• Journal of the Korean Society of Industry Convergence
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• v.22 no.5
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• pp.561-573
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• 2019

This study proposes a new approach to implement smart factory based on robot monitoring system for a small and medium sized enterprise. The simulator includes the forward kinematics and inverse kinematics analyzes of articulated robots. We also modeled the dynamics of the robot and made it possible to simulate it in the program. We studied the interface between the user and the monitoring programming system using the GUI environment of Windows OS, and it is configured to select the appropriate trajectory planning and control method. The reliability of simulator is illustrated by simulation test.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.229-232
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• 2004

컴포넌트는 일반적으로 객체 모델링을 기반으로 설계되고 개발되기 때문에 상호작용과 협력의 표현, 상속으로 인한 재사용 문제 등을 해결하는 데는 한계가 있으며 복잡한 구조를 가진 대규모 시스템에서 컴포넌트를 추출하기에는 용이하지 않다. 따라서 객체 모델링을 보완하기 위하여 객체 중심이 아닌 객체의 역할을 중심으로 하는 역할 모델링 기법이 제안되었다. 본 연구는 UML 기반에서 다양한 관점의 역할 모델을 표현하여 컴포넌트를 추출하는데 활용할 수 있도록 한다.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.433-434
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• 2020

본 논문은 단상 영구자석 동기 전동기의 가변속 운전을 위한 가변 비례공진 전류 제어 기법을 제안한다. 단상 영구자석 동기 전동기의 전류 제어 시 3상 교류 전동기에 널리 적용되는 벡터 제어를 적용할 경우, 필연적으로 좌표변환 및 가상의 q축 성분 생성을 위한 과정이 요구된다. 하지만, 단상 영구자석 동기 전동기의 구조적인 특징을 고려하여 비례공진 제어 기법을 적용하게 되면 3상 교류 시스템에서 필요로 하는 추가적인 좌표변환 과정이 요구되지 않는다. 이에 본 논문에서는 가변속 운전에 따른 공진 주파수 변화를 반영한 가변 비례공진 전류제어 기법을 제안하고자 한다. 제안한 전류 제어 기법의 효용성을 검증하기 위해 다수의 실험을 진행하였다.

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.435-436
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• 2020

본 논문에서는 단상 영구자석 동기 전동기의 센서리스 운전을 위한 회전자 자극 검출 기법을 제안한다. 제안한 회전자 초기 자극 검출 방법은 비대칭 공극을 갖는 단상 영구자석 동기 전동기에 고주파 전압 및 옵셋 전류를 인가하여 회전자 자극 위치에 따른 전류 옵셋의 크기를 검출함에 있다. 이를 위해 가상의 dq축 모델을 이용한 고정자 전류의 크기를 비교하여 회전자 자극을 검출하고자 한다. 제안된 방법은 다수의 실험 결과를 통해 타당성을 입증하였다.

• 축산식품과학과 산업
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• v.9 no.2
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• pp.36-45
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• 2020

• Journal of the Korean Society of Industry Convergence
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• v.25 no.1
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• pp.79-86
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• 2022

In general, since the types and types of ships, so complex and various variables are included to measure the amount of construction work. In addition, it is mot easy to predict the schedule or the number of working hours before ship construction, and it is also mostly inaccurate. As a result, the master plan is manually drawn up by the expert's experience, but there are limitations due to various factors. Medium and large shipyards are operating APS(Advanced Planning and Scheduling) system that reflects industrial characteristics to improve productivity in the planning stage, and utilize information from systems such as ERP(Enterprise Resource Planning) system and MES (Manufacturing Execution System). On the other hand, small shipyards rely mostly on manual work such as Excel work based on the experience of the workers. Therefore, this study intends to develop a master plan management system that can efficiently manage the production process from the business planning stage in consideration of the characteristics of small shipyards.

• Journal of Life Science
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• v.34 no.4
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• pp.236-244
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• 2024

Melanin is a natural pigment found in most plants and animals, and it is involved in determining the color of the skin and hair. Melanogenesis is a reactive occurrence in melanocytes aiming to protect the skin from external stimuli, such as ultraviolet rays. Tyrosine is involved in the biosynthesis of the substrate tyrosine into melanin. However, melanin overproduction can lead to skin diseases, such as melasma, blotching, hyperpigmentation, and skin cancer. Although many studies have been conducted on whitening substances, such as kojic acid and arbutin, some countries have banned or refrained from using them due to their side effects. Therefore, this study assessed the potential of horseradish (HR) as a new whitening agent in cosmetic products. For efficient extraction, subcritical water extraction was conducted. The results showed that the horseradish subcritical water 200℃ (SW 200) extract showed high DPPH radical scavenging ability, total phenolic contents (TPC), inhibiting tyrosinase activity and inhibiting melanin production of B16-F10 melanoma cell lines. To investigate its cytotoxicity to the B16-F10 melanoma cell lines, MTT reduction assay and morphological changes were observed. No cytotoxicity was found in horseradish methanol extract and SW 200. In conclusion, this research suggests the possibility of horseradish subcritical water may be useful as a natural whitening ingredient to be used in cosmetic products.

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.95-95
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.101-101
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• 2018

• Proceedings of the Korean Society of Crop Science Conference
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• 2018.10a
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• pp.106-106
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• 2018