Atomic Layer Deposition으로 증착된 Al-doped ZnO Film의 전기적, 구조적 및 광학적 특성 분석

임정수,정광석,신홍식,윤호진,양승동,김유미,이희덕,이가원,Lim, Jung-Soo,Jeong, Kwang-Seok,Shin, Hong-Sik,Yun, Ho-Jin,Yang, Seung-Dong,Kim, Yu-Mi,Lee, Hi-Deok,Lee, Ga-Won 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.6

Al-doped ZnO film on glass substrate is deposited by ALD in low temperature, using 4-step process (DEZ-$H_2O$-TMA-$H_2O$). To find out the optimal film condition for TCO material, we fabricate Al-doped ZnO films by increasing Al doping concentration at $100^{\circ}C$, so that the Al-doped film of 5 at% shows the lowest resistivity ($1.057{\times}10^{-2}{\Omega}{\cdot}cm$) and the largest grain size (38.047 nm). Afterwards, the electrical and physical characteristics in Al-doped films of 5 at% are also compared in accordance with increasing deposition temperature. All the films show the optical transmittance over 80% and the film deposited at $250^{\circ}C$ demonstrates the superior resistivity ($1.237{\times}10^{-4}{\Omega}{\cdot}cm$).

SVM 기반 음성/음악 분류기의 효율적인 임베디드 시스템 구현

임정수,장준혁,Lim, Chung-Soo,Chang, Joon-Hyuk 한국음향학회 2011 韓國音響學會誌 Vol.30 No.8

제한된 대역폭을 효율적으로 사용하기 위해서 도입된 가변 전송률은 먼저 신호의 정확한 분류를 필요로 한다. 특히 멀티미디어 서비스가 보편화 되면서 음성/음악 신호 분류의 중요성도 높아지게 되었다. 음성/음악 분류기 중, 서포트벡터머신 (SVM)을 이용한 분류기는 높은 분류 정확도로 주목받고 있다. 그러나 SVM는 많은 계산량과 저장 공간을 요구하므로 효율적인 구현이 요구되며, 특히 임베디드 시스템과 같이 자원이 제한 적인 경우에는 더욱 그러하다. 본 논문에서는 먼저 SVM을 이용한 음성/음악 분류기의 임베디드 시스템으로의 구현을 실행시간과 에너지소비의 관점에서 분석하고, 효율적인 구현을 위한 두가지 방법들을 제안한다. 서포트벡터의 판별결과에의 기여도를 바탕으로 기여도가 낮은 벡터들을 제외하는 방법과, 음성/음악 신호에 기본적으로 존재하는 각 프레임간의 상관관계를 이용하여 입력신호의 일부를 건너뛰는 방법이다. 이 기법들은 SVM의 학습 시 사용되는 다른 최적화 기법에 관계없이 적용이 가능하며, 실험을 통해 분류의 정확도, 실행시간, 그리고 에너지소비의 관점에서 그 성능을 증명하였다. Accurate classification of input signals is the key prerequisite for variable bit-rate coding, which has been introduced in order to effectively utilize limited communication bandwidth. Especially, recent surge of multimedia services elevate the importance of speech/music classification. Among many speech/music classifier, the ones based on support vector machine (SVM) have a strong selling point, high classification accuracy, but their computational complexity and memory requirement hinder their way into actual implementations. Therefore, techniques that reduce the computational complexity and the memory requirement is inevitable, particularly for embedded systems. We first analyze implementation of an SVM-based classifier on embedded systems in terms of execution time and energy consumption, and then propose two techniques that alleviate the implementation requirements: One is a technique that removes support vectors that have insignificant contribution to the final classification, and the other is to skip processing some of input signals by virtue of strong correlations in speech/music frames. These are post-processing techniques that can work with any other optimization techniques applied during the training phase of SVM. With experiments, we validate the proposed algorithms from the perspectives of classification accuracy, execution time, and energy consumption.

만성 염증시 치주 결체조직 세포 성장 및 총 단백질 변화에 관한 연구

임정수,오귀옥,김형섭,Lim, Jeong-Su,Oh, Kwi-Ok,Kim, Hyung-Sup 대한치주과학회 1993 Journal of Periodontal & Implant Science Vol.23 No.1

The investigation was undertaken to determin the altered function and structure of granulation tissue fibroblasts. Human granulation-tissue fibroblasts were cultured from periodontal chronic inflammatory lesions (SBI index : above 3) and compared with healthy gingival connective tissues fibroblasts a control(SBI index : below 1). Granulation tissue fibroblasts proliferated with a slower growth rate and exhibited larger cell size than control cells. Total protein profile of granulation tissue fibroblasts was almost identical to that of control cells with some exception. These results support tha theory that granulation tissue fibroblasts represent a distinct phenotype of fibrotic cells.

액비화 과정 중 인 이용 우수미생물 분리 및 특성

임정수,조성백,황옥화,양승학,Lim, Joung-Soo,Cho, Sung-Back,Hwang, Ok-Hwa,Yang, Seung-Hak 한국축산환경학회 2014 한국축산시설환경학회지 Vol.20 No.2

This study was conducted to investigate the bacterial capability to accumulate phosphorus during liquid composting process of pig slurry. Storage liquid compost and pig slurry were analyzed by using MALDI-TOF technique, which showed the colonies of Acinetobacter towneri and Bacillus licheniformis. In addition, bacterial colonies were isolated under high phosphoric acid conditions using X-phosphate MOPS medium with the addition of 2 mM $K_2HPO_4$. Microbial growth was observed in high and low phosphoric conditions due to the growth of bacterial diversities in the liquid fertilizer and slurry. The colonies isolated in the high phosphoric acid medium were uncultured bacterium clone and Acinetobacter sp. were identified by analysis of 16S rRNA gene sequences. Uncultured bacterium showed higher growth rate and excellent phosphorus ability then Acinetobacter sp.. In addition to Paenibacillus sp. AEY-1 isolated from pig slurry performed excellent phosphorus utilizing capability.

Biomedia를 충전한 Biofilter에서 H₂S와 NH₃ 혼합악취의 제거

임정수,조욱상,이은영,Lim, Joung Soo,Cho, Wook Sang,Lee, Eun Young 한국청정기술학회 2006 청정기술 Vol.12 No.3

Polyurethane, PVA(polyvinyl alcohol)와 지렁이 분변토로 제작한 biomedia를 충진한 바이오필터(biofilter)를 이용하여 $H_2S$와 $NH_3$의 혼합 악취를 제거하였다. $NH_3$ 농도를 50 ppmv로 고정시킨 후, $H_2S$의 농도는 1~489 ppmv까지 증가시키며 제거효율을 살펴보았다. 또한 $NH_3$의 농도를 점진적으로 증가시켜 80, 100, 200, 300, 400, 500 ppmv 으로 설정하여 각각의 $NH_3$농도가 고정된 조건에서는 $H_2S$를 점차적으로 농도를 증가시켜주며 $NH_3$ 및 $H_2S$ 가스의 제거효율을 알아보았다. 혼합 악취가 공급되는 조건에서 $NH_3$의 유입 부하량은 입구농도가 50~300 ppmv 까지는 부하량 $11.14g\;N{\cdot}m^{-3}{\cdot}h^{-1}$이 증가함에 따라 제거용량도 비례하여 증가하였다. 입구농도가 300 ppmv 이상으로 증가함에 따라 유입 부하량은 증가하는 반면, 제거효율과 제거용량은 감소되는 것을 볼 수 있었다. 복합악취가 공급되는 조건에서 $H_2S$ 최대 부하량은 $40.27g\;S{\cdot}m^{-3}{\cdot}h^{-1}$이하이며, $NH_3$ 부하량이 $15.25g\;N{\cdot}m^{-3}{\cdot}h^{-1}$ 이하인 조건에서는 $NH_3$의 공급에 의해 $H_2S$의 제거효율은 큰 영향을 받지 않는 것으로 나타났다. When ammonia ($NH_3$) and hydrogen sulfide ($H_2S$) in binary mixture gases were supplied to a biofilter packed with biomedia made of polyurethane, PVA, and worm cast. No odor gases were detected on the outlet of the biofilter when $NH_3$ and $H_2S$ were separately supplied to the biofilter at space velocity(SV) of $50h^{-1}$ until inlet $NH_3$ concentration was increased up to 300 ppmv and inlet $H_2S$ to 428 ppmv. While, inlet $NH_3$ concentration maintained at 50 ppmv, inlet $H_2S$ concentration increased from 1 to 489 ppmv, and the removal efficiency of each gas was investigated. After that, $NH_3$ concentration increased step by step such as 80, 100, 200, 300, 400 and 500 ppmv. $H_2S$ concentration increased gradually when $NH_3$ concentration was set up at each condition. Under each condition, removal efficiency of $NH_3$ and $H_2S$ gas was investigated by analysing the gases sampled from the inlet and outlet of the biofilter. When binary gases were supplied to the biofilter and inlet $NH_3$ concentration was increased from 50 to 300 ppmv, elimination capacity of $NH_3$ increase linearly as inlet loading increased to $11.14g\;N{\cdot}m^{-3}{\cdot}h^{-1}$. However, as inlet $NH_3$ concentration increased over 300 ppmv, both removal efficiency and elimination capacity decreased while inlet loading increased. $H_2S$ removal efficiency was not affected seriously by the simultaneous supply of $NH_3$ when maximum inlet loading of $H_2S$ was under $40.27S{\cdot}m^{-3}{\cdot}h^{-1}$ and maximum inlet loading of $NH_3$ was under $15.25N{\cdot}m^{-3}{\cdot}h^{-1}$.

Vitek 2 Compact System을 이용한 Bacillus licheniformis의 동정 및 NH₃ 저감효과

임정수,한덕우,이상룡,황옥화,곽정훈,조성백,Lim, Joung-Soo,Han, Deug-Woo,Lee, Sang-Ryong,Hwang, Ok-Hwa,Kwag, Jung-Hoon,Cho, Sung-Back 한국축산환경학회 2015 한국축산시설환경학회지 Vol.21 No.3

An attempt to produce more pigs in limited spaces inevitably generalized concentrated feeding operation (CFO). As concentrated pig production practice expanded, concerns on environmental issues grow concurrently. Since odor is the concerned most among those, we attempted to develop means to tackle odor emission from livestock operations. Previously, we excavated few microorganisms from pig manure and, one of them, Bacillus licheniformis was particularly useful to handle odor problem. In this study, we conducted our investigation to further characterize Bacillus licheniformis. Strain identification was conducted using Vitek 2 compact, and the optimal temperature and pH conditions to growth B. licheniformis were searched for by analyzing turbidity on O.D 600 nm. Results of this study can be summarized as these, (1) it was re-verified that the bacterial strain that purified from pig manure was, in fact, Bacillus licheniformis, (2) the bacterial growth was highest when the temperature was kept at $30^{\circ}C$, also (3) growth rate was dependent on media pH as it was high at neutral (6, 7 and 8) but dropped when it was diverged from neutral (4, 5, 9 and 10), and (4) regarding ammonia removal efficiency, B. licheniformis recorded 64% effectiveness after 48 h incubation and reached its highest (80%) at 72 h.

유한요소법을 이용한 마이크로 평엔드밀링에서의 공구변형 예측

임정수,조희주,서태일,Lim, Jeong-Su,Cho, Hee-Ju,Seo, Tae-Il 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6

The main purpose of this study strongly concerned micro machining error estimation by using FEM analysis of tool deflection shapes in micro flat end-milling process. For the precision micro flat end-milling process, analysis of micro cutting errors is mandatory. In general, tool deflection is a major factor which causes cutting error and limits realization of the high-precision cutting process. Especially, in micro end-milling process, micro tool deflection generates very serious problems in contrast to macro tool deflection. Methods which deal with compensation of cutting error by tool deflection in macro end-milling process have been studied plentifully but, few researches transact with micro scaled cutting tool deflection in micro cutting process. Therefore, the trend of micro tool deflection was estimated by using FEM analysis in this paper. Cutting forces were acquired by micro dynamometer and these were utilized in FEM analysis. In order to verify FEM analysis results, micro machining processes were carried out and real machined profiles were compared with FEM results. Finally through the proposed approach well suited FEM results were obtained.

20대 여성의 BMI와 체지방률에 따른 심혈관기능, 정신건강 척도 및 스트레스관련 변인의 비교 분석

임정수 ( Jung Su Lim ),김예영 ( Yae Young Kim ),이만균 ( Man Gyoon Lee ) 한국스포츠정책과학원(구 한국스포츠개발원) 2016 체육과학연구 Vol.27 No.1

마른 비만(normal weight obesity)은 체중과 체질량지수(body mass index: BMI)는 정상 범위에 해당하지만, 제지방량이 부족하고 체지방률이 높은 신체균형 불균형 상태로서, 일반 비만과 유사한 대사적 이상상태를 보이는 경우가 많다. 현대사회에서 외모와 날씬한 몸매에 대한 지나친 관심에 따라 운동 부족과 불균형적인 식이 섭취에 기인하여 주로 20대 여성에게서 마른 비만이 주로 나타난다. 이들 마른 비만자의 심혈관기능과 정신건강 상태를 분석한 연구가 매우 부족한 실정이다. 이 연구에서는 20대 여성의 BMI와 체지방률에 따른 심혈관기능, 정신건강 척도 및 스트레스관련 변인을 비교·분석하였다. 20대 여성 68명을 대상으로 BMI와 체지방률에 따라 정상 집단(n=25), 마른비만 집단(n=19), 그리고 일반비만 집단(n=24)의 세 집단을 구성 하였으며, 각 집단 간에 심혈관기능, 정신건강 척도 및 스트레스관련 혈액변인의 차이를 분석하였다. 이 연구 에서 얻은 결과는 다음과 같다. 1) 심혈관기능과 관련된 변인에서는 혈압, 평균동맥압, 심근 산소소비량에서 정상 집단과 일반비만 집단 간에 유의한 차이가 나타났다. 2) 우울 척도와 스트레스 자각 척도에서는 세 집단간에 유의한 차이가 나타나지 않았으나, 일반비만 집단에서 가장 높은 점수를 보였다. 3) 인슐린, 글루코스, 그리고 CRP에서는 정상 집단과 일반비만 집단 간, 그리고 마른비만 집단과 일반비만 집단 간에 유의한 차이가 나타났고, 일반비만 집단에서 가장 높은 수치를 보였다. 이 연구에서 얻은 결과를 종합해보면, 대상자들의 연령이 20대 여성임에도 불구하고 정상 집단과 일반비만 집단 간에 심혈관기능의 차이가 있었으며, 스트레스 관련 혈액변인에서도 비만 집단의 상태가 정상 집단과 마른비만 집단에 비해 좋지 않은 것으로 관찰되었다. 비록, 이 연구에서 마른비만 집단의 신체적·정신적 건강 수준이 비만 집단만큼 위험한 것으로 나타나지는 않았으나, 비만할수록 전반적인 건강상의 위험도가 증가하는 경향을 나타냈다. 여성의 경우 연령의 증가에 따라 호르몬의 급격한 변화와 더불어 체지방률의 증가 및 정신건강의 문제가 발생할 수 있으므로 20대부터 규칙적인 운동과 균형잡힌 식이 섭취를 실천하여 향후 발생할 다양한 건강 문제를 예방하는 것이 중요할 것이다. The primary purpose of the study was to compare cardiovascular function, mental health indices, stress-related variables according to body mass index (BMI) and percent body fat (%BF) in 20s females. Sixty-eight women, aged 20-29 yrs, participated in the study as subjects. There were three groups, i.e., normal group (BMI<24 kg·m-2 and %BF<25%; n=25), normal weight obese group (BMI<24 kg·m-2 and 28%<%BF<40%; n=19), and obese group (BMI>26 kg·m-2 and 28%<%BF<40%; n=24). Cardiovascular function, mental health indices, stress-related blood variables were measured and compared among three groups. Main results of the present study were as follows: 1) SBP, DBP, mean arterial pressure, and RPP were significantly higher in obese group than normal group. 2) There were no significant differences in mental health indices among three groups. 3) Fasting plasma insulin, fasting plasma glucose, and CRP were significantly higher in obese group than normal weight obese group and normal group. It was concluded that there would be abnormal cardiovascular function, insulin resistance, and inflammation in general obese individuals in 20s females, not normal weight obese and normal individuals.

결혼이주여성의 거주기간과 취업 간 관계에서 사회자본의 매개효과

임정수(Lim, JeongSu),최수찬(Choi, Soochan) 한국사회복지학회 2022 한국사회복지학 Vol.74 No.2

본 연구는 결혼이주여성의 사회자본을 교량적 및 결속적 사회자본으로 구분해 이들의 한국 거주기간이 사회자본을 매개로 취업에 미치는 영향을 확인하는 것을 목적으로 한다. 이를 위해 한국여성정책연구원에 의해 수행된 ‘2018년 전국 다문화가족 실태조사’를 활용하였고 만 19세부터 만 60세까지의, 한국인 배우자가 있는 결혼이주여성 중 만 8세 이하 자녀를 가진 6,517명을 대상으로 하였다. SPSS 24.0을 활용하여 다중 선형 및 로지스틱 회귀분석을 실시한 결과, 결혼이주여성의 거주기간과 교량적, 결속적 사회자본 모두 취업 가능성을 높이는 것으로 나타났다. 또한 거주기간이 길어질수록 교량적 사회자본은 유의미하게 높아지나, 결속적 사회자본에는 유의미한 영향이 나타나지 않았다. 따라서 결혼이주여성의 한국 거주기간과 취업 간 관계에서 교량적 사회자본의 매개효과가 검증되었다. 이와 같은 연구 결과를 바탕으로 결혼이주여성의 안정적인 경제활동 참여를 통한 한국사회 적응을 위한 실천적, 정책적 함의를 제시하였다. The purpose of this study is to examine the impact of marriage migrant women’s residence period in Korea on their employment and the mediating effects of their social capital by dividing it into bridging and bonding type. In order to accomplish this purpose, data of 6,517 married migrant women aged 19 to 60 who have Korean spouses and children under the age of 8 were examined. Multiple linear and logistic regression analyses were used to examine the mediation model by SPSS 24. The main results are as follows. First, the study indicated that the residence period was positively associated with the possibility of employment. Second, residence period had a positive relationship with the bridging social capital, but not with the bonding social capital. Third, it was found that both bridging and bonding social capital increased the employment rate. Lastly, the association between residence period and employment of marriage migrant women was mediated by their bridging social capital. Based on these results, this study suggested practical and political implications for social adaptation and participation in economic activities of marriage migrant women in Korea.

범용 절삭력 모델을 이용한 마이크로 엔드밀링의 절삭력 예측

임정수(J. S. Lim),서태일(T.I. Seo),우창기(C. G.Woo),민경탁(K. T. Min),조희주(H. J. Cho),이정원(J. W. Lee) 한국정밀공학회 2010 한국정밀공학회 학술발표대회 논문집 Vol.2010 No.5월