• Culinary science and hospitality research
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• v.12 no.1 s.28
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• pp.93-110
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• 2006

Eumsik-dimibang is the oldest and first cooking recipe book in Korean language ever published in Korea. It was examined in order to find out food ingredients being used as side dishes and its cooking methods used at that time. As side dishes, there were many foods which used dogs as food ingredients for making Gae Jang Jim and Gae Jang etc. as well as Dong A such as Dong A Nurumi and Dong A sun. Also, there were many foods prepared by Nurumi cooking method for making Gae Jang Guk, Nurumi, eggplant Nurumi etc. From cooking methods for food ingredients for side dishes at that time, following characteristics could be found. First, there was a cooking method of broiling meat on fire after blanching it in water. Second, many cooking methods were used to remove fetid smells and fishy smells (using ginger, pepper, cheoncho etc). Third, there was a method which demanded much attention and devotion in the course of cooking. Fourth, use and cooking method of flour were diversified.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.836-839
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• 2005

A limit switch box is used for a indicator of a valve actuator. This device indicates an opening and closing of a valve or throttle in a valve actuator. In a ship, equipments are required safety and robustness because of a rough environment and a specific condition during a voyage. However, the limit switch box is used in an indoor environment generally. In order to evaluate the endurance of the limit switch box used in an indoor environment, the endurance tests against salt water have been conducted. Experiment results showed that the limit switch box was corroded severely. Thus, this study developed a new limit switch box which can be used at an outdoor environment. The housing of the developed limit switch box was made by an stainless steel to prevent corrosion.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.338_339
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• 2009

송전전압을 배전전압으로 변성하여 고객에게 배분하는 154kV 주변압기의 경우 과거 옥외철구형 변전소에서는 주로 동을 이용한 모선을 이용하였다. 최근 부지확보의 어려움 및 빈번한 민원 발생으로 지하 또는 옥내변전소로 바뀌어 가는 추세이고 과거 동모선 방식에서 케이블을 이용한 방식이 선호되고 있다. 모선방식의 경우는 구리나 알루미늄 바의 부식문제, 습기문제, 그리고 좁은 공간에서 사용시 절연 문제 등과 관련하여 지속적인 관리가 요구되고 있으나 케이블을 사용할 경우 이러한 문제들로부터 벗어날 수 있는 이점을 가지고 있다. 그러나 케이블을 사용하여 대전류를 송전할 경우 단일 케이블의 허용전류 용량에 따른 제한으로 복수의 케이블을 병렬 연결하여 사용하여야 한다. 그러나 케이블 동상 병렬사용시 케이블 포설 방식에 따라 동상간의 불평형전류 차가 심하게 발생한다. 본 논문에서는 이러한 송 배전 선로의 불평형전류 현황을 알아보고, 송전선로에 있어서 상배열 변경 및 배전선의 동상 케이블 배열방법을 변경함으로써 불평형전류를 최소화 하여 최적의 계통상태 유지를 위한 방안을 찾고자 한다.

• Journal of the Korean Society for Railway
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• v.12 no.1
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• pp.161-166
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• 2009

DC feeding system is mainly floating but rail potential and leakage current are due to long parallelism between rails and ground, namely rail resistance and rail to ground conductance. Rail potential causes electric shock to human and rail leakage current causes electrolytic corrosion to nearby the buried metals. Therefore the design technologies to reduce, protect and monitor these effects are important in recent DC feeding system. Rail potential and leakage current are analysed based on propagation theory that is utilized. Monitoring and controlling rail leakage current is proposed in order to maintain rail resistance and rail to ground conductance.

• Journal of Korea Foundry Society
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• v.34 no.2
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• pp.60-66
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• 2014

A Zr-based amorphous alloy specimen was produced by vacuum die casting process. The salt spray test was carried out using the specimens in the as-cast, $Al_2O_3$ and $ZrO_2$ particle blasted state. Using these specimens, the SEM-EDX and XRD analyses, DSC measurement and bending strength test were conducted. After the salt spray test, the specimens were not experienced phase change and thermal characteristics of the alloys were remained unchanged. In the as-cast specimen, corrosion products were not observed. However, in the $Al_2O_3$ particle blasted specimen, pitting corrosion occurred and the detected corrosion products were $ZrCl_2$ and $NaZrO_3$. Due to the salt spray test, bending strength of the $Al_2O_3$ blasted specimens showed about 100 MPa lower strength than the other specimens. The bending fracture surface was vein pattern which was shown typically in the amorphous alloys.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07a
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• pp.343-346
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• 2003

A systematic study of Cu CMP in terms of the effect of slurry chemicals(oxidizer, corrosion inhibitor, complexing agent) on the process characteristics has been performed. In acidic media, a corrosion inhibitor, benzotriazole(BTA) and tolytriazol(TTA) was used to control the removal rate and avoid isotropic etching. When complexing agent is added with $H_2O_2$ 2wt% in the slurry, a corrosion rate was presented very good. Most of in, it was appeared that BTA is possible to be replaced by TTA. The tartaric acid was distinguished for the effect among complexing agents. n we apply this results to copper CMP process, it is thought that we will be able to obtain better yield.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.33 no.3
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• pp.202-208
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• 1997

The component materials threatened by cavitation include ship propellers as well as turbine runners, pump impellers, pipe lines and radiators. Today it is known that cavitation damage takes place on many other components including on the coding water side of the cylinder liners of diesel engines. Cavitation erosion - corrosion implies damage to materials due to the shock pressure or shock wave that results when bubbles form and collapse at a metal surface within a liquid. To suppress cavitation erosion as well as cavitation erosion - corrosion to hydraulic equipment, innovations such as the improvement in the geometric design of the equipment or the selection of suitably resistant construction materials are necessary. In this study, we investigated that the cavitation erosion - corrosion damage under vibratory cavitation can be reduced by adding of side now velocity to the cavitation bubble group in order to eliminate bubbles formed in sea water environment.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.34 no.2
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• pp.223-230
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• 1998

Recently, with the rapid development in the industries such as mechanical plants, automobiles, ships and marine structures, it is enlarged by the use of the SS 41 steel. This mechanical plants and marine structures are exposed m corrosion because of Cl-under marine environments. To protect their accidents, mainly applied anti-corrosion epoxy coating and various protective its structures. In this study, corrosion control characteristics on the epoxy coating were investigated by the galvanic corrosion of impressed voltage tester under marine environments The main results obtained are as follows; 1. Corrosion current density of amine-epoxy coating becomes more increased than that of other epoxy coating and the time area rate of pin hole and pit until 5% becomes most rapid. 2. The potential of SUS 304 stainless steel(cathode) for Al-epoxy coating is nearly zero potential. 3. Corrosion current density of Amine-epoxy by shot blast becomes more decreased than that of not shot blast and cathodic potential becomes more noble. 4. As distance of anode and cathode is more decreased, corrosion current density of epoxy coating is more increased and cathodic potential becomes less noble.

• Journal of the Korea institute for structural maintenance and inspection
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• v.18 no.3
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• pp.69-75
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• 2014

The priority of repair areas are chosen with the probability distribution of 0.3mm wide crack and carbonation induced corrosion. Data is analyzed and evaluated based on the 28 section of Precise Inspection for Safety and Diagnosis (PISD) in seoul. As the crack is distributed in log-normal, the carbonation and cover are in normal distribution. To have rational in repair sections among 503 sheets of underground structure, it is adopted the reliability index as well as the environment factors: strength, sonic speed, $CO_2$ concentration, corrosion, and content of chloride.

• Korean Journal of Materials Research
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• v.18 no.5
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• pp.259-265
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• 2008

The corrosion and degradation factors of a current collector in a molten carbonate fuel cell (MCFC) were investigated to determine the optimized coating thickness of nickel on STS316L. The results show that the surface morphology and electrical properties depended on the nickel coating thickness. The surface morphology gradually changed from a flat to a porous structure along as the nickel coating thickness decreased, and the electrical resistance of the nickel-coated STS316L increased as the nickel coating thickness decreased. This can be attributed to the diffusion of elements of Fe and Cr from the substrate through the nickel grain boundaries. Additionally, carburization in the metal grains or grain boundaries in an anodic environment was found to influence the electrical properties due to matrix distortion. The resistance of Cr-oxide layers formed in an anodic environment causes a drop in the potential, resulting in a decrease in the system efficiency.