Earticle

본 연구는 오프셋 인쇄에서 UV 인쇄와 LED-UV 인쇄의 품질을 비교·분석하였다. 그 결과 인쇄물의 색 농도 값은 백상지에 비하여 아트지와 유포지에서 상대적으로 높 게 나타내었다. 특히 UV 인쇄가 LED-UV 인쇄보다 색 농도 값이 상대적으로 높게 나 타났다. 트래핑 특성으로 재현되는 R, G, B의 경우에는 색 농돗값이 ISO12674-2 규격 보다 높게 나타났다. 또한 트래핑은 UV 인쇄가 중첩된 색 농돗값 0.1정도의 근소한 차 이로 LED-UV 인쇄보다 높은 것으로 확인되었다. 그레이 밸런스에서는 CMY로 재현된 그레이의 오차 범위 평균이 타깃 오차 범위인 색차(ΔE* 00) 2를 넘지 않았다. 망점 확대의 경우 UV 인쇄와 LED-UV 인쇄에서 아트지 와 유포지가 상대적으로 잉크의 흡수와 번짐 현상이 적은 양호한 결과를 나타내었다. 특히 망점 확대율의 경우 LED-UV 인쇄가 UV 인쇄보다 평균 1.8% 정도 낮게 나타났 다. 색차의 경우 M 잉크를 제외한 모든 잉크에서 백상지와 아트지는 5.0 이내, 유포지 는 5.0을 벗어나는 결과를 보였다. 또한 전체적인 LED-UV 인쇄가 UV 인쇄보다 색차 가 적어 양호한 결과를 나타내었다.

This study compared the quality of UV and LED-UV printing in offset printing. As a result, the color density value of printed matter was relatively higher on art paper and artifical paper than on wood-free paper. In particular, UV printing showed relatively higher color density values than LED-UV printing. In the case of R, G, and B, which are reproduced as overprinting characteristics, the color density values were higher than the ISO12647-2. It was also confirmed that the trapping was higher than the LED-UV printing with a slight difference of about 0.1 in the overprinting color density value of the UV printing. In gray balance, the average error range of gray reproduced by CMY did not exceed the target error range of ΔE* 002 . In the case of dot gain, art paper and artifical paper showed good results with relatively little ink absorption and smearing in UV and LED-UV printing. In particular, in the case of dot gain rate, LED-UV printing showed an average of 1.8% lower than UV printing. In the case of color difference, wood-free paper and art paper showed results within 5.0 and artifical paper exceeded 5.0 in all inks except for M ink. In addition, overall LED-UV printing showed good results with less color difference than UV printing.

본 연구는 국내에서 시판 중인 친환경 잉크에 대한 인쇄 품질 및 인쇄 적성에 관한 기본적인 데이터를 확보하기 위하여 실험하였다. 인쇄물의 품질의 평가는 인쇄물의 색상 농도, 광택, 뒤비 침, 트래핑(trapping), 망점 확대 등이었다. 본 실험에서 확인한 결과 국내에서 사용 중인 매엽용 인쇄 잉크의 색상 농도가 ISO 12647-2 규격과 유사하게 나타났다. 트래핑 효율도 양호한 결과를 나타내었으며, 망점 확대의 경우에도 K 잉크를 제외한 나머지의 모든 색상에서 허용 오차를 넘지 않았다. 따라서 본 실험을 통해 얻 은 기본 데이터를 근거로 앞으로 개발되거나 개발 예정인 친환경 인쇄 잉크의 인쇄물 색상 품 질 기준으로의 접근이 좀 더 용이할 수 있도록 지속적인 연구가 수행되어야 할 것이다.

This study was experiment to obtain basic data on print quality and printability of eco-friendly inks marketed in Korea. The evaluation of the printed quality has been carried out such as the color density of the printing, print-through, trapping, gloss, dot gain of halftone. As a result of the this experiment, the printed color density was similar to the color density range defined in ISO 12647-2. Trapping efficiency also showed good results. And, in the case of halftone dot gain were obtained. satisfactory results in all color inks except black ink. Therefore, we will continue to measure and manage the results obtained in this study and want to help improve the quality of environmentally friendly inks to be developed in the future.

In Graphic art reproduction process it is important to realize that which set of inks and their densities (film thickness) and which set of halftone positive should be aimed at. in order to meet the demand for good color reproduction. There have been various studies to calculation the color reproduction of the graphic arts. however. these study were based on the assumed characteristics of the materials. In this study the relationship between wet-trapping (wet on wet-printing) and increases of ink layer and printing sequence are examined.

This study investigated the impact of varying NaCl concentrations on the gel properties and in vitro digestive behavior of pork sausage models. Meat batters formulated with pork shoulders were prepared with NaCl concentrations of 1.0% , 1.5%, and 2.0% (w/w). NaCl 2.0% yielded the lowest actomyosin content (33.46%) and highest total protein solubility (0.61 g/ g) in the batter (p < 0.05), followed by 1.5% (34.72% and 0.56 g/g, respectively) and 1.0% (42.19% and 0.55 g/g, respectively). Subsequently, pork sausage models were produced by placing the batters in stainless-steel cans, vacuum-packing, and heating. The sausages prepared with NaCl 2.0% exhibited the lowest cooking loss (2.8%, p < 0.05), with corresponding the highest hardness and cohesiveness values of 102.47 N and 0.44, respectively, among the treatments (p < 0.05). In vitro gastric digestion revealed that lower NaCl concentrations (1.0% and 1.5%) led to a higher release of α-amino groups (0.29 and 0.31 mM/g, respectively) than NaCl 2.0% (0.24 mM/g, p < 0.05) with the larger and more aggregated gel particles in the fluorescence microscopic images. However, after the small intestinal digestion, NaCl 1.0% retained the highest release of α-amino groups (2.19 mM/g, p < 0.05), whereas NaCl 1.5% had the lowest value (1.96 mM/g, p < 0.05). These findings illustrate that the variations in the physicochemical and gel properties of pork sausages depending on the NaCl levels result in the different in vitro protein digestive behaviors.

기후변화에 따른 집중호우의 빈발로 산림유역의 토석류 발생 위험이 증가하는 상황에서, 사방댐의 토석 류 포착 효과를 정량적으로 검토하여 설계 및 정책적 시사점을 도출하는 것을 목적으로 한다. 우리나라와 일본의 사방댐을 대상으로 규모에 따른 토석류의 포착특성과 저사량, 강우특성과의 관계를 비교·분석하 였다. 일본의 토석류 포착량은 대규모 사방댐(≥15m)에서 가장 많았던 반면, 단위유역면적당 포착량은 중규모 사방댐(≥5, <15m)에서 가장 많았고, 중·소규모 사방댐 중심의 우리나라가 일본에 비해 사방댐의 토석류 포착효율이 높게 나타났다. 한편, 토석류 포착특성은 주로 연속강우량에 영향을 받고 있었다. 단, 이 연구는 표본 수의 제한과 일부 데이터의 누락으로 현장조사를 통한 보완 및 표준화된 데이터 수집이 필요하다. 중규모 사방댐의 설계 및 시공을 유역 맞게 최적화하면 피해 저감에 효과적이며, 표준화된 국가 데이터베이스 구축은 장기적 검증이 가능하고 보다 정밀한 전략을 수립할 수 있다.

This study aims to derive design and policy implications by quantitatively verifying the disaster-reduction effects of erosion-control dams, as more frequent heavy rainfall under climate change increases the risk of debris flows in forested catchments. Trapping characteristics of debris flow materials, sediment storage capacity, and rainfall data classified by dam scale were analyzed using datasets from South Korea and Japan. In Japan, large-scale dams (≥15 m) had the largest average trapped volume, while medium-scale dams (≥5 m, <15 m) showed the largest average trapped volume per catchment area. Trapping efficiency was highest in South Korea, where small- and medium-scale dams predominate. Continuous rainfall exerted a stronger influence on trapping characteristics than peak rainfall intensity. The limited samples underscore the need for additional field surveys and standardized data collection. Optimizing the design and construction of medium-scale erosion-control dams for catchment characteristics can improve disaster reduction. A standardized national database would enable long-term verification and support more precise strategies.

The long-tailed goral (Naemorhedus caudatus) has slowly recolonized habitats in South Korea. Because it is necessary to know the status of groups in recolonized areas, we determined detection frequencies and group sizes using camera trapping, a non-invasive monitoring method. In Uljin, a far southern goral habitat in South Korea, we used a Moultrie 5.0 camera and mineral block as bait during the breeding season in BaekAm Mountain (148 days, 18 May to 11 October) and Geumjong Mountain (63 days, 18 May to 18 July) in 2010. Totally, 155 images were captured in BaekAm Mountain, whereas four images were captured in Geumjong Mountain. The species was most frequently detected at sunrise (05:00-08:00) and sunset (18:00-20:00). Through population structure evaluation, we identified at least 11 individuals, including one solitary mature male, four females, four kids, and two solitary subadults in BaekAm Mountain. However, in Geumjong Mountain, we identified only two individuals (female with kid). Monitoring efficiency in the recolonized area differed depending on population density and habitat conditions. Because we could evaluate the population structure, and behavioral patterns in the study sites, monitoring using camera traps could be applied for the recolonized habitats in South Korea.

Camera trapping (CT) is one of the methods to survey wildlife. This method is used for monitoring nocturnal mammals, which cannot be seen directly, and for the use of habitats and identification of terrestrial mammals. However, there are many identification errors in results of data analysis because of no criteria in analysis of camera trapping data and lack of researcher's experience. Our purpose of this study is to make an identification index. This study used 6,746 pictures, which wildlife is included, of 27,061 pictures taken from 21 cameras installed in the Jangsudae, Seoraksan National Park during the period of May 2016 to July 2017. After production of index, the error rate was derived through the verification of expert who have experience above 5 years in the field of wildlife ecology. After the index applied, total error rate was 1.2% in detail, 2.1% in water deer and 1.8% in Roe deer. To verify usefulness of identification index, we analysis another CT data which include four species of Roe deer (Capreolus pygargus), Water deer (Hydropotes inermis), Badger (Meles meles) and Raccoon dog (Nyctereutes procyonoides which are most confusing species to identify. In additional analysis, we used 3,549 photos which wildlife is included, of 93,287 photos from 75 cameras installed in Osaek, Seoraksan National Park from November 2015 to July 2016. In the case of further analysis, average error rate was 0.3% in 4 species, and the error rates were 0% in Water deer, 1.2% in Roe deer, 0% in Raccoon dog, and 0.6% in Badger. Identification idex what we made will contribute to the study of mammals using camera trapping.

We analyzed activity patterns of wild boars in Wangpicheon Ecological Landscape Protected Area using trail-camera. According to the data analyses, total 338 valid pictures were collected. Monthly activity analysis of wild boars showed that the wild boar pictures were collected most frequently in August whose 93 pictures were taken. In the analyses of seasons, the wild boar pictures were most frequently taken in summer with 170 pictures of wild boar than the other seasons. According to daily activity of wild boars, pictures of wild boars were frequently taken at both sunrise and sunset time zone, with more pictures taken at sunset than sunset.

I investigated activity pattern of the long-tailed gorals (Naemorhedus caudatus) in Osaek area in Seoraksan National Park using the camera trapping which has been widely used for survey and monitoring of wild mammals. Analysis of the activity patterns of long-tailed gorals showed that the largest number of goral photos were taken at 07:00∼08:00 am near sunrise and 18:00∼19:00 pm near sunset, and the smallest number of goral photos at 12:00∼13:00 pm. The analyzed pictures consist of 1015 moving pictures, 164 feeding pictures, 98 resting pictures. The moving pictures were taken at sunrise and sunset, and feeding or resting pictures were taken between 09:00 and 16:00 and between 21:00 and 05:00. Appearance pattern of individuals was different every month, and the appearance pattern in ridge, slope, and shelter was also different from each other. It indicates that habitat usage pattern of gorals is different according to months and seasons.

이 연구에서는 CCS(Carbon Capture and Storage)를 위해 대수층에 주입된 CO2가 안정적으로 저장될 수 있도록 주입 시나리오에 대한 트랩 메커니즘을 분석하였다. CO2 연속주입, cyclic CO2 주입, CO2와 물을 교대로 주입하는 WAG(Water-Alternating Gas) 주입법을 대상 시나리오로 선정하였다. 사이클 수는 2에서 20까지 변경하고, cyclic CO2 주입법의 휴식기간(shut-in period)과 WAG의물 주입기간을 1, 3, 6개월로 변경하여 시뮬레이션을 수행하였으며, CO2 주입 후와 180년 모니터링후의 잔류트랩, 용해트랩 및 구조트랩을 분석하였다. 시뮬레이션 수행결과, CO2 연속주입 대비cyclic CO2 주입법은 잔류트랩과 용해트랩을 개선하지 못해 CO2의 안정적 저장에 기여하지 못하였다. 반면, WAG는 CO2의 잔류트랩과 용해트랩을 크게 증가시키고 구조트랩을 작게하여 이산화탄소 지중저장의 안정성 확보에 기여하였다.

This study analyzed trapping mechanisms for injection scenarios that can reliably store CO2 in aquifers for carbon capture and storage (CCS). The injection scenarios included continuous CO2 injection (CGI), cyclic CO2 injection, and water-alternating gas (WAG) injection, in which CO2 and water are injected alternately. The number of cycles varied from 2 to 20, with times of 1, 3, and 6 months for the shut-in period of cyclic injection and the water injection period of WAG. The residual, dissolved, and structure trapping were analyzed after CO2 injection and 180 years of monitoring. The simulation results showed that cyclic CO2 injection did not improve the residual and dissolved trapping compared to CGI and did not contribute to the stable storage of CO2. On the other hand, WAG significantly increased the residual and dissolved trapping of CO2 and decreased the structure trapping, contributing to CCS stability.

이 연구는 gene-trap construct를 가지고 있는 배양세포로부터 trap gene을 확인하고 클로닝한 다음 이러한 세포를 이용하여 복제 지브라물고기를 만들기 위해 수행되어졌다. 본 연구에서 gene-trap과 연관된 복제 지브라물고기가 성공적으로 만들어졌다. 본 실험에서 두 종류의 백터(SA/GFP-TP와 Neo-TP)가 사용되었다. 이들 벡터에 의해 전이된 모든 종류의 세포는 항생제에 의해 선별을 하여 분석에 이용하였다. SA/GFP-TP에 의해 전이된 세포의 경우, 단일세포상에서 GFP 발현도가 낮아 본 연구에서 동물복제에 사용되지 않았으며, Neo-TP에 의해 전이된 세포주가 복제실험에 이용되었다. Neo-TP 세포에 의한 복제실험 결과, 총 1179개의 핵치환 난으로부터 44(3.7%) 개의 배자가 포배기에 도달하였으며, 8(0.8%) 개의 배자가 부화시기에 이르렀다. 그리고 3마리는 성숙단계에 이르렀으며, 이중 1마리에서 정상적으로 gene-trap 전이가 이루어짐을 Southern blot 분석을 통해 확인되었다.

This involves identifying and cloning trapped genes from cultured cells carrying the gene-trap constructs and generating cloned zebrafish using these cells for functional study. Gene-trapping studies in gene-trapped cells were carried out in initial and cloned zebrafish carrying gene-trap events were successfully produced based on the nuclear transplantation technique. Two kind of retroviral gene-trap constructs were adopted. The first one(SA/GFP-TP), constructed in my laboratory, carries a GFP reporter gene containing a splicing acceptor and an internal neo gene. The second one(Neo-TP), obtained from Dr. Hicks (Hicks et al., 1997), contains a promoter-less neo gene located in the LTR sequence of a retroviral vector. The infected cells were subjected to drug selection(neomycin treatment) because the two constructs carry the neomycin resistant gene. All those cells survived the neomycin treatment should carry the proviral insertions. For Neo-TP, Isolated DNA from the neomycin-resistant fibroblast cells infected by Neo-TP, was digested with EcoR1 restriction enzyme and transformed into bacteria after ligation. This procedure led to the isolation of seven clones carrying flanking cellular DNA with a typical retroviral integration signature sequence. These clones contained genomic DNA ranging from 1kb to 7kb and sequences of 300-600 bp were obtained from each of the rescued plasmids. Database searching showed that all of them share high homology to zebrafish sequences. For fish cloning using tagged cells, initially, nucleus donors directly selected from a mixture of cells(Neo-TP cells) were used. A total of 44 embryos(3.7%) out of 1179 transplants were reached blastula stage; 8 of these embryos(0.8%) hatched and 3(0.3%) of them survived to adulthood. One out of three lived cloned zebrafish has an amplified fragment and was labeled with 32P.

이 연구에서는 유목 및 토석의 포착에 대한 바닥스크린의 효과를 파악하고, 동시에 바닥스크린의 적정 순간격을 도출하기 위한 목적으로, 모형실험을 통해 바닥스크린의 순간격을 3mm(계상재료의 평균입경), 9mm(계상재료의 최대입경) 및 15mm로 설정하여 공급재료의 포착률을 정량적으로 해석하였다. 그 결과, 공급재료가 바닥스크린에 포착 하게 되면 유수와 이동물질이 순간적으로 분리하여 그 에너지를 감소됨으로써 유목 및 토석이 포착되는 특성이 확인되었다. 이에 따라, 무시설시 유수에 의하여 전량 유출 되는 유목이 바닥스크린의 설치로 인해 부재의 순간격에 관계없이 90%이상의 높은 포착률이 나타났다. 그러나 유목과 토석을 함께 공급한 경우의 유목은 자체의 비중이 낮아 바닥스크린에 먼저 도달하면서 후속되는 토석의 충격력에 의해 상대적으로 먼 구간까지 이동되거나 이탈함으로써 결국 포착량은 감소하였다. 한편, 유목과 함께 공급된 토석은 공급재료의 평균입경에 해당하는 바닥스크린의 순간격이 3mm인 경우에 가장 높은 포착률을 나타냈으며, 이는 기존의 투과형 사방댐 부재간격이 계상재료의 최대 입경으로 한다는 보고와 차별되는 결과를 보였다. 또한 토석의 포착률은 전체 공급량의 37.3%에 불과하였으며, 이는 바닥스크린 상에서의 체류과정에서 유목과 토석의 상호 작용에 의해 후속류의 흐름이 바뀌면서 다량의 토석이 측면부로 이탈하였기 때문으로 사료된다.

The objective of this study were to examine function of flat-board debris-flow breaker (hereafter FDB), which is one of new methods for reducing damages by sediment-related disasters in residential piedmont areas, and to derive an optimal slit aperture of FDB for catching driftwood and debris flows. We dealt with the cases of which (i) the FDB was not installed, and (ii) the FDB with 3-mm wide slit aperture (i.e., equal to the mean grain-size of bed-materials), (iii) the FDB with 9-mm wide slit aperture (i.e., similar with those maximum grain-size) and (iv) the FDB with 15-mm wide slit aperture were installed; and then quantitatively examined storages of bed-materials through the experimental flume. The results showed that driftwood and debris flows (including driftwood) were momentarily divided from water body by the FDB, and thus the kinetic energy of those materials was rapidly reduced, thereby inducing their storage. We found that 90% of the driftwood supplied was trapped on the upper surface of FDB on experimental flume with FDB, regardless of slit aperture size, whereas the whole driftwood was exported on experimental flume without FDB. In addition, the driftwood belonging to debris flows were occupied fore-end of debris flows due to its own lower specific gravity, and so more early stored on the surface of FDB, compared to large boulders composing of main body of debris flows. However, the driftwood was broken away from the surface of FDB due to impact of following the boulders, resuling in its lower storage. Meanwhile, the optimum slit aperture for trapping debris flows, supplied with driftwood in this experiment, was 3 mm, unlike that other transmission-type check dams having the slit aperture similar to the maximum grain-size of bed-materials. However, the volume of the materials stored was at best only 37% of total bed-material’s volume. The reason should be because of interaction between driftwood and boulders stored on the upper surface of FDB, and then the flow direction of the materials arriving at the heels of the pile was changed to both sides of FDB.

한국 사회에서 갑신정변의 주역 김옥균과 을미사변의 피해자 민비는, 일본과의 표면적 관 계성을 잣대로 ‘친일’과 ‘반일’의 전형으로 여겨져 왔다. ‘반일’은 곧 애국이요 ‘친일’은 곧 매국 이라는 이분법적 논리 아래, 김옥균과 민비에 대해서는 ‘매국’과 ‘애국’의 낙인이 교차되어 온 면이 있다. 본고는 이와 같은 이분법적인 인식의 틀이 사실과 상당 부분 맞지 않다는 문제의 식에서 이 두 인물의 삶과 죽음이 갖는 상호 연관 관계와 이들의 죽음에 관여한 일본의 행동 방식을 분석해 보았다. 연구의 결과, 이들의 삶과 죽음은 일본을 매개로 인과적인 순환 관계 속에 있었음을 확인하였고, 이들에 대한 후대의 평가를 전도되게 만든 것은 역사의 결과론적 소급 해석과 외부 요인만을 강조하려는 일면적 망국사 해석 경향이며, 그 결과 은폐되어 온 진실은 민씨세도정치라는 망국의 중요한 내부 요인이었음을 밝혔다. 또한, 일본의 조야(朝野) 는 조선에 대한 영향력 확대라는 공통의 목표 아래, 오로지 국익에 따라 조선의 유력 정파와 정치가를 ‘이용’과 ‘폐기’의 대상으로 삼고 ‘활용’했다는 점에 착목하여, ‘친일=매국, 반일=애국’ 의 이분법적 프레임은 일본의 그러한 행동 방식과 간계를 파악하는 데에도 무력하다는 점을 지적하였다.

Kim, Okgyun, the leader of the Gapsin Coup, has been the symbol of the ‘pro Japanese faction’ while Queen Min, assassinated by Japanese thugs, has been the one of the ‘anti Japanese’ in Korea, based on their superficial relationship with Japan. In addition, the anti Japanese sentiment is often regarded as patriotic while proJapanese as treason. Such an oversimplified extreme view premised on the Japanese plan that involved the death of the two and the occupation of Korea. Then, what is the reason for this bizarre view, and why is it still shared by many even today? This paper examines the correlation between the deaths of the two figures and the Japanese intervention in it. It reveals a selective, misleading retroactive interpretation of the facts in history that covers up the reign of potentates of Queen Min’s family, as a major inner factor, that eventually led to the fall of Joseon. Furthermore, it delves into the Japanese plot to utilize such figures as Kim as a way to maximize its influence on Joseon. This paper argues that the old but established dualistic frame of pro and antiJapanese is ineffective in analyzing this Japanese imperial politics.

부력에 의해 상승하는 CO2는 모세관 진입압력이 부력보다 높은 특정 영역에 도달하였을 때 모세관장벽에 의해 더 이상 유동하지 못하고 집적되는 모세관격리를 나타낸다. 본 연구에서는 모세관 격리가 반영된대염수층의 불균질성에 따라 변하는 CO2의 저장량과 누출량을 측정하기 위하여 CO2 지중저장 모델에 대한수치 연구를 수행하였다. Leverett J-함수를 적용하여 지층의 불균질성에 따라 서로 다른 모세관압을 갖도록설정하였다. CO2의 대수층 내 유동양상은 투과도의 불균질도와 상관길이에 영향을 받는다. 본 연구의 결과에따르면 투과도의 변화가 심할수록 CO2 잔류격리량과 용해격리량은 감소하였지만, 모세관격리 효과로 인하여총 격리량은 증가하였다. 투과도의 수평 상관길이는 CO2의 공간적 분포에는 영향을 미쳤지만 CO2의 저장량과누출량에 미치는 영향은 미미하였다.

Under circumstances where capillary entry pressure is larger than buoyancy pressure of CO2, a numberof capillary barriers can exist and CO2 accumulates below them. This is a new trapping mechanism called capillarytrapping. In this study, numerical simulations of CO2 sequestration were performed to estimate the amount ofCO2 storage and leakage under different heterogenous systems considering capillary trapping. Leverett J-functionwas applied so that every grid block had a different capillary pressure curve being physically consistent withits heterogenous properties. The flow pattern of CO2 plume was dependent not only upon permeabilityheterogeneity but also its correlation length. As the permeability variation increased, the total amount of trappedCO2 increased due to effect of capillary trapping, although CO2 trapped by residual and dissolution trappingdecreased. The lateral correlation length of permeability field affected spatial distribution of CO2 but did not havesignificant effect on the amount of CO2 storage and leakage.

We demonstrated a successful fabrication of 4 ” Gallium Nitride (GaN)/Diamond High Electron Mobility Transistors (HEMTs) incorporated with Inner Slot Via Hole process. We made in manufacturing technology of 4” GaN/Diamond HEMT wafers in a compound semiconductor foundry since reported [1]. Wafer thickness uniformity and wafer flatness of starting GaN/Diamond wafers have improved greatly, which contributed to improved processing yield. By optimizing Laser drilling techniques, we successfully demonstrated a through-substrate-via process, which is last hurdle in GaN/Diamond manufacturing technology. To fully exploit Diamond’s superior thermal property for GaN HEMT devices, we include Aluminum Nitride (AlN) barrier in epitaxial layer structure, in addition to conventional Aluminum Gallium Nitride (AlGaN) barrier layer. The current collapse revealed very stable up to Vds = 90 V. The trapping behaviors were measured Emission Microscope (EMMI). The traps are located in interface between Silicon Nitride (SiN) passivation layer and GaN cap layer.

Resonance radiation trapping has a great influence on the characteristics of gas discharge. We calculate the spatial and spectral distribution of photons by Monte Carlo method in AC PDP cell.