, smart contract, establishment of transaction network, easy login program, and government use could become a core digital service that could accelerate new lifestyles. Nevertheless, this is still a controversial issue. As an example, there is a problem of cryptocurrency like Bitcoin. Bitcoin is digital cryptocurrency based on blockchain technology. The recognition as currency that could be used as a payment method in social transaction was good enough to raise social interest in Bitcoin. Even though Bitcoin was expected to show equal use equipped with universality, in reality, there are some problems like concentrated possession or intervention of speculative elements. For this reason, the problems like regulation or control of cryptocurrency are raised by highlighting the stability of trading system. However, the blockchain technology has the high applicability to sharing economy, public sector, and market as it could greatly reduce complex transaction process and cost, so many people argue the necessity to find the measures for absorbing it into social system somehow. The blockchain technology is neither settled, nor stable as it is under development yet. And it could also have side effects like technical aggression such as cyber hacking or privacy violation, which makes people demand for giving the legal character to this series of processes. In other words, to establish and settle down the blockchain-based identity authentication or universality as a service model, it would be preferentially required to secure not only the technical stability, but also the normativity as a scale. Meanwhile, in the present time point moving toward the hyper-connectivity and hyper-intelligence era, it is quite difficult to predict the future environment as it is interlinked with concentration of wealth and digital information gap, which should be also considered in relation to this problem. For this reason, some people remind of its adverse effect and feel afraid of life changes that could be brought by the development of scientific technology. And the safety system to get rid of such uncertainty and fear is legal norms. In order for blockchain technology with infinite potential to be used while its security and transparency are guaranteed and all sorts of social risks are removed, it would be needed to perform policy-level reviews and also to enact a suitable law in time. For legal assessment, there should be legal facts. In extended society, the legal acts based on blockchain technology are the existing reality and phenomenon. Giving the normativity to it should be more carefully approached as our laws guarantee the development of scientific technologies.

Artificial Intelligence: Cultural Imagination and Social System

송영현,이혜경 한국융합학회 2019 한국융합학회논문지 Vol.10 No.8

The aim of this study is to explore the paradigm shifts in culture and system related to life in terms of AI and the present point of view in which creating human values ​​together are important. An approach that focuses on how AI-related phenomena work in modern society forms the basis of this research. Therefore, to clarify the meaning of “AI phenomenon” converging it as a part of social culture, this study was intended to find out the value incorporated in the social system such as ethics and equality together with the literature review. Inferring the technical culture that are combined with the AI ​​that the members of society can do together is as important as technical understanding in the functional aspect. Therefore, this study was intended to suggest new culture that the cultural imagination and the social system create harmonizing each other, that is, the possibility of "AI culture". So, this article has a characteristic of a preliminary study, too.

Zn ion의 영향에 따른 (Y, Zn)₂O₃: Eu³+ 적색 형광체의 발광특성

송영현,문지욱,박우정,윤대호 한국결정성장학회 2008 한국결정성장학회지 Vol.18 No.6

To enhance the luminescence properties, the red phosphor composed of (Y, Zn)₂O₃ : Eu³+ as doping concentration of Zn ion is synthesized at 1200℃ for 6 hrs in air atmosphere by conventional solid reaction method. As a result of the red phosphor (Y, Zn)₂O₃ : Eu³+ is measured X-ray diffraction (XRD), The main peak is nearly corresponded to the same as JCPDS card (No. 41-1105). When the doping concentration of Zn ion is more than 5 mol%, However, the ZnO peak is showed by XRD analysis. Therefore, when the doping concentration of Zn ion is less than 5 mol%, the Zn ion is well mixed in Y₂O₃structure without the impurity phases. The photoluminescence (PL) properties is shown as this phosphor is excited in 254 nmregion and the highest emission spectra of (Y, Zn)₂O₃ : Eu³+ has shown in 612 nm region because of a typical energy transition (5D0→7F2) of Eu³+ ion. As the doping concentration of Zn ion is more than 10 mol%, the emission peak is suddenly decreased. when the highest emission peak as doping concentration of Zn ion is shown, the composition of this phosphor is (Y0.95, Zn0.05)₂O₃ : Eu³+ 0.075 and the particle size analyzed by FE-SEM is confirmed from 0.4 to 3 μm.

고향사랑기부제의 재정확충효과 모의실험 - 충청남도를 사례로 -

송영현 재단법인 경기연구원 2023 GRI 연구논총 Vol.25 No.3

As the development gap between local governments in South Korea continues to widen, academic and policy sectors are making efforts to reduce the disparity and revitalize underdeveloped regions. One of the policy initiatives introduced for this purpose is the “Hometown Love Donation Policy”. However, there is still a lack of in-depth discussions regarding the policy’s effectiveness, particularly in terms of its specific financial expansion impact, which is of great interest to individual local governments. Based on the above, this study conducted a policy simulation of the financial expansion impacts of the Hometown Love Donation Policy in Chungchengnam-do. The results are as follows : Chungcheongnam-do is expected to bring financial expansion impacts ranging from at least 2.27 billion KRW to as much as 238.41 billion KRW. Depending on policy scenarios that consider realistic motivations for individuals to donate to the Hometown Love Donation Policy, which is tax deductions, the expected financial expansion impacts range from a relatively lower level of 2.27 billion KRW to 78.39 billion KRW. We derived policy implications for local governments in Korea, including Chungcheongnamdo from the previous analysis. Local governments need to establish strategies for utilizing the policy, based on understandings of the operational principles of the policy and the actual scale of financial impacts. In doing so, it would be necessary to consider fostering industries and companies related to return presents of the policy for the regional economic development. 우리나라 지자체 간의 발전격차가 점차 심화됨에 따라 격차를 줄이고 저발전 지자체에 새로운 동력을 불어넣기 위한노력이 각계에서 이뤄지고 있다. 이러한 노력 중 하나로 등장한 것이 바로 고향사랑기부제이다. 그러나 아직 고향사랑기부제의 정책효과에 대한 깊이 있는 논의가 부족한 실정이며, 특히 개별 지자체들이 큰 관심을 갖고 있는 재정확충효과에대한 구체적인 검토가 미진하다. 상기 배경에서 본 연구는 충청남도를 대상으로 하여 고향사랑기부제의 재정확충효과에대한 시나리오를 도출하고 모의실험을 실시하였다. 결과는 다음과 같다. 충청남도는 고향사랑기부제를 실시함으로써 적게는 22.7억원에서 많게는 2,384.1억원에 이르는 재원확충효과를 거둘 것으로 예상되었다. 고향사랑기부금을 기부하는현실적인 동기인 세액공제의 관점을 추가한 시나리오들에 따르면, 위보다 상대적으로 낮은 수준인 22.7억원에서 783.9억원 사이의 지방재정확충효과가 예상된다. 분석결과를 통해 충청남도를 비롯한 우리나라 지자체들을 위한 정책적 시사점을 도출하였다. 지자체들은 제도의 운영원리와 실질적인 재원확충 규모 파악을 전제로 하여 제도의 활용전략을 마련할필요가 있다. 이 때 답례품 관련 산업과 기업을 육성하여 지역경제 활성화를 함께 도모하는 방안을 검토해야 할 것이다.