• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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• pp.256-257
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• 2005

To estimate a electrical performance of the extra high voltage XLPE cable the discharge properties due to shift of void position were investigated. The $\Phi-q-n$ properties have been measured at room temperature by rising voltage ratio of 0.5[kV]. An obtained data was stored to personal computer through A/D converter. The period of applied wave form and discharge values were divided into 64 parts and discharge values generated during 10 seconds were accumulated by phases. As a result, it was confirmed that the charge, phase angle and counts of discharge changed due to void position.

• 한국식품영양과학회지
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• 제29권2호
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• pp.218-223
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• 2000

The objective of this study was to investigate the effectiveness of preservatives for extending storage life and maintaining the quality of minimally processed Chinese cabbage. Cut Chinese cabbage was treated with either 1% CaCl2, 1% NaCl, 3% sucrose, 1% Ca-lactate, 1% vitamin C, 0.05% chitosan＋1% vitamin C, 0.1% Sporix＋1% vitamin C or hot water(6$0^{\circ}C$) and then packed with polyethylene film(60${\mu}{\textrm}{m}$) and stored at either 2$0^{\circ}C$ or 4$^{\circ}C$. To evaluate biochemical changes and quality of minimally processed Chinese cabbage, the samples were tested to determine the amount of vitamen C, titratable acidity, organic acid and fiber contents. Changes in color were also examined. The quality of kimchi prepared form minimally processed cabbage was affected by the treatments. REsults indicate that the minimally processed Chinese cabbage treated with either 1% CaCl2 at 2$0^{\circ}C$ and 4$^{\circ}C$ or 1% NaCl at 2$0^{\circ}C$ minimized biochemical changes in plant tissue and those treatments were most effective in maintaining product quality. The cabbage treated with 1% vitamin C or 1% NaCl at 4$^{\circ}C$ resulted in kimchi with improved color, texture, flavor and the best overall acceptability, as determined by a sensory test.

• International Journal of Internet, Broadcasting and Communication
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• 제11권4호
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• pp.18-25
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• 2019

The public data portal provides various public data created by the government in the form of files and open APIs. In order to increase the usability of public open data, a variety of information should be provided to users and should be convenient to use for users. This requires the structured data design plan of the public data. In this paper, we propose a data design method to improve the usability of the Seoul subway public data. For the study, we first identify some properties of the current subway public data and then classify the data based on these properties. The properties used as classification criteria are stored properties, derived properties, static properties, and dynamic properties. We also analyze the limitations of current data for each property. Based on this analysis, we classify currently used subway public data into code entities, base entities, and history entities and present the improved design of entities according to this classification. In addition, we propose data retrieval functions to increase the utilization of the data. If the data is designed according to the proposed design of this paper, it will be possible to solve the problem of duplication and inconsistency of the data currently used and to implement more structural data. As a result, it can provide more functions for users, which is the basis for increasing usability of subway public data.

• 한국전자통신학회논문지
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• 제13권6호
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• pp.1191-1198
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• 2018

윈드프로파일러 레이더는 고정점에서 대기물리 신호와 바람 벡터의 연직 프로파일을 제공한다. 바람 벡터는 제조사의 자료 처리 프로그램으로 산출되기 때문에 품질 관리에 한계가 있다. 따라서 바람 벡터의 품질을 향상시키기 위해서 원시 스펙트럼 자료의 이해와 활용이 이루어져야 한다. 바람 벡터의 원시 자료는 바이너리 형태로 저장되는 파워 스펙트럼 밀도이다. 본 연구에서는 원시 자료를 실수형 스펙트럼 밀도로 변환하는 알고리즘을 완성하고 스펙트럼 기반 0차와 1차 모멘트를 구현하여 원시 자료의 활용을 평가하였다.

• 대한임상독성학회지
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• 제17권1호
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• pp.1-6
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• 2019

Scombroid fish poisoning (SFP) is a form of histamine food poisoning caused by the ingestion of improperly stored fish. The term "scombroid" derives from the family name of the fish family first implicated, such as tuna and mackerel. On the other hand, non-scombroid fish species, such as sardine and herring, can also cause histamine poisoning. The histamine is converted from histidine by a bacterial enzyme in the causative fish. Because the symptoms of SFP can easily be confused with food allergies, it is believed to have been significantly under-reported. In 2016, an outbreak of SFP occurred among primary school students who had eaten yellowtail steak in Korea. The most common findings consisted of a rapid onset of flushing of the face and trunk, erythematous and urticarial rash, diarrhea, and headache occurring soon after consuming the spoiled fish. Usually, the course is self-limiting and antihistamines can be used successfully to relieve symptoms, but several life-threatening SFP cases have been reported. Clinical toxicologists should be familiar with SFP and have competency to make a differential diagnosis between fish allergy and histamine poisoning. SFP is a histamine-induced reaction caused by the ingestion of histamine-contaminated fish, whereas a fish allergy is an IgE-mediated reaction. This review discusses the epidemiology, pathophysiology, diagnosis, treatment, and preventive measures of SFP.

• Nuclear Engineering and Technology
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• 제51권1호
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• pp.214-220
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• 2019

Thermochemical cycles have been predominantly used for energy transformation from heat to stored chemical free energy in the form of hydrogen. The thermochemical cycle based on uranium (UTC), proposed by Oak Ridge National Laboratory, has been considered as a better alternative compared to other thermochemical cycles mainly due to its safety and high efficiency. UTC process includes three steps, in which only the first step is unique. Hydrogen production apparatus with hectogram reactants was designed in this study. The results showed that high yield hydrogen was obtained, which was determined by drainage method. The results also indicated that the chemical conversion rate of hydrogen production was in direct proportion to the mass of $Na_2CO_3$, while the solid product was $Na_2UO_4$, instead of $Na_2U_2O_7$. Nevertheless the thermochemical cycle used for hydrogen generation can be closed, and chemical compounds used in these processes can also be recycled. So the cycle with $Na_2UO_4$ as its first reaction product has an advantage over the proposed UTC process, attributed to the fast reaction rate and high hydrogen yield in the first reaction step.

• 대한설비공학회지:설비저널
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• 제8권4호
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• pp.221-236
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• 1979

The three years Performance of a liquid type solar heating system has been determined for a system which has been determined for a system which has been operating continuously since 1976 in Seoul with no serious maintenance. A flat plate collector is used to transform incident solar radiation into thermal energy. This energy is stored if the form of sensible energy and used as needed to supply the space heating loads. An electric auxiliary heaters are provided to supply energy for space heating load when the energy in the storage tank is depleted. The ratio of useful collected solar heat divided by the total solar radiation on the collector was obtained about 84 per cent. It is also obtained the relation between ratio of solar collector area to the heating area and the ratio of useful collected solar energy to the heating load for the useful design data. A comparison between the measured and simulated results with the solar space heating system is described. Hour by hour simulation is made on unsteady state basis using the system parameters and meteorological data at the experiment site. The result of comparison turned out satisfactory for the solar heating system, though the simulation was formed somewhat higher than by experimental.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제6권9호
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• pp.397-406
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• 2017

클라우드 환경에서의 대용량 암호화 데이터 서비스를 위하여 기존의 암호화 알고리즘을 사용할 경우 데이터 암호화에 많은 시간 소요의 문제점이 대두된다. 이러한 단점을 보완하기 위해 일반적으로 부분 암호화 방법을 사용한다. 그러나 기존의 부분 암호화 방법은 암호화되지 않은 잔존 영역으로 인해 암호화된 데이터를 유추할 수 있다는 단점이 존재한다. 본 논문에서는 이러한 단점을 해결하기 위해 암호화 속도를 높이면서 보안을 준수하는 부분 암호화 방법을 제안한다. 제안하는 방법은 헤더 생성, 부분 암호화, 블록 셔플의 과정으로 구성된다. 1단계 헤더 생성 과정에서는 알고리즘에 필요한 헤더 데이터를 생성하고 2단계 부분 암호화 과정에서는 LEA (Lightweight Encryption Algorithm)를 이용하여 데이터의 일부분을 암호화하고 암호화하지 않은 부분의 데이터와 암호화 과정 중에 생성된 블록을 XOR하여 모든 데이터를 변형시키며, 3단계 블록 셔플 과정에서는 헤더에 저장한 셔플 데이터를 이용하여 블록을 섞어 데이터를 알아볼 수 없는 형태로 바꾸어 암호화를 수행한다. 제안하는 방법을 모바일 디바이스에 적용하여 구현한 결과 암호화한 데이터는 알아볼 수 없는 형태로 모두 바뀌어 데이터를 유추할 수 없었고, 암호 키 없이는 데이터를 복원할 수 없었다. 제안하는 방법은 블록 경량 암호화 알고리즘인 LEA에 비해 암호화 속도가 약 273% 정도 향상되어 대용량 데이터를 암호화하는데 있어 빠른 처리가 가능함을 확인하였다.

• 정보처리학회논문지A
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• 제10A권5호
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• pp.529-538
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• 2003

웹의 빠른 발전은 인터넷 기반의 원격 교육 도구들을 급속히 성장시키고 있다. 웹에서는 상호간의 정보를 서로 교환하고 표현할 때 사용자의 브라우저에서 볼 수 있는 HTML(Hyper Text Markup Language)로 제작된다. 하지만, HTML 의 구조적 단점은 모든 분야의 데이터를 저장 하고 다른 형태의 데이터로 변화될 수 있는 강한 힘을 지닌 XML(eXtensible Markup Language)을 필요로 하게 되었다. 그러나 강력한 XML 자체만으로 장점을 활용하여 어렵기 때문에 관련 XML 표준의 적절한 응용이 필요하다. 현재 사이버 교육 사이트들의 강좌 데이터는 서로 공유될 수 없으므로 사용자들은 사이버스쿨이 제공하는 기능만을 수동적으로 사용하기만 해야 한다. 이 한계를 해결할 수 있는 방법으로서, 본 연구에서는 사이버 강좌관리 시스템을 위해 통일된 XML데이터 구조를 정의하고 서버와 클라이언트의 처리되는 모델을 제시하였다. 웹에서의 가상 교육에 대한 데이터를 XML 로 저장함으로서 한번 저장된 데이터를 어떤 사이트에서든 조금의 수정없이 재 사용할 수 있게 되었다. 사용자적인 측면에서, 교수자와 학습자를 두어 어떤 종류의 사이버강좌라도 쉽게 관리할 수 있고 다양한 멀티미디어 자료와 쉬운 사용자 인터페이스를 제공하여 많은 학습자료들을 두어 어떤 종류의 사이버강좌라도 쉽게 관리할 수 있고 다양한 멀티미디어 자료와 쉬운 사용자 인터페이스를 제통해 XML 형태로 저장하고 추출하므로써 가능하게 되었고 정보활용에 극대화를 가져올 것이다.

• 한국발생생물학회:학술대회논문집
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• 한국발생생물학회 2003년도 제3회 국제심포지움 및 학술대회
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• pp.74-74
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• 2003

In present study, attempts were made to preserve abalone (Haliotis discus hannai) sperm in liquid form at low temperature, to evaluate the effect of various diluents in short-term storage on sperm, and cryopreservation procedures were optimized for the cryoprotectants as well as freezing rates, in terms of the motility and survival rate, and the ultrastructural changes of sperm after short-term storage and cryopreservation were observed. The abalone sperm reached maximum motility until about 4min after activation. The motility was constant for about 16min, after which it dropped gradually, and about 50min later all motility ceased. Threshold activation of sperm was found in 40% artificial seawater (ASW), and motility increased as the concentration of ASW increased. In Hanks balanced salt solution without calcium (Ca-Free HBSS, 300 and 400 mOsmol/kg) and 10%, 20%, and 30% ASW the sperm was immotile, and motility once again restored incompletely only in HBSS of 300 and 400 mOsmol/kg, 20% and 30% ASW after 100% ASW was added. Sperm motility was extended following 20 days of cold storage only in 70% and 100% ASW. A high motility index of 3.5-4.5 was observed for the first 8 days in 70% and 80% ASW. In other diluents sperm motility was constant less than 10 days, and the motility index was obviously lower than that of sperm in 70% and 100% ASW. After 20 days of cold storage survival rates of 10.2%-20.7% were obtained in ASW and 300 mOsmol/kg HBSS, and that in 400 HBSS (65.3%) was significantly higher than others. The constant period of sperm motility stored in 70% ASW was longer obviously than that in 100% ASW after 6 days of storage, and the time to maximum motility of sperm stored in 70% increased gradually, while the difference in which of sperm in 100% ASW was not significant. The sperm plunged into liquid nitrogen all died except that sperm using 15% glycerol as cryoprotectant restored 10.4% of motility. The highest motility index (3.4) was obtained with 5% glycerol and freezing procedure: $50^{\circ}C$/min from $20^{\circ}C$ to $-80^{\circ}C$.