광촉매용 Ti 양극산화피막의 미세구조와 특성분석

장재명,주은균,지충수,오한준,이종호 한국표면공학회 2001 한국표면공학회 학술발표회 초록집 Vol.2001 No.-

UML을 이용한 화상 대화 시스템의 설계

장재명,김윤호,Jang Jae-Myoung,Kim Yun-Ho 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.3

현재 소프트웨어 개발의 주요한 패러다임인 객체지향 설계를 많은 시스템들이 채택하고 있으나, 화상 대화를 대상으로 한 연구들에서 본격적인 객체지향 설계의 적용은 그리 많지 않은 실정이다. 따라서 본 논문에서는 화상 대화 시스템에 대한 객체지향 설계를 위한 UML을 이용한 체계적인 아키텍처의 설계를 제시한다. 화상 대화 시스템에 대하여 체계적인 기능/비기능적 요구사항을 포착하고, '4+1 View Model'을 적용하여 객체지향 설계를 함으로써, 컴포넌트들은 재사용성을 담보하며, 이후 필요에 따라 컴포넌트들을 추가하여 시스템을 확장하는 것이 가능하다. 또한, 본 논문에서 설계한 화상 대화 애플리케이션의 컴포넌트들은 다른 여러 화상 대화 시스템에 활용 가능하며, 웹 환경에서의 서비스로도 확장될 것으로 기대된다. Recently, the object-oriented design is the major paradigm for software development. Most systems are following this paradigm, but the past studies for a video conversation domain were not based on full-scale object-oriented design. Thus, this paper presents an systematical architecture design using UML for a video conversation system that is well-known and has high rate of usefulness. It analysis a video conversation system that has much demand of service as systematical functional/non-functional requirements, and the object-oriented design applying '4+1 View Model' guarantees the reusability of a component and makes it possible to extend a system by adding components as needed. Consequently, it is expected that the components of video conversation system designed by this paper will be useful the other video conversation systems and will be expanded to web environment.

高抵抗 半導體의 케리어 輸送現象에 관한 硏究

張在明,河聖哲 東國大學校 1988 論文集 Vol.27 No.-

In this paper, Carrier transport phenomena in High-resistivity Semiconductor have been investigated both experimentally and theoretical. The latter studies on electrical conduction mechanism of High-resistivity semiconductors have been made in two case, (1) Semi-insullating semiconductor contained a recombinations center which is partially accupied by electrons in thermal eqillibrium and (2) Relaxation case semiconductor, the experimental investigations for the crucial check of the theory presented here were of the Au-doped Silicon and Cr-doped GaAs p^+-i-n^+, the I-V characteristics of Au-doped Silicon diodes showed consistency with the main theoretical results, especially the occurrence and disappearance of CCNR were found to be strongly dependent on the concentration and caputure cross section of the recombination center.

Ti양극산화피막제작에 미치는 전해조건의 영향

장재명,주은균,지충수,오한준,이종호 한국표면공학회 2001 한국표면공학회 학술발표회 초록집 Vol.2001 No.-

광촉매용 TiO₂ 산화피막의 제조에 있어서 Pore의 발생기구 분석

장재명,조수행,지충수,오한준,이종호 한국표면공학회 2001 한국표면공학회 학술발표회 초록집 Vol.2001 No.-

폴리에틸렌膜의 高電界導電現象에 관한 理論的 및 實驗的 考察

張在明,閔南基 동국대학교 1980 論文集 Vol.19 No.-

The conduction current in polyethylene film has been measured at high electric field and the conduction mechanism was discussed on the base of various theories presented so far. The current measured increased approximately with applied voltage according to the Child's law only in the limited voltage rang, but rapid upward departures from Child's law was observed at higher voltage. A modified form of Murgatroyd conduction theory which is a combination of the Poole-Frenkel and the space-charge-limited theories is proposed as high field conduction mechanism of polyethylene film. The current density is expressed as a fuction of voltage as follows. J=(2ε_rε_0μθ_0)/β (V^3/2)/(L^5/2) exp{β(V/L)^½} The results calculated from this model agree closely with expremental data in the wide voltage range.

광촉매용 Ti 양극산화 피막의 조직 및 성장거동

장재명,오한준,이종호,조수행,지충수,Jang, Jae-Myeong,Oh, Han-Jun,Lee, Jong-Ho,Cho, Su-Haeng,Chi, Chung-Su 한국재료학회 2002 한국재료학회지 Vol.12 No.5

The microstructure and growth behaviors of anodic oxide layers on titanium were investigated. $TiO_2$ oxide films were prepared by anodizing at constant voltages of 180 and 200V in sulfuric acid electrolyte. The anodic $TiO_2$ layer formed at 200V showed a cell structure with more irregular pore shapes around the interface between the anodic oxide layer and the substrate titanium compared with that formed at 180V. Irregular shape of pores at the initial stage of anodization seemed to be attributed to spark discharge phenomena which heavily occurred during increasing voltages. The thickness of the anodic oxide film increased linearly at a rate of $1.9{\times}10^{ -1}\mu\textrm{m}$/min. The oxide layers formed at 180 and 200V were composed mainly of anatase structure, and the anodizing process could be suggested as one of fabrication methods of photocatalytic $TiO_2$.

국내 건설 폐기물 활용 현황 및 활성화에 관한 연구

장재명,최희복,강경인,Jang, Jae-Moung,Choi, Hee-Bok,Kang, Kyung-In 한국건축시공학회 2003 한국건축시공학회지 Vol.3 No.1

Recently, the amount of the construction and demolition wastes has rapidly increased due to increasing construction projects. In the past, most of the construction and demolition wastes were buried in the ground of thrown away. Illegally, without any treatment, so various harmful environmental pollution problems were occurred. In this study, the domestic data on the amount of the construction and demolition wastes and the disposal methods were collection and analysed. Specially, the recycling and management systems of the construction and asphalt concrete wastes were studied. A new technology and necessary policy for recycling were suggested. In general, the industrial wastes were produced in the particular place, and the amount and the characteristics of the wastes able to be estimated by the studies on the treatment technology. And the investment of the facilities for the industrial wastes have been made continuously. But little attention has been relatively given to the treatment technology. And system for the construction and demolition wastes for the political support and facilitation on the proper treatment and the recycling, the necessary of information exchange system and the manifest system for treatment of waste on commission were recommended, and also devised methods to develope and support the recycling industry. In the future, the subject of study is going to carry out analysis of economic and market in making products.

Chemical State and Ultra-Fine Structure Analysis of Biocompatible TiO₂ Nanotube-Type Oxide Film Formed on Titanium Substrate

장재명,박수정,최갑송,권태엽,김교한 대한금속·재료학회 2008 METALS AND MATERIALS International Vol.14 No.4

TiO₂ nanotube-type oxide film on Ti substrate has been fabricated using an electrochemical method, and the chemical bonding state, ultra-fine structures, and surface characteristics of the TiO₂ nanotube layer have been investigated. The formation and growth of a self-organized nanotube layer can be achieved directly by anodization in NH4-containing electrolytes. The diameter, length, and wall thickness of the nanotube are significantly affected by anodizing conditions such as applied voltage, current density, and anodizing time. The length limiting factor of nanotube growth was found to be the diffusion of ionic species in the electrolyte. XRD investigations revealed that annealed nanotubes have anatase and rutile structure, and some Ti-peaks from the Ti substrate were observed. From the compositional analysis of TiO₂ nanotubes layer using Energy Dispersive Spectroscopy (EDS), Ti, O, and P elements were obtained in the wall nanotube layer. For incorporated P-containing in the TiO₂ nanotube layer, various chemical states were presented, which were revealed mostly in the forms of H₂PO₄, HPO₄²-, and PO₄³-. TiO₂ nanotube-type oxide film on Ti substrate has been fabricated using an electrochemical method, and the chemical bonding state, ultra-fine structures, and surface characteristics of the TiO₂ nanotube layer have been investigated. The formation and growth of a self-organized nanotube layer can be achieved directly by anodization in NH4-containing electrolytes. The diameter, length, and wall thickness of the nanotube are significantly affected by anodizing conditions such as applied voltage, current density, and anodizing time. The length limiting factor of nanotube growth was found to be the diffusion of ionic species in the electrolyte. XRD investigations revealed that annealed nanotubes have anatase and rutile structure, and some Ti-peaks from the Ti substrate were observed. From the compositional analysis of TiO₂ nanotubes layer using Energy Dispersive Spectroscopy (EDS), Ti, O, and P elements were obtained in the wall nanotube layer. For incorporated P-containing in the TiO₂ nanotube layer, various chemical states were presented, which were revealed mostly in the forms of H₂PO₄, HPO₄²-, and PO₄³-.

금속-절연체-금속다이오드의 전기적 특성에 관한 연구

장재명,백수현,민남기 대한전기학회 1982 전기의 세계 Vol.31 No.3

Metal-Oxide-Metal thin film diodes have been fabricated on the glass substrates by conventional vacuum evaporation method, and the electrical properties, primarily current-voltage characteristics of diodes, have been discussed in the light of various conduction theories presented so far. The experimental results were ploted in the different figures according to the assumed theory, and the characteristic coefficients peculior to these theories were estimated from the function dependence of current (I) upon voltage (V), temperature (T) and oxide film thickness (d).