액체질소의 방전형식과 방사 전자파에 대한 상호관계

이현동(Hyun Dong Lee),박광서(Kwang Seo Park),김기채(Ki Chai Kim),박원주(Won Zoo Park),이광식(Kwang Sik Lee),이동인(Dong In Lee) 영남대학교 정보통신연구소 1998 정보통신연구소논문집 Vol.5 No.1

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SANAA가 설계한 미술관에 나타나는 공간구성요소의 특성 연구

이현서 ( Hyun Seo Lee ),허범팔 ( Bum Pall Hur ) 한국공간디자인학회 2014 한국공간디자인학회논문집 Vol.9 No.2

(연구배경 및 목적)오늘날의 미술관은 전시만을 목적으로 하는 공간이 아닌 도시 디자인 및 기능에서도 전문적인 요구사항들이 충족되어야 하는 공간으로 발전되었다. 급변하고 다원화된 현대 사회에서 단순한 물리적 경계를 넘어서 다양하고 유기적으로 변화하는 공간의 영역을 건축과 사회, 건축과 공간의 관계성을 중요하게 생각하며 건축하는 SANAA의 미술관건축 작품을 중심으로 살펴보고 이를 통해 현대 미술관 건축의 흐름과 방향성을 제시하고자 한다. (연구방법)이에 본 연구는 선행 연구 논문을 통해 미술관의 개념과 공간구성요소를 구분하여 분류하고 이를 바탕으로 SANAA가 설계한 미술관 공간을 분석한다. (결과)SANAA가 설계한 미술관 건축의 공간구성요소의 특성은 건축물과 주변 환경의 상호 교류를 통해 만들어지는 관계성에 주목하고 단순화된 공간에서 내·외부의 경계를 통한 시각적 연속성이 보여지며 관람객이 주체가 되어 경험에 의해 만들어지는 공간을 형성하고 자연의 유입으로 자연과 건축물이 동화되는 일본 전통건축의 특성이 나타난다. 이와 같은 특성은 사용자에 의해 만들어지고 경험되어지는 새로운 공간의 창출을 가능하게 한다. (Background and Purpose) This study examines the art museum building products of SANAA, which builds structures with a deep awareness of the relationships between architecture and society. Consideration is given to the relationship between architecture and space in variously and organically changing spatial domains, moving beyond simple physical borders in a rapidly changing and diversified modern society. Finally, this research aims to suggest the flow and direction of modern art museum construction. (Method) Accordingly, this research classifies concepts related to art museums and spatial elements into advanced research theses. Based on this method, it analyzes art museum spaces designed by SANAA. (Result) The characteristics of the spatial elements in art museums designed by SANAA reveal attention to relationships created by mutual exchanges between buildings and their surrounding environments. They show visual continuity through internal/external borders in simplified spaces and then form spaces made by the experiences of audiences as subjects. The characteristics of Japanese traditional architecture, in which nature and buildings become assimilated through the inflow of nature, are revealed. Such characteristics make it possible to create new spaces made and experienced by users.

고지방식이와 STZ 유도 제2형 당뇨 마우스에서 새싹의 항당뇨 효과

이현서(Hyun-Seo Lee),강현주(Hyun Ju Kang),전인화(In Hwa Jeon),염정호(Jung Ho Youm),장선일(Seon Il Jang) 한국식품영양과학회 2014 한국식품영양과학회지 Vol.43 No.11

본 연구에서는 고지방식이와 streptozotocin으로 유도된 제2형 당뇨 마우스에서 새싹추출물의 항당뇨 효과를 살펴보았다. 제2형 당뇨 유도 후 4주 동안의 체중 변화를 관찰한 결과 새싹추출물군과 메트포민군에서 유의한 체중 감소 변화가 나타났으며, 식이섭취량에 따른 변화는 모든 실험군 간의 차이가 없었다. 공복혈당은 고지방식이군의 경우 실험종료일까지 지속적으로 상승하였고, 이와 대조적으로 새싹추출물과 메트포민군의 경우 실험 2주째부터 감소하여 실험 종료 4주째에서는 고지방식이군보다 유의적으로 감소하였다. 경구 내당능 검사는 포도당 섭취 후 60분, 90분, 120분에서 새싹추출물과 메트포민군이 고지방식이군보다 유의적으로 감소하였으며, 인슐린 내성 검사는 120분에서 새싹추출물과 메트포민군이 고지방식이군보다 유의성 있게 감소하였다. 혈중 지질 농도 변화에서 총콜레스테롤, 중성지방 그리고 LDL 콜레스테롤 농도는 고지방식이군에 비해 새싹추출물과 메트포민군에서 유의적으로 감소하였고, HDL 콜레스테롤 농도는 고지방식이군에 비해 새싹추출물과 메트포민군에서 증가하였다. 간독성의 지표인 glutamate oxaloacetate transaminase와 glutamate pyruvate transaminase 효소 활성도는 메트포민투여군과 고지방식이군을 제외한 실험군들 간에 유의성이 나타나지 않았다. 혈중 인슐린과 렙틴 농도는 고지방식이군에 비해 새싹추출물과 메트포민군에서 유의적으로 감소하였다. 이상의 결과를 바탕으로 새싹추출물은 제2형 당뇨 마우스에서 체중을 감소시키고 혈중지질 대사 이상을 조절하면서 인슐린 저항성을 감소시켜 혈당을 개선하므로 항당뇨 효과가 있는 우수한 식품 소재로서의 개발 가능성을 시사하고 있다. Sprout vegetables containing various types of polyphenols and flavonoids, are known to have anti-inflammatory, antioxidant, cholesterol-lowering, and anti-obesity activities. However, there have been few reports on the anti-diabetic efficacy of sprout vegetables. Here, we investigated the anti-diabetic effects of sprout extract obtained from buckwheat, beet, rape, broccoli, kohlrabi, red young radish, and dachai, in high fat diet (HFD) and streptozotocin (STZ)-induced type Ⅱ diabetes mellitus mice. The mice were fed a HFD (60% calories as fat) for 8 weeks prior to intraperitoneal injection with STZ (75 mg/kg). The diabetic mice were divided into four groups: standard diet (STD, 10% calories fat), HFD, HFD with sprout extract (SPE) and HFD with metformin (MET). After 4 weeks, body weight gain was much lower in both SPE and MET groups than in HFD group. In contrast, there was no difference experiment groups regarding food intake ratio. The level of fasting blood glucose was significantly lower in the SPE and MET groups compared to the HFD group. Oral glucose tolerance and insulin tolerance in the SPE and MET groups were significantly ameliorated in comparison to the HFD group. The concentrations of serum total cholesterol, triglycerides, and LDL cholesterol in the SPE and MET groups were remarkably reduced in comparison to the HFD group, and HDL cholesterol concentration was higher in the SPE and MET groups than in the HFD group. Glutamate oxaloacetate transaminase and glutamate pyruvate transaminase levels were between SPE and HFD groups. The serum insulin and leptin concentrations were significantly reduced in both the SPE and MET groups compared to the HFD group. Therefore, these results indicate that sprout extract could improve insulin resistance and attenuate blood glucose level in HFD/STZ-induced type Ⅱ diabetes mellitus mice. We conclude that this study may provide positive insights into sprout extract as a functional food ingredient for treatment of type Ⅱ diabetes mellitus.

이산 웨이브렛변환에 의한 부분방전패턴 분석

이현동(Hyun-Dong Lee),김충년(Chung-Nyun Kim),지승옥(Seung-Wook Jee),박광서(Kwang-Seo Park),이광식(Kwang-Sik Lee),이동인(Dong-In Lee) 한국조명·전기설비학회 2000 한국조명·전기설비학회 학술대회논문집 Vol.2000 No.-

This paper deals with multiresolution analysis of wavelet transform for partial discharge(PD), both corona and surface discharge. Multiresolution analysis was used for performing discrete wavelet transform. PD signals was decomposed into "approximation" and "detail" components until 4 levels by using discrete wavelet analysis. In this paper, daubechies family is adopted for the research of the characteristics of PD signals. The results show that in corona discharge the segment 7, 8, 9, 10, 11 values of defined variable is increased with discharge process, so phase distribution is characterized by 210~330 ranges. In case surface discharge in expoxy insulator inserted, defined variable values is fairly symmetric discharge pattern because coupled both corona and dielectric bounded discharges. We can confirmly discriminate the type of PD source.

웨이브렛 변환을 이용한 부분방전 신호의 분석

李炫東(Hyun-Dong Lee),金忠年(Chung-Nyun Kim),朴光緖(Kwang-Seo Park),李廣植(Kwang-Sik Lee),李東仁(Dong-In Lee) 대한전기학회 2000 전기학회논문지C Vol.49 No.11

대학 모델과(科) 전공자에 내재된 대인관계효능감, 실패내성, 캐스팅스트레스의 관계

이현서(Lee, Hyun-Seo),조우영,이재원,김선희,이한성 한국모델콘텐츠학회 2023 한국모델콘텐츠학회지 Vol.4 No.1

본 연구는 대학 모델과(科) 전공자의 캐스팅스트레스와 관련하여 대인관계효능감, 실패내성의 관계를 알아보고자 실시하였다. 연구 대상은 수도권 지역에 소재하고 있는 대학 (D, D, K, S) 모델과 재학생 268명을 대상으로 본 조 사 설문을 실시하였다. 자료처리는 SPSS 21.0 프로그램을 이용하여 탐색적 요인분석(exploratory factor analysis) 과 내적일관성계수(Cronbach’s α), 상관관계 분석(correlation analysis), 회귀분석(regression analysis), 경로분 석(path analysis), 매개효과 유의성 검증을 위해 부트스트래핑(bootstrapping) 기법을 사용하였다. 결과는 첫째, 대인관계 효능감은 캐스팅스트레스에 부적(-)인 영향을 미치는 것으로 나타났다. 둘째, 대인관계효능감은 실패내성에 정적(+)인 영향을 미치는 것으로 나타났다. 셋째, 실패내성은 캐스팅스트레스에 부적(-)인 영향을 미치는 것으로 나 타났다. 넷째, 대인관계효능감과 캐스팅스트레스와의 관계에서 실패내성이 완전매개하는 것으로 나타났다. 결론적으 로 모델과(科) 전공자들이 경험하는 대인관계효능감과 캐스팅스트레스관계에서 실패내성이 중요한 영향을 미치는 변 인임을 알 수 있었다. The purpose of this study was to investigate the relationship between interpersonal efficacy and failure tolerance in relation to casting stress among university model majors. The study participants consisted of 268 university (D, D, K, S) model students located in the metropolitan area, and a survey was conducted. Data processing involved the use of the SPSS 21.0 program for exploratory factor analysis, Cronbach’s α, correlation analysis, regression analysis, path analysis, mediation significance, and bootstrapping techniques. The results revealed the following: First, interpersonal efficacy had a negative (-) effect on casting stress. Second, it was found that interpersonal efficacy had a positive (+) effect on failure tolerance. Third, failure tolerance had a negative (-) effect on casting stress. Fourth, it was found that failure tolerance completely mediated the relationship between interpersonal efficacy and casting stress. In conclusion, it was observed that failure tolerance is an important factor influencing the relationship between interpersonal efficacy and casting stress experienced by model majors.

성인 고환 생식세포종양에 대한 치료 및 장기 추적결과

박서용(Seo Young Park),임수현(Soo Hyun Lim),이건석(Geonseok Lee),서성일(Seongil Seo),전성수(Seongsoo Jeon),이현무(Hyun Moo Lee),최한용(Han Yong Choi),정병창(Byong Chang Jeong) 대한비뇨기종양학회 2011 대한비뇨기종양학회지 Vol.9 No.2

Purpose: To present the therapeutic strategies and long-term follow-up results of testicular germ cell tumors (GCT) based on an 11-year single center experience. Materials and Methods: The medical records of testis cancer cases diagnosed between January 1996 and November 2006 were reviewed. Patient demographics, cancer histopathology and stage, adjuvant therapy, survival data are reviewed and analyzed. Results: A total of 51 testicular GCT, including seminoma in 31, and non-seminomatous GCT (NSGCT) in 20 were enrolled in the present study. Mean patient age at diagnosis was 35.6 years (range 18-69), with a median follow-up of 53 months (range 5-163). There were no cases with bilateral testicular GCT in this study cohort. Among 51patients, 30 (58.8%) were stage I, 10 (19.6%) were stage IIA/IIB, and 11 (21.6%) were IIC/III. Of the 30 patients with stage I testicular GCT, two patients who had been under surveillance showed relapse at retroperitoneal lymph nodes, and both patients cured with salvage chemotherapy. Meanwhile, there was no recurrence in 14 patients who received adjuvant chemo or radiotherapy after radical orchiectomy. The overall 5-year cancer specific survival was 95.9%. Conclusions: Our long-term follow-up results confirm the excellent prognosis for patients with testicular GCT, and indicate that surveillance does not compromise survival. In stage I testicular germ cell tumor, active surveillance could minimize treatment-related morbidity. Before deciding surveillance, however, psychological impacts on patients, economic and social costs in addition to patients’ compliance should also be considered.

Predictive Factors for Acute Urinary Retention After Transperineal Template-Guided Mapping Biopsy

Si Hyun Sung(성시현),Chung Un Lee(이충언),Jae Hoon Chung(정재훈),Wan Song(송완),Minyong Kang(강민용),Hyun Hwan Sung(성현환),Byong Chang Jeong(정병창),Seong Il Seo(서성일),Seong Soo Jeon(전성수),Hyun Moo Lee(이현무),Hwang Gyun Jeo 대한비뇨기종양학회 2021 대한비뇨기종양학회지 Vol.19 No.3

Purpose: We investigated the predictive factors for acute urinary retention (AUR) after transperineal template-guided mapping biopsy (TTMB). Materials and Methods: We retrospectively reviewed the records of 459 patients who had undergone TTMB between May 2017 and July 2020. Overall complications after TTMB were analyzed and categorized according to the Clavien-Dindo classification. Factors that were likely to affect AUR were analyzed using a logistic regression model. Results: Overall complications after TTMB were observed in 95 of the 459 patients (20.7%), of which AUR was the most commonly reported (17.4%, n=80), followed by hematuria (3.1%, n=14). Hematuria in one patient was categorized as Clavien-Dindo grade IIIa. All remaining complications were Clavien-Dindo grade I. In the multivariate regression model, age ≥65 (odds ratio, 2.44; 95% confidence interval [CI], 1.42–4.17; p=0.001), prostate volume ≥30 mL (odds ratio, 3.72; 95% CI, 1.19–11.62; p<0.02), and number of biopsy cores ≥30 (odds ratio, 2.89; 95% CI, 1.29–6.43; p=0.01) were identified as the predictors for AUR after TTMB. Conclusions: AUR is the most common complication after TTMB. Age ≥65 years, prostate volume ≥30 mL, and number of biopsy cores ≥30 were significant predictors of AUR following TTMB.

웨이브렛 변환을 이용한 부분방전 신호의 분석

이현동,김충년,박광서,이광식,이동인,Lee, Hyun-Dong,Kim, Chung-Nyun,Park, Kwang-Seo,Lee, Kwang-Sik,Lee, Dong-In 대한전기학회 2000 전기학회논문지C Vol.55 No.12

This paper deals with the multiresolution analysis of wavelet transform for partial discharge(PD). Test arrangement is based on the needle-plane electrode system and applied AC high voltage. The measured PD signal was decomposed into "approximations" and "details". The approximation are the high scale, low-frequency components of the PD signal. The details are the low-scale, high frequency components. The decomposition process are iterated to 3 level, with successive approximation being decomposed in turn, so that PD signal is broken down into many lower-resolution components. Through the procedure of signal wavelet transform, signal noise extraction and signal reconstruction, the signal is analyzed to determine the magnitude of PD.

모의 순환 관로시스템에서 체류시간 및 pH 조절이 수질변화에 미치는 영향

이현동(Hyun Dong Lee),정원식(Won Sik Chung),지재성(Chai Sung Gee),서규태(Gyu Tae Seo) 大韓環境工學會 1998 대한환경공학회지 Vol.20 No.7