비름(Amaranth)과 명아주(Quinoa) 재배종의 기능성 물질과 변이

이재학,김기준,이정일,이승택,류수노,Lee, Jae-Hak,Kim, Ki-Jun,Lee, Jung-Il,Lee, Seung-Tack,Ryu, Su-Noh 한국작물학회 1996 Korean journal of crop science Vol.41 No.S

Amaranth(Amaranthus spp. L.) and quinoa (Chenpodium quinoa Willd.) are old crops from South, Central America and Central Asia and their grains have been identified as very promising food crops because of their exceptional nutritive value. Squalene is an important ingredient in skin cosmetics and computer disc lubricants as well as bioactive materials such as inhibition of fungal and mammalian sterol biosynthesis, antitumor, anticancer, and immunomodulation. Amaranth has a component called squalene (2,6,10,15,19,23-hexamethyl-2,6,10,14,22-tetraco-sahexaene) about 1/300 of the seed and $5\~8\%$ of its seed oil. Oil and squalene content in amaranth seed were different for the species investigated. Squalene content in seed oil also increased by $15.5\%$ due to puffing and from 6.96 to $8.01\%$ by refining and bleaching. Saponin concentrations in quinoa seed ranged 0.01 to $5.6\%$. Saponins are located in the outer layers of quinoa grain. These layers include the perianth, pericarp, a seed coat layer, and a cuticle like structure. Oleanane-type triterpenes saponins are of great interest because of their diverse pharmacological properties, for instance, anti-inflammatory, antibiotic, contraceptive, and cholesterol-lowering effects. It is known that quinoa contains a number of structurally diverse saponins including the aglycones, oleanolic acid, hederagenin, and phytolaccagenic acid, which are new potential in gredient for pharmacological properties. It is likely that these saponin levels will be considerably affected by genetic, agronomic and environmental factors as well as by processing. With the current enhanced public interest in health and nutrition amaranth and quinoa will most likely remain in the immediate future within the realm of exotic health foods until such time as agricultural production meets the quantities and qualify required by industrial food manufacturers.

요통환자의 물리치료에 관한 임상적 연구

이재학,장수경,한동직,Lee, Jae-Hak,Jang, Su-Gyeong,Han, Dong-Jik 대한물리치료사협회 1981 대한물리치료사협회지 Vol.3 No.-

A Clinical Study of physical Therapy on the Low Back Conditions J. B. Rhee, S. K. fang, D. J, Han Low back pain usually is due primarily to a faulty mechanics, ,dis'c disease and other contributing factors .Conservative treatment of low back pain is considered to be useful with applicationes physical therapeutic measures including elimination of gravity, but surgical treatment is alternative to conservative .This study 1s conducted to analyse and evaluate efficiency of physical therapy on the low back pain on 452 cases who were treated at the Korea University Hospital, from January 1, 1978 to December 31. 1978.The results obtained in this study are summarized as follows :1. Sex distribution of total rationㄷs surveyed showed that 5l.3% in male and 487% in female.2 . In the age distrbution. the mest Liedominant age group was 25-54 years with7O.8 % .3 . The most proportion of the cases by occupation was housewife 27.7%, clerical and office workers 2l.7% , students 12.8% and labours 12.2 % respectively .4 . The most common causes of low back conditions classified, the Strain or Trau-rla revealed the highest frequency with 58.4% and thc Herniated Nucleus Pulpe-sus with 29.2 % of the total.5 . The modalities of physical therapy suitable to each cases were applied : 94.0%of all cases were treated with deep thermotherapy, 91.4 % hydrocollator steampack, 86.7% strengthening exercise of the weak muscles, pelvic traction 34.1%.6 . In regard to the duration required for the physical therapy. Herniated Nucleus Pulposus were approximately 4 weeks and strain or trauma were 2 weeks.7 . The improvement by physical therapy on lcw back conditions was classified in-to 41grades and showed following reaulits , excellent 42.5%, good 37.8%, fair 13.7% and poor 6.0% respectively.

조석 모델링에서 adjoint 방법 적용시 적정 가중치 산정

이재학,박경,송용식,Lee, Jae-Hak,Park, Kyeong,Song, Yong-Sik 한국해양학회 2000 바다 Vol.5 No.3

자료동화기법의 하나인 adjoint 방법은 제약조건으로서 모델의 기본방정식을 만족시키는 동시에 모델 결과와 관측자료 차이의 함수인 비용함수의 크기를 최소화시키는 모델변수를 찾아냄으로서 모델 결과를 향상시키는 기법이다. 본 연구에서는 수평방향 2차원 선형 조석모델과 adjoint 모델로 구성된 adjoint 꾸러미를 수립하고, 이를 임의로 설정한 직사각형 모델영역에 적용하였다. 조석모델로부터의 조위 모델 결과를 관측자료로 삼아 개방경계조건인 조위의 진폭을 역 추정하는 수치실험을 실시하여 자료 가중치에 대한 반응, 모델변수 초기 추정치의 중요성 및 지형 변화에 대한 반응 등을 살펴보았다 특히, adjoint꾸러미 적용시 대부분 경험적으로 설정되어왔던 가중치의 선정방법을 제시하였다. The adjoint method is a method of data assimilation to improve the model results by seeking for model parameters that minimize the cost function and satisfy the governing equations of a model simultaneously. An adjoint package was set up for the two-dimensional linear tidal model and was applied to an idealized domain for an optimal estimation of the open boundary conditions. The assimilating data were selected from the results of forward modeling. Attention is paid on the response of the adjoint package to weighting parameters, the importance of initial estimates of model parameters and the applicability of the adjoint package to the case with varying depth. A procedure to determine optimal weight is presented based on the relationships between weights and other factors.

절단환자의 물리치료에 관한 임상적 연구

이재학,Lee, Jae-Hak 대한물리치료사협회 1983 대한물리치료사협회지 Vol.5 No.1

가로림만 저서동물군집에 관한 연구

이재학,홍재상,이순길,Lee, Jae Hac,Hong, Jae-Sang,Yi, Soon Kil 한국해양학회 1983 韓國海洋學會誌 Vol.18 No.2

A semi-quantitative investigation on the subtidal macrobenthic community was carried out using dredge in Garolim Bay from February 1980 to June 1981.Of the 340 species of benthic fauna collected,the most dominant species with the numerical abundance of 12.3% was an ophiruroid,Ophiactis modesta which had a strong colony nature.Garolim Bay was also dominated by many suspension-feeders like Ophiactics modesta and Musculista senhousia. Due to hetergenorous sediments,Garolim Bay appeared to be rich and diverse in the faunal composition.Based on th topography of the bay and sediment types,the study area is easily divied into two zones;inner bay and outward bay area.

Spin-on Glass를 이용한 실리콘과 유리의 저온 접합 공정

이재학,유중돈,Lee Jae-Hak,Yoo Choong-Don 대한용접접합학회 2005 대한용접·접합학회지 Vol.23 No.6

Low temperature bonding of the silicon and glass using the Spin-on Glass (SOG) has been conducted experimentally to figure out the effects of the SOG solution composition and process variables on bond strength using the Design of Experiment method. In order to achieve the high quality bond interface without rack, sufficient reaction time of the optimal SOG solution composition is needed along with proper pressure and annealing temperature. The shear strength under the optimal SOG solution composition and process condition was higher than that of conventional anodic bonding and similar to that of wafer direct bonding.

디지털제어방식을 이용한 자동차용 고압방전등 안정기의 조광제어

이재학,김윤호,Lee, Jae-Hak,Kim, Yoon-Ho 한국조명전기설비학회 2005 조명·전기설비학회논문지 Vol.19 No.1

본 논문은 디지털제어방식을 이용한 자동차용 35[W]급 메탈핼라이드 램프용 전자식 안정기의 고효율 조광제어 시스템을 구현하였다. 본 논문에서는 밝기, 연색성, 광효율, 수명 등에서 기존의 할로겐 램프에 비해 우수한 특성을 가지고 있지만 복잡한 과도특성을 가지고 있는 메탈핼라이드 램프를 자동차에 적용하기 위해 디지털 제어방식을 전자식 안정기에 적용하여 램프 요구조건 및 주변 환경에 최적으로 적용할 수 있도록 전자식 안정기를 설계하였다. 또한, 주변의 빛의 세기에 따라 램프의 양단전압을 단계별로 가변 제어하는 조광시스템을 구현하여, 운전자에게는 보다 효율적인 운전여건을 만듬과 동시에 한정된 에너지를 가진 밧데리로 운전하는 자동차에서 효율적인 전력제어를 실현하였다. 개발된 안정기에 대한 동작특성을 시뮬레이션과 실험을 통해 확인하였다. This paper presents dimming control system for automotive 35[W] metal halide discharge(MHD) lamp electronic ballast using digital control method. HID system has been becoming increasingly popular due to its superior performance(high luminous efficacy, good color rendering and long life etc.)over the conventional halogen system. However, this lamp demands a highly efficient ballast and very complex control circuitry that can control complex transient state in applying to automotive. Therefore, in this paper, digital control method for the HID lamp ballast is presented for optimal control that can adapt complex transient state, steady state and various environments. In developed dimming system, the system is designed to control the lamp output voltage step by step using microcontroller according to cds sensor. Therefore the designed dimming control system give good driving condition to diver and realize the power control effectively. The results of the proposed system is verified through various simulation results and the experiment results.

목포 주변 해역 조하대 저서동물 군집의 시 ${\cdot}$ 공간적 분포

이재학,최진우,박흥식,Lee, Jae-Hac,Choi, Jin-Woo,Park, Heung-Sik 한국해양학회 2000 바다 Vol.5 No.2

본 조사는 목포 인근 연안 저서동물의 종 조성과 군집의 시 ${\cdot}$ 공간적 분포를 알아보기 위해 실시하였다. 조사기간 중 총 238종, 663 ind./$m^{2}$의 생물이 채집되었으며 , 다모류가 88종, 389 ind./$m^{2}$로 가장 우점하는 동물군으로 나타났다. 영산강 하구역과 목포항 부근에서는 니질퇴적상과 높은 유기물함량을 나타냈으며, 표층 염분도와 저층 용존산소 등은 계절에 따라 큰 차이를 보였다. 그러나, 외해역의 경우에는 환경변화가 거의 나타나지 않았다. 집괴분석에 의한 군집구조는 4개 지역으로 나누어 졌다. 정점 1과 9로 구성된 2개 그룹은 계절적인 종조성의 차이에 의해, 다른 두 개 그룹은 지역적인 차이에 의해 내만역 (영산강 하구역과 금호방조제 부근)과 연안해역으로 나누어졌다. 이들 지역은 종 수와 생물 다양도에서는 유사하였으나 종조성에서는 큰 차이를 나타냈다. 우점종의 경우 내만역은 Tharyx sp. Poecilochaertus johnsoni, Heteromastus filiformis 등 기회종이 다수 포함된 반면, 연안해역은 Ruditapes philippinarum, Corophium sinense 등으로 구성되었다. 환경변화와 종 조성에 따른 연구 결과, 내만역은 외해역에 비해 담수방류, 유기물 증가 등 저층에 환경교란이 일어나 계절적으로 불안정한 생태계를 나타냈다. 따라서 연안개발 등이 시 ${\cdot}$ 공간적으로 목포 주변 해역 저서동물군집에 영향을 미치는 것으로 볼 수 있다. This study was carried out to clarify the spatial and temporal patterns of macrobenthic assemblages on the subtidal area around Mokpo, southwest of Korea. A total of 238 species and 663 ind./$m^{2}$ were collected. Polychaetes were the most abundant faunal group that comprised 88 species and had a mean density of 389 ind./$m^{2}$. In the semi-enclosed Youngsan River estuarine bay and neighbouring Mokpo Port area were composed of fine sediments with high organic content, and revealed large seasonal variations in the salinity of surface water and bottom dissolved oxygen in contrast to little seasonal changes in those parameters in the outer area. The study area was classified into four station groups by the cluster analysis; the harbor area, the offshore area, and the inner and outer estuarine bay. Two estuarine bay areas showed different species composition; the dominant species of inner bay were Tharyx sp., Poecilochaetus johnsoni, Heteromastus filiformis and other opportunistic species whereas those in the outer bay were Ruditapes philippinarum, Corophium sinense. From the environmental data and species composition of benthic community, the inner bay was characterized to have unstable benthic faunal assemblages, especially under the seasonal disturbance and receiving large amount of organic matter input and intermittant discharge of fresh water. The coastal developments around Mokpo city also seem to have stressed the subtidal communities spatio-temporally.

산부식과 CO₂ 및 Nd:YAG 레이저 조사에 따른 상아질 표면의 변화

이재학,박준상,고명연,Lee, Jae-Hak,Park, June-Sang,Ko, Myung-Yun 대한안면통증구강내과학회 2000 Journal of Oral Medicine and Pain Vol.25 No.1

The purpose of this study was to examine dentin surface changes of extracted sound third molar specimens which were etched with 10% maleic acid and irradiated at $7-140J/cm^2$ with $CO_2$ and at $156-280J/cm^2$ with Nd:YAG laser. The results were as follows. 1. Dentin surfaces etched with 10% maleic acid and then irradiated at below of $42J/cm^2$ with $CO_2$ laser showed the retentive morphology for resin restoration. 2. Dentin surfaces irradiated at below of $42J/cm^2$ with $CO_2$ laser showed the increased acid-resistance. 3. Dentin surfaces irradiated at $218-280J/cm^2$ with Nd:YAG laser showed the retentive morphology. 4. Dentin surfaces irradiated at $218-280J/cm^2$ with Nd:YAG laser and etched 10% maleic acid and then $218-280J/cm^2$ with Nd:YAG laser showed the increased acid-resistance.

힘-변위 모델을 이용한 펄스 GMAW의 해석

이재학,유중돈,Lee, Jae-Hak,Yoo, Choong-Don 대한용접접합학회 2009 대한용접·접합학회지 Vol.27 No.1

In order to determine the One-Drop One-Pulse(ODOP) condition of the pulsed gas metal arc(GMA) welding, the drop detaching phenomenon during the peak time is investigated using the force-displacement model. The drop detaching criterion is established based on the displacement of the pendant drop, and the forces exerted on the drop are calculated using the Modified Force Balance Model(MFBM). The effects of wire melting on the drop size and force are included in the force-displacement model. While the peak current has most significant effects on the drop detaching time, the initial drop mass prior to the peak time also influences drop transfer. The calculated results show good agreements with the experimental data, which implies that the ODOP condition can be predicted using the force-displacement method.