Atmospheric drag force is an important source of perturbation of Low Earth Orbit (LEO) orbit satellites, and solar activity is a major factor for changes in atmospheric density. In particular, the orbital lifetime of a satellite varies with changes in solar activity, so care must be taken in predicting the remaining orbital lifetime during preparation for post-mission disposal. In this paper, the System Tool Kit (STK®) Long-term Orbit Propagator is used to analyze the changes in orbital lifetime predictions with respect to solar activity. In addition, the STK® Lifetime tool is used to analyze the change in orbital lifetime with respect to solar flux data generation, which is needed for the orbital lifetime calculation, and its control on the drag coefficient control. Analysis showed that the application of the most recent solar flux file within the Lifetime tool gives a predicted trend that is closest to the actual orbit. We also examine the effect of the drag coefficient, by performing a comparative analysis between varying and constant coefficients in terms of solar activity intensities.

유명한 예일대 역사가 케네스 스코트 라투레트(Kenneth Scott Latourette, 1884–1968)는 기독교의 전 역사를 ‘확장’(expansion)이라는 맥락에서 해석하며, 특히 ‘예수의 영향력 확장’이라는 주제를 자신의 역사관으로 설정하고 이 사상을 일평생 유지했다. 그렇다면 그는 이 사상은 언제 그의 역사관과 선교관으로 확정했을까? 일반적으로 1937년 이래 수년에 걸쳐 출판된 『기독교확장사』(A History of Expansion of Christianity, 1937-45)가 그의 이런 역사관이 구체화되는 시기라고 주장되는데, 그렇다면 그 이전에는 라투레트에게 이런 역사관이 없었을까? 1937년 이후 확고히 정립되는 ‘예수의 영향력 확장’으로서의 기독교 역사라는 표현 자체는 1929년에 출판된 첫 기독교 역사 관련 저작 『중국기독교선교역사』에는 등장하지 않는다. 그러나 라투레트가 이 책에서 기독교 선교사를 중국 사회에 영향을 끼치는 서구의 대리자로 묘사할 때, 독자는 그가 1937년 이후 저술에서 등장하는 ‘예수의 영향력 확장’으로서의 기독교 선교역사라는 개념과 거의 같은 인식을 하고 있음을 쉽게 파악할 수 있다. 이 책에서 ‘중국에 끼친 서구의 영향력’이라는 표현으로 자주 등장하는 명제는 사실상 ‘서구’를 ‘기독교’로, 또 ‘기독교’를 ‘예수’로 바꾸어도 무방하다. 즉, 1937년 『기독교확장사』 이후에 구체화되는 명제가 이미 1929년 저작에서 배아의 형태로 표명되어 있었다는 것이다. 『중국기독교선교역사』는 단순히 ‘명제’에서만 1937년 이후 작품들의 선구적 배아가 아니었다. 공정하고 편파적이지 않기 위해 기독교역사 해석은 반드시 여러 교파를 통합과 비교의 방식으로 분석해야 한다는 에큐메니컬적 역사기술, 또한 예수의 영향력은 교회에만 머무는 것이 아니므로, ‘교회사’가 아니라, 반드시 교회 바깥의 모든 영역을 포괄적으로 기술하는 ‘기독교사’가 되어야 한다는 인식, 기독교 신앙이 선교를 통해 퍼져나갈 때, 이는 마치 파도의 고저, 밀물과 썰물의 반복되는 양상처럼 진보와 후퇴를 반복하지만 결국에는 전진한다는 믿음 등, 1937년 이후 작품에서 구체화된 라투레트의 모든 역사기술 방법론과 관점은 사실상 1929년의 『중국기독교선교역사』에도 흔적이 두드러진다. 따라서 선교사와 선교활동의 공헌을 지나치게 긍정적으로 보고, 결국에는 기독교의 확장으로 역사가 진보할 것이고 윤리가 개선될 것이라 믿는 이상적이고 순진하고 낙관주의적인 승리주의 역사관이라고 라투레트의 후기 저작을 비판하는 목소리 또한 이미 1929년에 출판된 『중국기독교선교역사』에도 적용될 수 있다. 이 점에서 『기독교확장사』(A History of Expansion of Christianity, 1937-45), 『아노 도미니: 예수, 역사, 하나님』(Anno Domini: Jesus, History, and God, 1940)과 『꺼지지 않는 빛』(The Unquenchable Light, 1941), 『기독교사』(A History of Christianity, 1953), 『혁명시대의 기독교』(Christianity in a Revolutionary Age, 1958-62), 『기독교의 역사』(Christianity through the Ages, 1965) 같은 라투레트의 후기 대작은 모두 『중국기독교선교역사』에 빚을 지고 있다.

이 논문은 심프슨(A.B. Simpson)에 대한 선행연구가 지나치게 서양 관점에서 진행되었음을 지적하고, 동서양의 종교가 충돌하고 서양에 아시아 선교 열풍이 불 무렵에 심프슨의 사상과 사중복음(the Fourfold Gospel)이 체계화되었음을 알리고자 한다. 예컨대, 밴 더 월(Burnie Van De Walle, 2009)은 사중복음 형성 배경이 네 가지라고 분석했는데, 그것은 18·19세기의 서양 “부흥운동”(Revivalism), 요한 웨슬리가 시작한 “성결운동”(the Holiness Movement), 스위스 뮈네도르프에서 기인한 “신유 운동”(the Divine Healing Movement), 비관적 시대상을 반영한 “전천년설”(Premillennialism) 등이다. 이 네 가지 서양 사조와 운동들이 사중복음 형성에 영향을 끼쳤음은 분명하지만, 다른 중요한 요소들도 있는데 밴 더 월은 간과한 것 같다. 심프슨은 불교, 유교, 이슬람교, 특히 불교와 불교적 요소들이 교회 내부에 침투하는 것을 경계했으며, 그에 대항하여 복음을 변증하려 했고, 아시아선교, 특히 중국선교에 몰입했다. 이런 상황과 필요 때문에 심프슨은 당시 사조들을 종합하고 재해석하여 사중복음을 탄생시킨 것이다. 이 논문은 밴 더 월이 분석한 서양 사조들이 사중복음 탄생에 기여했음을 전제로 하되, 그가 간과한 다른 부분, 즉, 서양에 밀려온 아시아사상에 대항하여 심프슨이 복음을 변증하고자 한 것과 아시아선교, 특시 중국 선교 열망을 가진 것도 사중복음 형성에 기여했음을 드러내고자 한다. 심프슨과 사중복음은 19세기 말부터 20세기 초까지 서구 복음주의 진영에서 교파를 초월하여 주목을 받았고, 현재까지 오순절 및 복음주의 계통 교회들에 꾸준한 영향을 끼치고 있으며, 동북아 주요 3국과 인도차이나반도에 지속적인 영향을 끼치고 있다. 그럼에도 불구하고, 그에 대한 선행연구는 주로 심프슨의 삶과 글과 그가 설립한 “기독교연합선교회”(Christian and Missionary Alliance, 이후 “C&MA”)를 소개하는 정도에 머물렀다. 심프슨이 사역 후반기에 중국 사상과 언어를 공부하고 중국 선교를 독려하는 데 몰입했다는 사실과 그 배후 사상에 관한 연구는 상대적으로 미흡했다.

한국 기독교 선교의 기원에 관해 관심을 갖고 있는 몇몇 개신교 단체들은 최근 올해 2014년을 한국기독교 130주년으로 정하고, 이를 기념하려고 노력하고 있다. 그러나 이러한 중대한 역사적 사건을 기념하기 전에, 우리는 1) 용어 사용의 문제, 2) 역사관의 중요성, 그리고 3) 첫 번째 선교사에 대한 논쟁 등과 같은 문제들을 주의 깊게 연구해 보아야 한다. 가장먼저 우리는 ‘기독교(Christianity)’의 의미를 고려한 후, 우리가 사용하는 용어가 과연 적절한가를 살펴보아야 한다. 일반적으로 기독교란 ‘예수를 그리스도로 믿는 사람들의 모임이나 그 상태’를 의미한다. 그래서 기독교는 로마 카톨릭 교회, 동방정교회, 성공회, 그리고 개신교회를 모두 다 포함하는 매우 포괄적인 용어이다. 만일 한국에서 가장먼저 선교역사가 시작된 천주교의 역사의 시작점인 1784년을 한국기독교의 시작점으로 본다면, 올해는 한국기독교 130주년이 아니라 230주년이 되어야 할 것이다. 그러므로 만일 올해 2014년도를 한국 기독교 전체가 아닌 개신교 차원에서만 기념하려 한다면, ‘한국기독교 130주년’이 아닌, ‘한국개신교 130주년’이라는 슬로건을 사용해야 할 것이다. 또한 우리들은 역사를 이해함에 있어서 역사관의 중요성에 관해서 반드시 인지해야 한다. 일반적으로 말해서, 한국에서는 한국교회사 혹은 한국선교역사를 연구함에 있어서 크게 ‘선교사 중심의 역사이해’와 ‘한국인 중심의 역사이해’라는 두 개의 역사관이 존재한다고 볼 수 있다. 한국인 중심의 역사이해를 하려는 사람들은 1884년 이전에 주로 중국이나 일본에서 초기 선교사들과의 만남을 통해 개신교 신앙을 접한 초기 한국인들(예를들어, 백홍준의 아버지, 이응찬, 김진기, 서상륜, 서경조, 이수정)에게 관심을 많이 갖고 있다. 물론 이들 한국인들은 한국 개신교 신앙의 개척자들로서 한국개신교 선교를 위해 다방면에서 공헌을 한 점은 인정한다. 그러나 그들이 진정한 기독교인 이었는지, 그리고 한국에 교회를 설립한 것이 맞는지는 의심의 여지가 있다. 바로 이런 점들 때문에 어떤 이들은 한국개신교 역사의 시작은 외국 선교사들의 한국입국과 깊은 관련이 있다고 생각한다. 그러나 한국에 온 첫 번째 개신교 선교사가 누구인가에 관해서는 여전히 논쟁점들이 존재한다. 찰스 귀츨라프는 1832년에 그리고 로버트 토마스는 1866년에 한국에 처음 도착한 것은 역사적으로 분명한 사실이다. 그럼에도 불구하고 이들이 과연 진정한 선교사였는가에 대해서는 명확한 입장이 아직 정리되지 않았다. 왜냐하면 그들이 한국에 올 때, 서구 제국주의 혹은 식민주의자들과 함께, 그리고 그들의 조력자로 한국에 왔기 때문이다. 바로 이런 이유 때문에 한국 교회사학계와 교회들에서는 1880년대에 한국에 온 선교사들 가운데에서 그 첫번째 선교사를 찾으려고 한다. 한국감리교의 초대 총리사였던 양주삼은 1880년대 한국에 온 선교사들 중에 로버트 매클레이를 첫 번째 개신교선교사로 보고 있다. 왜냐하면 매클레이가 1884년에 고종으로부터 감리교를 포함한 모든 개신교 선교사들의 선교(의료, 교육)에 관해 공식적으로 허락을 받았기 때문이다. 특히 매클레이가 보여준 한국정부와 한국 사람들을 대하는 정중한 태도는 오늘날 한국 개신교회들에게 매우 긍정적인 교훈을 주기 때문에, 우리는 매클레이를 한국에 온 첫 번째 개신교 선교사라고 고려할 수 있다고 생각한다.

In this paper, a brief but essential development strategy for the lunar orbit determination system is discussed to prepare for the future Korea’s lunar missions. Prior to the discussion of this preliminary development strategy, technical models of foreign agencies for the lunar orbit determination system, tracking networks to measure the orbit, and collaborative efforts to verify system performance are reviewed in detail with a short summary of their lunar mission history. Covered foreign agencies are European Space Agency, Japan Aerospace Exploration Agency, Indian Space Research Organization and China National Space Administration. Based on the lessons from their experiences, the preliminary development strategy for Korea’s future lunar orbit determination system is discussed with regard to the core technical issues of dynamic modeling, numerical integration, measurement modeling, estimation method, measurement system as well as appropriate data formatting for the interoperability among foreign agencies. Although only the preliminary development strategy has been discussed through this work, the proposed strategy will aid the Korean astronautical society while on the development phase of the future Korea’s own lunar orbit determination system. Also, it is expected that further detailed system requirements or technical development strategies could be designed or established based on the current discussions.

The communications link in a space program is a crucial point for upgrading its performance by handling data between spacecraft bus and payloads, because spacecraft’s missions are related to the data handling mechanism using communications ports such as a controlled area network bus (CAN Bus) and a universal asynchronous receiver and transmitter (UART). The NEXTSat-1 has a lot of communications ports for performing science and technology missions. However, the top level system requirements for the NEXTSat-1 are mass and volume limitations. Normally, the communications for units shall be conducted by using point to point link which require more mass and volume to interconnect. Thus, our approach for the novel communications link in the NEXTSat-1 program is to use CAN and serializer and deserializer low voltage differential signal (SerDesLVDS) to meet the system requirements of mass and volume. The CAN Bus and SerDesLVDS were confirmed by using already defined communications link for our missions in the NEXTSat-1 program and the analysis results were reported in this study in view of data flow and size analysis.

The next generation small satellite-1 (NEXTSat-1) program has been kicked off in 2012, and it will be launched in 2016 for the science missions and the verification of space core technologies. The payloads for these science missions are the Instrument for the Study of Space Storms (ISSS) and NIR Imaging Spectrometer for Star formation history (NISS). The ISSS and the NISS have been developed by Korea Advanced Institute of Science and Technology (KAIST) and Korea Astronomy and Space science Institute (KASI) respectively. The ISSS detects plasma densities and particle fluxes of 10 MeV energy range near the Earth and the NISS uses spectrometer. In order to verify the spacecraft core technologies in the space, the total of 7 space core technologies (SCT) will be applied to the NEXTSat-1 for space verification and those are under development. Thus, the operation modes for the ISSS and the NISS for space science missions and 7 SCTs for technology missions are analyzed for the required operation time during the NEXTSat-1’s mission life time of 2 years. In this paper, the operational concept of the NEXTSat-1’s science missions as well as the verification of space core technologies are presented considering constraints of volume, mass, and power after launch.

TRiplet Ionospheric Observatory-CubeSat for Ion, Neutron, Electron & MAgnetic fields (TRIO-CINEMA) is a CubeSat with 3.14 kg in weight and 3-U (10 × 10 × 30 cm) in size, jointly developed by Kyung Hee University and UC Berkeley to measure magnetic fields of near Earth space and detect plasma particles. When a satellite is launched into orbit, it encounters ultrahighvacuum and extreme temperature. To verify the operation and survivability of the satellite in such an extreme space environment, experimental tests are conducted on the ground using thermal vacuum chamber. This paper describes the temperature control device and monitoring system suitable for CubeSat test environment using the thermal vacuum chamber of the School of Space Research, Kyung Hee University. To build the chamber, we use a general purpose thermal analysis program and NX 6.0 TMG program. We carry out thermal vacuum tests on the two flight models developed by Kyung Hee University based on the thermal model of the TRIO-CINEMA satellite. It is expected from this experiment that proper operation of the satellite in the space environment will be achieved.

In this research, the ground contact opportunity for the fictitious low lunar orbiter is analyzed to prepare for a future Korean lunar orbiter mission. The ground contact opportunity is basically derived from geometrical relations between the typical ground stations at the Earth, the relative positions of the Earth and Moon, and finally, the lunar orbiter itself. Both the cut-off angle and the orbiter’s Line of Sight (LOS) conditions (weather orbiter is located at near or far side of the Moon seen from the Earth) are considered to determine the ground contact opportunities. Four KOMPSAT Ground Stations (KGSs) are assumed to be Korea’s future Near Earth Networks (NENs) to support lunar missions, and world-wide separated Deep Space Networks (DSNs) are also included during the contact availability analysis. As a result, it is concluded that about 138 times of contact will be made between the orbiter and the Daejeon station during 27.3 days of prediction time span. If these contact times are converted into contact duration, the duration is found to be about 8.55 days, about 31.31% of 27.3 days. It is discovered that selected four KGSs cannot provide continuous tracking of the lunar orbiter, meaning that international collaboration is necessary to track Korea’s future lunar orbiter effectively. Possible combinations of world-wide separated DSNs are also suggested to compensate for the lack of contact availability with only four KGSs, as with primary and backup station concepts. The provided algorithm can be easily modified to support any type of orbit around the Moon, and therefore, the presented results could aid further progress in the design field of Korea’s lunar orbiter missions.

It is well-known that the Rev. Kyung-Chik Han was very active in world mission. Interestingly, however, there has been few, if not any, studies on his ministry of world mission. This study reviews his ministry of world mission, summarizing it into several patterns, clarifying its main issues, and evaluating its historical legacy. His ministry of world mission can be divided into several patterns, which is closely related to the development of his pastoral ministry. The patterns are as follows: first, the period of pasturing a migrant church (1945-1950); second, that of representing the Korean Church to the world churches (1950-1955); third, that of participating in ecumenical mission (1955-1966); and last, that of participating in evangelical mission (1966-2000). We may recapitulate the Rev. Han’s ministry of world mission as follows. To begin with, let us examine his strong points: first, with the idea of evangelism being the core, he expanded his ministry, starting from national evangelization to world mission; second, he carried out both gospel ministry and relief ministry; third, he greatly contributed to the mobilization of the Youngrak Presbyterian Church and its daughter churches for world mission; fourth, he enhanced the church’s awareness about the world churches, and thus let it naturally accept the challenge of world mission. However, it is necessary to point out his weaknesses: first, his framework of the two-faced ministry, gospel and relief, gradually became behind the times, as he failed to respond to the new ideas of world mission; second, his role in introducing the ideas of ecumenical mission to the Korean Church was limited; third, thus the Korean Church in general, including him, remained under the influence of the viewpoint of traditional mission; fourth, owing to his close relationship with the evangelicals, his leadership was gradually confined to the evangelical camp. In conclusion, it can be safely said that he was a missionary activist rather than missionary thinker, and that he contributed to the mobilization for mission rather than the vitalization of missiology.

Triplet Ionospheric Observatory (TRIO) CubeSatforIon, Neutral, Electron MAgneticfields (CINEMA) is a CubeSat with the weight 3 kg that will be operated in the orbit conditions of about 800 km altitude and 90° inclination angle, using the S-band and ultra-high frequency (UHF)-band communication frequencies. Regarding the communication antenna loaded on the satellite, the two patch antennas has the downlink function in the S-band, whereas the two whip antennas has the function to receive the command sent by the ground station to the satellite in the UHF-band. The uplink ground station that communicates through the UHF-band with the CINEMA satellite was established at Kyung Hee University. The system is mainly composed of a terminal node controller, a transceiver, and a helical antenna. The gain of the helical antenna established at the Kyung Hee University ground station was 9.8 dBi. The output of the transceiver was set to be 5 W (6.9 dB) for the communication test. Through the far-field test of the established system, it was verified that the Roman characters, figures and symbols were converted into packets and transmitted to the satellite receiver in the communica\-tion speed of 9,600 bps.

Thermal analysis and control design are prerequisite essential to design the satellite. In the space environment, it makes satellite survive from extreme hot and cold conditions. In recent years CubeSat mission is developed for many kinds of purpose. Triplet Ionospheric Observatory (TRIO)–CubeSat for Ion, Neutral, Electron, MAgnetic fields (CINEMA) is required to weigh less than 3 kg and operate on minimal 3 W power. In this paper we describe the thermal analysis and control design for TRIO-CINEMA mission. For this thermal analysis, we made a thermal model of the CubeSat with finite element method and NX6.0 TMG software is used to simulate this analysis model. Based on this result, passive thermal control method has been applied to thermal design of CINEMA. In order to get the better conduction between solar panel and chassis, we choose aluminum 6061-T6 for the material property of standoff. We can increase the average tempera\-ture of top and bottom solar panels from -70°C to -40°C and decrease the average temperature of the magnetometer from +93°C to -4°C using black paint on the surface of the chassis, inside of top & bottom solar panels, and magnetometer.

The relationship between mission and imperialism has been one of the central themes which recur throughout missiology, in particular, mission history. In the case of the Korean Church, this theme also has particular significance for church history in that it was related to the origin of the Korean Church, especially the Korean Protestant Church. This study attempts to examine this theme, with special reference to the World Missionary Conference in Edinburgh, 1910. It is because, first, the Korean Church was established in the context of imperialism; second, in Korea did arise an irregular case of the relationship between mission and imperialism, namely, western mission versus non-western imperialism rathallthan normal one, namely, western mission versus western imperialism; and third, the abovementioned Edinburgh Conference was held at the peak period of imperialism, from the late nineteenth century to the early twentieth century. Since the last year was the centennial of the Edinburgh Conference, the Conference was almost thoroughly investigated. In this context, it may also be well worth exploring the Conference from the perspective of the relationship between mission and imperialism. In particular, this study tries to grasp the reality of the Korean Church at the period under consideration, through unearthing archival material, that is, the draft reports to the Commissions of the Edinburgh Conference, which have rarely been utilized in the hitherto studies. In conclusion, this study makes it clear that the western mission, including the western mission working in the non-western imperial context, in the pre-World War Ⅱ period was largely under the influence of the ideology of imperialism, although mission could not totally identify with imperialism. It is against this backdrop that arises a question of whether the end of imperialism means the end of mission. This is why the post-colonial period exacts a new paradigm of mission.

This paper describes the Flight Dynamics Automation (FDA) system for COMS Flight Dynamics System (FDS) and its test result in terms of the performance of the automation jobs. FDA controls the flight dynamics functions such as orbit determination, orbit prediction, event prediction, and fuel accounting. The designed FDA is independent from the specific characteristics which are defined by spacecraft manufacturer or specific satellite missions. Therefore, FDA could easily links its autonomous job control functions to any satellite mission control system with some interface modification. By adding autonomous system along with flight dynamics system, it decreases the operator’s tedious and repeated jobs but increase the usability and reliability of the system. Therefore, FDA is used to improve the completeness of whole mission control system’s quality. The FDA is applied to the real flight dynamics system of a geostationary satellite, COMS and the experimental test is performed. The experimental result shows the stability and reliability of the mission control operations through the automatic job control.

Horace N. Allen, a missionary, established the first Western hospital in Korea, Je Jung Won, when he arrived at Jo Sun in September 1884. He also opened the first medical school to teach Western medicine. The hospital and medical education was developed rapidly by Oliver R. Avison. In the history of Severance Medical Center, Avison’s greatness can be found in three aspects. Firstly, he served the Korean people by his medical work throughout his life. Secondly, he developed an autonomous system for handing down Western medicine to Korean people, ensuring the continuation of his medical work to Korean people. Thirdly, he prepared and educated the Korean people in Western medicine without any pause or reservation for himself. Of these three, the third is the most distinctive achievement of Avison. He regarded the Koreans as the initiater of the medicine in Korea, not as child-like objects for education as other missionaries generally viewed them. It was because he was free from the confining racial prejudice of considering the Korean people as the inferiors to be pitied. Then what was the power in Avison’s faith that distinguished him from others? It was his understanding that the essence of faith was the power of the Christian passion that deeply sympathizes with the sick, the weak, and the alienated, as their own suffering, and lovingly serving neighbors to improve their lives as humans. He also had the political and religious convictions of democracy, that everyone was equal as the children of God. Cultivating the Severance Medical Center into a large tree was not the blind desire of efficacy and profit, which is the general perception. Paradoxically, it has grown through the power of non-profitable, loving commitment and serving. This is the very reason to pursue the spirit of the Severance Medical Center and to faithfully adhere to its historical tradition. Even today, Jesus Christ is calling us to the Word of the truth that human beings can not live by bread alone.