기계적으로 밀링된 나노결정 Al-14wt%Ni-14wt%Mm 합금 분말의 열 안정성과 미세조직

홍순직,이윤석,천병선 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.10

Mechanical milling has been performed for Al-14 wt%Ni-14 wt%Mm(Mm=misch metal) alloy powders rapidly solidified by the gas atomization method. The microstructure, hardness, and thermal stability of the powders were investigated as a function of milling time using X-ray diffraction(XRD), transmission electron microscopy(TEM), Vickers micro-hardness tester and differential scanning calorimetry(DSC) methods. In the early stage of milling, a cold-welded layer with a fine microstructure was formed along the edge of the milled powder (Zone A). The interior of the powder remained unworked (Zone B), resulting in a formation of two-zone microstructure. With increasing milling time, the nanocrystallite size decreased gradually reaching a size of about 10-15 nm and the lattice strain increased reaching a maximum value of about 0.7% after milling for 200 hours. The microhardness of the mechanically milled powder was 132 kg/㎟ after milling for 72 hours, and it increased to 290 kg/㎟ after milling for 200 hours because of the presence of fine nano structured phases.

침전법에 의한 알루미나 분말제조 IV.ZrO₂의 분산에 의한 Al₂O₃/ZrO₂ 복합체의 제조 및 기계적 특성

홍기곤,이홍림,이형직,이호순 연세대학교 산업기술연구소 1992 논문집 Vol.24 No.2

In this study, a precipitation method, one of the most effective liquid phase reaction, was adopted in order to prepare high-tech Al₂O₃/ZrO₂ composite ceramics. Al₂(SO₄)₃·18H₂O, ZrOCl₂·8H₂O and YCl₃·6H₂O were used as starting materials and NH₄OH as a precipitation agent. Fine powders were prepared at optimum calcination condition. Sinterability of each fine powder and the effects of ZrO₂ on the grain size and mechanical properties of Al₂O₃ were investigated. The composition of Al₂O₃/ZrO₂ composites was fixed as Al₂O₃-15v/o ZrO₂(+3m/o Y₂O₃). The effect of MgO on the grain size of Al₂O₃ZrO₂ ceramics was also investigated.

Recycling of the indium scrap from ITO sputtering waste

Hong, Hyun Seon,Jung, Hangchul,Hong, Soon-Jik Springer-Verlag 2010 Research on chemical intermediates Vol.36 No.6

Etching Effect on Microstructural Behavior of Gas Atomized Al-20 mass%Si Alloy Powder

The Japan Institute of Metals 2010 MATERIALS TRANSACTIONS Vol.51 No.5

<P>In this research, a metallographic investigation of as atomized Al-20 mass%Si alloy powders, etched at surface and cross-section, was conducted by scanning electron microscopy. The surface micrographs of the etched powders showed the existence of primary Si and eutectic Si on the microstructure of the powder surface, and satellite particles adhering to the larger particles, while it was impossible to observe the surface microstructure in the case of the non-etched powder surface. The coarse primary Si phases in these powder particles were not present, indicating that their formation was effectively suppressed by the rapid solidification. In addition, it was possible to observe the microstructure of satellite powder surface such as fine cellular or featureless structure due to surface etching.</P>

Glutamate, GABA, 5-HT의 이온영동적 주입이 동통과 관련된 시상 뉴론의 단위 활동에 미치는 효과

이순직,이배환,홍승길 고려대학교 의과대학 1988 고려대 의대 잡지 Vol.25 No.3

This experiment was conducted to determine what neurotransmitters are involved in ascending pain modulation mechanism from periaqueductal gray (PAG) to parafascicular nucleus (PF) of the thalamus by observing the response patterns of PF neurons to iontophoretically released drugs. For this, after the spontaneous activity of PF neurons and the evoked potentials to the noxious stimulus were recorded, the responses of neurons were observed while ejecting glutamate, gamma-aminobutyric acid (GABA), and 5-hydroxytryptamine (5-HT) iontophoretically. And the responses of neurons to electrical stimulation of the PAG were recorded. Results are as follows: 1. PF neurons which showed responses to the noxious stimulus were identified. 2. The activity of PF neurons was increased by iontophoretic application of glutamate but decreased by GABA. 3. The ejection of 5-HT tended to decrease the activity of PF neurons. 4. PAG stimulation by and large inhibited the increase in firing rate caused by the noxious stimulus. 5. The effects of glutamate and GABA on PF units were independent of the effect of PAG stimulation. 6. The effect of 5-HT of PF units was related to the inhibitory effect of PAG stimulation. The results may be interpreted to indicate that neurons mediating 5-HT but not glutamate and GABA are related to ascending pain modulation system from PAG to PF.

임금노동자의 직무만족도에 영향을 미치는 요인에 관한 연구: 인구사회학적요인, 성격특성요인, 조직요인을 중심으로

이홍직(Hong Jik Lee),윤수인(Su In Yoon),최순례(Soon Lye Choi),윤승태(Seung Tae Yoon) 서강대학교 생명문화연구소 2019 생명연구 Vol.52 No.-

This study aims to examine the factors affecting job satisfaction of wage workers. For this purpose, theories and preceding studies on job satisfaction and Big 5 personality factors were reviewed and the effects of sociodemographic factors, personality trait factors, and organizational factors were analyzed. From the 18 and 19th Korean Labor and Income Panel Study data, 5,784 wage workers were extracted for the analysis, and frequency analysis, correlation analysis and multiple regression analysis were conducted. As a result, the openness, conscientiousness, and agreeableness of the personality factors showed positive influence on job satisfaction, while neuroticism showed negative influence. In addition, it was analyzed that gender, age, education, employment position, monthly average wage, incentive pay, weekly regular working hours, and the fitness level of education and skill have significant influence on job satisfaction. Therefore, this study suggested introducing programs to enhance openness and alleviate neuroticism in organizations. It also proposed policy measures to improve job satisfaction such as reducing working hours, switching to permanent position, and providing quality jobs. 본 연구의 목적은 임금노동자를 대상으로 직무만족에 영향을 미치는 요인들을 고찰하고 그 영향력을 분석하는 것이다. 이를 위해 직무만족과 Big 5 성격요인을 중심으로 이론과 선행연구를 고찰하고 인구사회학적요인, 성격특성요인, 조직요인으로 변수를 구성하여 한국노동패널조사 18차 부가조사와 19차 본조사에 응답한 임금노동자 5,784명을 대상으로 기술통계분석, 상관관계분석, 다중회귀분석을 시행하였다. 분석 결과, 성격요인 Big 5 중 개방성, 성실성, 친화성은 직무만족도에 정적인(+) 영향력을 신경증은 부적인(-) 영향력을 나타냈다. 이와 함께 조직요인의 정규직 여부, 월평균임금, 성과급제 여부, 교육수준적합도와 기술수준적합도는 정적인 영향을, 근로시간은 부적인 영향을 미치는 것으로 분석되었다. 인구사회학적요인에서는 여성일수록, 학력과 연령이 높을수록 직무만족도가 높은 것으로 나타났다. 이에 본 연구는 개방성 함양과 신경증 완화를 위한 프로그램 개발, 근로시간 단축, 정규직 전환, 고용의 질 재고 등 직무만족도를 향상시킬 수 있는 실천적, 정책적 방안을 제시하였다.

여성결혼이민자의 한국국적 인식 유형에 관한 연구 : Q 방법론적 접근

최순례(Choi, Soon-Lye),이홍직(Lee, Hong-Jik) 한국통합사례관리학회 2021 한국케어매니지먼트연구 Vol.- No.39

본 연구는 자녀를 둔 여성결혼이민자의 한국국적에 관한 인식 유형을 탐색하고, 그 유형별 특성을 규명하기 위해 Q 방법론을 통해 수행되었다. 이를 위해 본 연구는 2018년 9월부터 2019년 11월까지 다문화지원센터와 지역사회복지관의 프로그램에 참여하고, 자녀가 있는 여성 결혼이민자를 대상으로 한 심층 면접 자료와 OECD의 ‘사회통합지표’, 그리고 다문화·다양성 측정지표체계의 국적 관련 부분 등을 참조하여 31개의 Q 표본을 선정하였다. 또한, 본 연구는 서울, 경기 지역의 다문화가족지원센터 및 지역사회복지관을 거점으로 자녀를 둔 여성결혼이민자 20명을 P 표본으로 채택하였다. 분석 결과, 여성결혼이민자의 한국국적에 관한 인식유형은 ‘가족과 일 양립의 한국국적 선호형’, ‘출신국을 염두에 둔 한국국적 보류형’, ‘실리추구를 통한 한국국적 선택형’의 세 유형으로 분류되었다. 본 연구는 각 유형별 특성을 확인하고, 각 유형별 특성을 고려한 정책적, 행정적, 실천적 함의를 전달하였다. This study explored the different perceptions regarding the Korean citizenship of female marriage immigrants in Korea and investigated the characteristics of each type through Q methodology. For the purpose of study, 31 Q samples were derived from interviews with female marriage immigrants who participated in programs of muticultural support centers and community service agencies and literature reviews on cultural diversity, whereas 20 P samples were selected from female marriage immigrants who attended community-based multicultural family support centers in Seoul and Gyeonggi province. As a result of study, three types were distinguished: First (1) the preference for the Korean citizenship in order to balance between family and work, second (2) the desire to obtain the Korean citizenship but simultaneously maintain values their mother land had to offer and lastly (3) the selection of Korean citizenship for practical profit. Based on the findings, policy and practical implications for better services are suggested, considering their perceptions of Korean citizenship.

단독주택의 에너지효율 등급설정 및 인증기준(안) 연구

장용성,홍성희,박효순,서승직 대한건축학회 2004 대한건축학회논문집 Vol.20 No.12

This study aimed to make out certification criterion and establishment of the energy efficiency rating of a detached house To this end, we surveyed the energy consumption and plan type of a existing detached house And we also set a reference house throughout a investigation data and developed simple energy analysis software program for a energy performance evaluation of a detached house A energy efficiency rating of a detached house was established by a comparison and analysis of heating energy simulation result according to variation of the U-value of a window and construction, ratio of a window area, setting temperature of a room and air change of rate

Hydrothermal method for the synthesis of sb2te3, and bi0.5sb1.5te3 nanoplates and their thermoelectric properties

Dharmaiah, Peyala,Hong, Soon‐,Jik Wiley-Blackwell 2018 International journal of applied ceramic technolog Vol.15 No.1

노인의 심리적 안녕감 결정요인에 관한 연구

손덕순(Duk Soon Son),이홍직(Hong Jik Lee) 한국노인복지학회 2006 노인복지연구 Vol.0 No.31