• 한국공작기계학회논문집
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• 제18권2호
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• pp.207-213
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• 2009

The bundling process is the final step in vegetable manufacturing, however, the process is a little difficult to be automatized, because vegetable has the physical properties of roughness, softness, and fragility etc. In this paper, we proposed an automatic bundling mechanism for vegetable based on the heat melt sticking. The proposed mechanism consists of three modules, one module is the moving part for aligning of the vegetable shape and adjusting of the vegetable tension, second module is the arm driving part for the vegetable binding and the band roll releasing, and third module is band joining, band cutting, and band feeding part for the vegetable binding continuously. Through this research, Using the SMO(SimDesigner Motion) module, we optimize condition of mechanical movement of the bundling mechanism. This bundling system designed in order to binding 288 bundle/hour.

• 한국정보과학회논문지:시스템및이론
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• 제31권1_2호
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• pp.27-40
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• 2004

OSGi 서비스 프레임워크는 다음과 같은 몇 가지 특성을 갖는다. 첫째, 서비스가 번들이라는 자체 설치 가능한 컴포넌트 형태로 제공되어 동적으로 배치된다. 둘째, 서비스가 생명주기에 따라 동적이며 다른 서비스와의 상호 작용이 자주 일어난다. 셋째, 홈 게이트웨이의 시스템 자원이 충분하지 않다. 이러한 특성들로 인하여 네트워크 상에서 인증되지 않은 오퍼레이터에 의해 악의적인 서비스가 배치될 수 있거나 서비스가 변질 될 수 있다. 이러한 변경된 서비스 번들은 서비스 게이트웨이는 물론 사용자에게 보안상의 악영향을 준다. 더불어 현재 OSGi 프레임워크 표준안에는 위의 특성을 고려한 서비스 번들 인증 메커니즘이 제시되어 있지 않다. 따라서 본 논문은 서비스 플랫폼 상에서의 특성을 고려한 서비스 번들 인증 메커니즘을 제안하고자 한다. 본 논문에서는 서비스 번들의 안전한 전송을 위해서 장치를 인식하고 초기설정을 하는 초기화 작업인 부트스트래핑 단계에서 키 공유를 위한 메커니즘을 설계하였고, 이 단계에서 생성된 공유 비밀키를 이용한 MAC 기반 서비스 번들 인증 메커니즘을 제시하였다. 또한 BAN Logic을 이용해 키 공유 메커니즘과 서비스 번들 인증 메커니즘의 안전성을 검증하였다. 이와 같은 서비스 번들 인증 메커니즘은 기존의 PKI 기반의 서비스 번들 인증이나 OSGi에서 권고하고 있는 RSH 프로토콜과 비교해 볼 때 저장 공간이나 연산의 제약된 자원을 가지고 있는 서비스 플랫폼 상에서 더 효율적이다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제40회 동계학술대회 초록집
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• pp.450-450
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• 2011

This study reports the hydrogen sulfide gas sensing properties of ZnO nanorods bundle and the investigation of gas sensing mechanism. Also the improvement of sensing properties was also studied through the application of ZnO heterstructured nanorods. The 1-Dimensional ZnO nano-structure was synthesized by hydrothermal method and ZnO nano-heterostructures were prepared by sonochemical reaction. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectra confirmed a well-crystalline ZnO of hexagonal structure. The gas response of ZnO nanorods bundle sensor increased with increasing temperature, which is thought to be due to chemical reaction of nanorods with gas molecules. Through analysis of X-ray photoelectron spectroscopy (XPS), the sensing mechanism of ZnO nanorods bundle sensor was explained by well-known surface reaction between ZnO surface atoms and hydrogen sulfide. However at high sensing temperature, chemical conversion of ZnO nanorods becomes a dominant sensing mechanism in current system. In order to improve the gas sensing properties, simple type of gas sensor was fabricated with ZnO nano-heterostructures, which were prepared by deposition of CuO, Au on the ZnO nanorods bundle. These heteronanostructures show higher gas response and higher current level than ZnO nanorods bundle. The gas sensing mechanism of the heteronanostructure can be explained by the chemical conversion of sensing material through the reaction with target gas.

• 한국생산제조학회지
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• 제18권4호
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• pp.375-380
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• 2009

In this paper, it has been proposed an automatic vegetable bundling mechanism that makes use of heat melt sticking. The proposed mechanism is consisted of three modules for the rationality of manufacture. Design specification has been determined by the bundling mechanism that was optimized mechanically. And, it has been manufactured the prototype of the automatic bundling machine. It has been carried out directly the field test for verification of performance in farmhouse which produces vegetable. In field test, this bundling machine showed efficiency of about 3.6 times than the manual working by manpower, and other performance it got satisfied result. This automatic vegetable-bundling machine was already registered as the agricultural machine. and This machine will be commercialized soon.

• Nuclear Engineering and Technology
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• 제53권2호
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• pp.439-445
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• 2021

In view of the complex geometric structure of the rod bundle channel and the limitation of the current CHF visualization experiment technology, it is very difficult to obtain the rod bundle CHF mechanism directly through the phenomenon of the rod bundle CHF visualization experiment. In order to obtain the applicable CHF mechanism assumption for rod bundle channel, firstly, five most representative DNB type round tube CHF mechanistic models are obtained with evaluation and screening. Then these original round tube CHF mechanistic models based on inlet conditions are converted to local conditions and coupled with subchannel analysis code ATHAS. Based on 5 × 5 full-length rod bundle CHF experimental data independently developed by Nuclear Power Institute of China (NPIC), the applicability research of each model for CHF prediction performance in rod bundle channel is carried out, and the commonness and difference of each model are comparatively studied. The CHF mechanism assumption of superheated liquid layer depletion that is most likely to be applicable for the rod bundle channel is selected and two directions that need to be improved are given. This study provides a reference for the development of CHF mechanistic model in rod bundle channel.

• 한국공작기계학회논문집
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• 제17권6호
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• pp.56-62
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• 2008

An Allium-odorum is difficult material to handle because it is soft and weak mechanically. For bundling work of allium-odorum, we must grip in the bundle shape of unit weight. However it is difficult to grip allium-odorum by hand because the bundle bulk is very big. Especially, in packing work, the bundle shape of allium-odorum package is more important than other vegetables because the sale price depend on the bundle shape. In this paper, we propose bundling mechanism for a rectangular shape, and semi-auto bundling mechanism by a eccentric roller and a triangular link. We carry out mechanical model and analysis respectively using the CATIA V5 and SimDesigner. We have manufactured the prototype of the semi-automatic bundling machine, and got satisfied result through field test. This machine is in the process of commercialization.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2011년도 제41회 하계 정기 학술대회 초록집
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• pp.359-359
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• 2011

This study reports the H2S gas sensing properties of CuO / ZnO nano-hetero structure bundle and the investigation of gas sensing mechanism. The 1-Dimensional ZnO nano-structure was synthesized by hydrothermal method and CuO / ZnO nano-heterostructures were prepared by photo chemical reaction. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) spectra confirmed a well-crystalline ZnO of hexagonal structure. In order to improve the H2S gas sensing properties, simple type of gas sensor was fabricated with ZnO nano-heterostructures, which were prepared by photo-chemical deposition of CuO on the ZnO nanorods bundle. The furnace type gas sensing system was used to characterize sensing properties with diluted H2S gas (50 ppm) balanced air at various operating temperature up to 500$^{\circ}C$. The H2S gas response of ZnO nanorods bundle sensor increased with increasing temperature, which is thought to be due to chemical reaction of nanorods with gas molecules. Through analysis of X-ray photoelectron spectroscopy (XPS), the sensing mechanism of ZnO nanorods bundle sensor was explained by well-known surface reaction between ZnO surface atoms and hydrogen sulfide. However at high sensing temperature, chemical conversion of ZnO nanorods becomes a dominant sensing mechanism in current system. Photo-chemically fabricated CuO/ZnO heteronanostructures show higher gas response and higher current level than ZnO nanorods bundle. The gas sensing mechanism of the heteronanostructure can be explained by the chemical conversion of sensing material through the reaction with H2S gas.

• 한국정보통신학회논문지
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• 제14권2호
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• pp.521-533
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• 2010

OSGi 프레임워크는 원격으로 관리할 수 있는 자바 기반의 서비스 플랫폼으로서 응용프로그램의 생명주기 관리모델과 서비스 레지스트리, 실행 환경을 제공하며 이를 기반으로 다양한 OSGi 계층과 API, 서비스가 정의되어 있다. 번들은 OSGi 프레임워크에서 실행될 수 있는 응용 프로그램으로 번들 저장소를 통해서 배포되고 일반적으로 저장소에 있는 번들은 지정된 웹 페이지를 통해서 접근 가능하다. 하지만 불행하게도 현재의 번들 저장소는 어떠한 종류의 그룹별 접근이나 동적인 번들의 설치와 배포에 대한 기능을 제공하고 있지 않다. 본 논문에서는 효과적인 사용자 그룹의 접근을 제어하는 웹데브(WebDAV) 프로토콜 기반의 OSGi 번들 저장소인 WOBR에 대하여 기술한다. WOBR은 WOBR 저장소와 이를 관리하고 접근하기 위한 관리 번들과 접근 번들로 구성된다. 관리 번들은 WOBR 번들 저장소의 설정과 저장소에 접근하는 사용자 그룹을 관리한다. 접근 번들은 저장소 접근기능과 번들의 검색을 지원한다. 추가적으로, 로컬 환경에 설치된 번들의 생명주기를 관리하는 기능을 제공한다.

• 소성∙가공
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• 제18권4호
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• pp.342-346
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• 2009

Forming characteristics for the bundle extrusion of Cu-Ti bimetal wires are investigated, which can identify the process conditions for weak mechanical bonding at the contact surface during the direct extrusion of a Cu-Ti bimetal wire bundle. Bonding mechanism between Cu and Ti is assumed as a cold pressure welding. Then, the plastic deformation at the contact zone causes mechanical bonding and a new bonding criterion for pressure welding is developed as a function of the principal stretch ratio and normal pressure at the contact surface by analyzing micro local extrusion at the contact zone. The averaged deformation behavior of Cu-Ti bimetal wire is adopted as a constitutive behavior at a material point in the finite element analysis of Cu-Ti wire bundle extrusion. Various process conditions for bundle extrusions are examined. The deformation histories at the three points, near the surface, in the middle and near the center, in the cross section of a bundle are traced and the proposed new bonding criterion is applied to predict whether the mechanical bonding at the Cu-Ti contact surface happens. Finally, a process map for the direct extrusion of Cu-Ti bimetal wire bundle is proposed.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제10권3호
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• pp.259-272
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• 2004

본 논문에서는 안전한 OSGi 서비스 플랫폼 환경의 구축에 필요한 새로운 보안 아키텍처를 제시한다. 이 보안 아키텍처에는 1) 사용자 인증 메커니즘, 2) 번들 인증 메커니즘, 3) 키 공유 메커니즘, 4) 권한부여 메커니즘이 포함된다. 사용자 인중 메커니즘에서는 안전하고 편리한 사용자 인증을 위해 SSO (single sign-on) 기능을 제공한다. 번들 인증 메커니즘에서는 효율적인 서비스 번들의 인증을 위해 PKI 기반의 전자서명과 대칭키 기반의 MAC을 함께 이용한다. 서비스 게이트웨이의 부트스트래핑 단계에서 수행되는 키 공유 메커니즘은 인증 메커니즘에서 사용되는 비밀키를 안전하게 공유할 수 있는 방법을 제공한다. 마지막으로 권한부여 메커니즘을 통해 서비스 번들의 제공자와 게이트웨이 오퍼레이터가 분산된 보안 정책을 수립할 수 있는 방안을 제시한다. 본 논문은 기존의 OSGi 스펙에서 추상적으로 명세한 보안 기능을 실제로 OSGi 환경에서 적용할 때 필요한 요구사항을 살펴보고 구체적인 보안 아키텍처의 설계와 구현을 통해 해결 방안을 기술한 점에서 중요한 의미를 갖는다.