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중국산 석고계 분말형 조강혼화재를 사용한 포졸란재 함유 콘크리트의 물리적 특성 연구
이세현,지석원,이종찬,심종우,박재명 대한건축학회 2007 大韓建築學會論文集 : 構造系 Vol.23 No.3
Gypsum stimulants, a material to promote the Hydrating reaction Of Concrete Containing Pozzolanic Admixture, can obtain necessary solidity in early stage and improve admixture ratio through the promotion of possolanic reaction. Through this research, the research was executed about features of Gypsum Origin Early-strength Powder Type Admixture made in china, now widely used for Concrete Containing Pozzolanic Admixture in domestic and overseas market, and about its solidity and durability features when adapted to concrete. 1) The main components of Gypsum Origin Early-strength Powder Type Admixture are gypsum of 60% ratio. 40% of them are anhydrous gypsum, stimulant to facilitate hydration reaction of cement. 2) I have deduced formula for admixing amount and strength. The strength test till 7th day, showed strong correlation in admixture amount and aging time against strength. When it could make mixture schedule to deduct admixture amount, secure higher effectiveness. 3) The concrete with Gypsum Origin Early-strength Powder Type Admixture implies lower level of carbonation resistance, freezing & thaw resistance, and porous features as the admixture ratio increases. Regarding the variation ratio of length, the mixture ratio, below 0.6, of Early-strength Powder Type Admixture of Gypsum Origin suggests better results than normal concretes. Analyzing above-mentioned total, the optimal mixture amount of Gypsum Origin Early-strength Powder Type Admixture is 0.6% of the entire amount used for the research.
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마이크로웨이브 화학증착법에 의한 다이아몬드 박막의 미세구조오 미세결함
이세현,이유기,박종완,Lee, Se-Hyeon,Lee, Yu-Gi,Park, Jong-Wan 한국재료학회 1996 한국재료학회지 Vol.6 No.8
MPECVD법을 이용하여 다이아몬드 박막을 p형 Si(100)기판 위에 증착하였다. 증착하기에 앞서, 핵생성 밀도를 향상시키기 위하여 40-$60\mu$m 크기의 다이아몬드 분말을 사용하여 6분간 초음파 전처리를 행하였다. 이런 전처리 과정 후, 다이아몬드 박막을 $^900{\circ}C$, 40Torr, 1000W microwave power에서 ${CH}_{4}$와 ${H}_{2}$사용하여 증착하였다. 이렇게 형성된 다이아몬드 박막의 순수도는 Raman spectroscopy로 측정하였으며 박막의 표면은 SEM으로 , 그리고 미세구조와 미세결함은 TEM으로 조사하였다. 반응기체 중 CH4의 농도가 증가함에 따라 다이아몬드의 정형적인 Raman peak와 더불어 다이아몬드가 아닌 제 2상의 peak가 증가하였다. SEM에 의한 박막의 표면은 ${CH}_{4}$가 증가함에 따라 박막의 표면이 뚜렷한 결정형상에서 cauliflower 형태로 변화하였다. 다이아몬드 박막의 결함밀도는 ${CH}_{4}$농도가 증가함에 따라 증가하였으며 결함 중 대부분은 {111}twin이였다. 그리고 MTP(Mulitply Twinned Particle)는 5개의 (111)면으로 형성된 결정으로, 5개의 (111)면은 각각에 대해서 Twin되어 있으며 five-fold symmetry를 나타내었다. 계면에서는 다이아몬드내의 결함들이 핵생성 site를 함유한 작은 지역에서부터 V형재로 퍼져 나갔다. Diamond thin films were deposited on p-type (100) Si wafers using MPECVD. Prior to deposition, ultrasonic striking was done to improve density of nucleation sites with dimond powder of 40~$60\mu$m size. Then diamond thin films were deposited at $^900{\circ}C$, 40Torr and 1000W microwave power using ${CH}_{4}$ and ${H}_{2}$ gases. The purity, the morphology and the microstructur'e and microdefects of diamond thin films were characterized by Raman spectroscopy, SEM and TEM, repectively. In Raman spectroscopy the peaks of non-diamond phase increased as ${CH}_{4}$, concentration increased. In SEM, the morphology of diamond thin films varied from crystalline to cauliflower as ${CH}_{4}$, concentration increased. As ${CH}_{4}$ con centration increased, the density of defects increased, with most defects being {III} twin. ${MTP}_{5}$, were formed with five (II]) planes. As these (Ill) Planes were twinned, ${MTP}_{5}$, represented five-fold symmetry. ]n the interfaces, defects in diamond thin films fanned out from small regions implying nucleation sites.
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이세현 群山敎育大學 1972 論文集 Vol.5 No.-
Ⅰ. INTRODUCTION A national flag is a symbol of power and glory as well as existance of its nation. So we may well be respectful to our national flag. The purpose of this study is to reflect on the historical background and circumstances enacting the Tae-guek flag as the national flag of Korea, research on the actual condition of respect for the flag, and then get reference data which are necessary for education of guiding the respect for it. Ⅱ. FINDINGS OF THE STUDY 1. The Tae-guek flag has been misunderstood up to now to be deviced by Young-Hyo Park for the first time in a ship which be travelled over as an envoy to Japan in 1882, but in fact it has been brought to light that be only reformed the diagram into the four divination signs from the eight divination signs in the flag, which had already been designed long since, after obtaining the King Gojong's informal consent. 2. The results of this research on the respect for the Tae-guek flag have come to light as follows. 1) 50% of 418 students researched admit that they neglect to keep their own Tae-guek flag. 2) Only 1.4% know the meaning of the flag, but 52.9% don't. 3) Only 2.2% are convinced that they can make the flag correctly. 4) Only 8.6% remember that since when the flag has been enacted as our national flag, but 62.7% don't. 5) Students who know how to hoist the flag exactly form 51.7%. 6) 31.6% think that they always have respect for the Tae-guek flag and 64.1% don't. Ⅲ. CONCLUSION Some suggestions for the improved guidance of respect for the Tae-guk flag are as follows. 1. Various schools have to guide the meaning of the Tae-guek moderately for their students in every grade. 2. The guidance of respect for the Tae-guek shall be studied in a practical way through concrete experiences. 3. The way to keep and hoist our national flag shall be guided to people in every community all over the country, as well as in the school, by various social organizations and mass communication. 4. The government authorities concerned have to condition in advance the Tae-guek flag for sale permit only the ones with correct diagram to be sold.
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이세현,이상연,양희동 한국지식경영학회 2023 지식경영연구 Vol.24 No.3
가상자산 시장의 가파른 성장과 함께, 가상자산 상장 및 거래 절차에 대한 정부 차원의 규제가 가해질 전망이나, 구체 적인 규제 방안은 부재한 상황이다. 향후 안정적인 제도권 편입을 위해서는 시장 생태계 조성과 투자자 보호를 위한 더 욱 구체적인 규제 방안이 필요하다. 따라서 본고에서는 국내 5대 가상자산거래소의 자체 가이드라인과 한국거래소의 예 비상장심사기준(2022)을 비교하였다. 본고에서는 IEO, IPO, ICO의 개념을 정의하고 IEO의 이해상충 문제를 명시하였다. 이후, 규제 방안을 제시하기 위해 실제 상장 폐지된 가상자산의 사례를 분석하고 문제점을 유형별로 분류하였다. 또한 유가증권 시장 상장 심사 가이드라인을 형식적 심사 요건과 질적 심사 요건으로 분류하고, 질적 심사 요건은 기업의 계 속성, 경영 투명성, 경영의 안정성, 주식회사 속성 및 투자자 보호 총 네 가지 기준으로 분류하였다. 또한, 사례 분석을 통해 얻은 구조적인 문제를 보완할 수 있는 방안을 제시하였다. 이 방안은 지배 구조 정기 공시, 유통량 정기 공시, 독립 감사 기관 신설 총 세 가지다. 본고는 기존 연구에서 한발 더 나아가 실제 상장 폐지 사례를 분석하고 그 문제점을 유형 별로 분류하여 개선안을 제시하였다는 점, 유가증권 시장과 가상자산 시장의 유사성을 감안하여 제도권의 프레임워크를 차용하여 보완책을 제시하였다는 점에서 그 의의가 있다. With the virtual asset market's rapid growth, government regulations on listing and trading procedures are expected. However, specific measures are currently lacking. To ensure stable inclusion in the institutional framework, precise regulations are needed for market development and investor protection. This study compares self-regulatory guidelines of the top domestic virtual asset exchanges with Korea Exchange's Preliminary Listing Examination Standards (2022) to enhance timeliness and relevance. It defines IEO, IPO, and ICO concepts and addresses conflicts of interest in IEO. Analyzing delisted virtual assets, it categorizes issues and classifies listing examination guidelines into formal and qualitative requirements. The study examines self-regulatory guidelines based on continuity, transparency, stability, corporate characteristics, and investor protection criteria, along with five special requirements for virtual assets. Improvement measures include regular disclosures of governance structure, circulation volume, and the establishment of independent audit institutions. This research further analyzes delisting cases, classifies issues, and proposes solutions. Considering stock market similarities, it offers measures based on the institutional framework.
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