ZnO micro/nanocrystals with different morphologies were synthesized by thermal evaporation of various zinc source materials in an air atmosphere. Zinc acetate, zinc carbonate and zinc iodide were used as the source materials. No catalysts or substrates were used in the synthesis of the ZnO crystals. The scanning electron microscope(SEM) image showed that the morphology of ZnO crystals was strongly dependent on the source materials, which suggests that source material is one of the key factors in controlling the morphology of the obtained ZnO crystals. Tetrapods, nanogranular shaped crystals, spherical particles and crayon-shaped crystals were obtained using different source materials. The X-ray diffraction(XRD) pattern revealed that the all the ZnO crystals had hexagonal wurtzite crystalline structures. An ultraviolet emission was observed in the cathodoluminescence spectrum of the ZnO crystals prepared via thermal evaporation of Zn powder. However, a strong green emission centered at around 500 nm was observed in the cathodoluminescence spectra of the ZnO crystals prepared using zinc salts as the source materials.

The MLCC electronic materials are used to make many industrial parts, for instance, such as smart phone, radio, LCD TV and so on. The screen ways and the rotor ways are known as methods that form electrode in MLCC. In these days, rotor ways have been frequently utilized because of its stability of quality. In this study, mixing characteristics for the inside of barrel of planetary mixer driver were investigated by numerical analysis using k-ε model of unsteady state, including effects for rotation and revolution. As the results, it showed that the flow of radius direction was mixed with regular pattern depending on time, however, the flow of longitudinal direction was mixed with same pattern regardless of time.

Recent high efficiency electronic devices have been found to have heat emission problems. As for LEDs, an excessive increase in the device temperature causes a drop of the luminous efficiency and circuit lifetime. Therefore, heat release in the limited space of such electronic parts is very important. This is a study of the possibility of using a coating of carbon materials as a solution for the thermal emission problem of electronic devices. Powdered carbon materials, cokes, carbon blacks, amorphous graphite, and natural flakes were coated with an organic binder on an aluminum sheet and the subsequent thermal emissivity was measured with an FT-IR spectrometer and was found to be in the range of 5~20 μm at 50˚C. The emissivity of the carbon materials coated on the aluminum sheet was shown to be over 0.8 and varied according to carbon type. The maximum thermal emissivity on the carbon black coated-aluminum surface was shown to be 0.877. The emissivity of the anodized aluminum sheets that were used as heat releasing materials of the electronic parts was reported to be in the range of 0.7~0.8. Therefore, the use of a coating of carbon material can be a potential solution that facillitates heat dissipation for electronic parts.

Silver coated copper composite powders were prepared by electroless plating method by controlling the activation and deposition process variables such as feeding rate of silver ions solution, concentration of reductant and molar ratio of activation solution at room temperature. The characteristics of the product were verified by using a scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic absorption (A.A.). It is noted that completely cleansing the copper oxide layers and protecting the copper particles surface from hydrolysis were important to obtain high quality Ag-Cu composite powders. The optimum conditions of Ag-Cu composite powder synthesis were molar ratio 4, concentration of reductant 15g/l and feeding rate of silver ions solution 2 ml/min.

Recently, all kind of 21C-typed electronic goods show the tendency of hightechnology and digital convergence rapidly. Also, failure mechanism which differs from original goods concept presents. Today, failure mechanism which differs from one that was happened by restricted harmful environment material before adapted the raw of environment material is changing the paradigm of reliability engineering. Thus, when applied the environment matter of original and secondary material at the electronic goods were removed, reliability assessment method and prediction stay into low level. This study suggests as solution to overcome these phenomenon. The study on the management method of environmental restriction substances which is recognized as important element in the reliability assessment about environment material of electronic goods and the study on reliability assessment method of PWB without environment material are progressed.

Recently, all kind of 21C-typed electronic goods show the tendency of hightechnology and digital convergence rapidly. Also, failure mechanism which differs from original goods concept presents. Today, failure mechanism which differs from one that was happened by restricted harmful environment material before adapted the raw of environment material is changing the paradigm of reliability engineering. Thus, when applied the environment matter of original and secondary material at the electronic goods were removed, reliability assessment method and prediction stay into low level. This study suggests as solution to overcome these phenomenon. The study on the management method of environmental restriction substances which is recognized as important element in the reliability assessment about environment material of electronic goods and the study on reliability assessment method of PWB without environment material are progressed.

As the interception of communications infringe the close part of the privacy and the degree of the infringement is very serious, the law of protecting the secrecy of communications limits the group of crimes which can be the cause of the interception. As the result, the purpose of the limitation could not be achieved if the materials of evidence would not be restricted to use in investigation and prosecution only for the crimes within the limited group. We could admit the provision §12(1) of the law of protecting the secrecy of communications reasonable, which restrict the scope of the use of the evidence obtained by the interception of the communications. But the indentification materials of electronic communications includes only the names, the telephone numbers of the parties of the communication, the times fo the communication. It does not include the contents of the communications. The degree of the infringement could be said relatively minor and the law does not limit the scope of the crime which could be the cause of the request for the identification materials. Therefore, there would be no reason to limit the scope of the use of the evidence obtained by the request issued by the court. Nevertheless, the provision §13-5 of the law of protecting the secrecy of communications provides that the provision §12(1) which restrict the use of the evidence obtained by the interception apply correspondingly to the indentification materials of electronic communications. From the point of view of legislation, the provision §13-5 could be said inappropriate and should be eliminated in the future.

최근 유럽은 2015년 순환경제사회로의 정책 기조 발표에 따라 자원효율성 지표 개발 등 관련 활동을 추진하고 있으며, 국내에서도 자원순환기본법이 2018년부터 시행될 예정이다. 또한 기존의 전자제품등자원순환법에서는 재활용 소재 사용에 따른 재활용 분담금 감면 정책이 시행되는 등 폐기물 최소화 및 순환자원 확보를 위한 정책 및 제도가 확대되고 있다. 이에, 국내외 자원순환 관련 정책 및 제도에 사전 대응하기 위해 국내 기업의 재활용 플라스틱 사용 현황을 파악하고, 재활용 소재 활성화 방안을 마련하고자 한다. 본 연구에서는 전기전자제품 완제품 제조업체를 대상으로 설계단계의 소재선정에 대한 일반현황, 재활용 소재 사용 현황, 재활용 플라스틱 사용 활성화 방안, 재활용 플라스틱 표준화 방안에 대한 설문조사를 진행하였다. 응답 기업의 주요 생산제품은 소형기기, 중형기기, 대형기기, 통신사무기기 순이며, 제품에 사용되는 플라스틱으로는 ABS, PVC, EP 등이 있다. 또한 응답 기업의 41%는 제품 설계단계에서 소재선정 및 검토의 주목적으로 성능 및 품질향상, 바이어 및 법적요구사항 만족으로 답변하였으며, 86%의 기업은 재활용 플라스틱 사용에 대해 현재 적용하고 있거나 확대 예정이라고 응답하였다. 응답 기업의 95%는 재활용 플라스틱 사용 시 재활용 분담금 감면 제도에 대해 인지하고 있으나 감면인정금액이 적어 활용하기 어렵다고 응답하였다. 이에, 재활용 플라스틱 활성화를 위해서는 금융･조세지원의 제도적 보완뿐만 아니라 재활용 소재 기술개발 지원, 국가표준 제･개정, 재활용 사용비율 의무화 도입 등의 방안이 필요한 것으로 나타났다. 특히, 응답 기업의 100%가 재활용 플라스틱 함유율 산정 방법 등 재활용 플라스틱 관련 표준 제정의 필요성을 인지한바, 표준 제정이 재활용 플라스틱의 보급‧확산에 큰 영향을 미칠 것으로 기대된다.