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.

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.

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.

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.

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.

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.

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.

소매전문점에서의 관계마케팅요인과 관계품질 그리고 점포충성도와의 관계

박명호(Park Myung-Ho),정정일(Jung Jung-Il) 한국유통학회 2006 流通硏究 Vol.11 No.4

본 연구에서는 소매전문점에서의 관계마케팅요인(고객화, 전문성, 커뮤니케이션, 유대)이 관계품질(신뢰, 만족) 및 점포충성도에 미치는 영향을 실증적으로 검정하였다. 그 결과 커뮤니케이션을 제외한 모든 관계마케팅요인이 관계품질에 긍정적인 영향을 미치고 있고 그 가운데 고객화가 관계품질 형성에 가장 높은 영향을 미치는 것으로 나타났다. 또한 소비자 특성변수(성별과 거래경험 및 다양성 추구성향)에 따른 조절효과에서는 관계마케팅요인에 따라 중요도에 차이는 있으나, 커뮤니케이션을 제외한 모든 관계마케팅요인이 관계품질에 긍정적인 영향을 미쳐 최종적으로 점포충성도를 형성하는 것을 확인할 수 있었다. 소매전문점은 고객과의 관계형성에 있어 대형점포보다는 유리한 조건에 있다. 그러므로 개별 고객들의 성향을 면밀히 파악하여 맞춤식 서비스를 제공하는 고객화와 고객들과의 관계형성을 위한 종업원의 전문성 및 유대관계가 소매전문점 고객의 점포충성도를 형성하는 중요한 요인임이 확인되었다. This study investigates the relationship between the relationship marketing factors, relationship quality and store loyalty in retail specialty stores. The customization of a retail specialty store was found to be having a larger effect on relationship quality than other factors such as expertise, bonding and communication and the moderating effects of customer characteristic was found be having a larger effect on relationship quality all factors except to communication. The result of this study has some practical implications. First of all, the customization strategy for individual customers is needed because customers trusted employees who provide a customized service more. Second, the employees' expertise is important to obtain the trust of customers. Third, the findings of the study showed that the communication with employees did not affect the trust. Rather, customers more often want price discounts, useful information, other benefits related to transactions. The communication is also necessary to bond a strong relationship with customers, as well as to respond customer's requests immediately. Fourth, the marketing managers of the store have to effectively manage the customer relationship with the special consideration to the customer's gender, transaction experience, and variety seeking disposition.

경영진의 주가연계보상이 부채의 만기구조에 미치는 영향

박명호 ( Myung Ho Park ),박대근 ( Dae Keun Park ),윤정선 ( Jeong Sun Yun ) 보험연구원 2012 보험금융연구 Vol.23 No.3

본 논문은 경영진의 주가연계보상이 부채의 만기구조에 미치는 영향을 유동성 위험과 투자기회를 고려하여 분석하였다. 분석 결과, 경영진 지분은 부채의 만기구조에 직접적인 영향을 미치지는 않는 것으로 나타났다. 그러나 두 변수 사이의 관계는 유동성 위험과 투자기회에 따라 다른 것으로 나타났다. 유동성 위험과 경영진 지분, 그리고 투자기회와 경영진 지분 간의 교차효과를 분석한바 유동성 위험이 낮은 기업에서는 경영진 지분이 부채의 만기구조에 부(-)의 영향을 미치는 것으로 나타났다. 이는 주주와 경영진 간의 이해가 일치할수록 경영진의 단기부채에 대한 선호도가 증가하지만 유동성 위험이 높을 경우에는 장기부채를 선호한다는 것을 시사한다. 또한 투자기회가 높은 기업의 경우 경영진 지분이 부채의 만기구조에 부(-)의 영향을 미치는 것으로 나타났다. 이는 투자기회가 높은 기업은 주주와 경영진 간의 이해상충으로 인한 과소투자를 방지하기 위하여 단기부채를 선호할 것이라는 과소투자가설의 예측과 부합하는 결과이다. This paper investigates whether and how corporate governance affects the maturity structure of corporate debts in Korea. We find that managerial ownership tends to reduce the maturity of debts for a low-liquidity risk firm. On the other hand, firms with liquidity risk prefer a long-term debt regardless of managerial ownership. This suggests that corporate governance tends to reduce the maturity of debt only for the firms that do not experience liquidity risk. We also find that the interaction effect between managerial ownership and growth opportunity is negative. This implies that the negative effect of managerial ownership is more prominent for firms with growth opportunity.

생계급여의 구축효과가 기초연금제도의 소득재분배 및 빈곤완화에 미치는 영향

박명호 ( Myung-ho Park ),윤정선 ( Jeongsun Yun ),박대근 ( Dae Keun Park ) 한국재정정책학회 2021 財政政策論集 Vol.23 No.4

This paper analyzes whether and how livelihood benefits crowd out the income redistribution and poverty alleviation effects of the recent basic pension reforms through a microsimulation model based on the 13th NaSTaB. The results first show that the current basic pension system greatly contributed to income redistribution and poverty alleviation compared to the counterfactual case where there were no basic pension. However, compared to the pre-reform system, the effect of the recent series of basic pension reforms are not so large because the proportion of households receiving basic pension was not high in all households. On the other hand, in terms of poverty alleviation, we find that the relative poverty rate and poverty gap rate were significantly improved compared to the counterfactual case where there were no basic pension. In addition, it seems to have contributed not only to helping poor households out of poverty, but also to lowering the depth of poverty in poor households. Lastly, we find that the crowding out effects of livelihood benefits did not have a significant impact on the income redistribution and poverty alleviation effects of the recent basic pension reforms because there were not many simultaneous recipients of basic pension and livelihood benefits.