유치악자와 총의치 장착자의 저작운동시 교근과 측두근의 근할성도에 관한 비교연구

최승현,최부병,최대균,Choi, Seung-Hyun,Choi, Boo-Byung,Choi, Dae-Gyun 대한치과보철학회 1991 대한치과보철학회지 Vol.29 No.1

This study was performed to investigate the muscular activity of the complete denture wearers compare with subjects with natural teeth. For the study, 10 subjects with natural dentition and 18 upper and lower complete denture wearers selected and the Bio-electric Processor EM2(Myo-tronics Reaserch, Inc., U.S.A.) with the surface electrodes was used to record electromyographic activity from the right and left middle of masseter and anterior temporal muscles of each subject during mandibular postural rest position, tapping of teeth from postural rest position, maximal clench, and right and left gum and raw carrow chewing. This results of this study were as follows : 1. In mandibular postural rest position, the denture wearers produces high muscular activity in contrast to natural objects(P<0.05) but, there was no difference between the state of denture removal and insertion, and the muscle activity of the anterior temporal muscle was high than the middle of masseter muscle in natural objects and denture wearers. 2. In tapping of teeth, there was no difference in muscle activity between natural objects and the state of denture removal of denture wearers. 3. In maximal clench, there was markedly lower denture wearers than natural objects in muscle activity, and the ratio of mean voltages was about 36 percentages. 4. In gum and raw carrow chewing, the activity was lower than natural object, the ratio was about 59 percentages. 5. In chewing, the mean voltages of the middle of masster muscle on the chewing side was highest, followed by the anterior temporal on the chewing side, the anterior temporal and masster muscles on the non-chewing side.

고로미분탄 취입랜스의 연소효율 향상을 위한 노즐 제어의 최적화

최승현,곽남수,김재열,Choi, Seung-Hyun,Kwak, Na-Soo,Kim, Jae-Yeol 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.2

This paper introduces the automatic fine Bituminous Coal injection lance position control method using flame image process. The fine Coal injection lance is used to supply additional heat into the furnace in Mill plant. It injects fine coal into high pressured air flow and produces very heated and high pressured flame. For the such high temperature and pressure, the fine coal injection lance effects not only efficiency of burner but also furnace abrasion. To keep efficient combustion status and to avoid the abrasion, in this paper, the flame is monitored by computer image process. This paper proposes the flame image process method and lance position control according to calculated result for flame image process.

A Design of Software Receiver for GNSS Signal Processing

최승현,김재현,신천식,이상욱,김재훈,Choi, Seung-Hyun,Kim, Jae-Hyun,Shin, Cheon-Sig,Lee, Sang-Uk,Kim, Jae-Hoon Korea Society of Satellite Technology 2007 한국위성정보통신학회논문지 Vol.2 No.2

Recently, the research of GPS receiver which uses the Software-Defined Radio(SDR) technique is being actively proceeded instead of traditional hardware-based receiver. The software-based GPS receiver indicates that the signal acquisition and tracking treated by the hardware-based platform are processed as the software technique through a microprocessor. In this paper, GPS software receiver is designed by using SDR technique and then the signal acquisition, tracking, and the navigation message decoding parts are verified through the PC-based simulation. Moreover, the efficient algorithms are developed about the signal acquisition and tracking parts in order to obtain the accurate pseudorange. Finally, the pseudorange is calculated through the relative channel delay received through the different satellite of L1 frequency band. GPS software receiver proposed in this paper will be included in the element of GPS/Galileo complex system of development target and will provide not only the method that verifies the performance for Galileo Sensor Station standard but also usability by providing various debugging environments.

무와 비교한 콜라비의 성분분석

최승현,류동걸,박수형,안경구,임용표,안길환,Choi, Seung-Hyun,Ryu, Dong-Kul,Park, Su-Hyoung,Ahn, Kyoung-Gu,Lim, Yong-Pyo,An, Gil-Hwan Korean Society of Horticultural Science 2010 원예과학기술지 Vol.28 No.3

무의 소비에 있어서 주된 문제점은 glucosinolate에 의한 쓴맛과 매운맛이다. 최근에 무의 문제점을 보완할 수있는 콜라비가 한국에 도입되어 제주도에서 월동재배가 이루어지고 있다. 두 작물의 식감과 맛이 비슷하여 품질을 비교 분석하였다. 콜라비의 환원당, cellulose, pectin의 함량은 무보다 낮았다. 식감은 콜라비가 무보다 더 단단한 것으로 나타났으며, 아미노산의 함량은 콜라비가 무보다 약 2.7배 정도 높았다. 특히 aspartate, glutamate, arginine과 같은 수용성 유리 아미노산의 함량이 무보다 콜라비에서 3배 정도 높게 나타났다. 총 glucosinolate 함량은 콜라비가 무의 내부 보다 12.4배, 외부 보다 28.5배로 각각 낮았다. 관능평가에서 콜라비의 쓴맛과 매운맛이 무보다 적게 나타났다. 항암성분으로 알려진 glucoraphanin은 무 보다 콜라비에 더 많이 함유되어 있는 것으로 나타났다. 콜라비의 환원당 함량이 무에 비해 적음에도 불구하고 관능평가에서 무보다 콜라비가 더 달다는 결과가 나왔다. 이는 무보다 콜라비가 더 많은 수용성 유리 아미노산을 함유하기 때문일 것이라 생각된다. 결과적으로 콜라비는 맛과 기능적인 면에서 무보다 높게 나타나 소비가 증가될 것으로 예상된다. The major deterring factor of radish consumption is bitter and pungent tastes caused by glucosinolates. Recently kohlrabi was introduced in Korea and mainly cultivated in Jeju Island during winter. Since the texture and taste of kohlrabi are similar to radish, the kohlrabi is expected to substitute radish. This study was done to compare compositional quality between kohlrabi and radish. The kohlrabi contained less reducing sugars, cellulose and pectin than the radish. The kohlrabi had harder texture than the radish. The total amino acid content in the kohlrabi was 2.7-fold higher than that in the radish. Especially hydrophilic amino acids including aspartate, glutamate and arginine, were about 3-fold higher in the kohlrabi, suggesting that the kohlrabi was more palatable than the radish. The total contents of glucosinolates in the radish in inner and outer section were higher than those in the kohlrabi by 12.4- and 28.5-fold, respectively. In a sensory test, the kohlrabi was evaluated less bitter and pungent than the radish. The kohlrabi contained more glucoraphanin, an anticancer compound, than the radish. Furthermore, the sweetness of the kohlrabi was evaluated higher than that of the radish, though kohlrabi contained less reducing sugars, probably due to high contents of hydrophilic amino acids. In conclusion, the kohlrabi was evaluated as more favorable in taste and contained more functional compounds than the radish, and thus it can be a good replacement vegetable for radish.

FI-HG-AAS를 이용한 전처리 과정에서 사용되는 예비환원제의 종류에 따른 요중 비소 분석결과 비교

최승현,최재욱,조용민,배문주,Choi, Seung-Hyun,Choi, Jae Wook,Cho, YongMin,Bae, Munjoo 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.5

Objectives: The method of analyzing urinary arsenic by flow injection hydride generation atomic absorption spectrometry (FI-HG-AAS) is generally used because it shows relatively greater sensitivity, low detection limits, low blocking action, and is simple to operate. In this study, the results of analysis according to three pre-reductants commonly used in the FI-HG-AAS method were compared with each other. Methods: To analyze urinary arsenic, nineteen urine samples were collected from adults aged 43-79 years old without occupational arsenic exposure. Analysis equipment was FI-HG-AAS (AAnalyst 800/FIAS 400, Perkin- Elmer Inc., USA). The three pre-reductants were potassium iodide (KI/AA), C3H7NO2S (L-cysteine), and a mixture of KI/AA and L-cysteine (KI/AA&L-cysteine). Results: In the results of the analysis, the recovery rate of the method using KI/AA was 82.3%, 95.7% for Lcysteine, and 123.5% for KI/AA and L-cysteine combined. When compared with the results by use of high performance liquid chromatography inductively-coupled plasma mass spectrometry (HPLC-ICP-MS), the method using L-cysteine was the closest to those using HPLC-ICP-MS ($98.57{\mu}g/L$ for HPLC-ICP-MS; $74.96{\mu}g/L$ for L-cysteine; $69.23{\mu}g/L$ for KI/AA and L-cysteine; $13.06{\mu}g/L$ for KI/AA) and were significantly correlated (R2=0.882). In addition, they showed the lowest coefficient of variation in the results between two laboratories that applied the same method. Conclusion: The efficiency of hydride generation is considered highly important to the analysis of urinary arsenic via FI-HG-AAS. This study suggests that using L-cysteine as a pre-reductant may be suitable and the most rational among the FI-Hg-AAS methods using pre-reductants.

LID기법을 이용한 전주 덕진공원의 수생태 복원 가능성 평가

최승현,김석휘,김강주,Choi, Seung-Hyun,Kim, Seok-Hwi,Kim, Kangjoo 대한자원환경지질학회 2015 자원환경지질 Vol.48 No.6

본 연구에서는 빗물 함양사업을 통하여 전주시 덕진공원 유역 내 옛 하천들의 복원가능성을 검토하였다. 본 연구는 다양한 상황에서의 지하수유출량을 모사하는 방법으로 수행되었다. 덕진연못의 상류유역을 흐르던 하천을 복원한다고 했을 때, 이들이 비강우기에도 유량을 유지하기 위해서는 어디에 얼마만큼의 지하수 함양을 추가로 시켜야 하는 지, 그리고 하천들의 기저유출유량은 덕진연못의 수생태유지에 충분한 지를 지하수모델을 이용하여 평가하였다. 본 연구결과, 덕진연못의 빗물 배수를 저영향개발(low impact development; LID) 사업을 통하여 개발이전과 유사한 빗물배수체계를 만들어 준다면 복원되는 하천들은 갈수기에도 상당기간 기저유출로 유량이 유지될 수 있음을 알 수 있었다. 덕진연못 집수구역의 최상류구역인 동물원과 주변지역에서 지하수 함양을 증가시키는 것이, 하류 대지천의 기저유출 유량을 증가시키는 것에 유리함을 지시한다. 아울러, 몇몇 지점에서의 집중적인 지하수함양보다는 넓은 지역에서 고르게 일어나는 지하수함양이 하천의 건천화 방지에 더 유리한 것으로 나타났다.

도로 자산관리를 위한 상태 모니터링 및 경제성 분석 : 세종시를 중심으로

최승현,박정권,도명식,Choi, Seung-Hyun,Park, Jeong-Gwon,Do, Myung-Sik 한국ITS학회 2021 한국ITS학회논문지 Vol.20 No.4

In this study, a novel method for monitoring road pavements using the Mobile Mapping System (MMS) and a deep learning crack detection system was presented. Furthermore, an optimal maintenance method through economic analysis was presented targeting the pavement section of Sejong City. As a result of monitoring the pavement conditions, it was confirmed that the pavement ratings were good in the order of national highways, municipal roads, and roads of provinces. In addition, economic analysis using the pavement deterioration model showed that micro-surfacing, one of the preventive maintenance methods, is the most economical in terms of maintenance costs and user benefits. The results of this study are expected to be used as fundamental reference for local governments' infrastructure management plans.

동위원소를 이용한 하수 내 지하수 및 우수 함량 산출: 전주 덕진공원 유역 사례

최승현,김강주,문상호,Choi, Seung-Hyun,Kim, Kangjoo,Moon, Sang-Ho 대한자원환경지질학회 2016 자원환경지질 Vol.49 No.5

It is well known that the inflow of rainwater and the infiltration of groundwater to sewerage (I/I) increase the sewage and burden sewage treatment plants and lower their treatment efficiency. Therefore, it is important to estimate the amount of I/I. In this study, well groundwaters, public water supplies (PWSs), and sewage and rainwater channels were investigated to check whether oxygen and deuterium isotopes could be used as a tool for I/I estimation. This study shows that the isotopic composition of PWS in Jeonju area is very consistent over time and distinctly lighter than the circulating local rainwater (CLR) because it is supplied from Yongdam Dam, which is located about 40 km inland to the east in the mountainous area. Considering the fact that sewage mostly originates from the PWS, we could calculate the amounts of CLR in the sewerage from a monitoring station using unaffected rainwater and tap water as mixing end members. The calculation revealed that the CLR fraction ranged from 50% to 90% depending on observation time. This is well supported by the dilute natures of the sewages at the station. The fraction of PWS in investigated well waters were about 46%, indicating that leaking of PWS is very serious and is an important groundwater source in the study area. Since the infiltration of such groundwater may not alter the isotopic composition of sewage significantly, the actual I/I would be much greater than the calculated ones.

전주시 덕진연못의 수생태 복원을 위한 용수확보방안 연구: 도시 저수지 복원의 새로운 패러다임

최승현,김석휘,이진원,김강주,오창환,Choi, Seung-Hyun,Kim, Seok-Hwi,Lee, Jin Won,Kim, Kangjoo,Oh, Chang Whan 대한자원환경지질학회 2015 자원환경지질 Vol.48 No.6

The Deokjin Pond is one of the places representing Jeonju City's history but has the poor water quality. The pond has a storage of $88,741m^3$ and a drainage area of $3.77km^2$. It has been maintained only by the groundwater pumped from the upstream wells and the direct rainfalls on the water surface since the old streams replenishing the pond were turned into a part of the sewer system due to indiscreet urbanization. The lack of replenishing water as well as the organic-rich bottom sediment were suggested as two main causes deteriorating the water-ecosystem. In this study, possible measures obtaining waters for restoration of Deokjin Pond ecosystem are discussed. It is estimated that the present pond can be replenished about 32 times a year by the runoff when the drainage system in the watershed is recovered to a state before urbanization. To support this, the drainage system is compared with that of nearby Osong Pond, which shows relatively better water-ecosystem. Even though Osong Pond has a drainage area one-seventh of that of Deokjin Pond, its storage is more than the half of it. It is because its watershed has a near natural drainage system where the rain mostly infiltrates into soil and slowly discharges into the pond. Therefore, it is believed that the low impact development (LID), which is known as a technique restoring the water circulating system to a condition before development, would be helpful in obtaining waters required for Deokjin Pond ecosystem management.

매실박, 당근박, 감귤박 급여가 산란계 난황의 Vitamin E, K 함량에 미치는 영향

최승현,나재천,권오상,박상미,이봉덕,안길환,Choi, Seung-Hyun,Na, Jae-Cheon,Kwon, O-Sang,Park, Sang-Mee,Lee, Bong-Duk,Ahn, Gil-Hwan 충남대학교 농업과학연구소 2008 Korean Journal of Agricultural Science Vol.35 No.2

This experiment is a quantitative experiment where insoluble Vitamins E and K are extracted from the yolk of the spawning which was fed by by-products of tangerine, carrot, or Japanese apricot. Finally the purpose is to raise contents of the insoluble Vitamins E and K inside the yolk of the spawning. The saponification method through ${\alpha}$, ${\alpha}$ - dipyridyl was used to determine the content of Vitamin E. Diethyl dithiocarbamate assay was used to examine the content of Vitamin K. The contents of Vitamin E in egg yolks of chicken fed by by-products of tangerine, carrot, or Japanese apricot increased 2 - 3 times compared to control egg, while the contents of Vitamin K almost no changed.