• 한국지역사회생활과학회지
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• 제16권2호
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• pp.93-97
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• 2005

This study was conducted to clarify the morphological characteristics of Goheung native garlic variety compared with those of Spain and Taiwan varieties in Goheung region. Bulb fresh weights of Goheung, Spain and Taiwan varieties were 59.1g, 120.3g and 78.1g. Those bulb diameters were as followed that Spain 8.1cm, Taiwan 7.2cm and Goheung 5.3cm. And, bulb heights were Spain 5.4cm, Taiwan 4.4cm and Goheung 4.0cm. Bulb shape index of garlics by different varieties were increased in the order of Taiwan, Spain and Goheung products. Number of cloves produced in garlics were in the order of Goheung (12.1), Taiwan (11.4) and Spain (8.2) products. And clove fresh weight of garlics were Spain (7.7g), Taiwan (6.8g) and Goheung (4.6g) products. Clove height of garlics were in the order of Spain (2.8cm), Taiwan (2.4cm) and Goheung (2.1cm) products. And, clove diameter of garlics were Spain (2.1cm), Taiwan (1.7cm) and Goheung (1.3cm) products. Clove shape index of garlics by different varieties were increased in the order of Goheung (1.62), Taiwan (1.45) and Spain (1.32) products. Skin color differences in terms of a value were increased in the order of Goheung, Taiwan and Spain varieties. Surface color differences of flesh texture and peeled clove for garlics by the different garlic varieties were not significant.

• 연구논문집
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• 통권33호
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• pp.89-97
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• 2003

A barrel cam is used as a very important part of an index drive unit. The index drive unit must have an intermittent-rotational motion. The barrel typed cam and roller gear mechanism has the advantages of high reliability to perform a prescribed motion of a follower. This paper proposes a new method for the shape design of the barrel cam and also a CAD program is developed by using the proposed method. As defined in this paper, the relative velocity method for the shape design calculates the relative velocity of the follower versus cam at a center of roller, and then detemines a contact point by using the geometric relationships and the kinematic constraints, where the direction of the relative velocity must be parallel to a common tangential line at the contact point of two independent bodies, i.e. the cam and the follower. Then, the shape of the cam is defined by the coordinate transformation of the trace of the contact points. This paper presents shape design of the barrel cam in order to prove the accuracy of the proposed methods

• 한국해양공학회지
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• 제32권6호
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• pp.419-426
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• 2018

Recently, in an effort to reduce the energy efficiency design index (EEDI), studies on energy saving devices (ESDs) have been conducted. In this study, we designed a post-device suitable for a KRISO container ship (KCS) using computational fluid dynamics (CFD). In order to increase the efficiency of the post-device, a twisted rudder was used, which has a proven performance (showing a 1.34% reduction in DHP compared to the bare hull at 24 knots) in previous research at Pusan National University. In addition, an increase in efficiency was expected by the use of a rudder bulb, including the discontinuous section of the twisted rudder and a divergent propeller cap to prevent the contraction of the wake. The optimization criterion was the case where the delivery power was the least compared with the bare hull. We analyzed the cause of the efficiency increase through an analysis of the self-propulsion factor. The case study for optimization was divided into 4 types (1. clearance of the bulb and cap, 2. shape of the bulb, 3. size of the bulb and cap, and 4. asymmetric bulb). Finally, with a clearance of 50 mm from the ship, a spherical bulb with the cap having an angle of $5^{\circ}$, and an asymmetric rudder bulb with a bulb diameter of 1.2HH/1.4H (horizontal/vertical) showed a 2.05% reduction in DHP compared to the bare hull at 24 knots. We will fabricate a post-device that will be optimized in the future and verify the performance of the post-device through model tests.

• 생물환경조절학회지
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• 제22권1호
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• pp.43-47
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• 2013

본 연구는 양파자구의 주년생산 및 공급을 위하여 '조생썬더볼'과 '대지'를 이용하여 단일조건하에서 41일 동안 일장처리에 의한 자구의 생산성을 검토한 결과는 다음과 같다. 일장처리에 따른 엽수는 일장이 길어질수록 최대엽수에 도달하는 기간이 짧았으며, 품종별 최대엽수에 도달하는 기간은 조생종인 '조생썬더볼'이 중만생종인 '대지'에 비해 짧았다. 초장은 두 품종 모두 일장처리와 관계없이 계속 증가하였다. 구 비대의 진행정도는 '조생썬더볼'은 자연일장에 비해 모든 일장처리에서 현저히 촉진되었으나 '대지'는 광 중단 2시간 처리 및 16시간일장 연장처리에서만 촉진되었다. 구중과 구형을 종합한 상품구율은 자연일장, 광 중단 1시간, 광 중단 2시간 및 16시간 일장 연장처리에서 '조생썬더볼'은 각각 6%, 84%, 92% 및 90%였으며, '대지'는 각각 0%, 7%, 55% 및 64%였다. 따라서 단일조건하에서 단기간에 일장처리를 하여 절임용 자구를 생산하고자 하면 품종은 구 비대 한계일장이 짧은 조생종 품종, 일장처리는 일장의 연장에 비해 광중단 처리를 이용하는 것이 효율적인 것으로 판단된다.