Brain SPECT 영상의 Attenuation Correction 방법들에 대한 비교

조진우,김창호,나수경,이귀원,Jo, Jin U,Kim, Chang Ho,Na, Soo Kyung,Lee, Gui Won 대한핵의학기술학회 2012 핵의학 기술 Vol.16 No.2

이 연구의 목적은 Brain SPECT (Single Photon Emission Computed Tomography)의 Non-attenuation correction (AC-non) 영상에 대한 attenuation correction(AC) 방법 중 Chang's method와 CT based attenuation correction(AC-CT) 사이의 count를 비교하기 위함이다. phantom study는 증류수로 채워진 hoffman 3D phantom에 $^{99m}Tc$ 37Mbq을 투여하였고, patient study는 normal volunteer에 $^{99m}Tc$-HMPAO 750Mbq를 정맥주입하고 Siemens사의 Symbia T6로 Brain SPECT 영상을 획득하였고 뇌 정량 분석을 하였다. 각각의 방법들을 적용한 transverse image는 같은 위치에서 재구성 되었으며 각각 10, 20, 30번째 slice에서 6개의 region of interest(ROI)를 그려 AC-non 과 AC-CT 그리고 Chang's method의 count를 비교하였다. phantom study에서 AC-non, AC-CT, Chang's method의 각각 평균 count는 $4606.8{\pm}511.3$, $16794.6{\pm}2429.4$, $8752.6{\pm}896.5$이었으며 patient study에서 $5460.8{\pm}519.6$, $15320{\pm}1171.6$, $12795{\pm}1422.1$이었다. phantom study에서 AC-CT와 AC-non 사이의 비는 3.70이고 Chang's method와 AC-non 사이의 비는 1.92였으며 patient study에서는 각각 2.85, 2.38이었다. 우리는 이 연구를 통하여 AC-CT가 Chang's method보다 더 높은 AC을 해준다는 걸 알 수 있었다. 그리고 Chang's method는 patient study에서의 AC 값이 phantom study에서의 AC값보다 더 높다는 것을 알 수 있었다. brain SPECT/CT를 시행하는 경우 scatter correction을 같이 시행하고 bone에 의한 감쇠 정보를 반영할 수 있는 AC-CT가 chang's method보다 정확하다 할 수 있겠다. Purpose : The purpose of this study was to compare count between Chang's method and CT-based attenuation correction (AC-CT) among the attenuation correction (AC) methods for non-attenuation correction (AC-non) images of Brain SPECT (Single Photon Emission Computed Tomography). Materials and Methods : We injected $^{99m}Tc$ 37Mbq in a Hoffman 3D phantom filled with distilled water in the phantom study, and injected intravenously $^{99m}Tc$-HMPAO 740Mbq in a normal volunteer in the patient study, and then obtained Brain SPECT images with Symbia T6 of Siemens and conducted quantitative brain analysis. Transverse images to which each method was applied were rebuilt at the same position, and 6 regions of interest (ROI) were drawn on each of Slice No. 10, 20 and 30 and then the counts of AC-non, AC-CT and Chang's method were compared. Results : The mean counts of AC-non, AC-CT and Chang's method were $4606.8{\pm}511.3$, $16794.6{\pm}2429.4$, and $8752.6{\pm}896.5$, respectively, in the phantom study and $5460.8{\pm}519.6$, $15320{\pm}1171.6$ and $12795{\pm}1422.1$, respectively, in the patient study. In the phantom study, the ratio of AC-CT to AC-non was 3.70 and the ratio of Chang's method to AC-non was 1.92, and in the patient study, they were 2.85 and 2.38, respectively. Conclusion : From this study, we found that AC-CT makes higher AC than Chang's method. In addition, when Chang's method was used, AC in the patient study was higher than that in the phantom study. These results need to be considered also in other examinations.

Causes and Predictive Factors Associated with “Diagnosis Changed” Outcomes in Patients Notified as Tuberculosis Cases in a Private Tertiary Hospital

( Byung Ju Kang ),( Kyung Wook Jo ),( Tai Sun Park ),( Jung Wan Yoo ),( Sei Won Lee ),( Chang Min Choi ),( Yeon Mok Oh ),( Sang Do Lee ),( Woo Sung Kim ),( Dong Soon Kim ),( Tae Sun Shim ) 대한결핵 및 호흡기학회 2013 Tuberculosis and Respiratory Diseases Vol.75 No.6

Background: The aim of our study was to evaluate the “diagnosis changed” rate in patients notified as tuberculosis (TB) on the Korean TB surveillance system (KTBS). Methods: A total of 1,273 patients notified as TB cases on the KTBS in one private tertiary hospital in 2011 were enrolled in the present study. Patients were classified into three groups: “diagnosis maintained”, “diagnosis changed” (initially notified as TB, but ultimately diagnosed as non-TB), and “administrative error” (notified as TB due to administrative errors). Results: Excluding 17 patients in the “administrative error” group, the “diagnosis maintained” and “diagnosis changed” groups included 1,097 (87.3%) and 159 patients (12.7%), respectively. Common causes of “diagnosis changed” were nontuberculous mycobacterial (NTM) disease (51.7%, 61/118), and pneumonia (17.8%) in cases notified as pulmonary TB, and meningitis (19.5%, 8/41) and Crohn`s disease (12.2%) in cases notified as extrapulmonary TB. Being older than 35 years of age (odds ratio [OR], 2.18) and a positive acid-fast bacilli stain (OR, 1.58) were positive predictors and a TB-related radiological finding (OR, 0.42) was a negative predictor for a “diagnosis changed” result via multivariate logistic regression analysis in pulmonary TB cases. Conclusion: Because of a high “diagnosis changed” rate in TB notifications to the KTBS, the TB incidence rate measured by the KTBS may be overestimated. Considering the worldwide trend toward increased NTM disease, the “diagnosis changed” rate may increase over time. Thus, when reporting the annual TB notification rate in Korea, the exclusion of “diagnosis changed” cases is desirable.

펠던크라이스 기법, 탄성밴드 운동 및 복합운동 적용이 현대무용전공자의 체간근력에 미치는 영향

김채수(Kim Chae-Soo),권혜영(Kwon Hye-Young),이원재(Lee Won-Jae),조창모(Jo Chang-Mo),김진환(Kim Jin-Hwan),주성범(Ju Sung-Bum),이미경(Lee Mi-Kyoung) 한국체육과학회 2011 한국체육과학회지 Vol.20 No.1

This study is carried out to examine the effect of applying Feldenkrais method, elastic band training and combined training on trunk muscle. The subjects of this study were 32 modern dance majors and they were divided into four groups which consists of 8 peoples each, Feldenkrais method group(modern dance + Feldenkrais method), elastic band training group(modern dance + elastic band training), combined training group(modern dance + Feldenkrais method + elastic band training), and control group(modern dance). Measurement variables which are trunk muscle were measured before training, and after 4 and 8 weeks training and the results are as follow: In the left muscle strength change at Centaur 0°, Feldenkrais method group, elastic band training group and combined training group showed significant increase after 8 weeks training compared to before training. In the right muscle strength change, Feldenkrais method group and combined training group had significant increase after 8 weeks training. In the left muscle strength change at Centaur 45°, Feldenkrais method group and combined training group showed significant increase after 8 weeks training compared to before training and after 4 weeks training. Also elastic band training group showed significant increase after 8 weeks training compared to before training. In the right muscle strength change, Feldenkrais method group and elastic band training group significantly increased after 8 weeks training compared to before training. In the left muscle strength change at Centaur 90°, Feldenkrais method group and combined training group showed significant increase after 4 and 8 weeks training compared to before training. In the right muscle strength change, Feldenkrais method group showed significant increase after 4 and 8 weeks training compared to before training, and elastic band training group significantly increased after 8weeks training compared to before training. In the left muscle strength change at Centaur 135°, there was no significant changes. In the right muscle strength change, elastic band training group and combined training group showed significant increase after 8 weeks training compared to before training. In the left muscle strength change at Centaur 180°, combined training group showed significant increase after 4 and 8 weeks training compared to before training. In the right muscle strength change, combined training group showed significant increase after 4 and 8 weeks training compared to before training. From above results, applying 8 weeks regular program of Feldenkrais method, elastic band training and combined training to modern dance majors showed positive changes on improvement of trunk muscle strength and physical strength. Also this study implemented to verify the effects of trunk muscle strength and body balance through supplementary training program, and showed the effects in the training group and control group after 8 weeks trunk muscle strengthening program. Feldenkrais method, elastic band training and combined training are very effective to improve trunk muscle strength of modern dance majors so that continuous implementation and application of these effective training program shall be provided for strengthening trunk muscle.

문헌 자료를 통해 본 조선의 원예 문화

조창록 ( Chang Roc Jo ) 동방한문학회 2013 東方漢文學 Vol.0 No.56

화훼는 오랜 옛날부터 제수용 과실, 건물의 조경 등 실용적 필요성과 함께 문학의 소재로 애호를 받아왔다. 조선의 지식인들은 매화, 국화, 난초, 소나무, 대나무 등을 소재로 다수의 시문(詩文)과 서화(書畵)를 남겼고, 때로는 개인적 취향에 따라 전문적인 화훼서(花卉書)를 저술하거나 화원기(花園記) 등을 쓰기도 하였다. 특히 18세기 후반에서 19세기 초에는 문인지식층 사이에서 원예취미가 확산되면서 화원을 가꾸는 풍속이 성행하였는데, 유행이라고 할 만큼 많은 인물들이 화훼를 애호한 것으로 알려져 있다. 본고는 왕실의 원림(園林)을 관리하던 장원서(掌苑署) 기록들과 조선 시대를 통틀어 민간에서 쓰여진 전문 화훼서를 일별해서 살펴봄으로써, 궁중의 화초에 대한 인식과 민간의 원예 지식이 어떻게 변모해 나가는가에 대해 살펴본 것이다. 여기서 논의된 내용을 정리해 보면 다음과 같다. 첫째, 사료(史料)에 나오는 장원서 관련 내용들을 보면, 조선의 궁실에서는 일찍부터 온실을 운영하였으며, 개화시기를 조절하는 등의 재배 기술이 알려져 있었다. 그러나 군주가 화초를 애호하는 일은 자칫 완물상지에 빠질 수 있다는 점, 또 백성들을 수고롭게 한다는 점, 꽃을 빨리 피게 하는 것은 천지의 조화를 거스르는 것이라는 점에서 꺼려야할 일로 인식되었음을 알 수 있다. 둘째, 민간 화훼서의 경우, 박흥생의 『촬요신서』에 나오는 13종의 화목에서 장지연의 『위원화원지』까지 꽃의 품종은 지속적으로 늘어나서 약 160종에 이르고 있음을 알 수 있다. 그리고 이때 화목은 초·목을 구분하거나 꽃이 피느냐 안 피느냐를 구분하지 않고, 花卉라는 이름으로 함께 애호되어 왔음을 알 수 있다. 셋째, 조선의 화훼 문화는 본래적으로 관물성신(觀物省身), 지지의성(知至意誠)의 차원에서 자연의 조화를 깨닫고 인간의 덕성을 돌이키게 하는데 그 목적이 있었다. 이런 의미에서 꽃은 물론 괴석이나 화분의 배치 등도 원예 문화에 포함된다. 그러나 조선후기에 오면 점차 이러한 인식이 옅어지고, 최화법(催花法)과 환화법(幻花法) 등 인공이 하늘의 조화를 빼앗거나 변환시키는 재배 기술이 긍정적으로 수용되고 있음을 알 수 있다. Floriculture had been loved as the material of literature for a long time. Intellectuals of Joseon had made many poetry and paintings about apricot, chrysanthemum, orchid, pine, bamboo and so on. Sometimes, they wrote professional floriculture books or flower garden accounts. Especially from the late 18th Century to the early 19th Century, many literary persons enjoyed gardening as a hobby, so floriculture had been almost in vogue. This article examined professional floriculture books which were read among people and records about Jangweonseo (掌苑署) that managed the gardens and forests of royal family to understand how the court`s recognition on flower and the floriculture knowledge of people had changed. Followings are the summary of contents discussed in this article. From the historical material about Jangweonseo, it was found that Joseon`s court early had operated greenhouses and knew how to control the bloom time but the court took floriculture as something to avoid because loving flower too much could make rulers pay little attention to their own tasks and make people painful and making flower bloom early went against the harmony of nature. Civil floriculture books stretched their contents from thirteen kinds of flowers from 『Chwalyosinseo』 (撮要新書) to the species of 『Wiwonhwaweonji』 (韋庵花園志), amounting to 160 or more species. Those species were called just ``hwahwe``, not divided into plants and trees, or bloomimg or non-blooming. The floriculture of Joseon originally was subject to realizing the harmony of nature and returning to human virtue, so bizarre stones and flowerpot arrangement were also the part of floriculture. However, in the late Joseon, such understanding had thinned and artificial culturing techniques, which could change the blooming time and flowers` color intentionally, had developed by personal tastes and industrial needs.

주자(朱子)의 복서역학(卜筮易學)에 대한 연구(硏究)

송인창 ( In Chang Song ),조기원 ( Gi Won Jo ) 한국동서철학회 2011 동서철학연구 Vol.62 No.-

『주역』을 연구하려면 가장 먼저 복서卜筮와 점占에 대한 탐색을 피할 수 없다. 복서에 기반한 『주역』은 동양철학의 원천이기 때문이다. 복서의 뿌리와 원형을 제대로 연구하지 않고는 『주역』의 본질에 접근할 수 없다. 복서는 넓은 의미에서 보면 동양인의 정신세계를 포괄하는 사유의 모델인 동시에 행위의 규범이었다. 주역사에서 주자朱子(1130-1200)는 최정상의 학자로 손꼽히는 인물이다. 그는 다양한 학문의 집대성자답게 역학사상 역시 상수역象數易과 의리역義理易과 복서역卜筮易이라는 세 갈래의 관점을 하나로 통합하였다. 그렇다고 복서역만이 주자 역학의 전모는 아니다. 그의 역학은 다양한 스펙트럼으로 조명되어야 마땅하기 때문이다. 이 논문은 주자의 역학사상 가운데 복서관을 중심으로 어떻게 상수론과 의리론을 통합하고 있는가의 문제를 살피는 것을 목적으로 한다. 하지만 대부분의 학자들은 주자의 역학을 성리학性理學의 입장에서 의리역학 혹은 상수역학의 관점에서만 다루어왔다. 주자가 『주역』의 출발과 본질이 복서라고 강조했음에도 불구하고 복서역 자체에 대해서는 아직까지 체계적인 연구는 이루어지지 않았다고 해도 과언이 아니다. 비록 주자가 복서와 상수를 강조했더라도 도덕이 배제된 『주역』은 한갓 술수론에 지나지 않는다는 것을 의식하고 『주역』의 윤리설을 도입한다. 의리역은 하늘과 인간이 하나됨을 겨냥한다. 의리가 빠진 복서는 점치는 용도에 불과하고, 의리가 배제된 상수 역시 공허한 관념론에 불과하기 때문에 복서에서 의리로, 또는 상수에서 의리로의 지향은 필연의 과정이라 할 수 있다. 따라서 주자는 복서의 논리를 중심으로 상수의 수학적 엄밀성을 도입하여 합리성을 보강했으며, 또한 이를 바탕으로 도덕의 세계로 나아가는 디딤돌을 마련하였다. 더 나아가 주자는 복서를 넘어 윤리의 세계를 지향하여 주역관을 근거로 성리학을 정립하였던 것이다. The Book of Changes is the most valuable classic that contains Confucian view of the world and life including metaphysics, epistemology, and the theory of value. Zhu Xi(1130-1200), considered to be the best scholar throughout the history of the Book of Changes, complied various teachings and synthesized three standpoints of the thoughts in the Book of Changes-the XiangshuYi(象數易), the YiliYi(義理易), and the BushiYi(卜筮易)-into one integrated point of view. The purpose of this dissertation is to study how Zhu Xi has synthesized the image and number theory with the morality and rationality theory based upon the divination theory. Although greatly emphasized the importance of the Bushi(卜筮) with the image and number, Zhu Xi realized that the Book of Changes lacking the value of morality would be nothing but a petty artifice. Therefore, he adopted ethics. The ultimate purpose of the moral and rational principle is to bring the oneness of heaven and humanity. Since the divination without morality and rationality would be just a means of fortunetelling and the image and number principle without morality and rationality would be also a vacant idealism, it would be inevitable for both BushiYi and XiangshuYi to pursue the moral and rational principle. For that reason, Zhu Xi tried to strengthen rationality of the Book of Changes in accordance with the logic of the Bushi by adopting mathematical precision, and it successfully served as a stepping stone for the world full of morality. Furthermore, this let Zhu Xi aim the world of m(orality beyond the understanding the divination and enabled him to establish Neo-Confucianism from his standpoint of the Book of Changes. Finally, the key to approach the true quality of Zhu Xi`s the Book of the Changes would be to figure out the core part of his study which is to combine the morality and rationality with the image and number based upon the BushiYixue(卜筮易學).

인덕터의 DC 바이어스 특성을 고려한 대용량 DC-DC 컨버터의 손실계산

조영창(Young-Chang Jo),최주엽(Ju-Yeop Choi),정승기(Seung-Ki Jung),최익(Ick Choy),송승호(Seung-Ho Song) 대한전기학회 2011 전기학회논문지 Vol.60 No.4

It is necessary to accurately predict converter losses for optimized design of a high-power DC-DC converter. The losses of switching devices and inductor among the elements of the converter take significantly greater proportion. The current ripple will be determined by the size of the inductance and this inductance value varies depending on the DC amount of inductor current. As the inductance changes according to load current, the change influences not only the inductor loss itself but also the total converter loss. In this paper, for more accurate design of a bi-directional DC-DC converter for 30㎾-class energy storage system, more accurate computational model is proposed considering inductance variation according to the load current change. The inductance changes using variable magnetic cores are verified and converter efficiency is tested through simulations and experiments.

Causes and Predictive Factors Associated with "Diagnosis Changed" Outcomes in Patients Notified as Tuberculosis Cases in a Private Tertiary Hospital

Kang, Byung Ju,Jo, Kyung-Wook,Park, Tai Sun,Yoo, Jung-Wan,Lee, Sei Won,Choi, Chang-Min,Oh, Yeon-Mok,Lee, Sang-Do,Kim, Woo Sung,Kim, Dong Soon,Shim, Tae Sun The Korean Academy of Tuberculosis and Respiratory 2013 Tuberculosis and Respiratory Diseases Vol.75 No.6

Background: The aim of our study was to evaluate the "diagnosis changed" rate in patients notified as tuberculosis (TB) on the Korean TB surveillance system (KTBS). Methods: A total of 1,273 patients notified as TB cases on the KTBS in one private tertiary hospital in 2011 were enrolled in the present study. Patients were classified into three groups: "diagnosis maintained", "diagnosis changed" (initially notified as TB, but ultimately diagnosed as non-TB), and "administrative error" (notified as TB due to administrative errors). Results: Excluding 17 patients in the "administrative error" group, the "diagnosis maintained" and "diagnosis changed" groups included 1,097 (87.3%) and 159 patients (12.7%), respectively. Common causes of "diagnosis changed" were nontuberculous mycobacterial (NTM) disease (51.7%, 61/118), and pneumonia (17.8%) in cases notified as pulmonary TB, and meningitis (19.5%, 8/41) and Crohn's disease (12.2%) in cases notified as extrapulmonary TB. Being older than 35 years of age (odds ratio [OR], 2.18) and a positive acid-fast bacilli stain (OR, 1.58) were positive predictors and a TB-related radiological finding (OR, 0.42) was a negative predictor for a "diagnosis changed" result via multivariate logistic regression analysis in pulmonary TB cases. Conclusion: Because of a high "diagnosis changed" rate in TB notifications to the KTBS, the TB incidence rate measured by the KTBS may be overestimated. Considering the worldwide trend toward increased NTM disease, the "diagnosis changed" rate may increase over time. Thus, when reporting the annual TB notification rate in Korea, the exclusion of "diagnosis changed" cases is desirable.

밤나무 교잡종 과실의 질적 특성

이욱(Uk Lee),김만조(Mahn-Jo Kim),김선창(Sun-Chang Kim),이문호(Moon-Ho Lee),장용석(Yong-Seok Jang) 한국원예학회 2005 원예과학기술지 Vol.23 No.1

본 연구는 밤나무 교잡종 과실의 조합별 및 개체별 질적특성을 조사함으로써 신품종 육성의 기초 자료뿐만 아니라 품종검정 기준설정의 기초자료로 활용하는데 그 목적이 있다. 과실모양은 11 조합의 많은 개체에서 타원형(85.30%)을 나타냈으며 K×R 등 5조합에서 삼각형(3.78%), R×K 등 8조합에서 원형(5.46%), R×O 등 3조합에서 장타원형(5.46%)으로 각각 관찰되었다. 과피색은 모든 조합에서 암갈색과 적갈색이 각각 49.16%와 38.24%로 관찰되었으며 과피털은 K×R과 R×K만이 과피 전체에서 각각 1개체씩 관찰되었다. 과피털의 밀도는 대부분의 조합에서 92.86%가 중 이상이었으며 좌면의 크기는 E×O, E×R, K×O에서만 중 이상인 것으로 조사되었다. 과실의 광택은 K×O조합에서만 약인 개체가 출현하였으며 열과형태는 모든 조합에서 3가지 형태중 2가지 이상의 형태가 각각 혼재되어 있었다. 양적형질이 우수한 8개체 중 RO-22, RO-25 등 2개체만이 과실모양과 과피색이 각각 장타원형과 암갈색을 나타내었으며 OK-2 제외한 나머지 5개체는 각각 타원형과 적갈색으로 관찰되었다. 과피털의 위치는 OK-2 제외한 모든 개체는 과정부였으며 과피털의 밀도는 IO-15 제외한 모든 개체에서 밀하게 분포하였다. 좌면의 크기는 JO-7과 RO-25 개체가 가장 작았으며 광택은 K×O의 1개체를 제외한 모든 개체에서 중 이상으로 우수하였다. 열과형태는 JO-7과 JO-12, IO-15, OK-15 개체에서 각각 과정부 열과와 주두부 열과 등 각각 단일 형태를 나타낸 반면, OK-2 등 4개체는 과정부 열과와 측면부 열과가 혼재하고 있음을 알 수 있었다. 내피박피성을 조사한 결과, OK-2, OK- 4, OK-15 등 3개체는 내피박피율이 20% 내외로 불량한 반면 RO-25, JO-12 등 2개체의 내피박 피율이 각각 78.6%, 72.4%로 매우 우수한 것으로 나타났다. This study was aimed to applicate as the basic data for the presentation of International Union for the Protection of New Varieties of Plants (UPOV) guideline and for breeding new cultivars through qualitative characteristics of nut in chestnut hybrids. In nut shape, oval type, 85.30%, could be observed in all combinations, and triangle type, 3.78%, in K×R, K×O, E×R, I×R, J×O, and oblong type, 5.46%, in R×O, I×O, E×O, I×R, respectively. Both dark and reddish brown, 49.16% and 38.24%, in nut color were observed in all combinations, and nut pericarp hairs in only K×R, R×K could be observed in whole part. The density of its hair showed above middle rank (92.86%) in most of combinations, and the size of hilum area showed above middle rank in only E×O, K×O and E×R. Ten combinations except K×O showed a good condition in nut luster, and two or three types of three split type could be observed in all combinations, simultaneously. Superior individuals, RO-22 and RO-25, showed oblong and dark brown, but others except OK-2 showed oval and reddish brown in nut shape and nut color, respectively. In position of nut pericarp hair, only OK-2 showed stigma part, but all of superior individuals except IO-15 showed thickness in its density. Only JO-7 and RO-25 were smaller than others in size of hilum area, and JO-7, OK-4, OK-15, RO-22 and RO-25 had nuts with excellent luster. Most of individuals had nuts with two or three types in type of nut split, and JO-7, JO-12, IO-15 and OK-15 showed only single type. In peeling rate, OK-2, OK-4 and OK-15 showed around 20% while RO-25 and JO-12 showed 78.6% and 72.4% being considered as superior individuals for roasted chestnuts.

녹황색 채소류 중의 카로티노이드 함량과 Blanching 에 의한 변화

정인창,조정옥 한국조리과학회 2000 한국식품조리과학회지 Vol.16 No.1

시판 녹황색 채소를 대상으로 하여 생것과 3% 끓는 소금물에 데치기한 후의 카로티노이드 색소 함량을 HPLC를 이용하여 분석한 결과는 다음과 같다. 카로티노이드 색소인 α-carotene, β-carotene 그리고 lutein을 각각 분석한 결과 5가지 채소 모두에서 lutein과 β-carotene이 검출되었고 α-carotene은 당근에서만 검출되었다. 또한 lutein은 미나리에서, β-carotene은 부추에서 가장 많은 함량 증가가 있었다. 실험에 사용한 시료 모두에서, 카로티노이드 색소의 구성 성분에는 변화가 없었으나 생것과 비교하였을 때 데친것에서 함량 증가가 나타났다. 이러한 결과로 미루어 보아 채소류는 끓는 3% 소금물에 살짝 데친 후에 섭취하는 것이 카로티노이드 색소의 이용 측면에서 유용하다고 생각된다. Carotenoids in commercial green-yellow vegetables(carrot, mugwort, perilla leaf, leek and water dropwort) were analyzed by HPLC. Carotenoids detected were lutein, α-carotene, and β-carotene. β-Carotene and lutein were detected in every sample analyzed, but α-carotene could only be detected in carrot. Blanching vegetables in 3% saline increased the content of carotenoids, however, the components of carotenoids were not changed. This result suggests that blanching increases the amount of available carotenoids.

니켈기 초내열합금 RENE 80 의 크리프시험중 결정입계 균열생성 및 전파

조창용,김학민,박용조,김승언,이상래 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.11

Two kinds of specimens with different microstructure were prepared by changing casting variables in vacuum investment casting. The effect of microstructural difference on the creep behavior, creep crack initiation and creep crack propagation was studied in Ni base superalloy RENE 80. The specimen having fine grained and uniformly distributed carbide exhibited superior creep properties to the large grained specimen tested at 760℃. However above 870℃, two kinds of specimens showed similar creep behavior. At higher temperature creep, crack initiation was principally caused by the reaction between the grain boundary exposed at the surface and the test atmosphere rather than the internal microstructural changes. The crack initiated at the surface propagated to the internal area and this kind of crack propagation leads to fracture of material.