Antioxidant Activities of Aqueous Extracts from Three Cultivars of Guava Leaf

정창호,배영일,박수정,이시경,허선진 한국식품과학회 2012 Food Science and Biotechnology Vol.21 No.6

In order to obtain basic data required for utilization of guava leaf as a functional substance, the antioxidant activities of aqueous extracts from 3 cultivars of guava leaf (‘Apple color’, ‘Ruby’, and ‘Safeda’) were examined. The total phenolic contents of the aqueous extracts ranged from 257.38 to 293.25 mg/g gallic acid equivalents. DPPH, ABTS, reducing power, ferric reducing antioxidant power (FRAP), ferric thiocyanate (FTC), and malondialdehyde (MDA) assays indicated that the aqueous extract of the ‘Ruby’ cultivar was the most potent radicalscavenger and reducing agent compared to the other 2cultivars. Therefore, this study verified that aqueous extract from the ‘Ruby’ cultivar possessed strong antioxidant activity that correlated to its high level of phenolics,particularly gallic acid. In conclusion, the aqueous extract of the ‘Ruby’ cultivar of guava leaf may be utilized as an effective source of functional food materials, including natural antioxidants.

진공창호시스템 부위별 표면온도 분포 및 결로 발생 특성에 관한 실험연구

정창호(Jeong, Chang-Ho),박재성(Park, Jae-Sung),여명석(Yeo, Myoung-Souk),김광우(Kim, Kwang-Woo) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.10

In this study, characteristics of the surface temperature and condensation on a window were assessed, using vacuum insulated glass units produced by the in-vacuum chamber method. For this purpose, mock-up test was performed, based on the result of preliminary study about the test methods of the surface condensation resistance performance of a window system. A general double glass window(DG Window) was selected as an alternative for comparison. As a result, in the same location, the surface temperature of the vacuum insulated glass window(VIG Window) was 4~6 ℃ higher, in comparison with a general DG window. The surface temperature on the center of glass in the VIG window was higher than that on the frame, because of the thermal performance of the vacuum insulated glass(VIG). On the other hand, the surface temperature on the edge of glass in the VIG window was still lower (0.9~1.5℃), than that on the frame. Therefore, for improvement of the surface temperature distribution in a VIG window, a strategy to reduce heat loss in the glass-intersection, as well as the application of a frame with equal or greater thermal performance, in comparison with the vacuum insulated glass, are required. Under the condition of room air temperature 20℃ and relative humidity of 50%, the calculated outdoor air temperature was .21.2℃, when indoor surface condensation on the VIG window begins to occur. Analyzing based on the standard weather data for Seoul, it was expected that surface condensation on the VIG window would not occur.

시판 비파나무잎차의 영양성분 및 항산화 활성

정창호,김일훈,심기환,배영일 경상대학교 농업생명과학연구원 2011 농업생명과학연구 Vol.45 No.4

본 연구에서는 시판 비파나무잎차의 영양성분 분석 및 열수 추출물을 이용하여 항산화 효과를 조사하였다. 일반성분은 수분 5.34%, 조단백 8.38%, 조지방 13.26%, 가용성 무질소물 46.21%, 조섬유 19.24% 및 조회분 7.57%순으로 함유하고 있었다. 비타민 C 함량과 총페놀 함량은 각각 0.47 mg/100 g 및 42.55 mg/g이였다. 무기성분은 Ca, K 및 Mg 순으로 높게 나타났으며, 그 함량은 각각 1,624.01, 1,099.66 및 192.70 mg/100g이었다. 비파나무잎차의 아미노산 분석 결과 glutamic acid (565.98 mg/100 g)가 가장 높게 함유되었고, 반면 가장 낮은 함량은 cystine (12.97 mg/100 g)이였다. 시판 비파나무잎차 열수 추출물 농도 1,000 μg/mL를 기준으로 했을 때 각각 86.87%와 98.14%의 ABTS 및 DPPH 라디칼 소거활성을 보였으며, 환원력과 ferric reducing antioxidant power (FRAP)는 농도 의존적 항산화 활성을 보였다. 따라서 시판 비파나무잎차는 항산화제와 같은 기능성 식품 소재로 이용가능성이 높을 것으로 생각된다. Nutritional components and antioxidant activities of commercial loquat leaf tea (CLLT) were evaluated. Proximate compositions were as follows; moisture 5.34%, crude protein 8.38%, crude fat 13.26%, nitrogen free extract 46.21%, crude fiber 19.24% and crude ash 7.57%, respectively. Ascorbic acid and total phenolics content of CLLT was 0.47 mg/100 g and 42.55 mg/GAE g, respectively. Mineral elements were Ca 1,624.01 mg/100 g, K 1,099.66 mg/100 g, and Mg 192.70 mg/100 g, respectively. Amino acid contents of CLLT were very rich in glutamic acid 565.98 mg/100 g and deficient in cystine 12.97 mg/100 g. The 2,2'-azino-bis (3-ethylbenzthiazoline-6- sulfonic acid) diammonium salt (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activities of hot water extract from CLLT were 72.51% and 90.11%, respectively at a concentration of 1,000 μg/mL. Reducing power and ferric reducing antioxidant power (FRAP) of hot water extract from CLLT were increased in a dose dependent manner. Therefore, these results suggest that the hot water extract of CLLT possess antioxidant activities and thus it has great potential as a source for functional food such as natural antioxidant.

청각장애인을 위한 LED 천장등

정창호 한국공학교육학회 2017 공학교육동향 Vol.24 No.1

문화재 특수성 측면에서 바라본 문화재보수정비 국고보조사업 실태와 개선방안

정창호,박치성,한승준 한국국정관리학회 2014 현대사회와 행정 Vol.24 No.2

이 글은 문화재보수정비 국고보조사업의 실태와 개선방안을 논하는 탐색적 연구로서 기존에 일반국고보조사업의 집행부진 원인을 분석한 윤기웅 공동성(2012) 연구의 분석틀을 바탕으로 문화재보수관리사업이 지니는 특수성이 집행과정에 어떻게 영향을 주는지 비교분석함으로써 일반국고보조사업과의 차별성을 논하였다. 문화재보수정비의 집행부진 원인은 문화재 자체가 지니는 정책목표인 ‘원형보존’을 달성하기 위해 요구되는 집행과정에서의 특수성으로부터 도출되었다. 여기에는 비용산정 부정확성, 문화재청의 계획변경, 지자체의 설계변경, 이해당사자간 협의지연, 계절적 요인에 의한 공사중지, 기타 돌발상황 등이 일반 국고보조사업과 다른 것으로 나타났다. 또한 주요 집행률 부진요인 분석결과 문화재특성에 따른 설계변경이 가장 큰 장애요인인 것으로 나타났으며, 문화재 유형에 따른 특수한 집행부진원인 양상도 파악되었다.

디스플레이 노광장비를 대체하는 임프린트 장비기술

정창호,양재영,이진향,최정욱,김덕수,박춘성,Jeong, Chang-Ho,Yang, Jae-Yeong,Lee, Jin-Hyang,Choe, Jeong-Uk,Kim, Deok-Su,Park, Chun-Seong 한국정보디스플레이학회 2009 인포메이션 디스플레이 Vol.10 No.5

기계식 제동 방식을 갖는 에스컬레이터의 과속역행 방지장치 성능평가

정창호,정의창,조종두 대한기계학회 2022 大韓機械學會論文集A Vol.46 No.11

In this study, a mechanical brake (also known as a reverse-driving prevention device) is installed in an escalator to prevent, reduce, and mitigate escalator overspeed or reverse-driving accidents. Because it is a safety device that requires excellent braking performance and structural integrity, evaluating the strength and safety of parts is necessary to ensure the reliability of the device. However, due to the unique characteristics of the device, measuring the stress of major parts is difficult. In this study, the structural safety of the mechanical brake when the escalator overspeeds or a reverse-driving event occurs is verified using a finite element method. The study showed that the maximum stress generated in the entire system under braking conditions was 37.3 MPa and that the minimum safety factor was 3.8, confirming the structural safety of the system. 과속역행 방지장치는 에스컬레이터에서 발생할 수 있는 과속 혹은 역주행 사고에 대한 예방·감소·완화의 목적으로 설치되는 장치다. 해당 장치는 안전을 목적으로 설치되는 장비이며 뛰어난 제동성능과 구조안전성이 요구되므로, 제품의 신뢰성 확보를 위한 부품의 강도 및 안전성 평가가 반드시 필요하다. 그러나 과속역행 방지장치의 특성상 다양한 구조요소가 결합되므로 신뢰성 평가를 위하여 주요부위에서 응력을 측정하는 것은 쉽지 않다. 본 연구에서는 유한요소 해석을 활용하여 에스컬레이터의 과속 혹은 역주행 상황 발생 시 과속역행 방지장치의 구조안전성 평가를 수행한다. 주요연구 결과로 과속 및 역주행 제동 상황 시 전체 시스템에서 발생한 최대응력은 37.3 MPa, 최저 안전율은 3.8로 해당 시스템의 구조적 안전성을 확인하였다.

지방 소도읍 지역 생활환경 분석에 관한 연구 -하동 시장을 중심으로-

정창호,이태곤,안재락 건국대학교 부동산도시연구원 2016 부동산 도시연구 Vol.8 No.2

Eup in South Korea has been functioning as an economic, social and cultural-center of a local town. But the industrialization and the development of modern transportation system had led to the gradual deterioration of this small town. It had impacted on the role of traditional market which is usually located in the center of Eup. The purpose of this study is to find the possible means to restructure the function of the traditional markets located in the center of Ha-dong eup. To investigate it, we analyzed the deterioration phenomenon of eup, the current status of traditional markets, and outcome of the revitalization policies. Traditional markets face the issues of the functional deterioration and inefficient space use. Eup still takes up for a large area of city center and it speeds up the deterioration of small towns and town center. Therefore, it is required to change the perspective of traditional market. Rather than commercial space, it should be regarded as a public space with community centric function. The government policies for revitalization should focus more on enhancing the culture, living environment, welfare, tourism, and service functions. 본 연구는 군단위의 중심시가지인 읍의 쇠퇴현황과 육성정책, 특히 전통시장에 대한 지원 실태를 분석하고, 해당지역을 비교적 잘 알고 있는 공무원을 대상으로 하는 전문가 설문조사와 읍의 중심 시가지이자 전통시장인 하동시장 주변의 통행량 조사를 통해 지방소도시의 중심지인 읍에서의 생활패턴과 지역에 대한 인식을 분석하고자 하였다. 연구대상지는 경남의 군지역에서 가장 규모가 작아 중심성이 약한 지역인 하동읍을 선정하였다.

원발성 여성 요도 종양의 임상특성 및 추적관찰

정창호,류현열 고신대학교 의학부 2004 高神大學校 醫學部 論文集 Vol.19 No.1

Background : Female urethral lesions encompass a spectrum of entities that have significance in clinical urology. With that, female urethral lesions have rarely been reported and the differential diagnosis between benign and malignant lesions has not been established. I investigate retrospectively the incidence and the clinical presentations of female urethral lesions by my experience about 20 cases of the female primary urethral tumor. I also analyze the data to determine the optimum procedure for diagnosis and therapy. Method : The study included 20 patients with female urethral tumor treated by surgical procedure at Masan Samsung hospital of Sungkyunkwan University between Jan. 1994 to Apr. 2001. We investigated the clinical aspect of the female urethral tumor by symptom of each lesion, the spread of the patient's age, the method of the diagnosis and treatment. The preoperative evaluation included a thorough clinical history, physical examination, urinalysis, urine cytology, cystourethroscopy, and the radiologic studies, including voiding cystourethrography, retrograde urethrography, pelvic ultrasonography, pelvic CT or MRI. Results : The age range of the patients, who were surveyed for the 20 cases of the primary tumor, was between 25.2 and 74.6 (mean age 46.9 years), and 8 of them were in the period of menopause. We can inspect urethral diverticulum and we can treated it through diverticulectomy only. 4 cases were necessary to use Martius interposition graft when the path between urethra and the diverticulum was large. 2 cases had the stress incontinence postoperatively and there were necessary anterior vaginal wall sling procedure. The tumor was removed under transvaginal approach in urethral leiomyoma and leiomysarcoma and had not seen a significant morbidity. Urethral transitional cell carcinoma was found that it metastasized to the inguinal lymph nodes and distant metastasis to lung and bone after radical total cystourethrectomy. After the surgical excision of the benign urethral lesions, there would be no relapse or progression to malignancy. Conclusion : Urethral masses are essentially needed radiologic or endourologic procedure and pathologic examination due to possible development of a malignant tumor even though it is rare. A large scale of the urethral tumor like the leiomyoma of urethral diverticulum could be cured and safely managed by surgical excision, but the preventive procedure of the stress incontinence was needed. Finally it is important to perform auxiliary radiotherapy or chemotherapy with radical cystourethrectomy in female urethral malignant tumor to prevent the disease progression.

적색 및 녹색 풋고추의 화학성분

정창호,심기환 경상대학교 농업생명과학연구원 2001 농업생명과학연구 Vol.35 No.-

품종에 따른 전통 향신료로서 이용가치를 결정하고 한국인의 식습관에 맞는 고추의 품질을 개선하기 위하여 적색 및 녹색 풋고추의 화학성분을 비교, 분석한 결과 일반성분은 적색 풋고추와 녹색 풋고추에서 총당이 각각 6.87%와 4.63%로 나타났으며, 무기성분은 K 및 P이 적색 풋고추와 녹색 풋고추에서 370.12 ㎎%, 162.28 ㎎% 및 44.36 ㎎%, 38.80 ㎎%로 각각 높게 나타났고, 비타민 C는 적색 풋고추에서는 169.77 ㎎%, 녹색 풋고추에서는 72.45 ㎎%로 각각 나타났다. 유리당 함량은 적색 풋고추와 녹색 풋고추에서 fructose(1,852.0 ㎎%, 216.4 ㎎%)와 galactose(1,443.7 ㎎%, 292.2 ㎎%)가 높게 나타났으며, 유기산의 경우 적색 풋고추에서는 citric acid가 672.40 ㎎%, 녹색 풋고추에서는 succinic acid가 311.49 ㎎%로 높게 나타났다. 지방산 조성은 적색 풋고추와 녹색 풋고추에서 linoleic acid가 각각 32.89%와 36.20%로 높게 나타났으며, 아미노산 함량은 적색 풋고추에서는 aspartic acid가 237.4 ㎎%로 높게 나타났고, 녹색 풋고추에서는 glutamic acid가 237.2 ㎎%로 가장 높게 나타났다. 색도는 녹색 풋고추는 적색 풋고추에 비해 L값은 높았으나 a, b값은 낮게 나타났다. To study the availability of the Capsicum annuum. L as traditional herbs and in order to improve quality, the properties of chemical components were investigated. Among general components of unripe red and green pepper, total sugars portions from unripe red and green pepper took 6.87% and 4.63%, respectively. The mineral component contents of the unripe red and green pepper were K(370.12 ㎎%, 162.28 ㎎%) and P44.36 ㎎%, 38.80 ㎎%), respectively. The contents of vitamin C was 169.77 ㎎% for unripe red pepper and 72.45 ㎎% for unripe green pepper and that of free sugar was 1,852.0 ㎎% of fructose for unripe red pepper and 292.2 ㎎% of galactose for unripe green pepper and that of organic acid was 672.40 ㎎% of citric acid for unripe red pepper and 311.49 ㎎% of succinic acid for unripe green pepper. The highest fatty acids in unripe red and green pepper was linoleic acid and its composition was 32.89% and 36.20%, respectively. The highest component of total amino acids in unripe red and green pepper was aspartic acid(237.4 ㎎%) and glutamic acid(237.0 ㎎%), respectively. Unripe red pepper showed higher Hunter parameter a and b value and lower L value than unripe green pepper.