자기여자(Self-Excitation) 방지를 고려한 시송전 선로에 관한 연구

이흥재(Hung-Jae Lee),김상섭(Sang-Seop Kim),박성민(Sung-Min Park),황봉환(Bong-Hwan Hwang),이남호(Nam-Ho Lee) 대한전기학회 2002 대한전기학회 학술대회 논문집 Vol.2002 No.7

HTML 요소를 이용한 음성 합성기 동작 제어

이항섭(Hang-Seop Lee),이정철(Jeong-Chul Lee),이영직(Young-Jik Lee) 한국통신학회 1998 한국통신학회 학술대회 및 강연회 Vol.1998 No.12

CNN-based Approach for Source Localization of an Engineering-scale Radioactive Waste Disposal Concrete

Hang-Lo Lee,Chang-Ho Hong,Ji-Won Kim,Jin-Seop Kim 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1

Source localization technique using acoustic emission (AE) has been widely used to track the accurate location of the damaged structure. The principle of localization is based on signal velocity and the time difference of arrival (TDOF) obtained from different signals for the specific source. However, signal velocity changes depending on the frequency domain of signals. In addition, the TDOF is dependent on the signal threshold which affects the prediction accuracy. In this study, a convolutional neural network (CNN)-based approach is used to overcome the existing problem. The concrete block corresponding to 1.3×1.3×1.3 m size is prepared according to the mixing ratio of Wolseong low-to-intermediate level radioactive waste disposal concrete materials. The source is excited using an impact hammer, and signals were acquired through eight AE sensors attached to the concrete block and a multi-channel AE measurement system. The different signals for a specific source are time-synchronized to obtain TDOF information and are transformed into a time-frequency domain using continuous wavelet transform (CWT) for consideration of various frequencies. The developed CNN model is compared with the conventional TDOF-based method using the testing dataset. The result suggests that the CNN-based method can contribute to the improvement of localization performance.

The Method for Evaluating Unsaturated Hydraulic Conductivity of the Bentonite-buffer Using Relative Humidity

Hang-Bok Lee,Jin-Seop Kim,Young-Chul Choi,Heui-Joo Choi,Kyungsu Kim 한국방사성폐기물학회 2014 방사성폐기물학회지 Vol.12 No.1

상대습도 데이터를 이용하여 벤토나이트 완충재 블록의 불포화 수리전도도 변화를 평가하였다. 불포화 매질에서의 물의 흐름을 나타내는 일반적인 분석해를 통해 상대습도를 통한 불포화 수리전도도 계산방안을 도출하였고, 이를 실제 수행한 실내 물 유입 실험 결과에 적용하여 포화가 진행됨에 따라 변화하는 완충재 불포화 수리전도도 양상을 확인하였다. 일반적인 포화 상태와는 확연히 다르게 수두 구배와 물의 유출량이 시간에 따라 불규칙하게 변화하는 결과를 나타냈으며, 벤토나이트 완충재의 불포화 수리전도도는 시간에 따라 증가하는 경향을 보였다. 수분 흡수로 인한 벤토나이트 입자 팽창 때문으로 인한 매질 내 공극의 부피 및 크기 확대가 불포화 수리전도도값의 증가를 야기하는 것으로 판단되었고, 이러한 결과는 완충재 블록의 팽창 정도와 수리전도도의 상관성에 관한 추후 연구의 필요성을 제시하였다. 본 연구에서 수행된 불포화 수리전도도 평가 방안은 방사성폐기물 처분 시 완충재의 장기적인 수리학적 성능평가에 유용한 기술로 사용될 수 있을 것이다.

Pyrethroid 계 농약 중독의 임상적 고찰

이철우,박규호,강문수,양동호,고봉민,배성한,전기원,박관석,정인섭,홍세용,오종용,오홍석,김명수 대한내과학회 1998 대한내과학회지 Vol.55 No.5

Objectives: Pyrethroids are commonly used pesticides, and acute human poisoning by these insecticides is common in Korea It has a high affinity to the sodium channel on cell membranes causing blockage, which results in neurotoxicity, hyperexcitation, and death. The purpose of this study was to analyze the clinical characteristics of acute pyrethroid poisoning. Methods: To evaluate the clinical characteristics (age, sex, causative agents, cause of ingestion, severity of poisoning and its clinical feature, prognosis, complication and results of the treatment), we analyzed the clinical reports of 30 patients with pyrethroid poisoning who were admitted to Soonchunhyang Chunan hospital from January 1992 to July 1997. Results: 1) 18 out of 30 patients with pyrethroid poisoning were male and the largest age group was above 60 years old. 2) The most common cause of ingestion was suicide, in 24 cases(80%). 3) There were 7 classes of causative agents of poisoning and all of these were classified into 2 grades according to the degree of WHO toxicity. Fenvlaerate and cypermethrin were the most common agents. 4) The degree of severity was classified into three groups-mild, moderate and life-threatened. Of these groups, mild poisoning was the most common. There was no significant difference in the age, type of pyrethoid and interval between pyrethroid ingestion and arriving at the emergency room between the three groups. However, the amount of ingestion was significantly higher in the life-threatened group, 5) The most common symptom of the patients was vomiting, in 19 patients, The classification were of three types (5 type I, 11 type II and 1 intermediate type) according to clinical characteristics. 6) There is no specific antidote, therefore therapy is generally supportive. There were three deaths, and the cause of death was respiratory failure. 7) The most common complication was pneumonia, in 3 cases(10%), which occurred in almost all patients in the life-threatened group. Conclusions: The most common age group of poisoning was over 60 years old, and suicide was the most common cause of ingestion. Treatment is supportive, and most causal exposures require only decontamination. There were three deaths, and the cause of death was respiratory failure in each case. The most common complication was pneumonia.

Analysis on Ultrasonic Attenuation of Concrete Depending on the Temperature, Dry, and Saturation Conditions

Hang-Lo Lee,Jin-Seop Kim,Chang-Ho Hong,Ji-Won Kim 한국방사성폐기물학회 2021 한국방사성폐기물학회 학술논문요약집 Vol.2021 No.11

Data-Driven Modelling of Damage Prediction of Granite Using Acoustic Emission Parameters in Nuclear Waste Repository

Lee, Hang-Lo,Kim, Jin-Seop,Hong, Chang-Ho,Jeong, Ho-Young,Cho, Dong-Keun Korean Radioactive Waste Society 2021 방사성폐기물학회지 Vol.19 No.1

Evaluating the quantitative damage to rocks through acoustic emission (AE) has become a research focus. Most studies mainly used one or two AE parameters to evaluate the degree of damage, but several AE parameters have been rarely used. In this study, several data-driven models were employed to reflect the combined features of AE parameters. Through uniaxial compression tests, we obtained mechanical and AE-signal data for five granite specimens. The maximum amplitude, hits, counts, rise time, absolute energy, and initiation frequency expressed as the cumulative value were selected as input parameters. The result showed that gradient boosting (GB) was the best model among the support vector regression methods. When GB was applied to the testing data, the root-mean-square error and R between the predicted and actual values were 0.96 and 0.077, respectively. A parameter analysis was performed to capture the parameter significance. The result showed that cumulative absolute energy was the main parameter for damage prediction. Thus, AE has practical applicability in predicting rock damage without conducting mechanical tests. Based on the results, this study will be useful for monitoring the near-field rock mass of nuclear waste repository.

Expression and Fuctional Analysis of Yeast ARS Binding Factor I Gene and Its Mutant Genes in Yeast

Lee, Sangkyung,So, In Seop,Cho, Gi-Nam,Jung, Gu-Hung,Rho, Hyune Mo,Kim, Jiyoung 경희대학교 유전공학연구소 1993 遺傳工學論文集 Vol.5 No.-

ABF I is a DNA binding protein which plays roles in DNA replication and in DNA transcription. The nucleotide sequence of cloned ABF I gene revealed several motifs characteristic of DNA binding proteins. In order to locate the protein domains which are important for function of ABF I, several ABF I mutants were generated by site-directed mutagenesis and expressed in S. cerevisiae with a temperature-sensitive lethal mutation in the ABF I gene. The abf1-ts strain showed rapid growth arrest at the non-permissive temperature but showed normal growth at the non-permissive temperature when a plasmid containing ABF I gene was introduced into the yeast cells. Among several mutant ABF I genes tested, mutant ABF I gene with a base substitution corresponding to the position of 61th His to Ala or of 360th Leu to Arg did not support growth of the is mutant at the non-permissive temperature. Our results indicate that the histidine residue in the putative zinc-finger region and the leucine residue in the leucine zipper region were important for the function of the ABF I in yeast.

The Effect of Price Promotional Information about Brand on Consumer's Quality Perception: Conditioning on Pretrial Brand

Lee, Min-Hoon,Lim, Hang-Seop Korean Academy of Marketing Science 2009 마케팅과학연구 Vol.19 No.3

典型的价格促销是指降低一定数量产品的价格或以相同的价 格获得更多数量的产品, 从而增加价值和创造经济的激励购买. 价格促销经常用来鼓励没有消费过产品或服务的用户试用产品或服务. 因此, 理解价格促销对那些从来没有使用过促销品牌的消费者的此品牌质量认知的影响是很重要的. 然而, 如果消费者通过价格促销获得的产品的质量不好, 促销可能达不到用经济的刺激方法来增加销售的效果. 相反则有可能发生. 具体来说, 通过价格促销消费者产生低的质量的认知会削弱经济的和心理上的激励, 减少购买的可能性. 因此, 对市场营销人员来说理解品牌的价格促销信息如何影响消费者对此品牌的质量的不良认知是非常重要的. 先前的有关价格促销对质量认知的影响的研究有不一致的解释. 一些是关注价格促销对消费者认知的不利影响. 但是其他的研究显示价格促销并没有提高消费者对品牌的不良认知. 之前的研究发现这些不一致的结果和价格促销曝光的时机以及相关的试验得出的质量评估有关. 而且, 消费者是否经历过产品促销都可能会调节这些影响. 一些研究把产品类别的不同作为基本的因素. 本研究的目的是探讨在不同的情况下, 价格促销信息对消费者的不良的质量认知产生的影响. 作者控制了促销曝光的时机, 过去的各种促销形式以及信息发布的方式. 与以往的研究不同, 作者通过控制以前个人使用此产品的经验的潜在调节作用来测试事先设定限制的价格促销的影响. 这样的操作可以解决相关的有可能产生的争议. 这种方法对实际工作方面也是有意义的. 价格促销不仅适用于已存在的目标消费者, 而且可以鼓励没有使用过产品和服务的消费者尝试此产品或服务. 因此, 对市场营销人员来说理解品牌的价格促销信息如何影响消费者对此品牌的质量的不良认知是非常重要的. 如果没有使用过这个品牌的消费者通过价格促销获得的产品的质量不好, 促销可能达不到用经济的刺激方法来增加销售的效果. 相反则有可能发生. 另外, 如果价格促销结束, 购买了这个产品的消费者可能会出现明显的减少再购买行为. 通过文献回顾, 假设1用来探讨消费者通过过去的价格促销获得的质量认知的调节作用. 消费者对没有使用过的品牌的价格促销而产生的质量认知的影响会被此品牌过去的价格促销活动所调节. 换句话说, 消费者会对没有进行过价格促销的没有使用过的品牌产生不良的质量认知. 假设2-1:未使用过的品牌进行首次价格促销的时候, 价格促销的信息发布的方式将影响价格促销的成败. 假设2-2:消费者越不在意价格促销的原因, 越容易对产品的质量产生不良的认知. 通过测试1, 简要地解释了产品和品牌在提供四种价格促销形式之前并解释说明了每种价格促销形式. WAVEX这个虚拟品牌的质量的认知被评估为7. 网球拍被选中的原因是由于选定的产品组必须过去几乎没有价格促销活动来消除促销的平均次数对价格促销信息的影响, 正如Raghubir和Corfman(1999)所提出的. 测试2也用网球拍作为产品组, 主持测试2的管理者与测试1相同. 随着测试1, 选择了对产品组熟悉而对产品不熟悉的受访者. 每个受访者被分配到代表WAVEX价格促销的两种不同信息发布方式的两组中的一组. 在评估WAVEX的质量认知为7以前, 受访者看了每个促销信息. 不熟悉的实验品牌的价格促销对消费者的质量认知的影响被证明为会被以前有过或没有价格促销活动所调节. 与过去的促销行为一致是使品牌评估变得更糟的不良影响的重要变量. 如果此品牌从未进行过

Spontaneous Dialogue Recognition with Large Out-of-Vocabularies

Lee, Hang Seop 대한전자공학회 1996 APCCAS:Asia Pacific Conference on Circuits And Sys Vol.1 No.1

This paper describes Korean spontaneous speech recognition system that is a part of speech-to-speech translation system being developed in ETRL The features of this system are as follows. First, we have started two large database human to human dialogs. The speech database used in training and evaluation of this system was composed of two task domains 339 dialogs collected on appointment scheduling domain and 535 dialogs collected on travel planning domain. Second, recognition performance was evaluated not only on no out-of-vocabulary (OoV) case but also on OoV case. From the evaluation result of spontaneous speech recognition with high OoV rate, we addressed the problem of Korean language and proposed solution.