한국 수입 쇠고기 시장의 과점 형태 분석

이석일,김선웅,윤병삼 한국농식품정책학회 2023 농업경영정책연구 Vol.50 No.2

The United States and Australia are two major beef exporters to South Korea. This study primarily aims to determine the oligopolistic market structure in the Korean beef import market. Considering two different strategic variables in the oligopolistic market, quantity and price, six oligopolistic competition models were estimated. To select among the six models, various model fit indices and normalized likelihood ratio statistics were used. For other cuts with bone in of the fresh or chilled beef, the model that best fit the data was the Stackelberg model with US quantity leadership. But, for boneless of the fresh or chilled beef, other cuts with bone in of the frozen beef, and boneless of the frozen beef, the model that best fit the data was the Stackelberg model with Australia quantity leadership. Overall, this study shows that the quantity models fit the data better than price models to explain the oligopolistic market structure in the Korean beef import market.

청각장애학교의 개별화 교육 실천 사례

이석일 국립특수교육원 1996 국내세미나 자료집 Vol.- No.3

펄프 수입가격과 수입량 및 해상운임지수 간의 동태적 인과관계 분석

이석일,윤병삼 한국펄프.종이工學會 2022 펄프.종이기술 Vol.54 No.4

This study investigates the dynamic causal relationships among import price, import quantity, and ocean freight rate index in the chemical pulp market. The Johansen cointegration test was applied to determine the cointegration among the three time series variables in this study, demonstrating their long run equilibrium relationship. Results of the vector error correction model (VECM) indicated that the pulp import quantity has an error correction mechanism that leads to convergence toward the long run equilibrium level or steady state. Furthermore, the Granger causality test results revealed a unidirectional causal relationship between the ocean freight rate index and quantity of wood pulp imported, implying that ocean freight rates influence the quantity of wood pulp imported. Moreover, the results of impulse response analysis revealed that an increase in ocean freight rate index shock has a notably negative impact on pulp import quantity, leading to the general decrease in import quantity in both the short and long run. .

대구광역시 일부 지하 환경에서 하 동절기중 포름알데히드 농도에 관한 연구

이석일 한국위생과학회 1997 한국위생과학회지 Vol.3 No.1

A pilot study was conducted in order to measure indoor and outdoor formaldehyde levels during July 29∼ August 16 of summer in 1996 and January 6∼24 of winter in 1997 in the several same underground space in Taegu city. Formaldehyde concentrations were monitored during 1 week in selected sampling areas(underground shopping center and underground parking lot) using passive formaldehyde monitors. The research findings are as follows: Mean concentration of formaldehyde was 122 ppb during summer days and 112 ppb during winter days in the under ground shopping center and 134 ppb in summer days and 103 ppb in winter days in the underground parking lot. In the case of Daesin underground shopping center, there was the highest number, 158 ppb in summer days and 141 ppb in winter days center and there was lower than 86 ppb in the outdoor. In the underground parking lot, the first basement of Seomoon market had 166 ppb in summer days which is the highest and the first basement of the Grand hotel in the winter had 120 ppb which is the highest. Taegu department store underground parking lot had more than 100 ppb during summer days and lower than Air Quality Criteria in winter days even in the outdoor. When concentration of indoor and outdoor of underground was compared, formaldehyde of indoor was varied from 81 ppb to 166 ppb in summer days and from 74 ppb to 141 ppb in winter days. The measured number of outdoor was varied from 41 ppb to 110 ppb during summer days and from 24 ppb to 89 ppb during winter days. In case of 22 point of 5 areas in underground space, 91% had more than Air Quality Criteria during summer and 68% had more than Air Quality Criteria during winter.

보험의학에서 단순 흉부X선의 이용

이석일,Lee, Suk-Yl 한국생명보험의학회 1998 保險醫學會誌 Vol.17 No.-

WEATHER AND GEOGRAPHIC EFFECTS ON SUGARCANE APHID MIGRATION IN OKLAHOMA

이석일 한국농식품정책학회 2022 한국농식품정책학회 학술대회 논문집 Vol.2022 No.8

수입 펄프가격과 고지가격간의 동태적 인과관계 분석

이석일,윤병삼 한국펄프·종이공학회 2023 펄프.종이기술 Vol.55 No.2

This study investigates the dynamic causal relationships among imported pulp prices (HwBKP, SwBKP) and waste paper prices (OCC, ONP). The Johansen cointegration test showed that there existed a long-run equilibrium relationship among four time series variables in this study. Results of the vector error correction model (VECM) indicated that the pulp and waste paper prices had their own error correction mechanisms that lead to convergence toward the long run equilibrium level or steady state. Furthermore, the Granger causality test revealed a bidirectional causal relationship between the pulp prices (HwBKP ⇔ SwBKP), a unidirectional causal relationship between the pulp and waste paper prices (HwBKP ⇒ ONP), and a unidirectional causal relationship between the waste paper prices (OCC ⇒ ONP). Moreover, the results of variance decomposition analysis revealed that the variance of HwBKP and OCC prices primarily reflected own shocks in both the short and long run. .

대기오염물질의 흡착제로 이용되는 제올라이트의 구조연구

이석일 한국위생과학회 1999 한국위생과학회지 Vol.5 No.1

The crystal structure of hydrated Rb₃Na_8H-A(R₁ = 0.0738, R₂ = 0.0987 and a = 12.287(2) A) has been studied by single-crystal x-ray diffraction methods in the cubic space group Pm 3m in order to understand the structure of the zeolite, as adsorbent and decapsulation processes of gas molecules. The exact composition of hydrated Rb₃Na_8H-A is appeared to be Rb₃Na_8H-A · 23H₂O, according to the result of crystallographic refinement. The most prominent difference between hydrated and dehydrated one is the position of one Rb^+ ion which was located an 8-ring in the dehydrated Rb₃Na_8H-A and moved to the 3-fold axis opposite 6-ring in the large cavity upon hydration. This movement of Rb^+ ion, resulting in one empty 8-ring among three of them per unit cell, enables the decapsultion of encapsulated gas moleulese upon hydration. In the large cavity of Rb₃Na_8H-A - 23H₂O, 7 water molecules at O(4) are arranged and are coordinated to 3 waters at O(5). Some of them are shared with adjacent waters at O(4) and water molecules at O(5) are coordinated to Rb+ ion at Rb(2). Four Na+ ions per unit cell have trigonal bipyramid geometry each with one water molecules at O(6) in sodalite unit and three oxide ions of framework and water molecule at O(4) in large-cavity. The other three Na^+ ions are coordinated tetrahedrally each with one water molecule at O(4) in large-cavity and three oxide ions of framework.

폐타이어 재 자원화를 위한 연구

이석일 한국환경보건학회 2000 한국환경보건학회지 Vol.26 No.4

Compared to other waste, waste tire has much discharge quantity and calorie. When we use waste heat from waste tire, it can be definitely better substitute energy than coal and anthracite in high oil price age. To use as a basic data for providing low cost and highly effective heating system, following conclusion was founded. Annual waste tire production was 19,596 million in 1999, Recycling ratio was almost 55% and more than 8.78 million was stored. Waste tire has lower than 1.5% sulfur contain ratio which is resource of an pollution, So it is a waste fuel which can be combustion based on current exhaust standard value without any extra SOx exclusion materials. Waste tire has 9,256Kcal/kg calorific value and it is higher than waste rubber, waste rubber, waste energy as same as B-C oil. When primary and second air quantity was 1.6, 8.0 Nm3/min, dry gas production time was 270min and total combustion time was 360 min. In the SOx, NOx, HC of air pollution material density were lower than exhaust standard value at the back of cyclone and dusty than exhaust standard value without dust collector.

보리등겨로 제조한 메주와 간장의 맛성분 특성

이석일 한국위생과학회 2002 한국위생과학회지 Vol.8 No.2

새로운 장류제품으로서 보리등겨로 메주와 간장을 만들어 발효기간에 따른 맛성분 변화를 검토하였다. 보리메주에서는 유리당이 7종이 검출되었고 보리간장은 5종이 검출되었다. 휘발성 유기산은 보리메주와 보리간장 각각 3종만이 검출되었다. 비휘발성 유기산은 보리메주가 4종이 검출되었고 보리간장은 8종이 검출되었다. 보리메주의 총 유리아미노산은 596.3~1580.8 mg% 였으며, glutamic acid>alanine>leucine등의 순으로 높았다. 총 필수아미노산의 함량은 총 아미노산에 대해 33.29~40.38%였다. 보리간장의 총 유리아미노산은 342.0~803.6 mg%였으며, glutamic acid>proline>phenylalanine등의 순으로 높았다. 총 필수아미노산의 함량은 총 아미노산에 대해 25.7~37.3%였다. For investigation of new utilization as jang-products, the changes in taste components of Meju and kanjang made with barley bran during fermentation time were examined. Barley meju of 7 free sugars(i.e., raffinose, stachyose, inositol, fructose, glucose, arabinose, and maltose), 3 volatile organic acid(i.e., acetic, propionic acid, and butyric acid) and 4 non-volatile organic acid(i.e., fumaric acid, α-ketoglutaric acid, malic acid, and citric acid) were detected. Barley kanjang of 5 free sugars(i.e., arabinose, xylose, fructose, glucose and maltose), 3 volatile organic acid(i.e., acetic acid, propionic acid, and butyric acid) and 8 non-volatile organic acid(i.e., lactic acid, fumaric acid, levulinic acid, succinic acid, malic acid, α-ketoglutaric acid, citric acid and pyroglutamic acid) were detected. As barley meju was fermented, content of free amino acid was 596.3~1580.8 mg%. Glutamic acid was most abundant component among the amino acids, followed by alanine and leucine. Essential amino acid content accounted for 33.2~40.38%. As barley kanjang was fermented, content of free amino acid was 342.0~803.6 mg%. Glutamic acid was most abundant component among the amino acids, followed by proline and phenylalanine. Essential amino acid content accounted for 34.3~37.3%.