다항식 신경회로망에 의한 고농도 오존 예측모델

김태헌,김성신,이종범,김신도,김인택,김용국 제어로봇시스템학회 1999 제어로봇시스템학회 국내학술대회 논문집 Vol.2 No.10

The Comparison of Oncologic Outcomes between Open and Laparoscopic Radical Nephroureterectomy for the Treatment of Upper Tract Urothelial Carcinoma: A Korean Multicenter Collaborative Study

김태헌,홍범식,서호경,강석호,구자현,정병창 대한암학회 2019 Cancer Research and Treatment Vol.51 No.1

Purpose We compared oncologic outcomes of patients with upper tract urothelial carcinoma (UTUC) who underwent open nephroureterectomy (ONU) or laparoscopic nephroureterectomy (LNU). Materials and Methods Consecutive cases of ONU and LNU between 2000 and 2012 at five participating institutions were included in this retrospective analysis. Clinical characteristics and pathologic outcomes were compared between the two surgical approaches. The influence of the type of surgical approach on intravesical recurrence-free survival (IVRFS), progression-free survival (PFS), cancer-specific survival (CSS), and overall survival (OS) was analyzed using the Kaplan-Meier method and differences were assessed with the log-rank test. Predictors of IVRFS, PFS, CSS, and OS were also analyzed with a multivariable Cox regression model. Results A total of 1,521 patients with UTUC were eligible for the present study (ONU, 906; LNU, 615). The estimated 5-year IVRFS (57.8 vs. 51.0%, p=0.010), CSS (80.4 vs. 76.4%, p=0.032), and OS (75.8 vs. 71.4%, p=0.026) rates were significantly different between the two groups in favor of LNU. Moreover, in patients with locally advanced disease (pT3/pT4), the LNU group showed better 5-year IVRFS (62.9 vs. 54.1%, p=0.038), CSS (64.3 vs. 56.9%, p=0.022), and OS (60.4 vs. 53.1%, p=0.018) rates than the ONU group. Multivariable Cox regression analyses showed that type of surgical approach was independently associated with IVRFS, but was not related to PFS, CSS, and OS. Conclusion Our findings indicate that LNU provided better oncologic control of IVRFS, CSS, and OS compared with ONU for the management of patients with UTUC.

2000년 시멘트산업의 유연탄 수요 전망

김태헌 한국시멘트협회 2000 시멘트 Vol.152 No.-

수술 가능한(UICC T병기 1, 2 및 3), Child A인 간세포암 환자의 초기 치료로서 수술적 절제술과 경동맥 항암색전술의 생존율 비교

김태헌,이태림,이효석,김정룡,윤정환,우광훈,김강모 대한소화기학회 2000 대한소화기학회지 Vol.35 No.5

Background/Aims : This study was designed to compare the survival rates of patients with hepatocellular carcinoma (HCC) who were treated either with surgical resection (SR) or transarterial chemoembolization (TACE). Methods : From 1993 through 1994, 183 patients with HCC in UICC T1-3N0M0 and liver function of Child-Pugh class A were enrolled. The patients were divided into two groups (SR group and TACE group) according to the treatment modality. Stratification was performed according to the tumor stage (UICC or CLIP) and the degree of lipiodol retention. Survival rates of SR group and TACE group were compared. Results : When the both groups were stratified with UICC T stage, median survival of SR group and TACE group was 54 and 31 months, respectively, in UICC T1 HCC (p=0.0998), 65 and 37 months in T2 (p=0.0154), and 14 and 27 months in T3 (p=0.5432). In the stratification with CLIP stage, median survival of SR group was significantly longer in CLIP 0 or 1 HCC patients than that of TACE group. In the patients showing compact lipiodol uptake, median survival of SR group and TACE group in UICC T1 and T2 was 65 and 50 months (p=0.1529), and 65 and 48 months in CLIP 0 (p=0.1012), respectively. Conclusions : When compact lipiodol uptake is observed, repeated TACE may be as effective as surgery in patients with HCC of UICC T1, 2 or CLIP 0, as well as the patients with more advanced HCC.

Prognosis in the Patients with Prolonged Extracorporeal Membrane Oxygenation

김태헌,임청,박일,김동진,정요천,박계현 대한흉부외과학회 2012 Journal of Chest Surgery (J Chest Surg) Vol.45 No.4

Background: Prolonged usage of extracorporeal membrane oxygenation (ECMO) may induce multi-organ failure. This study is aimed to evaluate prognostic factors in the patients with ECMO. Also, the prognosis of ECMO with Kidney Injury Network Scoring system is studied. Materials and Methods: From May 2005 to July 2011, 172 cases of ECMO were performed. The cases of perioperative use of ECMO were excluded. Renal failure patient and younger than 15 years old one were also excluded. As a result, 26 cases were enrolled in this study. Male patients were 15 (57.7%), and mean age was 56.57±17.03 years old. Demographic data, ECMO parameters, weaning from ECMO, and application of continuous renal replacement therapy are collected and Acute Kidney Injury Network (AKIN) scores were evaluated just before ECMO and day 1, day 2 during application of ECMO. Results: Venoarterial ECMO was applied in 22 cases (84.6%). The reasons for applications of ECMO were cardiac origin in 21 (80.8%), acute respiratory distress syndrome in 4, and septic shock in 1 case. Successful weaning from ECMO was achieved in 15 cases (57.7%), and survival discharge rate was 9 cases (34.6%). Mean duration of application of ECMO was 111.39±54.06 hours. In univariate analysis, myocarditis was independent risk factors on weaning failure. Using the receiver operating characteristic curve, level of hemoglobin on 24 hours after ECMO, and base excess on 48 hours after ECMO were showed more than 0.7. AKIN score was not matched the prognosis of the patients with ECMO. Conclusion: In our study, the prognosis of the patients with myocarditis was poor. Hemoglobin level at first 24 hours, and degree of acidosis at 48 hours were useful methods in relating with prognosis of ECMO. AKIN scoring system was not related with the prognosis of the patients. Further study for prognosis and organ injury during application ECMO may be needed.

한·일 자동차산업의 대(對)인도네시아 수출경쟁력 비교연구

김태헌 경희대학교(국제캠퍼스) 국제지역연구원 2021 아태연구 Vol.28 No.3

This study aims to examine the problems for enhancing the export competitiveness of the Korean automobile industry in the era of CEPA in Indonesia by comparing and analyzing the export competitiveness of the Korean and Japanese automobile industries in Indonesia. In this study, we analyzed the Revealed Comparative Advantage Index (RCA), Comparative Advantage by Country (CAC), and Export Similarity Index (ESI). The analysis results showed that Korea is in a comparative heat state compared to Japan in the main export items such as passenger cars (8703), freight cars (8704), automobile chassis (8706), automobile parts/arrangements (8708), and motorcycles (8711). Japan has a comparative advantage in finished car sector of automobiles, vans, freight cars and motorcycles, as well as in the parts/equipment sectors that support the assembly production of overseas production bases. In particular, Korea has generally inferior competitiveness of most items in the Indonesian market, but in contrast, Japan has far superior competitiveness in the Indonesian market than the global market in most items. Meanwhile, the group with the most intense export competition in the Indonesian market in 2019 was the Japan-India group for HS87 items, and the German-Japanese group for HS8703 items. In the Indonesian automobile market, the so-called “four-party competition” has been formed between Japan, the UK, India and Germany, while relatively low competition between Korea and Japan has been formed. Therefore, the Korean automobile industry should enhance the competitiveness of exports to Indonesia with the entry into force of Korea-Indonesia CEPA, and learn thoroughly about the past experience of Hyundai Motor's failure to advance into Indonesia and the success factors of Japanese automobiles in Indonesia, and actively seek ways to advance into the local market, such as establishing a joint venture for local production of eco-friendly electric vehicles and developing a local specialization model. 본 연구는 인도네시아시장에서 현시되고 있는 한‧일 자동차산업의 수출경쟁력을 비교 분석함으로써 향후 본격적으로 전개될 한-인도네시아 CEPA시대의 한국자동차산업의 수출경쟁력 제고를 위한 문제점을 사전 점검해 보는 데 소기의 목적을 두고 있다. 연구에서는 현시비교우위(RCA), 국별 비교우위(CAC), 수출경합도(ESI) 분석이 시도되었다. 분석결과, 한국은 주력수출품목인 승용자동차(8703), 화물자동차(8704), 자동차 섀시(8706), 자동차 부품/부속품(8708), 모터사이클(8711) 부문에서 일본에 비교열위상태인 것으로 나타났다. 일본은 승용차, 승합차, 화물자동차, 모터사이클과 같은 완성차 부문과 해외생산기지의 조립생산을 뒷받침하는 부품/부속품 부문에서 절대적 비교우위 경쟁력을 확보하고 있는 특징을 보였다. 특히 한국은 인도네시아시장에서 대다수 품목군의 경쟁력이 대체로 열세이지만, 그와 대조적으로 일본의 경우는 대다수 품목군에서 글로벌시장보다 인도네시아시장에서의 비교우위경쟁력이 월등히 앞서 있는 것으로 확인되었다. 2019년 인도네시아시장에서 수출경합이 가장 치열한 그룹은 HS87류의 경우 ‘일본-인도’ 그룹이었으며, HS8703호는 ‘독일-일본’ 그룹이었다. 인도네시아 자동차시장에서는 일본, 영국, 인도, 독일 간의 4자 경쟁구도가 형성되어 있는 가운데, 한·일 간에는 상대적으로 낮은 경합관계가 형성되고 있는 것으로 나타났다. 따라서 한국의 자동차업계는 한-인도네시아 CEPA 발효를 계기로 대(對)인도네시아 수출경쟁력을 제고시키는 한편, 과거 현대자동차의 인도네시아 진출 실패경험과 일본자동차의 인도네시아 성공요인을 철저히 학습하여 친환경 전기자동차의 현지생산을 위한 합작법인 설립, 현지특화모델 개발 등 실현가능한 현지진출방안들을 적극 모색하여야 할 것으로 보인다.

東아시아地域에서 ASEM의 經濟的 意義와 EU-ASEAN+3間의 國際貿易關係

김태헌 한몽경제학회 2002 韓蒙經濟硏究 Vol.9 No.-

누진제 완화와 전력사용량 변화: 매칭이중차분법을 활용한 주택용 전기요금 개편 효과 분석

김태헌,배관표 한국정책분석평가학회 2023 政策分析評價學會報 Vol.33 No.1

In December 2016, the government implemented changes to the electricity supply contract, including a revision of the progressive electricity rate system for residential use. The progressive rate system was significantly relaxed by revising the existing six-stage 11.7 times progressive structure to a three-stage 3 times structure, which had not been revised since 2004. Before the policy change, there were concerns that if electricity rates were reduced by relaxing the progressive rate system, household burdens would be reduced but ultimately lead to overconsumption of electricity. This study empirically analyzed changes in electricity usage levels. The results from 2016 and 2017 using matching difference-in-differences showed a 12% decrease in electricity usage after the rate system revision. Excluding the summer period when temperature has a significant impact, a 12.9% decrease was confirmed. To compensate for the short period of analysis, we analyzed periods from 2015 to 2018 before and after policy implementation and confirmed that the same trend was observed. This indicates that electricity usage did not increase significantly even if the progressive rate system was relaxed in the 201~400kWh range. As this trend can change in the long term, there is a need for follow-up studies that track the effects of progressive rate system relaxation over a long period of time. 2016년 12월, 정부는 주택용 누진제 개편을 포함한 전기공급약관 변경을 시행하였다. 누진제 개편은 2004년 이후 12년 만에 이루어진 것으로 기존 6단계 11.7배수의 누진구조를 3단계 3배수로 대폭 완화하였다. 제도 개편 전, 누진제 완화로 요금이 인하되면 가계 부담은 줄지만, 결국 전력 과소비가 발생할 것이라는 우려가 컸다. 이에 본 연구는 전력사용량 변동 수준을 실증분석으로 확인하였다. 2016년과 2017년 자료를 매칭이중차분법으로 분석하여 요금제 개편 전후의 변화를 측정한 결과 12%의 전력사용량 감소를 보였다. 기온이 영향이 큰 여름철 기간을 제외하고 분석하자 12.9%의 감소가 확인되었다. 기간의 짧음을 보완하기 위해 정책시행 전후 2년으로 시계열 길이를 늘려 2015년과 2018년 기간을 분석하여도 동일한 추세가 확인되었다. 이는 201∼400kWh 구간에서는 누진제를 완화해도 전력사용량이 크게 늘지는 않았음을 나타낸다. 이 같은 추세는 장기적으로 변화될 수 있으므로 누진제 완화의 효과를 장기간 추적하는 후속 연구의 필요성이 제기된다.

기체분리용 고분자 멤브레인의 최근 개발 동향

김태헌,정중채,박종만,우창화 한국막학회 2010 멤브레인 Vol.20 No.4

가스분리막을 이용한 분리공정은 기존의 분리공정을 대체할 공정으로서 수십 년간 발전이 되어 왔다. 특히 분리막 공정은 가스분리에 있어서 기존공정에 비해서 에너지 소모가 적고 설치에 필요한 공간이 간소하며, 스케일업이 간단한 장점이 있다. 최근에는 기체분리막 공정은 질소발생장치, 수소발생장치, 막제습기, 선박이나 항공기용 불활성기체충진장치, 천연가스 정제, 바이오가스 정제, 연료전지분야에서 널리 사용이 되고 있으며, 향후에는 이산화탄소의 분리에도 강력한 대체공정으로 사용이 될 수 있다. 이러한 가스분리막 공정을 좀 더 널리 보급하기 위해서는 로베슨 플롯의 한계를 넘어설 수 있는 새로운 소재의 개발이 절실하며, 이러한 한계를 돌파하기 위하여 많은 연구자와 회사들이 카도그룹이나 스피로 구조를 가지는 고분자나 PIMs 같은 소재의 개발에 박차를 가하고 있다. Gas separation membranes have been developed for decades in various areas to replace the conventional processes. Membrane processes for gas separation have many advantages of energy saving, compact size, and easy scale-up. Nowadays, gas separation processes is widely spreaded in nitrogen generating system, hydrogen generating system, membrane dryer, on board inert gas generating system, natural gas purification, biogas purification and fuel cells. Carbon dioxide separation process using membrane would be a strong candidate of carbon dioxide capturing process. In order to broaden the scope of application of gas separation membranes, development of new materials which can overcome the borderline of Robeson's plot should be necessary, so that many researchers and companies are trying to develop the new materials like polymers containing cardo and spiro group and PIMs (polymers for intrinsic microporosity).

주요국 에너지상대가격 비교 분석 연구

김태헌 에너지경제연구원 2016 에너지경제연구원 수시연구보고서 Vol.- No.-