선박용 가솔린/CNG Bi-fuel 엔진개조 기술 개발

박명호,Park, Myung-Ho 한국마린엔지니어링학회 2010 한국마린엔지니어링학회지 Vol.34 No.5

천연가스는 메탄을 주성분으로 하는 청정한 대체연료로 자동차나 트럭 등에 압축천연가스와 액화천연가스 형태로 사용할 수 있다. 그리고, 천연가스만을 사용하는 전소엔진과 가솔린 및 천연가스를 동시에 사용할 수 있는 겸용엔진이 있으며, 특히, 겸용엔진의 경우 두가지 연료를 동시에 사용할 수 있는 것으로 정의할 수 있다. 본 연구에서는 선박용 가솔린 시스템을 인젝터, 레귤레이터, 연료탱크 및 전자제어장치로 구성된 압축 천연가스 겸용시스템으로 전환시켜 연료시스템과 동력값을 비교하였다. 그 결과, 천연가스엔진의 경우 적은 배출가스를 나타내었으며 최대동력은 가솔린엔진과 비교 약 7%정도 감소함을 확인할 수 있었다. Natural gas, a fossil fuel contained mostly of methane, is one of the cleanest alternative fuels. It can be used in the form of compressed gas(CNG) or liquefied natural gas(LNG) to cars and trucks. And, dedicated natural gas vehicles are designed to run on natural gas only, while Bi-fuel vehicles can also run on gasoline or CNG, especially, bi-fuel can be defined as the simultaneous combustion of two fuels. In this study, converted gasoline marine system to CNG Bi-fuel system which is made up of injector, regulator, tank and ECU is converted. And estimated the fuel system and engine power compared the result with gasoline engine is estimated. As a result, CNG engine shows low exhaust emissions but maxium power is 7% reduced compared to gasoline engine.

의치사의 교육과정에 관한 연구

박명호,배봉진,이화식,이희경,Park, Myung-Ho,Bae, Bong-Jin,Lee, Hwa-Sik,Lee, Hee-Kyung 대한치과기공학회 2010 대한치과기공학회지 Vol.32 No.1

As Korea is entering an aging society, the number of elderly people who need new denture or who have problems with their existing denture or adjacent tissue is increasing and it will double in 2018. Therefore, denture clinician system will lessen patients financial burden and introduce market economy to the dental prosthesis field. Therefore, Korea needs to adopt denture clinician system as soon as possible as USA or Canada to increase people s accessibility in quality and quantity. Denture clinician will determine the size and shape of denture after performing oral examination, make impression using various materials, fabricate denture, deliver and adjust completed denture to the patient, repair denture, and carry out financial management in the denture fabricating company or manage human resources. Considering denture clinicians services, American and European education system seems to be close to our system. Therefore, in this study, basic curriculums of several countries in Europe and America were reviewed and curriculum that meets Korean situation was suggested.

국내산(國內産) RDF의 배출(排出)가스 특성(特性) 비교실험(比較實驗)

박명호,Park, Myung-Ho 한국자원리싸이클링학회 2007 資源 리싸이클링 Vol.16 No.6

본 연구는 에너지의 합리적 이용 및 산업폐기물의 재활용을 위하여 고효율 폐기물 고형연료의 개발을 목표로 하였다. 이 분야의 대부분의 연구는 킬른과 같은 대형연소장치에 집중하여 연구가 이루어졌기 때문에 본 연구에서는 화격자연소방식인 열용량 $66{\sim}132m^2$ 규모의 소용량 열시스템에 초점을 맞추었다. 실험은 RDF, 코크스 및 폐타이어 3종류의 연료를 이용하여 질량값 및 열량값의 변화를 측정하였으며 CO, $CO_2$, NO, $NO_2$ 등의 연소가스 분석 실험을 수행하였다. 연소가스분석결과 RDF의 CO 농도값은 코크스와 폐타이어보다 높았으며. RDF 및 코크스의 NO, $CO_2$, $SO_2$의 농도값은 폐타이어보다는 낮은 값을 나타내었다. This study aimed at developing high-efficiency RDF(refuse derived fuels) fuel in order to use RDF energy rationally and to recycle industrial product. As most studies in this area are concentrated in large combustion apparatuses such as kilns, but this study was focused on the small-sized heating systems, applying them directly to grate type boiler which has a heating capacity of $66{\sim}132m^2$. The different kinds of fuel are experimented including RDF. Coke and Waste Tire. First, for this, we experimented and analyzed RDF to see the change in its mass and heating value. Also, four kinds of exhaust gas are sampled by gas analyzer including CO, $CO_2$, NO and $NO_2$ at different temperature. As a result, the levels of CO concentration of RDF are higher than these of coke and waste tire. But, the levels of NO, $CO_2$ and $SO_2$ concentration of RDF and coke were lower then the levels when waste tire is burned.

개에서 Tiletamine-Zolazepam 마취에 대한 Doxapram과 Yohimbine의 길항효과

박명호,김명철,Park Myeong-ho,Kim Myung-cheol 한국임상수의학회 1995 한국임상수의학회지 Vol.12 No.1

This study was performed to examine the general anesthetic efficacy of tiletamine-zolazepam, a mixture of phencyclidine-derived tiletamine and benzodiazepine-related zolazepam. The antagonistic activities of doxapram and yohimbine to the anesthetic effects of tiletamine-zolazepam were also studied. Thirty healthy mongrel dogs were divided into three groups (each of 10) twenty minutes after being anesthetized with tiletamine-zolazepam : T-Z-S group(tiletamine-zolazepam-saline), T-Z-D group (tiletamine -zolazepam-doxapram), T-Z-Y group (tiletamine-zolaz.pam-yohim bine). Various parameters wert evaluated in terms of the onset and recovery time of analgesia, respiration rates, hear rates, body temperature, electrocardiogram, blood chemistry, and lymphocyte blastogenesis. The results obtained through these experiment could be summarized as follows: 1. he anesthetic efficacy of tiletamine-zolazepam was considered desirable, with the onset time of anesthesia being as short as 0.23-0.24 minutes. 2. Both of the antagonistic effects of yohimbine and doxapram on the anesthesia induced by liletamine-zolazepan were evaluated statistically significant(p<0.05) as the recovery time was shortened from 39.3$\pm$4.9 min(T-Z-S group) to 25.3$\pm$2.9 nin(T-Z-Y group) and 29.9$\pm$8.8min(T-Z-D group), respectively. 3. Respiration rates were not changed by the treatments of both doxapram and yohimbine, with the only transient increase in the T-Z-D group. The changes in the respiration rate were not observed during the whole time course of the experiment. 4. Yohimbine(T-Z-Y group) increased the heart rate significantly from 30 minutes after the adminstration compared to the T-Z-S group and T-Z-D group (p<0.05). 5. The decreases in th, body temporature were observed from 30 minutes in the T-Z-S group(p<0.05) and 40 minutes in th, T-Z-D group(p<0.05), after the adminstration. On the other hand, there was no hypothermia in the T-Z-Y group. 6. In the all experimental groups of the T-Z-S, T-Z-D and T-Z-Y, there were no specific findings on the electrocardiograph incept slight shift to the tachycardia in all cases. 1. We could not find any differences in the blood chemistry between all experimental groups (T-Z-S, T-Z-D and T-Z-Y). 8. the inhibition of the lymphocyte blastogenesis shown in the T-Z-S with 3 hours decreasing and thereafter restoring to the normal values up to the point 5 hours were not occurred in the T-Z-D and T-Z-Y groups. With the above results, we could conclude that both doxapram and yohimbine can be clinically used as recovery agents towards anesthesia by tiletamine- zolazepam fi:on the efficacy point of view, but yohimbine is more recommendable in this case if considering the recovery time and lymphocyte blastogenesis.

천연가스 연료의 연소특성에 관한 연구

박명호,이선봉,Park, Myung Ho,Lee, Sun Bong 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.10

This study is concerned about the combustion characteristics of methane-air and methane/hydrogen-air mainly the behavior of burning velocity including the effect of the ignition energy. The experiments were conducted in a spherical combustion bomb designed in this laboratory. The burning velocities were measured by the pressure-time history and the reaction rates were estimated theoretically. The experimental results showed that the burning velocity increased by 25 to 50 percent when hydrogen is added to methane by 20 percent.

S. mutans에 항균력(抗菌力)을 나타내는 균주(菌株)의 배양학적(培養學的) 성질(性質)

박명호,Park, Myung-Ho 대한치과기공학회 1999 대한치과기공학회지 Vol.21 No.1

토양시료로부터 치아우식원인균인 S. mutans에 대하여 항균력을 나타내는 방선균주를 순수분리하여 분리균주를 공시균주로 하여 항생물질 생성에 미치는 환경인자를 규명하였다. 본 공시균주의 항생물질 생성 최적배지조성은 Bacto-soytone 1%, glucose 1%, NaCl 0.5%, $CaCO_3$ 0.1% 였으며 배지의 초기 pH는 7.0이었다. 또한 항생물질은 $28^{\circ}C$에서 진탕배양시 생성의 최적조건이었으며 본 공시균주는 24시간 유도기를 거쳐 배양 72시간째 항생물질의 생성과 더불어 균의 최대증식도를 나타내었다. The optimum culture conditions for an antibiotics from Actinomyces sp. were investigated. The optimum composition of medium for antibiotics production was 1% glucose, 1% soybean meal, 0.5% NaCl, 0.1% $CaCO_2$, and the optimum initial pH was 7.0. And the antibiotics showed highest activity when the strain isolated from soil was aerobically cultivated at $28^{\circ}C$ for 72hours under the optimum conditions. A production of the antibiotics from Actinomyces sp. begins at the 36th hours and then reached the maximum at the stationary phase developed at the 72th hours under the optimum conditions.

국민학교 6학년 아동의 치아우식 발생에 미치는 타액성 요인 분석

박명호,Park, Myung-Ho 대한치과기공학회 1988 대한치과기공학회지 Vol.10 No.1

저자는 대구시내에 거주하는 국민학교 6학년생 64명과 농촌지역에 거주하는 국민학교 6학년생 58명 총 122명을 대상으로 Snyder 검사, 타액완충능 검사 및 타액분비량을 측정하여 이들과 DMFT 및 DMFS index와의 상호관계를 분석해 보았던 바 다음과 같은 결론을 얻었다. 1. Snyder 검사에 양성인자는 78.7%이었고, 양성인자중 현자한 자는 29.5%, 중등도인자는 30.3%, 경도인자는 18.7%이었고, 음성인자는 21.3%이었다. 2. Snyder 검사에 음성반응을 나타낸 군이 양성반응을 나타낸 군에 비해 DMFT 및 DMFS index가 현저히 낮았다(P<0.01). 3. 도시와 농촌지역 아동으로 나눈 Snyder 검사 결과 음성반응은 도시지역 아동이 73.45%, 농촌지역 아동이 84.48%이었다. 4. 자극성 타액의 분비량은 남자가 6.97$\pm$2.57, 여자가 6.34$\pm$2.45로 남자가 조금 높게 나타났으나 유의성은 없었다(P>0.05). 5. 자극성 타액분비량이 평균치 이하인 군이 평균치 이상인 군보다 월등히 높은 DMFT 및 DMFS index를 나타내었다(P<0.01). 6. 도시와 농촌지역 아동으로 구분한 타액분비량 측정결과 도시지역 아동이 약간 높았으나 유의성은 없었다(P>0.05). 7. 타액완충능은 남자가 7.65$\pm$2.19, 여자가 6.80$\pm$1.67로 남자가 유의성 있게 높게 나타났다(P<0.05). 8. 타액완충능이 평균치 이하인군이 평균치 이상인 군보다 월등히 높은 DMFT 및 DMFS index를 나타내었다(P<0.01). 9. 도시와 농촌지역 아동으로 나눈 타액 완충능 검사결과 도시지역 아동이 유의성 있게 높이 나타났다. 10. 자극성 타액분비량과 타액의 완충능이 높을 경우 영구치 우식발생에 억제적인 효과가 있음을 확인하였다. For the detection of the active cariogenic factors contributing to caries development, some practical methods such as the Snyder test, estimation of salivary flow rate and salivary buffering capacity test were evaluated statistically by comparing DMFT and DMFS indexes. Total 122 children (62 male and 60 female ; 64 rural and 58 urban) were selected ramdomly from the 6th grade of the primary school and their salivary cariogenic factors were analysed and evaluated. Among the total 122 children, 78.7% was positive in the snyder test in which the marked, moderate and slight caries activities were 29.5%, 30.3% and 18.9%, respectively. In the Snyder test, 74.45% was positive in urban children while 84.48% was positive in rural children. DMFT and DMFS indexes were markedly lower in negative group than positive group of the Snyder test (p<0.01). The mean and standard deviation of stimulated salivary flow rate was 6.97$\pm$2.57 in male and 6.34$\pm$2.54 in female but no significant difference was observed in sexuality. The stimulated salivary flow rate of urban children was slightly higher that of rural but there was no significant difference between them. However, the group that showed below average in the stimulated salivary flow rate was markedly higher in DMFI and DMFT indexes than the group of above average. The mean and standard deviation of stimulated salivary buffering capacity was 7.65$\pm$2.19 in male and 6.80$\pm$1.67 in female. This difference was significant statistically(p<0.05). Stimulated salivary buffering capacity of urban children was higher than that of rural. Increases in stimulated salivary flow rate and buffering capacity had reduced the onset of dental caries of 14-year-old permanent tooth.

번호이동성 시차 도입이 이동통신시장 및 경제적 후생에 미치는 영향

박명호 ( Park Myung Ho ),오완근 ( Oh Wan Keun ),이충섭 ( Lee Chung Seop ) 한국경제학회 2004 經濟學硏究 Vol.52 No.1

We studied the effect of 6-month lagged number portability policy on Korean mobile market and economic welfare. Our result shows that in the first year fo the policy, dominant carrier`s market share is decreased while the others are increased. However, after the introduction year of 2004, dominant carrier`s market share is rather increased. This phenomenon shows that the sequential number portability policy does not guarantee the effective compeition to loosen dominant carrier`s monopolistic power in Korean mobile market. The effect of the policy on economic welfare is about 332 billion Won (local currency) in the case of no sequential introduction and that of 6-month lagged introduction case is about 306 billion Won which is less than 7.87%. The 0.3 Won per minute decrease in price can make up the welfare loss of the sequential introduction.

한국 농지개혁의 파급효과: 농민생활을 중심으로

박명호 ( Myung Ho Park ) 한국비교경제학회 2015 비교경제연구 Vol.22 No.2

한국의 농지개혁은 단기간에 소작제도가 철폐되었다는 점에서 매우 성공적인 사례로 인정받는다. 본고는 한국의 농지개혁의 효과를 경제 및 사회적 측면에서 살펴보았다. 우선 경제적 관점에서는 농지개혁이 소득재분배 및 산업자본 형성에 어떤 영향을 미쳤는지 문헌 및 당시 자료를 통해 고찰하였다. 농지개혁은 지주계급의 몰락을 초래할 정도로 지주에게 엄청난 피해를 주었다. 반면, 농지개혁의 주된 목표의 하나이었던 지주 토지자본의 산업자본화는 성공적이지 못하였다. 그렇지만 농지개혁은 지가증권을 갖고 귀속재산을 불하받을 수 있도록 함으로써 일부 자본가 계급의 산업자본 형성에 기여한 것으로 나타났다. 농지개혁이 사회적 측면에서 미친 효과를 농민의 생활수준을 중심으로 고찰하였다. 농지개혁은 한국전쟁과 맞물려 전쟁의 부담을 직접 감당해야 했던 농민에게 엄청난 피해를 주었으며, 미군의 잉여농산물 도입 역시 농민생활에 큰타격을 주었다. 한편, 농지개혁과 농민생활 수준 관련 실증 분석 결과 소작률은 농민생활에 큰 영향을 미친 것으로 나타났다. 반면 조세부담과 잉여 농산물도입은 도입 시점에만 영향을 미쳤을 뿐 지속적인 효과를 보이지는 않은 것으로 나타났다. Korea’s land reform was promoted as part of the U.S.’s anticommunism strategy for the occupying countries after World War II. After the liberation from Japanese colonial rule, Korea was an agricultural society where tenant-farming households accounted for 86% of the total farm households. It is certainly required to convert landlord oriented land ownership into independent farmer oriented land ownership. Land reform’s impact was not limited to the agricultural sector since land reform had a decisive effect on Korea’s industrialization by promoting human capital development. On one hand, results of land reform are examined from an economic perspective such as income distribution, industrialization, human capital development. On the other hand, abolition of the landlord system and farmer’s standard of living are examined from a social perspective. Based on existing studies on land reform, a quantitative analysis on the effects of land reform on human capital, and farmer’s standard of living is conducted.

소득 충격의 지속성이 예비적 저축과 한계소비성향에 미치는 효과: 분석적 접근

박명호 ( Myung Ho Park ) 한국국제경제학회 2007 국제경제연구 Vol.13 No.3