장파장용 편광유지 광섬유 제조 기술 - 집적광학기술과 특수광섬유 개발의 일부임 - ( Fabrication Technology of Polarization Maintaining Optical Fibers for Near-Infrared Wavelength )

김상혁,이상배,조재철,최상삼 대한전자공학회 1988 특정연구 결과 발표회 논문집 Vol.- No.-

소음인 진단지표로서 소화 관련 항목에 대한 고찰- 음식불선화는 소음인의 진단지표인가

김상혁 사상체질의학회 2022 사상체질의학회지 Vol.34 No.2

Objectives Recent studies have reported that the digestion-related items contribute significantly to the diagnosis of constitution, though these were not described as the indicator for diagnosing Sasang constitution in Donguisusebowon(東醫壽世保元) 「Sasanginbyeonjeunglon(四象人辨證論)」. The purpose of this study was to explore the reasons why such a gap appeared. Methods The digestion-related items and their rationales to be shown in eleven studies on the Questionnaire for Sasang Constitution Diagnosis were reviewed. Thirty primary studies included in two systematic reviews were also reviewed to reconsider the significance of digestion-related items as an indicator for diagnosing Soeumin. Results & Conclusions A few pathways were found in studies on the Questionnaire for Sasang Constitution Diagnosis, which could overestimate the significance of digestion-related items more than actual. Besides, in the primary studies included in two systematic reviews, there was also a possibility of overestimating the importance of digestion-related items due to some biases in the selection of subjects and the conducting of the study. Therefore, there might be room for reconsideration that indigestion was necessarily an indicator for diagnosing Soeumin.

Transformation of Ginsenoside-rich Fraction Isolated from Ginseng (Panax ginseng) Leaves Induces Compound K

김상혁,김성영,이호,나경수,서형주,김선영,신광순 한국식품과학회 2011 Food Science and Biotechnology Vol.20 No.5

To develop the new physiologically active materials from ginseng (Panax ginseng C.A. Meyer)leaves, the ginsenoside-rich fraction (GL-1) was isolated and transformed into highly absorbable metabolites in the gastrointestinal (GI) tract. To transform the ginsenosides in GL-1 into deglycosylated ginsenosides, GL-1 was treated with organic acids (0.1 and 1% lactic and acetic acid solutions) and fermented with isolated strains (P1-P4, and M3) from red ginseng extract for 7 days. The treatment of 0.1% lactic acid of GL-1 induced the highest transforms of partially-deglycosylated ginsenosides such as Mc, F2, and Rg3 (intermediate metabolites). On the other hand,Compound K (Compd K, final metabolite) contents in GL-1 ferments with strain M3 showed about 6-time higher than that of control (not fermented). Consequently, the strain M3 was finally selected for the mass production of Compd K with well-absorbable property in GI tract and physiological activity.

Sn 도금을 통한 PCB 기판상의 솔더 범프 제작 및 미세조직 분석

김상혁,김성진,신한균,박현,허철호,문성재,이효종 대한금속·재료학회 2021 대한금속·재료학회지 Vol.59 No.4

To manufacture finer solder bumps, the SR and DFR patterns were filled using a Sn electroplating process instead of the microball process currently used in BGA technology, and the solder bump shape was fabricated through a reflow process. The microstructure of the solder bump was investigated by EBSD and TEM measurements. The EBSD results showed that the grain size of the Sn structure became finer after the reflow treatment and a scallop shape of Cu6Sn5 was formed on the Cu UBM. However, the Cu3Sn phase was difficult to measure in the EBSD measurement. The Cu3Sn compound could be investigated with TEM analysis. The Cu3Sn phase also existed in the Sn region, with a size of several tens of nanometers, due to the eutectic reaction. The volume fraction of the Cu6Sn5 phase in the Sn region could be calculated from the TEM image, and the concentration of copper dissolved in the liquid tin during the reflow process could be estimated from the volume fraction. It was possible to observe the Cu3Sn and Cu6Sn5 lattice images through high resolution TEM analysis, but it was difficult to observe the lattice coherency between the two phases because both were polycrystalline. Based on the results of this study, it is expected that solder bumps with a diameter of less than 100 μm can be robustly manufactured through the Sn electroplating process.

Reexamining Determinants of FDI Using Dynamic Panel Quantile Regression Analysis: Evidence of Korea

김상혁,양재훈 한국무역학회 2014 Journal of Korea trade Vol.18 No.4

The primary objectives of this study are to identify the determinants of FDI inflows to host countries with selected variables by using a panel quantile regression model, and to examine whether the different levels of FDI inflows to host countries are differently related to the determinants of FDI inflows. The time-series annual panel data from 1995 to 2012 regarding Korea’s FDI inflows was gathered from several secondary databases. The previous empirical results from the conditional mean-based models for FDI inflows to South Korea are not informative: most of the estimated coefficeints are statistically insignificant. It implies the determinant of FDI inflows can be quite heterogeneous; that is, the determinants may differ depending on the level of FDI. Thus, the dynamic panel quantile regression model is used to show that the determinants of FDI woulddiffer based on the level of FDI inflows. To be more specific, the GDP, employment, and human resources education levels of the host country are significant determinants of FDI inflows only when the level of the inflow is low. However, corruption and anti-environment investment levels are statically significant determinants for middle- and high-level FDI inflows. This result suggests that the government should have policies to decrease the degree of corruption and increase anti-environment pollution investment in order to realize increases in FDI inflows.

위성 영상을 활용한 두 가지 현열 플럭스 추정 방법 간의 비교

김상혁,이동근 한국환경영향평가학회 2022 환경영향평가 Vol.31 No.1

도시 지역의 열 환경을 파악하기 위해 열 플럭스를 추정하고자 하는 연구들이 많이 진행되어 왔다. 현재 다양한 방법을 통해 현열 플럭스가 추정되고 있으나 각 방법 간의 차이를 비교하는 연구는 매우 미흡한 실정이다. 따라서 본 연구는 대표적인 두 가지 현열 플럭스 추정 방법을 통해 동일한 대상지의 현열 플럭스를 추정하고 그 결과를 비교하여 방법 간의 의의와 한계를 확인하고자 하였다. 연구 결과 열수지 방정식 방법을 통해 현열 플럭스를 추정할 경우 해상도면에서 큰 장점을 가지나 도시 지역의 특징 중 하나인 인공열을 반영하지 못해 현열이 과소추정될 수 있음을 확인할 수 있었다. 물리식을 기반으로 추정할 경우 상대적으로 오차가 작고 인공열의 반영이 가능하나, 시간 및 공간 해상도에 있어 한계가 있음을 확인하였다. 두 방법은 인공열이 많이 발생하는 공업지역에서 가장 큰 차이를 나타냈으며 그 차이는 평균 약 135 W/m2 , 최대 400 W/m2 로 나타났다. 반면 녹지 및 수변공간은 약 20 W/m2 로 두 방법 간의 차이가 매우 작은 것을 확인할 수 있었다. 두 방법 간의 결과가 도시 지역에서 유의미한 차이를 보이는 만큼 향후 연구 목적에맞는 방법을 선택할 필요가 있다.

악심(惡心) 구토(嘔吐)를 주소(主訴)로 하는 태음인(太陰人) 소뇌경색(小腦硬塞) 환자(患者) 치험(治驗) 1례(一例)

김상혁,석재화,이갑수,최경주,함통일,황민우,이의주,송일병,고병희,Kim, Sang-Hyuk,Seok, Jae-Hwa,Lee, Kab-Soo,Choi, Kyung-Ju,Ham, Tong-Il,Hwang, Min-Woo,Lee, Eui-Ju,Song, Il-Byung,Koh, Byung-Hee 사상체질의학회 2006 사상체질의학회지 Vol.18 No.2

1. Objectives This case is to report that a Taeumin patient with nausea and vomiting treated by Taeumin's Contitutional medications. 2. Methods This patient was treated by several Constitutional medications and acupuncture treatment according to the result of Sasang Constitutional diagnosis with western management. We used Visual analogue scale(VAS) for the assessment of nausea and vomiting. 3. Results and Conclusions This patient's chief complaints were nausea and vomiting. So She was treated by Taeumin's Constitutional medications(especially Galgeunhaegui-tang, Cheongsimyeonja-tang) and showed a positive response about her symptom. Bur then we consider that studies about that case like this are mote needed.

Is the Cross-sectional Area after Unilateral Open Door Laminoplasty Wider than that after Midline Splitting Laminoplasty ? : Mathematical Approach

김상혁,김은상,어환,장일태,최상은 대한척추신경외과학회 2013 Neurospine Vol.10 No.4

Objective: The aim of this study was to compare geometrically cross-sectional areas of two different laminoplasty techniques in same opening size. Some investigators have studied the expanded areas of the two different techniques using imaging study. Although it is unclear that postoperative spinal canal is correlated with the surgical outcome we just focused on mathematical and geometrical correlation of the expandable area with surgical opening size in different laminoplasty techniques. Methods: To predict the expandable area by a midline splitting technique and a unilateral open door technique, we placed an imaginary isosceles triangle in the spinal canal and drew graphs for the equation of the expandable areas in same opening size using the Pythagorean theorem and mathematical program. To substitute the constant figures of mathematical formula we estimated the normal cervical spine CT scans of 50 Korean adults. Results: We subtracted the imaginary triangle from the spinal canal and were left with the remaining area of the spinal canal that was not changed before and after surgery. In same opening size the expandable area by the midline splitting technique was same but slightly wider than the unilateral open door technique, irrespective of the triangular shape. For a normal isosceles triangle the results were the same. Conclusion: Using mathematical proof, the expandable area after the midline splitting technique was same but slightly larger than that after the unilateral open door technique, irrespective of the size of the lamina opening.

기도하는 자

김상혁 천년의시작 2010 (계간)시작 Vol.9 No.4

쓴다

김상혁 천년의시작 2010 (계간)시작 Vol.9 No.4