역내외 현물환, 선물환 및 NDF 거래에 의한 원화 가치 가격발견에 관한 연구

빈기범 ( Ki Beom Binh ),이상민 ( Sang-min Lee ),이원섭 ( Won Seop Lee ) 한국파생상품학회(구 한국선물학회) 2016 선물연구 Vol.24 No.2

본 연구에서는 Hasbrouck(1995, 2002)의 정보공헌도(information share) 기법을 이용하여 역내 외환시장의 원/달러 현물환율과 선도환율, 역외 통화시장의 원/달러 NDF 환율의 장기적 공통추세를 중심으로 한 상호 가격발견의 동학을 분석한다. 분석 결과는 다음과 같다. 첫째 NDF 시장에 비해 역내 외환시장에서의 현물환이나 선물환이 주도적인 가격발견의 기능을 하고 있다. 둘째, 원화 가치는 글로벌 위기시 국내외 정보에 더욱 민감해지는데, 위기의 시기에 있어 NDF의 가격발견 역할이 증대된다. 하지만, 역내 시장의 가격발견상 역할과 비중을 능가하지는 못한다. 결국, NDF 시장이 이른바 왝더독(wag the dog)을 촉발시키는 요인으로 보기 어렵다. 이러한 결과는 NDF 시장에 대한 부정적 인식과 시각을 지닌 시장 참여자나 정책당국자가 참고할 필요가 있다. 나아가, NDF 시장이 원화에 대한 24시간 거래를 가능케 하고, 역내 외환시장의 현물환율이나 선물환율에 대한 가격발견 기능이 있다는 것은 역내 외환 시장에서 주요 환율 지표 결정에 있어 불확실성을 줄이는 역할을 하고 있는 것을 시사한다. Using Hasbrouck`s (1995, 2002) information share method, we examine the mutual price discovery dynamics among Won/Dollar spot, forward, and NDF exchange rates in on- and off-shore FX markets. Our findings include : (i) During the entire period, the mutual price discovery between on-shore FX market and off-shore NDF market are significantly led by on-shore Won-Dollar spot and forward exchange rates. (ii) Within the period around the global crisis, NDF exchange rates have mutual influence on the price discovery, which is expecially greater than the any other period. The results show Won-Dollar spot exchange rate fluctuations during the global crisis are greatly affected by external factors of the international financial markets. Not only that, but off-shore NDF trading promptly reflects the price information of KRW on the factors.

친환경 양계산업으로 가는 길 - 폐사축과 오파란 재활용 방안

이원섭,Lee, Won-Seop 대한양계협회 2016 월간 양계 Vol.48 No.4

사이버 스페이스의 공포

이원섭,Lee, Won-Seop 한국데이터베이스진흥원 2005 디지털콘텐츠 Vol.7 No.-

Comparison of Dental Ages Estimated according to Oral Habit for the Patients with Temporomandibular Disorders

이원섭,김기석,Lee, Won-Seop,Kim, Ki-Suk Korean Academy of Orofacial Pain and Oral Medicine 2007 Journal of Oral Medicine and Pain Vol.32 No.4

This study was performed to investigate the dental ages of the patients with temporomandibular disorders(TMD), using a method of age estimation by dental attrition, and to compare the differences of dental ages between control and experimental groups. In addition, they were compared according to oral habit. Clinical evaluations for the tooth attrition were to examine the study models of 65 TMD patients (mean age of 26.6 years, aged 18 to 40) had visited to the Department of Oral Medicine and Orofacial Pain Clinic, Dental Hospital, Dankook University as a experimental group and 22 volunteers (mean age of 25.4 years, aged 23 to 36) without TMD as a control group. Age differences were calculated subtracting real age from estimated age. Age differences between experimental and control groups were compared statistically between groups classified according to oral habit. As a results, dental age was increased significantly in TMD patients compared with normal subjects. Oral parafunctions which increased dental age were bruxism, clenching and heavy chewing in order. Conclusively, it should be consider that there can be much discrepancy between real age and age estimated by dental attrition in patients with TMD. In addition, it is suggested that dentists should try to protect the tooth from attrition by various parafunction on treating the patients with TMD.

Physical Characterization of GaAs/$\textrm{Al}_{x}\textrm{Ga}_{1-x}\textrm{As}$/GaAs Heterostructures by Deep Level transient Spectroscopy

이원섭,최광수,Lee, Won-Seop,Choe, Gwang-Su Materials Research Society of Korea 1999 한국재료학회지 Vol.9 No.5

The deep level electron traps in AP-MOCVD GaAs/undoped Al\ulcornerGa\ulcornerAs/n-type GaAs heterostructures have been investigated by means of Deep Level Transient Spectroscopy DLTS). In terms of the experimental procedure, GaAs/undoped Al\ulcornerGa\ulcornerAs/n-type GaAs heterostructures were deposited on 2" undoped semi-insulating GaAs wafers by the AP-MOCVD method at $650^{\circ}C$ with TMGa, AsH3, TMAl, and SiH4 gases. The n-type GaAs conduction layers were doped with Si to the target concentration of about 2$\times$10\ulcornercm\ulcorner. The Al content was targeted to x=0.5 and the thicknesses of Al\ulcornerGa\ulcornerAs layers were targeted from 0 to 40 nm. In order to investigate the electrical characteristics, an array of Schottky diodes was built on the heterostructures by the lift-off process and Al thermal evaporation. Among the key results of this experiment, the deep level electron traps at 0.742~0.777 eV and 0.359~0.680 eV were observed in the heterostructures; however, only a 0.787 eV level was detected in n-type GaAs samples without the Al\ulcornerGa\ulcornerAs overlayer. It may be concluded that the 0.787 eV level is an EL2 level and that the 0.742~0.777 eV levels are related to EL2 and residual oxygen impurities which are usually found in MOCVD GaAs and Al\ulcornerGa\ulcornerAs materials grown at $630~660^{\circ}C$. The 0.359~0.680 eV levels may be due to the defects related with the al-O complex and residual Si impurities which are also usually known to exist in the MOCVD materials. Particularly, as the Si doping concentration in the n-type GaAs layer increased, the electron trap concentrations in the heterostructure materials and the magnitude of the C-V hysteresis in the Schottky diodes also increased, indicating that all are intimately related.ated.

애국가 저작권료 논쟁을 바라보며

이원섭,Lee, Won-Seop 한국데이터베이스진흥원 2005 디지털콘텐츠 Vol.3 No.-

히트 파이프용 축열조에서의 축열효율 특성

이원섭(Won-Seop Lee),정태균(Tae-Gyun Jung),최국식(Kook-Sik Choi) 산업기술교육훈련학회 2009 산업기술연구논문지 (JITR) Vol.14 No.3

The horizontal thermal storage tank with heat pipe which is suitable for the sensible heat storage system is able to store a hot water from the heat source such as heating pad efficiently and to supple a hot water to load rapidly. Generally the buoyancy is generated around the heating pad in the horizontal thermal torage tank with heat pipe because of the difference between the lower density of water around the heating pad and the higher density of the storage water. As a result, following conclusion have been obtained through this study. For the case of concentration-type of heating pad, strong intermediate region take place in horizontal thermal storage tank with heat pipe by active heat transfer. So, the more rapid temperature raise difference(about ∆ T=1.6∼3.2℃) is obtainable on the concentration-type than dispersion-type.

증례 : 순환기 ; 근위부와 말단부에 완전골절이 같이 동반된 약물 용출성 스텐트 골절 1예

이원섭 ( Won Seop Lee ),우성일 ( Seong Ill Woo ),김대혁 ( Dae Hyeok Kim ),신성희 ( Sung Hee Shin ),이만종 ( Man Jong Lee ),천웅 ( Woong Cheon ),정주홍 ( Ju Hong Jeong ) 대한내과학회 2011 대한내과학회지 Vol.80 No.2S

가슴 통증으로 내원한 환자가 급성심근경색으로 진단되어 우 관상동맥 근위부와 좌전 하행동맥 중간부위에 혈관성형술을 시행하였다. 우 관상동맥에는 단순 금속 스텐트를 좌전하행 동맥에는 약물 용출성 스텐트를 삽입하였다. 그 후 환자는 외래로 지속적으로 경과관찰 중 6년 후에 간간히 가슴통증 있어 답차운동부하검사(treadmill test) 시행하였고, 양성소견 보여 추적 관상동맥 조영술을 시행하였다. 추적 관상동맥 조영술에서 좌전 하행동맥에 삽입한 약물 용출성 스텐트가 근위부와 말단부에 완전 골절이 같이 동반되어 3조각으로 골절된 1예를 경험하였기에 문헌고찰 stent boost 영상과 함께 보고한다. A patient came to the hospital with chest pain and was diagnosed with acute myocardial infarction. Coronary angioplasty was performed at the right coronary artery (RCA) and left anterior descending artery (LAD). A bare metal stent (BMS) was inserted in the RCA and a drug eluting stent (DES) was inserted in mid-LAD. The patient was discharged and was followed up as an outpatient without any symptoms. After 6 years, the patient complained of intermittent chest pain. A treadmill test was performed, and the results were positive. Follow-up coronary angiography was performed, and it showed that the DES inserted in mid-LAD had a complete stent fracture at the distal and proximal sites of the stent. Thus, we report a case of complete stent fracture at the proximal and distal sites in one drug eluting stent. (Korean J Med 2011;80:S146-S151)

Occlusal Analysis of the Patients with Temporomandibular Disorders Using T-Scan II System

양동효,이원섭,김미은,Yang, Dong-Hyo,Lee, Won-Seop,Kim, Mee-Eun Korean Academy of Orofacial Pain and Oral Medicine 2007 Journal of Oral Medicine and Pain Vol.32 No.1

Correlation between occlusal contact pattern and TMD have been hypothesized and partially investigated but results are controversial and not conclusive. The purposes of this study were to compare right-to-left difference of occlusal contact pattern, through contact points, contact force and occlusal balance, in the patients with unilateral TMD and also to evaluate its change related with TMD treatment. 36 patients with unilateral TMD from Department of Oral Medicine in Dankook University Dental Hospital were selected in this study (M:F=7:29, mean age of $29.2{\pm}14.8$ years). A computerized T-Scan II system (Tekscan, INC., USA) was employed for occlusal analysis and the simultaneity and occlusal balance through the number of tooth contact and magnitude of contact force were determined before and after TMD treatment. The number of contact points and contact force was more on the unaffected side than the affected side before treatment (p=0.056 and p=0.060, respectively) while significant difference between both sides was not found after treatment. The number of contact points and contact force on the affected sides significantly increased after treatment (p=0.038 and p=0.052), but the unaffected sides exhibited no significant difference between before and after treatment. In addition, sides difference in relative contact force decreased from about 27% to about 12% after TMD treatment (p=0.001). According to the results of this study, it is likely that unilateral TMD impairs right-to-left occlusal balance and that conservative TMD treatment alleviates the imbalance, subsequently leading to more symmetrical occlusal condition with increased contact points and force.

포항시 교통안전 의식 제고를 위한 데이터 분석 및 시각화 연구 : 교통안전 취약계층을 중심으로

김성섭(Seong Seop Kim),김유빈(Yu Been Kim),김예람(Yearam Kim),노대영(Dae Young Roh),이원섭(Won Seop Lee),최혜봉(Hye Bong Choi) 한국HCI학회 2021 한국HCI학회 학술대회 Vol.2021 No.1

The number of elderly populations in South Korea has increased by nearly 3 million in the last 10 years in 2020. This increasing trend is expected to continue. The increase in elderly population leads to an increase in the number of elderly drivers which also increases the risk of traffic accidents every year. Traffic accidents involving elderly pedestrians are increasing as well. However, Korean society has yet to recognize the seriousness of elderly-related traffic accidents. Recently, municipal governments have implemented various policies, such as voluntary return of licenses, for elderly drivers, but they have not been able to take proper measures. Pohang City is also conducting voluntary return of driver’s licenses to senior citizens aged 65 or older, but their effectiveness is low. Gyeongsangbuk-do Province, where Pohang belongs, is already super-aged with an aging rate of more than 20 percent. Therefore, it is essential to manage elderly people who are vulnerable to traffic accidents.