• 대한조선학회 특별논문집
• /
• 대한조선학회 2015년도 특별논문집
• /
• pp.50-55
• /
• 2015

Application of newly conceptualized Anti-Splash Devices designed for COT vent pipes were studied on a P/V valve located on the upper deck of an oil carrier vessel. Anti-Splash devices are used in the shipbuilding industry in order to avoid oil overflow and spray accidents caused by excess pressure and vacuum condition in the cargo oil tanks. These conditions are caused by the transverse and longitudinal sloshing forces that arise from ship motion during sea voyages. The main issue with existing Anti-Splash device model is flux at the outlet of the Anti-Splash Device, and so, new conceptual models for the Anti-Splash device were developed and compared to existing Anti-Splash device model using CFD analysis. Transient analysis was used to capture the flow and velocity of each model and a comparative analysis was performed between old and new-concept models. This data was used to determine the optimal design parameters in order to develop an optimized Anti-Splash Device. A Factory acceptance test was performed on the new-concept models in order to verify the performance and efficiency against their design requirements and other criterion. The final step performed was to apply the optimized Anti-Splash Device models for COT vent pipes to an actual vessel and verify performance through a seawater cargo operation during a sea voyage as per the ship owner's request. The patent for the aforementioned device was obtained by the Korean Intellectual property Office dated Dec. 18th,2014.

• 한국컴퓨터정보학회:학술대회논문집
• /
• 한국컴퓨터정보학회 2019년도 제59차 동계학술대회논문집 27권1호
• /
• pp.377-380
• /
• 2019

To accommodate for the difficult task of satisfying application's system timing constraints, we are developing Splash, a real time stream processing language for embedded AI applications. Splash is a graphical programming language that designs applications through data flow graph which, later automatically generates into codes. The codes are compiled and executed on top of the Splash runtime system. The Splash runtime system supports two aspects of the application. First, it supports the basic stream processing functions required for an application to operate on multiple streams of data. Second, it supports the checking and handling of the user configurated timing constraints. In this paper we explain the implementation of the first aspect of the Splash runtime system which is being developed using a real time communication middleware called DDS.

• 한국토양비료학회지
• /
• 제14권3호
• /
• pp.104-109
• /
• 1981

자연강우하(自然降雨下)에서 modified Ellison Cup에 의(依)해 Splash Erosion 양(量)을 각(各) 토성별(土性別) 작촌체계별(作付休系別)로 측정(測定)하였으며 Splash Erosion 양(量)과 강우인자(降雨因子)(R), 토양인자(土壤因子)(K), 작물인자(作物因子)(C)와 비교검토(比較檢討)한 결과(結果) 1. 콩-보리 재배시간중(裁培時間中) Splash Erosion 양(量)은 토성(土性)이 미세(微細)할수록 적었으며 식양토(埴壤土) 7.0ton, 양토(壤土) 9.7ton, 사양토(砂壤土) 9.0ton, 양질사토(壤質砂土) 12.6 ton/10a/년(年)이었다. 2. Splash Erosion 양(量)은 강우인자(降雨困子)(R치(値))와는 정(正)의 상관(相觀), 토양인자(土壤因子)(K치(値))와는 부(負)의 상관(相觀)이 있었다. 3. 작물인자(作物因子)에서 피복도(被覆度)가 50% 이내(以內)에서는 Splash Erosion과 강우인자(降雨因子) 사이에 상관(相觀)을 보였으나 피복도(被覆度)가 증가(增加)할수록 감소(減少)하고 90% 이상(以上)에서는 상관(相觀)이 없었다. 연간(年間) Splash Erosion 양(量)은 10~15ton/10a/년(年) 범위(範圍)이었다. 4. Splash Erosion에 의(依)하여 이동(移動)된 토양(土壤)의 입도(粒度) 분포(分布)는 원토양(原土壤)과 비슷하였으나 세사(細砂) ($250{\sim}100{\mu}$)가 가장 많이 비산(飛散)되었다.

• 한국동물위생학회지
• /
• 제32권3호
• /
• pp.287-292
• /
• 2009

This study was conducted to analyse risk factors which can influence on blood splash in slaughtered cattle in D slaughterhouse located in Gyeonggi province in 2008. A total of 13,056 cattle were studied by several risk factors such as species, gender, body weight, meat grade, weather (temperature), transport distance, lairaging time, moving time, mixing cattle from different sources. As the result of analysis, the total mean of blood splash was 0.70% and the rate was highest (0.94%) in castrated Hanwoo. The heavier body weight, the higher blood splash rate. The farms which have had more than one experience of blood splash tend to have high grade in meat quality. As a weather factor, the rate in summer season was lower than in winter season. It increased as transport distance getting longer and decreased when the lairaging time was 2~5 hours. We could know many risk factors strongly related with the occurrence of blood splash from this study.

• Corrosion Science and Technology
• /
• 제2권1호
• /
• pp.26-29
• /
• 2003

This study determined that the four corrosive characters of carbon steel in the marine splash zone (MSZ) in China's four sea areas. It has a range and a corrosion peak value. The rust in the MSZ plays the role of "depolarizer" in the cathodic process of corrosion. The growth law of the rust layer in MSZ has a character of "annual ring". In addition the reasons causing serious corrosion of carbon steel in the marine splash zone has been discussed in this paper.

• 한국생산제조학회지
• /
• 제22권5호
• /
• pp.782-788
• /
• 2013

This study addresses the issue of safety of the splash guard of a computer numerical control (CNC) machine tool at the design stage. As an impact test for evaluating safety requirements such as strength under the safety regulation is an expensive and iterative task, it is necessary to develop a new method to minimize the task of the impact test for development of the machine tool. In this study, explicit finite element method was adopted for replacement of the impact test of the splash guard of a machine tool at the design stage. A finite element model was developed for implementing the impact test on an actual vertical CNC lathe and then produced the analysis including plastic strain and deformation to enable the safety of its splash guard to be determined. The analysis results demonstrated that the finite element method can be applied to safety evaluation for design of the splash guard of a CNC machine tool.

• 로봇학회논문지
• /
• 제14권4호
• /
• pp.340-347
• /
• 2019

Due to advances in machine intelligence and increased demands for autonomous machines, the complexity of the underlying software platform is increasing at a rapid pace, overwhelming the developers with implementation details. We attempt to ease the burden that falls onto the developers by creating a graphical programming framework we named Splash. Splash is designed to provide an effective programming abstraction for autonomous machines that require stream processing. It also enables programmers to specify genuine, end-to-end timing constraints, which the Splash framework automatically monitors for violation. By utilizing the timing constraints, Splash provides three key language semantics: timing semantics, in-order delivery semantics, and rate-controlled data-driven stream processing semantics. These three semantics together collectively serve as a conceptual tool that can hide low-level details from programmers, allowing developers to focus on the main logic of their applications. In this paper, we introduce the three-language semantics in detail and explain their function in association with Splash's language constructs. Furthermore, we present the internal workings of the Splash programming framework and validate its effectiveness via a lane keeping assist system.

• 한국산학기술학회논문지
• /
• 제21권2호
• /
• pp.521-527
• /
• 2020

해양구조물에서 점성효과를 고려하여 항력에 기인한 평균 점성 표류력를 구하는 것은 최근까지 잘 고려되지 않았던 설계 요소이다. 특히 저주파 영역에서 파랑과 조류를 모두 고려한 수직 실린더에 작용하는 평균 점성 표류력에 대해 계산하는 것이 가장 중요하다. 따라서 본 연구에서는 파랑과 조류를 고려한 고정된 수직 실린더 구조물에 작용하는 평균 점성 표류력에 대해 해석적 수식 해를 도출하는 과정을 구체적으로 제시하였다. 실린더의 수면 위로 나온 부분을 Splash Zone, 수면 아래의 잠긴 부분을 Submerged Zone으로 구분하였다. 파랑이 존재하는 경우는 Splash Zone에서만 고려되고, 파랑과 조류를 포함한 경우는 Splash Zone과 Submerged Zone 모두에서 각각 식을 구하였다. Splash Zone 및 Submerged Zone에서 모두 상당한 점성 효과로 기인한 표류력이 발생한다. 따라서 본 연구에서 도출한 해석적 해를 통해 주어진 설계 변수들에 의한 평균 점성 표류력을 계산할 수 있으며, 각각의 Case에 해당하는 표류력의 크기가 구체적인 물리적인 범위 내에서 주도적인 영향을 끼치는지 판단할 수 있는 이론적 근거를 제시할 수 있다.

• 한국산학기술학회논문지
• /
• 제21권3호
• /
• pp.503-509
• /
• 2020

Semi-submergible, Tension-leg Platform 등과 같은 부유식 해양구조물에서 점성효과를 고려하여 항력에 기인한 점성 표류력를 구하는 것은 최근까지 잘 고려되지 않았던 설계 요소이다. 본 논문에서는 파랑과 조류를 고려한 부유식 수직 실린더 구조물에 작용하는 평균 점성 표류력에 대한 해석적 수식 해를 구하였다. 기존의 고정된 실린더에서 구한 방식과 같이 실린더의 수면 위로 나온 부분을 Splash Zone, 수면 아래의 잠긴 부분을 Submerged Zone 으로 구분하였다. 파랑이 존재하는 경우는 Splash zone 에서만 고려되고, 파랑과 조류를 포함한 경우는 Splash Zone 과 Submerged Zone 모두에서 각각 식을 구하였다. 기존 연구의 RAO 결과값을 활용하여 고정된 실린더에 작용하는 평균 점성 표류력의 계산 결과와 비교하였다. Splash Zone에서 파랑만 존재하는 경우를 제외하고 대부분의 주파수 영역 대에서 부유식 실린더에 작용하는 평균 점성 표류력의 크기가 상대적으로 고정된 실린더에 작용하는 표류력의 크기보다 크게 나오는 것을 볼 수 있으며, 특히 조류가 상대적으로 더 중요하게 고려되는 경우 더 크게 증가함을 알 수 있었다. 따라서, 본 연구 결과를 통해 부유식 해양 구조물 설계시 항력으로 인한 점성 표류력의 추론을 제시할 수 있다.

• Corrosion Science and Technology
• /
• 제14권4호
• /
• pp.190-194
• /
• 2015

The splash zone is the most corrosive area of the marine environment, and the corrosion of steel structures exposed in this area is a serious concern. DH36 steel is one of most commonly used steels for offshore oil platforms in China, and its corrosion behaviour in splash zones was studied in this paper. Polarization curves were obtained from the corroded steel exposed in this area while the morphologies and rusts of the rust steel were characterized using scanning electron microscopy and X-ray diffraction. Double rust layers were formed in the splash zone. The inner layer contained magnetite and fine flaky lepidocrocite, and the outer layer was composed of accumulated flaky lepidocrocite and a small amount of goethite. In the wet period, the iron dissolved and reacted with lepidocrocite, and magnetite appeared, while the magnetite was oxidized to lepidocrocite again during the dry period. Electrochemical reduction and chemical oxidization cycled in intermittent wetting and drying periods, and magnetite and lepidocrocite were involved in the reduction reaction, leading to serious corrosion.