eLoran 항법성능 평가 플랫폼 설계

황상욱,신미영,유동희,박찬식,이창복,이상정 제어로봇시스템학회 2010 제어로봇시스템학회 국내학술대회 논문집 Vol.2010 No.5

In this paper, the evaluation platform for eLoran navigation performance is designed ta research about suitability of eLoran in Korea. For doing this, the evaluation platform uses a performance index that are DOP, NSP with the signal attenuation and the predicted ASF using Monteath model. Simulations present the optimization placement of transmitters with expected navigation performance and the comparison results between the predicted ASF and the measured ASF. The measured ASF is measured from the legacy Loran-C signal transmitted Pohang station in the GRI-9930 chain.

CNC 가공기계의 절삭유 공급 불량 감지 시스템 개발

황상욱,김종엽,홍대선 제어로봇시스템학회 2013 제어로봇시스템학회 국내학술대회 논문집 Vol.2013 No.5

International Time Comparison by TWSTFT and GPS at KRISS

황상욱,이창복,이종구,이용규,이상정,양성훈 사단법인 항법시스템학회 2016 Journal of Positioning, Navigation, and Timing Vol.5 No.2

In this paper, time comparison is performed with standardization institution in Japan using a Two-Way Satellite Time and Frequency Transfer (TWSTFT) technique as one of the methods for high precision time comparison. To analyze the performance of time comparison in the TWSTFT method, time comparison results via the Global Positioning System (GPS) code and carrier wave are analyzed. Through the time comparison performance, frequency stability is analyzed using modified Allan deviation and by this result, characteristics of time comparison of the TWSTFT that is utilized in international time comparison are presented.

韓國産 天南星科 植物에 關한 本草學的 硏究

황상욱,김태현,宋昊埈,辛民敎 한국전통의학연구소 1999 한국전통의학지 Vol.9 No.1

For the purpose of developing Korean Herbalogy with the plants of Araceae which grow wild and is planted in Korea, the these and writings on herbalogy, from literature of successive generations, have been thoroughly investigated and the results obtained were as follows: 1. There were totaled to 14 genera and 42 species in Korea and among them medicinal plants are 7 genera, 23 species, some 55% in total but, the number of species may be added because of the similiar plants. 2. According to the oriental names which can be used for medical purpose, the medicinal plants belonging to the Araceae family were classified as Rhizoma 20, Radix 10, Folium 4, Flos 3, Herba 1. Thus it was noticed that Rhizoma and Radix was the main kind. 3. According to sum of 42 species in Araceae family, they were classified into Arisaema genera 17, Acorus and Zantedeschia genera 4 each, Philodendron and Symplocarpus genera 3 each, Anthurium and Colocasia genera 2 each. Thus it was noticed that Arisaema genera was the main kind, some 40.5% in total. 4. According to nature and flavour of medicinal plants, they were classified into warmth and heat ; 25, cold and cool ; 3, balance 2 and unidentified 6. Thus it was noticed that warmth and heat is the main in nature and flavour of medicinal plants. 5. Comparing to whole medicinal plants 23 kinds, toxic drugs include minor toxin were 18 kinds, 78.3% of the whole. From this result, It was revealed that the plants for medical purpose in Araceae was 55% of the whole, in which RHIZOMA and RADIX was mostly abundunt. It is considered that many experiements and clinical approaches must be continued to use Araceae plants widely.

A Design of LORAN Disciplined Oscillator

황상욱,최윤섭,여상래,박찬식,양성훈,이상정 사단법인 항법시스템학회 2013 Journal of Positioning, Navigation, and Timing Vol.2 No.1

This article presents the design of long range navigation (LORAN)-disciplined oscillator (LDO), employing the timing information of the LORAN system, which was developed as a backup system that corrects the vulnerability of the global positioning system (GPS)-based timing information utilization. The LDO designed on the basis of hardware generates a timing source synchronized with reference to the timing information of the LORAN-C receiver. As for the LDO-based timing information measurement, the Kalman filter was applied to estimate the measurement of which variance was minimized so that the stability performance could be improved. The oven-controlled crystal oscillator (OCXO) was employed as the local oscillator of the LDO. The controller was operated by digital proportional-integral-derivative (PID) controlling method. The LDO performance evaluation environment that takes into account the additional secondary factor (ASF) of the LORAN signals allows for the relative ASF observation and data collection using the coordinated universal time (UTC). The collected observation data are used to analyze the effect of ASF on propagation delay. The LDO stability performance was presented by the results of the LDO frequency measurements from which the ASF was excluded.

자산가격변화와 비정보기반투자자의 심리에 대한 선도-지연 관계 분석

황상욱,김은총 한국금융공학회 2024 금융공학연구 Vol.23 No.1

본 연구의 목적은 비정보기반투자자의 심리를 BERT 모형을 통해 계량화함으로써 투자자의 “심리”가 자산가격변화에 대해 예측력을 갖는지 선도-지연 관계에 대한 실증분석을 통해 살펴보는 것이다. 2018년 1월 1일부터 2020년 12월 31일까지의 시가총액 기준 상위 20개 개별종목의 일간 수익률, 국고채 3년물 금리, 그리고 각 개별종목에 대한 게시판 댓글들로 산출한 감성지수를 사용하여 감성지수와 위험조정수익률 간의 상관성을 확인하고자 우선 단순선형회귀분석을 진행하였다. 단순선형회귀분석 결과 감성지수와 위험조정수익률 사이에 통계적으로 유의한 관계가 있음을 확인하였다. 이 결과를 토대로 위험조정수익률과 감성지수의 선도-지연 관계를 분석하기 위해 VAR 분석, 그랜저 인과 분석, 충격반응분석 그리고 예측오차분산분해를 진행하였다. 분석 결과, 감성지수는 위험조정수익률에 선도하는 관계를 갖지 않고, 오히려 위험조정수익률의 감성지수에 대한 예측력이 통계적으로 유의미함을 확인하였다. 해당 분석 결과의 강건성을 확인하고자 Fama-French 3 Factor 모형과 자본자산가격결정 모형에서 도출한 회귀계수를 바탕으로 젠센의 알파를 유도하여 젠센의 알파와 감성지수 간의 선도-지연 관계를 살펴보기 위해 감성지수에 각각 -1, 0, +1 시차를 두고 회귀분석을 진행함으로써 감성지수가 초과수익률에 지연된 관계가 존재한다는 것을 확인하였다. 결론적으로, 비정보기반투자자투자자 심리의 과거 정보가 현재의 자산가격변화를 설명하지 못하고, 오히려 비정보기반투자자들의 현재 심리가 자산가격변화의 과거 정보에 의해 설명되고 있음을 발견하였다. The purpose of this study is to examine whether the investor’s sentiment has an predictive and explanatory power for asset price changes through an empirical analysis of the lead-lag relationship between uninformed investor’s sentiment and risk-adjusted returns. VAR model, Granger causality analysis, Impulse response analysis, and forecast error variance decomposition were conducted to analyze the lead-lag relationship between risk-adjusted returns and sentiment index. As a result of the analysis, it was confirmed that the sentiment index did not have a leading relationship with the risk-adjusted return rate, but that there was a statistically significant relationship in the delayed lag. In conclusion, it was found that the past information on investor sentiment of uninformed investors does not predict current change of asset price, but rather, the current sentiment of uninformed investors is predicted by lagged information on the change of asset price.

태권도 국가대표 선수들의 유산소성 운동능력 향상을 위한 단기간 간헐적 저산소 트레이닝 방법: 사례연구

황상욱 ( Hwang Sang-uk ),김정원 ( Kim Jeong-weon ),남상석 ( Nam Sang-seok ) 국기원 2020 국기원태권도연구 Vol.11 No.4

본 연구의 목적은 태권도 국가대표 선수에게 적용할 수 있는 저산소 트레이닝 방법을 제시하는데 있다. 본 연구에는 2,500m-3,000m 고도에 해당하는 저산소 환경에서 8명의 국가대표 태권도 선수들이 12일 동안 트레이닝을 실시하였다. 트레이닝 시 운동강도는 75-85% HRmax로 설정하였으며, 선수들은 저산소 환경에서 트레드밀 달리기(30분), 인터벌 훈련(30분), 자전거타기(30분)로 구성된 총 90분의 훈련을 매일 실시하였다. 유산소성 운동능력(PWC75% HRmax, PWC75% HRmax 도달시간)은 해수면 수준에서 자전거 에르고미터를 이용하여 트레이닝 전후에 각각 측정하였다. 그 결과, 5명의 선수들은 유산소성 운동능력이 향상되었으며, 나머지 3명의 선수들은 유산소성 운동능력이 감소하였다. 훈련 참여 조건과 개선 정도의 상관관계를 분석 한 결과, 계획된 훈련 프로그램을 성실히 수행한 선수들에게서 유산소 운동 능력 향상 효과가 나타났다. 이 결과는 이미 체력이 최고 수준에 도달한 국가대표 선수들도 단기간 저산소 트레이닝을 통해서 유산소 운동 능력을 더욱 향상될 수 있음을 보여주었다. 하지만 이러한 효과는 선수개인이 계획된 프로그램에 얼마나 충실하게 참여하느냐에 따라 달라질 수 있음을 시사한다. The purpose of this study is to suggest a method of hypoxic training applicable to taekwondo athletes. In this study, 8 Korean national taekwondo players trained for 12 days in a hypoxic environment at an altitude of 2,500m-3,000m. The exercise intensity was 75-85% maximum heart rate (HRmax), and the total 90 minutes of the daily exercise program were as follows: treadmill running (30 mins), interval exercise (30 mins), and cycling (30 mins). Aerobic exercise capacity (physical work capacity (PWC) 75% HRmax, PWC75% HRmax arrival time) was evaluated using a bicycle ergometer in sea level environment before and after training. As a result of training, the aerobic exercise ability of the five athletes improved, and the aerobic exercise ability of the other three athletes decreased. As a result of analyzing the correlation between the conditions of participation in training, and the degree of improvement, an improvement effect of aerobic exercise ability was found in athletes who faithfully performed the planned training program. These results showed that even national athletes whose physical strength has already reached the highest level could further improve their aerobic exercise ability through short-term hypoxic training. It suggests that adherence to the planned training regimen is key to its beneficial effects in athletes.

ASF 예측모델과 실측치를 이용한 영일만 해상 ASF 맵 생성기법

황상욱(Sang-Wook Hwang),신미영(Mi Young Shin),최윤섭(Yun Sub Choi),유동희(Donghui Yu),박찬식(Chansik Park),양성훈(Sung-Hoon Yang),이창복(Chang-Bok Lee),이상정(Sang Jeong Lee) 한국항해항만학회 2013 한국항해항만학회지 Vol.37 No.4

eLoran 시스템의 구축을 위해서는 기존 LORAN-C 설비의 보완과 데이터채널, dLoran 기준국, ASF 데이터베이스 등의 추가가 필요하다. 특히 항만접근 시 eLoran을 이용한 정밀 위치측정을 위해서는 항만 해역에 대한 ASF 랩이 반드시 이용자에게 제공되어야 한다. 본 연구에서는 eLoran 시스템의 주요 오차 요인인 항만에서의 ASF를 효율적으로 생성 및 보환하기 위하여, ASF 예측모델과 실측치를 이용한 ASF법 생성기법에 대해 연구하였다. 포항 LORAN-C 주국 (9930M) 에서 송신신호와 LORAN-C 수신기의 수신신호를 각각 세슘원자시계를 기준으로 측정하는 전파지연 측정법을 적용하여 ASF 실측치를 얻었고, ASF 예측법은 불규칙한 지형을 적용한 몬테스 모델로 구현하였다 본 논문에서는 영일만 해상 12 개 측정점에서의 ASF 실측값과 ASF 모델링을 통해 획득한 예측값의 옵셋을 보정하여 영일만의 ASF 랩을 생성하였다. In order to establish eLoran system it needs the betterment of a receiver and a transmitter, the add of data channel to loran pulse for loran system information and the differential Loran for compensating Loran-c signal. Precise ASF database map is essential it the Loran delivers the high absolute accuracy of navigation demanded at maritime harbor entrance. In this study we developed the ASF mapping method using predicted ASFs compensated by the measured ASFs for maritime in the harbor. Actual ASF is measured by the legacy Loran signal transmitted from Pohang station in the GRI 9930 chain We measured absolute propagation delay between the Pohang transmitting station and the measurement points by comparing with the cesium clock for the calculation of the ASFs. Monteath model was used for the irregular terrain along the propagation path in the Yeongil Bay. We measured the actual ASFs at the 12 measurement points over the Yeongil Bay. In our ASF-mapping method we estimated that the each offsets between the predicted and the measured ASFs at the 12 sα1Ced points in the Yeongil. We obtained the ASF map by adjusting the predicted ASF results to fit the measured ASFs over Yeungil bay.

고몰입조직(HIWP)과 팀 유효성의 관계에서 팀지향적 조직시민행동의 조절효과와 조직신뢰의 매개 효과

황상욱(Hwang, Sangwook),박계홍(Park, KyeHong) 한국인적자원개발학회 2017 인적자원개발연구 Vol.20 No.1

인터넷 기반 원격 공구마모 모니터링 및 설비 고장진단 시스템의 개발과 현장적용

황상욱(S. W. Hwang),홍대선(D. S. Hong),강효정(H.J.Kang),김정민(J.M.Kim),김종엽(J.Y.Kim) 한국정밀공학회 2013 한국정밀공학회 학술발표대회 논문집 Vol.2013 No.5월