가스 수소 장입 조건 제어를 통한 SA-723 강의 수소 취화 특성 평가

이강진,김정환,이화영,김도훈,홍순직,송기안 한국열처리공학회 2023 熱處理工學會誌 Vol.36 No.6

In this study, hydrogen embrittlement (HE) behavior of a SA-723 steel via controlling gaseous hydrogen pre-charging condition has been analyzed. The gaseous hydrogen charging of the SA-723 steel was performed under a constant pressure of 20 MPa of gaseous H2 at 150oC and 300oC for 2 and 6h, and TDS, SSRT and Charpy tests were conducted to analyze the hydrogen embrittlement (HE) behavior of the SA-723 steel. Furthermore, prior to commencing the test, these specimens were coated with Zn to prevent hydrogen from diffusing out of a specimen during the tests. The TDS results showed that the 300oC-6h and 150oC-6h charged steels contain larger amounts of hydrogen than 300oC-2h and 150oC-2h charged steel. The SSRT and Charpy test results also showed the similar trends that the mechanical properties of the steels deteriorate as the amount of hydrogen charged in the steel increases. Therefore, this study suggests that, for SA-723 steel, the charging time parameter is more effective to charge more amount of hydrogen into SA-723 steel, rather than the charging temperature.

노년층의 ‘스마트폰’ 이용 양상에 대한 연구: 70대 이상 여성을 중심으로

이강진,이설희 한국노인복지학회 2018 노인복지연구 Vol.73 No.2

This study aims to examine the social and cultural implications by looking into the usage pattern and experience of ‘Smartphone’ from women over 70 years old. In-depth interviews with 10 women over the age of 70 were conducted in order to take a closer look at their lives. As a result, four usage patterns of smartphone were identified. They were enjoying their cultural and aesthetic tastes using the smartphone that they didn’t enough in their journey of life, and there appeared the usage pattern of consideration for others as well as empathy rather than being self-centered. In addition, they reaffirmed themselves as a social being by using the new media such as smartphone and taking part in public discourse in the communication space such as Kakao Talk. Although this kind of experience increased their satisfaction of using the smartphone, it was with ‘excessive’ fear that they used their smartphones as influenced by negative discourse of the elderly and the conventional way of thinking. 이 연구는 70대 이상 여성의 ‘스마트폰’ 이용의 양상과 이용 경험을 통해 이 결과의 사회․문화적 의미가 무엇인지를 살펴보는 것을 목적으로 한다. 이들의 삶을 구체적이고 면밀하게 살펴보기 위해 70대 이상의 10명의 여성과의 심층 인터뷰를 실시했다. 그 결과 이들의스마트폰 이용 양상은 네 가지로 분석되었다. 이들은 고단한 삶의 여정에서 충분히 만끽하지 못했던 문화적이고 미적인 취향을 스마트폰으로 향유하고 있었고, 자기중심이기 보다는타인을 좀 더 배려하고 서로 공감하는 이용의 양상을 드러냈다. 또한 이들은 스마트폰과 같은 뉴미디어의 이용과 카카오톡과 같은 소통 공간에서의 공적 담론에의 참여를 통해 사회적존재로서의 자신의 모습을 재확인하고 있었다. 이러한 이용은 스마트폰 이용에 대한 만족도를 크게 높이고 있는데도 불구하고, 부정적인 노인에 대한 담론, 그리고 관습적인 사고의 패턴에 영향을 받으면서 ‘과도한’ 두려움을 지닌 채, 스마트폰을 이용하고 있었다.

신자유주의 한국 사회에서 예술 경험 회복을 위한 탐구

이강진,허준 한국영상학회 2015 한국영상학회 논문집 Vol.13 No.2

예술인들의 생존권을 보장하고자 하는 취지에서 제시된 예술인 복지법이 시행된 지 2년이 지난 현재의 시점에서도 여전히 많은 논쟁과 쟁점을 시사하고 있다. 이러한 사회적 현상에서 연구자들은 법의 제정과 시행에 있어 예술가와 예술, 그리고 그들의 노동에 대한 명료한 정의가 여전히 내려지지 않아 오히려 예술인들의 사회적 존재 가치를 더욱 희석시키고 있음을 지적하고자 한다. 이러한 비판적 관점에서 본 연구는 예술이 가지고 있는 사회적 함의를 재조명 하고자 경험으로서의 예술이 지닌 가능성을 탐색해보고, 더 나아가 이러한 경험들의 상호작용을 통해 예술이 획득할 수 있는 공공성에 대한 개념화에 대한 시도들을 살펴보고자 한다. 경험의 확장을 통한 예술의 소통 매개 질로서의 가능성은 궁극적으로는 예술가들의 사회적 존재 가치의 고양을 도모할 수 있는 시각을 제공한다. 더 나아가, 이러한 예술가들의 존재 가능성에 대한 사유는 현재의 예술인 복지법이 근본적으로 내재화한 “해결해야 되는 문제로서의 예술가들" 또는, “삶이 불우한 예술가들"이라는 단선적인 사고를 타파할 수 있는 대안을 제시할 수 있을 것이다. 보호 받아야만 하는, 취약하고, 불완전한 존재로서의 예술가들이 아니라 그들이 창조하는 예술 경험에 대한 보다 적확한 이해를 통해 그들의 노동이 보상되고 또 그들의 존재적 가치가 사회적으로 보장되기를 희망하며 연구자들은 예술가들의 위치를 다시금 파악하고자 한다. Within the artists’ social welfare problematique, at least in the case of modern Korea, Korean government and its specialists pertinent to such issue has not clearly defined who the ‘artists’ are, and what their artistic ‘creation’ is. Loosely put, the recent implementation of the Artist Social Welfare Laws has fueled arduous debates on who should be given what, and what needs to be provided to whom; thence, the question of why we need to stay alert in supporting art and artists to survive and thrive, still remains as a social, cultural, and economic conundrum. This study attempts to critically examine such futile yet fervid approaches throughout the legislative implementation of Artist Social Welfare Laws have been taken, whilst taking an angle of reconceptualizing art as experience that expands the horizon of communication and animates publicness of art, which has been long considered as a very personal and individual act of aesthetic expression. Therefore, such value that art holds, and artists produce throughout the “art experience,” comes forth as a vital agency. Albeit, this agency disproves the superficial evaluation and definitions of artist and creators, that were once under the economic propaganda of creative industry with neoliberal sensibility and standards. With hope that art and its value to be perpetually challenged, recontextualized, and revitalized, this study’s purpose is to locate the artists in our modern society with extended understanding, and to provide an alternative to how they should be supported without unnecessary conflicts rooted in the socially misconstrued perception of “artists in demise for the sake of art.”

Cultural Imperialism - How useful is the concept of cultural imperialism in understanding contemporary global flows of communication? -

이강진,정혜욱 한국영상학회 2013 한국영상학회 논문집 Vol.11 No.2

This study will objectively examine both discursive and pragmatic aspects of cultural imperialism in the context of globalization. First, commercially driven American media industries within market-oriented media policies and its’ influence on current media policies of other nations such as Europe and Asian societies need to be discussed. Also, the conglomerate media industries will be presented as a source of current trend of the world media market. In order to study relationship between cultural imperialism and current media flows, the development of non-western media industries are need to be analyzed in terms of their economic growths and media policies. As the main resource of the framework for this essay, Annabelle Sreberny-Mohammadi’s The Global and the Local in International Communications will be studied to present the rise of Third-world media industries and strong dominance of American media. For the dynamics of globalization and current flows of media policies and industries, Kalyani Chadha and Anandam Kavoori’s Beyond the global/local; Examining contemporary media globalization trends across national contexts, will be used as a major resource.

근적외선을 이용한 사과의 당도예측 (I) - 다중회귀모델 -

이강진,노상하,W. R. Hruschka,J. A. Abbott,B. S. Park 한국농업기계학회 1998 바이오시스템공학 Vol.23 No.6

The MLR(Multiple Linear Regression) models to estimate soluble solids content non-destructively were presented to make a selection of optimal photosensor utilized to measure the soluble solids content of apples. Visible and NIR absorbance in the 400 to 2498 nanometer(nm) wavelength region, soluble solids content(sugar content), hardness, and weight were measured for 400 apples(gala). Spectrophotometer with fiber optic probe was utilized for spectrum measurement and digital refractometer was used for soluble solids content. Correlation between absorbance spectrum and soluble solids content was analyzed to pick out the optimal wavelengths and to develop corresponding prediction model by means of MLR. For the coefficient of determination($R^2$) to be over 0.92, the MLR models out of the original absorbance were built based on 7 wavelengths of 992, 904, 1096, 1032, 880, 824, 1048nm, and the ones of the second derivative absorbance based on 5 wavelengths of 784, 1056, 992, 808, 872nm. The best model of the second derivative absorbance spectrum had $R^2$=0.91, bias= -0.02bx, SEP=0.28bx for unknown samples.

기준 밀도계의 측정 오차 분석에 관한 연구

이강진,허재영,하영철,안승희,이승준,이철구 한국화학공학회 2002 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.40 No.6

기준 밀도계는 기준 조건하에서 밀도를 측정하는 기기로서, 산업계에서 특히 대유량 천연가스 계량에 폭 넓게 사용된다. 본 연구에서는 기준 밀도계의 적정 설치 및 운영방안을 제시하여 천연가스 유량 측정 정확도를 향상시키고자 현장 실험을 수행하였다. 실험 결과, 교정가스로 메탄과 질소가스 대신 메탄과 표준가스로 교정한 실험결과가 작은 밀도오차를 발생하고, 정확한 밀도 측정을 위해서는 정기적인 교정이 필수적이며, 또한 기준 밀도계는 주위 조건에 민감하게 반응하여, 주위 온도가 높으면 오차가 증가하는 것도 확인되었다. The specific gravity meter is the instrument used to measure the density of fluids under the reference conditions and it can be widely used in industrial areas, especially in massive flow rate natural gas industry. This study has been carried out in an attempt to improve measurement accuracy of natural gas flow rate calculation, providing the adequate installation and proper operation conditions of specific gravity meter. The test results are 1) the density measurement errors in case of using methane and standard gas as calibration gases are smaller than using methane and nitrogen gas, 2) the periodical calibration to maintain accurate density measurements is essential, and 3) the specific gravity meter is sensitive to changes of environmental conditions, expecially environmental temperature surrounding the specific gravity meter.

Titanium Phosphide 표면에 대한 세포독성 및 골친화성의 평가

이강진,김천석,김형수,염창엽,김병옥,한경윤,Lee, Kang-Jin,Kim, Chun-Seok,Kim, Hyung-Soo,Yum, Chang-Yup,Kim, Byung-Ock,Han, Kyung-Yoon 대한치주과학회 1997 Journal of Periodontal & Implant Science Vol.27 No.2

Dental implants have been developed for enhancement of osseointegration. Biocompatibility, bone affinity and surface characteristics of dental implants are very important factors for osseointegration. The aim of the present study was to determine the cytotoxicity and the bone affinity of titanium phosphide(Ti-P) implant material. The Ti-P surface was obtained by vacuum sintering of titanium within compacted hydroxyapatite powder. The composition and the chemical change of the surface were determined by Auger electron spectroscopy. The in vitro cytotoxicity was evaluated by the viability of the bone cells and macrophages obtained from chicken embryo and rat,s peritonium, respectively. For the comparative evaluation, 316L stainless steel, commercially pure titanium and Ti-P materials, prepared in size of 1O.0mm in diameter and 5.0mm in height, were immersed separately in bone cells and macrophages for 10 days. For the evaluation of the in vivo bone affinity, 316L stainless steel, commercially pure titanium and Ti-P materials, prepared in size of 5.0mm in diameter and 10.0mm in length, were implanted after drilling in diameter 5.5mm in femurs of 2 dogs weighing 10Kg more or less. Six weeks after implantation the specimens were prepared for histopathological examination and were observed under light microscope. In comparison of in vitro bone cell viability, Ti-P and commercially pure titanium groups were not significantly different from control group (p>O.1), but 316L stainless steel group was significantly lower than control group(p<0.05). There was no statistical difference in the viability of macrophages between 3 different groups and control group(p>O.l). In comparison of in vivo study, 316L stainless steel and commercially pure titanium showed fibrous encapsulation, but Ti-P showed remarkable new bone formation without any fibrous tissue. The results demonstrate that Ti-P has favorable biocompatibility and bone affinity, and suggest that dental implants with Ti-P surface may enhance osseointegration.

프로씨름選手들의 技術使用에 關한 調査分析

李康鎭 慶北專門大學 (영주경상전문대학) 1986 慶北專門大學 論文集 Vol.6 No.-

북동아시아 여름철 강수의 월별 특성 분석과 예측성 검증

이강진,권민호,임소영 한국기상학회 2015 한국기상학회 학술대회 논문집 Vol.2015 No.10

Solar Flare Occurrence Rate and Probability in Terms of the Sunspot Classification Supplemented with Sunspot Area and Its Changes

이강진,문용재,이진이,이경선,나현옥,김해연,신대윤,Lee, Kangjin,Moon, Yong-Jae,Lee, Jin-Yi,Lee, Kyoung-Sun,Na, Hyeonock,Kim, Haeyeon,Shin, Dae-Yun 한국천문학회 2012 天文學會報 Vol.37 No.2

We investigate the solar flare occurrence rate and daily flare probability in terms of the sunspot classification supplemented with sunspot area and its changes. For this we use the NOAA active region data and GOES solar flare data for 15 years (from January 1996 to December 2010). We consider the most flare-productive eleven sunspot classes in the McIntosh sunspot group classification. Sunspot area and its changes can be a proxy of magnetic flux and its emergence/cancellation, respectively. We classify each sunspot group into two sub-groups by its area: "Large" and "Small". In addition, for each group, we classify it into three sub-groups according to sunspot area changes: "Decrease", "Steady", and "Increase". As a result, in the case of compact groups, their flare occurrence rates and daily flare probabilities noticeably increase with sunspot group area. We also find that the flare occurrence rates and daily flare probabilities for the "Increase" sub-groups are noticeably higher than those for the other sub-groups. In case of the (M+X)-class flares in the 'Dkc' group, the flare occurrence rate of the "Increase" sub-group is three times higher than that of the "Steady" sub-group. Our results statistically demonstrate that magnetic flux and its emergence enhance the occurrence of major solar flares.