燃料節約을 위한 舶用中速機關의 最適運轉條件에 關하여 : 實習船 釜山 403號를 中心으로 With training ship "Busan 403"

尹錫勳,金鍾華,金永植 釜山水産大學校 1985 釜山水産大學 硏究報告 Vol.25 No.2

釜山水産大學 實習船 釜山 403號의 主機關인 中速디젤機關을 利用하여 機關 冷却水溫度와 給氣溫度를 변화시키며 機關性能 및 燃燒性을 考察한 結果 다음과 같은 結論을 얻었다. 1. ??를 높임에 따라 ??가 上昇하며 ?? 10℃ 上昇時 ??는 約 7.6℃ 上昇하였으며, ??를 60℃로 하여 運轉하는 경우에도 공기과잉율의 低下에 의하여 燃燒性이 不良해지는 현상은 일어나지 않았다. 2. ?? 增加時 O₂濃度 감소, CO₂濃度 增加의 현상이 나타났으며 ?? 40℃일 때 ?? 25℃ 上昇時 공기과잉율은 約 0.41程度 低下하였으나 이러한 현상은 ??가 增加할수록 둔화되었다. 3. ??가 上昇함에 따라 同一한 공기과잉율에서 이산화탄소 생성량이 增加하였으며 이는 同一한 條件에서 冷却水溫度의 上昇에 따라 燃燒性이 向上됨을 알 수 있다. 4. 馬力當 燃料消費率이 가장 적은 것은 負荷 100% BHP의 경우이며 이때 正味燃料消費率은 173.76gr/BHPㆍh이다. This investigation tries to find the better operating condition that the fuel oil is saved for the medium speed diesel engine installed on training ship "Busan" 403˝. This study observes the performance and combustibility of the engine under the condition for various temperature of cooling water and scavenging air. The combustibility increases with the increase of the cooling water temperature. Though the temperature of scavenging air rises to 60℃, the combustion of the engine is good in condition.

"국민윤리" 敎科內容의 模型設定에 關한 一硏究

金渭錫,裵龍光,姜永晧,朴仁熙 慶北大學校 文理科大學 1977 文理學叢 Vol.4 No.-

Based upon the point of view that man would be able to get self-perfection only in community and that, on the other hand, just the man is the origin of vitality of community, writers believe that value education program is needed an useful in the university curriculum. And they found that in substantial character the value education program means the instruction which is not only for a student to adapt himself to the system of the community, but also criticize the system of the community in order to realize the best social conditions. Then, it is important to establish the substantial object of "National Ethics" and to constitute the contents of curriculum of it, which is suitable to accomplish the object of "National Ethics." According to the view mentioned above in this paper, writers attempted to establish a model of contents of "National Ethies" as a university curriculum. Writers think that the substantial object of "National Ethics" must be established with reference to the most important problems for the nation to be solved. Writers believe, therefore, that such problems as ① Primitive Unification, ② Industrialization ③ National Welfare ④ Abundance upon which discoursed A.F.K Organski in his "This Stage of Political Development," or as ① State-Building ② Nation-Building ③ Participation ④ Distribution of which stated G. A. Almond and G. B. Powell in their "Comparative Politics: Developmental Approach," are the most important for us to solve: because the history of modernization of Western Europe would suggest an End-State model for the underdeveloped nations. The following conclusions were derived from the present study: First, a statue of a human being as the substantial object of "National Ethics" is one who eager to solve and accomplish such problems mentioned above. Second, according to the suggestions of the history of modernization of Western Europe, the contents of curriculum of "National Ethics", which would be able to accomplish the substantial object of the "National Ethics," must be constituted with the contents which cultivate the patriotism. And from the history of modernization of Western Europe writers find out the facts that such modern spirits as positivism, rationalism and so forth rested on the basis of their traditional thought. And so, Koreanic modern spirits must be derived from her traditional thought. Then writers conclude that the contents of "National Ethics" must be constituted with "Korean thought" and the thought of "Chyung-Hyo" which is one of the Korean traditional morals. Third, writers concluded that it is reasonable to exclude the chapter of "The Philosophy of Political Science" and "Criticism of Communism" from the contents of curriculum of "National Ethics," which is contained in present text of "National Ethics," and to treat each one as a independent subject if it is possible. Fourth, a system of "Korean Thought" which is stated in this paper is an example for further study.

거대한 뇌수막류 수복후 두개골 재건술의 경험례

고영초,최병욱,서인석,하지운 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1

Encephalocele is defined as and "extracranial protrusion through a congenital opening in the skull. usually in the midline, of meninges, CSF, and/or cerebral parenchyma". The defect contatins only meninges and CSF or cerebral tissues as well, They can occur anywhere from the occiput to the nasofrontal region and are almost in the midline, Only rarely do they appear lateral to the sagittal plane. The authors experinced one case of encephalomeningocele and it was corrected by "Staged operation, the removal of encephalomeningocele, the V-P shunt operation and cranioplasty with calvarial bone graft and remodeling". After performing the staged operation we have followed the patient for about two years and the result was remarkably promising with normal development in speech, behavior, intellignce and physical status without any adverse neurologic sequelae.

삼차신경 척수감각핵 문측소핵내 유해성 뉴론의 특성에 관한 연구

온영석,박수정 大韓齒科保存學會 1999 Restorative Dentistry & Endodontics Vol.24 No.4

부산 금정산 주변 지하수의 수질 특성

김정숙,함세영,한석종 부산대학교 환경문제연구소 1998 環境硏究報 Vol.16 No.-

The purpose of this study is to examine chemical characteristics of groundwater for granitic and andesitic rocks in the vicinity of Mt. Geumjung, Pusan city, to establish the possible hydrogeochemical model of groundwater, and to evaluate the potential of groundwater pollution. According to the Piper diagram, groundwater in the study area mostly belongs to Ca^2^+-HCO_3 and Na^+-HCO_3 types. High concentration of Ca^2^- and Na^+ in groundwater are ascribed to the dissolution of plagioclase. Statistical methods (correlation analysis and factor analysis) were introduced to make the interpretation of analyzed data. Factor 1, consisting of pH, EC, Na^+, K^+, NH_4^+, Cl^- SO_4^2 and NO_3^-, explains the: effects of water-rock interaction such as dissolution of plagioclase and mica, and the influence of anthropogenic sources (domestic and industrial wastes). Factor 2, consisting of SiO_2, Ca^2^+ and HCO_3^- explains the dissolution of Ca-plagioclase. A hydrogeochemical modeling code, PHREEQC identifies and quantifies water-mineral reaction in fissures of the bedrock. The result of the modeling indicates the dissolution of major elements and formation of the kaolinite mineral.

부산 금정산일대 용천수, 지하수 및 지열수의 지화학적 특성

조명희,함세영,한석종,성익환,이병대,조병욱 부산대학교 환경문제연구소 1999 環境硏究報 Vol.17 No.1

Spring, groundwater and thermal water from the area and the vicinity of Mt. Geumjeong and Mt. Baekyang, Pusan city, has been sampled and analyzed for major and minor elements. According to the Piper diagram, spring water belongs to Ca^2^+-HCO_3^- and Na^+-HCO_3^- types, groundwater to Ca^2^+-HCO_3^- type, and thermal water to Na^+-CI^- type. Based on the phase stability diagrams of [Ca^2^+I/[H^+]^2, [Mg^2^^+I/[H^+]^2, and [Na^+I/[H^+] vs. [H_4SiO_4], spring water, groundwater and thermal water are mostly in equilibrium with kaolinite. The result of factor analysis shows three factors (factor 1,2 and factor 3) for the spring water, the groundwater and the thermal water which are represented by the influence of the dissolution of feldspar, calcite, anthropogenic sources (domestic and industrial wastes) and salt water.

Retrofilling 시 수종충전재료의 변연누출에 관한 연구

손호현,온영석 大韓齒科保存學會 1991 Restorative Dentistry & Endodontics Vol.16 No.2

超急冷 Ni_60B_40 合金의 構造 및 熱的 安定性에 관한 硏究(Ⅰ)

具滋洛,吳明錫,林榮彦,조성석 충남대학교 공업교육연구소 1981 論文集 Vol.4 No.2

The phase transformation and structure of rapidly quenched Ni_60B_40 alloy has been studied by x-ray diffraction and electrical resistivity measurements. The first step in the transformation of rapidly quenched Ni_60B_40 alloy was found to be Am+O-Ni_4B_3+m-Ni_4B_3 → O-Ni_4B_3+m-Ni_4B_3. The mechanism of transformation has been determined by the initially present microcrystallites in the amorphous matrix. The diffusional growth has three steps of growth of a disc with constant thickness, thickening of a disc and growth in axial direction only. The activation energy for crystallization is 43㎉/mole in the first step, 57㎉/mole in the second step and 55㎉/mole in the third step.

L-라이신 발효에 있어서 당밀전처리의 영향

신현철,김성준,성진석,전영중,이재흥 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.3

Can molasses, the most widely used carbon source for the industrial fermentation of L-lysine, usually contains a high concentration of calcium ions which tend to cause scaling problem in the recovery process. To remove the calcium ions, cane molasses was pretreated with sulfuric acid by adjusting the pH to 2.5~3.5. When the pretreated solution was directly heat-sterilized and used in the fermentation, a significant reduction in L-lysine production was observed. In this paper, we proved that sucrose is a superior substrate for L-lysine fermentation of that of glucose or fructose and that the above-mentioned decrease of L-lysine production was caused by the hydrolysis of sucrose in the molasses when the molasses was heat-sterilized at a low pH. The problem was overcome by adjusting the pH of molasses to neutral before sterilization.

이장재와 이장면적의 차이에 따른 인장결합강도의 변화

박종덕,이용우,온영석,이광원 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1

The purpose of this study was to extimate the changes of tensile bond strength according to the difference in lining materials and lining area. Seventy non-carious extracted human molars were used in the present study. and they were randomly assigned into 2 experimental groups according to the difference in lining materials. Each experimental group was subdivided into 3 groups according to the difference in lining area. Circular cavities were prepared on the dentin surface to a diameter of 1.5mm, 2.0mm, 2.5mm and the prepared cavities were filled with Fuji Ⅱ LC(Glass Ionomer Cement : GIC) or Dycal. Dentin specimens without circular cavity were used as control group. The primer and bonding agent of All-Bond 2 and composite resin(Z-100, 3M Dental Products, U. S. A.) were applied to the exposed dentin surface with or without lining. Tensile bond strengths for the experimental specimens were then measured. To examine the interface between dentin and liner & between liner and composite resin, two specimens from each group were fabricated and observed under the SEM. The results were as follows. 1. Tensile bond strength for the specimens lined with GIC was higher than that for specimens lined with Dycal. However, therer was no significant diffenence between two groups(p>0.05). 2. Tensile bond strength for the specimens lined with GIC in a diameter of 1.5mm(GIC-1.5mm lining group) was statistically higher than that for the GIC-2.0mm lining group(p<0.05). 3. Tensile bond strength for the specimens lined with Dycal in a diameter of 2.5mm(Dycal-2.5mm lining group)was statistically lower than that for Dycal-1.5mm lining group and Dycal-2.0mm lining group(p<0.05). 4. It was possible to observe the good adhesion of the resin composite to the GIC and the presence of a fissure between GIC and dentin all along the interface, Interfacial gaps of 7.2-72.2㎛ between GIC and dentin were observed. The interfacial gap between GIC and dentin at the cavity base was greater. However. the gap was gradually decreased toward the occlusal portion. 5. It was possible to observe the poor adhesion of the resin composite to the Dycal. The detachment of Dycal was occurred all along the composite resin-Dycal interface, and the gaps of 2.0-30.1㎛ were formed. In all the specimens. polymerization shrinkage of resin composite caused the detachment of Dycal from the body of Dycal. AT a Dycal-dentin interface, it was possible to observe the good adhesion, but poor adhesion with interfacial gap of 2.9-26.8㎛ were formed. In all the specimens. polymerization shrinkage of resin composite caused the detachment of Dycal from the body of Dycal. At a Dycal-dentin interface, it was possible to observe the good adhesion, but poor adhesion with interfacial gap of 2.9-26.8㎛ was observed partially.