단층 프리폼 대공간 구조물의 노드에 대한 축하중 구조성능 평가

이경주,오진탁,황경주,주영규,김상대,Lee, Kyoung-Ju,Oh, Jin-Tak,Hwang, Kyung-Ju,Ju, Young-Kyu,Kim, Sang-Dae 한국강구조학회 2012 韓國鋼構造學會 論文集 Vol.24 No.1

Results of the analysis of the structural behavior of axially loaded nodes in freeform structure were not fully understood due to certain difficulties, including the application of various welding and bolting types. In this study, a node of single layered freeform structure was tested to determine its structural behavior when subjected to axial loads. The tests were classified into node ball tests to evaluate the center of the node subjected to cyclic and monotonic loading. The node part tests were also conducted to evaluate the whole node subjected to monotonic loading. The test showed that the node ball is safe with the tensile force, but the node ball needs to increase its strength with the node loaded compressive force due to the additional bending moment of the node ball's asymmetric form. 프리폼 구조의 노드는 용접 및 볼트 접합 특성을 반영하는 것이 어려워 구조 성능을 해석적으로 평가하는 것에는 한계가 있다. 본 연구에서는 축하중을 받는 프리폼 구조 노드의 구조 거동을 알아보고 성능을 평가하기 위해 실험을 수행하였다. 실험은 노드 중심부의 성능을 알아보기 위한 노드 볼 실험과 노드부 전체의 내력 평가를 위한 노드부 실험으로 구분된다. 노드 볼 구조 성능 평가에서는 축력에 대한 단조가력과 반복가력 실험을 하였고 노드부 구조 성능 평가에서는 단조가력 실험을 수행하였다. 실험 결과 노드 접합부 설계가 적합하므로 실제 구조물에 인장 발생 시 노드 볼이 충분한 내력을 가지며 안전할 것으로 판단되나 압축 발생 시 노드 볼 형상의 비대칭에 따른 모멘트 발생으로 내력이 저하된 현상을 보였다.

고수축 극세사 와이퍼의 고기능화

이경주,이창환,박근후,이준희,김성훈,Lee, Kyung-Ju,Lee, Chang-Hwan,Park, Keun-Hoo,Lee, Jun-Hee,Kim, Seong-Hun 한국섬유공학회 2009 한국섬유공학회지 Vol.46 No.5

The optimization of the high shrinking process has been performed for the high performance wiping cloth having excellent performance, which is based on the microfiber composed of the nylon and polyester in the TFT-LCD industry. To satisfy the required performance as an industrial wiping cloth in the TFT-LCD area, the wiper has excellent dust removal ability. Oil and water absorbing performance has a less dust particle generated by the solvent and the anti-scratch property on the surface of LCD product. These requirements could be achieved by high shrinking treatment for a microfiber knitted fabric to the selected best conditions. In this study, 10% of benzyl alcohol concentration and $110{\sim}120^{\circ}C$ of heating temperature were selected as the best treatment condition through the experiment considering all the related parameters such as temperature, concentration of agent and used fiber type. Then, Shrinking, SEM, and tensile strength performance were analyzed and compared with that commercialized products, being widely used in TFT-LCD area.

중성자 에너지 측정을 위한 NE213-PSD 장치의 감응 분석

이경주,Lee, Kyung-Ju 한국분석과학회 1992 분석과학 Vol.5 No.4

방사선 중성자 선원의 에너지 스펙트럼을 측정하기 위하여 액체 섬광 검출기(NE213)와 펄스모형 분리장치를 감마선 선원과 중성자 선원을 이용하여 그 감응 특성을 분석하였다. Am-Be 선원을 이용하여 이 장치에 대한 "Figure of Merit"을 측정한 결과 1.13 이었다. 이 값은 단색 에너지 중성자 선원인 $^{12}C(d,\;n)^{13}N$에서의 1.3 과 상당히 유사한 값을 보여 준다. NE213-PSD 장치의 성능 시험을 위한 이 실험결과는 중성자-감마 혼합 방사선장에서 스펙트럼의 측정과 중성자 에너지 스펙트럼과 속밀도 측정표준을 확립하는 데 기술적으로 유용하게 쓰일 것이다. In order to measure the energy spectrum of a radioactive neutron source, the pulse shape discrimination (PSD) system with organic scintillator, NE-213, was characterized by using some of the gamma ray sources and neutron source, Am-Be. The figure of merit of the rise time spectrum of AmBe source measured by this system was about 1.13. This value agrees well with the value of 1.3 which is measured for monoenergetic source, $^{12}C(d,\;n)^{13}N$. The results of present experiment for performance test of NE213-PSD system will provide the useful technique to measure the spectrum of neutron-gamma mixed field and to establish the neutron energy spectrum and flux density standards.

A Comparison of Acoustical Characteristics between International Speech Test Signal and Korean Speech Stimuli

이경주(Kyung ju Lee),진인기(In Ki Jin) 한국언어청각임상학회 2018 Communication Sciences and Disorders Vol.23 No.1

배경 및 목적: 국제어음시험신호(International Speech Test Signal)는 청각 보조기기의 평가를 위하여 국제적으로 통용되는 시험 신호로 6개의 언어로 구성되어 있으며 여성 화자의 담화(바람과 해님) 녹음본을 음절 단위로 분할하고 무작위로 혼합하여 개발되었다. 각 언어마다 음향학적 및 언어적 특징이 다르기 때문에 국내에서 사용되고 있는 국제어음시험신호가 한국어의 음향학적 특징을 반영할 수 있을지는 확실하지 않다. 따라서 본 연구의 목적은 한국어 어음 샘플과 국제어음시험신호의 어음역동범위, 장기평균어음스펙트럼을 측정하여 비교하고자 하였다. 방법: 한국어를 모국어로 사용하는 여성 화자 50명을 대상으로 국제어음시험신호와 동일한 담화인 ‘바람과 해님’의 녹음을 진행하였다. 각 녹음파일들을 국제어음시험신호와 동일한 조건으로 조절한 후 한국어 어음 샘플과 국제어음시험신호의 어음역동범위와 장기평균어음스펙트럼을 구하였다. 결과: 한국어 어음 샘플은 전 주파수 대역에서 국제어음시험신호보다 더 좁은 어음역동범위를 보였다. 또한, 장기평균어음스펙트럼의 경우 한국어 어음 샘플이 1,600 Hz 이하의 주파수 대역에서는 국제어음시험신호보다 높은 값을 보이는 반면에 1,600 Hz 이상의 주파수 대역에서는 국제어음시험신호가 한국어 어음 샘플보다 더 높은 값을 보였다. 논의 및 결론: 본 연구의 결과는 국제어음시험신호가 한국어 어음 자극의 음향학적 특징을 반영하지 못하는 것을 보여준다. 그러므로 한국인을 대상으로 보청기의 평가 및 적합을 시행할 때에는 국제어음시험신호보다 한국어에 기반한 신호음이 적용되었을 때, 더욱 정확한 평가 및 적합 결과를 산출할 수 있을 것이다. Objectives: The International Speech Test Signal (ISTS) is an internationally recognized test signal that is being used in many countries to analyze technical evaluations of hearing instruments. It was recorded using six different languages, with six different women reading ‘The North Wind and the Sun’. Although the ISTS reflects the acoustic characteristics of six different languages’, it is unclear whether the ISTS reflects languages which are not included in the ISTS, such as the Korean language. The purpose of this study was to compare the Speech Dynamic Range (DR) and the Long-Term Average Speech Spectrum (LTASS) between the ISTS and the Korean speech stimuli. Methods: Fifty female talkers who speak Korean as a native language participated in the recording of a Korean translation of ‘The North Wind and the Sun’. Recorded Korean speech stimuli were concatenated without any pauses and were normalized at 65 dB SPL. Then, the DR and the LTASS were compared between the ISTS and the Korean speech stimuli. Results: For the DR, the ISTS were higher than the Korean speech stimuli in most frequency bands. LTASSs of Korean stimuli were higher than LTASSs of the ISTS in the frequency band below 1,600 Hz. However, LTASSs of ISTS were higher than LTASSs of Korean stimuli in the frequency band above 1,600 Hz. Conclusion: The current result indicate that the ISTS seems to not reflect the linguistic acoustic characteristics of Korean speech stimuli. Thus, a test signal based on the Korean language may be more effective for accurate hearing aid evaluation and verification of Korean hearing aid users.

전도성 섬유를 사용한 손목 부위에서의 맥박 계측에 관한 기초 연구

이경주(Kyung-ju Lee),이재원(Jae-Won Lee),민지홍(Ji-Hong Min),김동준(Dong-jun Kim),김경호(Kyung-Ho Kim) 대한전기학회 2019 대한전기학회 학술대회 논문집 Vol.2019 No.2

비분절형 백반증의 재발에 대한 임상적 연구

이경주 ( Kyung-ju Lee ),정준형 ( Jun Hyeong Jeong ),이재원 ( Jae Won Lee ),황혜원 ( Hyewon Hwang ),신현태 ( Hyun-tae Shin ),변지원 ( Ji Won Byun ),최광성 ( Gwang Seong Choi ),신정현 ( Jeonghyun Shin ) 대한피부과학회 2024 대한피부과학회지 Vol.62 No.6

Background: Vitiligo, which is characterized by depigmented patches on the skin, poses challenges in achieving lasting repigmentation after treatment. Identifying factors contributing to vitiligo recurrence is vital for effective management; however, there is a significant knowledge gap regarding post-treatment recurrence factors in patients with vitiligo. Objective: We aimed to investigate the factors associated with recurrence in patients with non-segmental vitiligo. Methods: We retrospectively analyzed patient’s medical records from 2000 to 2023, and defined a “cure group” with cosmetically satisfactorily repigmentation maintained for at least 6 months. This group was further divided into recurrence and non-recurrence groups. We analyzed the clinical characteristics and various factors related to treatment. Furthermore, we explored the cure and recurrence rates based on the location of vitiligo, and performed a survival analysis for recurrence with or without maintenance therapy. Results: Of 70 cured patients, 19 relapsed. Maintenance treatment was the most significant factor affecting vitiligo recurrence (p<0.0001, odds ratio=0.029). There were no statistically significant differences in initial age, sex, disease duration, sites, subtype, treatment duration, treatment modality, and comorbidities. After 100 months, 87.3% of the patients in the maintenance therapy group remained recurrence-free, while only 20% of the non-maintenance therapy group did not experience recurrence. Head and neck lesions had the highest cure rates, whereas lower limb lesions showed higher recurrence rates. Approximately 63.2% of recurrences occurred at the original site, while 31.6% occurred outside the original site. Conclusion: The absence of maintenance therapy was the most important factor associated with the recurrence of nonsegmental vitiligo. (Korean J Dermatol 2024;62(6):327∼335)

간질환자에서 Vibrio cholerae non-O1에 의한 화농근육염

이경주 ( Kyung Ju Lee ),박경화 ( Kyung Hwa Park ),장희창 ( Hee Chang Jang ),김성은 ( Seong Eun Kim ),장미옥 ( Mi Ok Jang ),정숙인 ( Sook In Jung ),신종희 ( Jong Hee Shin ) 대한내과학회 2010 대한내과학회지 Vol.78 No.4

Vibrio cholerae non-O1 mainly causes gastroenteritis and rarely causes extraintestinal infections, such as bacteremia. Skin and soft tissue infections are also possible, but the incidence rate is very low. Although the most common cause of pyomyositis is Staphylococcus aureus, Gram-negative organisms such as Vibrio species may also cause pyomyositis in patients with chronic liver disease. Pyomyositis caused by Vibrio cholerae non-O1 has not been reported in Korea. Here, we report a case of pyomyositis caused by V. cholerae non-O1 bacteremia in a patient with liver cirrhosis following seafood exposure. This case study suggests that V. cholerae, as well as V. vulnificus, should be considered when soft tissue infections occur in patients with liver cirrhosis after seafood exposure. In addition, physicians should consider imaging studies for a prompt diagnosis if the patient complains of severe pain disproportionate to the skin manifestation. (Korean J Med 78:518-522, 2010)

핑크-알로에의 항산화, NO 생성 억제 및 세포 재생 효과

이경주 ( Kyung Ju Lee ),장욱주 ( Wookju Jang ),김유아 ( You Ah Kim ),박병준 ( Byoung Jun Park ),강학희 ( Hakhee Kang ) 대한화장품학회 2020 대한화장품학회지 Vol.46 No.3

알로에 베라(Aloe barbadensis Miller)는 예로부터 화상이나 상처, 습진 등의 다양한 피부 질환을 개선하기 위해 사용해 왔다. 이러한 효능은 알로에가 가지고 있는 비타민, 무기질, 당, 페놀 물질, 지방산. 아미노산 등의 다양한 성분에 의한 것으로 보고가 되었다. 알로에는 극한의 환경에서 스스로를 보호하기 위해서 성분을 변화시키며, 이로 인해 색깔이 녹색에서 적색으로 변화한다. Aloe-emodin은 알로에속 식물의 대표적인 페놀성 물질로 항산화 및 항염 활성을 나타낸다. 그러나 지금까지 알로에의 활성 물질인 알로에-에모딘을 증가시키고 알로에의 색상을 변화시키는 공정 개발에 대한 연구는 보고되지 않았다. 따라서 본 연구의 목적은 aloe-emodin 함량을 증가시키고 알로에의 항산화 및 항염 활성을 증대시키는 핑크 알로에 제조공정을 개발하는 것이다. 이를 위해 알로에를 적정 조건으로 가온한 결과 핑크 알로에는 일반 알로에 대비 aloe-emodin 함량이 증가하였으며, 항산화 활성 증대, NO 생성 억제, 세포 재생 촉진 등의 효과를 나타내었다. 본 연구를 통해 화장품 분야에서 핑크 알로에의 신규 항노화 소재로 활용성을 확인하였다. Aloe vera (Aloe barbadensis Miller) has been used since ancient times to improve various skin diseases such as burns, wounds, and eczema. It has been reported that Aloe vera contains vitamin, enzyme, mineral, sugar, phenolic compound, fatty acid and amino acid. Aloe vera changes its color from green to red under the extreme thermal and arid climate to protect itself. These morphological changes induce variation of composition such as increasing of aloe-emodin content. Aloe-emodin is one of the major anthraquinone in aloe family plants. Since aloe-emodin contains a polyphenolic structure, this compound may be responsible for the reported antioxidant and anti-inflammatory effects of aloe. However, there is no research on the process of increasing the compounds of Aloe vera. Therefore, the purpose of this study is to develop a pink aloe manufacturing process that increases the aloe-emodin content and enhances the antioxidant and anti-inflammatory activities of aloe. As a result of heating aloe under appropriate conditions, pink aloe increased aloe-emodin content compared to general aloe, and exhibited effects such as increasing antioxidant activity, inhibiting NO production, and promoting cell regeneration. Through this study, the applicability of pink aloe as a new anti-aging material in the cosmetic field was confirmed.

청년기 자녀의 아버지와의 커뮤니케이션과 자아개념에 관한 연구

이경주(Kyung Ju Lee),신효식(Hyo Shick Shin) 가정과삶의질학회 1990 가정과삶의질연구 Vol.8 No.2

수혈로 유발된 급성 폐 손상 2예

이경주 ( Kyoung Ju Lee ),김혜옥 ( Hye Ok Kim ),김정하 ( Jung Ha Kim ),하은실 ( Eun Sil Ha ),정진용 ( Jin Yong Jung ),이승현 ( Seung Hyeun Lee ),김세중 ( Se Joong Kim ),주문경 ( Moon Kyung Ju ),이은주 ( Eun Joo Lee ),강은해 ( Eun H 대한결핵 및 호흡기학회 2006 Tuberculosis and Respiratory Diseases Vol.61 No.5

Transfusion related acute lung injury (TRALI) is a serious, potentially life-threatening complication of transfusion therapy that is sometimes under diagnosed and under reported. Patients with TRALI present with dyspnea/respiratory distress and fever. The symptoms, signs and chest radiological findings in TRALI are similar to transfusion associated circulatory overload, which makes it is difficult to distinguish it from circulatory overload. Although the mortality rate in cases of TRALI is relatively low, TRALI is the third most common cause of fatal transfusion reactions next to ABO blood type incompatibility and hepatitis. Mild-to-moderate cases of TRALI may be misdiagnosed as volume overload. Recently, we encountered two cases where the patients suffered from dyspnea and fever after a transfusion. and review of the relevant literature. (Tuberc Respir Dis 2006; 61: 473-478)