월경 중에도 착용 가능한 ‘365 컴피 무브아 스포츠 레깅스’ 개발

조민서(Min-Seo Cho),장혜수(Hea-Soo Jang),Ngo Thi Mai Ngoc 계명대학교 생활과학연구소 2021 科學論集 Vol.46 No.-

In this study, we developed the ‘365 Comfortable Mouvoir Leggings’ that combined sports leggings and sanitary pad integral panty structure which can relieve discomfort of female consumers during menstruation. As a result, three types of leggings were designed with a four-layer structure fabrics to absorb menstrual blood and make waterproofing possible. As a result of proto typing and wearing test of TYPE 1 and TYPE 2, problems of pattern structure and fabric were found, and the improvements were corrected and supplemented to complete the final TYPE 3 prototype. The completed ‘365 Comfortable Mouvoir Leggings’ is a four-layer structure absorption fabric pad attached existing leggings, forming ‘lining/absorption later/waterproof layer’. Additionally, it is designed with the incision line between the two legs and the curved incision line from the point where the dart starts in front of the waistline to the bottom of the calf and the knee incision line pattern that emphasizes the beauty of a woman’s body while considering muscle movement during strength exercise.

복합 링크기구를 이용한 다족 보행로봇

임상현(Sang-Hyun Im),이동훈(Dong Hoon Lee),강현창(Hyun Chang Kang),김상현(Sang-Hyun Kim) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.11

Generally, multi-legged walking robots have excellent mobility in rough and uneven terrain, and they are deployed for the safety of rescuers in various disaster environments. However, as each leg is driven by a number of actuators, it leads to a complicated structure and high power consumption; therefore, it is difficult to put them into practical use. In this article, a new concept is proposed of a walking robot whose legs are driven by a complex linkage structure to overcome the deficiencies of conventional multi-legged walking robots. A double crank-rocker mechanism is proposed, making it possible for one DC motor to actuate the left and right movements of two neighboring thighs of the multi-legged walking robot. Each leg can also move up and down through an improved cam structure. Finally, each mechanism is connected by spur and bevel gears, so that only two DC motors can drive all legs of the walking robot. The feasibility of the designed complex linkage mechanism was verified using the UG NX program. It was confirmed through actual production that the proposed multi-legged walking robot performs the desired motion.

Analysis of a preliminary configuration for a floating wind turbine

H.F. Wang,Y.H. Fan,Iñigo Moreno 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.3

There are many theoretical analyses and experimental studies of the hydrodynamics for the tension leg platform (TLP) of a floating wind turbine. However, there has been little research on the arrangement of the TLP’s internal structure. In this study, a TLP model and a 5-MW wind turbine model as proposed by the Minstitute of Technology and the National Renewable Energy Laboratory have been adopted, respectively, to comprehensively analyze wind effects and wave and current combinations. The external additional coupling loads on the TLP and the effects of the loads on variables of the internal structure have been calculated. The study investigates preliminary layout parameters-namely, the thickness of the tension leg body, the contact mode of the top tower on the tension leg, the internal stiffening arrangement, and the formation of the spoke structure-and conducts sensitivity analyses of the TLP internal structure. Stress is found to be at a maximum at the top of the tension leg structure and the maximum stress has low sensitivity to the load application point. Different methods of reducing maximum stress have been researched and analyzed, and the effectiveness of these methods is analyzed. Filling of the spoke structure with concrete is discussed. Since the TLP structure for offshore wind power is still under early exploration, arrangements and the configuration of the internal structure, exploration and improvements are ongoing. With regard to its research and analysis process, this paper aims to guide future applications of tension leg structures for floating wind turbine.

Structure & Installation Engineering for Offshore Jack-up Rigs

박주신,하영수,장기복,Park, Joo-Shin,Ha, Yeong-Su,Jang, Ki-Bok,Radha, Radha The Society of Naval Architects of Korea 2017 大韓造船學會誌 Vol.54 No.4

잭업 드릴링 리그는 해양 원유 및 가스개발 분야에 폭넓게 사용되어지고 있다. 초기 모델은 수심 60미터 이하의 천수영역에서 운용되었고, 최근에는 대수심 150미터와 가혹한 환경조건에 대응하도록 개발이 되어 왔다. 본 기고에서는 북해 유전에 사용되는 잭업리그의 전선해석을 수치해석방법을 통하여 검토하였다. 첫번째로, 북해의 환경조건을 분석하고, 해저지질조사 보고서를 통하여 지질특성을 확인하였다. 조사자료를 근거로 기본도를 작성할 수 있는 설계사양을 수립하였다. 북해에 설치된 잭업리그의 동적특성을 규명하기 위해서, 전선해석 시 레그와 선체를 고려한 전도모멘트를 계산하고, 잭업리그 leg & 선체구조의 건전성 확인을 위하여, 국제코드를 활용한 구조강도 평가 수행으로 안전성을 검토하였다. 잭업하는 도중 발생할 수 있는 불확실성 요소들은 해저면의 특성에 크게 관련되어 있으며, 일반적으로 pre-loading하는 과정 중에 자주 발생한다. 이 기고에서는 잭업리그의 운용하는 사이클 내에서 발생 가능한 구조적 안전성을 검증하기 위하여 상세구조 및 설치엔지니어링 문제에 대해서 분석하였다. 이러한 목적에 부합하기 위하여 아래의 사항들을 검토하였다. - 해저지질 조건을 고려한 구조붕괴거동 - Pre-loading 절차서 및 매개변수에 의한 붕괴모드 - 계측자료의 검증 및 구조엔지니어링 결과. Jack-up drilling rigs are widely used in offshore oil and gas exploration industry. It is originally designed for use in the shallow waters less than 60m of water depth; there is growing demand for their use in deeper water depth over 150m and harsher environmental conditions. In this study, global in-place analysis of jack-up rig leg for North-sea oil well is performed through numerical analysis. Firstly, environmental conditions and seabed characteristics at the North-sea are collected and investigated measurements from survey report. Based on these data, design specifications are established and the overall basic design is performed. Dynamic characteristics of the jack-up rig for North-sea are considered in the global in-place analysis both leg and hull and the basic stability against overturning moment is also analyzed. The structural integrity of the jack-up rig leg/hull is verified through the code checks and the adequate safety margin is observed. The uncertainty in jack-up behaviour is greatly influenced by the uncertainties in the soil characteristics that determine the resistance of the foundation to the forces imposed by the jack-up structure. Among the risks above mentioned, the punch-through during pre-loading is the most frequently encountered foundation problem for jack-up rigs. The objective of this paper is to clarify the detailed structure and installation engineering matters for prove the structural safety of jack-up rigs during operation. With this intention the following items are addressed; - Characteristics of structural behavior considering soil effect against environmental loads - Modes of failure and related pre-loading procedure and parameters - Typical results of structural engineering and verification by actual measurement.

Structure & Installation Engineering for Offshore Jack-up Rigs

Joo-Shin Park,Yeong-Su Ha,Ki-Bok Jang,Radha 대한조선학회 2017 大韓造船學會誌 Vol.54 No.4

잭업 드릴링 리그는 해양 원유 및 가스개발 분야에 폭넓게 사용되어지고 있다. 초기 모델은 수심 60미터 이하의 천수영역에서 운용되었고, 최근에는 대수심 150미터와 가혹한 환경조건에 대응하도록 개발이 되어 왔다. 본 기고에서는 북해 유전에 사용되는 잭업리그의 전선해석을 수치해석방법을 통하여 검토하였다. 첫번째로, 북해의 환경조건을 분석하고, 해저지질조사 보고서를 통하여 지질특성을 확인하였다. 조사자료를 근거로 기본도를 작성할 수 있는 설계사양을 수립하였다. 북해에 설치된 잭업리그의 동적특성을 규명하기 위해서, 전선해석 시 레그와 선체를 고려한 전도모멘트를 계산하고, 잭업리그 leg & 선체구조의 건전성 확인을 위하여, 국제코드를 활용한 구조강도 평가 수행으로 안전성을 검토하였다. 잭업하는 도중 발생할 수 있는 불확실성 요소들은 해저면의 특성에 크게 관련되어 있으며, 일반적으로 pre-loading하는 과정 중에 자주 발생한다. 이 기고에서는 잭업리그의 운용하는 사이클 내에서 발생 가능한 구조적 안전성을 검증하기 위하여 상세구조 및 설치엔지니어링 문제에 대해서 분석하였다. 이러한 목적에 부합하기 위하여 아래의 사항들을 검토하였다. - 해저지질 조건을 고려한 구조붕괴거동 - Pre-loading 절차서 및 매개변수에 의한 붕괴모드 - 계측자료의 검증 및 구조엔지니어링 결과 Jack-up drilling rigs are widely used in offshore oil and gas exploration industry. It is originally designed for use in the shallow waters less than 60m of water depth; there is growing demand for their use in deeper water depth over 150m and harsher environmental conditions. In this study, global in-place analysis of jack-up rig leg for North-sea oil well is performed through numerical analysis. Firstly, environmental conditions and seabed characteristics at the North-sea are collected and investigated measurements from survey report. Based on these data, design specifications are established and the overall basic design is performed. Dynamic characteristics of the jack-up rig for North-sea are considered in the global in-place analysis both leg and hull and the basic stability against overturning moment is also analyzed. The structural integrity of the jack-up rig leg/hull is verified through the code checks and the adequate safety margin is observed. The uncertainty in jack-up behaviour is greatly influenced by the uncertainties in the soil characteristics that determine the resistance of the foundation to the forces imposed by the jack-up structure. Among the risks above mentioned, the punch-through during pre-loading is the most frequently encountered foundation problem for jack-up rigs. The objective of this paper is to clarify the detailed structure and installation engineering matters for prove the structural safety of jack-up rigs during operation. With this intention the following items are addressed; - Characteristics of structural behavior considering soil effect against environmental loads - Modes of failure and related pre-loading procedure and parameters - Typical results of structural engineering and verification by actual measurement

Stiffness characteristics of compliant three segment leg with the self-stable region in slow and fast running

Oh-Seok Kwon,Sung-Mok Ha,이동하 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.12

In this paper, we propose the stiffness characteristics of compliant three segment leg that can have a self-stable region in slow and fast running. This proposition can contribute to reducing the control effort and enhancing the locomotion energy efficiency for the compliant three segment legged robot in slow and fast running. Previous research indicated that the running self-stable region of the spring-mass system is located in a relatively fast running region and that of the two segment leg is located in a relatively slow running region. In this paper, we analyze the stiffness characteristics of the spring-mass system and the two segment leg to explain the previous research results. From this analysis, we propose the stiffness characteristics of the compliant three segment leg with a self-stable region in slow and fast running. We further design the compliant three segment leg based on this proposition and check its structural stability. We examine the running self-stable region of this compliant three segment leg to determine whether it has a self-stable region in slow and fast running. We also examine the walking self-stable region of this compliant three segment leg.

A new design concept for ocean nuclear power plants using tension leg platform

Chaemin Lee,Jaemin Kim,Seongpil Cho 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.76 No.3

This paper presents a new design concept for ocean nuclear power plants (ONPPs) using a tension leg platform (TLP). The system-integrated modular advanced reactor, which is one of the successful small modular reactors, is mounted for demonstration. The authors define the design requirements and parameters, modularize and rearrange the nuclear and other facilities, and propose a new total general arrangement. The most fundamental level of design results for the platform and tendon system are provided, and the construction procedure and safety features are discussed. The integrated passive safety system developed for the gravity based structure-type ONPP is also available in the TLP-type ONPP with minor modifications. The safety system fully utilizes the benefits of the ocean environment, and enhances the safety features of the proposed concept. For the verification of the design concept, hydrodynamic analyses are performed using the commercial software ANSYS AQWA with the Pierson-Moskowitz and JONSWAP wave spectra that represent various ocean environments and the results are discussed.

Robust Control Allocation of Redundantly Actuated Variable Structure Systems

Sang-ik An,Dong-Soo Kwon 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10

This paper proposes new robust control allocation method of redundantly actuated variable structure systems. The original system is divided into two subsystems by factorizing the input matrix. Then all system uncertainties can be treated with the virtual control input. The control strategy has two steps. At the first step the virtual control input is found with sliding mode control with perturbation estimation method (SMCPE) considering system uncertainties then at the second step the real control input is calculated by using the Quadratic Optimization method. The simulation is conducted with the redundantly actuated leg-wheel hybrid structures which have 4 actuators and 3DOFs. The state-space model is derived from the dynamic equation with kinematic and dynamic constraints. The effect of kinematic error is also studied.

Falcon 9 벤치마킹을 통한 재사용형 발사체 구조 기술 분석

이준성(Junseong Lee),이금오(Keum-Oh Lee),박순영(Soonyoung Park) 한국추진공학회 2020 한국추진공학회 학술대회논문집 Vol.2020 No.11

소모성 발사체로 설계된 시스템을 큰 틀을 유지한 상태에서 재사용형 발사체로 변경할 수 있는 기술이 있다면 한국의 미래발사체 프로그램에 적용이 가능할까? SpaceX의 Falcon 9 발사체는 임무 성능을 개선하기 위해 Merlin 엔진뿐만 아니라 추진제탱크, 복합재료 동체, 추력 구조물의 경량화 설계를 단계적으로 진행해왔다. 본 연구에서는 재사용형 발사체의 상징인 착륙용 다리와 정밀 유도용 그리드 핀의 요소 기술을 파악하고, 이를 시스템에 적용하기 위해, 추진제를 과냉각하여 탑재하고, 발사체 시스템의 중량 배분을 어떻게 조정했는지 Falcon 9 벤치마킹을 통해 살펴보았다. If there is a technology that can change a system designed as an expendable launch vehicle to a reusable one while maintaining a basic architecture, is it possible to apply it to a future launcher program in Korea? SpaceX"s Falcon 9 launch vehicle has been gradually transformed to improve a mission performance by upgrading the Merlin engine as well as the propellant tank, composite fuselage, and thrust structure. In this study, through Falcon 9 benchmarking, we are going to figure out how the structures related to the vehicle reusability are working and how the system mass budget is managed to adopt the additional landing legs and grid fins by densification of the propellants.

Analysis of Structure Type of Stacking Chair

Shin, Young-Sik Korea Furniture Society 2007 한국가구학회지 Vol.18 No.4

As life style changes, the demand for stacking chairs are increasing as the use of event halls or outside furniture where people gather in crowd is increasing. Early stacking chairs were mainly made to pile up a great amount and store, but in modern days it also has a decorative purpose. Besides, the development of various new materials and applied technology of furniture manufacture, the structure and design of stacking chair is becoming more interesting. Basically, according to the structure of the leg, the form and method of piling up is decided. The structure of the leg means the location of the leg connected to the seat, and according to the location, it can be piled up as upper, front, or rotational type. Such is the way how stacking chairs are classified according to the location of the leg, with its basis; the structure of stacking chair is reviewed. Now, chair for piling up is overcoming its simple function, which aesthetic beauty or arrangement of color after piling up is being considered. Also, according to storing, moving, and the place of use, various designs are demanded. As people's interest in stacking chair is increasing, various research regarding design should continue.