목적 : 신체균형 측정기를 이용하여 주시거리와 다양한 시각 상태가 신체 안정성에 미치는 영향을 알아보고자 하였다. 방법 : 대상자는 총 23명(23.92±2.09세)으로 진행하였으며, 시각 조건은 모두 ‘완전교정, 흐림 조건(시력 0.5 logMAR 미만) 그리고 10° 이내의 시야’이다. 신체 안정성 측정은 ‘3D Guidance‘를 사용하였다. 결과 : 완전교정 상태에서는 주시거리 간 통계적으로 유의한 차이는 없었다(p>0.050). 그러나 흐림 조건에서는 주시거리에 따라 측면 및 전·후면 흔들림에서 유의한 차이가 확인되었으며(p=0.004, p=0.027), 시야가 10° 이 내로 제한되었을 때에도 유의한 신체 흔들림이 관찰되었다(p<0.050). 결론 : 주시거리에 따라 신체 안정성의 변화가 나타나며, 특히 흐림과 제한된 시야 상태에서는 주시거리에 따른 차이가 더 유의하였다.

In a self-level riser, the piston rod generates hydraulic pressure while reciprocating along the pump rod, so components such as rods and valves require precise processing technology. Among them, the design of the pump rod was changed to a spiral groove method because there was a risk of poor operation during eccentricity. In this paper, the design and 3D modeling of the pump rod were conducted, and the structural stability of the core part according to the load change applied to the pump rod was confirmed.

Physicochemical properties and storage stability of plant-based alternative meat prepared with low-fat soybean powder (LPAM) treated by supercritical-CO2 and those of full-fat soybean powder (FPAM) were compared. Ash and crude protein contents were higher in LPAM than in FRAM. Water absorption capacity and oil absorption capacity were significantly higher in LPAM than in FPAM. Water binding capacity was higher in LPAM than in FPAM during a 20 days storage period at 5℃ and pH was significantly lower in LPAM than in FPAM after a 5~10 days storage period. Hardness, gumminess and chewiness significantly increased with the increase in the storage period, and the three were significantly higher in LPAM than in FPAM after 10 days and 20 days of storage. The acid value showed no remarkable difference according to the storage period in LPAM; however, it was significantly higher in FPAM than in LPAM after 20 days of storage. The peroxide value and TBA value were significantly increased according to the storage period, and were significantly lower iin LPAM than in FPAM during all the storage periods. Therefore, the use of low-fat soybean powder may be effective in improving oxidative stability during storage in the production of plant-based alternative meat.

해양레저활동 인구증가 및 관련 산업의 급성장으로 인해 레저 선박을 접안하는 계류시설과 부유체를 기반으로 하는 해상부유 식 펜션 등 레저시설 수요가 증가하고 있으며, 이러한 연안에서 사용되는 부유체는 대부분 경량 부유체로서 중량이 상대적으로 경량이므 로 연안으로 유입되는 파(Wave)와 상재 하중에 의해 쉽게 경사가 발생하여 안정성이 낮아 안전사고가 빈번히 발생하고 있다. 이런 문제점 에 대한 해결방안으로 부유체의 운동저감장치를 연구하여 알리고자 한다. 본 연구논문에서는 부유체에 운동저감장치(기압차를 이용한 운 동저감장치)를 부착하여 운동저감효과를 부착하지 않은 부유체와 비교하는 방식으로 효과를 분석하였다. 효과분석은 전산해석시험으로 분석하여 부유체의 안정성 증가방법을 연구하고 그 효과를 검증해 보았다. 시험결과 분석결과 기압차를 이용한 운동저감장치를 부착한 부유체가 운동저감장치를 부착하지 않은 부유체보다 파랑에 대한 운동량이 저감되어 부유체의 안정성이 증가된 것으로 분석되었다. 이러 한 부유체의 운동저감 장치는 무동력 선박뿐만 아니라 동력선, 반잠수식 선박에서도 유용하게 사용될 것으로 판단되어 다양한 분야에 적 용하여 연구를 진행할 계획이다.

In this study, we performed thermal safety design of the electric module of a heat-loaded equipment with consideration of its heat dissipation performance. Initially, we calculated the heat dissipation of natural convection to choose a cooling method. Based on this, we found that some modules required forced convection and selected an air-cooling method with an outdoor temperature of 43 degrees Celsius, which is the maximum temperature in Korea. Prior to module production, we performed thermal analysis of each module and proceeded with a design to increase the thermal conductivity of the module as a primary step, and subsequently proceeded with Heat Sink design to maximize the heat dissipation performance. After considering various constraints according to the system requirements and designing the cooling path, we experimentally and analytically secured thermal safety at the operating temperature of the equipment.

The object of this study is to evaluate whether the means of egress of Jechon Sports Center and Miryang Sejong Hospital, where massive fire human casualties occurred in 2017 and 2018 respectively, comply with NFPA 101(Life Safety Code), and to suggest the need for supplementation of domestic means of egress regulations. The study evaluated the number and arrangement of the means of egress, travel distance, common path of travel, dead end and discharge from exit for each building by applying the means of egress regulations of NFPA 101. As a result of the evaluation through NFPA 101, the travel distance was appropriate, but some of the other items except for the travel distance did not meet NFPA 101. The regulations that need to be supplemented are 1)occupant load calculation 2)egress capacity calculation 3)continuous concept of means of egress 4)concept of common path of travel. It is especially necessary to revise the requirement for fire door of the evacuation floor(normal 1st floor) of the stairwell in case of below the five story building.

We investigate the austenite stability in nanocrystalline Fe-7%Mn-X%Mo (X = 0, 1, and 2) alloys fabricated by spark plasma sintering. Mo is known as a ferrite stabilizing element, whereas Mn is an austenite stabilizing element, and many studies have focused on the effect of Mn addition on austenite stability. Herein, the volume fraction of austenite in nanocrystalline Fe-7%Mn alloys with different Mo contents is measured using X-ray diffraction. Using a disk compressive test, austenite in Fe–Mn–Mo alloys is confirmed to transform into strain-induced martensite during plastic deformation by a disk d. The variation in austenite stability in response to the addition of Mo is quantitatively evaluated by comparing the k-parameters of the kinetic equation for the strain-induced martensite transformation.

The purpose of this study was to investigate the antioxidant activities, quality characteristics, and storage stability of perilla oil mayonnaise (PM) with different levels of onion powder (OP) from 0 to 3%. As the amount of OP increased, the L, a, and b values increased, but pH decreased (p<0.05). The addition of OP raised viscosity (p<0.05). The addition of OP to PM proportionally increased the total phenolic content, and antioxidant activities as measured by DPPH and ABTS radical scavenging activity, and FRAP assay. When compared to PM without OP, PM that contained OP had a peroxide value that was almost 1.94 times lower. The emulsion stability was between 97.62 to 94.92% in the PM without OP and PM with OP groups was 99.60% for 12 weeks. This study showed that the inclusion of OP in PM has the potential to inprove its quality, antioxidant activities, and storage stability.

Sea anchor for fishery is commonly used in jigging fishery and purse seine. The study of sea anchor was studied for improvement of opening efficiency and drag by changing the type of shape and the diameter of vent. However, standard specification of sea anchor is not set and has not been studied for underwater stability. Therefore, this study aimed to improve underwater stability of sea anchor by changing a vent diameter and weight of sinker. The experiment was conducted in flume water tank. The experiment model of sea anchor was made from actual model of sea anchor which is used in fishery by similarity law. The model of sea anchor was designed to different types of vent diameter and weight of sinker in different current speed. The value of movement of side to side (X-axis), drag of sea anchor (Y-axis) and movement of up and down (Z-axis) was measured for 30 seconds. Each value of X, Y, Z-axis was analyzed through t-test and ANOVA analysis to verify that each value had a significant difference according to the difference compositions. There was correlation between the movement of X-axis and Z-axis. The drag of sea anchor was stronger as the current speed increased. However, the larger the vent diameter, the weaker the drag. From the result of the standard deviation, the movement of X-axis was inversely proportional to the vent diameter. However, movement of Z-axis was larger as the weight of sinker was the heaviest or lightest from the result of the standard deviation. These results suggest that the sea anchor should be combined with proper size of the vent diameter and the weight of sinker to improve the stability.