에너지 절약형 자동조명 장치 개발

최명호,강형곤,김민기,한병성 ( Myeong Ho Choi,Hyung Kon Kang,Min Ki Kim,Byung Sung Han ) 한국전기전자재료학회 1996 전기전자재료학회논문지 Vol.9 No.10

1980년대 학교교사에 대한 보, 기둥 및 접합부 사이의 파괴모드 분석

최명호,하세연,이창환,Choi, Myeong-Ho,Ha, Se-Yeon,Lee, Chang-Hwan 한국공간구조학회 2021 한국공간구조학회지 Vol.21 No.3

As earthquakes continue to occur in Korea in recent years, seismic evaluation and retrofit of existing school buildings have been carried out. Many domestic school buildings were built using or referring to standard drawings. Therefore, if the overall structural characteristics of a school building can be known first based on standard drawings, it can be provided as valuable data for detailed seismic evaluation. For this reason, this study investigated the weak structural components and failure modes by comparing the strength of beams, columns, and joints constituting standard school buildings constructed in the 1980s. The evaluation was performed for different types of standard drawings and different material strengths. The results showed that the joint was mainly the weakest due to the eccentricity, and the failure modes were partially changed depending on the material strength.

저온 소결제 첨가에 의한 LiNb₃O₈-TiO₂계 세라믹스의 마이크로파 유전 특성

최명호,김남철,Choi, Myung-Ho,Kim, Nam-Chul 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.6

The microwave dielectric properties of $LiNb_3O_8-TiO_2$ based ceramics with low firing agents, CuO, $Bi_2O_3$, $B_2O_3$, $SiO_2$, $TiO_2$, were investigated to improve the sintering condition for the LTCC system. According to the X-ray diffraction and SEM, the ceramics of $LiNb_3O_8-TiO_2$ with low firing agents showed no significant second phases within a range of experiments, and fine microstructures. By adding the low firing agents, the sintering temperature decreased from $1200^{\circ}C$ to $925^{\circ}C$. Based on the results of electrical measurements, the $LiNb_3O_8-TiO_2$ ceramics showed a promising microwave dielectric properties for LTCC applications, those are ${\varepsilon}_r$ (dielectric constant) = 44, Q f (quality factor) = 18000, and ${\tau}_f$ (the temperature coefficient of resonant frequency) = $-1.5\;ppm/^{\circ}C$.

CAQC교육에 있어서 컴퓨터 활용과 학습모델에 관한 연구 - 히스토그램을 중심으로 한 학습모델 -

최명호,Choi Myung-Ho 한국공학교육학회 2000 공학교육연구 Vol.3 No.2

The paper has analyzed and summarized about the theoretical problem occurred in the CAQC, and has developed the learning model focused on the histogram as a case study. The range of study is to systematize the basic method of histogram generally used, and to make step by step procedures under the interactive relation with the improvement of the theory that must be added in case of the calculation by the aided of MS-Excel software. A histogram is the theory to understand the population distribution from which samples are extracted, so alternative methods are presented to estimate the population shape through an experiment and a practice. In order to enlarge the application area of the histogram in the factory, the theory of normal test, the criteria of process capability index and the probability calculation of PPM are added to the histogram. The learning model of CAQC education is proposed that is consistent with the target of histogram to control and search the cause of item defectives fast and correctly. 본 연구는 컴퓨터 지원하의 품질경영(CAQC)교육에 있어서 발생되는 문제점을 분석하여 정리하고, 사례로서 히스토그램을 중심으로 한 학습모델을 개발하였다. 연구의 범위는 일반적으로 널리 통용되고 있는 히스토그램의 작성방법을 MS-엑셀을 활용하여 계산할 경우에 개선되어야할 문제점과 추가되어야 할 이론을 상호연관성 하에서 단계적으로 진행되도록 한 체계화이다. 히스토그램은 추출한 표본의 분포 형태로부터 모집단을 파악하자는 이론이므로 모집단의 분포의 형태를 추정해내기 위한 방법들을 실험과 실습을 통하여 대안을 제시했다. 히스토그램의 활용성을 확대시켜서 생산현장에서 응용할 수 있도록 정규성 검정에 관한 방법, 공정능력지수의 적용기준, PPM기법의 확률계산 등의 이론을 상호보완적으로 연관시켜 추가하였다. 불량원인을 신속하고 정확하게 찾아서 개선하고 관리하는 방법의 도구로서 히스토그램 본래의 목적에 잘 부합될 수 있도록 CAQC교육의 학습모델을 제안한다.

고온초전도 전류제한소자의 기초특성에 관한 연구

崔明鎬(Myong-Ho Choi),崔孝祥(Hyo-Sang Choi),韓秉誠(Byoung-Sung Han) 대한전기학회 1994 전기학회논문지 Vol.43 No.12

70W 매탈할라이드용 전자식 안정기의 설계

최명호(Myung Ho Choi),조병서(Byung Seo Cho),이남재(Nam Jae Lee),윤장완(Chang Wan Yun),한병성(Byung Sung Han) 전북대학교 공학연구원 (구 전북대학교 공업기술연구소) 1998 工學硏究 Vol.29 No.-

비내진상세를 가진 기존 RC 기둥의 반복거동 평가

최명호 ( Choi Myeong-ho ),김영찬 ( Kim Young-chan ),이창환 ( Lee Chang-hwan ) 한국건축시공학회 2022 한국건축시공학회 학술발표대회 논문집 Vol.22 No.1

The seismic performance of existing reinforced concrete (RC) elements to which seismic design was not applied is questionable. To evaluate the behavior of existing RC columns, column specimens with widely spaced transverse reinforcement and 90-degree hoop anchor hooks as variables were designed. Experimental tests were performed by applying a fixed low axial load and increasing lateral cyclic loads to the specimens. As a result, the hoop spacing and anchor hook angle did not significantly affect the load-displacement relationship and the dissipated energy before failure.

안전장구시험장치의 특성에 관한 연구

최명호(Myeong-Ho Choi),지용헌(Yong-heon Ji),곽상영(Sang-young Kwak),이순배(Soon-Bae Lee),김래진(Rea-Jin Kim),서삼문(Sam-Moon Suh),안희석(Heau-Seak An) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

본 연구는 안전장구 시험장치의 특성에 관한 것으로 기존 수동으로 시험하던 장치를 크게 개선하여 안전하고 편리하고 쉬운 시험이 가능하도록 원터치 형태로 자동시험이 가능하며 기존 구형장치를 대체하는 디지털화된 신개념의 “안전장구 시험장치”를 제시한다.

청국장의 발효기간에 따른 trans-Resveratrol과 비소화성 올리고당의 변화 및 항산화활성

최명호(Myounghyo Choi),조계만(Kyeman Cho),남상해(Sanghae Nam) 한국식품영양과학회 2014 한국식품영양과학회지 Vol.43 No.2

몇 가지 식물에서 발견되는 항독성 물질(phytoalexin)인 trans-resveratrol(3,5,4"-trihydroxy-trans-stilbene)은 항암, 항산화효과 및 심혈관질환 등에 효과가 큰 물질로 알려져 있으며, 포도, 땅콩 및 오디 등의 발효 시에 증가되어 그 효과가 커지는 것으로 알려져 있다. 한편 stachyose 및 raffinose 등의 기능성 올리고당은 장내 미생물의 생육을 도와 정장작용을 하는 것으로 알려져 있다. 따라서 본 연구에서는 3품종의 대두를 이용하여 제조한 청국장의 발효 중 trans-resveratrol과 기능성 올리고당의 함량 변화를 조사하였으며, 이에 따른 항산화효과를 알아보려고 하였다. trans-Resveratrol 함량은 원료 콩보다는 발효되었을 때 대체로 발효기간이 길어질수록 그 함량이 높게 나타났다. 특히 48시간 발효 후에는 3품종의 콩에서 늘찬, 대원 및 태광의 순으로 각각 50.06±0.82, 39.04±0.49, 34.00±0.54 μg/g이었으며, 원료 콩에 비하여 4배 이상 증가하였다. Stachyose 함량은 원료 콩에서 10.84±0.42~13.05±0.13 mg/g, 증자 직후에는 11.37±0.03~12.05±0.52 mg/g이었으나, 발효 12시간 후에는 0.16±0.01~0.33±0.02 mg/g으로 원료 콩에 비하여 97% 이상이 줄어들었으며 발효 24시간 후부터는 전혀 검출되지 않았다. 한편 raffinose의 함량은 원료 콩에서 2.66±0.09~3.54±0.05 mg/g으로 가장 낮았고, 증자 직후부터 발효 24시간 후에는 10.61±0.16~12.66±0.17 mg/g으로 약 3~4배가량 증가하였으나 48시간에서는 오히려 8.28±0.17~11.83±0.44 mg/g으로 감소하는 경향을 보였다. 청국장의 발효기간에 따른 항산화효과는 FRAP, DPPH, ABTS assay 모두에서 증자 직후에는 원료 콩에서보다 다소 낮게 나타났으나 대체로 발효기간이 길어짐에 따라 활성이 높아지는 경향이었다. 이와 같은 경향은 trans-resveratrol의 항산화활성이 DPPH, ABTS와 FRAP assay 등에서 RC50 값이 4.71±0.36~8.46±0.05 μg/mL인것을 미루어 볼 때, 발효기간에 따라 유의적으로 증가한 trans-resveratrol의 영향이 일부 있었을 것으로 생각되었다. 그러나 발효 중 기능성 올리고당(stachyose 및 raffinose)의 변화는 청국장의 항산화효과와는 관련이 없는 것으로 나타났다. Cheonggukjang was manufactured using three different kinds of soybeans, after which changes in the content of phytoalexins such as trans-resveratrol (3,5,4"-trihydroxy-trans-stilbene) were measured. Along with phytoalexins, changes in the content of functional oligosaccharides such as stachyose and raffinose were also measured, and the corresponding antioxidant activities were studied. The content of trans-resveratrol was found to be higher in fermented beans than in raw beans. Generally, the content was higher as the fermentation period increased. After 48 hours of fermentation, the contents of trans-resveratrol were 50.06±0.82, 39.04±0.49, and 34.00±0.54 μg/g (Nulchan, Daewon, and Taekwang), respectively, which is 4 times higher than the contents of raw beans. The contents of stachyose were 10.84±0.42~13.05±0.13 mg/g in raw beans, 11.37±0.03~12.05±0.52 mg/g immediately after boiling, and 0.16±0.01~0.33±0.02 mg/g after 12 hours of fermentation, which is a 97% decrease from those of raw beans. After 24 hours of fermentation, no amount of stachyose was detected. The contents of raffinose were the lowest in raw beans at 2.66±0.09~3.54±0.05 mg/g, but they increased 3~4 times between boiling and 24 hours of fermentation to 10.61±0.16~12.66±0.17 mg/g. However, raffinose content tended to decrease to 8.28±0.17~11.83±0.44 mg/g after 48 hours of fermentation. From FRAP, DPPH, and ABTS assays, antioxidant activities according to fermentation period of Cheonggukjang were rather low in boiled soybeans compare to raw soybeans. However, the activities were higher as the fermentation period increased. The antioxidant activity of trans-resveratrol showed an RC50 value of 4.71±0.36~8.46±0.05 μg/mL from the DPPH, ABTS, and FRAP assays. This could be partly due to the significant increase in trans-resveratrol according to fermentation periods. However, changes in functional oligosaccharides (stachyose and raffinose) during fermentation appear to not be related to the antioxidant effects of Cheonggukjang.

게임에서 보이는 라틴아메리카와 멕시코

최명호(Choi, Myoung-Ho) 한국라틴아메리카학회 2016 라틴아메리카연구 Vol.29 No.1

Although a global economic depression is currently occurring, the growth of video games as an industry is worthy of note. There is online internet service provides access to the video game from any smartphone or Tablet PC, and the user can communicate with other users. This means that the game is a form of mass media, and already the video game has played a role as the media of the next generation, a trend which will continue. This indicates that academically the game as a social and cultural phenomenon can be the objects of study for humanities and social sciences. Besides, from an aesthetic point of view the video game could be considered a new method to express beauty; from an artistic perspective it is a new genre of composite art, and from the narratological perspective in the theory of Herman Northrop Fryer it is a refined digital romance, and finally from the perspective of cultural assimilation it is a new method to be investigated, and also the method to spread Latin American and Mexican cultures. As the media of the next generation, the specialty of the video game is to be more repetitive than other media, which means the cultural genres that appear in the game can be stamped on the minds of users. In the case of Latin America, Mexico in particular looks like an uncontrolled region of wildness, especially when depicted in violent video games, which strengthens the cultural prejudices. In order to abandon these stereotypes, the creation of video games with respectful portrayals of Mexican tradition would be more prudent than the prohibition of circulation and consumption of violent video games. From now on, regional research should consider the game as an important subject of investigation, for example in terms of narrative structure, the mass media, the reaction of users, and the “gamification” of the culture, along with similar themes.